Unequal-wall-thickness refrigerator drawer mask injection mold based on pre-deformation control technology

Abstract

The utility model belongs to the technical field of molds, and relates to an unequal-wall-thickness refrigerator drawer mask injection mold based on a pre-deformation control technology. The refrigerator drawer mask forming die comprises a refrigerator drawer mask forming lower die and a refrigerator drawer mask forming upper die. In the injection molding process, the drawer mask body forming protrusion enters the forming cavity defined by the drawer mask body forming bottom plate, the end thick-wall forming piece and the side wall forming piece to form a complete cavity, molten materials are subjected to injection molding and flow dividing through the injection molding flow dividing piece, the combined forming module is adopted, and the forming efficiency is improved. The refrigerator fruit and vegetable box drawer mask is large in end depth and wall thickness and small in two side wall thickness, secondary processing is not needed, mold opening is conducted after injection molding is completed, an oil cylinder assists a demolding part to drive a side wall forming piece to move towards the end away from a forming cavity, synchronous demolding on the two sides is achieved, and the space on the two sides of a plastic piece is opened; and the plastic part does not need to be ejected through an ejector rod, so that the plastic part is prevented from being strained or ejected to deform, and the surface quality of the plastic part is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to an injection mold for refrigerator drawer covers with unequal wall thicknesses based on a pre-deformation control technology. Background Art

[0002] Refrigerator drawer covers are partitioned drawers used to store fruits and vegetables within the refrigerator. They are typically made of plastic and are injection-molded using a mold. Because these drawer covers need to be pulled out and extended during use, they require thicker end walls for better isolation. Currently, most refrigerator drawers require an ejector rod to eject the molded part after injection molding. This can easily lead to damage or deformation during ejection, affecting the surface quality. Therefore, there is an urgent need to design an injection mold for refrigerator drawer covers with unequal wall thicknesses based on pre-deformation control technology that can overcome these drawbacks.

[0003] In order to overcome the shortcomings of the existing technology, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses an injection mold for processing refrigerator drawer masks with complex structures [application number: 201822158824.8]. The mold includes an upper mold and a lower mold. The upper and lower molds are precisely positioned by positioning columns and positioning holes located in the upper and lower molds. The upper mold and the lower mold are joined to form a mold cavity. A mold core is arranged in the mold cavity. An injection nozzle is arranged on the top of the upper mold to connect to the mold cavity. The injection mold also includes an ejector pin for ejecting the molded product and a slider for forming a mask buckle position. The ejector pin is arranged on a movable top plate, and the movable top plate is located above the upper mold. The slider is located at the docking interface of the upper and lower molds. A slide groove is provided on the docking interface between the upper and lower molds corresponding to the slider. After the product is formed, the slider moves to avoid and then ejects the molded product through the ejector pin. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems and provide an injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A refrigerator drawer cover injection mold with unequal wall thickness based on pre-deformation control technology, comprising a refrigerator drawer cover molding lower mold and a refrigerator drawer cover molding upper mold, an injection diverter is provided above the refrigerator drawer cover molding upper mold, a drawer cover main body molding protrusion is provided in the refrigerator drawer cover molding upper mold, a drawer cover main body molding bottom plate, an end thick-wall molding part and a side wall molding part are provided on the refrigerator drawer cover molding lower mold, the drawer cover main body molding bottom plate, the end thick-wall molding part and the side wall molding part together form a molding cavity opening upward, the molding cavity corresponds to the position of the drawer cover main body molding protrusion and is matched in shape, and cylinder auxiliary demolding parts are provided on both sides of the refrigerator drawer cover molding lower mold for driving the side wall molding part to move toward or away from one end of the molding cavity.

[0007] In the above-mentioned unequal wall thickness refrigerator drawer cover injection mold based on pre-deformation control technology, the end thick-walled molded part includes an end thick-walled molded block arranged on the refrigerator drawer cover molding lower mold, and the end thick-walled molded block is provided with an end abutment anti-retreat part at one end away from the molding cavity.

[0008] In the above-mentioned unequal wall thickness refrigerator drawer cover injection mold based on pre-deformation control technology, the end abutment anti-retreat part includes an end abutment anti-retreat platform arranged at one end of the end thick-walled forming block away from the forming cavity, and the end abutment anti-retreat platform abuts and cooperates with the end thick-walled forming block.

[0009] In the above-mentioned unequal wall thickness refrigerator drawer cover injection mold based on pre-deformation control technology, the side wall forming part includes two side wall forming blocks arranged on the refrigerator drawer cover forming lower mold, and the side wall forming blocks are abutted and matched with the end thick wall forming blocks.

[0010] In the above-mentioned unequal wall thickness refrigerator drawer cover injection mold based on pre-deformation control technology, the drawer cover main body molding bottom plate is inclined, and the depth of the side wall molding block gradually decreases from close to to away from the end thick wall molding block.

[0011] In the above-mentioned injection mold for refrigerator drawer cover with unequal wall thickness based on pre-deformation control technology, the cylinder auxiliary demolding part includes cylinders arranged on both sides of the refrigerator drawer cover molding lower mold, and the power shaft of the cylinder is connected to the side wall molding block.

[0012] In the above-mentioned injection mold for refrigerator drawer cover with unequal wall thickness based on pre-deformation control technology, cylinder fixing bases are provided on both sides of the refrigerator drawer cover molding lower mold, and the cylinder fixing bases are fixedly connected to the cylinder.

[0013] In the above-mentioned injection mold for refrigerator drawer cover with unequal wall thickness based on pre-deformation control technology, the injection diverter component includes an injection main board and an injection diverter plate arranged above the refrigerator drawer cover molding upper mold.

[0014] In the above-mentioned injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology, a cooling pipeline for the upper surface of the plastic part is provided in the molding protrusion of the drawer cover body.

[0015] In the above-mentioned injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology, a cooling pipeline for the lower surface of the plastic part is provided in the molding bottom plate of the drawer cover main body.

[0016] Compared with the existing technology, the advantages of this utility model are:

[0017] 1. During the injection molding process, the utility model brings the refrigerator drawer cover molding lower mold and the refrigerator drawer cover molding upper mold close to each other, so that the drawer cover main body molding protrusion enters the molding cavity surrounded by the drawer cover main body molding bottom plate, the end thick-wall molding part and the side wall molding part to form a complete cavity. The molten material is injection-molded and diverted through the injection molding diverter. A combined molding module is used to mold refrigerator fruit and vegetable box drawer covers with larger end depth and wall thickness and smaller wall thickness on both sides. No secondary processing is required. After the injection molding is completed, the mold is opened, and the side wall molding part is driven to move away from the molding cavity end by the oil cylinder auxiliary demoulding part to achieve synchronous demoulding on both sides, open the space on both sides of the plastic part, and there is no need to eject the plastic part through the ejector rod, so as to prevent the plastic part from being pulled or deformed by ejection, thereby ensuring the surface quality of the plastic part.

[0018] 2. After the injection molding is completed, the utility model passes the cooling water into the cooling pipe on the upper surface of the plastic part to cool the upper surface of the plastic part in a large area, and passes the cooling water into the cooling pipe on the lower surface of the plastic part to cool the lower surface of the plastic part in a large area, thereby realizing synchronous cooling of the upper and lower surfaces and achieving good cooling effect.

[0019] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a partial structural diagram of the utility model.

[0022] Figure 3 It is a partial structural diagram of the utility model in another direction.

[0023] Figure 4 It is a partial structural diagram of the utility model in another direction.

[0024] Figure 5 It is a structural schematic diagram of the upper mold for forming the refrigerator drawer cover.

[0025] In the figure: refrigerator drawer cover molding lower mold 1, refrigerator drawer cover molding upper mold 2, injection molding diverter part 3, drawer cover main body molding protrusion 4, drawer cover main body molding bottom plate 5, end thick-wall molding part 6, side wall molding part 7, molding cavity 8, cylinder auxiliary demoulding part 81, end thick-wall molding block 9, end abutment anti-retreat part 10, end abutment anti-retreat platform 11, side wall molding block 12, cylinder 13, cylinder fixed base 14, injection molding main board 15, injection molding diverter plate 16, plastic part upper surface cooling pipeline 17, plastic part lower surface cooling pipeline 18. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-5 As shown, an injection mold for refrigerator drawer covers of unequal wall thickness based on pre-deformation control technology includes a refrigerator drawer cover molding lower mold 1 and a refrigerator drawer cover molding upper mold 2, an injection diverter 3 is provided above the refrigerator drawer cover molding upper mold 2, a drawer cover main body molding protrusion 4 is provided in the refrigerator drawer cover molding upper mold 2, a drawer cover main body molding bottom plate 5, an end thick-wall molding part 6 and a side wall molding part 7 are provided on the refrigerator drawer cover molding lower mold 1, the drawer cover main body molding bottom plate 5, the end thick-wall molding part 6 and the side wall molding part 7 together form a molding cavity 8 opening upward, the molding cavity 8 corresponds to the position of the drawer cover main body molding protrusion 4 and is adapted in shape, and cylinder auxiliary demolding parts 81 for driving the side wall molding part 7 to move toward or away from one end of the molding cavity 8 are provided on both sides of the refrigerator drawer cover molding lower mold 1.

[0028] In this embodiment, during the injection molding process, the refrigerator drawer cover molding lower mold 1 and the refrigerator drawer cover molding upper mold 2 are brought close to each other, so that the drawer cover main body molding protrusion 4 enters the molding cavity 8 surrounded by the drawer cover main body molding bottom plate 5, the end thick-wall molding part 6 and the side wall molding part 7 to form a complete cavity. The molten material is injection-molded and diverted through the injection molding diverter 3. A combined molding module is used to mold a refrigerator fruit and vegetable box drawer cover with a larger end depth and wall thickness and a smaller wall thickness on both sides. No secondary processing is required. After the injection molding is completed, the mold is opened, and the side wall molding part 7 is driven to move away from the molding cavity 8 by the oil cylinder auxiliary demoulding part 81 to achieve synchronous demoulding on both sides, open the space on both sides of the plastic part, and there is no need to eject the plastic part through the ejector rod, prevent the plastic part from being pulled or ejected and deformed, and ensure the surface quality of the plastic part.

[0029] Combine Figure 1-5 As shown, the end thick-walled molding part 6 includes an end thick-walled molding block 9 arranged on the refrigerator drawer cover molding lower mold 1, and the end thick-walled molding block 9 is provided with an end abutment anti-retraction part 10 at one end away from the molding cavity 8.

[0030] Specifically, during the injection molding process, the end thick-walled molding block 9 cooperates with the drawer cover main body molding protrusion 4 to form the end thick-walled structure of the plastic part, and the end abutment anti-retreat part 10 plays a role in abutting and preventing the end thick-walled molding block 9, thereby ensuring the accuracy of the end wall thickness during injection molding.

[0031] Combine Figure 1 、 Figure 3 As shown, the end abutment anti-retreat member 10 includes an end abutment anti-retreat platform 11 provided at one end of the end thick-walled forming block 9 away from the forming cavity 8 , and the end abutment anti-retreat platform 11 abuts and cooperates with the end thick-walled forming block 9 .

[0032] In this embodiment, the end abutment and anti-retraction stand 11 plays a role in abutting and preventing the end thick-walled forming block 9 from retreating, thereby ensuring the accuracy of the end wall thickness during injection molding.

[0033] The side wall forming part 7 includes two side wall forming blocks 12 arranged on the refrigerator drawer cover forming lower mold 1, the side wall forming blocks 12 are abutted and matched with the end thick-wall forming block 9, and the drawer cover main body forming bottom plate 5 is inclined. The depth of the side wall forming block 12 gradually decreases from close to to away from the end thick-wall forming block 9.

[0034] In this embodiment, during the injection molding process, the side wall forming blocks 12 are used to form the thin-wall structures on both sides of the plastic part, and the drawer cover main body forming bottom plate 5 is set at an angle. The depth of the side wall forming blocks 12 gradually decreases from close to one end toward away from the end thick-wall forming block 9, forming a side wall structure with gradually decreasing depth on both sides.

[0035] The cylinder auxiliary demolding part 81 includes a cylinder 13 arranged on both sides of the refrigerator drawer cover forming lower mold 1, the power shaft of the cylinder 13 is connected to the side wall forming block 12, and a cylinder fixed base 14 is provided on both sides of the refrigerator drawer cover forming lower mold 1, and the cylinder fixed base 14 is fixedly connected to the cylinder 13.

[0036] In this embodiment, when the side wall forming block 12 needs to be moved, the oil cylinder 13 can be started, and the degree of automation is relatively high. The oil cylinder fixing base 14 is used to fix the oil cylinder 13.

[0037] Combine Figure 1-2 As shown, the injection molded diverter 3 includes an injection molded main board 15 and an injection molded diverter plate 16 which are arranged above the refrigerator drawer cover molding upper mold 2.

[0038] In this embodiment, during injection molding, the molten material is injection-diverted through the injection molding main board 15 and the injection molding diverter plate 16 .

[0039] Combine Figure 1-5As shown, a plastic upper surface cooling pipeline 17 is provided in the drawer cover main body molding protrusion 4.

[0040] In this embodiment, after the injection molding is completed, cooling water is introduced into the cooling pipe 17 on the upper surface of the plastic part to perform large-area cooling on the upper surface of the plastic part.

[0041] Combine Figure 4 As shown, a cooling pipeline 18 for the lower surface of the plastic part is provided in the molding bottom plate 5 of the drawer cover body.

[0042] In this embodiment, after the injection molding is completed, cooling water is introduced into the cooling pipe 18 on the lower surface of the plastic part to perform large-area cooling on the lower surface of the plastic part.

[0043] The working principle of this utility model is:

[0044] During the injection molding process, the refrigerator drawer cover molding lower mold 1 and the refrigerator drawer cover molding upper mold 2 are brought close to each other, so that the drawer cover main body molding protrusion 4 enters the molding cavity 8 surrounded by the drawer cover main body molding bottom plate 5, the end thick-wall molding block 9 and the side wall molding block 12 to form a complete mold cavity. The molten material is injection-molded and diverted through the injection molding main board 15 and the injection molding diverter plate 16. A combined molding module is used to mold the refrigerator fruit and vegetable box drawer cover with a larger end depth and wall thickness and a smaller wall thickness on both sides. No secondary processing is required. After the injection molding is completed, the mold is opened, and the side wall molding block 12 is driven by the oil cylinder 13 to move away from the molding cavity 8 to achieve synchronous demoulding on both sides, open the space on both sides of the plastic part, and do not need to be ejected by the ejector rod to prevent the plastic part from being pulled or ejected and deformed, thereby ensuring the surface quality of the plastic part.

[0045] During the injection molding process, the end thick-walled forming block 9 cooperates with the drawer cover main body forming protrusion 4 to form the end thick-walled structure of the plastic part. The end abutment and anti-retraction stand 11 plays a role in abutting and preventing the end thick-walled forming block 9 from retreating, ensuring the accuracy of the end wall thickness during injection molding.

[0046] During the injection molding process, the side wall forming blocks 12 are used to form the thin-walled structures on both sides of the plastic part. The drawer cover main body forming bottom plate 5 is set at an angle. The depth of the side wall forming blocks 12 gradually decreases from close to the end of the thick-wall forming block 9 to the end away from the end, forming a side wall structure with gradually decreasing depth on both sides.

[0047] When the side wall forming block 12 needs to be moved, the oil cylinder 13 can be started, and the degree of automation is high. The oil cylinder fixing base 14 is used to fix the oil cylinder 13.

[0048] After the injection molding is completed, the cooling water is passed into the cooling pipe 17 on the upper surface of the plastic part to cool the upper surface of the plastic part in a large area, and the cooling water is passed into the cooling pipe 18 on the lower surface of the plastic part to cool the lower surface of the plastic part in a large area, thereby achieving synchronous cooling of the upper and lower surfaces and achieving good cooling effect.

[0049] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the spirit of the present invention.

[0050] Although this article frequently uses terms such as refrigerator drawer cover molding lower mold 1, refrigerator drawer cover molding upper mold 2, injection molding diverter 3, drawer cover main body molding protrusion 4, drawer cover main body molding bottom plate 5, end thick-wall molding part 6, side wall molding part 7, molding chamber 8, oil cylinder auxiliary demoulding part 81, end thick-wall molding block 9, end abutment anti-recoil part 10, end abutment anti-recoil stand 11, side wall molding block 12, oil cylinder 13, oil cylinder fixed base 14, injection molding main board 15, injection molding diverter plate 16, plastic part upper surface cooling pipeline 17, plastic part lower surface cooling pipeline 18, etc., it does not exclude the possibility of using other terms. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention. Interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. An injection mold for refrigerator drawer cover with unequal wall thickness based on pre-deformation control technology, comprising a refrigerator drawer cover molding lower mold (1) and a refrigerator drawer cover molding upper mold (2), characterized in that: An injection molding diverter (3) is provided above the refrigerator drawer cover molding upper mold (2), a drawer cover main body molding protrusion (4) is provided inside the refrigerator drawer cover molding upper mold (2), and a drawer cover main body molding bottom plate (5), an end thick-wall molding part (6) and a side wall molding part (7) are provided on the refrigerator drawer cover molding lower mold (1). The drawer cover main body molding bottom plate (5), the end thick-wall molding part (6) and the side wall molding part (7) together form a molding chamber (8) with an upward opening, and the molding chamber (8) corresponds to the position of the drawer cover main body molding protrusion (4) and has a shape that matches the position of the drawer cover main body molding protrusion (4). Cylinder auxiliary demoulding parts (81) for driving the side wall molding part (7) to move toward or away from one end of the molding chamber (8) are provided on both sides of the refrigerator drawer cover molding lower mold (1).

2. The unequal wall thickness refrigerator drawer cover injection mold based on pre-deformation control technology according to claim 1 is characterized in that: The end thick-walled molding part (6) comprises an end thick-walled molding block (9) arranged on the refrigerator drawer cover molding lower mold (1), and the end thick-walled molding block (9) is provided with an end abutment anti-retraction part (10) at one end away from the molding chamber (8).

3. The injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology according to claim 2 is characterized in that: The end abutment anti-retraction member (10) comprises an end abutment anti-retraction stand (11) arranged at one end of the end thick-walled forming block (9) away from the forming chamber (8), and the end abutment anti-retraction stand (11) is in abutment with the end thick-walled forming block (9).

4. The injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology according to claim 3 is characterized in that: The side wall forming part (7) comprises two side wall forming blocks (12) arranged on the refrigerator drawer cover forming lower mold (1), and the side wall forming blocks (12) are in abutment with the end thick wall forming blocks (9).

5. The injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology according to claim 4 is characterized in that: The drawer cover main body forming bottom plate (5) is arranged in an inclined manner, and the depth of the side wall forming block (12) gradually decreases from close to one end to away from the end thick wall forming block (9).

6. The injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology according to claim 5, characterized in that: The oil cylinder auxiliary demoulding part (81) comprises oil cylinders (13) arranged on both sides of the refrigerator drawer cover forming lower mold (1), and the power shaft of the oil cylinder (13) is connected to the side wall forming block (12).

7. The injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology according to claim 6, characterized in that: Oil cylinder fixing bases (14) are provided on both sides of the refrigerator drawer cover forming lower mold (1), and the oil cylinder fixing bases (14) are fixedly connected to the oil cylinder (13).

8. The injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology according to claim 7, characterized in that: The injection molded flow diverter (3) comprises an injection molded main board (15) and an injection molded flow diverter plate (16) arranged above the refrigerator drawer cover molding upper mold (2).

9. The injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology according to claim 8, characterized in that: A plastic upper surface cooling pipeline (17) is provided in the drawer cover main body molding protrusion (4).

10. The injection mold for refrigerator drawer covers with unequal wall thickness based on pre-deformation control technology according to claim 9, characterized in that: A plastic lower surface cooling pipeline (18) is provided in the drawer cover main body molding bottom plate (5).

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