A mold for producing plastic cups with external threads

Abstract

The utility model relates to the technical field of cup body injection molding tools, and provides a mold for producing plastic cups with external threads, including: a fixed mold assembly, on which an outer cavity block is arranged, and a cavity is arranged on the outer cavity block; a movable mold assembly, which is movably matched with the fixed mold assembly, and an inner cavity block is arranged on the movable mold assembly, and the inner cavity block is movably inserted in the cavity; an ejection assembly, which is arranged on the movable mold assembly, and the ejection assembly has: a cavity insert, a cavity insert; a guide rod, which is obliquely inserted on the movable mold assembly; a push rod, which is movably arranged in the movable mold assembly; a cooling assembly, which has a first cooling water channel and a second cooling water channel. Compared with the prior art, the utility model has the advantage that by using an obliquely arranged guide rod on the movable mold assembly, when the cavity insert moves along the guide direction under the drive of the push rod, a component force perpendicular to the direction is generated, ensuring that the cavity insert can translate along the radial direction of the plastic cup, and satisfactorily perform the demoulding operation of the plastic cup.

Description

Technical Field

[0001] The utility model relates to the technical field of cup body injection molding tools, in particular to a mold for producing plastic cups with external threads. Background Art

[0002] like Figure 1 The plastic cup sample shown has an external thread 2 on the top. In the design of traditional injection molds, in order to facilitate the separation of the external thread 2 from the molding cavity, transmission elements such as gears and racks are usually integrated into the mold. This design is intended to rotate the cup body 1 relative to the molding cavity through these transmission mechanisms when the cup body 1 is demolded, thereby achieving smooth demolding. Although this method can effectively separate the threaded parts from the molding cavity, the introduction of gear, rack structure and corresponding drive device not only significantly increases the initial production cost of the injection mold, but also increases the cost burden of subsequent maintenance, repair and even replacement of the mold. In addition, given that the wall thickness of the cup body 1 is about 1 mm, the conventional method of traditional injection molds is to drill holes inside the mold to construct cooling water channels. However, this cooling water channel is difficult to quickly extract heat from the molding cavity. Therefore, the cooling time required for the cup body 1 in the molding cavity is forced to be extended, which indirectly pushes up the production cost of plastic cups. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a mold for producing plastic cups with external threads in view of the current status of the prior art.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: a mold for producing a plastic cup with external threads is proposed, the plastic cup has a cup body and an external thread arranged on the cup body, and the mold comprises:

[0005] A fixed mold assembly, on which an outer cavity block is arranged, and the outer cavity block is provided with a cavity;

[0006] A movable mold assembly is movably matched with the fixed mold assembly, the movable mold assembly is provided with an inner mold cavity block, the inner mold cavity block is movably inserted in the cavity, and when the movable mold assembly is fitted with the fixed mold assembly, a first molding cavity is formed between the cavity and the inner mold cavity block, and the first molding cavity is used to mold the cup body;

[0007] An ejector assembly is arranged on the movable mold assembly, and the ejector assembly comprises: at least two cavity inserts distributed in a circle, a second molding cavity is formed between at least two of the cavity inserts, and the second molding cavity is connected with the first molding cavity for molding the external thread; a guide rod is obliquely inserted on the movable mold assembly, the cavity insert is fixedly sleeved on the guide rod, and each of the cavity inserts corresponds to at least one guide rod; a push rod is movably arranged in the movable mold assembly, and each of the cavity inserts corresponds to one push rod, and the push rod is used to push the cavity insert to move along the axial direction of the guide rod, so that at least two of the cavity inserts are close to or away from each other;

[0008] The cooling assembly comprises a first cooling water channel arranged on the outer cavity block and wrapped around the outer side of the cavity, and a second cooling water channel arranged in the inner cavity block.

[0009] In the above-mentioned mold for producing plastic cups with external threads, the push rod is connected to a limiting column, an elliptical hole is provided on the cavity insert, the limiting column is located in the elliptical hole, and the limiting column is used to provide a limit for the movement of the cavity insert.

[0010] In the above-mentioned mold for producing plastic cups with external threads, four cavity inserts are provided, and two guide rods are provided on each cavity insert.

[0011] In the above-mentioned mold for producing plastic cups with external threads, a mounting groove is provided on the outer wall of the guide rod, and a mounting hole connected to the mounting groove is provided on the cavity insert. A connecting pin is inserted in the mounting hole, and the end of the connecting pin is inserted into the mounting groove to fix the guide rod on the cavity insert.

[0012] In the above-mentioned mold for producing a plastic cup with an external thread, a guide sleeve is fixed on the movable mold assembly, and the guide rod is inserted in the guide sleeve to provide guidance for the movement of the guide rod.

[0013] In the above-mentioned mold for producing a plastic cup with an external thread, the cooling assembly comprises:

[0014] A first spiral groove is arranged on the outer side of the outer cavity block, and the first cooling water channel is formed between the first spiral groove and the fixed mold assembly;

[0015] A cooling column is inserted in the inner cavity block, a second spiral groove is arranged on the outer side of the cooling column, and the second cooling water channel is formed between the second spiral groove and the inner cavity block.

[0016] In the above-mentioned mold for producing a plastic cup with external threads, the ejector assembly includes:

[0017] A push rod fixing plate, which is movably arranged on the movable mold assembly, and the push rod is connected to the push rod fixing plate hanging platform;

[0018] A push plate is movably abutted against the push rod, and the end of the push rod is tightly abutted against the push plate.

[0019] Compared with the prior art, the advantage of the present invention lies in that by adopting an obliquely arranged guide rod on the movable mold assembly, when the cavity insert moves along the guide direction under the drive of the push rod, a component force perpendicular to the direction is generated, ensuring that the cavity insert can translate radially along the plastic cup and successfully perform the demolding operation of the plastic cup. In addition, the cooling system in the present design effectively reduces the cooling time of the plastic cup due to the ingenious arrangement of the first and second cooling water channels inside and outside the plastic cup, significantly enhancing production efficiency while reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional image of a plastic cup;

[0021] Figure 2 It is a three-dimensional diagram of the mold of this scheme;

[0022] Figure 3 It is a plan view of the mold of this scheme;

[0023] Figure 4 yes Figure 3 Sectional view along AA direction;

[0024] Figure 5 yes Figure 3 Cross-sectional view along the BB direction;

[0025] Figure 6 It is a three-dimensional diagram of the movable mold assembly;

[0026] Figure 7 yes Figure 6 A three-dimensional diagram of the structure of the middle part;

[0027] Figure 8 It is a three-dimensional diagram of the fixed mold assembly;

[0028] Fig. 9 It is a three-dimensional diagram of the outer cavity block.

[0029] In the figure, 1, cup body; 2, external thread; 3, fixed mold assembly; 4, external cavity block; 5, cavity; 6, movable mold assembly; 7, internal cavity block; 8, first molding cavity; 9, ejector assembly; 10, cavity insert; 11, second molding cavity; 12, guide rod; 13, push rod; 14, cooling assembly; 15, first cooling water channel; 16, second cooling water channel; 17, limiting column; 18, elliptical hole; 19, mounting groove; 20, mounting hole; 21, guide sleeve; 22, first spiral groove; 23, cooling column; 24, second spiral groove; 25, push rod fixing plate; 26, push plate. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0031] A mold for producing a plastic cup with an external thread, the plastic cup having a cup body 1 and an external thread 2 arranged on the cup body 1, the mold comprising: a fixed mold component 3, on which an external cavity block 4 is arranged, and a cavity 5 is arranged on the external cavity block 4; a movable mold component 6, which is movably matched with the fixed mold component 3, and an inner cavity block 7 is arranged on the movable mold component 6, and the inner cavity block 7 is movably inserted in the cavity 5, and when the movable mold component 6 is fitted with the fixed mold component 3, a first molding cavity 8 is formed between the cavity 5 and the inner cavity block 7, and the first molding cavity 8 is used to mold the cup body 1; an ejector component 9, which is arranged on the movable mold component 6, and the ejector component 9 has: at least two cavity inserts 10 distributed in a circle, and a second molding cavity is formed between the at least two cavity inserts 10 11, the second molding cavity 11 is connected to the first molding cavity 8 for molding the external thread 2; the guide rod 12, which is obliquely inserted on the movable mold assembly 6, the cavity insert 10 is fixedly sleeved on the guide rod 12 and each cavity insert 10 corresponds to at least one guide rod 12; the push rod 13, which is movably arranged in the movable mold assembly 6, each cavity insert 10 corresponds to one push rod 13, the push rod 13 is used to push the cavity insert 10 to move along the axial direction of the guide rod 12, so that at least two cavity inserts 10 are closer to or farther away from each other; the cooling assembly 14, which has a first cooling water channel 15 arranged on the outer cavity block 4 and wrapped around the outside of the cavity 5, and a second cooling water channel 16 arranged in the inner cavity block 7.

[0032] Based on the above embodiments, an exemplary structure of this solution is as follows: Figures 2 to 9 As shown, there are four cavity inserts 10, each of which is fixedly equipped with two guide rods 12 and a push rod 13. The movable mold assembly 6 and the fixed mold assembly 3 are respectively installed on the movable part and the fixed part of the injection molding machine. By driving the movable part of the injection molding machine, the movable mold assembly 6 moves closer to or away from the fixed mold assembly 3 to complete the closing and opening process of the injection mold.

[0033] After the mold is closed, the injection molding machine injects the molten plastic into the first molding cavity 8 and the second molding cavity 11. The cooling system is equipped with a first cooling water channel 15 and a second cooling water channel 16, which respectively rapidly cool the cup body 1 and the external thread 2 in the first molding cavity 8 and the second molding cavity 11. It is worth noting that the first cooling water channel 15 is arranged around the outer wall of the plastic cup, while the second cooling water channel 16 is placed inside the plastic cup. Such a design of the cooling component 14 accelerates the cooling rate of the plastic cup after molding, thereby shortening the molding cycle of the plastic cup in the mold and improving production efficiency.

[0034] When the movable part of the injection molding machine drives the movable mold assembly 6 to separate from the fixed mold assembly 3, that is, after the mold is opened, the push rod 13 of the ejector assembly 9 first acts on the four cavity inserts 10, prompting them to move toward the fixed mold assembly 3. Since the guide rod 12 is installed on the movable mold assembly 6 in an oblique manner, the cavity insert 10 will slide along the axial direction of the guide rod 12 when moving, resulting in lateral displacement, prompting the four cavity inserts 10 to disperse, so that the external thread 2 can smoothly separate from the second molding cavity 11 surrounded by the cavity inserts 10, and the plastic cup can be demoulded.

[0035] This solution uses an obliquely arranged guide rod 12 on the movable mold assembly 6. Under the drive of the push rod 13, the guide rod 12 is set to ensure that the cavity insert 10 can translate along the radial direction of the plastic cup, and successfully perform the demoulding operation of the plastic cup. In addition, the cooling assembly 14 in this design has a first cooling water channel 15 and a second cooling water channel 16 cleverly arranged inside and outside the plastic cup, which effectively shortens the cooling time of the plastic cup, significantly enhances production efficiency, and reduces manufacturing costs.

[0036] The push rod 13 is connected to a limiting column 17 . The cavity insert 10 is provided with an elliptical hole 18 . The limiting column 17 is located in the elliptical hole 18 . The limiting column 17 is used to provide a limit for the movement of the cavity insert 10 .

[0037] like Figure 4 and Figure 5 As shown, at this time, the mold is in a mold-closing state, the outer wall of the limit column 17 is against the left wall of the elliptical hole 18, and there is a gap between the outer wall of the limit column 17 and the right wall of the elliptical hole 18. When the mold is opened, the push rod 13 pushes the cavity insert 10 to move, and the cavity insert 10 drives the guide rod 12 along Figure 4 At this time, the limiting column 17 and the left side of the elliptical hole 18 gradually move away from each other and the gap between the limiting column 17 and the right side of the elliptical hole 18 slowly decreases. After the push rod 13 stops moving, the right side wall of the limiting column 17 abuts against the right side wall of the elliptical hole 18, and the cavity insert 10 moves to the preset position.

[0038] Preferably, a mounting groove 19 is provided on the outer wall of the guide rod, and a mounting hole 20 connected to the mounting groove 19 is provided on the cavity insert 10. A connecting pin is inserted into the mounting hole 20, and the end of the connecting pin is inserted into the mounting groove 19 to fix the guide rod 12 on the cavity insert 10.

[0039] Preferably, a guide sleeve 21 is fixed on the movable mold assembly 6 , and the guide rod 12 is inserted into the guide sleeve 21 to provide guidance for the movement of the guide rod 12 .

[0040] The cooling assembly 14 includes: a first spiral groove 22 arranged on the outer side of the outer cavity block 4, and a first cooling water channel 15 is formed between the first spiral groove 22 and the fixed mold assembly 3; a cooling column 23, which is inserted into the inner cavity block 7, and a second spiral groove 24 is arranged on the outer side of the cooling column 23, and a second cooling water channel 16 is formed between the second spiral groove 24 and the inner cavity block 7.

[0041] The ejector assembly 9 includes: a push rod fixing plate 25, which is movably arranged on the movable mold assembly 6, and the push rod 13 is connected to the push rod fixing plate 25; a push plate 26, which is movably abutted against the push rod 13, and the end of the push rod 13 is tightly pressed against the push plate 26. The push plate 26 is connected to the driving structure of the injection molding machine, and the push plate 26 is pushed to move on the movable mold assembly 6 by the structure of the injection molding machine to realize the movement of the push rod 13.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] 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 in similar ways, but they will not deviate from the scope defined by the spirit of the present invention.

Claims

1. A mold for producing a plastic cup with external threads, the plastic cup having a cup body and external threads arranged on the cup body, characterized in that: The mold comprises: A fixed mold assembly, on which an outer cavity block is arranged, and the outer cavity block is provided with a cavity; A movable mold assembly is movably matched with the fixed mold assembly, the movable mold assembly is provided with an inner mold cavity block, the inner mold cavity block is movably inserted in the cavity, and when the movable mold assembly is fitted with the fixed mold assembly, a first molding cavity is formed between the cavity and the inner mold cavity block, and the first molding cavity is used to mold the cup body; An ejector assembly is arranged on the movable mold assembly, and the ejector assembly comprises: at least two cavity inserts distributed in a circle, a second molding cavity is formed between at least two of the cavity inserts, and the second molding cavity is connected with the first molding cavity for molding the external thread; a guide rod is obliquely inserted on the movable mold assembly, the cavity insert is fixedly sleeved on the guide rod, and each of the cavity inserts corresponds to at least one guide rod; a push rod is movably arranged in the movable mold assembly, and each of the cavity inserts corresponds to one push rod, and the push rod is used to push the cavity insert to move along the axial direction of the guide rod, so that at least two of the cavity inserts are close to or away from each other; The cooling assembly comprises a first cooling water channel arranged on the outer cavity block and wrapped around the outer side of the cavity, and a second cooling water channel arranged in the inner cavity block.

2. A mold for producing a plastic cup with external threads as claimed in claim 1, characterized in that: The push rod is connected to a limiting column, the cavity insert is provided with an elliptical hole, the limiting column is located in the elliptical hole, and the limiting column is used to provide a limit for the movement of the cavity insert.

3. A mold for producing a plastic cup with external threads as claimed in claim 1, characterized in that: The cavity inserts are provided with four, and each of the cavity inserts is provided with two guide rods.

4. A mold for producing a plastic cup with external threads as claimed in claim 1, characterized in that: A mounting groove is provided on the outer wall of the guide rod, and a mounting hole connected to the mounting groove is provided on the cavity insert. A connecting pin is inserted into the mounting hole, and the end of the connecting pin is inserted into the mounting groove to fix the guide rod on the cavity insert.

5. A mold for producing a plastic cup with external threads as claimed in claim 1, characterized in that: A guide sleeve is fixed on the movable mold assembly, and the guide rod is inserted into the guide sleeve to provide guidance for the movement of the guide rod.

6. A mold for producing a plastic cup with external threads as claimed in claim 1, characterized in that: The cooling assembly comprises: A first spiral groove is arranged on the outer side of the outer cavity block, and the first cooling water channel is formed between the first spiral groove and the fixed mold assembly; A cooling column is inserted in the inner cavity block, a second spiral groove is arranged on the outer side of the cooling column, and the second cooling water channel is formed between the second spiral groove and the inner cavity block.

7. A mold for producing a plastic cup with external threads as claimed in claim 1, characterized in that: The ejection assembly comprises: A push rod fixing plate, which is movably arranged on the movable mold assembly, and the push rod is connected to the push rod fixing plate hanging platform; A push plate is movably abutted against the push rod, and the end of the push rod is tightly abutted against the push plate.

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