Ejector block structure without spring resetting on inclined ejector
By designing a combination structure of inclined grooves and direct grooves on the inclined top, the ejection without spring return is achieved by using the combination of the elastic block and the pressing block, the problem of diagonal top demolding and failure of the spring return mechanism is solved, and reliable mold release on a small-thick oblique top is achieved.
Patent Information
- Application Number
- CN202422600952.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-10-28
AI Technical Summary
The existing oblique top structure easily causes the product to stick to the oblique top when demolding, and the traditional spring return mechanism is unusable on oblique tops with smaller thickness and is prone to failure.
The top block structure without spring reset is adopted. Through the combination of bevel grooves and direct grooves, the secondary ejection of the product is achieved by combining the elastic grooves and the pressing blocks to avoid the use of springs.
It achieves successful mold release on the oblique top with a smaller thickness, avoiding the space limitations of the spring return mechanism and the risk of multiple compression failures, and the structure is simple and reliable.
Smart Images
Figure CN223252274U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of molds, in particular to a top block structure on an inclined top that does not require spring reset. Background Art
[0002] The ejector is a very common component in injection molds that solves the problem of undercut release. The ejector is fixed to the ejector plate and ejects the product along with it, retreating to release the undercut as it ejects. Often, the glue area on the ejector, due to deep ribs or cylindrical bosses, creates a strong holding force on the product. As the ejector retreats, the product can become stuck to the ejector, causing the product to deform and prevent proper release from the undercut. To prevent this, a secondary ejector mechanism is required. In mold design, a commonly used mechanism is to incorporate a dome ejector pin inside the ejector. After ejection, the ejector pin is typically reset using a spring. Since the maximum compression ratio of the commonly used blue spring is 40%, for example, with an ejector pin travel of 3mm and a preload design of 5mm, the actual maximum compression is 8mm, requiring a spring length of 20mm (20*0.4=8). The combined effect of the spring hole depth, the minimum distance between the spring and the adhesive surface, the ejector cup thickness, and the ejector block thickness means that this spring-return internal ejection mechanism requires a tight clearance in the direction of the ejector's thickness. This makes it suitable only for relatively thick ejectors, and there's also the risk of spring failure after repeated compression. Utility Model Content
[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a top block structure on an inclined top that does not require a spring to reset, so as to solve the technical problems raised in the above-mentioned background technology.
[0004] The purpose of this utility model is achieved through the following technical solutions:
[0005] A top block structure on an inclined roof that does not require spring reset includes a rear mold and a mold core arranged on the rear mold, the mold core is provided with an inclined groove, the inclined roof is fitted in the inclined groove, the inclined roof is provided with a mounting groove running through both sides of the inclined roof, a spring block is movably installed in the mounting groove, the spring block is provided with a protruding protrusion flush with the outer extension of the inclined roof, straight grooves arranged in the vertical direction are provided on the inner walls on the left and right sides of the inclined groove, and the spring block is vertically installed in the mounting groove of the inclined roof through the straight groove.
[0006] In the above utility model, further, a limiting protrusion is provided on the top of the elastic block, and a limiting groove cooperating with the limiting protrusion is provided on the top of the mounting groove.
[0007] In the above utility model, further, a pressing block is fixedly installed on the inclined top through a pin, and the pressing block abuts against the outer wall of the limiting protrusion.
[0008] In the above utility model, further, the end of the ejection protrusion cooperates with the undercut portion of the injection molded product.
[0009] The beneficial effects of the utility model are:
[0010] The ejector block structure provided by the utility model can be used on an inclined ejector with a smaller thickness. When the product is ejected for the second time by inverting the buckle, no spring is required for reset. This overcomes the disadvantage that the traditional secondary ejection mechanism using spring reset cannot be used on an inclined ejector with a smaller thickness, and also avoids the risk of failure of the spring of the traditional secondary ejection mechanism after multiple compressions. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural diagram of the utility model;
[0012] Figure 2 This is a schematic diagram of the mold core structure of the utility model;
[0013] Figure 3 for Figure 1 A partial enlarged view of part A;
[0014] Figure 4 This is a schematic diagram of the inclined roof structure of the utility model;
[0015] Figure 5 This is a schematic diagram of the connection structure between the inclined roof and the elastic block of the utility model;
[0016] Figure 6 Schematic diagram of the ejection structure of the utility model
[0017] In the figure, 100-rear mold, 200-mold core, 300-oblique ejector, 400-spring block, 500-pressing block, 600-injection molded product, 201-oblique groove, 202-straight groove, 301-installation groove, 302-limiting groove, 401-ejection protrusion, 402-limiting protrusion. DETAILED DESCRIPTION
[0018] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.
[0019] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.
[0020] Example:
[0021] A top block structure on an inclined top that does not require spring reset, see attached Figure 1 As shown, it includes a rear mold 100 and a mold core 200 disposed on the rear mold 100. Figure 2 As shown, the core 200 is provided with an inclined groove 201. Figure 3 As shown, the inclined groove 201 is matched with an inclined top 300, and further reference is made to the attached drawings. Figure 4 and attached Figure 5 As shown, the inclined top 300 is provided with a mounting groove 301 that passes through both sides of the inclined top, and the elastic block 400 is movably mounted in the mounting groove 301. Figure 3 As shown, the spring block 400 is provided with a protruding portion 401 that is flush with the outer extension of the inclined top 300. Figure 2 As shown, the inner walls of the inclined groove 201 are provided with vertically arranged straight grooves 202, and the spring block 400 is vertically installed in the installation groove 301 of the inclined ejector 300 through the straight grooves 202. The end of the ejector protrusion 401 cooperates with the undercut portion of the injection molded product 600.
[0022] This utility is specifically in the working process, please refer to the attached Figure 3 Shown and attached Figure 6 As shown, when the mold is opened, the lifter 300 moves upward under the guidance of the inclined groove 201 of the core 200 and produces displacement in the X direction. Simultaneously, the spring block 400 moves upward, driven by the lifter. Due to the guidance of the straight groove 202, the spring block 400 only moves in the Y direction and does not displace in the X direction. The spring block 400 moves in the opposite direction of the X direction relative to the lifter 300, thereby ejecting the undercut portion of the injection molded product 600 attached to the surface of the lifter 300. This disengages the undercut portion from the lifter 300 surface, allowing the undercut portion of the injection molded product 600 to smoothly detach from the lifter, preventing sticking and deformation during demolding. When the mold is closed, the lifter 300 can directly drive the spring block 400 to move in the negative Y direction and reset. No spring is required during the reset process, resulting in a simple structure and overcoming the disadvantage of the traditional secondary ejection structure that uses spring reset, resulting in a thicker lifter design. Therefore, the ejection structure of the present invention can be used on a sloping roof with a smaller thickness.
[0023] In the above embodiment, please refer to the attached Figure 3 As shown, preferably, a limiting protrusion 402 is provided on the top of the spring block 400, and a limiting groove 302 is provided on the top of the mounting groove 301 to cooperate with the limiting protrusion 402. The cooperation between the limiting protrusion 402 and the limiting groove 302 can limit the ejection distance of the spring block 400, preventing the spring block 400 from being ejected too far and causing undercut deformation of the injection molded product 600. Secondly, a pressure block 500 is fixed to the inclined ejector 300 via a pin. The pressure block 500 abuts against the outer wall of the limiting protrusion 402 to prevent the spring block 400 from falling off the inclined ejector 300.
[0024] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.
Claims
1. A top block structure on an inclined top that does not require spring return, comprising a rear mold and a mold core arranged on the rear mold, characterized in that: The mold core is provided with an inclined groove, and an inclined top is matched in the inclined groove. The inclined top is provided with a mounting groove that runs through both sides of the inclined top. A spring block is movably installed in the mounting groove, and the spring block is provided with a protruding protrusion that is flush with the outer extension of the inclined top. Straight grooves arranged in the vertical direction are provided on the inner walls on the left and right sides of the inclined groove, and the spring block is vertically installed in the mounting groove of the inclined top through the straight groove.
2. A top block structure on an inclined top that does not require spring return according to claim 1, characterized in that: A limiting convex portion is provided on the top of the elastic block, and a limiting groove matched with the limiting convex portion is provided on the top of the mounting groove.
3. A top block structure on an inclined top that does not require spring return according to claim 2, characterized in that: A pressing block is fixedly mounted on the inclined top through a pin, and the pressing block abuts against the outer wall of the limiting protrusion.
4. The top block structure on the inclined roof without spring return according to claim 1, characterized in that: The end of the ejection protrusion cooperates with the undercut portion of the injection molded product.