Die assembly driving mechanism of injection molding machine

Abstract

The utility model relates to the technical field of injection molding machines, in particular to a mold closing driving mechanism of an injection molding machine, which comprises a base, a ball screw is rotatably connected in the base, a ball nut is sleeved on the outer surface of the ball screw in a threaded manner, and a moving block is fixedly connected on the outer surface of the ball nut. Supporting rods are rotationally connected to the top and the bottom of the moving block, first rotating rods are rotationally connected to the top and the bottom of the base, and the ends, away from the moving block, of the supporting rods are rotationally connected to the first rotating rods. When the first rotating rod is pushed by the moving block, the first rotating rod and the second rotating rod are stably unfolded from a contraction state to apply thrust to the first mounting plate, and the movable mold is driven to approach the fixed mold after the thrust is applied, so that the accurate mold closing of the movable mold and the fixed mold is realized, the uniform stress of the mold in the mold closing process is ensured, and the production efficiency is improved. And the product quality problem or the die damage risk caused by uneven stress is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a mold clamping drive mechanism for an injection molding machine. Background Art

[0002] An injection molding machine is a mechanical device that injects molten plastic material into a mold and removes the product after cooling and solidification. Its basic principle is to use a heater to heat and melt plastic particles to make them into a low-viscosity molten material, and then inject the molten plastic into the cavity of the mold through an injection device. During the injection molding process, the injection molding machine provides high-pressure and high-speed injection force to quickly fill the molten plastic into every detail of the mold, and after cooling and solidification, it forms a product with the desired shape.

[0003] The mold closing of the injection molding machine is a key step in the injection molding process, which refers to the merging of the two parts of the mold into one for injection operation. At present, the mold closing device of the injection molding machine is mainly composed of a template, a positioning device, a mold closing mechanism, a hydraulic cylinder, and a hydraulic drive system. Among them, the hydraulic cylinder plays a key role in the mold closing process. When the hydraulic system of the injection molding machine is started, the hydraulic pump transmits the pressure to the hydraulic cylinder, so that the mold closing plate starts to move and performs the mold closing action. Through the push of the hydraulic cylinder, the mold closing plate can fit the mold tightly to form a complete space for subsequent plastic injection and molding processes. The viscosity of the hydraulic oil of the hydraulic cylinder will change with the change of temperature. The high temperature during mold closing will cause the viscosity of the hydraulic oil of the hydraulic cylinder to decrease, which will cause the thrust of the hydraulic cylinder to be insufficient. When the thrust of the hydraulic cylinder is not enough to meet the pressure required for mold closing, the various parts of the mold cannot be evenly stressed, which will affect the quality of the product. Therefore, a mold closing drive mechanism for an injection molding machine is designed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a mold closing drive mechanism for an injection molding machine, which solves the problem that the viscosity of the hydraulic oil in the hydraulic cylinder changes with the temperature. The high temperature during mold closing will cause the viscosity of the hydraulic oil in the hydraulic cylinder to decrease, resulting in insufficient thrust of the hydraulic cylinder. When the thrust of the hydraulic cylinder is insufficient to meet the pressure required for mold closing, various parts of the mold cannot be evenly stressed, which will affect product quality.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a mold clamping drive mechanism for an injection molding machine, comprising a base, a ball screw is rotatably connected inside the base, a ball nut is threadedly sleeved on the outer surface of the ball screw, a moving block is fixedly connected to the outer surface of the ball nut, and a support rod is rotatably connected to the top and bottom of the moving block;

[0006] The top and bottom of the base are rotatably connected to a first rotating rod, one end of the support rod away from the moving block is rotatably connected to the first rotating rod, one end of the first rotating rod away from the base is rotatably connected to a second rotating rod, one end of the second rotating rod is rotatably connected to a first mounting plate, and one side of the first mounting plate is fixedly connected to a movable mold.

[0007] Preferably, a driving motor is fixedly connected to the outer side of the base, a driving wheel is fixedly connected to the output end of the driving motor, one end of the ball screw passes through and extends to the outer side of the base, one end of the ball screw is fixedly sleeved with a driven wheel, and the driven wheel is connected to the driving wheel through a transmission belt.

[0008] Preferably, fixing rods are fixedly inserted at the four corners of the base, and penetrating sliding holes are opened at the four corners of the first mounting plate, and the outer surface of the fixing rod is slidably connected to the inner wall of the sliding hole.

[0009] Preferably, one end of the fixing rod passes through and extends to the outside of the base, a small gear is rotatably sleeved on one end of the fixing rod, and a large gear is fixedly sleeved on one end of the outer surface of the ball screw, and the teeth of the large gear mesh with the teeth of the small gear.

[0010] Preferably, a fixing sleeve at the other end of the ball screw is provided with a limit block, and the outer diameter of the limit block is larger than the outer diameter of the ball nut.

[0011] Preferably, a second mounting plate is fixedly connected to the fixing rod, through holes are formed at four corners of the second mounting plate, and the fixing rod is fixedly inserted in the through holes.

[0012] Preferably, a fixed mold is fixedly connected to the inner side of the second mounting plate, and the fixed mold is arranged opposite to the movable mold.

[0013] Preferably, a receiving groove is provided in the middle of the inner side of the base, and the moving block is slidably connected inside the receiving groove.

[0014] Preferably, the cross-section of the accommodating groove is an isosceles trapezoid.

[0015] By means of the above technical solution, the utility model provides a mold clamping drive mechanism for an injection molding machine, which has at least the following beneficial effects:

[0016] 1. The mold closing drive mechanism of the injection molding machine, the rotation of the ball screw will synchronously drive the ball nut to rotate, and the cooperation of the ball nut and the ball screw will convert the rotational motion into linear motion, so that the moving block can move forward along the preset track, and exert a driving force on the first rotating rod. Due to the rotational connection between the first rotating rod and the second rotating rod, when the first rotating rod is pushed by the moving block, the first rotating rod and the second rotating rod are smoothly expanded from the contracted state, and a thrust is exerted on the first mounting plate. After receiving the thrust, the movable mold will be driven to approach the fixed mold, so as to realize the precise mold closing of the movable mold and the fixed mold, and ensure that the mold is evenly stressed during the mold closing process, avoiding product quality problems or mold damage risks caused by uneven stress.

[0017] 2. The mold closing drive mechanism of the injection molding machine, the driving motor will drive the driving wheel to start rotating. The driving wheel is connected to the driven wheel through a transmission belt, so the driven wheel will rotate following the rotation of the driving wheel. Since the driven wheel is fixedly mounted on the ball screw, the rotation of the driven wheel will directly drive the ball screw to rotate, thereby facilitating the precise mold closing operation of the movable mold and the fixed mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0019] Figure 1 This is a left view of the structure of the utility model;

[0020] Figure 2 This is the right side view of the structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the local structure of the utility model;

[0022] Figure 4 It is a cross-sectional view of the base structure of the utility model.

[0023] In the figure: 1. base; 2. ball screw; 3. moving block; 4. ball nut; 5. support rod; 6. first rotating rod; 7. second rotating rod; 8. first mounting plate; 9. movable mold; 10. driving motor; 11. driving wheel; 12. driven wheel; 13. transmission belt; 14. large gear; 15. fixed rod; 16. small gear; 17. second mounting plate; 18. fixed mold; 19. receiving groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-4 , a mold clamping drive mechanism for an injection molding machine, comprising a base 1, a ball screw 2 is rotatably connected inside the base 1, a ball nut 4 is threadedly sleeved on the outer surface of the ball screw 2, a moving block 3 is fixedly connected to the outer surface of the ball nut 4, and a support rod 5 is rotatably connected to the top and bottom of the moving block 3;

[0026] The top and bottom of the base 1 are rotatably connected with a first rotating rod 6, one end of the support rod 5 away from the moving block 3 is rotatably connected to the first rotating rod 6, one end of the first rotating rod 6 away from the base 1 is rotatably connected with a second rotating rod 7, one end of the second rotating rod 7 is rotatably connected with a first mounting plate 8, and one side of the first mounting plate 8 is fixedly connected with a movable mold 9. The rotation of the ball screw 2 will synchronously drive the ball nut 4 to rotate, and the cooperation of the ball nut 4 and the ball screw 2 will convert the rotational motion into a linear motion, so that the moving block 3 can move forward along the preset track, and apply a driving force to the first rotating rod 6. Due to the rotational connection between the first rotating rod 6 and the second rotating rod 7, when the first rotating rod 6 is pushed by the moving block 3, the first rotating rod 6 and the second rotating rod 7 are smoothly expanded from the contracted state, and a thrust is applied to the first mounting plate 8. After receiving the thrust, the movable mold 9 is driven to approach the fixed mold 18, so as to achieve accurate mold closing of the movable mold 9 and the fixed mold 18, and ensure that the mold is evenly stressed during the mold closing process, avoiding product quality problems or mold damage risks caused by uneven stress.

[0027] The outside of the base 1 is fixedly connected with a driving motor 10, and the output end of the driving motor 10 is fixedly connected with a driving wheel 11. One end of the ball screw 2 penetrates and extends to the outside of the base 1. One end of the ball screw 2 is fixedly sleeved with a driven wheel 12, and the driven wheel 12 is connected to the driving wheel 11 through a transmission belt 13. The operation of the driving motor 10 will drive the driving wheel 11 to start rotating. The driving wheel 11 is connected to the driven wheel 12 through the transmission belt 13, so the driven wheel 12 will rotate following the rotation of the driving wheel 11. Since the driven wheel 12 is fixedly sleeved on the ball screw 2, the rotation of the driven wheel 12 will directly drive the ball screw 2 to rotate, thereby facilitating the precise mold closing operation of the movable mold 9 and the fixed mold 18.

[0028] The four corners of the base 1 are fixedly connected with fixing rods 15, and the four corners of the first mounting plate 8 are provided with penetrating sliding holes, and the outer surface of the fixing rods 15 is slidably connected with the inner wall of the sliding hole. This allows the first mounting plate 8 to maintain a stable track during movement, avoid deviation or shaking, and ensure the accuracy of mold clamping.

[0029] One end of the fixing rod 15 penetrates and extends to the outside of the base 1, and a small gear 16 is rotatably sleeved on one end of the fixing rod 15. A large gear 14 is fixedly sleeved on one end of the outer surface of the ball screw 2, and the teeth of the large gear 14 mesh with the teeth of the small gear 16. The stability of the rotation of the ball screw 2 is ensured.

[0030] The other end of the ball screw 2 is fixed with a stopper, and the outer diameter of the stopper is larger than the outer diameter of the ball nut 4. This can effectively prevent the ball nut 4 from falling off the ball screw 2. When the ball screw 2 rotates and drives the ball nut 4 to move linearly, the stopper will act as a physical barrier to prevent the ball nut 4 from moving forward, thereby improving stability and safety.

[0031] The second mounting plate 17 is fixedly connected to the fixing rod 15. Through holes are provided at the four corners of the second mounting plate 17. The fixing rod 15 is fixedly inserted into the inside of the through holes. A fixed mold 18 is fixedly connected to the inner side of the second mounting plate 17. The fixed mold 18 is arranged opposite to the movable mold 9. The second mounting plate 17 is precisely positioned and fixed by the fixing rod 15, so that the fixed mold 18 and the movable mold 9 can be precisely matched, thereby improving the precision and quality of injection molding.

[0032] A receiving groove 19 is provided in the middle of the inner side of the base 1, and the moving block 3 is slidably connected inside the receiving groove 19. The cross section of the receiving groove 19 is an isosceles trapezoid. The receiving groove 19 has a certain opening width, providing a receiving space for the first rotating rod 6 and the second rotating rod 7 in the retracted state.

[0033] Working principle: The driving motor 10 drives the driving wheel 11 to start rotating. The driving wheel 11 is connected to the driven wheel 12 through the transmission belt 13. Therefore, the driven wheel 12 will rotate following the rotation of the driving wheel 11. Since the driven wheel 12 is fixedly sleeved on the ball screw 2, the rotation of the driven wheel 12 will directly drive the ball screw 2 to rotate.

[0034] The rotation of the ball screw 2 will synchronously drive the ball nut 4 to rotate. The cooperation between the ball nut 4 and the ball screw 2 converts the rotational motion into linear motion, so that the moving block 3 can move forward along the preset track, and exert a driving force on the first rotating rod 6. Due to the rotational connection between the first rotating rod 6 and the second rotating rod 7, when the first rotating rod 6 is pushed by the moving block 3, the first rotating rod 6 and the second rotating rod 7 are smoothly expanded from the contracted state, and a thrust is exerted on the first mounting plate 8. After receiving the thrust, the movable mold 9 is driven to approach the fixed mold 18, thereby realizing the precise clamping of the movable mold 9 and the fixed mold 18, and ensuring that the mold is subjected to uniform force during the clamping process, thereby avoiding product quality problems or mold damage risks caused by uneven force.

[0035] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mold clamping drive mechanism for an injection molding machine, comprising a base (1), characterized in that: A ball screw (2) is rotatably connected inside the base (1); a ball nut (4) is threadedly sleeved on the outer surface of the ball screw (2); a moving block (3) is fixedly connected to the outer surface of the ball nut (4); and support rods (5) are rotatably connected to the top and bottom of the moving block (3); The top and bottom of the base (1) are rotatably connected to a first rotating rod (6); one end of the support rod (5) away from the moving block (3) is rotatably connected to the first rotating rod (6); one end of the first rotating rod (6) away from the base (1) is rotatably connected to a second rotating rod (7); one end of the second rotating rod (7) is rotatably connected to a first mounting plate (8); and one side of the first mounting plate (8) is fixedly connected to a movable mold (9).

2. The mold clamping drive mechanism for an injection molding machine according to claim 1, characterized in that: A driving motor (10) is fixedly connected to the outside of the base (1), and an output end of the driving motor (10) is fixedly connected to a driving wheel (11). One end of the ball screw (2) passes through and extends to the outside of the base (1), and one end of the ball screw (2) is fixedly sleeved with a driven wheel (12). The driven wheel (12) is connected to the driving wheel (11) through a transmission belt (13).

3. The mold clamping drive mechanism for an injection molding machine according to claim 1, characterized in that: The four corners of the base (1) are all fixedly plugged with fixing rods (15), the four corners of the first mounting plate (8) are all provided with penetrating sliding holes, and the outer surface of the fixing rod (15) is slidably connected to the inner wall of the sliding hole.

4. The mold clamping drive mechanism for an injection molding machine according to claim 3, characterized in that: One end of the fixing rod (15) passes through and extends to the outside of the base (1); a small gear (16) is rotatably sleeved on one end of the fixing rod (15); a large gear (14) is fixedly sleeved on one end of the outer surface of the ball screw (2); the teeth of the large gear (14) mesh with the teeth of the small gear (16).

5. The mold clamping drive mechanism for an injection molding machine according to claim 1, characterized in that: The other end of the ball screw (2) is fixedly sleeved with a limit block, and the outer diameter of the limit block is greater than the outer diameter of the ball nut (4).

6. The mold clamping drive mechanism for an injection molding machine according to claim 3, characterized in that: The fixing rod (15) is fixedly connected to a second mounting plate (17), four corners of the second mounting plate (17) are provided with through holes, and the fixing rod (15) is fixedly inserted inside the through holes.

7. The mold clamping drive mechanism for an injection molding machine according to claim 6, characterized in that: A fixed mold (18) is fixedly connected to the inner side of the second mounting plate (17), and the fixed mold (18) is arranged opposite to the movable mold (9).

8. The mold clamping drive mechanism for an injection molding machine according to claim 1, characterized in that: A receiving groove (19) is provided in the middle of the inner side of the base (1), and the moving block (3) is slidably connected inside the receiving groove (19).

9. The mold clamping drive mechanism for an injection molding machine according to claim 8, characterized in that: The cross section of the containing groove (19) is an isosceles trapezoid.

Images