An injection mold that is easy to demould

Abstract

The present invention provides an injection mold that is easy to demold, belonging to the technical field of injection molds. The invention comprises a fixed mold base, a movable mold base and a mounting plate installed at the bottom of the fixed mold base, and also comprises: a gradient cooling component and a magnetic sealing component; the mold creates a stepped cooling environment at the fixed mold core and the movable mold core by integrating the gradient cooling component and the magnetic sealing component, thereby meeting the cooling requirements of different parts of the injection molded parts and improving the quality of the injection molded parts; when the mold is not closed, the ball plug tightly seals the liquid guide tube, effectively preventing the entry of dust or water vapor from the outside, and at the same time helping to create a stepped cooling environment; the magnetic sealing component can realize dynamic sealing between the liquid guide tube and the liquid guide port during the process of mold closing and separation, and when the mold is closed, it prevents the coolant from flowing through the gap; when the mold is separated, the airbag gradually deflates and returns to an unsaturated state, which is convenient for the withdrawal of the liquid guide tube, while reducing the friction and the wear of the airbag.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to an injection mold which is easy to demould. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of the injection molding method are fast production speed, high efficiency, automated operation, a wide variety of colors, shapes from simple to complex, sizes from large to small, and precise product size. The product is easy to update and can be made into parts with complex shapes. Injection molding is suitable for mass production and molding processing fields such as products with complex shapes. At a certain temperature, the completely molten plastic material is stirred by a screw, injected into the mold cavity with high pressure, and cooled and solidified to obtain a molded product. This method is suitable for mass production of parts with complex shapes and is one of the important processing methods.

[0003] After searching, it was found that most of the existing injection molds realize cooling and shaping of injection molded parts by setting cooling pipes on the fixed mold base and the movable mold base. However, due to the complex shapes of injection molded parts and the different contact points with the mold base, the cooling requirements vary significantly. It is difficult to achieve precise temperature control of each contact point using traditional methods, resulting in uneven cooling. In order to meet the cooling needs of different parts, it is often necessary to design complex cooling circuits inside the mold, which not only increases the design and manufacturing costs of the mold, but also increases the difficulty of system maintenance. In addition, complex cooling systems require more energy to maintain their operation, resulting in increased energy consumption. At the same time, due to uneven cooling, longer cooling times may be required, further increasing energy consumption.

[0004] How to invent an injection mold that is easy to demould to solve these problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides an injection mold that is easy to demould, aiming to solve the problems mentioned in the above background.

[0006] The present invention is achieved in that:

[0007] The present invention provides an injection mold for easy demoulding, comprising a fixed mold seat, a movable mold seat and a mounting plate mounted at the bottom of the fixed mold seat, the injection mold is mounted on an injection molding machine, a fixed mold core is mounted on the upper surface of the fixed mold seat, a movable mold core is mounted on the lower surface of the movable mold seat, a top plate and a push rod are arranged on the top of the movable mold seat, the push rod passes through the side wall of the top plate and an ejection mechanism is fixedly connected at its end, a guide rod is installed between the movable mold seat and the top plate, the ejection mechanism is slidably sleeved on the guide rod, the fixed mold seat and the movable mold seat are selectively matched, the fixed mold core and the movable mold core are matched to form a cavity for injection molding an injection molded part, a pouring seat is installed at the bottom of the mounting plate, the end of the pouring seat extends to the middle water outlet of the cavity, a pouring channel is arranged inside the pouring seat, and further comprises:

[0008] Gradient cooling assembly: The gradient cooling assembly is arranged on the fixed mold base and the movable mold base, and the gradient cooling assembly is used to provide different degrees of cooling for the fixed mold base and the movable mold base;

[0009] Magnetic sealing assembly: The magnetic sealing assembly is arranged on one side where the fixed mold seat and the movable mold seat are combined. The magnetic sealing assembly is used to provide sealing for the gradient cooling assembly when the fixed mold seat and the movable mold seat are combined.

[0010] Preferably, the ejection mechanism is composed of a mounting seat and a plurality of ejector pins, and the movable mold core and the movable mold seat are provided with through holes that cooperate with the ejector pins, and the injection molded part is ejected by the ejector pins after molding.

[0011] Preferably, the top of the mounting seat is fixedly connected to the bottom end of the push rod, and the top of the ejector pin is fixed inside the mounting seat.

[0012] Preferably, the gradient cooling assembly includes multiple groups of secondary cooling pipelines and primary cooling pipelines, the primary cooling pipelines are located on the fixed mold base and arranged around the fixed mold core, the secondary cooling pipelines are arranged around the top of the movable mold core, the multiple groups of secondary cooling pipelines are connected through a liquid guide cavity, and the multiple groups of primary cooling pipelines are connected through a connecting cavity.

[0013] Preferably, a plurality of liquid guide tubes are fixedly connected to the bottom of the movable mold seat corresponding to the liquid guide cavity, a guide channel cooperating with the liquid guide tube is provided through the movable mold seat, the upper end of the guide channel is connected with the liquid guide cavity, a liquid guide port cooperating with the liquid guide tube is provided through the top of the fixed mold seat corresponding to the connecting cavity, and the lower end of the liquid guide port is connected with the connecting cavity.

[0014] Preferably, a liquid inlet pipe is provided on the circumferential side of the primary cooling pipeline, and a liquid discharge pipe is provided on the circumferential side of the secondary cooling pipeline. The ends of the liquid discharge pipe and the liquid inlet pipe are both connected to control valves. The control valve at the end of the liquid discharge pipe is connected to an external coolant injection pipeline, and the control valve at the end of the liquid inlet pipe is connected to an external circulation pipeline.

[0015] Preferably, a connecting magnetic plate is installed at the end of the liquid guide tube away from the movable mold seat, and a limiting hole is set through the connecting magnetic plate. A porous plate is installed at the end of the diversion channel close to the liquid guide cavity, and a first spring is fixedly connected to the side wall of the porous plate facing the liquid guide tube, and a ball plug is fixedly connected to the end of the first spring.

[0016] Preferably, the end of the ball plug in the initial state abuts against the end of the limiting hole, and a cut-off port is symmetrically arranged on the ball plug facing the connected magnetic plate. The cut-off port is located on the inner side of the limiting hole and does not penetrate the side wall of the ball plug, and the diameter of the ball plug is smaller than the inner diameter of the catheter.

[0017] Preferably, the magnetic sealing assembly includes an air storage chamber and an air bag, the air storage chamber is arranged around the liquid guide port, the top of the air storage chamber is fixedly connected to a second spring, the lower end of the second spring is fixedly connected to a magnetic ring, the magnetic ring is slidably sleeved inside the air storage chamber, the air storage chamber located at the bottom of the magnetic ring is filled with an inert gas, the air bag is fixedly arranged on the inner side of the liquid guide port, an air guide tube is arranged on the lower side wall of the air storage chamber, the end of the air guide tube is connected to the inner cavity of the air bag, and the air storage chamber is connected to the air bag through the air guide tube.

[0018] Preferably, the air storage chamber, magnetic ring and airbag are all annularly arranged, the magnetic ring is sealed and connected to the air storage chamber, the side of the connecting magnetic plate opposite to the magnetic ring is magnetically arranged with different polarities, the magnetic force between the connecting magnetic plate and the magnetic ring when the two are opposite to each other is greater than the elastic force of the second spring, the magnetic ring is in the middle of the air storage chamber and the airbag is in an unsaturated state in the initial state, and the magnetic ring is at the bottom of the air storage chamber and the airbag is in a saturated state when the fixed mold seat and the movable mold seat are combined.

[0019] The beneficial effects of the present invention are:

[0020] 1. The gradient cooling component creates a stepped cooling environment at the fixed mold core and the movable mold core by controlling the flow path of the coolant. The fixed mold core is first cooled by the coolant with a lower temperature, and then the movable mold core is cooled by the coolant with a slightly higher temperature. This meets the cooling needs of different parts of the injection molded parts and improves the cooling uniformity. This design helps to improve the dimensional stability and surface quality of the injection molded parts, while shortening the cooling time and improving production efficiency.

[0021] 2. When the mold is not closed, the ball plug in the magnetic sealing assembly tightly closes the liquid guide tube under the action of the first spring, effectively preventing the entry of dust or water vapor from the outside, which keeps the cooling system clean and dry, avoids system failure or performance degradation caused by impurity contamination, and can also extend the flow time of the coolant in the primary cooling pipeline, ensuring that there is a significant temperature difference between the coolant entering the secondary cooling pipeline and the coolant just entering the primary cooling pipeline; the interception port design on the ball plug increases the force area, making the ball plug easier to be pushed and moved when subjected to the coolant pressure, while also preventing external water vapor and dust from entering the liquid guide tube through the interception port; the turbulence and mixing of the coolant when passing through the limit hole and the gap between the ball plug and the liquid guide tube increase the heat dissipation area and heat dissipation efficiency of the coolant.

[0022] 3. The magnetic sealing component can realize dynamic sealing between the liquid guide tube and the liquid guide port during the mold closing and separation process. When the mold is closed, the airbag is tightly wrapped around the liquid guide tube to form a seal, preventing the coolant from flowing through the gap; when the mold is separated, the airbag gradually deflates and returns to an unsaturated state, which is convenient for the withdrawal of the liquid guide tube, while reducing friction and the wear of the airbag.

[0023] In summary, this type of mold achieves targeted and efficient cooling of the injection molded parts at the moving core and fixed core of the injection mold by integrating the gradient cooling component and the magnetic sealing component, and ensures the stability and reliability of the cooling system. This design not only improves the quality and production efficiency of the injection molded parts, but also reduces energy consumption and environmental pollution, providing a more reliable solution for the cooling of the injection mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of an injection mold that is easy to demould provided by an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the installation position structure of a casting seat of an injection mold that is easy to demould provided by an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of a fixed mold core and a mold cavity structure of an injection mold that is easy to demould provided by an embodiment of the present invention;

[0028] Figure 4It is a schematic diagram of a movable mold core and a liquid guide tube structure of an injection mold that is easy to demould provided by an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of an injection mold with an ejector pin lifted up for easy demoulding provided by an embodiment of the present invention;

[0030] Figure 6 It is a schematic cross-sectional structure diagram of a movable mold seat of an injection mold that is easy to demould provided by an embodiment of the present invention;

[0031] Figure 7 It is a schematic cross-sectional structure diagram of a fixed mold base of an injection mold that is easy to demould provided by an embodiment of the present invention;

[0032] Figure 8 1 is a schematic diagram of a front cross-sectional structure of an injection mold that is easy to demould, provided in an embodiment of the present invention;

[0033] Fig. 9 An injection mold that is easy to demould is provided in an embodiment of the present invention Figure 8 The enlarged structural diagram at A in the middle;

[0034] Fig.10 It is a schematic diagram of a front cross-sectional structure of a fixed mold base of an injection mold that is easy to demould provided by an embodiment of the present invention;

[0035] Fig.11 An injection mold that is easy to demould is provided in an embodiment of the present invention Fig.10 The enlarged structural diagram at B in the middle;

[0036] Fig.12 It is a schematic diagram of a front cross-sectional structure of a movable mold base of an injection mold that is easy to demould provided by an embodiment of the present invention;

[0037] Fig.13 An injection mold that is easy to demould is provided in an embodiment of the present invention Fig.12 Enlarged structural diagram at point C in the middle.

[0038] In the figure: 1. fixed mold base; 2. movable mold base; 3. liquid guide port; 4. movable mold core; 5. liquid guide pipe; 6. liquid guide cavity; 7. primary cooling pipeline; 8. air storage cavity; 9. air guide pipe; 11. mounting plate; 12. pouring seat; 13. fixed mold core; 14. cavity; 21. top plate; 22. push rod; 23. ejection mechanism; 24. guide rod; 51. connecting magnetic plate; 52. limiting hole; 53. porous plate; 54. first spring; 55. ball plug; 56. intercepting port; 57. guide channel; 61. secondary cooling pipeline; 62. drain pipe; 71. connecting cavity; 72. liquid inlet pipe; 81. second spring; 82. magnetic ring; 91. air bag. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1, refer to Figure 1-Figure 9 , an injection mold for easy demoulding, comprising a fixed mold base 1, a movable mold base 2 and a mounting plate 11 mounted at the bottom of the fixed mold base 1, the injection mold is mounted on an injection molding machine, a fixed mold core 13 is mounted on the upper surface of the fixed mold base 1, a movable mold core 4 is mounted on the lower surface of the movable mold base 2, a top plate 21 and a push rod 22 are arranged on the top of the movable mold base 2, the push rod 22 passes through the side wall of the top plate 21 and an ejection mechanism 23 is fixedly connected to its end, a guide rod 24 is installed between the movable mold base 2 and the top plate 21, the ejection mechanism 23 is slidably sleeved on the guide rod 24, the fixed mold base 1 and the movable mold base 2 are selectively matched, The fixed mold core 13 and the movable mold core 4 are combined to form a cavity 14 for injection molding of the injection molded part. A pouring seat 12 is installed at the bottom of the mounting plate 11. The end of the pouring seat 12 extends to the middle water outlet of the cavity 14. A pouring channel is provided inside the pouring seat 12. First, plastic particles are poured into the hopper of the injection molding machine. The plastic particles are pushed forward by the screw. At the same time, the plastic particles are also melted into plastic fluid by the heating device during the forward process. Next, the screw continues to advance and quickly squeezes the plastic fluid into the cavity 14 of the mold until the entire mold cavity 14 is filled. It also includes:

[0041] Gradient cooling assembly: The gradient cooling assembly is arranged on the fixed mold base 1 and the movable mold base 2, and the gradient cooling assembly is used to provide different degrees of cooling for the fixed mold base 1 and the movable mold base 2;

[0042] Magnetic sealing assembly: The magnetic sealing assembly is arranged on one side where the fixed mold base 1 and the movable mold base 2 are combined. The magnetic sealing assembly is used to provide sealing for the gradient cooling assembly when the fixed mold base 1 and the movable mold base 2 are combined.

[0043] Furthermore, the ejection mechanism 23 is composed of a mounting seat and a plurality of ejector pins. The movable mold core 4 and the movable mold seat 2 are provided with through holes that cooperate with the ejector pins. After the injection molded part is formed, it is ejected by the ejector pins. The top of the mounting seat is fixedly connected to the bottom end of the push rod 22, and the top of the ejector pin is fixed inside the mounting seat. The mounting seat can be moved by the push rod 22, and the ejector pin can be pushed to operate.

[0044] The gradient cooling assembly includes a plurality of groups of secondary cooling pipelines 61 and primary cooling pipelines 7. The primary cooling pipelines 7 are located on the fixed mold base 1 and are arranged around the fixed mold core 13, and are used to directional cool the injection molded part at the fixed mold core 13. The secondary cooling pipelines 61 are arranged around the top of the movable mold core 4, and are used to directional cool the injection molded part at the movable mold core 4. The plurality of groups of secondary cooling pipelines 61 are connected through the liquid guide cavity 6, and the plurality of groups of primary cooling pipelines 7 are connected through the connecting cavity 71, so as to ensure that the coolant can be evenly distributed in the secondary cooling pipelines 61 and the primary cooling pipelines 7. The bottom of the movable mold base 2 corresponding to the liquid guide cavity 6 is fixedly connected with several liquid guide tubes 5, and a guide channel 57 cooperating with the liquid guide tube 5 is provided through the movable mold base 2, and the upper end of the guide channel 57 is communicated with the liquid guide cavity 6. The top of the fixed mold base 1 corresponding to the connecting cavity 71 is provided with a liquid guide port 3 cooperating with the liquid guide tube 5, and the lower end of the liquid guide port 3 is communicated with the connecting cavity 71. Through the cooperation of the liquid guide port 3 and the liquid guide tube 5, the coolant in the connecting cavity 71 can be transported to the liquid guide cavity 6 through the guide channel 57, and then can be distributed to each secondary cooling pipeline 61.

[0045] Furthermore, a liquid inlet pipe 72 is provided on the peripheral side of the primary cooling pipeline 7, and a liquid discharge pipe 62 is provided on the peripheral side of the secondary cooling pipeline 61. The ends of the liquid discharge pipe 62 and the liquid inlet pipe 72 are both connected to control valves. The control valve at the end of the liquid discharge pipe 62 is connected to the external coolant injection pipeline. First, the coolant with a lower temperature is injected into the primary cooling pipeline 7 through the external coolant injection pipeline and the liquid inlet pipe 72, and then evenly distributed in the primary cooling pipeline 7 through the connecting cavity 71. As the coolant continues to be injected, the previously injected coolant (due to the first contact with the fixed mold base 1) is , the solid temperature is higher) will enter the liquid guiding cavity 6 through the liquid guiding port 3 and the liquid guiding tube 5, and then can be distributed to each secondary cooling pipeline 61 to realize the cooling of the movable mold core 4. Through the sequential entry of the coolant, a stepped cooling environment can be created, and the movable mold core 4 and the fixed mold core 13 can be cooled in a targeted manner (because most of the injection molded parts are inside the fixed mold core 13, the solid needs to be cooled more than the movable mold core 4). The control valve at the end of the liquid inlet pipe 72 is connected to the external circulation pipeline, and the coolant entering the secondary cooling pipeline 61 is discharged through the external circulation pipeline.

[0046] In this embodiment, the plastic raw material is melted in the injection molding machine and injected at high pressure into the cavity 14 formed by the fixed mold core 13 and the movable mold core 4. The mold maintains a certain pressure and temperature through a gradient cooling component to accelerate the cooling and solidification of the plastic raw material in the cavity 14. After the injection molding is completed, the movable template of the injection molding machine retreats, driving the movable mold base 2 to separate from the fixed mold base 1. At this time, the injection molded part in the cavity 14 has been cooled and solidified and separated from the inner wall of the fixed mold base 1. The push rod 22 moves under the push of the ejector of the injection molding machine, driving the ejection mechanism 23 to slide along the guide rod 24. The ejection mechanism 23 is composed of a mounting seat and a plurality of ejector pins. The ejector pins pass through the through holes on the movable mold core 4 and the movable mold base 2 and contact the injection molded part. As the ejection mechanism 23 slides, the ejector pins eject the injection molded part from the cavity 14. After the injection molded part is ejected, it can be conveniently taken out of the mold for subsequent processing or processing.

[0047] Here, the primary cooling pipeline 7 is located on the fixed mold base 1 and is arranged around the fixed mold core 13, and is used for directional cooling of the injection molded part at the fixed mold core 13. Since most of the injection molded parts are usually located at the fixed mold core 13, the cooling demand at the fixed mold core 13 is relatively high.

[0048] Secondary cooling pipeline 61 is arranged around the top of the movable mold core 4 and is used for directional cooling of the injection molded part at the movable mold core 4. Since only the top of the injection molded part contacts the movable mold core 4, the cooling demand at the movable mold core 4 is relatively low.

[0049] The liquid guiding cavity 6 and the connecting cavity 71 are respectively used to connect multiple groups of secondary cooling pipelines 61 and primary cooling pipelines 7 to ensure that the coolant is evenly distributed in the pipelines.

[0050] The liquid guiding tube 5 and the guiding channel 57 work together to transport the cooling liquid in the connecting cavity 71 to the liquid guiding cavity 6 , and then distribute it to each secondary cooling pipeline 61 .

[0051] The coolant entering the secondary cooling pipeline 61 is eventually discharged through the drain pipe 62 and the external circulation pipeline for recycling or treatment. The control valve at the end of the inlet pipe 72 is connected to the external circulation pipeline to ensure the continuous supply and discharge of the coolant.

[0052] By adjusting the control valve, the flow path, flow rate and temperature of the coolant can be accurately controlled to meet different cooling needs. The opening and closing of the control valve can be adjusted according to the material, shape, size of the injection molded parts and the actual situation in the production process.

[0053] It should be noted that the coolant with a lower temperature is first injected into the primary cooling pipeline 7 through the external coolant injection pipeline and the liquid inlet pipe 72, and then evenly distributed in the primary cooling pipeline 7 through the connecting cavity 71, and begins to cool the injection molded part at the fixed mold core 13. With the continuous injection of the coolant, the coolant in the previously injected primary cooling pipeline 7 (due to the first contact with the fixed mold base 1, the temperature gradually increases) will enter the liquid guide cavity 6 through the liquid guide port 3 and the liquid guide tube 5, and the coolant is distributed from the liquid guide cavity 6 to each secondary cooling pipeline 61, and begins to cool the injection molded part on the movable mold core 4.

[0054] By the sequential entry of the coolant, a stepped cooling environment is created. The fixed mold core 13 is first cooled by the coolant with a lower temperature, and then the movable mold core 4 is cooled by the coolant with a slightly higher temperature. This design can achieve targeted cooling of the movable mold core 4 and the fixed mold core 13 to meet the different cooling requirements of the injection molded parts.

[0055] In summary, the gradient cooling component achieves targeted cooling of the injection molded parts at the movable mold core 4 and the fixed mold core 13 in the injection mold through ingenious design. By controlling the flow path of the coolant, a stepped cooling environment can be created to meet the cooling needs of different parts of the injection molded parts. This design not only improves the quality and production efficiency of the injection molded parts, but also reduces energy consumption and environmental pollution.

[0056] Example 2, refer to Figure 10-13 A connecting magnetic plate 51 is installed at the end of the liquid guide tube 5 away from the movable mold base 2, and a limiting hole 52 is set through the connecting magnetic plate 51. A porous plate 53 is installed at the end of the guide channel 57 close to the liquid guide cavity 6. The porous plate 53 plays a role of positioning and flow. A first spring 54 is fixedly connected to the side wall of the porous plate 53 facing the liquid guide tube 5, and a ball plug 55 is fixedly connected to the end of the first spring 54.

[0057] It should be noted that, in the initial state, the end of the ball plug 55 abuts against the end of the limiting hole 52. At this time, under the action of the first spring 54, the ball plug 55 abuts against the limiting hole 52, and the liquid guide tube 5 is in a closed state. This arrangement has two functions. First, the liquid guide tube 5 can be in a closed state when the mold is not closed to prevent external dust or water vapor from entering. Second, it can extend the flow time of the coolant in the primary cooling pipeline 7 to ensure that the temperature of the coolant entering the secondary cooling pipeline 61 is different from that of the coolant just entering the primary cooling pipeline 7, which is convenient for creating In a stepped cooling environment, a shutoff port 56 is symmetrically arranged on the ball plug 55 connected to the magnetic plate 51. The shutoff port 56 is located on the inner side of the limiting hole 52 and does not penetrate the side wall of the ball plug 55. The setting of the shutoff port 56 can increase the liquid pressure on the ball plug 55, which facilitates the movement of the ball plug 55. The diameter of the ball plug 55 is smaller than the inner diameter of the liquid guide tube 5. When the ball plug 55 is pushed away from the limiting hole 52 by the liquid, the liquid first enters through the limiting hole 52 and then passes through the gap between the ball plug 55 and the liquid guide tube 5, and finally passes through the porous plate 53 and enters the liquid guide cavity 6.

[0058] In this embodiment, first, one end of the liquid guide tube 5 (the end away from the movable mold base 2) is equipped with a connecting magnetic plate 51, and a limiting hole 52 is designed on the connecting magnetic plate 51. The hole runs through the connecting magnetic plate 51 and is used for subsequent fluid passage control. Then, at the end of the guide channel 57 close to the liquid guide cavity 6, a porous plate 53 is installed. The porous plate 53 plays two key roles here: one is the positioning role to ensure the precise assembly between components; the other is the flow-through role, allowing the coolant to enter the liquid guide cavity 6 through the small holes thereon.

[0059] A first spring 54 is fixedly connected to the side of the porous plate 53 facing the liquid guiding tube 5, and the other end of the spring is connected to a ball plug 55. In the initial state, the end of the ball plug 55 is in close contact with the end of the limiting hole 52. Due to the elastic force of the first spring 54, the ball plug 55 tightly seals the limiting hole 52, so that the liquid guiding tube 5 is in a closed state.

[0060] Such a design has two main purposes: first, when the mold is not closed, the closed state of the liquid guide tube 5 can prevent external dust or water vapor from entering, keeping the system clean and dry; second, by extending the flow time of the coolant in the primary cooling pipeline 7, it can ensure that the temperature of the coolant entering the secondary cooling pipeline 61 is significantly different from the coolant just entering the primary cooling pipeline 7, which is crucial for creating a stepped cooling environment and helps to improve cooling efficiency and effect.

[0061] In addition, the ball plug 55 is symmetrically designed with intercepting openings 56, which are located on the inner side of the limiting hole 52 and do not penetrate the side wall of the ball plug 55. Such a design can increase the force-bearing area of ​​the ball plug 55 when it is subjected to liquid pressure, thereby making it easier to be pushed and moved, while also preventing external water vapor and dust from entering the liquid guide tube 5 through the intercepting openings 56.

[0062] It is worth noting that the diameter of the ball plug 55 is smaller than the inner diameter of the liquid guide tube 5, which means that when the ball plug 55 is pushed away from the limiting hole 52 by the coolant, the coolant will first enter through the limiting hole 52, and then flow through the gap between the ball plug 55 and the liquid guide tube 5. When the coolant passes through the limiting hole 52 and the gap between the ball plug 55 and the liquid guide tube 5, a certain amount of turbulence and mixing will occur, which helps to increase the heat dissipation area and heat dissipation efficiency of the coolant. Compared with directly flowing through the liquid guide tube 5, this design can more effectively reduce the temperature of the coolant, thereby improving the cooling efficiency, and finally enter the liquid guide cavity 6 through the small holes on the porous plate 53. Through this design, it can be ensured that the coolant always maintains a certain pressure difference and flow rate difference during the flow process, which helps to enhance the stability and reliability of the entire cooling system. At the same time, even if an abnormal situation occurs (such as a sudden increase or decrease in the coolant flow), the system can maintain a relatively stable operating state through the regulation of the ball plug 55.

[0063] When the mold is not closed, the ball plug 55 is tightly closed under the action of the first spring 54, which effectively prevents external dust or water vapor from entering the liquid guide tube 5, thereby keeping the cooling system clean and dry, and avoiding system failure or performance degradation due to impurity contamination; by extending the flow time of the coolant in the primary cooling pipeline 7, it is ensured that there is a significant temperature difference between the coolant entering the secondary cooling pipeline 61 and the coolant just entering the primary cooling pipeline 7. This temperature difference provides conditions for creating a stepped cooling environment, helps to improve the cooling efficiency and effect, and enables the mold to be cooled more evenly and quickly; the interception port 56 on the ball plug 55 is designed to increase the force-bearing area, so that the ball plug 55 is cooled when it is cooled. At the same time, the turbulence and mixing of the coolant when passing through the limit hole 52 and the gap between the ball plug 55 and the liquid guide tube 5 increase the heat dissipation area and heat dissipation efficiency of the coolant, thereby more effectively reducing the temperature of the coolant and improving the cooling efficiency; this design ensures that the coolant always maintains a certain pressure difference and flow rate difference during the flow process, which helps to enhance the stability and reliability of the entire cooling system. Even if an abnormal situation occurs (such as a sudden increase or decrease in the coolant flow), the system can maintain a relatively stable operating state through the regulating effect of the ball plug 55, avoiding system instability or failure caused by flow fluctuations, and providing a more reliable solution for the cooling of injection molds.

[0064] Example 3, refer to Figure 8-Figure 11The magnetic sealing component includes an air storage chamber 8 and an air bag 91. The air storage chamber 8 is arranged around the liquid guide port 3. The top of the air storage chamber 8 is fixedly connected to a second spring 81. The lower end of the second spring 81 is fixedly connected to a magnetic ring 82. The magnetic ring 82 is slidably sleeved inside the air storage chamber 8. The air storage chamber 8 located at the bottom of the magnetic ring 82 is filled with an inert gas. The air bag 91 is fixedly arranged on the inner side of the liquid guide port 3. The lower side wall of the air storage chamber 8 is connected to an air guide tube 9. The end of the air guide tube 9 is connected to the inner cavity of the air bag 91. The air storage chamber 8 is connected to the air bag 91 through the air guide tube 9.

[0065] It should be noted that the air storage chamber 8, the magnetic ring 82 and the air bag 91 are all annularly arranged, and the magnetic ring 82 is sealed and connected to the air storage chamber 8 to ensure that the gas does not flow through the gap. The side of the connecting magnetic plate 51 opposite to the magnetic ring 82 is set with different polarity magnetism. When the connecting magnetic plate 51 and the magnetic ring 82 are opposite to each other, the magnetic force between the two is greater than the elastic force of the second spring 81. During the mold closing process, the liquid guide tube 5 will gradually slide in the liquid guide port 3. When the connecting magnetic plate 51 moves to be opposite to the magnetic ring 82, at this time, driven by the magnetic force, the continued downward movement of the connecting magnetic plate 51 will drive the magnetic ring 82 to move downward synchronously (the second spring 81 is in a stretched state), and the gas at the bottom of the magnetic ring 82 will be gradually squeezed into the air bag 91 through the air guide tube 9, so that it will gradually In the initial state, the magnetic ring 82 is in the middle of the air storage chamber 8 and the air bag 91 is in an unsaturated state, which is convenient for the insertion of the liquid guide tube 5. When the fixed mold base 1 and the movable mold base 2 are combined, the magnetic ring 82 is at the bottom of the air storage chamber 8 and the air bag 91 is in a saturated state. At this time, the gas in the air storage chamber 8 is squeezed into the air bag 91, causing the air bag 91 to swell and adhere to the outer wall of the liquid guide tube 5, which avoids the risk of coolant flowing through the gap between the liquid guide tube 5 and the liquid guide port 3. When the fixed mold base 1 and the movable mold base 2 are separated, as the liquid guide tube 5 is gradually withdrawn, under the joint action of the magnetic force and the elastic force of the second spring 81, the magnetic ring 82 will gradually return to its initial state, ensuring that the liquid guide tube 5 can be smoothly detached and reducing the wear of the air bag 91.

[0066] In this embodiment, the initial state is: before the mold is closed, the magnetic ring 82 is located in the middle of the air storage chamber 8 under the action of the second spring 81. At this time, the airbag 91 is in an unsaturated state, and the amount of gas inside is small, which is convenient for the insertion of the catheter 5.

[0067] Insertion of the liquid guide tube 5: As the movable mold base 2 moves toward the fixed mold base 1, the liquid guide tube 5 is gradually inserted into the liquid guide port 3. At this time, the connecting magnetic plate 51 (fixed on the liquid guide tube 5) also moves accordingly. When the connecting magnetic plate 51 moves to a position opposite to the magnetic ring 82, since the two are set with different polarities, a strong magnetic attraction will be generated between them. This magnetic force is greater than the elastic force of the second spring 81. Therefore, the continued downward movement of the connecting magnetic plate 51 will drive the magnetic ring 82 to move downward synchronously.

[0068] Gas extrusion: As the magnetic ring 82 moves downward, the inert gas (such as nitrogen, argon, etc.) at its bottom is compressed and gradually squeezed into the air bag 91 through the air guide tube 9. As a result, the air bag 91 gradually swells and clings to the outer wall of the liquid guide tube 5.

[0069] Seal formation: When the fixed mold base 1 and the movable mold base 2 are completely matched, the magnetic ring 82 has moved to the bottom of the air storage chamber 8, and the air bag 91 reaches a saturated state. At this time, the air bag 91 is tightly wrapped around the liquid guide tube 5, forming an effective sealing barrier to prevent the coolant from flowing through the gap between the liquid guide tube 5 and the liquid guide port 3.

[0070] Mold separation process: When the fixed mold base 1 and the movable mold base 2 begin to separate, the connecting magnetic plate 51 moves up with the movable mold base 2 (liquid guide tube 5). At this time, the magnetic ring 82 begins to gradually recover to its initial state under the combined action of the magnetic force and the elastic force of the second spring 81. As the magnetic ring 82 moves upward, the gas in the airbag 91 gradually flows back to the air storage chamber 8 through the air guide tube 9, so the airbag 91 gradually deflates and recovers to an unsaturated state.

[0071] Disengagement of the catheter 5: During the recovery process of the magnetic ring 82 and the airbag 91, the catheter 5 can be smoothly withdrawn from the catheter port 3. As the airbag 91 is gradually deflated, the friction between it and the catheter 5 is reduced, thereby reducing the wear of the airbag 91.

[0072] The design of the magnetic sealing assembly has strong adaptability. By adjusting the parameters of the magnetic ring 82, the second spring 81 and the airbag 91, it can adapt to catheters 5 of different diameters and lengths and different mold structures.

[0073] In summary, the magnetic sealing assembly can achieve dynamic sealing between the liquid guide tube 5 and the liquid guide port 3 during the mold closing and separation process. When the mold is closed, the airbag 91 is tightly wrapped around the liquid guide tube 5 to form a seal; when the mold is separated, the airbag 91 is gradually deflated and restored to an unsaturated state, which is convenient for the withdrawal of the liquid guide tube 5; the bulging and close-fitting effect of the airbag 91 effectively avoids the risk of coolant flowing through the gap between the liquid guide tube 5 and the liquid guide port 3, which helps to improve the stability and reliability of the cooling system; during the mold separation process, the gradual deflation of the airbag 91 reduces the friction between it and the liquid guide tube 5, thereby reducing the wear of the airbag 91, which helps to extend the service life of the magnetic sealing assembly.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An injection mold for easy demoulding, comprising a fixed mold base (1), a movable mold base (2) and a mounting plate (11) mounted at the bottom of the fixed mold base (1), the injection mold being mounted on an injection molding machine, a fixed mold core (13) being mounted on the upper surface of the fixed mold base (1), a movable mold core (4) being mounted on the lower surface of the movable mold base (2), a top plate (21) and a push rod (22) being arranged on the top of the movable mold base (2), the push rod (22) penetrating the side wall of the top plate (21) and having an ejection mechanism (23) fixedly connected to its end, the movable mold base ( 2) and a top plate (21) are provided with a guide rod (24), the ejection mechanism (23) is slidably sleeved on the guide rod (24), the fixed mold base (1) and the movable mold base (2) are selectively matched, the fixed mold core (13) and the movable mold core (4) are matched to form a cavity (14) for injection molding an injection molded part, a pouring seat (12) is installed at the bottom of the mounting plate (11), the end of the pouring seat (12) extends to the middle water outlet of the cavity (14), and a pouring channel is provided inside the pouring seat (12), characterized in that: Also includes: Gradient cooling component: the gradient cooling component is arranged on the fixed mold base (1) and the movable mold base (2); The gradient cooling assembly comprises a plurality of groups of secondary cooling pipelines (61) and primary cooling pipelines (7), wherein the primary cooling pipelines (7) are located on the fixed mold base (1) and are arranged around the fixed mold core (13), and the secondary cooling pipelines (61) are arranged around the top of the movable mold core (4), and the plurality of groups of the secondary cooling pipelines (61) are connected through a liquid guide cavity (6), and the plurality of groups of the primary cooling pipelines (7) are connected through a connecting cavity (71); A plurality of liquid guide tubes (5) are fixedly connected to the bottom of the movable mold base (2) corresponding to the liquid guide cavity (6); a guide channel (57) cooperating with the liquid guide tube (5) is provided through the movable mold base (2); the upper end of the guide channel (57) is communicated with the liquid guide cavity (6); a liquid guide port (3) cooperating with the liquid guide tube (5) is provided through the top of the fixed mold base (1) corresponding to the connecting cavity (71); the lower end of the liquid guide port (3) is communicated with the connecting cavity (71); A connecting magnetic plate (51) is installed at the end of the liquid guide tube (5) away from the movable mold base (2), and a limiting hole (52) is provided through the connecting magnetic plate (51). A porous plate (53) is installed at the end of the flow guide channel (57) close to the liquid guide cavity (6), and a first spring (54) is fixedly connected to the side wall of the porous plate (53) facing the liquid guide tube (5), and a ball plug (55) is fixedly connected to the end of the first spring (54); In the initial state, the end of the ball plug (55) abuts against the end of the limiting hole (52); a cut-off opening (56) is symmetrically arranged on the ball plug (55) facing the magnetic plate (51); the cut-off opening (56) is located on the inner side of the limiting hole (52) and does not penetrate the side wall of the ball plug (55); and the diameter of the ball plug (55) is smaller than the inner diameter of the liquid guiding tube (5); Magnetic sealing component: the magnetic sealing component is arranged on one side where the fixed mold base (1) and the movable mold base (2) meet; The magnetic sealing assembly comprises an air storage cavity (8) and an air bag (91); the air storage cavity (8) is arranged around the liquid guide port (3); a second spring (81) is fixedly connected to the top of the air storage cavity (8); a magnetic ring (82) is fixedly connected to the lower end of the second spring (81); the magnetic ring (82) is slidably sleeved inside the air storage cavity (8); the air storage cavity (8) located at the bottom of the magnetic ring (82) is filled with an inert gas; the air bag (91) is fixedly arranged on the inner side of the liquid guide port (3); an air guide tube (9) is arranged in communication with the lower side wall of the air storage cavity (8); an end of the air guide tube (9) is connected to the inner cavity of the air bag (91); and the air storage cavity (8) is connected to the air bag (91) via the air guide tube (9).

2. The injection mold for easy demoulding according to claim 1, characterized in that: The ejection mechanism (23) is composed of a mounting seat and a plurality of ejector pins. Through holes cooperating with the ejector pins are provided on the movable mold core (4) and the movable mold seat (2). After the injection molded part is molded, it is ejected by the ejector pins.

3. The injection mold for easy demoulding according to claim 2, characterized in that: The top of the mounting seat is fixedly connected to the bottom end of the push rod (22), and the top of the ejector pin is fixed inside the mounting seat.

4. The injection mold for easy demoulding according to claim 1, characterized in that: The primary cooling pipeline (7) is connected to a liquid inlet pipe (72) on its circumferential side, and the secondary cooling pipeline (61) is connected to a liquid discharge pipe (62) on its circumferential side. The ends of the liquid discharge pipe (62) and the liquid inlet pipe (72) are both connected to control valves. The control valve at the end of the liquid discharge pipe (62) is connected to an external coolant injection pipeline, and the control valve at the end of the liquid inlet pipe (72) is connected to an external circulation pipeline.

5. The injection mold for easy demoulding according to claim 1, characterized in that: The air storage chamber (8), the magnetic ring (82) and the air bag (91) are all arranged in an annular shape. The magnetic ring (82) is sealedly connected to the air storage chamber (8). The side of the connecting magnetic plate (51) opposite to the magnetic ring (82) is arranged with different polarity magnetism. When the connecting magnetic plate (51) and the magnetic ring (82) are opposite to each other, the magnetic force between the two is greater than the elastic force of the second spring (81). In the initial state, the magnetic ring (82) is located in the middle of the air storage chamber (8) and the air bag (91) is in an unsaturated state. When the fixed mold base (1) and the movable mold base (2) are combined, the magnetic ring (82) is located at the bottom of the air storage chamber (8) and the air bag (91) is in a saturated state.

Images