An injection molding device with screw reverse rotation function

Abstract

This invention discloses an injection molding device with a screw reverse rotation function. This device aims to solve the problem of existing injection molding devices that use hydraulic cylinder retraction to prevent resin leakage from the nozzle. However, the inability to precisely control the retraction accuracy reduces product quality. The device includes a base, a moving module, a fixed module, and an injection assembly. The moving module includes a first frame fixedly connected to the left side of the upper surface of the base, a mold closing and opening / closing assembly mounted on the first frame, and a movable disc and a left mold fixedly connected to the output end of the mold closing and opening / closing assembly. This invention, by employing a screw mechanical structure, changes the power source of the retraction method to a general electric motor and screw. The drive motor causes the screw to rotate forward and backward, preventing resin leakage at the nozzle tip and preventing air from being drawn into the nozzle, resulting in stable molding quality and eliminating defects such as resin leakage, rolling, and stringing at the nozzle tip.

Description

Technical Field

[0001] This utility model belongs to the field of synthetic resin molding technology, specifically relating to an injection molding device with screw reverse rotation function. Background Technology

[0002] Injection molding, a key technology in the plastics processing field, is widely used in numerous industries such as automotive, electronics, medical, and packaging, playing a crucial role in the development of modern manufacturing. It efficiently and precisely transforms plastic raw materials into various complex shapes and precise dimensions of plastic products, meeting the diverse needs of different industries. From automotive interior parts to electronic product casings, from medical equipment components to everyday packaging containers, injection-molded products are ubiquitous, profoundly impacting people's production and lives.

[0003] Existing synthetic resin injection molding equipment generally follows a process of raw material input, metering, melting, injection, pressure holding, and molding. After metering or pressure holding, the hydraulic cylinder is activated to prevent resin leakage from the nozzle through the retraction of the hydraulic cylinder. However, because the retraction accuracy of the hydraulic cylinder cannot be precisely controlled, if the retraction is too large, air will be drawn into the nozzle from the nozzle tip, resulting in defective products in the next injection and reducing product quality. Utility Model Content

[0004] (1) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an injection molding device with a screw reverse rotation function. This device aims to solve the problem that existing injection molding devices prevent resin leakage from the nozzle by using a hydraulic cylinder retraction method, but the retraction accuracy cannot be precisely controlled, thus reducing product quality.

[0006] (2) Technical solution

[0007] To solve the above-mentioned technical problems, this utility model provides an injection molding device with screw reverse rotation function. The device includes a base, a moving module, a fixed module, and an injection assembly. The moving module includes a first frame fixedly connected to the left side of the upper surface of the base, a mold closing and opening assembly mounted on the first frame, a movable disk and a left mold fixedly connected to the output end of the mold closing and opening assembly. The fixed module includes a fixed disk fixedly connected to the middle of the upper surface of the base and a right mold mounted on the left side of the fixed disk. The injection assembly includes an injection driving cylinder fixedly connected to the right side of the upper surface of the base, a second frame mounted on the output end of the injection driving cylinder, and an injection unit mounted on the second frame.

[0008] The mold closing and opening / closing assembly includes a mold closing and opening / closing cylinder, a mold closing sensor, an opening sensor, and an air booster valve. The mold closing and opening / closing cylinder includes a cylinder body, an ejector rod, a mold closing piston and a protruding plate piston that are slidably installed inside the cylinder body. A fixing rod is fixedly connected to one side of the mold closing piston and passes through the cylinder body. One end of the ejector rod is fixedly connected to the protruding plate piston, and the other end of the ejector rod passes through the fixing rod.

[0009] The injection unit includes an injection nozzle and a drive motor mounted on a second frame. A hopper is mounted on the injection nozzle, and a screw is rotatably mounted inside the injection nozzle. The drive motor is used to rotate the screw.

[0010] Preferably, a first safety cover is provided on the outer surface of the first frame, and the first safety cover is equipped with a mold closing position adjustment rod, a mold closing light, a protrusion plate control button and a piston speed control button.

[0011] Furthermore, the output end of the drive motor is fixedly connected to a first pulley, and the other end of the screw passes through the second frame and is fixedly connected to a second pulley. The first pulley and the second pulley are connected by belt drive.

[0012] Furthermore, an extended nozzle is fixedly connected to the output end of the injection nozzle, and an indicator light and a material detection sensor corresponding to the hopper are installed on the second frame.

[0013] Furthermore, a second safety cover is provided on the outer surface of the second rack, and a touch screen is installed on the second safety cover.

[0014] Furthermore, heaters are installed on the outer surfaces of both the ejector nozzle and the extended nozzle, and thermocouple sensors are installed on the outer surfaces of the heaters.

[0015] Furthermore, the right side of the machine base is equipped with an indicator light connection port, a detection sensor connection port, a main control connection port, and a control box interface. The main control connection port is connected to the mold closing and opening / closing cylinder through an air booster valve.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model adopts a screw mechanical structure, changing the power source of the back suction method to a general electric motor and screw. The screw is rotated by driving the motor. When the screw rotates forward, the resin in the injection nozzle is compressed, which increases the pressure in the injection nozzle. When the screw rotates in reverse, the pressure in the injection nozzle decreases, so that there is no resin leakage at the front end of the extended nozzle and no air is drawn into the nozzle. This makes the molding quality stable and eliminates defects such as resin leakage, rolling, and stringing at the front end of the nozzle.

[0019] 2. This utility model uses a mold-closing cylinder to close the left and right molds, which not only ensures the generation of the maximum clamping force, but also avoids applying excessive force to the mold parting line. This method eliminates the need for auxiliary equipment such as hydraulic pumps, enabling the creation of a small injection molding machine. Once delivered, it can be put into use by connecting a power source and an air compressor. In addition, since there is no auxiliary equipment, the mold size tends to be smaller, and it can be easily moved when changes are needed in the factory layout. Attached Figure Description

[0020] Figure 1 This is a front view structural diagram of this utility model.

[0021] Figure 2 This is a structural schematic diagram of the installation safety cover of this utility model.

[0022] Figure 3 This is a schematic diagram of the right-side structure of this utility model.

[0023] Figure 4 This is a schematic diagram of the mold closing and opening / closing component of this utility model.

[0024] Figure 5 This is a schematic diagram of the mold closing and opening / closing cylinder of this utility model.

[0025] Figure 6 This is a schematic diagram of the injection molding component of this utility model.

[0026] Figure 7 This is a schematic diagram of the injection unit of this utility model.

[0027] Figure 8 This is a schematic diagram of the connection between the injection molding component and the fixed module of this utility model.

[0028] Figure 9 This is a schematic diagram of the connection between the fixed module and the movable module of this utility model.

[0029] Figure 10 This is a schematic diagram of the mold opening structure of the mobile module of this utility model.

[0030] The labels in the attached diagram are as follows: 1. Base; 2. Moving module; 3. Fixed module; 4. Injection assembly; 5. First frame; 6. Mold closing and opening / closing assembly; 7. Movable platen; 8. Left mold; 9. Fixed platen; 10. Right mold; 11. Injection drive cylinder; 12. Second frame; 13. Injection unit; 14. Mold closing and opening / closing cylinder; 15. Mold closing sensor; 16. Mold opening sensor; 17. Air booster valve; 18. Cylinder body; 19. Ejector rod; 20. Mold closing piston; 21. Protruding plate piston; 22. Fixed rod; 23. Injection nozzle; 24. Drive motor; 25. Hopper; 26. Screw; 501. First safety cover; 502. Mold closing position adjustment rod; 503. Mold closing light; 504. Protrusion plate control button; 505. Piston speed control button; 2401. First pulley; 2402. Second pulley; 2403. Belt; 2301. Extended nozzle; 2302. Heater; 2303. Thermocouple sensor; 1201. Indicator light; 1202. Material detection sensor; 1203. Second safety cover; 1204. Touch screen; 101. Indicator light connection port; 102. Detection sensor connection port; 103. Main control connection port; 104. Control box interface. Detailed Implementation

[0031] This specific embodiment is an injection molding device with a screw reverse rotation function, and its structural schematic diagram is shown below. Figures 1-10 As shown, the device includes a base 1, a movable module 2, a fixed module 3, and an injection assembly 4. The injection assembly 4 mainly functions to dissolve the resin raw material and then inject it into the mold under high pressure. The movable module 2 includes a first frame 5 fixedly connected to the left side of the upper surface of the base 1, a mold closing and opening / closing assembly 6 installed on the first frame 5, a movable disk 7 fixedly connected to the output end of the mold closing and opening / closing assembly 6, and a left mold 8. The fixed module 3 includes a fixed disk 9 fixedly connected to the middle of the upper surface of the base 1 and a right mold 10 installed to the left of the fixed disk 9. The injection assembly 4 includes an injection driving cylinder 11 fixedly connected to the right side of the upper surface of the base 1, a second frame 12 installed at the output end of the injection driving cylinder 11, and an injection unit 13 installed on the second frame 12.

[0032] The mold closing and opening / closing assembly 6 includes a mold closing and opening / closing cylinder 14, a mold closing sensor 15, a mold opening sensor 16, and an air booster valve 17. The mold closing and opening / closing assembly 6 fixes the mold in the molding machine and plays the role of fastening, opening and closing the mold, and cooling the molded product.

[0033] The mold closing cylinder 14 includes a cylinder body 18, a push rod 19, a mold closing piston 20 and a protruding plate piston 21 that are slidably installed inside the cylinder body 18. A fixed rod 22 is fixedly connected to one side of the mold closing piston 20 and passes through the cylinder body 18. One end of the push rod 19 is fixedly connected to the protruding plate piston 21, and the other end of the push rod 19 passes through the fixed rod 22. The mold closing piston 20, the protruding plate piston 21, the push rod 19 and the fixed rod 22 are all slidably sealed with the cylinder body 18, and the push rod 19 is slidably sealed with the fixed rod 22.

[0034] When the mold is closed, the air pressure acts on the mold closing piston 20, which drives the fixed rod 22, the movable plate 7 and the left mold 8 to move. When the product is ejected, the air pressure acts on the protruding plate piston 21, which drives the ejector rod 19 to move, causing the ejection assembly on the left mold 8 to move and eject the injection molded product.

[0035] Because this method of opening and closing the mold with a cylinder is chosen, a small injection molding machine can be realized without the need for auxiliary equipment such as hydraulic pumps. After delivery, it can be put into use by connecting a power supply and an air blower. In addition, since there is no auxiliary equipment, the mold size is also smaller, and it can be easily moved when the factory layout needs to be changed.

[0036] The injection unit 13 includes an injection nozzle 23 and a drive motor 24 mounted on the second frame 12. A hopper 25 is mounted on the injection nozzle 23, and a screw 26 is rotatably mounted inside the injection nozzle 23. The drive motor 24 is used to rotate the screw 26.

[0037] The screw 26 is rotated by the drive motor 24. When the screw 26 rotates forward, the resin in the injection nozzle 23 is compressed, which increases the pressure in the injection nozzle 23. When the screw 26 rotates in reverse, the pressure in the injection nozzle 23 decreases, so that there is no resin leakage at the front end of the extended nozzle 2301 and no air is drawn into the nozzle. This makes the molding quality stable and eliminates defects such as resin leakage, rolling, and stringing at the front end of the nozzle.

[0038] like Figure 1 and Figure 2As shown: In this embodiment, a first safety cover 501 is provided on the outer surface of the first frame 5. During production, a safety device is installed on the first safety cover 501. Therefore, if the first safety cover 501 is opened during automatic operation, it will immediately stop, allowing for safe production. The first safety cover 501 is equipped with a mold closing position adjustment rod 502, a mold closing light 503, a protrusion plate control button 504, and a piston speed control button 505. The mold closing light 503, the protrusion plate control button 504, and the piston speed control button 505 are all electrically connected to the control unit inside the machine base 1. After manual operation via the touch screen 1204, the preset program is executed in the order of injection standby, injection time, holding pressure time, screw reversal time, and cooling. The entire process is controlled according to the preset program set in the control unit. The injection time and holding time, which are important for injection molding, are rotated forward within the time set by the drive motor 24. When the screw 26 rotates in reverse, it rotates in reverse within the time set by the drive motor 24. Of course, each time setting can be set arbitrarily in the touch screen 1204.

[0039] If the mold closing light 503 is lit when the mold is closed, manually open the mold. If the light is not lit when the mold is closed, adjust the mold closing position adjustment rod 502 to light up the mold closing light 503. To adjust the mold opening and closing speed, use the protruding plate control button 504 and piston speed control button 505 on the inner side of the front.

[0040] like Figure 1 and Figure 6 As shown: In this embodiment, the output end of the drive motor 24 is fixedly connected to the first pulley 2401, and the other end of the screw 26 passes through the second frame 12 and is fixedly connected to the second pulley 2402. The first pulley 2401 and the second pulley 2402 are connected by a belt 2403.

[0041] like Figure 6 and Figure 7 As shown: In this embodiment, an extension nozzle 2301 is fixedly connected to the output end of the ejector nozzle 23. An indicator light 1201 and a material detection sensor 1202 corresponding to the hopper 25 are installed on the second frame 12. The material detection sensor can detect the material in the hopper 25 and replenish it in time.

[0042] like Figure 1 and Figure 2 As shown: In this embodiment, a second safety cover 1203 is provided on the outer surface of the second frame 12, and a touch screen 1204 is installed on the second safety cover 1203; thus, the heater 2302 and the drive part are also provided with the second safety cover 1203, so there is no risk of being caught or burned, and it can be used with confidence.

[0043] like Figure 6and Figure 7 As shown: In this embodiment, heaters 2302 are installed on the outer surfaces of both the injection nozzle 23 and the extension nozzle 2301, and thermocouple sensors 2303 are installed on the outer surfaces of the heaters 2302. The temperature control of the injection nozzle 23 and the extension nozzle 2301 is controlled by the thermocouple sensors 2303 installed on the heaters 2302. In order to achieve automated production, the extension nozzle 2301 must keep in contact with the mold. Therefore, the injection unit 13 must be able to move along the X-axis. For this purpose, the drive motor 24 of the injection unit 13 is installed at the rear.

[0044] like Figure 1 and Figure 3 As shown: In this embodiment, the right side of the base 1 is equipped with an indicator light connection port 101, a detection sensor connection port 102, a main control connection port 103, and a control box interface 104. The main control connection port 103 is connected to the mold closing cylinder 14 through an air booster valve 17. When the air pressure of the mold closing cylinder 14 is currently 0.5 MPa, the mold closing pressure is about 0.6 tons. By setting the air booster valve 17, the air pressure can be doubled, reaching a mold closing pressure of about 1.2 tons. In addition, the mold closing force can be freely changed by changing the inner diameter of the mold closing cylinder 14.

[0045] Working principle: First, the mold is set on the movable plate 7 and the fixed plate 9. Then, the resin raw material is put into the hopper 25. Next, the mold closing cylinder 14 is manually operated through the touch screen 1204 to drive the left mold 8 and the right mold 10 to close. At this time, the mold closing light 503 is lit. The mold closing sensor 15 transmits the signal to the control unit. Then, the preset program is advanced in the order of injection standby, injection time, holding pressure time, screw reversal time and cooling. At this time, the resin raw material is supplied from the lower opening to the screw 26 set in the injection nozzle 23. The screw 26 is equipped with a drive motor 24. The resin raw material is supplied to the screw 26 and is mixed and plasticized by the heater 2302 directly set on the injection nozzle 23 and the extension nozzle 2301 and the shear heat generated by the rotation of the screw 26. During the plasticizing process, it is compressed and conveyed synchronously to the extension nozzle 2301 until the injection molding is completed. After the process is completed, the mold is opened. Then, the ejector plate piston 21 drives the ejector rod 19 to move and the ejection component on the left mold 8 to eject the injection molded product.

[0046] All technical features in this embodiment can be freely combined according to actual needs.

[0047] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. An injection molding apparatus with screw reverse rotation function, the apparatus comprising a base (1), a moving module (2), a fixed module (3), and an injection assembly (4), characterized in that: The movable module (2) includes a first frame (5) fixedly connected to the left side of the upper surface of the base (1), a mold closing and opening / closing assembly (6) installed on the first frame (5), a movable disk (7) and a left mold (8) fixedly connected to the output end of the mold closing and opening / closing assembly (6). The fixed module (3) includes a fixed disk (9) fixedly connected to the middle of the upper surface of the base (1) and a right mold (10) installed on the left side of the fixed disk (9). The injection assembly (4) includes an injection driving cylinder (11) fixedly connected to the right side of the upper surface of the base (1), a second frame (12) installed at the output end of the injection driving cylinder (11), and an injection unit (13) installed on the second frame (12). The mold closing and opening / closing assembly (6) includes a mold closing and opening / closing cylinder (14), a mold closing sensor (15), a mold opening sensor (16), and an air booster valve (17). The mold closing and opening / closing cylinder (14) includes a cylinder body (18), a push rod (19), a mold closing piston (20) and a protruding plate piston (21) that are slidably installed inside the cylinder body (18). A fixing rod (22) is fixedly connected to one side of the mold closing piston (20) and passes through the cylinder body (18). One end of the push rod (19) is fixedly connected to the protruding plate piston (21), and the other end of the push rod (19) passes through the fixing rod (22). The injection unit (13) includes an injection nozzle (23) and a drive motor (24) mounted on a second frame (12). A hopper (25) is mounted on the injection nozzle (23). A screw (26) is rotatably mounted inside the injection nozzle (23). The drive motor (24) is used to rotate the screw (26).

2. The injection molding apparatus having a screw reverse rotation function according to claim 1, characterized by, The outer surface of the first frame (5) is provided with a first safety cover (501), and the first safety cover (501) is equipped with a mold closing position adjustment rod (502), a mold closing light (503), a protrusion plate control button (504) and a piston speed control button (505).

3. The injection molding apparatus having a screw reverse rotation function according to claim 2, characterized by, The output end of the drive motor (24) is fixedly connected to a first pulley (2401), and the other end of the screw (26) passes through the second frame (12) and is fixedly connected to a second pulley (2402). The first pulley (2401) and the second pulley (2402) are connected by a belt (2403).

4. The injection molding apparatus having a screw reverse rotation function according to claim 3, characterized by An extension nozzle (2301) is fixedly connected to the output end of the ejector nozzle (23), and an indicator light (1201) and a material detection sensor (1202) corresponding to the hopper (25) are installed on the second frame (12).

5. The injection molding apparatus having a screw reverse rotation function according to claim 4, characterized by The outer surface of the second frame (12) is provided with a second safety cover (1203), and a touch screen (1204) is installed on the second safety cover (1203).

6. The injection molding apparatus having a screw reverse rotation function according to claim 5, wherein Heaters (2302) are installed on the outer surfaces of both the ejector nozzle (23) and the extension nozzle (2301), and thermocouple sensors (2303) are installed on the outer surfaces of the heaters (2302).

7. The injection molding apparatus with screw reverse rotation function according to claim 6, characterized in that, The right side of the base (1) is provided with a signal lamp connecting port (101), a detection sensor connecting port (102), a main control connecting port (103) and a control box interface (104), wherein the main control connecting port (103) is communicated with the mold closing and opening cylinder (14) through an air pressure increasing valve (17).

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