Cup cover injection mold

Abstract

The utility model mainly relates to injection mold technical field, concretely relates to a cup cover injection mold, including base plate, the bottom fixed mounting of base plate top has lower mould seat, and the upper mould seat is equipped with in lower mould seat top, and the upper mould seat is connected with the lift drive mechanism for driving its reciprocating motion along the vertical direction, the top of lower mould seat is equipped with the circular cavity, and the bottom fixed mounting of upper mould seat has the mould core, and the mould core is arranged coaxially with circular cavity, and its radius is less than the radius of circular cavity, and the outer wall of mould core is equipped with the thread structure, and its top coaxial connection has the transmission shaft, and the transmission shaft is rotatably connected with upper mould seat. After injecting the molten plastic and cooling, the transmission shaft drives the mould core to rotate along the thread unwinding direction, and the lifting mechanism drives the upper mould seat to move up at the same time, makes the mould core spiral ascent in the rotation, realizes the nondestructive stripping of thread structure, avoids the damage caused by direct ejection.

Description

Technical Field

[0001] This utility model mainly relates to the field of injection mold technology, specifically to a cup lid injection mold. Background Technology

[0002] Injection molding is one of the most widely used processes in the manufacturing of plastic cup lids. Its basic principle is to use a mold to form a cavity that matches the shape of the product, inject molten plastic into the cavity, and after cooling and solidification, open the mold to obtain the desired product.

[0003] For cup lids with threaded structures, the mold typically includes a lower mold with a cavity and an upper mold with a forming thread core. In existing technology, a common demolding method is to directly separate the upper and lower molds via a lifting mechanism after injection molding and cooling, forcibly ejecting the core axially from the cup lid's threads. This direct ejection method has significant drawbacks: because the plastic part exerts a clamping force on the threaded structure of the core after cooling, forced axial separation causes severe friction and shearing between the core's threads and the cup lid's internal threads. This easily leads to scratches, abrasions, and other damage on the cup lid's threaded surface, severely affecting the product's appearance and sealing performance. Simultaneously, the significant demolding resistance can easily cause deformation of the cup lid body, and even localized tearing of the threads. These problems directly result in low production yield, increased production costs, and hindered improvements in production efficiency. Utility Model Content

[0004] 1. The technical problem to be solved by the utility model: This utility model provides a cup lid injection mold to solve the technical problems existing in the background art.

[0005] 2. Technical Solution: To achieve the above objectives, the technical solution provided by this utility model is as follows: a cup lid injection mold, including a base plate, a lower mold base fixedly installed on the top of the base plate, an upper mold base provided above the lower mold base, and a lifting drive mechanism connected to the upper mold base for driving it to reciprocate in the vertical direction; The lower mold base has a circular cavity at its top, and the upper mold base has a mold core fixedly installed at its bottom. The mold core is coaxially arranged with the circular cavity, and its radius is smaller than the radius of the circular cavity. The outer wall of the mold core has a threaded structure, and its top is coaxially connected to a drive shaft. The drive shaft is rotatably connected to the upper mold base.

[0006] Furthermore, the lifting drive mechanism includes four support columns arranged in a rectangular array. A top plate is fixedly installed on the top of the support columns. A cylinder is installed on the top plate. The piston rod of the cylinder passes vertically downward through the top plate and is fixedly connected to the top center of the upper mold base. Guide rods are also fixed at the four corners of the top of the upper mold base. Guide holes are correspondingly opened on the top plate for the guide rods to pass through, and the two form a sliding fit.

[0007] Furthermore, the top end of the drive shaft extends above the upper mold base and is fixedly fitted with a first bevel gear. The first bevel gear meshes with a second bevel gear. The second bevel gear is fixedly mounted on a horizontally arranged rotating rod. The rotating rod is rotatably supported on the top of the upper mold base through a bearing seat. A drive gear is also fixedly mounted on the rotating rod. The drive gear meshes with a vertical rack fixed on the top plate.

[0008] Furthermore, the lower mold base is provided with an ejector groove, and an ejector electric push rod is installed at the bottom of the ejector groove. The piston rod of the ejector electric push rod is vertically upward and fixedly connected to an ejector plate. Several push rods are fixed on the ejector plate and evenly distributed around the circumference. Each push rod passes through a sliding hole corresponding to the top of the ejector groove and can slide into the bottom of the circular cavity.

[0009] Furthermore, a flow channel distribution cavity is provided inside the upper mold base. The top of the flow channel distribution cavity is connected to an external injection molding machine through an injection hose, and multiple injection ports are evenly provided at the bottom along the circumference. The injection ports are located between the mold core and the circular cavity.

[0010] Furthermore, a main sealing ring is integrally formed around the circular cavity on the top of the lower mold base, and secondary sealing ribs are provided on both the inner and outer sides of the main sealing ring, corresponding to the annular groove at the bottom of the upper mold base.

[0011] 3. Beneficial effects: Compared with the prior art, the technical solution provided by this utility model has the following advantages: When the mold is closed, the lifting drive mechanism drives the upper mold base to move down and close with the lower mold base. The mold core extends into the circular cavity, and its outer wall thread and the inner wall of the cavity form a cup lid forming cavity. After the molten plastic is injected and cooled, the transmission shaft drives the mold core to rotate along the direction of the thread. At the same time, the lifting mechanism drives the upper mold base to move up, so that the mold core spirals up during rotation, realizing the non-destructive demolding of the thread structure and avoiding damage caused by direct ejection. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the lower mold base and upper mold base of this utility model; Figure 3 This is a schematic diagram of the top structure of the upper mold base of this utility model; Figure 4 This is a schematic diagram of the exploded structure of the main sealing ring and annular groove of this utility model.

[0013] Figure label: 1. Base plate; 2. Lower mold base; 201. Circular cavity; 202. Ejector groove; 203. Sliding hole; 204. Main sealing ring; 205. Secondary sealing rib; 3. Upper mold base; 301. Flow channel distribution cavity; 302. Injection port; 303. Annular groove; 4. Lifting drive mechanism; 401. Support column; 402. Top plate; 403. Cylinder; 404. Guide rod; 5. Mold core; 501. Threaded structure; 502. Drive shaft; 6. First bevel gear; 7. Second bevel gear; 8. Rotating rod; 9. Bearing seat; 10. Drive gear; 11. Vertical rack; 12. Electric push rod; 13. Ejector plate; 14. Ejector rod; 15. Injection hose. Detailed Implementation

[0014] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0015] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example

[0018] See attached document Figure 1-4 A cup lid injection mold includes a base plate 1, a lower mold base 2 fixedly installed on the top of the base plate 1, an upper mold base 3 provided above the lower mold base 2, and a lifting drive mechanism 4 connected to the upper mold base 3 for driving it to reciprocate in the vertical direction. The lower mold base 2 has a circular cavity 201 at the top, and the upper mold base 3 has a mold core 5 fixedly installed at the bottom. The mold core 5 is coaxially arranged with the circular cavity 201, and its radius is smaller than the radius of the circular cavity 201. The outer wall of the mold core 5 has a threaded structure 501, and its top is coaxially connected to a drive shaft 502. The drive shaft 502 is rotatably connected to the upper mold base 3.

[0019] In this embodiment, when the mold is closed, the lifting drive mechanism 4 drives the upper mold base 3 to move down, so that the upper mold base 3 and the lower mold base 2 are closed. At this time, the mold core 5 extends into the circular cavity 201. The threaded structure 501 on its outer wall and the inner wall of the circular cavity 201 form a cup lid forming cavity with threaded features. Molten plastic is injected into the cavity. After cooling and solidification, the transmission shaft 502 is driven to rotate in the direction of thread screwing out, which drives the mold core 5 to rotate synchronously. At the same time, the lifting drive mechanism 4 drives the upper mold base 3 to move up, so that the mold core 5 makes a spiral upward movement along the axial direction while rotating, thereby realizing the non-destructive demolding of the threaded structure 501 and avoiding damage to the threads of the cup lid by direct ejection.

[0020] The lifting drive mechanism 4 includes four support columns 401 arranged in a rectangular array. A top plate 402 is fixedly installed on the top of the support columns 401. A cylinder 403 is installed on the top plate 402. The piston rod of the cylinder 403 passes vertically downward through the top plate 402 and is fixedly connected to the top center of the upper mold base 3. Guide rods 404 are also fixed at the four corners of the top of the upper mold base 3. Guide holes for the guide rods 404 to pass through are correspondingly opened on the top plate 402, and the two form a sliding fit.

[0021] In this embodiment, when the mold is closed or opened, the cylinder 403 drives the upper mold base 3 to rise and fall. During this process, the guide rod 404 slides with the guide hole on the top plate 402 to ensure that the upper mold base 3 moves smoothly and without deflection.

[0022] The top end of the drive shaft 502 extends above the upper mold base 3 and is fixedly fitted with a first bevel gear 6. The first bevel gear 6 meshes with a second bevel gear 7. The second bevel gear 7 is fixedly mounted on a horizontally arranged rotating rod 8. The rotating rod 8 is rotatably supported on the top of the upper mold base 3 through a bearing seat 9. A drive gear 10 is also fixedly mounted on the rotating rod 8. The drive gear 10 meshes with a vertical rack 11 fixed on the top plate 402.

[0023] In this embodiment, when the lifting drive mechanism 4 drives the upper mold base 3 to rise and fall, the vertical rack 11 fixed to the top plate 402 forces the drive gear 10 meshing with it to rotate, thereby driving the rotating rod 8 and the second bevel gear 7 to rotate synchronously. The second bevel gear 7 then transmits power to the first bevel gear 6 meshing with it, and finally drives the transmission shaft 502 and the mold core 5 to rotate, realizing the spiral demolding motion.

[0024] The lower mold base 2 is provided with an ejector groove 202. An ejector electric push rod 12 is installed at the bottom of the ejector groove 202. The piston rod of the ejector electric push rod 12 is vertically upward and fixedly connected to an ejector plate 13. Several ejector rods 14 are fixed on the ejector plate 13 and are evenly distributed along the circumference. Each ejector rod 14 passes through a sliding hole 203 corresponding to the top of the ejector groove 202 and can slide into the bottom of the circular cavity 201.

[0025] In this embodiment, during demolding, the piston rod of the ejector electric push rod 12 extends upward, pushing the ejector plate 13 and the ejector rod 14 to move upward synchronously along the sliding hole 203, thereby smoothly ejecting the cooled and formed cup lid product from the circular cavity 201 and completing the demolding.

[0026] The upper mold base 3 has a flow channel distribution cavity 301 inside. The top of the flow channel distribution cavity 301 is connected to an external injection molding machine through an injection hose 15, and the bottom is evenly provided with multiple injection ports 302 along the circumference. The injection ports 302 are located between the mold core 5 and the circular cavity 201.

[0027] In this embodiment, during injection molding, an external injection molding machine injects molten plastic into the flow channel distribution cavity 301 through the injection hose 15. Subsequently, the molten material is synchronously and evenly filled into the cup lid molding cavity through the circumferentially evenly distributed injection ports 302, thereby ensuring the molding quality of the cup lid product.

[0028] The top of the lower mold base 2 is integrally formed with a main sealing ring 204 around the circular cavity 201. The inner and outer sides of the main sealing ring 204 are also provided with secondary sealing ribs 205, which correspond to the annular groove 303 at the bottom of the upper mold base 3.

[0029] In this embodiment, when the mold is closed, the main sealing ring 204 and the secondary sealing rib 205 are embedded together in the annular groove 303 at the bottom of the upper mold base 3 to form a seal, effectively preventing molten plastic from overflowing from the parting surface during the injection molding process after the mold is closed.

[0030] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0031] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art.

Claims

1. A cup lid injection mold, characterized in that: Includes a base plate (1), a lower mold base (2) is fixedly installed on the top of the base plate (1), an upper mold base (3) is provided above the lower mold base (2), and the upper mold base (3) is connected to a lifting drive mechanism (4) for driving it to reciprocate in the vertical direction. The lower mold base (2) has a circular cavity (201) at the top, and the upper mold base (3) has a mold core (5) fixedly installed at the bottom. The mold core (5) is coaxially arranged with the circular cavity (201), and its radius is smaller than the radius of the circular cavity (201). The outer wall of the mold core (5) has a threaded structure (501), and its top is coaxially connected to a drive shaft (502). The drive shaft (502) is rotatably connected to the upper mold base (3).

2. The cup lid injection mold according to claim 1, characterized in that: The lifting drive mechanism (4) includes four support columns (401) arranged in a rectangular array. A top plate (402) is fixedly installed on the top of the support columns (401). A cylinder (403) is installed on the top plate (402). The piston rod of the cylinder (403) passes vertically downward through the top plate (402) and is fixedly connected to the top center of the upper mold base (3). Guide rods (404) are also fixed at the four corners of the top of the upper mold base (3). Guide holes for the guide rods (404) to pass through are correspondingly opened on the top plate (402). The two form a sliding fit.

3. The cup lid injection mold according to claim 2, characterized in that: The top end of the drive shaft (502) extends above the upper mold base (3) and is fixedly fitted with a first bevel gear (6). The first bevel gear (6) meshes with a second bevel gear (7). The second bevel gear (7) is fixedly mounted on a horizontally arranged rotating rod (8). The rotating rod (8) is rotatably supported on the top of the upper mold base (3) through a bearing seat (9). A drive gear (10) is also fixedly mounted on the rotating rod (8). The drive gear (10) meshes with a vertical rack (11) fixed on the top plate (402).

4. The cup lid injection mold according to claim 1, characterized in that: The lower mold base (2) is provided with an ejector groove (202). An ejector electric push rod (12) is installed at the bottom of the ejector groove (202). The piston rod of the ejector electric push rod (12) is vertically upward and fixedly connected to an ejector plate (13). Several ejector rods (14) are fixed on the ejector plate (13) and are evenly distributed along the circumference. Each ejector rod (14) passes through a sliding hole (203) corresponding to the top of the ejector groove (202) and can slide into the bottom of the circular cavity (201).

5. The cup lid injection mold according to claim 1, characterized in that: The upper mold base (3) has a flow channel distribution cavity (301) inside. The top of the flow channel distribution cavity (301) is connected to an external injection molding machine through an injection hose (15), and the bottom is evenly provided with multiple injection ports (302) along the circumference. The injection ports (302) are located between the mold core (5) and the circular cavity (201).

6. The cup lid injection mold according to claim 1, characterized in that: The lower mold base (2) has a main sealing ring (204) integrally formed around the circular cavity (201) on the top. The inner and outer sides of the main sealing ring (204) are also provided with secondary sealing ribs (205), which correspond to the annular groove (303) at the bottom of the upper mold base (3).

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