Ejection piston structure of injection molding machine
By introducing guide rods, buffer components, and fixing components into the injection molding machine, the problem of finished product damage caused by uneven force during ejection is solved, and the replacement of ejector rods is simplified, achieving more efficient finished product protection and convenient replacement.
Patent Information
- Application Number
- CN202520448503.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-14
AI Technical Summary
The existing ejection structure of injection molding machines suffers from uneven force distribution when rapidly ejecting finished products, which makes the finished products prone to damage. Furthermore, the replacement of traditional ejection rods is inconvenient.
The design incorporates guide rods, buffer components, and fixing components. The movement speed of the ejector plate is buffered by a damper, and the ejector rod can be easily replaced using a spring and locking pin structure.
It improves the stability and integrity of the finished product ejection process, prevents damage to the finished product, and simplifies the replacement process of the ejection rod.
Smart Images
Figure CN223864239U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection molding machine technology, and in particular to an ejector piston structure for an injection molding machine. Background Technology
[0002] In the injection molding industry, the ejector piston structure of the injection molding machine plays a crucial role. With the continuous expansion of applications for plastic products, the market is placing higher demands on both the quantity and quality of these products. An efficient, stable ejector structure that ensures product quality has become an important element in improving the efficiency of injection molding production, and is of great significance for ensuring the smooth operation of the injection molding process and the quality of plastic products.
[0003] Current injection molding machine ejection structures mostly employ relatively direct mechanical connections and power transmission methods. Generally, a single hydraulic cylinder directly pushes the ejector plate, and the ejector rod on the ejector plate, under the action of the cylinder, directly ejects the molded plastic product from the mold. In this process, the hydraulic cylinder primarily provides a stable thrust to achieve the ejection action.
[0004] When the ejector rod rapidly ejects the finished product, the lack of an effective buffering and force balancing mechanism easily leads to uneven force distribution. Under the direct push of a single hydraulic cylinder, the movement speed of different parts of the ejector plate is difficult to achieve perfectly uniformity, resulting in variations in the force applied by the ejector rod to different positions on the finished product. This uneven force distribution makes the finished product susceptible to deformation, cracking, and other damage at the moment of demolding, especially in weak areas or stress concentration zones due to excessive localized pressure. Therefore, an ejector piston structure for injection molding machines is proposed to address these issues. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides an ejector piston structure for an injection molding machine, which aims to improve the problem of uneven force distribution when the ejector rod rapidly ejects the finished product in the prior art, which leads to easy damage to the finished product.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] An ejector piston structure for an injection molding machine includes a guide rod, a mold is provided on the side wall of the guide rod, a tail plate is fixedly connected to the side wall of the guide rod, a hydraulic cylinder is fixedly connected to the side wall of the tail plate, an ejector plate is slidably connected to the side wall of the guide rod, the output end of the hydraulic cylinder is connected to the ejector plate, a buffer assembly is provided on the side wall of the ejector plate, and a fixing assembly is provided on the side wall of the ejector plate.
[0008] The buffer assembly includes a fixed frame, the side wall of which is fixedly connected to the side wall of the mold, a fixed rod fixedly connected inside the fixed frame, a slider slidably connected to the side wall of the fixed rod, a first spring sleeved on the side wall of the fixed rod, a damper fixedly installed between the fixed frame and the slider, a pair of rotating rods rotatably connected to the side wall of the slider, a fixed frame fixedly connected to the side wall of the ejector plate, and rotating rods rotatably connected inside the fixed frame;
[0009] As a further description of the above technical solution:
[0010] The fixing component includes a fixing ring, the side wall of which is fixedly connected to the side wall of the ejector plate, and an ejector rod is slidably connected inside the fixing ring;
[0011] As a further description of the above technical solution:
[0012] A connecting post is slidably connected inside the fixed ring, and the connecting post is slidably connected inside the ejector rod;
[0013] As a further description of the above technical solution:
[0014] A fixing block is fixedly connected to the side wall of the fixing ring, and a locking post is slidably connected inside the fixing block;
[0015] As a further description of the above technical solution:
[0016] The locking pin is slidably connected inside the fixing ring, the ejector rod and the connecting pin;
[0017] As a further description of the above technical solution:
[0018] A pull ring is fixedly connected to the side wall of the locking post, and a second spring is sleeved on the side wall of the locking post;
[0019] As a further description of the above technical solution:
[0020] One end of the second spring is fixedly connected to the side wall of the pull ring, and the other end of the second spring is fixedly connected to the side wall of the fixing block;
[0021] As a further description of the above technical solution:
[0022] One end of the first spring is fixedly connected inside the fixed frame, and the other end of the first spring is fixedly connected to the side wall of the slider.
[0023] This utility model has the following beneficial effects:
[0024] 1. In this utility model, the starting cylinder pushes the ejector plate to slide along the side wall of the guide rod. The movement of the ejector plate drives the rotating rod to rotate, pushing the slider to slide along the side wall of the fixed rod, squeezing the first spring and the damper. The damper buffers the force of the ejector plate movement to prevent it from moving too fast and avoids damage when the ejector rod ejects the finished product. This solves the problem that the uneven force on the finished product when the ejector rod quickly ejects the finished product causes it to be easily damaged. The above technical solution improves the stability and integrity of the finished product ejection process.
[0025] 2. In this utility model, the ejector rod is prone to wear after long-term use. Pulling the pull ring moves the locking pin, causing the second spring to extend. The locking pin moves out of the fixing ring, releasing the fixing of the connecting pin. The connecting pin can then be pulled out, and the ejector rod can be removed for replacement. This solves the problem that the traditional ejector rod is fixed with bolts, and disassembly and replacement require tools, which is quite troublesome. The above technical solution improves the convenience and efficiency of ejector rod replacement. Attached Figure Description
[0026] Figure 1 This is a three-dimensional schematic diagram of the ejector piston structure of an injection molding machine according to the present invention.
[0027] Figure 2 This is a schematic diagram of the internal structure of the fixing frame of the ejector piston structure of an injection molding machine according to the present invention.
[0028] Figure 3 This is a schematic diagram of the ejector plate structure of the ejector piston structure of an injection molding machine proposed in this utility model;
[0029] Figure 4 This is a schematic diagram of the ejector rod structure of the ejector piston structure of an injection molding machine proposed in this utility model;
[0030] Figure 5 for Figure 4 Enlarged view of point A in the middle.
[0031] Legend:
[0032] 1. Guide rod; 2. Mold; 3. Tail plate; 4. Hydraulic cylinder; 5. Ejector plate; 6. Fixing frame; 7. Fixing rod; 8. Slider; 9. First spring; 10. Damper; 11. Rotating rod; 12. Fixing frame; 13. Fixing ring; 14. Ejector rod; 15. Connecting column; 16. Fixing block; 17. Locking column; 18. Pull ring; 19. Second spring. Detailed Implementation
[0033] 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.
[0034] Reference Figure 1 - Figure 3 This utility model provides an embodiment of an ejector piston structure for an injection molding machine, comprising a guide rod 1, a mold 2 disposed on the side wall of the guide rod 1, a tail plate 3 fixedly connected to the side wall of the guide rod 1, a hydraulic cylinder 4 fixedly connected to the side wall of the tail plate 3, an ejector plate 5 slidably connected to the side wall of the guide rod 1, the output end of the hydraulic cylinder 4 being connected to the ejector plate 5, a buffer assembly disposed on the side wall of the ejector plate 5, and a fixing assembly disposed on the side wall of the ejector plate 5; the buffer assembly includes a fixing frame 6, the side wall of the fixing frame 6 being fixedly connected to the side wall of the mold 2, and a fixing component being fixedly connected inside the fixing frame 6. A fixed rod 7 is slidably connected to a slider 8 on its side wall. A first spring 9 is sleeved on the side wall of the fixed rod 7. A damper 10 is fixedly installed between the fixed frame 6 and the slider 8. The damper 10 is used to buffer the ejector plate 5 and prevent the ejector plate 5 from moving too fast. A pair of rotating rods 11 are rotatably connected to the side wall of the slider 8. A fixed frame 12 is fixedly connected to the side wall of the ejector plate 5. The rotating rods 11 are rotatably connected inside the fixed frame 12. One end of the first spring 9 is fixedly connected inside the fixed frame 6, and the other end of the first spring 9 is fixedly connected to the side wall of the slider 8.
[0035] When the finished product formed inside mold 2 is ejected, hydraulic cylinder 4 is activated. Hydraulic cylinder 4 serves as the power source for the ejection action. Through the pressure provided by the hydraulic system, it pushes ejector plate 5. Ejector plate 5 slides against the side wall of guide rod 1. Guide rod 1 guides the movement of ejector plate 5, preventing deviation or wobbling. As ejector plate 5 moves, rotating rod 11 rotates. Rotating rod 11 transmits and converts force, transforming the linear motion of ejector plate 5 into a pushing action on slider 8. When rotating rod 11 rotates, it pushes slider 8 to slide against the side wall of fixed rod 7. Fixed rod 7 provides a sliding track for slider 8. During movement, slider 8 compresses the first spring 9. The first spring 9 has a buffering and energy storage function. When slider 8 compresses the first spring 9, the first spring 9 absorbs some energy, slowing down the movement speed of slider 8 and storing the energy. Simultaneously, the movement of slider 8 compresses damper 10, which mainly dissipates energy and buffers impact. The force of the ejector plate 5 moving is transmitted to the damper 10 through the rotating rod 11 and the slider 8. The damper 10 buffers the force to prevent the ejector plate 5 from moving too fast. If the ejector plate 5 moves too fast, the ejector rod 14 will generate a large impact force when ejecting the finished product, which may damage the finished product. The buffering effect of the damper 10 can avoid this situation and protect the integrity of the finished product.
[0036] Reference Figure 3 - Figure 5 The fixing assembly includes a fixing ring 13, the side wall of the fixing ring 13 is fixedly connected to the side wall of the ejector plate 5, the inside of the fixing ring 13 is slidably connected to an ejector rod 14, and the inside of the fixing ring 13 is slidably connected to a connecting post 15. The fixing ring 13 and the connecting post 15 are used together to fix the ejector rod 14. The connecting post 15 is slidably connected inside the ejector rod 14. The side wall of the fixing ring 13 is fixedly connected to a fixing block 16, and the inside of the fixing block 16 is slidably connected to a locking post 17. The locking post 17 is slidably connected inside the fixing ring 13, the ejector rod 14 and the connecting post 15. The side wall of the locking post 17 is fixedly connected to a pull ring 18, and the side wall of the locking post 17 is fitted with a second spring 19. One end of the second spring 19 is fixedly connected to the side wall of the pull ring 18, and the other end of the second spring 19 is fixedly connected to the side wall of the fixing block 16.
[0037] Ejector rod 14 will wear down over time due to frequent contact and friction with mold 2 and finished product during ejection. When it is necessary to replace ejector rod 14, pull ring 18 is used to move locking pin 17. Pull ring 18 provides an easy-to-operate component for pulling locking pin 17. When locking pin 17 moves, second spring 19 extends. Under normal conditions, second spring 19 is in a compressed state, providing fixing force for locking pin 17. When locking pin 17 moves, second spring 19 extends and stores elastic potential energy. As locking pin 17 moves out of the retaining ring 13, the fixing of connecting pin 15 is released. The retaining ring 13 and connecting pin 15 work together to fix ejector rod 14. When locking pin 17 is inside the retaining ring 13, it can restrict the movement of connecting pin 15, thereby fixing ejector rod 14. When the locking post 17 is removed from the fixing ring 13, the connecting post 15 is no longer fixed. At this time, the connecting post 15 is pulled out of the fixing ring 13, the fixing of the ejector rod 14 is removed, and the ejector rod 14 is taken out and replaced to ensure the normal operation of the ejection action and the quality of the finished product.
[0038] Working principle: When the finished product formed inside the mold 2 is pushed out, the hydraulic cylinder 4 is activated to push the ejector plate 5 to slide on the side wall of the guide rod 1. As the ejector plate 5 moves, the rotating rod 11 rotates and pushes the slider 8 to slide on the side wall of the fixed rod 7, compressing the first spring 9. At the same time, the movement of the slider 8 compresses the damper 10, transmitting the force of the ejector plate 5 to the damper 10. The damper 10 buffers the ejector plate 5 to prevent it from moving too fast and causing damage to the ejector rod 14 when it ejects the finished product.
[0039] The ejector rod 14 will wear out during long-term use. Pulling the pull ring 18 will move the locking pin 17. When the locking pin 17 moves, the second spring 19 will extend. As the locking pin 17 moves out of the fixed ring 13, the fixing of the connecting pin 15 will be released. Then, the connecting pin 15 will be pulled out of the fixed ring 13, the fixing of the ejector rod 14 will be released, and the ejector rod 14 can be removed and replaced.
[0040] 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. An ejector piston structure for an injection molding machine, comprising a guide rod (1), characterized in that: The guide rod (1) has a mold (2) on its side wall, a tail plate (3) is fixedly connected to the side wall of the guide rod (1), a hydraulic cylinder (4) is fixedly connected to the side wall of the tail plate (3), an ejector plate (5) is slidably connected to the side wall of the guide rod (1), the output end of the hydraulic cylinder (4) is connected to the ejector plate (5), a buffer assembly is provided on the side wall of the ejector plate (5), and a fixing assembly is provided on the side wall of the ejector plate (5). The buffer assembly includes a fixed frame (6), the side wall of the fixed frame (6) is fixedly connected to the side wall of the mold (2), a fixed rod (7) is fixedly connected inside the fixed frame (6), a slider (8) is slidably connected to the side wall of the fixed rod (7), a first spring (9) is sleeved on the side wall of the fixed rod (7), a damper (10) is fixedly installed between the fixed frame (6) and the slider (8), a pair of rotating rods (11) are rotatably connected to the side wall of the slider (8), a fixed frame (12) is fixedly connected to the side wall of the ejector plate (5), and the rotating rods (11) are rotatably connected inside the fixed frame (12).
2. The ejector piston structure of an injection molding machine according to claim 1, characterized in that: The fixing component includes a fixing ring (13), the side wall of which is fixedly connected to the side wall of the ejector plate (5), and an ejector rod (14) is slidably connected inside the fixing ring (13).
3. The ejector piston structure of an injection molding machine according to claim 2, characterized in that: The fixing ring (13) is slidably connected to a connecting post (15), which is slidably connected inside the ejector rod (14).
4. The ejector piston structure of an injection molding machine according to claim 3, characterized in that: The fixing ring (13) is fixedly connected to a fixing block (16) on its side wall, and a locking post (17) is slidably connected inside the fixing block (16).
5. The ejector piston structure of an injection molding machine according to claim 4, characterized in that: The locking pin (17) is slidably connected inside the fixing ring (13), the ejector rod (14), and the connecting pin (15).
6. The ejector piston structure of an injection molding machine according to claim 5, characterized in that: A pull ring (18) is fixedly connected to the side wall of the locking post (17), and a second spring (19) is sleeved on the side wall of the locking post (17).
7. The ejector piston structure of an injection molding machine according to claim 6, characterized in that: One end of the second spring (19) is fixedly connected to the side wall of the pull ring (18), and the other end of the second spring (19) is fixedly connected to the side wall of the fixing block (16).
8. The ejector piston structure of an injection molding machine according to claim 1, characterized in that: One end of the first spring (9) is fixedly connected inside the fixed frame (6), and the other end of the first spring (9) is fixedly connected to the side wall of the slider (8).