A kind of anti-tearing structure based on deep cavity injection mold

Abstract

The utility model belongs to injection mold technical field especially relates to a kind of anti-injury structure based on deep cavity injection mold, including base, the base top four corners are all provided with guide rod, the base top middle part is equipped with installation bin. By being equipped with multiple second electric push rods in installation bin, second electric push rod can be driven to lift top plate, so that top plate can eject the plastic parts inside the forming cavity of lower mold, and top plate can also be lowered into installation bin, so that top plate is conveniently replaced quickly, and by being equipped with lower mold and upper mold on installation bin, when demolding, two first electric push rods can be used to push upper mold to move upwards, lower mold and upper mold are separated in advance, so that upper mold is separated from the outside of plastic parts in advance, and then second electric push rod is used to push top plate to move upwards, so that top plate ejects the plastic parts in the forming cavity of lower mold, so that plastic parts are demolded gradually, and the risk of plastic parts injury is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an anti-tear structure based on a deep cavity injection mold. Background Technology

[0002] Chinese Patent CN223369990U, authorized by the Ministry of Industry and Information Technology, discloses an anti-tear-damage structure based on a deep-cavity injection mold. The structure includes a base, four first guide rods fixed at the top corners of the base, and a mold structure mounted on the first guide rods for injection molding. The mold structure includes: a lower mold assembly comprising a lower mold base slidably mounted above the base via the first guide rods, a mounting plate slidably mounted at the lower end inside the lower mold base, a base plate mounted on the top of the mounting plate, several ejector pins mounted on the base plate, and a lower mold head mounted at the upper end inside the lower mold base; an upper mold assembly comprising an upper mold base mounted on the upper end of the lower mold base, and an upper mold head mounted at the lower end inside the upper mold base; and an anti-tear-damage assembly comprising a base plate fixed to the top of the base, a second cylinder mounted at one end of the base plate, and a downward inclined block mounted at the output end of the second cylinder. This structure avoids the phenomenon of uneven pressure on the product surface and whitening caused by directly ejecting the product after mold opening.

[0003] However, the above-mentioned technical solutions still have the following shortcomings in actual use. Key components such as ejector pins and lower inclined blocks are prone to wear after long-term use. In the existing structure, the components are assembled compactly, and the disassembly and replacement process is cumbersome, which not only affects production efficiency but may also lead to a decrease in mold precision due to improper maintenance, increasing the probability of plastic parts being scratched. Furthermore, the solution does not have a targeted design for the venting system of deep cavity molds. Gas generated during injection molding is prone to accumulate at the bottom and corners of the deep cavity, causing the plastic parts to fit tightly against the cavity wall, increasing demolding resistance, and indirectly aggravating the risk of scratching. Therefore, we propose a scratch-resistant structure based on deep cavity injection molds to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a tear-resistant structure based on a deep cavity injection mold to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tear-resistant structure based on a deep cavity injection mold, comprising a base, guide rods at the four corners of the top of the base, an installation chamber at the center of the top of the base, a lower mold base at the upper end of the installation chamber, a middle mold base at the upper end of the lower mold base, an upper mold base at the upper end of the middle mold base, a gate at the top of the upper mold base, a lower mold at the center of the lower mold base, an upper mold at the center of the middle mold base, a molding cavity in both the lower and upper molds, first electric push rods on both sides of the top of the lower mold base, rubber pads at the output ends of both sets of first electric push rods, multiple sets of second electric push rods installed in the installation chamber, a receiving groove at the bottom of the molding cavity in the lower mold, a top plate installed in each receiving groove, the output ends of the second electric push rods connected to the bottom of the top plate, an inspection door hinged to the front of the installation chamber, and an auxiliary venting assembly on the outside of the lower mold.

[0006] As an improved technical solution, the auxiliary exhaust assembly includes multiple sets of exhaust holes opened on the side wall of the lower mold, and an air pump is installed outside each exhaust hole.

[0007] As an improved technical solution, a copper mesh filter layer is installed inside the exhaust port.

[0008] As an improved technical solution, the inspection door is equipped with an observation window.

[0009] As an improved technical solution, the top plate is made of high-strength wear-resistant alloy steel, and the top plate is connected to the second electric push rod through a quick-change connector.

[0010] As an improved technical solution, the air pump is electrically connected to the main controller, and the main controller automatically controls the start and stop of the air pump according to the injection cycle.

[0011] As an improved technical solution, the exhaust port is arranged at an angle, with its outlet direction facing the outside of the molding cavity.

[0012] After adopting the above technical solution, the beneficial effects of this utility model are:

[0013] I. This utility model, by installing multiple sets of second electric push rods in the installation chamber, allows the second electric push rods to drive the top plate to rise and fall, enabling the top plate to eject the plastic part inside the molding cavity of the lower mold for demolding. Alternatively, the top plate can be lowered into the installation chamber for easy and quick replacement. Furthermore, by installing a lower mold and an upper mold on the installation chamber, during demolding, the two sets of first electric push rods first push the upper mold upwards, separating the lower mold from the upper mold in advance, allowing the upper mold to leave the outside of the plastic part ahead of time. Then, the second electric push rods push the top plate upwards, allowing the top plate to eject the plastic part from the molding cavity of the lower mold, thus achieving gradual demolding of the plastic part and effectively reducing the risk of damage to the plastic part.

[0014] II. This utility model distributes vent holes in the deep cavity and corners of the lower mold, allowing the air pump to actively expel the gas accumulated during the injection molding process through negative pressure suction. This prevents gas retention from causing the plastic part to adhere too tightly to the cavity wall, and allows the air pump to provide active venting capability, improving venting efficiency and avoiding defects in the plastic part caused by gas compression. The targeted venting design effectively reduces gas accumulation in the deep cavity and lowers demolding resistance. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the first partially disassembled state of the present invention;

[0017] Figure 3 This is a partial cross-sectional structural diagram of the present invention;

[0018] Figure 4 For the present utility model Figure 3 A schematic diagram of the structure viewed from below.

[0019] In the diagram: 1. Base; 2. Guide rod; 3. Mounting chamber; 4. Lower mold base; 5. Middle mold base; 6. Upper mold base; 7. Gate; 8. Lower mold; 9. Upper mold; 10. Molding cavity; 11. First electric push rod; 12. Rubber pad; 13. Vent hole; 14. Air pump; 15. Storage slot; 16. Second electric push rod; 17. Top plate; 18. Inspection door. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] This utility model provides a technical solution: such as Figures 1 to 4As shown in this embodiment, an anti-tear structure based on a deep cavity injection mold includes a base 1, guide rods 2 at each of the four corners of the top of the base 1, an installation chamber 3 installed in the middle of the top of the base 1, a lower mold base 4 installed on the upper end of the installation chamber 3, a middle mold base 5 installed on the upper end of the lower mold base 4, an upper mold base 6 installed on the upper end of the middle mold base 5, a gate 7 at the top of the upper mold base 6, a lower mold 8 installed in the middle of the lower mold base 4, and an upper mold 9 installed in the middle of the middle mold base 5. Both the lower mold 8 and the upper mold 9 have internal openings. The cavity 10 and the lower mold base 4 are equipped with first electric push rods 11 on both sides of the top. The output ends of the two sets of first electric push rods 11 are equipped with rubber pads 12. Multiple sets of second electric push rods 16 are installed in the installation chamber 3. The bottom of the molding cavity 10 in the lower mold 8 is provided with a storage groove 15. The storage groove 15 is equipped with a top plate 17. The output ends of the second electric push rods 16 are connected to the bottom of the top plate 17. The front end of the installation chamber 3 is hinged with an inspection door 18. The lower mold 8 is provided with an auxiliary exhaust component.

[0022] By installing multiple sets of second electric push rods 16 in the installation chamber 3, the second electric push rods 16 can drive the top plate 17 to rise and fall, allowing the top plate 17 to eject the plastic part inside the molding cavity 10 of the lower mold 8 for demolding. The top plate 17 can also be lowered into the installation chamber 3, facilitating quick replacement of the top plate 17. Furthermore, by installing the lower mold 8 and the upper mold 9 on the installation chamber 3, during demolding, the two sets of first electric push rods 11 can first push the upper mold 9 upward, causing the lower mold 8 and the upper mold 9 to separate in advance, allowing the upper mold 9 to leave the outside of the plastic part in advance. Then, the second electric push rods 16 can push the top plate 17 upward, allowing the top plate 17 to eject the plastic part inside the molding cavity 10 of the lower mold 8, thereby achieving gradual demolding of the plastic part and effectively reducing the risk of damage to the plastic part.

[0023] In other embodiments, the auxiliary venting assembly includes multiple sets of venting holes 13 formed on the side wall of the lower mold 8, and an air pump 14 is installed on the outside of each venting hole 13;

[0024] By distributing the vent holes 13 in the deep cavity and corners of the lower mold 8, the air pump 14 actively discharges the gas accumulated during the injection molding process through negative pressure suction, preventing gas stagnation from causing the plastic part to fit too tightly against the cavity wall. The air pump 14 provides active venting capability, improves venting efficiency, and avoids defects in the plastic part caused by gas compression. The targeted venting design effectively reduces gas accumulation in the deep cavity and lowers demolding resistance.

[0025] In other embodiments, a copper mesh filter layer is installed inside the exhaust port 13;

[0026] This design allows the copper mesh filter layer to be embedded inside the exhaust hole 13, filtering molten plastic particles and impurities when the gas is discharged, preventing blockage of the exhaust channel, extending the service life of the exhaust assembly, and reducing the frequency of maintenance.

[0027] In other embodiments, the access door 18 is provided with an observation window;

[0028] This design allows the observation window to be made of high-temperature resistant transparent material, enabling operators to visually monitor the internal operating status without opening the maintenance door 18. This improves operational safety, reduces the need for frequent opening and closing of the maintenance door 18, and allows for real-time monitoring to help detect abnormalities in a timely manner and prevent production interruptions.

[0029] In other embodiments, the top plate 17 is made of high-strength wear-resistant alloy steel, and the top plate 17 is connected to the second electric push rod 16 via a quick-connect coupling;

[0030] This design allows the top plate 17 to act as the ejector component that directly contacts the plastic part. The use of wear-resistant materials reduces wear, while the quick-connect coupling design allows for rapid disassembly and replacement without disassembling the entire ejection system. This significantly reduces maintenance time and costs, and improves equipment utilization.

[0031] In other embodiments, the air pump 14 is electrically connected to the main controller, which automatically controls the start and stop of the air pump 14 according to the injection cycle.

[0032] This design allows the main controller to receive signals from the injection molding machine, start the air pump 14 to vent air during the injection and holding pressure stages, and stop it before mold opening. This synchronizes the venting process with the injection cycle, allowing automated control to improve venting accuracy and efficiency while reducing human intervention.

[0033] In other embodiments, the vent 13 is arranged at an angle, with its outlet direction facing outward of the molding cavity 10;

[0034] This design allows the inclined exhaust port 13 to utilize the natural flow direction of gas, enhancing the exhaust effect, preventing molten material backflow, optimizing the airflow path, and improving exhaust efficiency.

[0035] This utility model provides a tear-resistant structure based on a deep cavity injection mold, and its working principle is as follows:

[0036] In use, the upper mold base 6, middle mold base 5, and lower mold base 4 are moved downward along the guide rod 2, and the molten plastic is injected into the molding cavity 10 through the gate 7. At the same time, the air pump 14 is started to actively expel the gas in the cavity through the vent 13 to prevent gas accumulation. After the injection is completed, the air pump 14 continues to run for a while to ensure that the gas is completely expelled. When the plastic part is shaped, the rubber pad 12 is driven by the first electric push rod 11 to separate the middle mold base 5 and the lower mold base 4. The lower mold base 4 remains fixed. Then, the second electric push rod 16 pushes the top plate 17 upward to smoothly eject the plastic part from the lower mold 8. The ejection force is evenly distributed to avoid local stress concentration that could cause the plastic part to be damaged. The inspection door 18 provides a convenient access channel, allowing the top plate 17 to be quickly replaced through the quick-change connector.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A tear-resistant structure based on a deep cavity injection mold, comprising a base (1), characterized in that: The base (1) has guide rods (2) at each of its four corners. An installation chamber (3) is installed in the middle of the top of the base (1). A lower mold base (4) is installed on the upper end of the installation chamber (3). A middle mold base (5) is installed on the upper end of the lower mold base (4). An upper mold base (6) is installed on the upper end of the middle mold base (5). A gate (7) is installed at the top of the upper mold base (6). A lower mold (8) is installed in the middle of the lower mold base (4). An upper mold (9) is installed in the middle of the middle mold base (5). A molding cavity (10) is opened inside both the lower mold (8) and the upper mold (9). The lower mold base (4)... The top two sides of the mold are equipped with first electric push rods (11), and the output ends of the two sets of first electric push rods (11) are equipped with rubber pads (12). Multiple sets of second electric push rods (16) are installed in the installation chamber (3). The bottom end of the forming cavity (10) in the lower mold (8) is provided with a storage groove (15). The storage groove (15) is equipped with a top plate (17). The output ends of the second electric push rods (16) are connected to the bottom end of the top plate (17). The front end of the installation chamber (3) is hinged with an inspection door (18). The lower mold (8) is provided with an auxiliary exhaust assembly.

2. The anti-tear structure based on a deep cavity injection mold according to claim 1, characterized in that: The auxiliary exhaust assembly includes multiple sets of exhaust holes (13) opened on the side wall of the lower mold (8), and an air pump (14) is installed on the outside of each exhaust hole (13).

3. The anti-tear structure based on a deep cavity injection mold according to claim 2, characterized in that: A copper mesh filter layer is installed inside the exhaust port (13).

4. The anti-tear structure based on a deep cavity injection mold according to claim 1, characterized in that: The inspection door (18) is equipped with an observation window.

5. The anti-tear structure based on a deep cavity injection mold according to claim 1, characterized in that: The top plate (17) is made of high-strength wear-resistant alloy steel, and the top plate (17) is connected to the second electric push rod (16) through a quick-connect coupling.

6. The anti-tear structure based on a deep cavity injection mold according to claim 2, characterized in that: The air pump (14) is electrically connected to the main controller, which automatically controls the start and stop of the air pump (14) according to the injection cycle.

7. The anti-tear structure based on a deep cavity injection mold according to claim 2, characterized in that: The vent (13) is arranged at an angle, with its outlet direction facing the outside of the molding cavity (10).

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