Two-stage speed reduction electric pre-plasticizing device for injection molding machine

Abstract

The utility model relates to the field of injection molding machine manufacturing discloses a kind of secondary speed reduction electric pre-plastic device of injection molding machine, including the mounting seat of fixed installation on the rear plate of injection platform and the screw rotating on mounting seat, the side of mounting seat away from screw is provided with the third driven pulley of the coaxial rotation with screw, the two sides of mounting seat are respectively coaxial rotation with the first driven pulley of the same side with screw and the second driven pulley of the same side with third driven pulley above third driven pulley, driven pulley is rotatably arranged on the side of first driven pulley on mounting seat, driven pulley is connected with first driven pulley by first synchronous belt, second driven pulley is connected with third driven pulley by second synchronous belt, drive motor is provided on mounting seat, which drives driven pulley to rotate, the diameter of driven pulley is less than the diameter of first driven pulley;And the diameter of second driven pulley is less than the diameter of third driven pulley, the transmission performance of the device is improved, the structure is more compact and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine manufacturing, and in particular to a two-stage deceleration electric pre-plasticizing device for injection molding machines. Background Technology

[0002] Currently, the primary electric pre-plasticizing transmission device used in injection molding machines is mainly a primary synchronous reduction electric pre-plasticizing device. A power input mechanism for a single-screw extruder, disclosed in Chinese Patent No. CN212422103U, can be referenced. This mechanism includes a pre-plasticizing seat and a coupling rotatably disposed within the pre-plasticizing seat. One end of the coupling is connected to the driven pulley, and the other end is connected to an external screw. An adjusting plate is installed on the pre-plasticizing seat, and a servo motor is fixed on the adjusting plate. The servo motor is connected to the driving pulley, and the driven pulley and driving pulley are connected via a synchronous belt.

[0003] While existing single-stage synchronous belt reduction electric pre-plasticizing devices reduce production costs compared to traditional hydraulic motor-driven pre-plasticizing devices, they also have the following problems that need to be addressed: Due to limited installation space, the center distance between pulleys and the diameter of the driven pulley will be restricted. When the reduction ratio is large and the center distance between pulleys is small, the wrap angle between the synchronous belt and the driving pulley will be too small, which will significantly reduce the synchronous belt drive capability. Due to the minimum number of meshing teeth of the driving pulley, when the reduction ratio is large, the diameter of the driven pulley will be very large, causing the driven pulley to exceed the installation space and become uninstallable; Due to the upper limit of the reduction ratio, it is impossible to further increase the reduction ratio to reduce the output torque required by the drive motor, thus making it impossible to reduce the power demand of the drive motor and reduce the motor purchase cost. Utility Model Content

[0004] This invention addresses the shortcomings of existing single-stage electro-pre-plasticizing transmission devices, such as insufficient installation space, insufficient transmission capacity, or excessive cost, by providing a two-stage deceleration electro-pre-plasticizing device for injection molding machines that improves transmission performance, has a more compact structure, and reduces costs.

[0005] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method: A two-stage reduction electro-pre-plasticizing device for an injection molding machine includes a mounting base fixedly mounted on the rear plate of the injection unit and a screw rotating on the mounting base. A third driven pulley, coaxially rotating with the screw, is provided on the side of the mounting base away from the screw. A first driven pulley and a second driven pulley, coaxially rotating with the screw, are respectively located on both sides of the mounting base above the third driven pulley. A driving pulley is rotatably mounted on the mounting base on one side of the first driven pulley. The driving pulley is connected to the first driven pulley via a first synchronous belt, and the second driven pulley is connected to the third driven pulley via a second synchronous belt. A drive motor for driving the driving pulley to rotate is provided on the mounting base. The diameter of the driving pulley is smaller than the diameter of the first driven pulley, and the diameter of the second driven pulley is smaller than the diameter of the third driven pulley.

[0006] The above scheme employs a two-stage reduction structure with an overall inverted "L" shape, resulting in a very compact structure. This structure can improve the shortcomings of excessively large single-stage reduction ratios, which lead to insufficient wrap angle of the synchronous belt on the driving pulley, ensuring the performance of the synchronous belt drive. Furthermore, it can achieve a larger reduction ratio, thereby reducing the design size of the driven pulley and improving the overall compactness of the electro-pre-plasticizing device, reducing the total installation space. The increased reduction ratio further reduces the power requirements of the drive motor, ultimately lowering the motor cost.

[0007] Preferably, the mounting base is provided with a first tensioning structure for tensioning the first synchronous belt and a second tensioning structure for tensioning the second synchronous belt.

[0008] Preferably, the driving pulley and the drive motor are mounted on the movable plate, and the first tensioning structure drives the movable plate to move horizontally or be limited relative to the mounting seat; the first driven pulley and the second driven pulley are mounted on the movable seat, and the second tensioning structure drives the movable seat to move vertically or be limited relative to the mounting seat.

[0009] Preferably, the first tensioning structure includes a first locking bolt, a limiting stop for guiding the movable plate integrally folded on the mounting base, a first horizontally extending waist-shaped groove provided on the limiting stop, a first threaded hole provided on the movable plate, and the first locking bolt passes through the first waist-shaped groove and is screwed into the first threaded hole.

[0010] Preferably, a drive structure for moving the movable plate relative to the mounting base is provided between the mounting base and the movable plate. The drive structure includes an adjusting bolt and an adjusting nut. The adjusting bolt passes horizontally through a first protrusion on the mounting base and is screwed to the end of the movable plate. The adjusting nut is screwed onto the adjusting bolt and is located between the mounting base and the bolt head.

[0011] Using the above method, tension adjustment is more labor-saving and precise. During adjustment, first loosen the adjusting nut, then rotate the adjusting bolt to drive the movable plate closer to or further away from the first protrusion. After adjustment, tighten the adjusting nut until it is pressed against the first protrusion to form a locking force, preventing the movable plate from retracting due to transmission vibration, maintaining a stable tension state, and avoiding the impact of synchronous belt tension fluctuations on the transmission effect.

[0012] Preferably, the second tensioning structure includes a second locking bolt, the movable seat includes a lifting plate, the lifting plate is provided with at least two vertically extending second waist-shaped grooves, and the mounting seat is provided with a second threaded hole corresponding to the second waist-shaped grooves. The second locking bolt passes through the second waist-shaped grooves and is screwed into the second threaded hole.

[0013] Using the above scheme, the lifting plate can move stably in the vertical direction through the second waist-shaped groove, ensuring that the axes of the first driven pulley and the second driven pulley are always parallel to the corresponding pulleys when they are vertically raised and lowered, avoiding uneven force on the synchronous belt due to offset; the second locking bolt can quickly lock the position of the lifting plate to ensure the stability of the tension of the second synchronous belt.

[0014] Preferably, a fall-prevention structure is provided between the lifting plate and the mounting base to prevent the lifting plate from falling. The fall-prevention structure includes a pressing bolt, and a second protrusion is vertically protruding on the lifting plate. The pressing bolt is screwed onto the second protrusion and its bottom abuts against the upper end of the mounting base.

[0015] By adopting the above scheme, the pressure bolt and the second locking bolt form a "double fixation", which further restricts the vertical displacement of the lifting plate, reduces the impact of transmission vibration on the position of the lifting plate, ensures the stability of the center distance between the second driven pulley and the third driven pulley, and maintains the reliability of the second synchronous belt drive.

[0016] This utility model, by adopting the above technical solutions, has significant technical effects: It employs a two-stage reduction structure with an overall inverted "L" shape, resulting in a very compact structure. It includes a first tensioning structure and a second tensioning structure. This structure improves upon the deficiency of a small wrap angle of the synchronous belt on the driving pulley caused by an excessively large single-stage reduction ratio, ensuring the performance of the synchronous belt drive. It achieves a larger reduction ratio, reducing the design size of the driven pulley and thus improving the overall compactness of the electro-pre-plasticizing device, reducing the total installation space. The increased reduction ratio further reduces the power requirements of the drive motor, ultimately lowering the motor cost. Attached Figure Description

[0017] Figure 1 This embodiment describes the isometric view of a two-stage reduction electro-pre-plasticizing device for an injection molding machine. Figure 1 ; Figure 2 This embodiment describes the isometric view of a two-stage reduction electro-pre-plasticizing device for an injection molding machine. Figure 2 .

[0018] The parts referred to by the numbers in the above attached figures are as follows: 1. Mounting base; 101. Slot; 102. Limiting stop; 2. Drive motor; 3. Movable plate; 4. First driven pulley; 5. First synchronous belt; 6. Lifting plate; 7. Adjusting bolt; 8. Adjusting nut; 9. First waist-shaped groove; 10. First locking bolt; 11. Third driven pulley; 12. Second driven pulley; 13. Second synchronous belt; 14. Drive pulley; 15. Locking nut; 16. First protrusion; 17. Second locking bolt; 18. Second waist-shaped groove; 19. Pressing bolt; 20. Second protrusion. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] A two-stage reduction electro-pre-plasticizing device for an injection molding machine includes a mounting base 1 fixedly mounted on the rear plate of the injection unit and a screw rotatably mounted on the mounting base 1 (the screw is not shown). A third driven pulley 11, coaxial with the screw, is rotatably connected to the side of the mounting base 1 away from the screw. The screw and the third driven pulley 11 are coaxially connected via a coupling. On both sides of the mounting base 1, above the third driven pulley 11, are respectively rotatably mounted via couplings, with a first driven pulley 4 on the same side as the screw and a second driven pulley 4 on the same side as the third driven pulley 11. Two driven pulleys 12 are mounted on the mounting base 1, with a driving pulley 14 rotatably disposed on one side of the first driven pulley 4. The driving pulley 14 is connected to the first driven pulley 4 via a first synchronous belt 5. The second driven pulley 12 is connected to the third driven pulley 11 via a second synchronous belt 13. The rotation of the driving pulley 14 is controlled by a drive motor 2, which is a servo motor. The diameter of the driving pulley 14 is less than the diameter of the first driven pulley 4, and the diameter of the second driven pulley 12 is less than the diameter of the third driven pulley 11.

[0021] To ensure that the first synchronous belt 5 and the second synchronous belt 13 are always taut, a first tensioning structure for tensioning the first synchronous belt 5 and a second tensioning structure for tensioning the second synchronous belt 13 are provided on the mounting base 1. The specific structure is as follows: the drive pulley 14 and the drive motor 2 are mounted on the movable plate 3. The mounting base 1 has a slot 101 through which the drive motor 2 can pass and move horizontally. On the side of the mounting base 1 near the screw, the upper and lower ends of the slot 101 bulge forward and fold relative to each other to form two limiting stops 102 for limiting the drive motor 2. The movable plate 3... Fixed to the output end of the drive motor 2 and sliding horizontally within the movable space formed by the limiting stop 102 and the mounting base 1, the movable plate 3 is driven by the first tensioning structure to move horizontally or be limited relative to the mounting base 1; the first driven pulley 4 and the second driven pulley 12 are assembled on the movable base, which includes two vertically parallel and spaced lifting plates 6, which are connected as one unit by a connecting plate. The first driven pulley 4 and the second driven pulley 12 are respectively rotatably arranged on the opposite side of the two lifting plates 6, and the lifting plates 6 are driven by the second tensioning structure to move vertically synchronously or be limited relative to the mounting base 1.

[0022] The first tensioning structure includes four first locking bolts 10. Two first waist-shaped grooves 9 extend horizontally on the upper and lower limiting stops (102). Four first threaded holes are correspondingly provided on the movable plate 3. The first locking bolts 10 pass through the first waist-shaped grooves 9 in sequence and are screwed into the first threaded holes.

[0023] A drive structure for moving the movable plate 3 relative to the mounting base 1 is provided between the mounting base 1 and the movable plate 3. The drive structure includes an adjusting bolt 7 and an adjusting nut (8). The adjusting bolt 7 passes horizontally through a first protrusion 16 protruding from the mounting base 1 and is screwed to the end of the movable plate 3. The adjusting nut 8 is screwed onto the adjusting bolt 7 and is located between the mounting base 1 and the bolt head.

[0024] The second tensioning structure includes seven second locking bolts 17. The rear lifting plate 6 is provided with four rectangular and vertically extending second waist-shaped grooves 18, and the front lifting plate is provided with three triangular and vertically extending second waist-shaped grooves 18. Three corresponding second threaded holes are provided on the front side of the mounting base 1, and four corresponding second threaded holes are provided on the rear side of the mounting base. The second locking bolts 17 pass through the second waist-shaped grooves 18 in sequence and are screwed into the second threaded holes.

[0025] A fall prevention structure is provided between the lifting plate 6 and the mounting base 1 to prevent the lifting plate 6 from falling. The fall prevention structure includes a pressing bolt 19. A second protrusion 20 is vertically protruding on the lifting plate 6. The pressing bolt 19 is screwed onto the second protrusion 20 and its bottom abuts against the upper end of the mounting base 1. A locking nut 15 is also screwed onto the pressing nut 19 between its nut head and the second protrusion 20. After adjustment, it abuts against the second protrusion 20.

[0026] This embodiment adopts a two-stage reduction structure with an overall inverted "L" shape, resulting in a very compact structure. It includes a first tensioning structure and a second tensioning structure. This structure can improve the shortcomings of the synchronous belt wrap angle on the driving pulley 14 caused by an excessively large single-stage reduction ratio, thus ensuring the performance of the synchronous belt drive. It can achieve a larger reduction ratio, reduce the design size of the driven pulley, thereby improving the overall compactness of the electro-pre-plasticizing device and reducing the total installation space. The increased reduction ratio can reduce the power demand of the drive motor 2, ultimately reducing the cost of the motor.

[0027] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A two-stage reduction electro-pre-plasticizing device for an injection molding machine, comprising a mounting base (1) fixedly mounted on the rear plate of the injection unit and a screw rotating on the mounting base (1), characterized in that: A third driven pulley (11) is provided on the side of the mounting base (1) away from the screw, and rotates coaxially with the screw. On both sides of the mounting base (1), a first driven pulley (4) and a second driven pulley (12) are respectively rotated coaxially above the third driven pulley (11). A driving pulley (14) is rotatably provided on the mounting base (1) on the side of the first driven pulley (4). The driving pulley (14) is connected to the first driven pulley (4) through a first synchronous belt (5). The second driven pulley (12) is connected to the third driven pulley (11) through a second synchronous belt (13). A drive motor (2) is provided on the mounting base (1) to drive the driving pulley (14) to rotate. The diameter of the driving pulley (14) is less than the diameter of the first driven pulley (4); and the diameter of the second driven pulley (12) is less than the diameter of the third driven pulley (11).

2. The two-stage reduction electro-pre-plasticizing device for an injection molding machine according to claim 1, characterized in that: The mounting base (1) is provided with a first tensioning structure for tensioning the first synchronous belt (5) and a second tensioning structure for tensioning the second synchronous belt (13).

3. The two-stage reduction electro-pre-plasticizing device for an injection molding machine according to claim 2, characterized in that: The driving pulley (14) and the drive motor (2) are mounted on the movable plate (3). The first tensioning structure drives the movable plate (3) to move horizontally or be limited relative to the mounting base (1). The first driven pulley (4) and the second driven pulley (12) are mounted on the movable base. The second tensioning structure drives the movable base to move vertically or be limited relative to the mounting base (1).

4. The two-stage reduction electro-pre-plasticizing device for an injection molding machine according to claim 3, characterized in that: The first tensioning structure includes a first locking bolt (10), a limiting stop (102) for guiding the movable plate (3) is integrally folded on the mounting base (1), a first waist-shaped groove (9) extending horizontally is provided on the limiting stop (102), a first threaded hole is provided on the movable plate (3), and the first locking bolt (10) passes through the first waist-shaped groove (9) and is screwed into the first threaded hole.

5. The two-stage reduction electro-pre-plasticizing device for an injection molding machine according to claim 4, characterized in that: A drive structure for moving the movable plate (3) relative to the mounting base (1) is provided between the mounting base (1) and the movable plate (3). The drive structure includes an adjusting bolt (7) and an adjusting nut (8). The adjusting bolt (7) passes horizontally through a first protrusion (16) on the mounting base (1) and is screwed to the end of the movable plate (3). The adjusting nut (8) is screwed onto the adjusting bolt (7) and is located between the mounting base (1) and the bolt head.

6. The two-stage reduction electro-pre-plasticizing device for an injection molding machine according to claim 3, characterized in that: The second tensioning structure includes a second locking bolt (17), and the movable seat includes a lifting plate (6). The lifting plate (6) is provided with at least two vertically extending second waist-shaped grooves (18). The mounting seat (1) is provided with a second threaded hole corresponding to the second waist-shaped groove. The second locking bolt (17) passes through the second waist-shaped groove (18) and is screwed into the second threaded hole.

7. The two-stage reduction electro-pre-plasticizing device for an injection molding machine according to claim 6, characterized in that: A fall protection structure is provided between the lifting plate (6) and the mounting base (1) to prevent the lifting plate (6) from falling. The fall protection structure includes a pressing bolt (19). A second protrusion (20) is vertically protruding on the lifting plate (6). The pressing bolt (19) is screwed onto the second protrusion (20) and its bottom abuts against the upper end of the mounting base (1).

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