Injection mold extended ejection stroke device

Abstract

The utility model discloses a kind of injection mould extension ejection stroke devices, including movable mould, the movable mould outside is equipped with fixed mould, the movable mould bottom surface is equipped with fixed plate, and the fixed plate is provided with ejection mechanism, and the ejection mechanism includes push plate and ejector rod, push plate is set on fixed plate top surface, and ejector rod is provided with multiple groups and is slid on movable mould, fixed cylinder is fixedly arranged on fixed plate, the telescopic end of the fixed cylinder is fixedly connected with push plate, and the top surface of push plate is connected with spring, the spring is provided with multiple groups and is fixedly provided with connecting block at top end, quick-mounting mechanism is arranged between multiple connecting blocks and ejector rod, and the quick-mounting mechanism includes fixed sleeve and plug rod, fixed sleeve is fixed on connecting block, plug rod is fixed on ejector rod bottom end and is inserted in fixed sleeve, by quick-release structure, so that ejector rod can be replaced without disassembling entire mould, greatly reduce downtime and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and more specifically, it relates to an injection mold extended ejection stroke device. Background Technology

[0002] In the injection molding process, workpiece ejection is a crucial step in the entire production process, especially in complex or deep-cavity molds. Traditional ejection methods, due to their limited stroke, often fail to eject the plastic part completely, easily leading to workpiece deformation and damage, affecting finished product quality and production efficiency. In practical applications, operators need to intervene multiple times during the ejection process, and even use manual tools to assist in removing the part. This not only increases labor intensity but also reduces the degree of automation. Therefore, how to achieve a longer stroke and a stable and reliable workpiece ejection method has become an important technical requirement for improving injection molding efficiency and finished product quality.

[0003] On the other hand, during mold maintenance and replacement, ejector pins, as important components that come into direct contact with the workpiece, are replaced frequently. However, in traditional structures, ejector pins are usually fixed inside the mold, and their disassembly and assembly process is complicated and cumbersome. It requires disassembling the entire mold structure or using special tools, which is time-consuming and labor-intensive, and can easily lead to misassembly or damage. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides an injection mold extended ejection stroke device to solve the technical problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a device for extending the ejection stroke of an injection mold, comprising a moving mold, a fixed mold on the outer side of the moving mold, a fixed plate on the bottom surface of the moving mold, an ejection mechanism on the fixed plate, the ejection mechanism comprising a push plate and ejector rods, the push plate being disposed on the top surface of the fixed plate, multiple sets of ejector rods being disposed and sliding on the moving mold, a hydraulic cylinder being fixedly disposed on the fixed plate, the telescopic end of the hydraulic cylinder being fixedly connected to the push plate, a spring being connected to the top surface of the push plate, and multiple sets of springs being disposed with their top ends fixedly mounted. There are connecting blocks, and quick-connect mechanisms are provided between multiple sets of connecting blocks and top rods. Each quick-connect mechanism includes a fixed sleeve and an insert rod. The fixed sleeve is fixed to the connecting block, and the insert rod is fixed to the bottom end of the top rod and inserted into the fixed sleeve. A sliding rod is slidably provided on the outer wall of the fixed sleeve. Multiple sets of sliding rods are provided, and each has a locking block fixed at its bottom end. A locking groove is opened on the outer wall of the insert rod. Multiple sets of locking grooves are provided and abut against multiple sets of locking blocks respectively. A limiting sleeve is slidably provided on the outer wall of the fixed sleeve. Push blocks are fixedly provided at the top ends of multiple sets of sliding rods, and the limiting sleeve abuts against the top ends of multiple sets of push blocks.

[0008] The present invention is further configured such that a guide post is fixedly provided between the fixed plate and the moving mold. The guide post is provided in multiple sets and is slidably connected to the push plate, which ensures the smooth movement of the push plate and avoids jamming caused by friction or offset during the ejection process, thereby improving the accuracy and stability of the ejection device.

[0009] The present invention is further configured such that limiting rods are fixedly provided on the bottom surface of multiple sets of connecting blocks, and the multiple sets of limiting rods are slidably connected to the push plate and the fixed plate, which enhances the guiding nature of the ejection mechanism, restricts the excessive movement of the push plate, ensures precise control during the ejection process, and reduces the occurrence of ejection errors.

[0010] The present invention is further configured such that a positioning rod is fixedly provided on the inner wall of the fixed sleeve, and a positioning hole is provided at the top of the insertion rod. Both the positioning rod and the positioning hole are polygonal, which improves the positioning accuracy of the insertion rod and the fixed sleeve, makes the top rod installation more stable, avoids positioning errors, and improves the reliability of the entire device.

[0011] The present invention is further configured such that a rotating sleeve is rotatably mounted on the outer wall of the fixed sleeve, and a mating sleeve is fixedly mounted on the top surface of the limiting sleeve. The outer wall of the mating sleeve is threadedly connected to the inner side of the rotating sleeve, which simplifies the disassembly and installation process of the top rod. The threaded engagement enables precise control of the limiting sleeve, improving the convenience and safety of operation.

[0012] The present invention is further configured such that the outer wall of the fixed sleeve is provided with a movable groove, and the movable groove is provided in multiple sets and is slidably connected to multiple sets of push blocks respectively, which optimizes the sliding path of the push blocks, makes the snap-fit ​​process more stable, avoids the frictional resistance between the snap-fit ​​block and the snap-fit ​​groove, and improves the smoothness of the disassembly and installation of the top rod.

[0013] The present invention is further configured such that tension springs are connected between the top surfaces of multiple sets of locking blocks and the inner wall of the fixing sleeve, which increases the elasticity of the locking blocks, enabling them to be tightly locked in the slots, ensuring the firmness of the top rod after installation, and effectively absorbing external impacts, thus improving the stability of the top rod.

[0014] The present invention is further configured such that the top ends of the multiple sets of push blocks are all arc-shaped, and the bottom end of the limiting sleeve is rounded, which reduces the friction between the push block and the limiting sleeve, improves the smoothness of the contact between the push block and the limiting sleeve, makes the ejection process of the push rod smoother, and avoids wear and malfunctions caused by excessive friction.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a device for extending the ejection stroke of an injection mold, which has the following beneficial effects:

[0017] 1. This device uses a hydraulic cylinder to push the push plate to move, which in turn drives the spring to push the connecting block and the ejector rod to eject the injection molded part. This effectively extends the ejection stroke, ensuring that the workpiece is smoothly ejected in complex molds. It avoids the ejection problem that traditional ejection methods are difficult to achieve in deep cavity molds, significantly improving production efficiency and workpiece quality. Through the reasonable design of the push plate and spring, the ejection action is more stable, avoiding workpiece damage caused by force concentration, and improving the stability and service life of the ejection device.

[0018] 2. The device features a quick-disassembly structure, allowing the ejector pin to be replaced without disassembling the entire mold. This significantly reduces downtime and maintenance costs. By rotating the rotating sleeve and engaging the mating sleeve with threads, the limiting sleeve's contact with the push block is released, and the tension spring causes the locking block to disengage from the slot, thus enabling quick disassembly and installation of the ejector pin. This solves the problem of cumbersome and time-consuming replacement of traditional ejector pins. This design greatly improves the convenience of mold maintenance and the flexibility of the production line, meeting the demands of modern production for high efficiency and reliability.

[0019] 3. During the installation of the top rod, the positioning rod and positioning hole ensure accurate positioning of the top rod, avoiding errors during the installation process. The cooperation between the sliding block and the tension spring ensures the stability of the top rod after installation. Through the interaction of the movable groove and the push block, the locking block can be firmly locked in the groove, ensuring the safety and stability of the top rod during operation. The overall design improves the convenience of top rod installation, reduces the possibility of human error, optimizes the production process, and enhances the adaptability of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an injection mold extension ejection stroke device according to the present invention;

[0021] Figure 2 This is a schematic diagram of the ejection mechanism in this utility model;

[0022] Figure 3 This is a schematic diagram of the disassembly structure of the push rod in this utility model;

[0023] Figure 4 This is a cross-sectional view of the quick-assembly mechanism in this utility model;

[0024] Figure 5 This is a cross-sectional view of the fixing sleeve in this utility model.

[0025] In the diagram: 1. Moving mold; 2. Fixed mold; 3. Fixed plate; 4. Push plate; 5. Ejector rod; 6. Hydraulic cylinder; 7. Spring; 8. Connecting block; 9. Fixed sleeve; 10. Insert rod; 11. Slide rod; 12. Locking block; 13. Locking groove; 14. Limiting sleeve; 15. Push block; 16. Guide post; 17. Limiting rod; 18. Positioning rod; 19. Positioning hole; 20. Rotating sleeve; 21. Mating sleeve; 22. Movable groove; 23. Tension spring. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-5 An extended ejection stroke device for injection molds includes a movable mold 1, a fixed mold 2 on the outer side of the movable mold 1, a fixed plate 3 on the bottom surface of the movable mold 1, and an ejection mechanism on the fixed plate 3. The ejection mechanism includes a push plate 4 and ejector rods 5. The push plate 4 is located on the top surface of the fixed plate 3. Multiple sets of ejector rods 5 slide on the movable mold 1. A hydraulic cylinder 6 is fixedly mounted on the fixed plate 3. The telescopic end of the hydraulic cylinder 6 is fixedly connected to the push plate 4. A spring 7 is connected to the top surface of the push plate 4. Multiple sets of springs 7 are provided, and each has a connecting block 8 fixedly mounted at its top. Each set of connecting blocks 8 is connected to the ejector rod 5. The quick-installation mechanism includes a fixed sleeve 9 and an insertion rod 10. The fixed sleeve 9 is fixed to the connecting block 8, and the insertion rod 10 is fixed to the bottom end of the top rod 5 and inserted into the fixed sleeve 9. The outer wall of the fixed sleeve 9 is provided with a sliding rod 11. Multiple sets of sliding rods 11 are provided, and each of them is fixed with a locking block 12 at its bottom end. The outer wall of the insertion rod 10 is provided with a locking groove 13. Multiple sets of locking grooves 13 are provided and abut against multiple sets of locking blocks 12 respectively. The outer wall of the fixed sleeve 9 is provided with a limiting sleeve 14. Each of the multiple sets of sliding rods 11 is fixed with a push block 15 at its top end, and the limiting sleeve 14 abuts against the top end of the multiple sets of push blocks 15.

[0030] A guide post 16 is fixed between the fixed plate 3 and the moving mold 1. Multiple sets of guide posts 16 are provided and all are slidably connected to the push plate 4. The guide post 16 provides a smooth sliding path for the push plate 4, preventing the push plate 4 from getting stuck due to offset or friction during the ejection process, and ensuring the accuracy and stability of the ejection action.

[0031] Each of the multiple sets of connecting blocks 8 has a fixed limiting rod 17 on its bottom surface. The multiple sets of limiting rods 17 are slidably connected to the push plate 4 and the fixed plate 3. The function of the limiting rod 17 is to limit the movement range of the push plate 4, prevent the push plate 4 from sliding excessively, ensure accurate control during the ejection process, and prevent the push plate 4 from deviating and causing damage.

[0032] A positioning rod 18 is fixedly provided on the inner wall of the fixed sleeve 9, and a positioning hole 19 is provided at the top of the insertion rod 10. Both the positioning rod 18 and the positioning hole 19 are polygonal. The polygonal design of the positioning rod 18 and the positioning hole 19 improves the positioning accuracy of the insertion rod 10 and the fixed sleeve 9, so that the top rod 5 can be accurately positioned, reducing installation instability and potential use problems caused by errors.

[0033] A rotating sleeve 20 is rotatably mounted on the outer wall of the fixed sleeve 9, and a mating sleeve 21 is fixedly mounted on the top surface of the limiting sleeve 14. The outer wall of the mating sleeve 21 is threadedly connected to the inner side of the rotating sleeve 20. Through the threaded connection between the rotating sleeve 20 and the mating sleeve 21, the limiting sleeve 14 can be precisely adjusted and fixed, which simplifies the installation and disassembly process of the top rod 5 and improves the ease of operation and accuracy.

[0034] The outer wall of the fixed sleeve 9 is provided with a movable groove 22. Multiple movable grooves 22 are provided and are slidably connected to multiple sets of push blocks 15 respectively. The sliding connection design between the movable groove 22 and the push block 15 ensures the smooth movement of the push block 15 during the disassembly and installation of the top rod 5, avoids the frictional resistance between the locking block 12 and the locking groove, and improves the smoothness and efficiency of operation.

[0035] Each set of locking blocks 12 is connected to the inner wall of the fixing sleeve 9 by a tension spring 23. The function of the tension spring 23 is to provide elastic force to keep the locking blocks 12 and the inner wall of the fixing sleeve 9 tightly connected, ensuring the firmness of the locking blocks 12 after installation, and effectively absorbing external impact force, thereby enhancing the stability and durability of the top rod 5.

[0036] The tops of multiple push blocks 15 are all set to be arc-shaped, and the bottom of the limiting sleeve 14 is set with rounded corners. The arc-shaped tops of the push blocks 15 and the rounded corners of the limiting sleeve 14 reduce the friction between the push blocks 15 and the limiting sleeve 14, making the ejection process of the push rod 5 smoother, avoiding wear and malfunctions caused by excessive friction, and extending the service life of the equipment.

[0037] In this embodiment, during use, the hydraulic cylinder 6 pushes the push plate 4 to move along multiple sets of guide columns 16. The push plate 4 pushes multiple sets of springs 7, and the multiple sets of springs 7 push the connecting block 8 and the ejector rod 5 to abut against the injection molded part. The push plate 4 squeezes the multiple sets of springs 7, and the multiple sets of springs 7 push the injection molded part to disengage from the moving mold 1. When the ejector rod 5 needs to be replaced, the connecting block 8 is pulled to drive the ejector rod 5 to disengage from the moving mold 1. The rotating sleeve 20 and the mating sleeve 21 are threaded together. The mating sleeve 21 drives the limiting sleeve 14 to release the abutment of the multiple sets of push blocks 15. The multiple sets of tension springs 23 pull the locking block 12 to disengage from the locking groove 13, releasing the locking of the insert rod 10, thus completing the disassembly of the ejector rod 5.

[0038] More specifically, when it is necessary to install the ejector rod 5, slide the ejector rod 5 into the moving mold 1, insert the insert rod 10 into the fixed sleeve 9, and position and insert it through the positioning rod 18 and the positioning hole 19. Then, rotate the rotating sleeve 20 and engage it with the mating sleeve 21 through threaded engagement, so that the mating sleeve 21 pushes the limiting sleeve 14 to abut against the top of the multiple sets of push blocks 15, so that the multiple sets of push blocks 15 slide along the movable groove 22 and push the locking block 12 through the slide rod 11 to engage in the locking groove 13. At the same time, the multiple sets of locking blocks 12 stretch the multiple sets of tension springs 23 respectively, thereby completing the locking of the insert rod 10 and completing the installation of the ejector rod 5.

[0039] In summary, during use or operation of the overall equipment: During use, the hydraulic cylinder 6 pushes the push plate 4 to move along multiple sets of guide columns 16. The push plate 4 pushes multiple sets of springs 7, which in turn push the connecting block 8 to abut against the ejector rod 5 on the injection molded part. The push plate 4 then squeezes the multiple sets of springs 7, which in turn push the injection molded part away from the moving mold 1. When the ejector rod 5 needs to be replaced, the connecting block 8 is pulled to disengage the ejector rod 5 from the moving mold 1. The rotating sleeve 20 engages with the mating sleeve 21 via a threaded connection. The mating sleeve 21 then releases the limiting sleeve 14 from abutting against the multiple sets of push blocks 15. Multiple tension springs 23 pull the locking block 12 away from the locking groove 13, releasing the locking of the insert rod 10, thus completing the disassembly of the ejector rod 5.

[0040] When it is necessary to install the ejector rod 5, slide the ejector rod 5 into the moving mold 1, insert the insert rod 10 into the fixed sleeve 9, and position and insert it through the positioning rod 18 and the positioning hole 19. Then rotate the rotating sleeve 20 and engage it with the mating sleeve 21 through thread, so that the mating sleeve 21 pushes the limiting sleeve 14 to abut against the top of the multiple sets of push blocks 15, so that the multiple sets of push blocks 15 slide along the movable groove 22 and push the locking block 12 through the slide rod 11 to engage in the locking groove 13. At the same time, the multiple sets of locking blocks 12 stretch the multiple sets of tension springs 23 respectively, complete the locking of the insert rod 10, and complete the installation of the ejector rod 5.

[0041] Of all the solutions mentioned above, those involving connections between two components can be selected based on the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other well-known connection methods. These will not be elaborated on here. For all the fixed connections mentioned above, welding is the preferred option.

[0042] In all the solutions mentioned above, the operation of electrical components, unless otherwise specified, is controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and wiring connections are existing, well-known, and mature technologies, and their specific circuit structures will not be described in detail here. The specific models and specifications of the electrical components involved in this solution need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, and therefore will not be described in detail.

[0043] Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies and will not be described in detail in this utility model.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold extended ejection stroke device, comprising a moving mold (1), characterized in that: The moving mold (1) is provided with a fixed mold (2) on its outer side. The bottom surface of the moving mold (1) is provided with a fixed plate (3). The fixed plate (3) is provided with an ejection mechanism, which includes a push plate (4) and an ejector rod (5). The push plate (4) is provided on the top surface of the fixed plate (3). Multiple sets of ejector rods (5) are provided and slide on the moving mold (1). A hydraulic cylinder (6) is fixedly provided on the fixed plate (3). The extension end of the hydraulic cylinder (6) is fixedly connected to the push plate (4). A spring (7) is connected to the top surface of the push plate (4). Multiple sets of springs (7) are provided and each has a connecting block (8) fixedly provided at its top. A quick-connect mechanism is provided between the multiple sets of connecting blocks (8) and the ejector rod (5). The mechanism includes a fixed sleeve (9) and a plug rod (10). The fixed sleeve (9) is fixed on the connecting block (8). The plug rod (10) is fixed at the bottom of the top rod (5) and inserted into the fixed sleeve (9). The outer wall of the fixed sleeve (9) is provided with a sliding rod (11). The sliding rod (11) is provided with multiple sets and each of them is fixed with a locking block (12). The outer wall of the plug rod (10) is provided with a locking groove (13). The locking groove (13) is provided with multiple sets and abuts against multiple sets of locking blocks (12). The outer wall of the fixed sleeve (9) is provided with a limiting sleeve (14). Each of the multiple sets of sliding rods (11) is fixed with a push block (15). The limiting sleeve (14) abuts against the top of the multiple sets of push blocks (15).

2. The injection mold extended ejection stroke device according to claim 1, characterized in that: A guide post (16) is fixed between the fixed plate (3) and the moving mold (1). The guide post (16) is provided in multiple sets and is slidably connected to the push plate (4).

3. The injection mold extended ejection stroke device according to claim 2, characterized in that: Each of the multiple sets of connecting blocks (8) has a fixed limiting rod (17) on its bottom surface, and the multiple sets of limiting rods (17) are slidably connected to the push plate (4) and the fixing plate (3).

4. The injection mold extended ejection stroke device according to claim 3, characterized in that: A positioning rod (18) is fixedly provided on the inner wall of the fixed sleeve (9), and a positioning hole (19) is provided at the top of the insertion rod (10). Both the positioning rod (18) and the positioning hole (19) are polygonal.

5. The injection mold extended ejection stroke device according to claim 4, characterized in that: A rotating sleeve (20) is rotatably installed on the outer wall of the fixed sleeve (9), and a mating sleeve (21) is fixedly installed on the top surface of the limiting sleeve (14). The outer wall of the mating sleeve (21) is threadedly connected to the inner side of the rotating sleeve (20).

6. The injection mold extended ejection stroke device according to claim 5, characterized in that: The outer wall of the fixed sleeve (9) is provided with a movable groove (22), and the movable groove (22) is provided in multiple sets and is slidably connected to multiple sets of push blocks (15).

7. The injection mold extended ejection stroke device according to claim 6, characterized in that: A tension spring (23) is provided between the top surface of the multiple sets of locking blocks (12) and the inner wall of the fixing sleeve (9).

8. The injection mold extended ejection stroke device according to claim 7, characterized in that: The top of each of the multiple push blocks (15) is rounded, and the bottom of the limiting sleeve (14) is rounded.

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