Structure of pneumatic ejector pin of mold for precision casting

Abstract

The utility model relates to the technical field of precision casting, and discloses a pneumatic ejector pin structure of a die for precision casting, which comprises a base and a movable die, a pneumatic mechanism is arranged at the bottom of the base, a plurality of guide rods are arranged between the base and the movable die, and a fixed die is arranged at the top of the base. A material injection pipe is arranged on the side, away from the base, of the movable mold, a plurality of airflow channels are formed in the fixed mold, a jacking mechanism is arranged in each airflow channel and comprises a guide sleeve, a stress plate is slidably connected to the interior of each guide sleeve, and a piston rod is fixedly connected to the top of each stress plate. According to the ejector pin system, the limiting ring and the reset springs are arranged in the guide sleeve, so that the piston rod can be prevented from being abraded in the product jacking process, the automatic reset function of the piston rod can be effectively provided, and long-time stable operation of the ejector pin system is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of precision casting technology, and in particular to the structure of a pneumatic ejector pin for a precision casting mold. Background Technology

[0002] Currently, precision casting technology is widely used in the manufacturing of high-precision parts, especially in industries such as aerospace, automotive, and electronics, where the quality requirements for castings are becoming increasingly stringent. During the casting process, the ejector system of the mold plays a crucial role, not only responsible for ejecting the casting but also ensuring the smoothness and efficiency of the ejection process. With the improvement of automation and intelligence, the design of ejector systems is constantly evolving towards higher precision and higher efficiency. While traditional mechanical spring ejectors and manual control methods can meet basic requirements, with the acceleration of production cycles and the increase in the complexity of castings, existing technologies are gradually revealing several shortcomings.

[0003] To address the aforementioned needs, existing pneumatic ejector systems control ejector movement via airflow, offering high flexibility and automation. However, these systems generally employ a single guiding device or simple airflow control, lacking precise ejector positioning and automatic reset functions. The guide devices often lack precision, leading to ejector deviation during operation and affecting the smoothness of the ejection process. Furthermore, the reset spring design frequently fails to consider the ejector's automatic recovery capability under high-frequency operation, resulting in poor equipment stability, frequent maintenance, and even reduced production efficiency. Especially in applications requiring frequent ejector replacement, traditional installation methods are overly complex and cannot meet the needs for rapid disassembly and replacement, which is extremely inconvenient in rapid production processes.

[0004] To address the above problems, a pneumatic ejector pin structure for precision casting molds is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a structure for a pneumatic ejector pin for precision casting molds, aiming to solve the problems of inaccurate pin positioning, unstable guidance, and incomplete reset in the existing structure of a pneumatic ejector pin for precision casting molds.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a structure for a pneumatic ejector pin of a precision casting mold, comprising a base and a moving mold, wherein a pneumatic mechanism is provided at the bottom of the base, multiple guide rods are provided between the base and the moving mold, a fixed mold is provided at the top of the base, an injection tube is provided on the side of the moving mold away from the base, multiple airflow channels are provided inside the fixed mold, and a lifting mechanism is provided inside the airflow channels, the lifting mechanism comprising a guide sleeve, a force-bearing plate is slidably connected inside the guide sleeve, and a piston rod is fixedly connected to the top of the force-bearing plate, a limit ring is provided on the side of the guide sleeve away from the force-bearing plate, multiple return springs are arranged around the force-bearing plate and the limit ring, and a seat-changing assembly is provided on the top of the piston rod.

[0007] As a further description of the above technical solution:

[0008] The bottom of the force-bearing plate is provided with a buffer rubber pad, and the bottom of the inner side of the guide sleeve is provided with an inner groove.

[0009] As a further description of the above technical solution:

[0010] The guide sleeve is fixedly connected inside the airflow channel.

[0011] As a further description of the above technical solution:

[0012] The replacement assembly includes a mounting base and a ejector pin, with the bottom of the ejector pin fixedly connected inside the mounting base.

[0013] As a further description of the above technical solution:

[0014] The piston rod has a mounting groove at its top, and the mounting seat is inserted into the mounting groove.

[0015] As a further description of the above technical solution:

[0016] Two snap-fit ​​components are symmetrically arranged on the outer side of the mounting base. Each snap-fit ​​component includes a rotating block, the inside of which is provided with a sliding groove, and a snap-fit ​​block is slidably connected inside the rotating block. A limit plate is fixedly connected to the outer side of the snap-fit ​​block, and a top spring is sleeved on the outer side of the snap-fit ​​block.

[0017] As a further description of the above technical solution:

[0018] The rotating block has a sliding groove inside, the limiting plate is slidably connected inside the sliding groove, one end of the top spring is fixedly connected to the outside of the limiting plate, and the other end of the top spring is fixedly connected to the inner wall of the sliding groove.

[0019] As a further description of the above technical solution:

[0020] The rotating block is slidably connected inside the mounting groove, and the locking block abuts against the inner wall of the mounting groove.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, a limit ring and multiple return springs are provided inside the guide sleeve, which can not only prevent the piston rod from wearing during the lifting process, but also effectively provide the piston rod with an automatic reset function, ensuring the long-term stable operation of the ejector pin system.

[0023] 2. In this utility model, an installation groove is opened at the top of the piston rod, and the ejector pin and the mounting seat can be quickly installed at the top of the piston rod. The locking blocks on both sides of the mounting seat are tightly attached to the inner wall of the installation groove under the action of the top spring, which increases the convenience of ejector pin installation, and also enables quick disassembly and replacement, reducing maintenance costs and improving production efficiency. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the structure of a pneumatic ejector pin for a precision casting mold proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the fixed mold structure of the pneumatic ejector pin for a precision casting mold proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the force-bearing plate of a pneumatic ejector pin for a precision casting mold proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the mounting groove for a pneumatic ejector pin in a precision casting mold, as proposed in this utility model.

[0028] Figure 5 This is a schematic diagram of the locking block of a pneumatic ejector pin for a precision casting mold proposed in this utility model.

[0029] Legend:

[0030] 1. Base; 2. Pneumatic mechanism; 3. Moving mold; 4. Fixed mold; 5. Guide rod; 6. Injection tube; 7. Airflow channel; 8. Lifting mechanism; 81. Guide sleeve; 82. Piston rod; 821. Mounting groove; 83. Force plate; 84. Limit ring; 85. Return spring; 86. Seat changing assembly; 861. Mounting seat; 862. Ejector pin; 87. Snap-fit ​​assembly; 871. Rotating block; 872. Snap block; 873. Limit plate; 874. Top spring. Detailed Implementation

[0031] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 - Figure 2 This utility model provides an embodiment of a pneumatic ejector pin structure for a precision casting mold, comprising a base 1 and a moving mold 3. A pneumatic mechanism 2 is installed at the bottom of the base 1, comprising a cylinder, an airflow control valve, and a solenoid valve, capable of adjusting the inflow and outflow of gas as needed to control the ejection and retraction actions of the lifting system. Multiple guide rods 5 are provided between the base 1 and the moving mold 3. A fixed mold 4 is installed at the top of the base 1, and the fixed mold 4 and the moving mold 3 are precisely machined together to form an accurate mold cavity between the fixed mold 4 and the moving mold 3. A slurry pipe 6 is provided on the side of the moving mold 3 away from the base 1, which can adapt to the pouring requirements of castings of different specifications, ensuring smooth injection of the casting into the mold cavity. Multiple airflow channels 7 are provided inside the fixed mold 4, which adopt a circular design to ensure smooth airflow. A lifting mechanism 8 is installed inside the airflow channels 7, capable of ejecting the workpiece according to the working state of the pneumatic mechanism 2.

[0033] Reference Figure 3 - Figure 4The lifting mechanism 8 includes a guide sleeve 81, which is fixedly connected inside the airflow channel 7 to ensure that the lifting system maintains a stable movement trajectory when airflow passes through. The guide sleeve 81 is made of a highly wear-resistant material, and its inner wall is precision-machined to ensure that it will not wear during long-term use and maintains guiding accuracy. A force-bearing plate 83 is slidably connected inside the guide sleeve 81. The force-bearing plate 83 is connected to the guide sleeve 81 through a sliding fit to ensure that the force-bearing plate 83 can slide smoothly within the guide sleeve 81 without jamming. A buffer rubber pad is provided at the bottom of the force-bearing plate 83. This design can effectively reduce the impact force when the ejector pin 862 retracts, protect the mold and casting surface, and avoid damage or deformation due to sudden mechanical impact, thereby improving the stability and service life of the system. A piston rod 82 is fixedly connected to the top of the force-bearing plate 83. The piston rod 82 moves up and down under air pressure control, pushing or retracting the ejector pin 862 to realize the ejection operation. To ensure the accuracy of the piston rod 82 during operation, a limiting ring 84 is provided inside the guide sleeve 81 on the side away from the force plate 83. The limiting ring 84 restricts the stroke of the piston rod 82, preventing it from falling off or excessively moving during operation, thus ensuring safety and stability. Multiple return springs 85 are arranged around the force plate 83 and the limiting ring 84. After the ejector pin 862 is ejected, the return springs 85 can quickly return the force plate 83 to its original position, ensuring that the ejector pin 862 can quickly recover after each operation and be ready for the next operation. A seat-changing assembly 86 is provided at the top of the piston rod 82. The seat-changing assembly 86 includes a mounting base 861 and an ejector pin 862. The bottom of the ejector pin 862 is fixedly connected to the inside of the mounting base 861. The mounting base 861 is designed to be pluggable, facilitating the replacement of ejector pins 862 of different specifications to adapt to different types of castings. The piston rod 82 has a mounting groove 821 on its top. The mounting seat 861 is installed in the mounting groove 821 by plugging and rotating. This plugging method makes the installation and disassembly process more convenient and quick, reduces downtime for maintenance during production, and improves production efficiency.

[0034] Reference Figure 5Two snap-fit ​​components 87 are symmetrically arranged on the outer side of the mounting base 861. These components ensure easier and faster installation and removal of the ejector pin 862. Each snap-fit ​​component 87 includes a rotating block 871 with a sliding groove inside. A locking block 872 is slidably connected inside the rotating block 871, allowing it to slide along a specific trajectory within the groove. A limiting plate 873 is fixedly connected to the outer side of the locking block 872 to prevent excessive outward sliding and ensure that the snap-fit ​​components 87 do not loosen or fall off during operation. A top spring 874 is fitted onto the outer side of the locking block 872, providing necessary support when it slides, ensuring a tight fit between the locking block 872 and the inner wall of the mounting groove 821, and allowing the locking block 872 to quickly return to its original position and remain stable within the mounting groove 821.

[0035] Working Principle: During operation, the pneumatic mechanism 2 controls the airflow into the airflow channel 7, pushing the piston rod 82 in the lifting mechanism 8 to move up and down, thereby driving the mounting base 861 and the ejector pin 862 to be ejected or retracted. The piston rod 82 is slidably connected to the force plate 83 through the guide sleeve 81 and returns to its original position through the return spring 85. The mounting base 861 and the snap-fit ​​assembly 87 are connected by the rotating block 871 and the snap-fit ​​block 872. The rotating block 871 guides the snap-fit ​​block 872 to slide through the slide groove. During operation, the snap-fit ​​block 872 abuts against the inner wall of the mounting groove 821 to ensure the stability of the ejector pin 862. The snap-fit ​​block 872 cooperates with the limiting plate 873 and the top spring 874. The top spring 874 provides a restoring force when the snap-fit ​​block 872 slides, enabling the snap-fit ​​assembly 87 to be quickly disassembled and installed. During operation, the airflow passes through the airflow channel 7, which drives the lifting mechanism 8 to precisely eject the ejector pin 862, completing the ejection and retraction of the casting. Afterward, the return spring 85 returns the component to its initial state, preparing it for the next cycle of operation.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure for a pneumatic ejector pin in a precision casting mold, comprising a base (1) and a moving mold (3), characterized in that: A pneumatic mechanism (2) is provided at the bottom of the base (1). Multiple guide rods (5) are provided between the base (1) and the moving mold (3). A fixed mold (4) is provided at the top of the base (1). An injection pipe (6) is provided on the side of the moving mold (3) away from the base (1). Multiple airflow channels (7) are provided inside the fixed mold (4). A lifting mechanism (8) is provided inside the airflow channels (7). The lifting mechanism (8) includes a guide sleeve (81). A force plate (83) is slidably connected inside the guide sleeve (81). A piston rod (82) is fixedly connected to the top of the force plate (83). A limit ring (84) is provided on the side of the guide sleeve (81) away from the force plate (83). Multiple return springs (85) are arranged around the force plate (83) and the limit ring (84). A seat changing assembly (86) is provided on the top of the piston rod (82).

2. The structure of a pneumatic ejector pin for a precision casting mold according to claim 1, characterized in that: The bottom of the force plate (83) is provided with a buffer rubber pad, and the bottom of the inner side of the guide sleeve (81) is provided with an inner groove.

3. The structure of a pneumatic ejector pin for a precision casting mold according to claim 1, characterized in that: The guide sleeve (81) is fixedly connected inside the airflow channel (7).

4. The structure of a pneumatic ejector pin for a precision casting mold according to claim 1, characterized in that: The seat replacement assembly (86) includes a mounting base (861) and a ejector pin (862), the bottom of which is fixedly connected to the interior of the mounting base (861).

5. The structure of a pneumatic ejector pin for a precision casting mold according to claim 4, characterized in that: The piston rod (82) has a mounting groove (821) at its top, and the mounting seat (861) is inserted into the mounting groove (821).

6. The structure of a pneumatic ejector pin for a precision casting mold according to claim 5, characterized in that: Two snap-fit ​​components (87) are symmetrically arranged on the outer side of the mounting base (861). Each snap-fit ​​component (87) includes a rotating block (871), which has a sliding groove inside. A locking block (872) is slidably connected inside the rotating block (871). A limiting plate (873) is fixedly connected to the outer side of the locking block (872), and a top spring (874) is sleeved on the outer side of the locking block (872).

7. The structure of a pneumatic ejector pin for a precision casting mold according to claim 6, characterized in that: The rotating block (871) has a sliding groove inside, the limiting plate (873) is slidably connected inside the sliding groove, one end of the top spring (874) is fixedly connected to the outside of the limiting plate (873), and the other end of the top spring (874) is fixedly connected to the inner wall of the sliding groove.

8. The structure of a pneumatic ejector pin for a precision casting mold according to claim 7, characterized in that: The rotating block (871) is slidably connected inside the mounting groove (821), and the locking block (872) abuts against the inner wall of the mounting groove (821).

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