Injection mold for feeding glue in narrow space
By using a submerged gate runner and a side slider design, the problem of gate marks caused by gating in narrow spaces is solved, resulting in aesthetically pleasing plastic products and a simple mold structure, while reducing production costs.
Patent Information
- Application Number
- CN202520075490.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Existing injection molds, when used in confined spaces, result in gate marks that affect the appearance of plastic products, and the complex mold structure increases production costs.
The submerged gate runner design introduces the molten plastic into the cavity between the side cores through the submerged gate runner on the rear mold core, forming a gate mark located on the inside of the plastic product. Combined with the side slider and drive mechanism, this results in a product with an aesthetically pleasing appearance and simple structure.
Concealing gate marks inside plastic products improves product quality, reduces the cost of manually handling defects, simplifies mold structure, and lowers manufacturing costs.
Smart Images
Figure CN223834968U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold for injecting glue in a narrow space. Background Technology
[0002] Injection molds are specialized tools for producing plastic products. They typically consist of two main parts: a front mold (also called a fixed mold) and a rear mold (also called a moving mold). Molten plastic is injected into the mold cavity under pressure, and after cooling and solidification, a plastic product with a specific shape and dimensional accuracy is formed. For example... Figure 1 As shown, for plastic shell products with several narrow through-holes on their surface, to avoid gate marks affecting the main appearance of the product, the gate of the injection mold cannot be located on the main appearance surface of the product. Using an inverted mold to inject material from the inside of the plastic shell product leads to problems such as longer sprue material and more complex molds. Therefore, there is an urgent need for an injection mold designed for injection into confined spaces. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide an injection mold for injecting plastic in a narrow space, so that the plastic product has a natural and beautiful appearance and reduces production costs.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] An injection mold for injection in a confined space includes a front mold and a rear mold. The front mold includes a front mold core with a front mold cavity at the center of its bottom for molding the top structure of the product. Several front mold cores with narrow through-holes for molding the top of the product are spaced apart within the front mold cavity. The front mold cores protrude from the bottom surface of the front mold cavity. Multiple transverse runners are staggered on the top of the front mold core, and multiple longitudinal runners are located below the transverse runners. One end of each longitudinal runner communicates with a transverse runner, and the other end penetrates downwards through one of the front mold cores. The rear mold includes... There is a rear mold core, and a rear mold core is provided at the top center of the rear mold core for contacting the front mold core. Multiple side sliders are slidably provided around the rear mold core. The side sliders cooperate with the rear mold core to form the side structure of the product. Several side cores are provided at intervals on the side sliders for forming the narrow through holes on the side of the product. The rear mold core is provided with multiple submarine gate runners corresponding to the longitudinal runners. One end of the submarine gate runner is connected to the longitudinal runners, and the other end obliquely penetrates the side wall of the rear mold core and is connected to the cavity between the side cores.
[0006] As a further explanation of the above technical solution:
[0007] The submersible gate runner is shaped like a cow's horn.
[0008] Each lateral slider is connected to a lateral drive mechanism, which is used to drive the lateral slider to move closer to or further away from the model core.
[0009] Several ejector pins are inserted at intervals on the rear model core.
[0010] The front mold core has four front tiger mouths at the bottom corners; the rear mold core has four rear tiger mouths at the top corners for engaging with the front tiger mouths.
[0011] Compared with the prior art, this utility model achieves at least the following beneficial effects:
[0012] When the front and rear molds of this invention are closed, the rear mold core and the front mold core make contact with each other. The molten plastic enters the main runner from the nozzle of the injection molding machine, passes through the transverse and longitudinal runners, and then enters the cavity between the side cores through the submerged gate runner. After cooling and solidification, it forms a plastic product. The front mold cavity and the rear mold core cooperate to form the top structure of the product, and the side slide cooperates with the rear mold core to form the side structure of the product. Since the submerged gate runner is located on the rear mold core, the gate mark is located on the inner side of the plastic product and is hidden, which does not affect the main appearance of the product, improves product quality, saves labor costs for dealing with product defects, and the injection mold structure of this invention is simple, reducing mold manufacturing costs. Attached Figure Description
[0013] One or more embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which:
[0014] Figure 1 This is a structural diagram of a plastic product;
[0015] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0016] Figure 3 This is an exploded view of an embodiment of the present utility model;
[0017] Figure 4 This is an exploded view from another perspective of an embodiment of the present utility model;
[0018] Figure 5 This is a schematic diagram of the structure of the front mold core in an embodiment of the present invention;
[0019] Figure 6 This is a schematic diagram of the structure of the rear mold core according to an embodiment of the present utility model;
[0020] Figure 7 This is a top view of the front mold core and the rear mold core according to an embodiment of the present utility model;
[0021] Figure 8 for Figure 7AA sectional view.
[0022] The numbers in the diagram are: 1. Front mold core; 11. Horizontal runner; 12. Vertical runner; 13. Front sprue; 2. Front mold cavity; 3. Front mold core; 4. Rear mold core; 41. Rear sprue; 5. Rear mold core; 51. Submersible gate runner; 6. Side slider; 7. Side core; 8. Ejector pin; 9. Plastic product. Detailed Implementation
[0023] The present invention will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of this application more complete and to fully convey the concept of the present application to those skilled in the art.
[0024] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0025] like Figures 2-8As shown, an injection mold for injection into a confined space includes a front mold and a rear mold. The front mold includes a front mold core 1, with a front mold cavity 2 at the center of its bottom for molding the top structure of the product. Several front mold cores 3, spaced apart within the front mold cavity 2, are used to mold the top of the product through holes. The front mold cores 3 protrude from the bottom surface of the front mold cavity 2. Multiple transverse runners 11 are staggered on the top of the front mold core 1, and multiple longitudinal runners 12 are located below the transverse runners 11. One end of each longitudinal runner 12 connects to one of the transverse runners 11, and the other end extends downward through one of the front mold cores 3. The rear mold includes... The mold includes a rear mold core 4, and a rear mold core 5 is provided at the top center of the rear mold core 4 for contacting the front mold core 3. Multiple side sliders 6 are slidably provided around the rear mold core 5. The side sliders 6 cooperate with the rear mold core 5 to form the side structure of the product. Several side cores 7 are provided on the side sliders 6 at intervals for forming the narrow through holes on the side of the product. Multiple submarine gate runners 51 are provided on the rear mold core 5, corresponding to the longitudinal runners 12. One end of the submarine gate runner 51 is connected to the longitudinal runners 12, and the other end obliquely penetrates the side wall of the rear mold core 5 and is connected to the cavity between the side cores 7.
[0026] When the front and rear molds of this invention are closed, the rear mold core 5 and the front mold core 3 make contact with each other. The molten plastic enters the main runner from the nozzle of the injection molding machine, passes through the transverse runner 11 and the longitudinal runner 12, and then enters the cavity between the side cores 7 through the submersible gate runner 51. After cooling and solidification, it forms a plastic product 9. The front mold cavity 2 and the rear mold core 5 are used to form the top structure of the product, and the side slide 6 is used to form the side structure of the product. Since the submersible gate runner 51 is located on the rear mold core 5, the gate mark is located on the inner side of the plastic product 9 and is hidden, which does not affect the main appearance of the product, improves the product quality, saves the labor cost of dealing with product defects, and the injection mold structure of this invention is simple, reducing the mold manufacturing cost.
[0027] Preferably, the submerged gate channel 51 is horn-shaped.
[0028] In some embodiments of this utility model, each lateral slider 6 is connected to a lateral drive mechanism (not shown in the figures). When the front mold and the rear mold are closed, the lateral drive mechanism is used to drive the lateral slider 6 to move closer to the rear mold core 5, so that the lateral slider 6 can cooperate with the rear mold core 5 to form the side structure of the product. When the front mold and the rear mold are opened, the lateral drive mechanism is used to drive the lateral slider 6 to move away from the rear mold core 5, so as to pull the side core 7 out from the side of the plastic product 9, so that the plastic product 9 can be easily demolded after the main parting surface is opened, ensuring the quality of the plastic product 9.
[0029] In some embodiments of this utility model, a plurality of ejector pins 8 are inserted at intervals on the rear mold core 5. When the front mold and the rear mold are opened, after the plastic product 9 is opened on the main parting surface, the ejector pins 8 can eject the plastic product 9 from the rear mold core 5.
[0030] In some embodiments of this utility model, the four bottom corners of the front mold core 1 are provided with front slots 13, and the four top corners of the rear mold core 4 are provided with rear slots 41 that match the positioning grooves. When the front mold and the rear mold are closed, the front slots 13 at the four corners of the front mold core 1 and the rear slots 41 at the four corners of the rear mold core 4 are inserted to achieve positioning calibration, thereby ensuring the quality and precision of the plastic product 9.
[0031] In some embodiments of this utility model, the front mold cavity 2 is in the shape of a circular groove, and the front mold core 3 is arranged radially with the center of the front mold cavity 2 as the center, thereby forming small through holes arranged radially on the top of the product.
[0032] It should be understood that all the above embodiments are exemplary and not restrictive. Any modifications, equivalent changes and alterations made by those skilled in the art to the specific embodiments described above under the concept of this utility model shall still fall within the scope of the technical solution of this utility model.
Claims
1. An injection mold for injection into a confined space, comprising a front mold and a rear mold, characterized in that: The front mold includes a front mold core, and the bottom center of the front mold core is provided with a front mold cavity for molding the top structure of the product. The front mold cavity is provided with a number of front mold cores for molding the narrow through holes on the top of the product. The front mold cores protrude from the bottom surface of the front mold cavity. The top of the front mold core is provided with a number of transverse flow channels. Below the transverse flow channels are a number of longitudinal flow channels. One end of each longitudinal flow channel is connected to the transverse flow channel, and the other end penetrates downward through one of the front mold cores. The rear mold includes a rear mold core, and a rear mold core is provided at the top center of the rear mold core for contacting the front mold core. Multiple side sliders are slidably arranged around the rear mold core. The side sliders cooperate with the rear mold core to form the side structure of the product. Several side cores are provided at intervals on the side sliders for forming small through holes on the side of the product. The rear mold core is provided with multiple submarine gate runners corresponding to the longitudinal runners. One end of the submarine gate runner is connected to the longitudinal runners, and the other end obliquely penetrates the side wall of the rear mold core and is connected to the cavity between the side cores.
2. The injection mold for injection into a confined space according to claim 1, characterized in that: The submerged gate runner is horn-shaped.
3. The injection mold for injection into a confined space according to claim 1, characterized in that: Each of the lateral sliders is connected to a lateral drive mechanism, which is used to drive the lateral slider to move closer to or away from the rear model core.
4. The injection mold for injection into a confined space according to claim 1, characterized in that: The rear model core is provided with several pins inserted at intervals.
5. The injection mold for injection into a confined space according to claim 1, characterized in that: The front mold core has front tiger mouths at the four bottom corners; the rear mold core has rear tiger mouths at the four top corners for engaging with the front tiger mouths.