Cooling structure of mold for vertical injection molding machine

Abstract

The utility model discloses a cooling structure of a mold for a vertical injection molding machine, which relates to the technical field of molds for vertical injection molding machines and comprises an injection molding machine body, and a lifting mechanism, an upper mold connected with the lifting mechanism and a lower mold component arranged on a worktable of the injection molding machine body are sequentially arranged on the injection molding machine body from top to bottom. The upper mold can be closed and demolded with the lower mold assembly under the control of the lifting mechanism; the lower die assembly comprises a lower die body, a bearing ring and an outer cover which are sequentially stacked from top to bottom, the outer cover and the lower die body are connected through the bearing ring, and a heat dissipation cavity is formed between the lower die body and the outer cover; the lower die body is of a hollow structure, and a first cooling mechanism and a second cooling mechanism which dissipate heat of the lower die body are arranged on the outer cover. And the first cooling mechanism and the second cooling mechanism are mounted on the outer cover, so that heat dissipation on the lower mold body in the injection molding process is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of molds for vertical injection molding machines, in particular to a cooling structure of the molds for vertical injection molding machines. Background Art

[0002] Vertical injection molding machine is the main molding equipment that injects liquid thermoplastic or thermosetting plastic into the molding mold through the injection device, and the plastic is cooled in the mold to make plastic products of various shapes. Among them, the mold is an important part of the injection molding machine. The quality of the mold cooling system design is a key factor in the success of the mold design, which directly affects the quality and production efficiency of plastic products. In the injection molding process, the cooling time of plastic products in the mold cavity accounts for 50%~60% of the entire molding cycle, and the cooling speed and uniformity directly affect the quality of the product. If the cooling system is not designed reasonably, it will result in a long production cycle and high cost. On the other hand, uneven cooling will also cause the product to warp due to thermal stress, thereby affecting the product quality. Some molds of existing injection molding machines have poor heat dissipation.

[0003] Therefore, a cooling structure for a mold for a vertical injection molding machine is proposed. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a cooling structure for a mold of a vertical injection molding machine.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A cooling structure for a mold for a vertical injection molding machine comprises an injection molding machine body, on which a lifting mechanism, an upper mold connected to the lifting mechanism and a lower mold assembly arranged on a workbench of the injection molding machine body are arranged in sequence from top to bottom, and the upper mold can be molded and demolded with the lower mold assembly under the control of the lifting mechanism; the lower mold assembly comprises a lower mold body, a supporting ring and an outer cover stacked in sequence from top to bottom, the outer cover and the lower mold body are connected through the supporting ring, and a heat dissipation chamber is formed between the lower mold body and the outer cover; the lower mold body is a hollow structure, and the outer cover is provided with a first cooling mechanism and a second cooling mechanism for dissipating heat from the lower mold body.

[0007] Furthermore, in the utility model, the first cooling mechanism comprises a water inlet pipe and a water outlet pipe which are passed through the outer cover, the water inlet pipe is connected with the interior of the lower mold body, and the water outlet pipe is connected with the heat dissipation chamber; a plurality of liquid outlet holes are provided on the side wall of the lower mold body, and the interior of the lower mold body and the heat dissipation chamber are connected through the plurality of liquid outlet holes; the water outlet of the water inlet pipe on the outer cover is lower than the water inlet of the water outlet pipe.

[0008] Furthermore, in the utility model, the second cooling mechanism includes an exhaust pipe passing through the outer cover, the exhaust pipe is connected to the heat dissipation chamber, the air inlet of the exhaust pipe on the outer cover is higher than the water inlet of the water outlet pipe; a plurality of air inlet holes are provided on the supporting ring, and the plurality of air inlet holes are connected to the heat dissipation chamber.

[0009] Furthermore, in the utility model, a plurality of air ducts are arranged at intervals on the bottom wall of the supporting ring, and the plurality of air ducts are connected to the plurality of air inlet holes in a one-to-one correspondence; any of the air ducts extends toward the inner bottom wall of the outer cover, and a distance between an end of any of the air ducts close to the inner bottom wall of the outer cover and the inner bottom wall of the outer cover is smaller than a distance from a water inlet of the water outlet pipe to the inner bottom wall of the outer cover.

[0010] The beneficial effects of the utility model are:

[0011] The utility model provides a cooling structure for a mold of a vertical injection molding machine. The lower mold component comprises a lower mold body, a supporting ring and an outer cover. A first cooling mechanism and a second cooling mechanism are installed on the outer cover to facilitate heat dissipation of the lower mold body during the injection molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 This is a schematic structural diagram of a lower mold assembly according to an embodiment of the utility model;

[0014] Figure 3 An exploded view of the lower mold assembly of an embodiment of the utility model;

[0015] Figure 4 A cross-sectional view of a lower mold assembly according to an embodiment of the present utility model;

[0016] Figure 5 It is a cross-sectional view of the lower mold assembly according to an embodiment of the present utility model.

[0017] In the figure: 101-injection molding machine body; 201-lifting mechanism; 301-upper mold; 401-lower mold body; 402-supporting ring; 403-outer cover; 501-heat dissipation chamber; 601-water inlet pipe; 602-water outlet pipe; 603-liquid outlet hole; 701-exhaust pipe; 702-air inlet hole; 801-air guide pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-5 , the utility model provides a technical solution:

[0020] A cooling structure for a mold for a vertical injection molding machine includes an injection molding machine body 101, on which a lifting mechanism 201, an upper mold 301 connected to the lifting mechanism 201, and a lower mold assembly arranged on a workbench of the injection molding machine body 101 are arranged in sequence from top to bottom, and the upper mold 301 can be molded and demolded with the lower mold assembly under the control of the lifting mechanism 201; the lower mold assembly includes a lower mold body 401, a supporting ring 402, and an outer cover 403 stacked in sequence from top to bottom, the outer cover 403 and the lower mold body 401 are connected through the supporting ring 402, and a heat dissipation chamber 501 is formed between the lower mold body 401 and the outer cover 403; the lower mold body 401 is a hollow structure, and the lifting mechanism 201 can use a commonly used hydraulic lifting mechanism 201. The upper surface of the lower mold body 401 and the lower surface of the upper mold 301 are both provided with depressions. When the upper mold 301 and the lower mold body 401 are closed, the two depressions form a closed area for accommodating the injected plastic.

[0021] Heat is generated during the injection molding process, and this heat is transferred to the mold, causing the temperature of the mold to rise. In order to cool the mold, a first cooling mechanism and a second cooling mechanism for dissipating heat from the lower mold body 401 are provided on the outer cover 403 .

[0022] Specifically, the first cooling mechanism includes a water inlet pipe 601 and a water outlet pipe 602 which are arranged on the outer cover 403. The water inlet pipe 601 is connected to the interior of the lower mold body 401, and the water outlet pipe 602 is connected to the heat dissipation chamber 501. The side wall of the lower mold body 401 is provided with a plurality of liquid outlet holes 603, and the interior of the lower mold body 401 and the heat dissipation chamber 501 are connected through the plurality of liquid outlet holes 603. The water outlet of the water inlet pipe 601 on the outer cover 403 is lower than the water inlet of the water outlet pipe 602. The coolant first flows into the interior of the lower mold body 401, and then flows into the heat dissipation chamber 501 through the liquid outlet holes 603. When the liquid level in the heat dissipation chamber 501 submerges the water inlet of the water outlet pipe 602, the coolant can flow out through the water outlet pipe 602. The flow process of the coolant can take away part of the heat of the mold. The water outlet of the water inlet pipe 601 is lower than the water inlet of the water outlet pipe 602, so that a part of the coolant can be stored in the outer cover 403, and the liquid that has just flowed into the heat dissipation chamber 501 is prevented from immediately flowing out of the water outlet pipe 602, thereby reducing the heat dissipation effect.

[0023] The second cooling mechanism includes an exhaust pipe 701 passing through the outer cover 403, the exhaust pipe 701 is connected to the heat dissipation chamber 501, and the air inlet of the exhaust pipe 701 on the outer cover 403 is higher than the water inlet of the water outlet pipe 602; a plurality of air inlet holes 702 are provided on the support ring 402, and the plurality of air inlet holes 702 are connected to the heat dissipation chamber 501. During demoulding, the upper mold 301 and the lower mold body 401 are gradually separated. This design can utilize air flow to take away the heat in the heat dissipation chamber 501 to increase the heat dissipation effect of the mold. Specifically, during the demoulding process, there is a gap between the upper mold 301 and the lower mold body 401. At this time, the vacuum pump connected to the exhaust pipe 701 works to extract the hot air in the heat dissipation chamber 501. When the hot air in the heat dissipation chamber 501 is completely exhausted, negative pressure is formed in the heat dissipation chamber 501. Under the action of the pressure difference, the outside air can enter the heat dissipation chamber 501 through the air inlet hole 702, and then be discharged from the exhaust pipe 701. When the injection molding device produces plastic parts, a lot of volatile chemical components will be generated. When the concentration is high, it will cause damage to the human respiratory tract. Therefore, it is necessary to extract the volatile substances when the injection mold is opened to ensure the breathing safety of the construction workers. This design can also extract some volatile substances during the mold opening process to reduce the harm of such substances to the health of the workers. The air inlet of the exhaust pipe 701 on the outer cover 403 is higher than the water inlet of the water outlet pipe 602, so that the water in the outer cover 403 cannot enter the exhaust pipe 701 when the air is exhausted.

[0024] In some implementations of this embodiment, a plurality of air guide tubes 801 are arranged at intervals on the bottom wall of the support ring 402, and the plurality of air guide tubes 801 are connected to the plurality of air inlet holes 702 in a one-to-one correspondence; any air guide tube 801 extends to the inner bottom wall of the outer cover 403, and the distance between the end of any air guide tube 801 close to the inner bottom wall of the outer cover 403 and the inner bottom wall of the outer cover 403 is smaller than the distance between the water inlet of the water outlet pipe 602 and the inner bottom wall of the outer cover 403. This design utilizes the filtering principle of the hookah to filter harmful substances in tobacco. During the mold opening process, the coolant flows all the time, and the air outlet ends of all the air guide tubes 801 are located in the coolant. In this way, when the exhaust pipe 701 is exhausting, the volatiles generated during the mold opening process flow into the exhaust pipe 701 through the air inlet holes 702, the exhaust pipe 701, the coolant and the heat dissipation chamber 501 in sequence, so as to achieve the purpose of discharging harmful volatiles. The harmful volatiles will be filtered once in the process of "shuttle" in the coolant to achieve the purpose of filtering harmful volatiles. At the same time, this design can also take away some heat to achieve the purpose of heat dissipation.

[0025] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A cooling structure for a mold of a vertical injection molding machine, comprising an injection molding machine body (101), characterized in that: The injection molding machine body (101) is provided with a lifting mechanism (201), an upper mold (301) connected to the lifting mechanism (201), and a lower mold assembly arranged on the workbench of the injection molding machine body (101) in sequence from top to bottom, and the upper mold (301) can be molded and demolded with the lower mold assembly under the control of the lifting mechanism (201); the lower mold assembly comprises a lower mold body (401), a supporting ring (402), and an outer cover (403) stacked in sequence from top to bottom, the outer cover (403) and the lower mold body (401) are connected via the supporting ring (402), and a heat dissipation chamber (501) is formed between the lower mold body (401) and the outer cover (403); the lower mold body (401) is a hollow structure, and the outer cover (403) is provided with a first cooling mechanism and a second cooling mechanism for dissipating heat from the lower mold body (401).

2. The cooling structure of a mold for a vertical injection molding machine according to claim 1, characterized in that: The first cooling mechanism comprises a water inlet pipe (601) and a water outlet pipe (602) which are passed through the outer cover (403); the water inlet pipe (601) is connected to the interior of the lower mold body (401), and the water outlet pipe (602) is connected to the heat dissipation chamber (501); a plurality of liquid outlet holes (603) are provided on the side wall of the lower mold body (401), and the interior of the lower mold body (401) and the heat dissipation chamber (501) are connected via the plurality of liquid outlet holes (603); and a water outlet of the water inlet pipe (601) on the outer cover (403) is lower than a water inlet of the water outlet pipe (602).

3. The cooling structure of a mold for a vertical injection molding machine according to claim 2, characterized in that: The second cooling mechanism comprises an exhaust pipe (701) passing through the outer cover (403), the exhaust pipe (701) being connected to the heat dissipation chamber (501), and an air inlet of the exhaust pipe (701) on the outer cover (403) being higher than a water inlet of the water outlet pipe (602); a plurality of air inlet holes (702) are provided on the supporting ring (402), and the plurality of air inlet holes (702) are connected to the heat dissipation chamber (501).

4. The cooling structure of a mold for a vertical injection molding machine according to claim 3, characterized in that: A plurality of air guide tubes (801) are arranged at intervals on the bottom wall of the supporting ring (402), and the plurality of air guide tubes (801) are connected to the plurality of air inlet holes (702) in a one-to-one correspondence; any of the air guide tubes (801) extends toward the inner bottom wall of the outer cover (403), and the distance between the end of any of the air guide tubes (801) close to the inner bottom wall of the outer cover (403) and the inner bottom wall of the outer cover (403) is smaller than the distance from the water inlet of the water outlet pipe (602) to the inner bottom wall of the outer cover (403).

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