A bottle cap injection mold ejection mechanism

Abstract

The utility model discloses a kind of bottle cap injection mould ejection mechanism, it is related to bottle cap mould technical field, including base, mould fixed plate and gear mounting plate, the middle part of base outer wall is connected with mould fixed plate, mould fixed plate outer wall middle part is connected with gear mounting plate by gasket, the inside of mould fixed plate is equipped with forming mould, the both sides of the inside of forming mould are equipped with bottle cap forming cavity, bottle cap forming cavity inside is connected with bottle cap body, gear mounting plate outer wall one side is equipped with servo motor, servo motor output end is fixedly connected with driving gear, the outer wall of driving gear is engaged with connecting bridge gear, the outer wall of connecting bridge gear is engaged with transmission gear, the outer wall of transmission gear is engaged with driven gear on both sides, driven gear inner wall is connected with threaded core, the inside of threaded core is connected with locating shaft, locating shaft bottom end is fixedly connected with locating seat.

Description

Technical Field

[0001] This utility model relates to the field of bottle cap mold technology, specifically to an ejection mechanism for a bottle cap injection mold. Background Technology

[0002] The ejection mechanism of a bottle cap injection mold is a mechanical device used to smoothly eject the molded bottle cap from the mold cavity after the injection, cooling, and thread demolding processes are completed, thus achieving automatic product unloading. Its main function is to overcome the adhesion between the plastic part and the mold, and to complete the action of the plastic part detaching from the mold without damaging the appearance and structure of the product, ensuring continuous injection molding production.

[0003] Existing bottle cap injection molds generally lack effective anti-rotation and limiting structures during the rotational demolding process. The plastic parts are very easy to rotate synchronously with the threaded core. At the same time, traditional molds mostly use direct rigid ejection demolding methods, and mechanical ejection structures will generate rigid impacts on thin-walled bottle caps, resulting in concentrated and uneven force, which aggravates the deformation and breakage of plastic parts, affecting product production stability and yield. Utility Model Content

[0004] The purpose of this invention is to provide an ejection mechanism for bottle cap injection molds to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bottle cap injection mold ejection mechanism, comprising a base, a mold fixing plate, and a gear mounting plate. The mold fixing plate is connected to the middle of the outer wall of the base. The gear mounting plate is connected to the middle of the outer wall of the mold fixing plate via a pad. A core fixing plate is connected to the middle of the gear mounting plate. A guide sleeve fixing plate is connected to the middle of the core fixing plate. A forming mold is installed inside the mold fixing plate. Bottle cap forming cavities are opened on both sides inside the forming mold. A bottle cap body is connected inside each bottle cap forming cavity. The gear mounting plate... A servo motor is installed on one side of the outer wall. A drive gear is fixedly connected to the output end of the servo motor. A bridge gear is meshed with the outer wall of the drive gear. A transmission gear is meshed with the outer wall of the bridge gear. Driven gears are meshed with both sides of the outer wall of the transmission gear. A threaded core is connected to the inner wall of the driven gear. A positioning shaft is connected inside the threaded core. A positioning seat is fixedly connected to the bottom end of the positioning shaft. A threaded groove is opened on the outer side of the inner wall of the bottle cap body. Positioning blocks with equal included angles are fixedly connected to the middle of the inner wall. A limiting groove corresponding to the positioning block is opened on the outer wall of the positioning seat.

[0006] Preferably, the threaded core can move vertically to drive the bottle cap body out of the bottle cap forming cavity, the limiting groove cooperates with the positioning block to restrict the rotation of the bottle cap body, and the driven gear can drive the threaded core to rotate, so that the threaded core is disengaged from the thread groove.

[0007] The threaded core is still inside the threaded groove. As the mold opens, the threaded core drives the bottle cap body to detach from the bottle cap forming cavity. Then the servo motor starts and drives the threaded core to rotate and retract through gear transmission. Relying on the anti-rotation cooperation between the positioning block and the limiting groove, the threaded core smoothly rotates away from the threaded groove, eliminating the thread clamping force.

[0008] Preferably, the bottle cap forming cavity is used to form the outer contour of the bottle cap body, the threaded core is used to form the threaded groove on the inner wall of the bottle cap body, and the limiting groove is used to form the positioning block on the inner wall of the bottle cap body.

[0009] The bottle cap forming cavity forms the outer contour of the bottle cap body, the threaded core forms the threaded groove, and the positioning seat limiting groove forms the positioning block. Molten plastic is injected into the cavity, cooled and shaped, and the bottle cap body is held tightly on the outside of the threaded core.

[0010] Preferably, the positioning shaft has an air cavity inside, and the positioning seat has an air jet hole inside. The air cavity and the air jet hole form an air jet channel for blowing off the bottle cap body on the outer wall of the positioning seat.

[0011] Once the threaded core has completely disengaged from the threaded groove, compressed gas is introduced into the air chamber. The airflow is ejected from the jet hole, generating axial thrust that blows the bottle cap body stuck on the positioning seat off the mold, completing the final ejection and unloading.

[0012] As can be seen from the above, the ejection mechanism of the bottle cap injection mold provided by this utility model has the following beneficial effects.

[0013] By adopting a transmission structure with servo motors and multi-stage split gear sets, two sets of threaded cores can be driven synchronously to complete the unscrewing action, and the production cycle of the two cavities is consistent. The gears are centrally arranged in the gear mounting plate area to avoid dust accumulation and collisions on the exposed gears, reduce gear wear and jamming problems, and maintain the coaxiality of the assembly of each component and the transmission accuracy during long-term operation.

[0014] By engaging and limiting the positioning slot of the positioning seat with the positioning block of the bottle cap body, the bottle cap is restricted from rotating. This eliminates the traditional method of forcibly pushing the cap out of the mold, avoiding problems such as whitening, cracking, deformation, and thread extrusion damage caused by hard pushing when the threads are not detached. This ensures the integrity of the thread structure and the quality of the appearance molding.

[0015] The threaded core rotates and retracts by gears to release the thread clamping force, and then air is ejected through the air chamber and air jet hole to complete the final unloading. The step demolding is even and gentle, preventing uneven force on the ejector pin. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the guide sleeve fixing plate and servo motor of this utility model; Figure 3This is a three-dimensional structural diagram of the mold fixing plate and core fixing plate of this utility model; Figure 4 This is a side view of the drive gear, bridge gear, transmission gear, and driven gear of this utility model. Figure 5 This is a three-dimensional structural diagram of the transmission gear and driven gear of this utility model; Figure 6 This is a three-dimensional structural diagram of the molding die and bottle cap body of this utility model; Figure 7 This is a three-dimensional structural diagram of the molding die, the bottle cap forming cavity, and the bottle cap body of this utility model; Figure 8 This is a three-dimensional structural diagram of the driven gear and threaded core of this utility model; Figure 9 This is a three-dimensional structural diagram of the bottle cap body, threaded groove, and positioning block of this utility model; Figure 10 This is a three-dimensional structural diagram of the threaded core, positioning seat, and limiting groove of this utility model; Figure 11 This is a three-dimensional structural diagram of the positioning shaft, positioning seat, and limiting groove of this utility model; Figure 12 This is a three-dimensional structural diagram of the positioning shaft, positioning seat, and bottle cap body of this utility model.

[0017] In the diagram: 1. Base; 2. Mold fixing plate; 3. Gear mounting plate; 4. Core fixing plate; 5. Guide sleeve fixing plate; 6. Molding mold; 7. Bottle cap forming cavity; 8. Bottle cap body; 9. Servo motor; 10. Drive gear; 11. Bridge gear; 12. Transmission gear; 13. Driven gear; 14. Threaded core; 15. Positioning shaft; 16. Positioning seat; 17. Threaded groove; 18. Positioning block; 19. Limiting groove; 20. Air cavity; 21. Air jet hole. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-12This utility model provides a technical solution: a bottle cap injection mold ejection mechanism, including a base 1, a mold fixing plate 2 and a gear mounting plate 3. The mold fixing plate 2 is fixed on the outside of the base 1. The mold fixing plate 2 is connected to the gear mounting plate 3 through a pad. A core fixing plate 4 is set in the middle of the gear mounting plate 3. A guide sleeve fixing plate 5 is installed in the middle of the core fixing plate 4. A forming mold 6 is embedded in the mold fixing plate 2. The forming mold 6 has two sets of bottle cap forming cavities 7 symmetrically opened, which can realize dual-cavity synchronous injection molding and produce two bottle cap bodies 8 at a time.

[0020] A servo motor 9 is mounted on one side of the gear mounting plate 3. The output end of the servo motor 9 is rigidly connected to the drive gear 10. The drive gear 10 meshes with the bridge gear 11, which in turn meshes with the transmission gear 12. The transmission gear 12 meshes with the driven gears 13 on both sides, forming a single-stage split-type gear transmission chain. During operation, the servo motor 9 outputs torque, which drives the two driven gears 13 to rotate synchronously through the drive gear 10, bridge gear 11, and transmission gear 12. The driven gears 13 drive the threaded core 14, which is fixed to them, to rotate synchronously. The outer tooth profile of the threaded core 14 matches the threaded groove 17 on the inner wall of the bottle cap body 8. The threaded core 14 can move vertically along the axial direction. During rotation, it retracts axially by relying on the threaded engagement, gradually unscrewing from the threaded groove 17 to complete the demolding of the internal thread.

[0021] The positioning shaft 15 passes through the inside of the threaded core 14. The bottom end of the positioning shaft 15 is fixed with a positioning seat 16. The outer wall of the positioning seat 16 is provided with a limiting groove 19 corresponding to the positioning block 18 on the inner wall of the bottle cap body 8. When the threaded core 14 is unscrewed, the positioning block 18 is engaged in the limiting groove 19, which restricts the bottle cap body 8 from rotating synchronously with the threaded core 14, ensuring that the threaded core 14 can be unscrewed smoothly, avoiding damage to the threads, and ensuring the molding accuracy of the thread demolding.

[0022] A through air chamber 20 is opened inside the positioning shaft 15, and an air jet hole 21 connected to the air chamber 20 is opened in the positioning seat 16. The two form a high-pressure air jet channel. When the threaded core 14 is completely disengaged from the threaded groove 17, compressed gas is introduced into the air chamber 20. The airflow is ejected from the air jet hole 21, generating axial thrust, which blows the bottle cap body 8 stuck on the positioning seat 16 off the mold, completing the final ejection and unloading.

[0023] During operation, all modules close, the bottle cap forming cavity 7 forms the outer contour of the bottle cap body 8, the threaded core 14 forms the threaded groove 17, the positioning seat 16 and the limiting groove 19 form the positioning block 18, the molten plastic is injected into the cavity to cool and solidify, and the bottle cap body 8 is held tightly on the outside of the threaded core 14.

[0024] After the mold is opened, the threaded core 14 is still located inside the threaded groove 17. As the mold is opened, the threaded core 14 drives the bottle cap body 8 to detach from the bottle cap forming cavity 7. Then the servo motor 9 starts and drives the threaded core 14 to rotate and retract through gear transmission. Relying on the anti-rotation cooperation between the positioning block 18 and the limiting groove 19, the threaded core 14 smoothly rotates away from the threaded groove 17, eliminating the thread clamping force. Then compressed air is introduced into the air cavity 20, and the airflow is ejected through the jet hole 21, blowing the bottle cap body 8 off the positioning seat 16.

[0025] This solution adopts a transmission structure of servo motor 9 and multi-stage split gear set, which can synchronously drive two sets of threaded cores 14 to complete the unscrewing action, and the production cycle of the two cavities is consistent; the gears are centrally arranged in the area of ​​gear mounting plate 3 to avoid the gears being exposed, accumulating dust and bumping, reducing the problem of gear wear and jamming, and maintaining the coaxiality of the assembly of each component and the transmission accuracy during long-term operation.

[0026] By engaging and limiting the positioning of the positioning seat 16 with the positioning block 18 of the bottle cap body 8, the bottle cap rotation phenomenon is restricted, abandoning the traditional forced demolding method, avoiding problems such as whitening, cracking, deformation, and thread extrusion damage caused by hard ejection when the thread is not detached, thus ensuring the integrity of the thread structure and the quality of the appearance molding.

[0027] The threaded core 14 is rotated and retracted by the gear to release the thread clamping force. Then, the final material is discharged by air jetting through the air chamber 20 and air jet hole 21. The demolding is carried out in a step-by-step manner with uniform and gentle force, which prevents uneven force on the ejector rod. The air jetting method does not have a hard mechanical impact on the bottle cap, which is suitable for the demolding requirements of thin bottle cap products.

[0028] In practice, the base 1, mold fixing plate 2, gear mounting plate 3, core fixing plate 4, guide sleeve fixing plate 5, and forming mold 6 constitute the main frame of the mold. All parts of the mold are completely closed. The forming mold 6, threaded core 14, and positioning seat 16 cooperate with each other to form a complete mold cavity. The outer contour of the bottle cap body 8 is formed by the bottle cap forming cavity 7, the threaded core 14 forms the inner wall thread groove 17, and the limiting groove 19 cooperates to form the inner wall positioning block 18. Molten plastic is injected into the mold cavity and cooled and solidified by the cooling system to form the bottle cap body 8. After cooling and shrinking, the bottle cap body 8 is tightly held on the outside of the threaded core 14.

[0029] After cooling and shaping, the mold performs the mold opening action. The threaded core 14 is still engaged in the threaded groove 17. Relying on the thread clamping force, the bottle cap body 8 is driven to detach from the bottle cap forming cavity 7 and move to the designated demolding station. The servo motor 9 starts, and the power is transmitted to the drive gear 10, the bridge gear 11, the transmission gear 12 and the driven gear 13 in sequence, which synchronously drive the two sets of threaded cores 14 to rotate and move backward along the axial direction. The positioning block 18 on the inner wall of the bottle cap body 8 is engaged in the limiting groove 19 of the positioning seat 16 to restrict the rotation of the bottle cap body 8. The threaded core 14 is smoothly unscrewed from the threaded groove 17, releasing the thread clamping force.

[0030] After the threaded core 14 is completely detached from the bottle cap body 8, compressed air is introduced into the air chamber 20 inside the positioning shaft 15. The airflow is ejected through the jet hole 21, and the bottle cap body 8, which is sleeved on the positioning seat 16, is blown off by the air pressure thrust, thus completing the unloading of the finished product. The servo motor 9 rotates in the opposite direction, and drives the threaded core 14 to rotate in the opposite direction and move forward axially through the gear set, returning to the initial molding position. Then the mold is re-closed and locked, and the above steps are repeated to realize continuous automated injection molding production.

[0031] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A bottle cap injection mold ejection mechanism, comprising a base (1), a mold fixing plate (2), and a gear mounting plate (3), wherein the mold fixing plate (2) is connected to the middle of the outer wall of the base (1), the gear mounting plate (3) is connected to the middle of the outer wall of the mold fixing plate (2) via a pad, a core fixing plate (4) is connected to the middle of the gear mounting plate (3), a guide sleeve fixing plate (5) is connected to the middle of the core fixing plate (4), and a molding mold (6) is installed inside the mold fixing plate (2), characterized in that: The molding die (6) has bottle cap forming cavities (7) on both sides inside. The bottle cap forming cavity (7) is connected to the bottle cap body (8). A servo motor (9) is installed on one side of the outer wall of the gear mounting plate (3). A drive gear (10) is fixedly connected to the output end of the servo motor (9). A bridge gear (11) is meshed with the outer wall of the drive gear (10). A transmission gear (12) is meshed with the outer wall of the bridge gear (11). A driven gear (13) is meshed with both sides of the outer wall of the transmission gear (12). A threaded core (14) is connected to the inner wall of the driven gear (13). A positioning shaft (15) is connected inside the threaded core (14). A positioning seat (16) is fixedly connected to the bottom end of the positioning shaft (15). A threaded groove (17) is opened on the outer side of the inner wall of the bottle cap body (8). A positioning block (18) with equal included angles is fixedly connected to the middle of the inner wall. A limiting groove (19) corresponding to the positioning block (18) is opened on the outer wall of the positioning seat (16).

2. The ejection mechanism of the bottle cap injection mold according to claim 1, characterized in that: The threaded core (14) can move vertically to drive the bottle cap body (8) out of the bottle cap forming cavity (7). The limiting groove (19) cooperates with the positioning block (18) to restrict the rotation of the bottle cap body (8). The driven gear (13) can drive the threaded core (14) to rotate, so that the threaded core (14) is out of the thread groove (17).

3. The ejection mechanism of the bottle cap injection mold according to claim 2, characterized in that: The bottle cap forming cavity (7) is used to form the outer contour of the bottle cap body (8), the threaded core (14) is used to form the inner wall thread groove (17) of the bottle cap body (8), and the limiting groove (19) is used to form the inner wall positioning block (18) of the bottle cap body (8).

4. The ejection mechanism of the bottle cap injection mold according to claim 3, characterized in that: The positioning shaft (15) has an air chamber (20) inside, and the positioning seat (16) has an air jet hole (21) inside. The air chamber (20) and the air jet hole (21) form an air jet channel to blow off the bottle cap body (8) on the outer wall of the positioning seat (16).

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