Injection molding device for plastic shell production and method thereof

Abstract

The invention provides an injection molding device and method for plastic shell production, and relates to the field of injection molding.The device comprises a melting mechanism for melting plastic, a mold assembly for mold fixing and an injection mechanism for injection molding; the injection mechanism comprises a driving mechanism, a rotating mounting frame, a telescopic frame, a hinge seat, a driving assembly, a first motor and an injection head, the driving mechanism is fixed to the melting mechanism, and the rotating mounting frame is fixed to the output end of the driving mechanism; the rotary mounting frame is arranged for bearing the multiple sets of injection mechanisms, so that the device can conduct injection molding on multiple positions at the same time, the injection molding time of a grinding tool is greatly shortened, meanwhile, the device is matched with a driving assembly, a telescopic frame and a first motor through a driving mechanism, and therefore the position of an injection head is adjusted; and the device can be suitable for injection molding of rectangular, circular and polygonal molds, and the application range of the device is greatly widened.

Description

TECHNICAL FIELD

[0001] The application relates to the injection molding technical field, in particular to a plastic shell production injection molding device and a method thereof. BACKGROUND

[0002] Plastic is a high molecular compound polymerized by monomers as raw materials through polyaddition or polycondensation reaction, has medium anti-deformation capacity between fibers and rubber, and is composed of synthetic resins and additives such as fillers, plasticizers, stabilizers, lubricants and pigments. In the processing of plastic parts, the plastic molding of workpieces is often realized by using the injection molding process. With the development of society, in order to increase the injection rate of the mold and further increase the molding rate of the mold, the application provides a plastic shell production injection molding device and a method thereof to meet the needs of plastic production. SUMMARY

[0003] In view of the above problems, the application provides a plastic shell production injection molding device and a method thereof. The plastic shell production injection molding device is provided with a rotating mounting frame for bearing a plurality of injection mechanisms, so that the device can simultaneously perform injection molding at multiple places, greatly reducing the injection molding time of the mold. Meanwhile, the device adjusts the position of the injection head through the driving mechanism, the driving assembly, the telescopic frame and the first motor, so that it can be suitable for injection molding of rectangular, circular and polygonal molds, greatly increasing the use range of the device.

[0004] To achieve the purpose of the application, the application realizes the following technical scheme: a plastic shell production injection molding device, comprising a melting mechanism for melting plastic, a mold assembly for positioning, and an injection mechanism for injection molding. The injection mechanism comprises a driving mechanism, a rotating mounting frame, a telescopic frame, a hinged seat, a driving assembly, a first motor and an injection head. The driving mechanism is fixed on the melting mechanism. The output end of the driving mechanism is fixed with the rotating mounting frame. A plurality of telescopic frames are installed on the rotating mounting frame. One end of the telescopic frame is fixed with the hinged seat. The first motor is rotatably installed in the hinged seat. The hinged seat is provided with a driving assembly for driving the first motor to rotate. The output end of the first motor is fixedly connected with the injection head. The injection head comprises a heating sleeve, a pushing inner cylinder, a discharge cone, an electromagnetic valve and a cleaning piece. The output end of the first motor is connected with one end of the heating sleeve. The center position of the heating sleeve is provided with the pushing inner cylinder. One end of the pushing inner cylinder is connected with the discharge cone. The discharge cone is provided with the electromagnetic valve. The outer wall of the pushing inner cylinder is further provided with the cleaning piece. A plurality of output ports are arranged on the heating sleeve. The plurality of output ports are communicated with the pushing inner cylinder through first conduits. The heating sleeve is further provided with a feeding port communicated with the melting mechanism.

[0005] A further improvement is that the heating sleeve is provided with multiple sets of heating elements inside, and a temperature measuring ring is provided on the outer wall of the heating sleeve.

[0006] A further improvement is that a piston is provided inside the inner cylinder of the pusher, and a pusher is provided on the side of the piston away from the discharge cone.

[0007] Further improvements are made in that: the cleaning component includes a negative pressure chamber, a second conduit, and a water inlet pipe. The negative pressure chamber is fixed on the outer wall of the inner pusher cylinder. The negative pressure chamber is connected to the discharge cone through the second conduit. A check valve is provided at the second conduit. A water inlet pipe is also provided at one end of the inner pusher cylinder near the discharge cone.

[0008] A further improvement is that the telescopic frame includes an electric push rod, a telescopic rod, and a fixed plate. The electric push rod is fixed between the fixed plate and the hinge seat, and the telescopic rod is also fixed at the four corners between the fixed plate and the hinge seat.

[0009] Further improvements include: the rotating mounting bracket is cross-shaped, with four sets of sliding grooves distributed in a cross shape on one side of the rotating mounting bracket, and four sets of threaded rods rotatably mounted on the other side of the rotating mounting bracket at positions aligned with the sliding grooves. The injection head has five sets, and each threaded rod has a nut seat. One end of the nut seat is fixed with a connecting rod, which passes through the sliding groove and is fixedly connected to the fixing plate. The rotating mounting bracket also has four sets of second motors for driving the threaded rods to rotate respectively.

[0010] A further improvement is that the melting mechanism includes a support base and a melting chamber, the top of the support base is provided with the melting chamber, and the melting chamber is connected to the feed port through a metal telescopic tube.

[0011] A further improvement is that the rotating mounting frame is equipped with a fixing clamp to support the metal telescopic rod.

[0012] A further improvement is made in that: the mold assembly includes telescopic legs, a placement platform, a hydraulic cylinder, a pressure plate, a moving mold assembly, and a fixed mold assembly. The telescopic legs are provided with a placement platform, and a hydraulic cylinder is fixed to the side wall of the placement platform. A pressure plate is fixed to the output end of the hydraulic cylinder. One side of the pressure plate is in contact with the moving mold assembly, and the other side of the moving mold assembly is provided with a matching fixed mold assembly. The fixed mold assembly is provided with multiple sets of injection ports.

[0013] An injection molding method using an injection molding apparatus for producing plastic casings includes the following steps; S1. Mold closing: The mold is placed on the placement table, where the fixed mold group is fixed and the moving mold group is moved by the hydraulic cylinder pushing the pressure plate, so that the moving mold group and the fixed mold group are sealed and closed. S2. Adjust the injection head. Based on the position of the injection port on the fixed module, the drive mechanism is activated to rotate the rotating mounting bracket, thereby adjusting the position of the injection head. At the same time, the second motor drives the threaded rod to rotate, thereby adjusting the height of the injection head. Simultaneously, the drive assembly makes the injection head rotate within the hinge seat, so that the injection head and the telescopic frame are at a right angle. Then, the first electric push rod is driven to extend the telescopic rod and align the injection head with the injection port. Finally, the threaded rod is rotated to insert the discharge cone into the injection port. S3, Injection Molding: The molten material in the molten material chamber is sent into the heating sleeve through the metal telescopic tube. The temperature of the molten material is monitored by the temperature measuring ring. When the temperature is low, the heating element is activated to reheat the molten material to ensure the state of the molten material. Then, the molten material is sent into the pusher inner cylinder through the first guide tube. The solenoid valve is opened, and the molten material is sent into the mold assembly through the discharge cone by the pusher inner cylinder. S4. Cleaning: After injection molding, the negative pressure chamber blows air through the second conduit to blow air onto the discharge cone, sending out the remaining liquid material. This prevents the liquid material from caking and clogging the discharge cone after cooling. At the same time, water can be delivered into the inner pusher cylinder through the water inlet pipe to further clean the inner pusher cylinder and the discharge cone. Additionally, the cleaning liquid can be sent into the cooling chamber of the mold assembly to accelerate the cooling and molding of the plastic inside the mold assembly.

[0014] The beneficial effects of this invention are as follows: By setting a rotating mounting frame to support multiple injection mechanisms, this invention allows the device to perform injection molding at multiple locations simultaneously, greatly reducing the injection time of the mold. Simultaneously, the device, through a drive mechanism in conjunction with a drive assembly, a telescopic frame, and a first motor, adjusts the position of the injection head, making it suitable for injection molding of rectangular, circular, and polygonal molds, significantly increasing the device's applicability. Furthermore, the inner pusher cylinder can transport the molten material via a spiral feeding method or a piston extrusion method, while the heating sleeve can further heat the molten material, compensating for heat loss during the process of transporting the molten material from the melting mechanism to the injection mechanism, ensuring the state of the molten material during injection molding, and thus improving the injection molding effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the operation of the present invention; Figure 2 This is a schematic diagram of the injection head after adjustment according to the present invention; Figure 3 This is a schematic diagram of the structure on the rotating mounting bracket of the present invention; Figure 4 This is a schematic diagram of the injection mechanism of the present invention; Figure 5 This is a cross-sectional view of the injection head of the present invention.

[0016] The components are as follows: 1. Drive assembly; 2. Rotating mounting bracket; 3. Telescopic bracket; 4. Hinge seat; 5. First motor; 6. Heating sleeve; 7. Pushing inner cylinder; 8. Discharge cone; 9. Solenoid valve; 10. First guide tube; 11. Feed inlet; 12. Heating element; 13. Temperature measuring ring; 14. Piston; 15. Pushing component; 16. Negative pressure chamber; 17. Second guide tube; 18. Water inlet pipe; 19. Electric push rod; 20. Telescopic rod; 21. Fixing plate; 22. Slide groove; 23. Threaded rod; 24. Nut seat; 25. Connecting rod; 26. Second motor; 27. Support seat; 28. Melting chamber; 29. ​​Metal telescopic tube; 30. Fixing clamp; 31. Telescopic support leg; 32. Placement platform; 33. Hydraulic cylinder; 34. Pressure plate; 35. Moving module; 36. Fixed module; 37. Drive assembly. Detailed Implementation

[0017] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0018] according to Figures 1-5 As shown, this embodiment proposes an injection molding device for producing plastic shells, including a melting mechanism for melting plastic, a mold assembly for fixing the mold, and an injection mechanism for injection molding. The injection mechanism includes a drive mechanism 1, a rotating mounting frame 2, a telescopic frame 3, a hinge seat 4, a drive assembly 37, a first motor 5, and an injection head. The drive mechanism 1 is fixed to the melting mechanism. The output end of the drive mechanism 1 is fixed to the rotating mounting frame 2. Multiple sets of telescopic frames 3 are mounted on the rotating mounting frame 2. One end of the telescopic frame 3 is fixed to the hinge seat 4. The first motor 5 is rotatably mounted inside the hinge seat 4. The outer wall of the hinge seat 4 is provided with a drive assembly 37 that drives the first motor 5 to rotate. The output end of the first motor 5 is fixedly connected to the injection head. The injection head includes a heating sleeve 6, a pusher inner cylinder 7, a piston 14, a pusher 15, a discharge cone 8, a solenoid valve 9, and a cleaning component. The output end of the first motor 5 is connected to one end of the heating sleeve 6. The pusher inner cylinder 7 is located at the center of the heating sleeve 6. One end of the pusher inner cylinder 7 is connected to the discharge cone 8. The discharge cone 8 is equipped with a solenoid valve 9. The outer wall of the pusher inner cylinder 7 is also equipped with a cleaning component. The heating sleeve 6 is provided with multiple sets of output ports, which are connected to the inner pusher cylinder 7 through a first conduit 10. The heating sleeve 6 is also provided with a feed port 11 that is connected to the melting mechanism.

[0019] This device uses a rotating mounting frame 2 to support multiple injection mechanisms, allowing for simultaneous injection at multiple locations and significantly reducing mold injection time. Furthermore, the device, through a drive mechanism 1 in conjunction with a drive assembly 37, a telescopic frame 3, and a first motor 5, adjusts the position of the injection head to accommodate rectangular, circular, and polygonal molds, greatly expanding its application range. The inner pusher cylinder 7 can transport molten material via a spiral feed or piston 14 compression, while the heating sleeve 6 further heats the molten material, compensating for heat loss during delivery from the melting mechanism to the injection mechanism, ensuring the molten material's condition during injection, and thus improving the injection molding effect.

[0020] The heating sleeve 6 is provided with multiple sets of heating elements 12 inside, and a temperature measuring ring 13 is provided on the outer wall of the heating sleeve 6. The temperature sensing ring 13 is designed to monitor the temperature of the molten material in real time. When the temperature of the molten material is low, it can be heated by the heating element 12.

[0021] The inner cylinder 7 is equipped with a piston 14, and the piston 14 is provided with a pusher 15 on the side away from the discharge cone 8.

[0022] The piston 14 extrusion method is more suitable for injection molding of small-volume plastic shells. For some large-volume plastic shells, a screw conveyor method is required for injection molding. The specific structure of the screw conveyor is existing technology and will not be described in detail here.

[0023] The cleaning component includes a negative pressure chamber 16, a second conduit 17, and a water inlet pipe 18. The negative pressure chamber 16 is fixed on the outer wall of the inner pusher cylinder 7. The negative pressure chamber 16 is connected to the discharge cone 8 through the second conduit 17. A check valve is provided at the second conduit 17. The inner pusher cylinder 7 is also provided with a water inlet pipe 18 at one end near the discharge cone 8.

[0024] The negative pressure chamber 16, in conjunction with the second conduit 17, cleans the residual liquid on the discharge cone 8, preventing blockage after cooling. Simultaneously, water is supplied through the water supply pipe to the cavity inside the inner cylinder 7, cleaning the entire injection head and ensuring its cleanliness. This prevents residual liquid from affecting subsequent injection molding. Furthermore, since most molds on the market are equipped with cooling chambers to assist in rapid mold cooling, the cleaning liquid can be injected into the cooling chamber for reuse, reducing water waste and further reducing production costs.

[0025] The telescopic frame 3 includes an electric push rod 19, a telescopic rod 20, and a fixing plate 21. The electric push rod 19 is fixed between the fixing plate 21 and the hinge seat 4, and the telescopic rod 20 is also fixed at the four corners between the fixing plate 21 and the hinge seat 4.

[0026] The rotating mounting bracket 2 is cross-shaped. Four sets of sliding grooves 22 are distributed in a cross shape on one side of the rotating mounting bracket 2. Four sets of threaded rods 23 are rotatably installed on the other side of the rotating mounting bracket 2 at the position aligned with the sliding grooves 22. The injection head has five sets. Nut seats 24 are provided on the threaded rods 23. A connecting rod 25 is fixed to one end of the nut seat 24. The connecting rod 25 passes through the sliding grooves 22 and is fixedly connected to the fixing plate 21. The rotating mounting bracket 2 is also provided with four sets of second motors 26 for driving the threaded rods 23 to rotate respectively.

[0027] By starting the second motor 26, the second motor 26 drives the threaded rod 23 to rotate, which in turn drives the telescopic frame 3 to move through the nut sleeve, thereby moving the injection head and adjusting the position of the injection head.

[0028] The melting mechanism includes a support base 27 and a melting chamber 28. The top of the support base 27 is provided with the melting chamber 28, and the melting chamber 28 is connected to the feed port 11 through a metal telescopic tube 29.

[0029] The rotating mounting frame 2 is equipped with a fixing clamp 30 to support the metal telescopic rod 20.

[0030] The mold assembly includes a telescopic support leg 31, a placement platform 32, a hydraulic cylinder 33, a pressure plate 34, a moving mold assembly 35, and a fixed mold assembly 36. The telescopic support leg 31 is provided with a placement platform 32, and a hydraulic cylinder 33 is fixed on the side wall of the placement platform 32. A pressure plate 34 is fixed to the output end of the hydraulic cylinder 33. One side of the pressure plate 34 is in contact with the moving mold assembly 35, and the other side of the moving mold assembly 35 is provided with a matching fixed mold assembly 36. The fixed mold assembly 36 is provided with multiple sets of injection ports.

[0031] The injection molding method using the above-mentioned injection molding apparatus for producing plastic casings includes the following steps; S1. Mold closing: The mold is placed on the placement table 32, where the fixed mold group 36 is fixed and the moving mold group 35 is pushed by the hydraulic cylinder 33 to move the pressure plate 34, thereby sealing and closing the mold with the fixed mold group 36. S2. Adjust the injection head. Based on the position of the injection port on the fixed module 36, the driving mechanism 1 drives the rotating mounting frame 2 to rotate, thereby adjusting the position of the injection head. At the same time, the second motor 26 drives the threaded rod 23 to rotate, thereby adjusting the height of the injection head. Simultaneously, the driving assembly 37 makes the injection head rotate within the hinge seat 4, so that the injection head and the telescopic frame 3 are at a right angle. Then, the first electric push rod 19 is driven to extend the telescopic rod 20 and align the injection head with the injection port. Then, the threaded rod 23 is rotated to insert the discharge cone 8 into the injection port. S3, Injection molding: The molten material in the molten material chamber 28 is sent into the heating sleeve 6 through the metal telescopic tube 29. The temperature of the molten material is monitored by the temperature measuring ring 13. When the temperature is low, the heating element 12 is activated to reheat the molten material to ensure the state of the molten material. Then, the molten material is sent into the pusher inner cylinder 7 through the first conduit 10. The solenoid valve 9 is opened, and the molten material is sent into the mold assembly through the discharge cone 8 by the pusher inner cylinder 7. S4. Cleaning: After injection molding, the negative pressure chamber 16 blows air through the second conduit 17 to blow air onto the discharge cone 8, sending out the remaining liquid material. This prevents the liquid material from caking and clogging the discharge cone 8 after cooling. At the same time, water can be delivered into the pusher cylinder 7 through the water inlet pipe 18 to further clean the pusher cylinder 7 and the discharge cone 8. Additionally, the cleaning liquid can be sent into the cooling chamber of the mold assembly to accelerate the cooling and molding of the plastic in the mold assembly.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding apparatus for producing plastic shells, comprising a melting mechanism for melting plastic, a mold assembly for setting up a mold, and an injection mechanism for injection molding, characterized in that: The injection mechanism includes a drive mechanism (1), a rotating mounting frame (2), a telescopic frame (3), a hinge seat (4), a drive assembly (37), a first motor (5), and an injection head. The drive mechanism (1) is fixed on the melting mechanism. The output end of the drive mechanism (1) is fixed with a rotating mounting frame (2). Multiple sets of telescopic frames (3) are installed on the rotating mounting frame (2). One end of the telescopic frame (3) is fixed with a hinge seat (4). The first motor (5) is rotatably installed inside the hinge seat (4). The outer wall of the hinge seat (4) is provided with a drive assembly (37) that drives the first motor (5) to rotate. The output end of the first motor (5) is fixedly connected to the injection head. The injection head includes a heating sleeve (6), a pusher inner cylinder (7), a discharge cone (8), a solenoid valve (9), and a cleaning component. The output end of the first motor (5) is connected to one end of the heating sleeve (6). The pusher inner cylinder (7) is located at the center of the heating sleeve (6). One end of the pusher inner cylinder (7) is connected to the discharge cone (8). The discharge cone (8) is equipped with a solenoid valve (9). The outer wall of the pusher inner cylinder (7) is also equipped with a cleaning component. The heating sleeve (6) is provided with multiple sets of output ports, and the multiple sets of output ports are connected to the inner pusher cylinder (7) through the first conduit (10). The heating sleeve (6) is also provided with a feed port (11) connected to the melting mechanism.

2. The injection molding apparatus for producing plastic shells according to claim 1, characterized in that: The heating sleeve (6) is provided with multiple sets of heating elements (12) inside, and a temperature measuring ring (13) is provided on the outer wall of the heating sleeve (6).

3. The injection molding apparatus for producing plastic shells according to claim 1, characterized in that: The inner cylinder (7) of the pusher is provided with a piston (14), and the side of the piston (14) away from the discharge cone (8) is provided with a pusher (15).

4. The injection molding apparatus for producing plastic shells according to claim 1, characterized in that: The cleaning component includes a negative pressure chamber (16), a second conduit (17), and a water inlet pipe (18). The negative pressure chamber (16) is fixed on the outer wall of the inner pusher cylinder (7). The negative pressure chamber (16) is connected to the discharge cone (8) through the second conduit (17). A check valve is provided at the second conduit (17). The inner pusher cylinder (7) is also provided with a water inlet pipe (18) at one end near the discharge cone (8).

5. The injection molding apparatus for producing plastic shells according to claim 1, characterized in that: The telescopic frame (3) includes an electric push rod (19), a telescopic rod (20) and a fixed plate (21). The electric push rod (19) is fixed between the fixed plate (21) and the hinge seat (4). The telescopic rod (20) is also fixed at the four corners between the fixed plate (21) and the hinge seat (4).

6. The injection molding apparatus for producing plastic shells according to claim 1, characterized in that: The rotating mounting bracket (2) is cross-shaped. Four sets of sliding grooves (22) are distributed in a cross shape on one side of the rotating mounting bracket (2). Four sets of threaded rods (23) are rotatably installed on the other side of the rotating mounting bracket (2) at the position aligned with the sliding grooves (22). The injection head is provided with five sets. Nut seats (24) are provided on the threaded rods (23). A connecting rod (25) is fixed at one end of the nut seat (24). The connecting rod (25) passes through the sliding grooves (22) and is fixedly connected to the fixing plate (21). The rotating mounting bracket (2) is also provided with four sets of second motors (26) for driving the threaded rods (23) to rotate respectively.

7. The injection molding apparatus for producing plastic shells according to claim 6, characterized in that: The melting mechanism includes a support base (27) and a melting chamber (28). The top of the support base (27) is provided with a melting chamber (28), and the melting chamber (28) is connected to the feed port (11) through a metal telescopic tube (29).

8. The injection molding apparatus for producing plastic shells according to claim 1, characterized in that: The rotating mounting frame (2) is provided with a fixing clamp (30) to support the metal telescopic rod (20).

9. The injection molding apparatus for producing plastic shells according to claim 1, characterized in that: The mold assembly includes a telescopic support leg (31), a placement platform (32), a hydraulic cylinder (33), a pressure plate (34), a moving mold assembly (35), and a fixed mold assembly (36). The telescopic support leg (31) is provided with a placement platform (32). A hydraulic cylinder (33) is fixed on the side wall of the placement platform (32). A pressure plate (34) is fixed at the output end of the hydraulic cylinder (33). One side of the pressure plate (34) is in contact with the moving mold assembly (35). The other side of the moving mold assembly (35) is provided with a matching fixed mold assembly (36). The fixed mold assembly (36) is provided with multiple injection ports.

10. An injection molding method for an injection molding apparatus for producing plastic shells according to claims 1-9, characterized in that: Includes the following steps; S1. Mold closing: The mold is placed on the placement table (32), where the fixed mold group (36) is fixed and the moving mold group (35) is pushed by the hydraulic cylinder (33) to move the pressure plate (34), so that the moving mold group (35) and the fixed mold group (36) are sealed and closed. S2. Adjust the injection head. Based on the position of the injection port on the fixed module (36), the rotating mounting bracket (2) is rotated by starting the drive mechanism (1) to adjust the position of the injection head. At the same time, the threaded rod (23) is rotated by the second motor (26) to adjust the height of the injection head. Meanwhile, the injection head is rotated in the hinge seat (4) by the drive assembly (37) so that the injection head and the telescopic frame (3) are at right angles. Then, the telescopic rod (20) is extended by driving the first electric push rod (19) and the injection head is aligned with the injection port. Then, the discharge cone (8) is inserted into the injection port by rotating the threaded rod (23). S3, Injection molding: The molten material in the molten material chamber (28) is sent into the heating sleeve (6) through the metal telescopic tube (29). The temperature of the molten material is monitored by the temperature measuring ring (13). When the temperature is low, the heating element (12) is activated to reheat the molten material to ensure the state of the molten material. Then, the molten material is sent into the pusher inner cylinder (7) through the first conduit (10). The solenoid valve (9) is opened, and the molten material is sent into the mold assembly through the pusher inner cylinder (7) via the discharge cone (8). S4. Cleaning: After injection molding, the negative pressure chamber (16) blows air through the second conduit (17) to blow air onto the discharge cone (8) and send out the remaining liquid material, thereby preventing the liquid material from clogging the discharge cone (8) after cooling. At the same time, water can be delivered into the pusher cylinder (7) through the water inlet pipe (18) to further clean the pusher cylinder (7) and the discharge cone (8). At the same time, the cleaning liquid can be sent into the cooling chamber of the mold assembly to accelerate the cooling and molding of the plastic in the mold assembly.

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