Injection molding machine with injection mold

Abstract

The application discloses an injection mold for an injection molding machine and relates to the technical field of injection molding equipment. The injection mold comprises a rack, a mold cavity is installed on the rack, an injection cylinder is installed on the mold cavity through a support frame, the injection cylinder is communicated with the mold cavity through an injection pipe, an extrusion mechanism for extruding material is arranged on the support frame, limiting protrusions adapted to product notches are arranged on the left and right sides of the mold cavity and are driven to move by second telescopic assemblies, a plugging block is arranged on the front side of the mold cavity and is driven to move by a third telescopic assembly, and a demolding block is arranged on the back side of the mold cavity and is driven to move by a fourth telescopic assembly. The movable limiting protrusions realize accurate molding and convenient demolding of the product notches, the heating assembly and the extrusion mechanism are matched to improve the injection stability, a plurality of telescopic assemblies are used to realize automatic production, and the product qualification rate and the production efficiency are improved, so that the injection mold is suitable for industrialized batch production.

Description

Technical Field

[0001] This application relates to the field of injection molding equipment technology, and in particular to an injection mold for an injection molding machine. Background Technology

[0002] Injection molding, as one of the core technologies in the plastics processing field, is widely used in many industries such as automotive, electronics, and home appliances due to its advantages such as high production efficiency, good molding precision, and the ability to mass-produce complex structural products. Injection molds, used in injection molding machines, are key components in injection molding, and their structural design directly determines the quality of the injection-molded product, production efficiency, and the mold's lifespan.

[0003] In existing technologies, injection molds typically include a mold cavity, an injection mechanism, and a simple mold opening and closing structure. However, in the production of injection-molded products with notched structures, the following problems commonly exist: First, the forming of the notch on the finished product often relies on an integrated protrusion on the inner wall of the mold cavity. After molding, the fit between the finished product and the protrusion is high, making it easy for the finished product to be scratched or deformed during demolding, which seriously affects the product qualification rate. Second, during the injection process, the material conveying and extrusion stability within the injection barrel is insufficient. Uneven extrusion pressure often leads to incomplete material filling, resulting in defects such as missing material and air bubbles in the finished product. Third, the sealing and positioning structure of the mold is poorly designed, often relying on manual auxiliary positioning or fixing structures. This is not only cumbersome and increases labor costs, but also makes it difficult to guarantee positioning accuracy, resulting in poor consistency between different batches of finished products. Fourth, the demolding mechanism is simply designed, often a single ejection structure, which is ineffective for demolding complex-structured products, easily causing damage to the finished product and reducing production efficiency. Utility Model Content

[0004] This utility model addresses the aforementioned problems in the existing technology by providing an injection mold for an injection molding machine.

[0005] The objective of this utility model is mainly achieved through the following solution: An injection mold for an injection molding machine includes a frame. A mold cavity is mounted on the upper surface of the frame. An injection cylinder is mounted on the upper surface of the mold cavity via a support frame. An injection tube is connected to the top of the mold cavity, and the bottom of the injection cylinder is connected to the injection tube. An extrusion mechanism is mounted on the support frame, which can extrude the material in the injection cylinder into the injection tube. Limiting protrusions that correspond to the notches on the injection molded product are provided on both the left and right sides of the mold cavity, and the corresponding limiting protrusions can be moved left and right by two second telescopic components. The front of the mold cavity is open, and a sealing block is provided on the front of the mold cavity, and the sealing block can be moved back and forth by a third telescopic component.

[0006] Preferably, the support frame includes two vertically arranged support rods on the left and right, a first fixing plate is installed between the middle of the two support rods, the injection cylinder is vertically installed on the first fixing plate, and the top of the injection cylinder passes through the upper surface of the first fixing plate and is provided with a funnel-shaped discharge hopper.

[0007] Preferably, a second fixing plate is installed between the tops of the two support rods. The extrusion mechanism includes a first telescopic component and an extrusion rod connected to the telescopic end of the first telescopic component. The first telescopic component is vertically fixedly installed on the second fixing plate. The telescopic end of the first telescopic component passes through the lower surface of the second fixing plate and is fixedly connected to the extrusion rod. The extrusion rod can extend into the interior of the injection molding cylinder.

[0008] Preferably, the outer wall of the injection molding cylinder is provided with multiple sets of heating components along the extended length direction.

[0009] Preferably, the mold cavity has through holes on both the left and right sides that are adapted to the limiting protrusions. The second telescopic component is mounted on the upper surface of the frame through the first mounting base. The telescopic end of the second telescopic component is equipped with an extrusion plate, and the side wall of the extrusion plate is provided with the limiting protrusions.

[0010] Preferably, the third telescopic component is mounted on the upper surface of the frame via the second mounting base, and the telescopic end of the third telescopic component is connected to the sealing block.

[0011] Preferably, the mold cavity has a rear opening, and a stripping module is installed inside the rear of the mold cavity. A fourth telescopic component is installed on the upper surface of the frame via a third mounting base. The telescopic end of the fourth telescopic component is connected to the stripping module, and the fourth telescopic component can drive the stripping module to move back and forth.

[0012] In summary, compared with the prior art, the present invention has the following beneficial technical effects: (1) This utility model provides movable limiting protrusions on the left and right sides of the mold cavity. The shape of the limiting protrusions is perfectly matched with the finished product recess, which can accurately form the finished product recess structure. At the same time, the limiting protrusions are moved by the second telescopic component. After forming, they can be removed from the mold cavity before demolding, which avoids the scratching of the finished product by the protrusion structure in the traditional integrated mold and effectively improves the forming quality and pass rate of the finished product. (2) The multiple heating components set on the outside of the injection cylinder in this utility model can ensure that the raw material is always in a stable molten state and avoid poor conveying caused by the cooling and solidification of the raw material; in conjunction with the first telescopic component in the extrusion mechanism to drive the extrusion rod to stably extrude, the material can be uniformly conveyed to the mold cavity, effectively reducing defects such as material shortage and bubbles in the finished product, and improving the stability of injection molding. (3) This utility model realizes the functions of material extrusion, movement of limiting protrusion, mold cavity sealing and demolding through the first to fourth telescopic components respectively. Each component can be linked and controlled by the PLC control system. No manual intervention is required throughout the process. This not only reduces the intensity of manual labor, but also greatly improves production efficiency and meets the needs of industrialized mass production. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model from another angle.

[0014] Reference numerals: 1-Frame; 2-Mold cavity; 3-Injection cylinder; 4-Injection tube; 5-Limiting protrusion; 6-Second telescopic component; 7-Sealing block; 8-Third telescopic component; 9-Support rod; 10-First fixing plate; 11-Feeding hopper; 12-Second fixing plate; 13-First telescopic component; 14-Extrusion rod; 15-Heating component; 16-Through hole; 17-First mounting seat; 18-Extrusion plate; 19-Second mounting seat; 20-Detachable module; 21-Third mounting seat; 22-Fourth telescopic component. Detailed Implementation

[0015] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0016] like Figure 1 , 2 As shown, this utility model discloses a technical solution: an injection mold for an injection molding machine, including a frame 1. The frame 1 serves as the mounting and support foundation for the entire mold, providing a stable mounting platform for all components. A mold cavity 2 is fixedly mounted on the upper surface of the frame 1 by bolts. The mold cavity 2 provides a cavity space for the molding of the injection-molded product, and its internal shape is adapted to the shape of the injection-molded product. The cavity surface of the mold cavity 2 is polished, with a roughness Ra≤0.8μm.

[0017] An injection cylinder 3 is fixedly mounted on the upper surface of the mold cavity 2 via a support frame. The support frame provides stable support for the injection cylinder 3, ensuring its stable position during the injection process. An injection tube 4 is connected to the center of the top of the mold cavity 2. The injection tube 4 serves as a material conveying channel, with one end connected to the inside of the mold cavity 2 and the other end sealed to the bottom of the injection cylinder 3, ensuring that the molten material can smoothly enter the mold cavity 2 from the injection cylinder 3.

[0018] An extrusion mechanism is fixedly installed on the support frame. This extrusion mechanism can stably and uniformly extrude the molten injection material in the injection cylinder 3 into the injection tube 4, thereby ensuring that the material fills the mold cavity 2. Specifically, the support frame includes two vertically symmetrical support rods 9. The bottom of the support rods 9 is welded and fixed to the upper surface of the mold cavity 2. A first fixing plate 10 is horizontally welded between the middle of the two support rods 9. The injection cylinder 3 is vertically installed through the first fixing plate 10. The top of the injection cylinder 3 passes through the upper surface of the first fixing plate 10 and is integrally formed with a funnel-shaped discharge hopper 11. The discharge hopper 11 facilitates the addition of injection material into the injection cylinder 3 while preventing material spillage.

[0019] A second fixing plate 12 is bolted between the tops of the two support rods 9, providing a mounting carrier for the extrusion mechanism. The extrusion mechanism includes a first telescopic assembly 13 and an extrusion rod 14 connected to the telescopic end of the first telescopic assembly 13. The first telescopic assembly 13 is preferably a hydraulic telescopic rod, vertically fixed to the upper surface of the second fixing plate 12. The telescopic end of the first telescopic assembly 13 passes through the lower surface of the second fixing plate 12 and is fixedly connected to the extrusion rod 14 via a flange. The outer diameter of the extrusion rod 14 matches the inner diameter of the injection molding cylinder 3, ensuring that the extrusion rod 14 can extend into the interior of the injection molding cylinder 3 and fit tightly against the inner wall of the injection molding cylinder 3, achieving sufficient extrusion of the material.

[0020] To ensure that the injection molding material inside the injection cylinder 3 is always in a molten state and facilitates extrusion and conveying, multiple sets of heating components 15 are evenly arranged on the outer wall of the injection cylinder 3 along its length. The heating components 15 are made of electric heating wires and are fixed to the outer wall of the injection cylinder 3 by wrapping them with an insulation sleeve. The heating components 15 are electrically connected to an external temperature control device, which can achieve precise control of the heating temperature.

[0021] To meet the molding requirements of the notch on the injection-molded product, the left and right sides of the mold cavity 2 are equipped with limiting protrusions 5 that match the notch on the injection-molded product. The shape and size of the limiting protrusions 5 are perfectly matched with the notch on the product, ensuring the molding accuracy of the notch. The limiting protrusions 5 are moved left and right by two second telescopic components 6. The second telescopic components 6 are electric telescopic rods. The left and right sides of the mold cavity 2 are provided with through holes 16 that are adapted to the limiting protrusions 5. The through holes 16 allow the limiting protrusions 5 to smoothly enter or exit the mold cavity 2. The second telescopic components 6 are fixedly installed on the upper surface of the frame 1 by a first mounting base 17. The first mounting base 17 and the frame 1 are detachably connected by bolts for easy maintenance and replacement. An extrusion plate 18 is fixedly installed on the telescopic end of the second telescopic components 6 by bolts. The side wall of the extrusion plate 18 near the mold cavity 2 is integrally formed with the limiting protrusion 5. The extrusion plate 18 increases the connection area between the second telescopic components 6 and the limiting protrusion 5, improving the stability of the limiting protrusion 5 during movement.

[0022] To achieve the opening, closing, and sealing of the mold cavity 2, the front of the mold cavity 2 is open, and a sealing block 7 adapted to the opening is provided on the front of the mold cavity 2. The material of the sealing block 7 is the same as that of the mold cavity 2 to ensure stable molding temperature. The sealing block 7 is driven to move back and forth by the third telescopic component 8. The third telescopic component 8 is a pneumatic telescopic rod, which is fixedly installed on the upper surface of the frame 1 by the second mounting base 19, and the telescopic end of the third telescopic component 8 is fixedly connected to the sealing block 7 by bolts to ensure that the sealing block 7 can tightly fit the front opening of the mold cavity 2 to achieve a seal.

[0023] To achieve automatic demolding of injection-molded products and avoid damage caused by manual demolding, the mold cavity 2 has a rear opening, and a demolding module 20 is provided inside the rear of the mold cavity 2. The size of the demolding module 20 is adapted to the internal cross-section of the mold cavity 2, allowing it to move smoothly within the mold cavity 2. A fourth telescopic component 22 is fixedly mounted on the upper surface of the frame 1 via a third mounting base 21. The fourth telescopic component 22 is preferably a hydraulic telescopic rod, and its telescopic end is fixedly connected to the demolding module 20 by welding. The fourth telescopic component 22 can drive the demolding module 20 to move back and forth. After injection molding, the fourth telescopic component 22 pushes the demolding module 20 to push the finished product out from the front opening of the mold cavity 2, achieving automatic demolding.

[0024] The working process for this application is as follows: 1. Preparation stage: The PLC control system starts each component. The third telescopic component 8 drives the sealing block 7 to move forward and tightly fit the front opening of the mold cavity 2 to achieve a seal. The second telescopic component 6 drives the limiting protrusion 5 to pass through the through hole 16 and extend into the mold cavity 2 to reach the preset molding position. The heating component 15 starts to work, raising the internal temperature of the injection cylinder 3 to 230°C and keeping it stable.

[0025] 2. Injection molding stage: The raw material granules are added into the injection cylinder 3 through the feeding hopper 11. The granules are melted into liquid under the action of the heating component 15. The first telescopic component 13 drives the extrusion rod 14 to move downward, and extrudes the molten material into the mold cavity 2 through the injection tube 4 until the material fills the entire cavity. The extrusion pressure is maintained at 5MPa and the holding time is 10s.

[0026] 3. Demolding stage: After the pressure holding is completed, the heating component 15 stops working and the mold cavity 2 cools naturally to 80°C; the second telescopic component 6 drives the limiting protrusion 5 to move backward and exit the mold cavity 2; the third telescopic component 8 drives the sealing block 7 to move backward and open the front opening of the mold cavity 2; the fourth telescopic component 22 drives the demolding module 20 to move forward and push the molded finished product out of the front opening of the mold cavity 2, completing the demolding; all components are reset and the next production cycle begins.

[0027] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection mold for an injection molding machine, comprising a frame (1), characterized in that: The upper surface of the frame (1) is equipped with a mold cavity (2), and the upper surface of the mold cavity (2) is equipped with an injection cylinder (3) through a support frame. The top of the mold cavity (2) is connected to an injection tube (4), and the bottom of the injection cylinder (3) is connected to the injection tube (4). An extrusion mechanism is installed on the support frame, which can extrude the material in the injection cylinder (3) to the injection tube (4). The left and right sides of the mold cavity (2) are provided with limiting protrusions (5) that are consistent with the notches on the injection molded products, and the corresponding limiting protrusions (5) are moved left and right by the two second telescopic components (6). The front side of the mold cavity (2) is open, and the front side of the mold cavity (2) is provided with a sealing block (7), and the sealing block (7) is moved back and forth by the third telescopic component (8).

2. The injection mold for an injection molding machine according to claim 1, characterized in that: The support frame includes two vertically arranged support rods (9) on the left and right, and a first fixing plate (10) is installed between the middle of the two support rods (9). The injection cylinder (3) is vertically installed on the first fixing plate (10), and a funnel-shaped discharge hopper (11) is provided after the top of the injection cylinder (3) passes through the upper surface of the first fixing plate (10).

3. The injection mold for an injection molding machine according to claim 2, characterized in that: A second fixing plate (12) is installed between the tops of the two support rods (9). The extrusion mechanism includes a first telescopic component (13) and an extrusion rod (14) connected to the telescopic end of the first telescopic component (13). The first telescopic component (13) is vertically fixed on the second fixing plate (12). The telescopic end of the first telescopic component (13) passes through the lower surface of the second fixing plate (12) and is fixedly connected to the extrusion rod (14). The extrusion rod (14) can extend into the interior of the injection cylinder (3).

4. The injection mold for an injection molding machine according to claim 1, characterized in that: The outer wall of the injection molding cylinder (3) is provided with multiple sets of heating components (15) along the extended length direction.

5. The injection mold for an injection molding machine according to claim 1, characterized in that: The mold cavity (2) has through holes (16) on both the left and right sides that are adapted to the limiting protrusion (5). The second telescopic component (6) is installed on the upper surface of the frame (1) through the first mounting base (17). The telescopic end of the second telescopic component (6) is equipped with an extrusion plate (18), and the side wall of the extrusion plate (18) is provided with the limiting protrusion (5).

6. The injection mold for an injection molding machine according to claim 1, characterized in that: The third telescopic component (8) is mounted on the upper surface of the frame (1) via the second mounting base (19), and the telescopic end of the third telescopic component (8) is connected to the sealing block (7).

7. The injection mold for an injection molding machine according to claim 1, characterized in that: The mold cavity (2) has a rear opening, and a release module (20) is installed inside the rear side of the mold cavity (2). A fourth telescopic component (22) is installed on the upper surface of the frame (1) through a third mounting base (21). The telescopic end of the fourth telescopic component (22) is connected to the release module (20), and the fourth telescopic component (22) can drive the release module (20) to move back and forth.

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