Hot runner cooling device and mold

Abstract

The utility model discloses a hot runner cooling device and mould, the cooling device comprises a cooling air path, a first fan and a hot runner plate arranged in the mould, a hot runner is arranged in the hot runner plate, the top of the hot runner plate is provided with an inlet communicated with the hot runner, and the inlet is used for being communicated with a nozzle of an injection molding machine. At least one outlet communicated with the hot runner is formed in the bottom of the hot runner plate, the cooling air path is arranged in the mold, one end of the cooling air path is communicated with a first fan outside the mold, the other end of the cooling air path is communicated with the outside of the mold, and the cooling air path comprises a first branch and a second branch which are communicated; the first branch is arranged at the top of the hot runner plate and communicated with the inlet, and the second branch is arranged at the bottom of the hot runner plate and communicated with the outlet. Cooling airflow is blown into the first branch and the second branch through the fan to timely discharge heat, so that the temperature of the hot runner plate and the nozzle of the injection molding machine is effectively reduced, and internal sol is prevented from being carbonized due to overheating.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runner molds, and more specifically to a hot runner cooling device and a mold. Background Art

[0002] Hot runner molds are currently commonly used plastic material injection molding molds. Compared with cold runner structure molds, hot runner molds have the advantages of saving raw materials, shortening the molding cycle, reducing waste, improving product quality, eliminating subsequent processes, and facilitating production automation. A hot runner mold structure with good heat dissipation effect is now proposed.

[0003] The molten plastic in the hot runner mold will generate a lot of heat when passing through the hot runner. There is a gap between the mold and the hot runner plate, and hot air cannot be discharged. At this time, the temperature is high, which makes it easy for the hot runner plate and the nozzle to overheat, causing the PVC pipe fittings to turn yellow or the sol in the nozzle to carbonize, affecting the quality and production efficiency; and excessive heat shortens the service life of the hot runner plate.

[0004] Prior art CN106426804A discloses a hot runner mold, in which the hot runner mold comprises a main nozzle arranged in the bottom of the mold, a diverter plate connected to the main nozzle, a hot nozzle connected to the diverter plate, a flow control device and a temperature control device arranged on one side of the mold; a flow channel is arranged in the diverter plate; the flow channel comprises a main flow channel, a secondary flow channel and a diverter channel; the main flow channel is connected to the main nozzle, the diverter channel is connected to the nozzle, and the main flow channel is connected to the diverter channel through the secondary flow channel; the flow channel corners of the main flow channel, the secondary flow channel and the diverter channel are all curved corners; the cross-sections of the main flow channel, the secondary flow channel and the diverter channel are all located in the same plane, and this technical solution effectively solves the problem of material retention when the product flows in the mold by setting a curved corner in the flow channel; and the mold temperature is controlled by a temperature control device, but the diverter plate and the main nozzle cannot be cooled in time in this technical solution. Utility Model Content

[0005] In order to solve the above problems, the utility model proposes a hot runner cooling device and a mold. The cooling device can be configured with a cooling air path passing through the injection molding machine nozzle, and a first fan is used to blow air into the cooling air path to timely remove heat from the hot runner plate and the injection molding machine nozzle, thereby avoiding carbonization of the sol due to excessive temperature.

[0006] To achieve the above-mentioned purpose, a hot runner cooling device includes a cooling air path, a first fan and a hot runner plate arranged in a mold, a hot runner is arranged in the hot runner plate, an inlet connected to the hot runner is arranged at the top of the hot runner plate, the inlet is used to communicate with the nozzle of an injection molding machine, and at least one outlet connected to the hot runner is arranged at the bottom of the hot runner plate, the cooling air path is arranged in the mold, one end of the cooling air path is connected to the first fan outside the mold, and the other end of the cooling air path is connected to the outside of the mold, the cooling air path includes a first branch and a second branch that are connected to each other, the first branch is arranged at the top of the hot runner plate and connected to the inlet, and the second branch is arranged at the bottom of the hot runner plate and connected to the outlet.

[0007] In the present technical solution, the injection molding machine nozzle extends into the first branch and is connected to the inlet. At this time, the injection molding machine nozzle isolates the first branch from the inlet. The injection molding machine nozzle injects the sol into the hot runner plate through the inlet. The hot runner plate can continuously heat the sol to keep it in a molten state to ensure its fluidity. When the temperature of the injection molding machine nozzle and the hot runner plate is too high, the first fan passes a cooling airflow from outside the mold into the first branch and the second branch. The cooling airflow passes through the outer surface of the hot runner plate to cool the hot runner plate to ensure the service life of the hot runner plate, and the cooling airflow passes through the inlet to cool the injection molding machine nozzle to prevent overheating at the nozzle from causing carbonization of the sol or yellowing of the product. Finally, the cooling airflow takes the heat out of the mold.

[0008] As a preferred solution, in order to flow cooling air into the first branch and the second branch, the two ends of the first branch and the second branch are connected, and an air inlet and an air outlet are respectively provided at the connecting points at the two ends of the first branch and the second branch, the air inlet is connected to the first fan, and the air outlet is connected to the outside of the mold.

[0009] As a preferred solution, in order to speed up the flow of cooling airflow in the first branch and the second branch, a second fan connected to the air outlet is provided outside the mold, and the second fan is used to suck out the airflow of the first branch and the second branch.

[0010] As a preferred solution, the first fan generates an airflow and blows it into the cooling air path through the air inlet, and the second fan blows the airflow out of the mold through the air outlet. The cooling airflow flows from the air inlet into the first branch and the second branch respectively, and is finally discharged from the air outlet, so that the hot runner plate in the mold can be cooled quickly.

[0011] To achieve the above-mentioned purpose, a mold includes the above-mentioned hot runner cooling device, and also includes a matching front mold assembly and a rear mold assembly, a cavity is formed between the front mold assembly and the rear mold assembly, and the hot runner cooling device is arranged in the front mold assembly.

[0012] In this technical solution, the sol enters the cavity, and the hot runner cooling device cools the hot runner plate in time to remove the heat inside the mold, preventing the sol from overheating and carbonizing, thereby ensuring the normal operation of the mold.

[0013] As a preferred solution, the front mold assembly includes a front mold plate, a front mold base and a panel, the front mold base cover is arranged on the top of the front mold plate, the panel cover is arranged on the top of the front mold base, a hollow accommodating cavity is arranged inside the front mold base, the hot runner plate is installed in the accommodating cavity, a first gap is arranged between the top of the hot runner plate and the bottom of the panel, the first gap forms the first branch, a second gap is arranged between the bottom of the hot runner plate and the top of the front mold plate, the second gap forms the second branch, openings are respectively arranged on both sides of the front mold base, which are connected to the first gap and the second gap, the first fan is arranged on one side of the front mold base and is connected to the opening, the injection molding machine nozzle passes through the panel and is connected to the opening, the injection molding machine injects sol into the hot runner through the inlet, the hot runner plate continuously heats the sol, and then the sol flows into the cavity from the outlet, when the temperature of the hot runner plate is too high, under the action of the first fan, the heat in the first gap and the second gap is discharged through the opening.

[0014] As a preferred solution, the panel is provided with an injection port connected to the inlet, a positioning ring is provided on the injection port, a secondary hot nozzle with one end connected to the cavity is embedded in the top of the front template, and the other end of the secondary hot nozzle is connected to the outlet.

[0015] As a preferred solution, a third branch passing through the secondary hot nozzle is transversely penetrated in the front template, one end of the third branch is connected to the first fan, and the other end of the third branch is connected to the outside of the front template.

[0016] As a preferred solution, a first thermal insulation pad and a second thermal insulation pad are respectively provided in the first gap and the second gap, two ends of the first thermal insulation pad are respectively abutted against the end faces of the panel and the hot runner plate, and two ends of the second thermal insulation pad are respectively abutted against the end faces of the hot runner plate and the front template, and the first thermal insulation pad and the second thermal insulation pad enable the hot runner plate to be suspended in the accommodating cavity to prevent the high-temperature hot runner plate from directly contacting the panel and the front template, wherein the width of the hot runner plate is smaller than the width of the accommodating cavity, so that a vertical air duct is formed between the hot runner plate and the front mold base, and the air duct is connected with the openings on both sides of the front mold base, so that the first fan can be connected with the first branch and the second branch.

[0017] As a preferred solution, a positioning pin is provided on the top of the front template, one end of the positioning pin is plugged into the bottom of the hot runner plate, and the positioning pin is used to ensure that the hot runner plate is installed in place.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model uses the first fan to flow cooling air into the first branch and the second branch, and then discharges the cooling air out of the mold, so as to cool the hot runner plate in time and avoid overheating of the hot runner plate and shortening its service life.

[0020] 2. By passing the cooling airflow into the first branch and the second branch, the sol in the hot runner plate and the injection molding machine nozzle can be cooled in time to prevent the sol from overheating and carbonizing or causing the injection molded product to turn yellow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the hot runner cooling device of the utility model;

[0022] Figure 2 yes Figure 1 Cross-section view in the A direction;

[0023] Figure 3 yes Figure 1 Cross-sectional view along the B direction.

[0024] In the figure: hot runner plate 1; hot runner 101; inlet 102; outlet 103; heating pipe 104; first fan 2; second fan 3; first branch 4; second branch 5; third branch 6; air inlet 7; air outlet 8; cavity 9; front template 10; water channel 1001; front mold base 11; panel 12; positioning ring 1201; injection molding machine nozzle 13; secondary hot nozzle 14; first thermal insulation pad 15; second thermal insulation pad 16; positioning pin 17. DETAILED DESCRIPTION

[0025] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0028] Embodiment 1:

[0029] like Figures 1 to 3 As shown, a hot runner cooling device is provided, including a cooling air path, a first fan 2 and a hot runner plate 1 arranged in a mold, a hot runner 101 is arranged in the hot runner plate 1, an inlet 102 connected to the hot runner 101 is arranged at the top of the hot runner plate 1, the inlet 102 is used to communicate with the injection molding machine nozzle 13, and at least one outlet 103 connected to the hot runner 101 is arranged at the bottom of the hot runner plate 1, the cooling air path is arranged in the mold, one end of the cooling air path is connected to the first fan 2 outside the mold, and the other end of the cooling air path is connected to the outside of the mold, the cooling air path includes a first branch 4 and a second branch 5 that are connected, the first branch 4 is arranged at the top of the hot runner plate 1 and is connected to the inlet 102, and the second branch 5 is arranged at the bottom of the hot runner plate 1 and is connected to the outlet 103.

[0030] In this embodiment, the first fan 2 is an air pump, the hot runner 101 is a two-divided runner, two outlets are provided at the bottom of the hot runner plate 1 and are respectively connected to the two runners, and the hot runner plate 1 is equipped with a heating tube 104, which is used to continuously heat the sol in the hot runner plate 1.

[0031] Specifically, the two ends of the first branch 4 and the second branch 5 are connected, and an air inlet 7 and an air outlet 8 are respectively provided at the connecting points of the two ends of the first branch 4 and the second branch 5. The air inlet 7 is connected to the first fan 2, and the air outlet 8 is connected to the outside of the mold.

[0032] In this embodiment, if Figure 1As shown, the first fan 2 introduces the cooling airflow from the air inlet 7, and the cooling airflow is divided and enters the first branch 4 and the second branch 5 respectively, wherein the cooling airflow can cool the injection molding machine nozzle 13 in the first branch 4 to prevent the sol in the injection molding machine nozzle 13 from overheating and carbonizing.

[0033] Specifically, a second fan 3 connected to the air outlet 8 is provided outside the mold, the first fan 2 generates airflow and blows it into the cooling air path through the air inlet 7, and the second fan 3 blows the airflow out of the mold through the air outlet 8.

[0034] In this embodiment, the second fan 3 is an air suction pump, which is used to suck out the airflow in the first branch 4 and the second branch 5 and discharge them to the outside of the mold to speed up the flow speed of the cooling airflow, thereby improving the cooling efficiency.

[0035] like Figures 1 to 3 As shown, a mold is provided, including the above-mentioned hot runner cooling device, and also including a matching front mold assembly and a rear mold assembly, a cavity 9 is formed between the front mold assembly and the rear mold assembly, and the hot runner cooling device is arranged in the front mold assembly.

[0036] In this embodiment, the cavity 9 is used to form a PVC pipe product, and the hot runner cooling device can discharge the heat inside the mold in time to avoid carbonization of the sol or yellowing of the product and affect the production quality.

[0037] Specifically, the front mold assembly includes a front mold plate 10, a front mold base 11 and a panel 12, the front mold base 11 is covered on the top of the front mold plate 10, the panel 12 is covered on the top of the front mold base 11, a hollow accommodating cavity is provided inside the front mold base 11, the hot runner plate 1 is installed in the accommodating cavity, a first gap is provided between the top of the hot runner plate 1 and the bottom of the panel 12, the first gap forms the first branch 4, a second gap is provided between the bottom of the hot runner plate 1 and the top of the front mold plate 10, the second gap forms the second branch 5, openings are provided on both sides of the front mold base 11 respectively connected to the first gap and the second gap, and the first fan 2 is provided on one side of the front mold base 11 and connected to the opening.

[0038] In this embodiment, a water channel 1001 for cooling the injection molded product is provided in the front template 10, and the first gap and the second gap are used to form a first branch 4 and a second branch 5 for cooling air flow to flow in, so that the hot runner plate 1 can be quickly cooled at high temperature.

[0039] Specifically, the panel 12 is provided with an injection port connected to the inlet 102, and a positioning ring 1201 is provided on the injection port. A secondary hot nozzle 14 with one end connected to the cavity 9 is embedded in the top of the front template 10, and the other end of the secondary hot nozzle 14 is connected to the outlet 103.

[0040] In this embodiment, the injection molding machine nozzle 13 is installed on the positioning ring 1201, and the first end of the injection molding machine nozzle 13 extends out of the injection port and passes through the first branch 4 to be connected to the inlet 102, so that the sol enters the hot runner 101. After being diverted, the sol flows into the secondary hot nozzle 14 from the two outlets 103 respectively, and finally the secondary hot nozzle 14 injects the sol into the cavity 9.

[0041] Specifically, a first thermal insulation pad 15 and a second thermal insulation pad 16 are respectively provided in the first gap and the second gap, and two ends of the first thermal insulation pad 15 are respectively abutted against the end surfaces of the panel 12 and the hot runner plate 1, and two ends of the second thermal insulation pad 16 are respectively abutted against the end surfaces of the hot runner plate 1 and the front template 10.

[0042] In this embodiment, the first thermal insulation pad 15 and the second thermal insulation pad 16 are used to suspend the hot runner plate 1 in the accommodating cavity to form a first gap and a second gap, which can prevent the upper and lower end surfaces of the hot runner plate 1 from directly contacting the front template 10 and the panel 12, wherein the lateral width of the accommodating cavity is greater than the lateral width of the hot runner plate 1, so that a vertical airway is formed between the accommodating cavity and the left and right sides of the hot runner plate 1, and the upper and lower ends of the airway are respectively connected to the first gap and the second gap, and the air inlet 7 and the air outlet 8 are respectively arranged on both sides of the front mold base 11 and are connected to the airway.

[0043] Embodiment 2:

[0044] This embodiment is similar to Embodiment 1, except that, in this embodiment, Figure 3 As shown, a third branch 6 passing through the secondary hot nozzle 14 is transversely penetrated in the front template 10 , one end of the third branch 6 is connected to the first fan 2 , and the other end of the third branch 6 is connected to the second fan 3 .

[0045] In this embodiment, the third branch 6 is used to cool the secondary hot nozzle 14 to prevent the sol in the secondary hot nozzle 14 from being overheated and carbonized.

[0046] Embodiment 3:

[0047] This embodiment is similar to Embodiment 1, except that, in this embodiment, Figure 1 As shown, a positioning pin 17 is provided on the top of the front mold plate 10 , and one end of the positioning pin 17 is plugged into the bottom of the hot runner plate 1 .

[0048] In this embodiment, the positioning pins 17 are used to ensure that the hot runner plate 1 is installed in place to prevent the sol from leaking out when the hot runner plate 1 is misaligned.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0050] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A hot runner cooling device, characterized in that: The invention comprises a cooling air path, a first fan (2) and a hot runner plate (1) arranged in a mold, wherein a hot runner (101) is arranged in the hot runner plate (1), an inlet (102) connected to the hot runner (101) is arranged at the top of the hot runner plate (1), the inlet (102) is used to communicate with an injection molding machine nozzle (13), and at least one outlet (103) connected to the hot runner (101) is arranged at the bottom of the hot runner plate (1), the cooling air path is arranged in the mold, one end of the cooling air path is connected to the first fan (2) outside the mold, and the other end of the cooling air path is connected to the outside of the mold, and the cooling air path comprises a first branch (4) and a second branch (5) which are connected to each other, the first branch (4) is arranged at the top of the hot runner plate (1) and is connected to the inlet (102), and the second branch (5) is arranged at the bottom of the hot runner plate (1) and is connected to the outlet (103).

2. A hot runner cooling device according to claim 1, characterized in that: The first branch (4) and the second branch (5) are connected at both ends, and an air inlet (7) and an air outlet (8) are respectively provided at the connecting point between the first branch (4) and the second branch (5), the air inlet (7) is connected to the first fan (2), and the air outlet (8) is connected to the outside of the mold.

3. A hot runner cooling device according to claim 2, characterized in that: A second fan (3) connected to the air outlet (8) is provided outside the mold.

4. A hot runner cooling device according to claim 3, characterized in that: The first fan (2) generates an airflow and blows the airflow into the cooling air path through the air inlet (7), and the second fan (3) blows the airflow out of the mold through the air outlet (8).

5. A mold, characterized in that: It comprises the hot runner cooling device as described in any one of claims 1 to 4, and also comprises a matching front mold assembly and a rear mold assembly, wherein a cavity (9) is formed between the front mold assembly and the rear mold assembly, and the hot runner cooling device is arranged in the front mold assembly.

6. A mold according to claim 5, characterized in that: The front mold assembly comprises a front mold plate (10), a front mold base (11) and a panel (12); the front mold base (11) is covered on the top of the front mold plate (10); the panel (12) is covered on the top of the front mold base (11); a hollow accommodating cavity is provided inside the front mold base (11); the hot runner plate (1) is installed in the accommodating cavity; a first gap is provided between the top of the hot runner plate (1) and the bottom of the panel (12); the first gap forms the first branch (4); a second gap is provided between the bottom of the hot runner plate (1) and the top of the front mold plate (10); the second gap forms the second branch (5); openings are provided on both sides of the front mold base (11) and are respectively connected to both ends of the first gap and the second gap; the first fan (2) is provided on one side of the front mold base (11) and is connected to the openings.

7. A mold according to claim 6, characterized in that: The panel (12) is provided with an injection port connected to the inlet (102), and a positioning ring (1201) is provided on the injection port. A secondary hot nozzle (14) having one end connected to the cavity (9) is embedded in the top of the front template (10), and the other end of the secondary hot nozzle (14) is connected to the outlet (103).

8. A mold according to claim 7, characterized in that: A third branch (6) passing through the secondary hot nozzle (14) is transversely passed through the front template (10); one end of the third branch (6) is connected to the first fan (2), and the other end of the third branch (6) is connected to the outside of the front template (10).

9. A mold according to claim 6, characterized in that: A first thermal insulation pad (15) and a second thermal insulation pad (16) are respectively provided in the first gap and the second gap, the two ends of the first thermal insulation pad (15) respectively abut against the end faces of the panel (12) and the hot runner plate (1), and the two ends of the second thermal insulation pad (16) respectively abut against the end faces of the hot runner plate (1) and the front template (10).

10. A mold according to claim 6, characterized in that: A positioning pin (17) is provided at the top of the front mold plate (10), and one end of the positioning pin (17) is plugged into the bottom of the hot runner plate (1).

Images