Direct drive injection mechanism of micro-precision injection molding machine

Abstract

This utility model relates to the field of injection molding machine technology, specifically a direct-drive injection mechanism for a micro precision injection molding machine. The mechanism includes a frame, barrel, screw rod, connecting shaft, support plate, servo motor, rotating shaft, connecting assembly, and limiting assembly. The barrel is mounted on the frame and contains the screw rod with a feed inlet. The connecting shaft is connected to the screw rod, the support plate is slidably connected to the frame, and the servo motor is fixed to the support plate via a mounting assembly. The rotating shaft is connected to the output shaft of the servo motor and has a limiting protrusion; the connecting assembly connects the rotating shaft to the connecting shaft. The limiting assembly is mounted on the frame to limit the movement of the support plate. The servo motor directly drives the connecting shaft and screw rod to rotate via the rotating shaft and connecting assembly. The connecting assembly includes an upper semi-cylindrical tube and a lower semi-cylindrical tube, fixed by a threaded ring. The limiting block of the limiting assembly mates with the limiting hole of the support plate and the rectangular groove of the mounting base.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine technology, and in particular to a direct-drive injection mechanism for a micro precision injection molding machine. Background Technology

[0002] In the field of injection molding, miniature precision injection molding machines are widely used in the production of small plastic products in industries such as electronics, medical, and toys due to their small size and high precision. The direct-drive injection mechanism, as a key component of miniature precision injection molding machines, directly affects the machine's performance and injection quality.

[0003] Traditional direct-drive injection molding mechanisms have several problems. In terms of power transmission, they often employ indirect drive, using complex transmission devices to transfer power from the motor to the auger. This transmission method not only increases energy loss and reduces transmission efficiency, but also, due to the large number of transmission components, is prone to wear and loosening, leading to decreased transmission accuracy and affecting the stability of the injection molding process and the quality of the molded products.

[0004] In terms of installation and disassembly, traditional structures typically employ fixed connections, making the installation and disassembly of the connection components between the servo motor and the screw cumbersome. When maintenance, replacement, or position adjustment of the servo motor is required, a large number of parts need to be disassembled, consuming significant time and manpower, thus reducing the equipment's maintenance efficiency and operational flexibility.

[0005] Furthermore, traditional direct-drive injection mechanisms lack effective limiting and adjustment mechanisms. During equipment operation, the movement of the servo motor and support plate lacks precise limits, which can easily lead to equipment instability and even safety accidents. At the same time, it is difficult to quickly adjust equipment parameters to meet different injection molding requirements, limiting the equipment's applicability. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as increased energy loss and reduced transmission efficiency due to indirect drive methods, cumbersome installation and disassembly of the connection components between the servo motor and the screw, and the lack of effective limiting and adjustment mechanisms in traditional direct-drive injection mechanisms. Therefore, this invention proposes a direct-drive injection mechanism for a micro precision injection molding machine.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A direct-drive injection mechanism for a miniature precision injection molding machine includes a frame, a barrel mounted on the frame, a helical rod inside the barrel, and a feed inlet on the barrel. A connecting shaft is mounted on the frame and connected to the screw rod; The support plate is slidably connected to the frame; A servo motor is mounted on the support plate via a mounting assembly. A rotating shaft is connected to the output shaft of the servo motor, and the rotating shaft is provided with a limit protrusion. A connecting component connects the rotating shaft to the connecting shaft; A limiting component is mounted on the frame to limit the position of the support plate. The servo motor directly drives the connecting shaft and the screw rod to rotate through the rotating shaft and the connecting component, thereby achieving direct-drive injection.

[0008] In one possible design, the mounting assembly includes a mounting base connected to a servo motor, mounting plates on both sides of the mounting base, the mounting plates being connected to a support plate by screws, a rectangular groove at the bottom of the mounting base, and limit holes inside the support plate.

[0009] In one possible design, the connecting assembly includes an upper semi-cylindrical tube and a lower semi-cylindrical tube, which cooperate to form a space to accommodate the rotating shaft and the connecting shaft. A limiting groove is formed on the inner wall of the upper semi-cylindrical tube, which cooperates with a limiting protrusion of the rotating shaft. A positioning strip is provided on the upper semi-cylindrical tube, and the positioning strip is connected to the connecting shaft.

[0010] In one possible design, the outer walls of the upper and lower semi-cylindrical cylinders are provided with threaded sections, and the threaded sections are fitted with threaded rings.

[0011] In one possible design, the limiting component includes a fixed horizontal plate mounted on a frame, a fixed vertical plate provided on the fixed horizontal plate, and a sliding base plate slidably connected to the fixed vertical plate.

[0012] In one possible design, a triangular plate is slidably connected to the fixed horizontal plate, and an adjusting screw is rotatably connected between the fixed vertical plate and the frame. The adjusting screw is threaded through the triangular plate, and the triangular plate is in contact with the sliding base plate. Rotating the adjusting screw causes the triangular plate to move, thereby controlling the position of the sliding base plate and the limit block.

[0013] In one possible design, the sliding base plate is provided with two limiting blocks, which cooperate with two limiting holes of the support plate and two rectangular slots of the mounting base to limit the movement range of the support plate and the servo motor.

[0014] In one possible design, the frame is provided with a protective cover, the interior of which accommodates the connecting shaft.

[0015] In one possible design, the support plate is slidably connected to the frame via a slider and a slide rail.

[0016] In this application, during use, by starting the servo motor, the output shaft of the servo motor drives the rotating shaft to rotate, and the rotating shaft drives the upper and lower cylindrical cylinders to rotate. The upper and lower cylindrical cylinders are engaged inside the connecting shaft, and then the connecting shaft drives the screw rod to rotate, thereby realizing the feeding process. When disassembly is required, the adjusting screw can be turned. The output shaft of the adjusting screw drives the triangular plate to move. The triangular plate no longer resists the sliding base plate. At this time, the sliding base plate moves down, and the sliding base plate drives the limit block to move down. The limit block moves out from the limit hole and the inside of the rectangular groove, releasing the braking state on the mounting base. At this time, the servo motor and the support plate can be moved laterally. After the servo motor is moved out, the threaded ring is rotated so that the threaded ring moves from the threaded section of the upper and lower cylindrical cylinders to the flat section. At this time, the lower cylindrical cylinder can be pushed out, and then the upper cylindrical cylinder can be taken out, which is convenient to use.

[0017] Beneficial effects: In the direct-drive injection mechanism of this miniature precision injection molding machine, the output shaft of the servo motor is directly connected to the connecting assembly via a rotating shaft, thereby driving the auger to rotate. This direct-drive method reduces intermediate transmission links, lowers energy loss, and improves transmission efficiency, enabling the auger to feed material into the barrel more quickly and accurately, thus enhancing the stability of the injection molding process and the quality of the injection molded products.

[0018] The mounting components facilitate easier installation and removal of the servo motor. The mounting base is fixed to the support plate with screws, and when the servo motor needs to be removed, simply loosen the screws to separate the mounting base from the support plate. Simultaneously, the connecting assembly employs a structure where the upper and lower cylindrical sections mate. The separation and assembly of the upper and lower cylindrical sections can be achieved by rotating the threaded ring, facilitating the removal of the connecting assembly from the connecting shaft. This significantly reduces equipment maintenance and replacement time, improving the equipment's operational flexibility.

[0019] The limit assembly provides precise positioning for the support plate and servo motor. The fixed vertical plate on the fixed horizontal plate is slidably connected to the sliding base plate. The limit block at the top of the sliding base plate works in conjunction with the limit hole and rectangular groove at the bottom of the mounting base to effectively limit the movement range of the support plate and servo motor, preventing the equipment from shaking or shifting during operation and ensuring the stability and safety of the equipment.

[0020] The limit components can be adjusted by adjusting the screw. Turning the screw moves the triangular plate, thereby controlling the position of the sliding base plate and the limit block. When it is necessary to adjust the position of the servo motor or to debug the equipment, the position of the limit block can be flexibly adjusted according to actual needs to meet the injection molding requirements of different specifications, thus expanding the applicability of the equipment. Attached Figure Description

[0021] Figure 1This is a three-dimensional structural schematic diagram of a direct-drive injection mechanism for a micro precision injection molding machine proposed in this utility model. Figure 2 This is a three-dimensional structural diagram of the servo motor and support plate in the direct-drive injection mechanism of a micro precision injection molding machine proposed in this utility model. Figure 3 An exploded view of the servo motor and support plate in the direct-drive injection mechanism of a micro precision injection molding machine proposed in this utility model. Figure 4 This is an exploded view of the upper and lower semi-cylindrical cylinders in the direct-drive injection mechanism of a micro precision injection molding machine proposed in this utility model.

[0022] In the diagram: 1. Frame; 2. Support plate; 3. Servo motor; 4. Protective cover; 5. Feed inlet; 6. Screw rod; 7. Machine barrel; 8. Connecting shaft; 9. Upper semi-cylindrical cylinder; 10. Adjusting screw; 11. Limiting protrusion; 12. Rotating shaft; 13. Mounting plate; 14. Rectangular groove; 15. Mounting base; 16. Triangular plate; 17. Fixed horizontal plate; 18. Fixed vertical plate; 19. Sliding base plate; 20. Limiting block; 21. Limiting hole; 22. Threaded ring; 23. Positioning strip; 24. Lower semi-cylindrical cylinder; 25. Limiting groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] In one embodiment: Refer to Figure 1-4 An injection mechanism, the specific implementation of which is as follows: This direct-drive injection molding mechanism includes a frame 1, which is made of high-strength alloy steel to ensure the stability and rigidity of the overall structure. A barrel 7, made of high-quality stainless steel, is bolted to one side of the top of the frame 1, providing excellent corrosion resistance and wear resistance. A rotating auger 6, made of high-hardness alloy steel and precision-machined, runs through the inside of the barrel 7 to reduce friction with the material and improve feeding efficiency. A feed inlet 5 is located at the top of the barrel 7 for feeding the plastic raw materials required for injection molding.

[0025] A protective cover 4 is also fixedly installed on one side of the top of the frame 1. The protective cover 4 facilitates observation of the internal structure and also provides a certain degree of protection. A connecting shaft 8 is fixedly installed inside the protective cover 4 by bolts. One end of the screw rod 6 is connected to one end of the connecting shaft 8 through a coupling to realize the transmission of power.

[0026] A support plate 2 is slidably connected to the top of the frame 1 via a slider and a slide rail. A servo motor 3 is fixedly mounted on the top of the support plate 2 via a mounting assembly. The mounting assembly includes a mounting base 15 fixedly mounted on the bottom of the servo motor 3. The mounting base 15 is made of cast iron to ensure sufficient strength. Mounting plates 13 are fixedly mounted on both sides of the mounting base 15. The mounting plates 13 are fixedly connected to the support plate 2 with screws to achieve a reliable connection between the servo motor 3 and the support plate 2. Two symmetrically arranged rectangular slots 14 are opened at the bottom of the mounting base 15, and two symmetrically arranged limiting holes 21 are opened inside the support plate 2 for use with the limiting assembly to limit the movement of the support plate 2 and the servo motor 3.

[0027] The output shaft of the servo motor 3 is fixedly mounted with a rotating shaft 12. The rotating shaft 12 is made of high-quality carbon steel and has undergone heat treatment to improve its overall mechanical properties. A limiting protrusion 11 is integrally formed on the outer wall of the rotating shaft 12, which cooperates with the connecting assembly to transmit power. The rotating shaft 12 is connected to one end of the connecting shaft 8 via a connecting assembly, which includes an upper semi-cylindrical cylinder 9 and a lower semi-cylindrical cylinder 24. The lower semi-cylindrical cylinder 24 and the upper semi-cylindrical cylinder 9 cooperate to form a complete cylindrical structure. A limiting groove 25 is formed on the inner top wall of the upper semi-cylindrical cylinder 9. The limiting groove 25 matches the limiting protrusion 11 on the rotating shaft 12, ensuring that the rotating shaft 12 can drive the upper semi-cylindrical cylinder 9 and the lower semi-cylindrical cylinder 24 to rotate synchronously. A positioning strip 23 is integrally formed on the top of the upper semi-cylindrical cylinder 9, which connects to the connecting shaft 8 to achieve a reliable connection between the connecting assembly and the connecting shaft 8. The outer wall of the upper cylindrical tube 9 is fitted with a threaded ring 22. The outer walls of both the upper cylindrical tube 9 and the lower cylindrical tube 24 are provided with threaded sections. The threaded ring 22 cooperates with the threaded sections to fix the upper cylindrical tube 9 and the lower cylindrical tube 24.

[0028] In operation, the servo motor 3 is started, and its output shaft drives the rotating shaft 12 to rotate. The limiting protrusion 11 on the rotating shaft 12 is embedded in the limiting groove 25 of the upper semi-cylindrical cylinder 9, causing the upper semi-cylindrical cylinder 9 and the lower semi-cylindrical cylinder 24 to rotate. The upper semi-cylindrical cylinder 9 and the lower semi-cylindrical cylinder 24 are engaged inside the connecting shaft 8, which in turn drives the screw rod 6 to rotate, thus realizing the feeding process. This direct-drive method reduces intermediate transmission links, lowers energy loss, and improves transmission efficiency, enabling the screw rod 6 to feed materials into the barrel 7 more quickly and accurately, thereby improving the stability of the injection molding process and the quality of the injection molded products.

[0029] A limiting assembly for limiting the support plate 2 is fixedly installed on the inner wall of the frame 1. The limiting assembly includes a fixed horizontal plate 17 fixedly installed on one side of the inner wall of the frame 1. The fixed horizontal plate 17 is made of steel plate to ensure sufficient strength. A fixed vertical plate 18 is fixedly installed at the top end of the fixed horizontal plate 17. The fixed vertical plate 18 is connected to the fixed horizontal plate 17 by welding to ensure the stability of the structure. A sliding base plate 19 is slidably connected to one side of the fixed vertical plate 18. The sliding base plate 19 is made of aluminum alloy and has a smooth surface to reduce friction.

[0030] A triangular plate 16 is slidably connected to the top of the fixed horizontal plate 17. One side of the fixed vertical plate 18 is rotatably connected to the inside of the frame 1 by the same adjusting screw 10. The adjusting screw 10 is threaded through the triangular plate 16, which cooperates with the sliding base plate 19. During equipment operation, the limiting block 20 is embedded in the limiting hole 21 and the rectangular groove 14, effectively limiting the movement range of the support plate 2 and the servo motor 3, preventing the equipment from shaking or shifting during operation, and ensuring the stability and safety of equipment operation.

[0031] When maintenance, replacement, or position adjustment of the servo motor 3 is required, the adjusting screw 10 is rotated. The rotation of the adjusting screw 10 causes the triangular plate 16 to move along the fixed horizontal plate 17. The triangular plate 16 no longer contacts the sliding base plate 19. At this time, the sliding base plate 19 moves downwards under gravity, causing the limiting block 20 to move downwards. The limiting block 20 moves out of the limiting hole 21 and the rectangular groove 14, releasing the braking state on the mounting base 15. The servo motor 3 and support plate 2 can then be moved laterally to remove the servo motor 3. After removing the servo motor 3, the threaded ring 22 is rotated, causing it to move from the threaded sections of the upper semi-cylindrical cylinder 9 and the lower semi-cylindrical cylinder 24 to the flat section. The lower semi-cylindrical cylinder 24 can then be pushed out, and the upper semi-cylindrical cylinder 9 can be removed, completing the disassembly of the connecting assembly. This design simplifies the installation and disassembly process of the servo motor 3 and the connecting assembly, greatly shortening the maintenance and replacement time of the equipment and improving the flexibility of equipment use. Meanwhile, the limit component can be adjusted by adjusting screw 10. When it is necessary to adjust the position of servo motor 3 or to debug the equipment, the position of limit block 20 can be flexibly adjusted according to actual needs to meet the injection molding requirements of different specifications and expand the applicability of the equipment.

[0032] This application can be used in the field of injection molding machines, or in other fields applicable to this application.

[0033] In another embodiment: Reference Figure 1-4A direct-drive injection mechanism for a micro precision injection molding machine is used in the field of injection molding machines. Two symmetrically arranged limiting blocks 20 are fixedly installed on the top of the sliding base plate 19. The limiting blocks 20 are used in conjunction with the limiting holes 21 and the rectangular groove 14 to limit the movement range of the support plate 2 and the servo motor 3.

[0034] However, as is well known to those skilled in the art, the working principle and wiring method of the servo motor 3 are conventional methods or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A direct-drive injection mechanism for a miniature precision injection molding machine, characterized in that, include: A frame (1) is provided with a cylinder (7) installed on the frame (1), a screw rod (6) is provided inside the cylinder (7), and a feed inlet (5) is provided in the cylinder (7). A connecting shaft (8) is mounted on the frame (1) and connected to the screw rod (6); Support plate (2) is slidably connected to the frame (1); The servo motor (3) is mounted on the support plate (2) via a mounting assembly; A rotating shaft (12) is connected to the output shaft of the servo motor (3), and the rotating shaft (12) is provided with a limit protrusion (11). A connecting component is used to connect the rotating shaft (12) to the connecting shaft (8); A limiting component is provided on the frame (1) to limit the support plate (2). The servo motor (3) directly drives the connecting shaft (8) and the screw rod (6) to rotate through the rotating shaft (12) and the connecting component to achieve direct-drive injection.

2. The direct-drive injection mechanism of the micro precision injection molding machine according to claim 1, characterized in that, The mounting assembly includes a mounting base (15), which is connected to a servo motor (3). Mounting plates (13) are provided on both sides of the mounting base (15). The mounting plates (13) are connected to the support plate (2) by screws. A rectangular groove (14) is provided at the bottom of the mounting base (15). A limit hole (21) is provided inside the support plate (2).

3. The direct-drive injection mechanism of the micro precision injection molding machine according to claim 1, characterized in that, The connecting assembly includes an upper semi-cylindrical tube (9) and a lower semi-cylindrical tube (24). The upper semi-cylindrical tube (9) and the lower semi-cylindrical tube (24) cooperate to form a space to accommodate the rotating shaft (12) and the connecting shaft (8). A limiting groove (25) is provided on the inner wall of the upper semi-cylindrical tube (9). The limiting groove (25) cooperates with the limiting protrusion (11) of the rotating shaft (12). The upper semi-cylindrical tube (9) is provided with a positioning strip (23). The positioning strip (23) is connected to the connecting shaft (8).

4. The direct-drive injection mechanism of the micro precision injection molding machine according to claim 3, characterized in that, The outer walls of the upper semi-cylindrical tube (9) and the lower semi-cylindrical tube (24) are provided with threaded sections, and the threaded sections are fitted with threaded rings (22).

5. The direct-drive injection mechanism of the micro precision injection molding machine according to claim 1, characterized in that, The limiting component includes a fixed horizontal plate (17), which is mounted on the frame (1). A fixed vertical plate (18) is provided on the fixed horizontal plate (17), and a sliding base plate (19) is slidably connected to the fixed vertical plate (18).

6. The direct-drive injection mechanism of the micro precision injection molding machine according to claim 5, characterized in that, A triangular plate (16) is slidably connected to the fixed horizontal plate (17). An adjusting screw (10) is rotatably connected between the fixed vertical plate (18) and the frame (1). The adjusting screw (10) is threaded through the triangular plate (16). The triangular plate (16) is in contact with the sliding base plate (19). Rotating the adjusting screw (10) causes the triangular plate (16) to move, thereby controlling the position of the sliding base plate (19) and the limiting block (20).

7. The direct-drive injection mechanism of the micro precision injection molding machine according to claim 5, characterized in that, Two limiting blocks (20) are provided on the sliding base plate (19). The limiting blocks (20) cooperate with the two limiting holes (21) of the support plate (2) and the two rectangular slots (14) of the mounting base (15) to limit the movement range of the support plate (2) and the servo motor (3).

8. The direct-drive injection mechanism of the micro precision injection molding machine according to claim 1, characterized in that, The frame (1) is provided with a protective cover (4), and the protective cover (4) accommodates the connecting shaft (8).

9. The direct-drive injection mechanism of the micro precision injection molding machine according to claim 1, characterized in that, The support plate (2) is slidably connected to the frame (1) via a slider and a slide rail.

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