多级缓冲式顶针防卡死机构
By designing a multi-stage buffer ejector pin anti-jamming mechanism, and utilizing a combination of springs and airbags for buffering, the problem of ejector pin jamming caused by wear and lateral force imbalance during mold processing is solved, thereby improving the reliability of the mold and the product yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHUANGSITE PRECISION MACHINERY KUNSHAN CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional ejector pins are prone to jamming during mold processing due to wear and lateral force imbalance, especially in thin-walled/deep-cavity parts and high-temperature conditions. Existing hydraulic buffers cannot balance buffering performance and long-term reliability, resulting in high mold downtime and low product yield.
The design incorporates a multi-stage buffered ejector pin anti-jamming mechanism, including a first buffer structure, a second buffer structure, and a pneumatic component. Through multi-stage buffering and anti-jamming mechanisms, the combined buffering effect of springs and airbags is utilized to achieve multi-stage buffering and anti-jamming of the ejector pin.
It improves the reliability of ejector pins, reduces mold downtime, and increases product yield. The multi-stage buffer structure effectively prevents ejector pin jamming, enhancing mold stability and production efficiency.
Smart Images
Figure CN224510183U_ABST
Abstract
Claims
1. A multi-stage buffer type ejector pin anti-stuck mechanism, comprising an ejector pin telescopic hole (1) arranged at the bottom of a mold cavity of a lower mold base, characterized in that: The bottom of the telescopic hole (1) of the ejector pin is connected to a fixed cavity (2), and a movable ejector pin cylinder (3) is inserted inside the telescopic hole (1). A fixed vertical rod (4) is provided at the bottom of the movable ejector pin cylinder (3) in the vertical direction and is fixedly connected to the inner wall of the bottom of the fixed cavity (2). A first buffer structure is provided between the fixed vertical rod (4) and the interior of the movable ejector pin cylinder (3). A second buffer structure is provided between the two outer walls of the movable ejector pin cylinder (3) and the two inner walls of the telescopic hole (1). Pneumatic components (8) for buffering the movement of the movable ejector pin cylinder (3) in the vertical direction are provided inside the fixed cavity (2) on both sides of the fixed vertical rod (4).
2. The multi-stage buffer-type needle sticking prevention mechanism according to claim 1, characterized in that: The first buffer structure includes a movable plate (9) fixedly connected to the top of the fixed vertical rod (4). The movable plate (9) is located inside the movable top needle cylinder (3). The movable top needle cylinder (3) has a movable cavity (10) located in the vertical direction corresponding to the outside of the movable plate (9). A second spring (11) is connected between the top of the movable plate (9) and the top inner wall of the movable cavity (10).
3. The multi-stage buffer-type needle sticking prevention mechanism according to claim 2, characterized in that: Both the movable plate (9) and the fixed vertical rod (4) are cylindrical structures. The bottom of the movable ejector cylinder (3) is provided with a hole for the fixed vertical rod (4) to pass through. The bottom end of the fixed vertical rod (4) is fixedly connected to the bottom of the fixed cavity (2).
4. The multi-stage buffer-type needle sticking prevention mechanism according to claim 1, characterized in that: The second buffer structure includes a fixed plate (5) fixedly connected to the outer wall of the middle part of the movable ejector cylinder (3). The two inner walls of the ejector telescopic hole (1) are provided with movable grooves (6) in the vertical direction corresponding to the outside of the fixed plate (5). A first spring (7) is fixedly connected between the bottom end of the fixed plate (5) and the bottom inner wall of the movable groove (6).
5. The multi-stage buffer-type needle sticking prevention mechanism according to claim 1, characterized in that: The pneumatic assembly (8) includes a fixed cylinder (801) fixedly connected to the inner wall of the bottom of the fixed cavity (2). A telescopic rod (802) fixedly connected to the bottom of the movable ejector cylinder (3) is inserted vertically at the top of the fixed cylinder (801). A piston block (803) is fixedly connected to the bottom of the ejector telescopic hole (1) at the bottom end of the telescopic rod (802). An air chamber (804) is provided vertically inside the fixed cylinder (801) corresponding to the outside of the piston block (803). An air bag (806) is provided on the outside of the fixed cylinder (801). A connecting pipe (807) is connected between the air bag (806) and the fixed cylinder (801).
6. The multi-stage buffer-type needle sticking prevention mechanism according to claim 5, characterized in that: The piston block (803) is wrapped with a rubber sleeve. The outer wall of the fixed cylinder (801) is provided with a through hole (805) at the connection point of the connecting pipe (807). The connecting pipe (807) is connected to the bottom of the air chamber (804) through the through hole (805).
7. The multi-stage buffer-type needle sticking prevention mechanism according to claim 1, characterized in that: The inner diameter of the cross-section of the telescopic hole (1) of the ejector pin is larger than the outer diameter of the cross-section of the movable ejector pin cylinder (3).