Lunch box injection mold

Abstract

The utility model discloses a lunch box injection mold, and relates to the technical field of mold design. The lunch box injection mold comprises a hollow bottom plate, a nozzle is connected to the middle of the interior of the bottom plate through threads, a fixed mold is arranged at the upper end of the bottom plate, the interior of the fixed mold is an outwards-inclined opening, positioning holes are formed in the four corners of the interior of the fixed mold and the bottom plate, and a movable mold is arranged at the upper end of the fixed mold; the middle of the lower surface of the movable mold is provided with a movable mold core with the same angle as the internal opening of the fixed mold, four corners of the lower surface of the movable mold are provided with guide columns, the guide columns are in insertion fit with the positioning holes, the outer sides of the lower ends of the guide columns are sleeved with meal box upper edge molds, and the periphery of the outer side of the upper end opening of the fixed mold is connected with a meal box upper edge mold II; a push plate is arranged at the upper end of the movable mold, ejector rods are connected to the left and right sides of the push plate in an inserted mode, the diameter of the upper ends of the ejector rods is larger than that of holes in the left and right sides of the push plate, and the lower ends of the ejector rods penetrate through the movable mold to be fixedly connected with the left and right sides of the lunch box upper edge mold.

Description

Technical Field

[0001] The utility model relates to the technical field of mold design, in particular to an injection mold for a lunch box. Background Art

[0002] Molds are various molds and tools used in industrial production to obtain the desired products by injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and other methods. In short, molds are tools used to make molded objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the object by changing the physical state of the molded material. After the existing lunch box is injection molded, it is necessary to eject the lunch box from the punch through a push rod. During the ejection process, since the lunch box has just been finalized and is easy to deform, when it is ejected by the push rod, it will cause a depression in the position where it is pushed, resulting in the production of defective products. Therefore, a lunch box injection mold is designed to solve the above problem. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a lunch box injection mold, which solves the problem that the top of the lunch box is easily deformed by a push rod during the lunch box discharging process of the existing lunch box injection mold.

[0005] (II) Technical solution

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The utility model provides a lunch box injection mold, comprising: a bottom plate with a hollow interior, a nozzle connected by a thread in the middle of the bottom plate, a fixed mold arranged at the upper end of the bottom plate, an opening inclined outward in the fixed mold, a lunch box bottom edge groove arranged at the contact point between the bottom plate and the interior of the fixed mold, positioning holes arranged at four corners of the fixed mold and the interior of the bottom plate, a movable mold arranged at the upper end of the fixed mold, a movable mold core having the same angle as the opening in the fixed mold in the middle of the lower surface of the movable mold, guide pillars arranged at the four corners of the lower surface of the movable mold, the guide pillars inserted and matched with the positioning holes, a lunch box upper mold sleeved on the outer side of the lower end of the guide pillar, a lunch box upper mold 2 connected to the outer side of the upper opening of the fixed mold, a push plate arranged at the upper end of the movable mold, push rods inserted and connected on the left and right sides of the push plate, the upper end diameter of the push rods is larger than the diameter of the holes on the left and right sides of the push plate, and the lower end of the push rods passes through the movable mold and is fixedly connected to the left and right sides of the lunch box upper mold.

[0008] Preferably, the diameter of the upper end of the guide column is smaller than the diameter of the lower end, and the diameter of the guide column is the same as the inner diameter of the positioning hole.

[0009] Preferably, the guide pillar is longer than the movable mold.

[0010] Preferably, bosses are provided around the outer side of the upper surface of the connection between the upper mold of the lunch box and the guide pillar and around the outer side of the upper end of the guide pillar, and the thickness of the upper and lower bosses is the same as the thickness of the cylinder at the upper end of the movable mold core.

[0011] Preferably, springs are sleeved on the outer sides of the upper and lower bosses.

[0012] Preferably, the lower end of the nozzle is funnel-shaped, and an arc-shaped flow channel is provided inside the opening of the upper end of the nozzle, and the depth of the flow channel is less than the depth of the bottom groove of the lunch box.

[0013] Preferably, chamfers are provided at the opening of the upper end of the positioning hole and around the outer side of the lower end of the guide column.

[0014] (III) Beneficial effects

[0015] The utility model provides a lunch box injection mold, which has at least the following advantages compared with the prior art:

[0016] Beneficial effects:

[0017] The lunch box injection mold will push the upper mold of the lunch box forward when discharging the material and closing the mold for the next time, so that the plastic parts after shaping will fall off from the movable mold core, which is not easy to cause dents during ejection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a full cross-sectional view of the utility model;

[0020] Figure 3 This is a front end sectional view of the utility model;

[0021] Figure 4 It is a partial enlarged view of the utility model.

[0022] In the figure: 1. bottom plate; 2. nozzle; 3. fixed mold; 4. positioning hole; 5. movable mold; 6. movable mold core; 7. guide pillar; 8. lunch box upper mold; 9. lunch box upper mold 2; 10. push plate; 11. ejector rod; 21. boss; 22. spring; 23. flow channel outlet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments 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 in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-4 The utility model provides a technical solution: a lunch box injection mold, comprising: a bottom plate 1 with a hollow interior, a nozzle 2 is connected to the middle of the bottom plate 1 by a thread, a fixed mold 3 is arranged at the upper end of the bottom plate 1, the inside of the fixed mold 3 is an opening inclined outward, a lunch box bottom groove is arranged at the contact point between the bottom plate 1 and the inside of the fixed mold 3, positioning holes 4 are arranged at the four corners of the fixed mold 3 and the bottom plate 1, a movable mold 5 is arranged at the upper end of the fixed mold 3, and a movable mold 5 is arranged in the middle of the lower surface of the movable mold 5 with the same opening angle as that of the fixed mold 3. Ren 6, guide pillars 7 are provided at the four corners of the lower surface of the movable mold 5, the guide pillars 7 are inserted into the positioning holes 4, and the outer side of the lower end of the guide pillars 7 is sleeved with a lunch box upper mold 8, and the outer side of the upper opening of the fixed mold 3 is connected with a lunch box upper mold 9. A push plate 10 is provided on the upper end of the movable mold 5, and push rods 11 are inserted and connected on the left and right sides of the push plate 10. The upper end diameter of the push rod 11 is larger than the diameter of the holes on the left and right sides of the push plate 10, and the lower end of the push rod 11 passes through the movable mold 5 and is fixedly connected to the left and right sides of the lunch box upper mold 8.

[0025] When in use, the lunch box injection mold is installed on the injection molding machine. When closing the mold, the hydraulic cylinder will push the push plate 10, and the push plate 10 will push the movable mold 5 and the push rods 11 on the left and right sides to push together. When the guide column 7 is inserted into the positioning hole 4 for closing the mold, the lunch box upper mold 8 will fit together with the pushing movable mold 5 and the push plate 10, and the molten plastic will enter the gap between the fixed mold 3 and the movable mold 5, the lunch box upper mold 8, and the lunch box upper mold 9 through the nozzle 2. After heat preservation, pressure maintenance, cooling and molding, the mold is opened, and then the hydraulic rod will pull the push plate 10, and the countersunk holes on the left and right sides of the rear side of the push plate 10 will pull the push rod 11 backwards, and then the push rod 11 will pull the lunch box upper mold 8 backwards together. At this time, the lunch box upper mold 8 will pull the movable mold 5 backwards together. When the next mold closing is performed, the lunch box upper mold 8 will be pushed forward first, so that the processed lunch box falls out.

[0026] like Figure 1-3 As shown, the embodiment of the utility model provides an implementation method. Based on the above implementation method, the diameter of the upper end of the guide column 7 is smaller than the diameter of the lower end, and the diameter of the guide column 7 is the same as the inner diameter of the positioning hole 4.

[0027] It can be seen from the above structure that the upper mold 8 of the lunch box can be prevented from being pushed out excessively, so that the upper mold 8 of the lunch box is pushed out of the range of the guide pillar 7.

[0028] like Figure 1-3 As shown, the embodiment of the utility model provides an implementation method. Based on the above implementation method, the length of the guide column 7 is longer than the length of the movable mold 5.

[0029] From the analysis of the above structure, it can be known that the length of the guide pillar 7 is longer than the length of the movable mold 5. When the mold is closed, the guide pillar 7 will first be inserted into the positioning hole 4 for positioning.

[0030] like Figure 1-3 As shown, an embodiment of the utility model provides an implementation method. Based on the above implementation method, a boss 21 is provided on the outer side of the upper surface of the connection between the upper mold 8 of the lunch box and the guide column 7 and on the outer side of the upper end of the guide column 7. The thickness of the upper and lower bosses 21 is the same as the thickness of the upper cylinder of the movable mold core 6.

[0031] From the analysis of the above structure, it can be known that when the upper mold 8 of the lunch box is fitted with the movable mold 5, the movable mold core 6 and the upper mold 8 of the lunch box can be prevented from being deformed.

[0032] like Figure 1-3 As shown, the embodiment of the utility model provides an implementation method. Based on the above implementation method, springs 22 are sleeved on the outer sides of the upper and lower bosses 21.

[0033] From the analysis of the above structure, it can be known that when the upper mold 8 of the lunch box is pushed forward, the spring 22 can prevent the movable mold 5 from being pulled out together.

[0034] like Figure 1-4 As shown, an embodiment of the utility model provides an implementation method. Based on the above implementation method, the lower end of the nozzle 2 is funnel-shaped, and an arc-shaped flow channel 23 is provided inside the upper end opening of the nozzle 2. The depth of the flow channel 23 is less than the depth of the bottom edge groove of the lunch box.

[0035] From the analysis of the above structure, it can be known that the lower end of the nozzle 2 is funnel-shaped, and the arc-shaped runner opening 23 is opened inside the upper end of the nozzle 2. When the plastic is discharged, the pressure will increase, so that the molten plastic can better fill the mold cavity. At the same time, when taking it out, the diameter of the end of the runner opening 23 is smaller, which is convenient for pulling off the plastic part at the nozzle 2.

[0036] like Figure 1-3 As shown, the embodiment of the utility model provides an implementation method. Based on the above implementation method, the upper opening of the positioning hole 4 and the outer side of the lower end of the guide column 7 are both chamfered.

[0037] From the analysis of the above structure, it can be known that when the guide post 7 is inserted into the positioning hole 4, the chamfer around the outer side of the lower end of the guide post 7 and the upper end opening of the positioning hole 4 can play a guiding role to prevent the guide post 7 from being offset.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lunch box injection mold, characterized in that: include: A bottom plate (1) is hollow inside, a nozzle (2) is connected to the middle of the bottom plate (1) by a thread, a fixed mold (3) is arranged at the upper end of the bottom plate (1), the inside of the fixed mold (3) is an opening inclined outward, a bottom edge groove of a lunch box is provided at the contact point between the bottom plate (1) and the fixed mold (3), positioning holes (4) are provided at the four corners of the fixed mold (3) and the bottom plate (1), a movable mold (5) is arranged at the upper end of the fixed mold (3), a movable mold core (6) with the same opening angle as that of the fixed mold (3) is arranged in the middle of the lower surface of the movable mold (5), and the four corners of the lower surface of the movable mold (5) are provided. A guide post (7) is provided, and the guide post (7) is inserted and matched with the positioning hole (4). The lower end of the guide post (7) is sleeved with a lunch box upper mold (8). The upper end of the fixed mold (3) is connected to a lunch box upper mold (9) around the outer side of the upper opening. The upper end of the movable mold (5) is provided with a push plate (10). The left and right sides of the push plate (10) are inserted and connected with push rods (11). The upper end diameter of the push rod (11) is larger than the diameter of the holes on the left and right sides of the push plate (10). The lower end of the push rod (11) passes through the movable mold (5) and is fixedly connected to the left and right sides of the lunch box upper mold (8).

2. The lunch box injection mold according to claim 1, characterized in that: The diameter of the upper end of the guide column (7) is smaller than the diameter of the lower end, and the diameter of the guide column (7) is the same as the inner diameter of the positioning hole (4).

3. The lunch box injection mold according to claim 1, characterized in that: The length of the guide pillar (7) is longer than the length of the movable mold (5).

4. The lunch box injection mold according to claim 1, characterized in that: A boss (21) is provided around the outer side of the upper surface of the connection between the upper mold (8) of the lunch box and the guide pillar (7) and around the outer side of the upper end of the guide pillar (7). The thickness of the upper and lower bosses (21) is the same as the thickness of the upper cylinder of the movable mold core (6).

5. The lunch box injection mold according to claim 4, characterized in that: Springs (22) are sleeved on the outer sides of the upper and lower bosses (21).

6. The lunch box injection mold according to claim 1, characterized in that: The lower end of the nozzle (2) is funnel-shaped, and a circular arc-shaped flow channel (23) is provided inside the upper opening of the nozzle (2). The depth of the flow channel (23) is less than the depth of the bottom groove of the lunch box.

7. The lunch box injection mold according to claim 1, characterized in that: The upper opening of the positioning hole (4) and the outer side of the lower end of the guide column (7) are both chamfered.

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