Injection mold with positioning cavity for injection molding machine

Abstract

The invention belongs to the technical field of glass processing, and particularly relates to an injection mold with a positioning cavity for an injection molding machine, the injection mold comprises a movable mold, a fixed mold, a servo motor and a demolding mechanism, the movable mold and the fixed mold are oppositely arranged up and down and are matched with each other, a mold core cavity is formed in the bottom of the movable mold, and a floating mold core is arranged in the mold core cavity; a plurality of springs are connected between the top of the floating mold core and the mold core cavity, a positioning cavity is formed in the top of the fixed mold and matched with the bottom of the floating mold core, the servo motor is arranged on one side of the fixed mold and drives the movable mold to move up and down through the transmission mechanism, and the demolding mechanism is arranged in the fixed mold. The demolding device is used for demolding the glass in the positioning cavity. By arranging the floating mold core, glass can be prevented from being broken, the mold is protected, and the product quality is improved; plastic colloid flashes can be reduced, the workload of workers is reduced, and the cost is saved; by arranging the demolding mechanism, material taking is convenient, and the working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of glass processing, and in particular relates to an injection mold with a positioning cavity for an injection molding machine. Background Art

[0002] Glass PV treatment usually refers to special treatment on the glass surface to improve its optical properties and durability. After PV treatment, the glass needs to be injection molded and edged. Generally, the glass is placed in a cavity composed of a movable mold and a fixed mold, and then the mold is closed and injection molded by an injection molding machine. After cooling, the mold is opened and the workpiece is taken out, and the edge-wrapping process is completed.

[0003] However, due to the variation in glass thickness, the deviation is generally around ±0.2mm. The space for accommodating glass in the existing mold is constant. If the glass is too thick, the glass will be crushed after the mold is closed due to the small cavity space, which will scratch the mold and affect the PV effect of subsequent glass processing. If the glass is too thin, a large gap will be generated. Therefore, during the injection molding process, the plastic colloid will overflow from the gap and produce flash, which affects the appearance quality of the product and requires an additional manual repair process, increasing costs. In addition, the mold lacks an automatic demolding function, which makes it inconvenient to remove materials.

[0004] Therefore, improvements are urgently needed. Summary of the invention

[0005] In view of the above-mentioned defects in the prior art, the present invention provides an injection mold with a positioning cavity for an injection molding machine, comprising a movable mold, a fixed mold, a servo motor and a demolding mechanism. The movable mold and the fixed mold are arranged relatively to each other up and down and match each other. A core cavity is arranged at the bottom of the movable mold, a floating core is arranged in the core cavity, and the bottom of the floating core protrudes out of the core cavity. A plurality of springs are connected between the top of the floating core and the core cavity. A positioning cavity is arranged at the top of the fixed mold, and the positioning cavity matches the bottom of the floating core. The servo motor is arranged on one side of the fixed mold, and the servo motor drives the movable mold to move up and down through a transmission mechanism. The demolding mechanism is arranged inside the fixed mold for demolding the glass in the positioning cavity.

[0006] Optionally, the transmission mechanism includes a top plate, a bottom plate, a lifting plate, a guide rod and a threaded rod, the top plate and the bottom plate are arranged up and down, and the fixed mold is fixed on the bottom plate, the lifting plate is arranged between the top plate and the bottom plate, and the movable mold is fixed on the bottom surface of the lifting plate, the guide rod is fixed between the top plate and the bottom plate, the threaded rod is rotatably connected between the top plate and the bottom plate, and the threaded rod is parallel to the guide rod, the guide rod and the threaded rod respectively pass through the left and right ends of the lifting plate, and the lifting plate is slidably connected to the threaded rod through the nut pair of the threaded rod, and the output shaft of the servo motor is transmission-connected to the threaded rod through a bevel gear transmission pair.

[0007] Optionally, the bevel gear transmission pair includes a meshing horizontal bevel gear and a vertical bevel gear, the horizontal bevel gear is fixed to the outside of the threaded rod, and the vertical bevel gear is installed on the output shaft of the servo motor.

[0008] Optionally, a receiving groove is provided at the bottom of the positioning cavity, a transmission cavity is provided inside the fixed mold, and the transmission cavity is located below the receiving groove.

[0009] Optionally, the demolding mechanism includes a push plate, a rack, a gear and a rotating rod. The push plate is arranged in a receiving groove below the positioning cavity, and the rack, the gear and the rotating rod are all arranged in the transmission cavity of the fixed mold. The top end of the rack is fixedly connected to the bottom surface of the push plate, and the gear is meshed with the rack. One end of the rotating rod passes through the gear and is rotatably connected to the inner wall of the transmission cavity, and the other end passes through the fixed mold and is connected to the output shaft of the servo motor through a sprocket chain transmission structure, and the rotating rod and the gear are fixedly connected.

[0010] Optionally, the sprocket chain transmission structure includes a driving sprocket mounted on the output shaft of the servo motor, a driven sprocket fixed on the rotating rod, and a chain wound around the driving sprocket and the driven sprocket.

[0011] Optionally, a transmission ratio between the driving sprocket and the driven sprocket is less than 1.

[0012] Specifically, since the distance the push plate moves up and down is smaller than the distance the lifting plate moves up and down, in order for the push plate to just fall into the accommodating groove when the servo motor drives the movable mold and the fixed mold to fit up and down, a smaller transmission ratio can be used.

[0013] Optionally, a vertical limiting groove is provided on the fixed mold, and a limiting rod is fixedly connected to the bottom of the push plate, and the limiting rod is inserted into the limiting groove.

[0014] Specifically, the limiting groove plays a guiding and limiting role on the limiting rod, thereby guiding the up and down movement of the push plate.

[0015] Optionally, the number of the springs is eight, and the eight springs are arranged in groups of four by four and symmetrically arranged left and right.

[0016] Specifically, the connecting lines of the eight springs can form an octagon, so that the floating mold core can be balanced in force.

[0017] The present invention also includes other components that enable an injection molding machine with an injection mold having a positioning cavity to be used normally, which are all conventional technical means in the art. In addition, the devices or components not limited in the present invention all adopt conventional technical means in the art.

[0018] The working principle of the present invention is to place the glass plate on the push plate in the positioning cavity, control the output shaft of the servo motor to rotate forward, drive the threaded rod to rotate, and move the lifting plate downward. At the same time, the servo motor drives the rotating rod to rotate, driving the gear to rotate, and then the meshing rack moves downward, thereby driving the push plate and the glass plate thereon to move downward together. After the push plate falls into the accommodating groove, the movable mold and the fixed mold just fit together, and the floating mold core presses the glass plate from above. Since a spring is connected to the top of the floating mold core, it can adapt well to fix the glass plate whether it is too thick or too thin, and then perform injection molding. After the injection molding is completed, the output shaft of the servo motor is controlled to reverse, drive the lifting plate to move up, and drive the push plate to move up at the same time, so as to push the hemmed glass plate out of the positioning cavity to complete demolding.

[0019] The beneficial effects of the present invention are:

[0020] (1) By setting a floating mold core, it is not only possible to avoid glass breakage, protect the mold, and improve product quality; it is also possible to reduce plastic colloid flash, reduce workers' workload, and save costs.

[0021] (2) By setting up a demoulding mechanism, it is convenient to take out materials and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the demoulding mechanism of the present invention when performing demoulding.

[0025] Figure 3 It is a schematic diagram of the top structure of the floating mold core of the present invention.

[0026] In the figure: 1. movable mold, 2. fixed mold, 3. servo motor, 4. floating mold core, 5. spring, 6. positioning cavity, 7. top plate, 8. bottom plate, 9. lifting plate, 10. guide rod, 11. threaded rod, 12. bevel gear transmission pair, 13. transmission cavity, 14. push plate, 15. rack, 16. gear, 17. rotating rod, 18. sprocket chain transmission structure, 19. limit groove, 20. limit rod, 21. glass plate. DETAILED DESCRIPTION

[0027] The present invention is described clearly below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description herein is only used to explain the present invention, but is not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0028] Example

[0029] like Figure 1-3 As shown, an embodiment of the present invention provides an injection mold with a positioning cavity for an injection molding machine, comprising a movable mold 1, a fixed mold 2, a servo motor 3 and a demolding mechanism. The movable mold 1 and the fixed mold 2 are arranged opposite to each other up and down and match each other. A core cavity is arranged at the bottom of the movable mold 1, and a floating core 4 is arranged in the core cavity, and the bottom of the floating core 4 protrudes from the core cavity. Eight springs 5 ​​are connected between the top of the floating core 4 and the core cavity. The eight springs 5 ​​are arranged in groups of four and four and are symmetrically arranged on the left and right. The connecting line of the positions of the eight springs 5 ​​can form an octagon, so that the floating core 4 can be balanced by force; a positioning cavity 6 is arranged at the top of the fixed mold 2, and the positioning cavity 6 matches the bottom of the floating core 4. The servo motor 3 is arranged on one side of the fixed mold 2, and the servo motor 3 drives the movable mold 1 to move up and down through a transmission mechanism.

[0030] The transmission mechanism includes a top plate 7, a bottom plate 8, a lifting plate 9, a guide rod 10 and a threaded rod 11. The top plate 7 and the bottom plate 8 are arranged up and down, and the fixed mold 2 is fixed on the bottom plate 8. The lifting plate 9 is arranged between the top plate 7 and the bottom plate 8, and the movable mold 1 is fixed on the bottom surface of the lifting plate 9. The guide rod 10 is fixed between the top plate 7 and the bottom plate 8. The threaded rod 11 is rotatably connected between the top plate 7 and the bottom plate 8, and the threaded rod 11 is parallel to the guide rod 10. The guide rod 10 and the threaded rod 11 respectively pass through the left and right ends of the lifting plate 9, and the lifting plate 9 is slidably connected to the threaded rod 11 through the nut pair of the threaded rod 11. The output shaft of the servo motor 3 is transmission-connected to the threaded rod 11 through the bevel gear 16 transmission pair 12.

[0031] The bevel gear 16 transmission pair 12 includes a meshing horizontal bevel gear 16 and a vertical bevel gear 16 . The horizontal bevel gear 16 is fixed to the outside of the threaded rod 11 , and the vertical bevel gear 16 is installed on the output shaft of the servo motor 3 .

[0032] In addition, a receiving groove is provided at the bottom of the positioning cavity 6 , and a transmission cavity 13 is provided inside the fixed mold 2 , and the transmission cavity 13 is located below the receiving groove.

[0033] The demoulding mechanism is arranged inside the fixed mold 2 and is used for demoulding the glass in the positioning cavity 6 .

[0034] The demoulding mechanism includes a push plate 14, a rack 15, a gear 16 and a rotating rod 17. The push plate 14 is arranged in a receiving groove below the positioning cavity 6. The rack 15, the gear 16 and the rotating rod 17 are all arranged in the transmission cavity 13 of the fixed mold 2. The top of the rack 15 is fixedly connected to the bottom surface of the push plate 14, and the gear 16 is meshed with the rack 15. One end of the rotating rod 17 passes through the gear 16 and is rotatably connected to the inner wall of the transmission cavity 13, and the other end passes through the fixed mold 2 and is connected to the output shaft of the servo motor 3 through the sprocket chain transmission structure 18, and the rotating rod 17 and the gear 16 are fixedly connected.

[0035] The sprocket chain transmission structure 18 includes a driving sprocket mounted on the output shaft of the servo motor 3, a driven sprocket fixed on the rotating rod 17, and a chain wound around the driving sprocket and the driven sprocket.

[0036] The transmission ratio of the driving sprocket and the driven sprocket is less than 1. Since the distance that the push plate 14 moves up and down is smaller than the distance that the lifting plate 9 moves up and down, in order for the push plate 14 to just fall into the accommodating groove when the servo motor 3 drives the movable mold 1 and the fixed mold 2 to fit up and down, a smaller transmission ratio can be used.

[0037] In addition, a vertical limit groove 19 is opened on the fixed mold 2, and the bottom of the push plate 14 is fixedly connected to a limit rod 20, and the limit rod 20 is inserted into the limit groove 19. The limit groove 19 plays a guiding and limiting role for the limit rod 20, thereby guiding the up and down movement of the push plate 14.

[0038] The working principle of the present invention is to place the glass plate 21 on the push plate 14 in the positioning cavity 6, control the output shaft of the servo motor 3 to rotate forward, drive the threaded rod 11 to rotate, and move the lifting plate 9 downward. At the same time, the servo motor 3 drives the rotating rod 17 to rotate, driving the gear 16 to rotate, and then the meshing rack 15 moves downward, thereby driving the push plate 14 and the glass plate 21 thereon to move downward together. After the push plate 14 falls into the accommodating groove, the movable mold 1 and the fixed mold 2 also fit together, and the floating mold core 4 presses the glass plate 21 from above. Since the top of the floating mold core 4 is connected to a spring 5, no matter whether the glass plate 21 is too thick or too thin, it can adapt well to fix the glass plate 21, and then perform injection molding. After the injection molding is completed, the output shaft of the servo motor 3 is controlled to reverse, drive the lifting plate 9 to move upward, and drive the push plate 14 to move upward, so that the hemmed glass plate 21 is pushed out of the positioning cavity 6 to complete demoulding.

[0039] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the protection scope of the present invention.

Claims

1. An injection mold with a positioning cavity for an injection molding machine, comprising a movable mold, a fixed mold, a servo motor and a demoulding mechanism, characterized in that: The movable mold and the fixed mold are arranged opposite to each other up and down and match each other. A core cavity is arranged at the bottom of the movable mold, a floating core is arranged in the core cavity, and the bottom of the floating core protrudes out of the core cavity. A plurality of springs are connected between the top of the floating core and the core cavity. A positioning cavity is arranged at the top of the fixed mold, and the positioning cavity matches the bottom of the floating core. A servo motor is arranged on one side of the fixed mold, and the servo motor drives the movable mold to move up and down through a transmission mechanism. A demolding mechanism is arranged inside the fixed mold for demolding the glass in the positioning cavity.

2. The injection mold with a positioning cavity for an injection molding machine according to claim 1, characterized in that: The transmission mechanism includes a top plate, a bottom plate, a lifting plate, a guide rod and a threaded rod. The top plate and the bottom plate are arranged up and down, and the fixed mold is fixed on the bottom plate. The lifting plate is arranged between the top plate and the bottom plate, and the movable mold is fixed on the bottom surface of the lifting plate. The guide rod is fixed between the top plate and the bottom plate. The threaded rod is rotatably connected between the top plate and the bottom plate, and the threaded rod is parallel to the guide rod. The guide rod and the threaded rod respectively pass through the left and right ends of the lifting plate, and the lifting plate is slidably connected to the threaded rod through the nut pair of the threaded rod, and the output shaft of the servo motor is transmission-connected to the threaded rod through a bevel gear transmission pair.

3. The injection mold with a positioning cavity for an injection molding machine according to claim 2, characterized in that: The bevel gear transmission pair comprises a meshing horizontal bevel gear and a vertical bevel gear. The horizontal bevel gear is fixed on the outside of the threaded rod, and the vertical bevel gear is installed on the output shaft of the servo motor.

4. The injection mold with a positioning cavity for an injection molding machine according to claim 3, characterized in that: The bottom of the positioning cavity is provided with a receiving groove, the interior of the fixed mold is provided with a transmission cavity, and the transmission cavity is located below the receiving groove.

5. The injection mold with a positioning cavity for an injection molding machine according to claim 4, characterized in that: The demoulding mechanism includes a push plate, a rack, a gear and a rotating rod. The push plate is arranged in the accommodating groove below the positioning cavity. The rack, the gear and the rotating rod are all arranged in the transmission cavity of the fixed mold. The top of the rack is fixedly connected to the bottom surface of the push plate, and the gear is meshed with the rack. One end of the rotating rod passes through the gear and is rotatably connected to the inner wall of the transmission cavity, and the other end passes through the fixed mold and is connected to the output shaft of the servo motor through a sprocket chain transmission structure.

6. The injection mold with a positioning cavity for an injection molding machine according to claim 5, characterized in that: The sprocket chain transmission structure comprises a driving sprocket mounted on the output shaft of a servo motor, a driven sprocket fixed on a rotating rod, and a chain wound around the driving sprocket and the driven sprocket.

7. The injection mold with a positioning cavity for an injection molding machine according to claim 6, characterized in that: The transmission ratio of the driving sprocket to the driven sprocket is greater than 1.

8. The injection mold with a positioning cavity for an injection molding machine according to claim 7, characterized in that: A vertical limiting groove is provided on the fixed mold, and a limiting rod is fixedly connected to the bottom of the push plate, and the limiting rod is passed through the limiting groove.

9. The injection mold with a positioning cavity for an injection molding machine according to claim 8, characterized in that: There are eight springs, which are arranged in groups of four and four and symmetrically on the left and right.

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