Ejection force reinforcing structure based on small ejector blocks

Abstract

The utility model relates to a kind of ejection force reinforcing structure based on small elastic block, belongs to injection mould technical field, including injection mould, the injection mould is equipped with injection product, the injection product side lower end is equipped with ejection elastic block subassembly with injection mould interval.The ejection elastic block subassembly includes elastic block, the elastic block is equipped with the isohypse screw extending out the lower end of elastic block, the isohypse screw and the elastic block are equipped with the boss with isohypse screw hole type screw thread sleeve joint, the lower part of the elastic block and isohypse screw are equipped with the spring with isohypse screw sleeve joint.It has the characteristics of simple structure, good effect and high running stability.Through ejection elastic block subassembly, more powerful, more stable ejection force is provided in limited space, the powerful, stable, accurate ejection to difficult demoulding product is realized, while ensuring the accuracy of ejection action and the long life of mould.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an ejection force enhancement structure based on a small spring block. Background Technology

[0002] When a product sticks to the front mold, an additional front mold ejection structure is usually required. Using a front mold ejector plate is costly due to its complexity. Therefore, current molds typically use small spring-loaded structures to assist ejection. However, these small spring-loaded structures have relatively low ejection force, making it difficult to eject the product smoothly when it is severely stuck to the mold.

[0003] Currently, to prevent the ejector block from rotating after ejection, it typically has two upright and two angled sides, resulting in significant friction during ejection. Furthermore, the current ejector block structure has relatively low ejection force, making it difficult to eject products that are severely stuck to the mold. Summary of the Invention

[0004] This invention primarily addresses the shortcomings of existing technologies by providing an ejection force enhancement structure based on small ejector blocks. This structure is characterized by its simple structure, excellent performance, and high operational stability. It solves the demolding problem of complex injection-molded products. Through the ejector block assembly, within a limited space, it provides a stronger and more stable ejection force for specific types of injection-molded products, especially those with deep cavities, reinforcing ribs, or undercuts on the sidewalls, which can easily lead to vacuum suction or excessive clamping force during ejection. This achieves powerful, stable, and precise ejection of difficult-to-demold products, while ensuring the accuracy of the ejection action and the long lifespan of the mold.

[0005] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions: An ejection force enhancement structure based on a small spring block includes an injection mold, within which an injection-molded product is disposed. An ejection spring block assembly is disposed between the lower end of one side of the injection-molded product and the injection mold. The ejection spring block assembly includes a spring block, on which a height-equalizing screw extends from the lower end of the spring block. A boss is provided between the height-equalizing screw and the spring block, engaging with the height-equalizing screw via a countersunk thread. A spring is provided between the lower part of the spring block and the height-equalizing screw, engaging with the height-equalizing screw.

[0006] At the start of the ejection process, the pre-stored energy of the spring is released instantaneously, providing a "launching" assist force to help the ejector block start quickly and overcome the initial static friction of the product. After the ejection process is completed, the ejector plate retracts, and the spring force pushes the ejector block downwards, ensuring its complete and reliable reset and preventing damage to the mold or product during the next mold closing due to jamming. During ejection and reset, the spring absorbs a certain amount of impact and vibration, making the movement of the entire mechanism smoother and reducing noise and wear.

[0007] Preferably, guide strips are provided on both sides of the spring block, and several screws are provided on the guide strips through countersunk holes and threadedly connected to the spring block. The guide strips provide precise guidance for the up-and-down linear movement of the spring block, preventing it from deflecting, tilting, or jamming due to uneven force during ejection.

[0008] Preferably, the guide bar is made of bronze. Bronze is an excellent bearing material with excellent wear resistance, ensuring guiding accuracy and service life during long-term, high-frequency frictional movements. Bronze contains certain lubricating components (such as lead), maintaining good working condition even in the absence of oil or with poor lubrication, thus reducing the coefficient of friction. Compared to direct friction between steels, bronze absorbs vibration better, resulting in smoother movement.

[0009] Preferably, the boss and the spring block are integrated into a trapezoidal columnar structure.

[0010] Preferably, the upper surface of the boss is higher than the upper surface of the equal-height screw.

[0011] Preferably, the upper four sides of the spring block have a sloping structure of 3 to 5 degrees.

[0012] This invention can achieve the following effects: This invention provides an ejection force enhancement structure based on small ejector blocks, which, compared with existing technologies, features a simple structure, good performance, and high operational stability. It solves the demolding problem of complex injection molded products. Through the ejector block assembly, within a limited space, it provides a stronger and more stable ejection force for specific types of injection molded products, especially those with deep cavities, reinforcing ribs, or undercuts on the sidewalls, which easily lead to vacuum suction or excessive clamping force during ejection. This achieves powerful, stable, and precise ejection of difficult-to-demold products, while ensuring the accuracy of the ejection action and the long lifespan of the mold.

[0013] Significantly enhanced ejection force: By combining "equal height screws + springs", the mechanical ejection and elastic assisted ejection are superimposed, effectively overcoming the huge clamping force generated by the product due to deep cavity, undercut, etc.

[0014] Excellent demolding effect: The inclined surface design at the top of the spring block is the finishing touch. By reducing friction and generating wedge force, it cleverly solves the two major demolding problems of "vacuum adsorption" and "lateral jamming", effectively preventing the product from whitening and deformation.

[0015] High motion precision and strong stability: The combination of bronze guide bars and countersunk screws ensures the precise guidance and stability of spring block 4 in high-speed reciprocating motion, avoiding uneven wear and jamming, and greatly improving the reliability and life of the mold.

[0016] Compact structure and high integration: The integrated trapezoidal design of the boss and spring block highly integrates functions such as power transmission, spring installation and structural reinforcement, enabling the entire component to achieve powerful functions in a small mold space, with a compact and robust structure.

[0017] Easy maintenance and long service life: The guide bar is made of wear-resistant, self-lubricating bronze and is fixed with screws, making it easy to replace after wear. The overall structural design is reasonable, with balanced force distribution, extending the service life of the entire ejection mechanism. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 3 This is a structural cross-sectional view of the present invention.

[0021] In the diagram: 1. Injection molded product; 2. Injection mold; 3. Ejector spring assembly; 4. Spring; 5. Equal height screw; 6. Boss; 7. Guide bar; 8. Screw; 9. Spring. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0023] Example: Figure 1 , Figure 2 and Figure 3 As shown, an ejection force enhancement structure based on a small spring block includes an injection mold 2, within which an injection molded product 1 is disposed. An ejection spring block assembly 3 is disposed between the lower end of one side of the injection molded product 1 and the injection mold 2. The ejection spring block assembly 3 includes a spring block 4, the upper four sides of which are inclined at a 3-degree angle. A height-equalizing screw 5 extends from the lower end of the spring block 4. A boss 6, which is countersunk and threadedly connected to the height-equalizing screw 5, is disposed between the height-equalizing screw 5 and the spring block 4. The boss 6 and the spring block 4 form an integrated trapezoidal columnar structure, with the upper end face of the boss 6 being higher than the upper end face of the height-equalizing screw 5. A spring 9, which is sleeved between the lower part of the spring block 4 and the height-equalizing screw 5, is disposed therewith. Guide strips 7, made of bronze, are provided on both sides of the spring block 4. Two screws 8, which are countersunk through the guide strips 7 and threadedly fixed to the spring block 4, are disposed on the guide strips 7.

[0024] The workflow is as follows: Mold closing and injection molding: The mold closes, and the injection molded product 1 is formed in the cavity. At this time, the spring block 4 is in its lowest initial position under the preload of the spring 9 and its own weight.

[0025] Mold opening: The moving mold part moves backward and separates from the fixed mold, and product 1 moves together with the moving mold part (including spring block 4).

[0026] Ejection start: The ejector rod of the injection molding machine pushes the ejector plate of the mold, and the ejector plate starts to push the spring block 4 upward through the equal height screw 5.

[0027] Assisted demolding: The spring block 4 begins to move upward, and its 3-degree inclined surface at the top first contacts the product 1. The elastic force of the spring 9 is released instantaneously, providing auxiliary ejection force. At the same time, the wedge effect of the inclined surface generates an outward component force, helping the product 1 to detach from the cavity sidewall.

[0028] Smooth ejection: With the precise cooperation between the guide bar 7 and the mold guide groove, the spring block 4 moves vertically and smoothly upward until the equal height screw 5 reaches its preset upper limit of stroke, completely ejecting the product 1.

[0029] Reset: The ejector plate retracts under the action of the injection molding machine pull rod or reset rod, and the equalizing screw 5 descends accordingly. The elastic force of the spring 9 pushes the spring block 4, causing it to slide precisely along the guide groove together with the guide strip 7, fully resetting to the initial position, preparing for the next injection cycle.

[0030] In summary, this ejection force enhancement structure based on small ejector blocks features simple structure, good performance, and high operational stability. It solves the demolding problem of complex injection molded products. Through the ejector block assembly, within a limited space, it provides a stronger and more stable ejection force for specific types of injection molded products, especially those with deep cavities, reinforcing ribs, or undercuts on the sidewalls, which easily lead to vacuum suction or excessive clamping force during ejection. This achieves powerful, stable, and precise ejection of difficult-to-demold products, while ensuring the accuracy of the ejection action and the long life of the mold.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A force-enhancing structure based on a small spring block, comprising an injection mold (2), characterized in that: The injection mold (2) contains an injection molded product (1), and an ejector spring assembly (3) is provided between the lower end of one side of the injection molded product (1) and the injection mold (2). The ejector spring assembly (3) includes a spring block (4), and a height-equalizing screw (5) extending from the lower end of the spring block (4) is provided on the spring block (4). A boss (6) is provided between the height-equalizing screw (5) and the spring block (4) and is engaged with the height-equalizing screw (5) by a countersunk thread. A spring (9) is provided between the lower part of the spring block (4) and the height-equalizing screw (5) and is engaged with the height-equalizing screw (5).

2. The ejection force strengthening structure based on small elastic blocks according to claim 1, characterized in that: The spring block (4) is provided with guide strips (7) on both sides. The guide strips (7) are provided with a number of screws (8) that are countersunk through the guide strips (7) and threadedly connected to the spring block (4).

3. The ejection force strengthening structure based on small elastic blocks according to claim 2, characterized in that: The guide bar (7) is made of bronze.

4. The ejection force strengthening structure based on small elastic blocks according to claim 1, characterized in that: The protrusion (6) and the spring block (4) are integrated into a trapezoidal columnar structure.

5. The ejection force strengthening structure based on small spring blocks according to claim 4, characterized in that: The upper surface of the boss (6) is higher than the upper surface of the equal-height screw (5).

6. The push-out force strengthening structure based on small elastic blocks according to claim 1, characterized in that: The upper four sides of the aforementioned spring block (4) are inclined surfaces with a degree of 3 to 5 degrees.

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