Injection-molding process pressure fluctuation suppression device

Abstract

This application relates to the field of injection molding technology and discloses a pressure fluctuation suppression device for the injection molding process, including a fixed mold base and a moving mold base disposed on one side thereon. A thrust plate is fixedly installed on the side of the moving mold base away from the fixed mold base, and a positioning plate is fixedly installed on one side of the thrust plate. The moving mold base, the thrust plate, and the positioning plate have the same through hole in their inner walls. A hydraulic rod is installed on the inner wall of the positioning plate located inside the through hole. The hydraulic rod drives the piston shell, and a pressure sensor monitors the mold cavity pressure in real time. When the injection pressure or the extension and retraction pressure of the hydraulic cylinder is too large, the pressure sensor feeds back the signal to the control system. The hydraulic rod can precisely adjust the position of the piston shell to buffer the pressure impact. At the same time, the spring provides flexible compensation to avoid sudden changes in rigid pressure. This design effectively suppresses pressure fluctuations during the injection molding process, prevents the injection liquid from overflowing from the mold base joint due to excessive pressure, thereby reducing the generation of mold burrs and significantly improving product quality and production stability.

Description

Technical Field

[0001] This application relates to the field of injection molding technology, specifically to a pressure fluctuation suppression device for the injection molding process. Background Technology

[0002] During injection molding, pressure fluctuations directly affect the quality, dimensional accuracy, and production efficiency of plastic products. To address this issue, pressure fluctuation suppression devices for injection molding have been developed. These devices use precision control technology to stabilize pressure and ensure the reliability of injection molding.

[0003] Currently, the moving mold holder is driven by a hydraulic cylinder, and the injection molding machine also uses a hydraulic cylinder for telescopic movement, thereby moving the injection head of the injection molding machine to the injection hole end of the fixed mold holder, so that the injection liquid can enter the mold cavity between the fixed mold holder and the moving mold holder. However, if the pressure of the injection liquid entering the mold cavity is too high, or if the extension and retraction pressure of the hydraulic cylinder is too high, the injection liquid may overflow from the joint between the two mold holders, resulting in burrs on the mold. Utility Model Content

[0004] The purpose of this application is to provide a pressure fluctuation suppression device for the injection molding process, which solves the problem mentioned in the background art where the moving mold seat is driven by a hydraulic cylinder and the injection molding machine is also moved by a hydraulic cylinder to move the injection head of the injection molding machine to the injection hole end of the fixed mold seat, so that the injection liquid can enter the mold cavity between the fixed mold seat and the moving mold seat. However, if the pressure of the injection liquid entering the mold cavity is too high, or if the extension and retraction pressure of the hydraulic cylinder is too high, the injection liquid may overflow from the joint between the two mold seats, resulting in burrs on the mold.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This application provides a pressure fluctuation suppression device for injection molding, including a fixed mold base and a moving mold base disposed on one side thereon. A thrust plate is fixedly installed on the side of the moving mold base away from the fixed mold base, and a positioning plate is fixedly installed on one side of the thrust plate. The moving mold base, the thrust plate, and the positioning plate have the same through hole in their inner walls. A hydraulic rod is installed on the inner wall of the positioning plate located inside the through hole. An installation block is fixedly installed on the telescopic end of the hydraulic rod. A piston shell is fixedly installed on the side of the installation block away from the hydraulic rod. A pressure sensor is installed in the inner wall of the piston shell. A spring is sleeved on the outer wall of the hydraulic rod, and the two ends of the spring abut against the positioning plate and the installation block, respectively.

[0007] By adopting the above technical solution, the piston shell is driven by a hydraulic rod, and the pressure sensor monitors the mold cavity pressure in real time. When the injection pressure or the extension and retraction pressure of the hydraulic cylinder is too high, the pressure sensor feeds back the signal to the control system. The hydraulic rod can precisely adjust the position of the piston shell to buffer the pressure impact. At the same time, the spring provides flexible compensation to avoid sudden changes in rigid pressure. This design effectively suppresses pressure fluctuations during the injection process and prevents the injection liquid from overflowing from the mold base joint due to excessive pressure, thereby reducing the generation of mold burrs and significantly improving product quality and production stability.

[0008] Optionally, the outer wall of the fixed mold base is provided with an abutment groove, and the inner wall of the fixed mold base located on one side of the abutment groove is provided with an injection hole, which communicates with the abutment groove.

[0009] By adopting the above technical solution, the setting of the abutment groove can play a role in storing the injection head of the external injection molding machine, thereby facilitating the injection liquid to enter the mold cavity in the fixed mold base from the injection hole.

[0010] Optionally, four sets of guide rods are slidably passed through the inner walls of the fixed mold base and the moving mold base, respectively.

[0011] By adopting the above technical solution, four sets of guide rods can guide the movement of the moving mold base, which can then extend and retract with the assistance of an external hydraulic cylinder.

[0012] Optionally, the outer walls of the four sets of guide rods located on one side of the fixed mold base are respectively welded with fixing blocks, and the fixing blocks are fixedly installed with the fixed mold base.

[0013] By adopting the above technical solution, the fixing block can play a role in fixing the connection between the fixed mold base and the guide rod.

[0014] Optionally, three sets of sealing rings are tensioned and fitted in the outer wall of the piston housing, and the three sets of sealing rings abut against the inner wall of the moving mold seat.

[0015] By adopting the above technical solution, the sealing ring can be used to seal the piston shell and the inner wall of the moving mold seat.

[0016] Optionally, the maximum extension range of the piston housing corresponds to the outer wall of the protrusion of the moving mold base.

[0017] By adopting the above technical solution, the maximum extension range of the piston shell corresponds to the outer wall of the protruding end of the moving mold base, thus preventing the piston shell from extending or retracting beyond its limit.

[0018] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0019] The technical solution of this application uses a hydraulic rod to drive the piston shell, and a pressure sensor monitors the mold cavity pressure in real time. When the injection pressure or the extension and retraction pressure of the hydraulic cylinder is too high, the pressure sensor feeds back the signal to the control system. The hydraulic rod can precisely adjust the position of the piston shell to buffer the pressure impact. At the same time, the spring provides flexible compensation to avoid sudden changes in rigid pressure. This design effectively suppresses pressure fluctuations during the injection process and prevents the injection liquid from overflowing from the mold base joint due to excessive pressure, thereby reducing the generation of mold burrs and significantly improving product quality and production stability. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 This is an axial view schematic diagram of the pressure fluctuation suppression device in the injection molding process of this application;

[0022] Figure 2 This is a first frontal cross-sectional view of the pressure fluctuation suppression device for the injection molding process in this application;

[0023] Figure 3 This is a second front cross-sectional view of the pressure fluctuation suppression device for the injection molding process in this application;

[0024] Figure 4 The pressure fluctuation suppression device for the injection molding process of this application Figure 3 Enlarged view of point A in the middle.

[0025] In the diagram: 1. Fixed mold base; 2. Moving mold base; 3. Thrust plate; 4. Positioning plate; 5. Hydraulic rod; 6. Spring; 7. Through hole; 8. Mounting block; 9. Piston housing; 10. Pressure sensor; 11. Sealing ring; 12. Injection hole; 13. Abutment groove; 14. Guide rod; 15. Fixing block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-4This application provides a technical solution: a pressure fluctuation suppression device for injection molding process, including a fixed mold base 1 and a moving mold base 2 disposed on one side thereon. A thrust plate 3 is fixedly installed on the side of the moving mold base 2 away from the fixed mold base 1, and a positioning plate 4 is fixedly installed on one side of the thrust plate 3. The moving mold base 2, the thrust plate 3 and the positioning plate 4 are provided with the same through hole 7. A hydraulic rod 5 is installed on the inner wall of the positioning plate 4 located inside the through hole 7. An installation block 8 is fixedly installed on the telescopic end of the hydraulic rod 5. A piston shell 9 is fixedly installed on the side of the installation block 8 away from the hydraulic rod 5. A pressure sensor 10 is installed in the inner wall of the piston shell 9. A spring 6 is sleeved on the outer wall of the hydraulic rod 5. The two ends of the spring 6 abut against the positioning plate 4 and the installation block 8 respectively.

[0028] In the technical solution of this application, the piston housing 9 is driven by the hydraulic rod 5, and the pressure sensor 10 monitors the mold cavity pressure in real time. When the injection pressure or the hydraulic cylinder extension pressure is too high, the pressure sensor 10 feeds the signal back to the control system. The hydraulic rod 5 can precisely adjust the position of the piston housing 9 to buffer the pressure impact. At the same time, the spring 6 provides flexible compensation to avoid sudden changes in rigid pressure. This design effectively suppresses pressure fluctuations during the injection process and prevents the injection liquid from overflowing from the mold base joint due to excessive pressure, thereby reducing the generation of mold burrs and significantly improving product quality and production stability. The pressure sensor 10 is model GEFRAN-KS-NEE-B25D-MV.

[0029] In the technical solution of this application, such as Figure 3 and Figure 4 As shown, three sets of sealing rings 11 are tensioned and fitted in the outer wall of the piston shell 9, and the three sets of sealing rings 11 abut against the inner wall of the moving mold base 2. The sealing rings 11 can seal the piston shell 9 and the inner wall of the moving mold base 2. The maximum extension range of the piston shell 9 corresponds to the outer wall of the convex end of the moving mold base 2. By the maximum extension range of the piston shell 9 corresponding to the outer wall of the convex end of the moving mold base 2, the piston shell 9 is prevented from extending or retracting beyond the limit.

[0030] In the technical solution of this application, such as Figure 1 and Figure 3 As shown, the outer wall of the fixed mold base 1 is provided with an abutment groove 13, and the inner wall of the fixed mold base 1 located on one side of the abutment groove 13 is provided with an injection hole 12. The injection hole 12 is connected to the abutment groove 13. The abutment groove 13 can be used to store the injection head of the external injection molding machine, thereby facilitating the injection liquid to enter the mold cavity in the fixed mold base 1 from the injection hole 12.

[0031] In the technical solution of this application, such as Figures 1-3As shown, four sets of guide rods 14 are slidably provided on the inner walls of the fixed mold base 1 and the moving mold base 2, respectively. The four sets of guide rods 14 can guide the moving mold base 2 to move. The moving mold base 2 can move telescopically with the help of an external hydraulic cylinder. Fixing blocks 15 are welded to the outer walls of the four sets of guide rods 14 located on one side of the fixed mold base 1. The fixing blocks 15 are fixedly installed with the fixed mold base 1. The fixing blocks 15 can fix the connection between the fixed mold base 1 and the guide rods 14.

[0032] In use, after the fixed mold base 1 and the moving mold base 2 are closed, the injection head of the external injection molding machine is inserted into the abutment groove 13 of the fixed mold base 1. The injection molten metal is injected into the mold cavity through the injection hole 12. At this time, the pressure sensor 10 on the inner wall of the piston housing 9 monitors the mold cavity pressure in real time. When the injection pressure or the expansion and contraction pressure generated when the external hydraulic cylinder drives the moving mold base 2 to move exceeds the preset threshold, the pressure sensor 10 immediately transmits an electrical signal to the control system. The control system drives the hydraulic rod 5 to extend and retract according to the pressure deviation value. The hydraulic rod 5 drives the piston housing 9 to move along the inner wall of the moving mold base 2 through the mounting block 8. By changing the contact area between the piston housing 9 and the mold cavity, the effective pressure-bearing volume is adjusted, thereby buffering the pressure impact. At the same time, the spring 6 sleeved on the outer wall of the hydraulic rod 5 provides a reverse elastic force during the movement of the piston housing 9. A flexible compensation mechanism is formed to avoid pressure abrupt changes caused by rigid displacement. Four sets of guide rods 14 are rigidly connected to the fixed mold base 1 through the fixed block 15, providing precise guidance for the moving mold base 2 and ensuring that the extension and retraction direction of the piston shell 9 is consistent with the mold cavity axis. The three sets of sealing rings 11 on the outer wall of the piston shell 9 are tightly abutted against the inner wall of the moving mold base 2 to prevent leakage of injection liquid. The maximum extension and retraction range of the piston shell 9 is limited and protected by the outer wall of the protruding end of the moving mold base 2 to prevent over-stroke damage. This device controls the pressure fluctuation range of the injection molding process within a certain range through closed-loop control of pressure feedback, hydraulic adjustment and elastic compensation, effectively avoiding the leakage of injection liquid from the mold base joint due to excessive pressure, reducing the generation of mold burrs, reducing the weight fluctuation rate of the product to within a certain range, and significantly improving production stability.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A pressure fluctuation suppression device for injection molding process, characterized in that: The device includes a fixed mold base (1) and a movable mold base (2) disposed on one side thereon. A thrust plate (3) is fixedly installed on the side of the movable mold base (2) away from the fixed mold base (1). A positioning plate (4) is fixedly installed on one side of the thrust plate (3). The same through hole (7) is opened in the inner wall of the movable mold base (2), the thrust plate (3) and the positioning plate (4). A hydraulic rod (5) is installed on the inner wall of the positioning plate (4) located inside the through hole (7). An installation block (8) is fixedly installed on the telescopic end of the hydraulic rod (5). A piston shell (9) is fixedly installed on the side of the installation block (8) away from the hydraulic rod (5). A pressure sensor (10) is installed in the inner wall of the piston shell (9). A spring (6) is sleeved on the outer wall of the hydraulic rod (5). The two ends of the spring (6) abut against the positioning plate (4) and the installation block (8) respectively.

2. The pressure fluctuation suppression device for injection molding process according to claim 1, characterized in that, The outer wall of the fixed mold base (1) is provided with an abutment groove (13), and the inner wall of the fixed mold base (1) located on one side of the abutment groove (13) is provided with an injection hole (12), which is connected to the abutment groove (13).

3. The pressure fluctuation suppression device for injection molding process according to claim 1, characterized in that, The inner walls of the fixed mold base (1) and the moving mold base (2) are respectively provided with four sets of guide rods (14).

4. The pressure fluctuation suppression device for injection molding process according to claim 3, characterized in that, The outer walls of the four sets of guide rods (14) located on one side of the fixed mold base (1) are respectively welded with fixing blocks (15), and the fixing blocks (15) are fixedly installed with the fixed mold base (1).

5. The pressure fluctuation suppression device for injection molding process according to claim 1, characterized in that, The piston housing (9) is provided with three sets of sealing rings (11) on its outer wall, and the three sets of sealing rings (11) abut against the inner wall of the moving mold base (2).

6. The pressure fluctuation suppression device for injection molding process according to claim 5, characterized in that, The maximum extension range of the piston shell (9) corresponds to the outer wall of the protrusion of the moving mold base (2).

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