Multi-channel feeding injection mold structure for injection molding part with inclined surface structure

Abstract

The utility model discloses a multi -channel glue -feeding injection mold structure to the injection mold structure with slope structure injection part relates to injection mold technical field, and the utility model discloses including lower mould base, the upper portion of lower mould base is equipped with upper mould base, and the middle part of upper mould base is equipped with porous injection mechanism, is used for conveying raw materials when injection molding, and the porous injection mechanism includes: glue -feeding subassembly includes the sealing plate of setting on the upper portion of upper mould base, and the middle part of sealing plate is equipped with the glue -feeding mouth, and the top middle part of upper mould base is equipped with the central cavity, and the top of upper mould base is equipped with four with the intercommunication of center cavity's flow guide chamber, and the top of upper mould base is equipped with annular chamber, and annular chamber and flow guide chamber intercommunication, and the application passes through setting central cavity, flow guide chamber, annular chamber and injection chamber back, makes injection raw material can be through multiple injection chamber even and uniform speed raw material input to the cavity in, to can effectively reduce the slope part bubble, the defect such as welding mark.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a multi-channel injection mold structure for injection molded parts with inclined surface structures. Background Technology

[0002] The use of injection molds involves injecting hot-melt plastic material into the mold cavity, where it cools and solidifies to form the desired shape and structure.

[0003] Reference patent document: Patent publication number CN219505344U, patent publication date 2023-08-11, discloses a slanted ejector injection mold structure for injection molding of grid-like products, solving the technical problem of leaving marks on the product surface after shearing material after injection molding using traditional molds. It includes a slanted ejector block, a slanted ejector rod, a slanted ejector slide, and a main runner. The slanted ejector block is located at the upper end of the slanted ejector rod. The slanted ejector slide has a slanted cutting surface that is higher on the left and lower on the right. The lower end of the slanted ejector rod rests on the slanted ejector... On the inclined cutting surface of the top slide block, the main runner is located in the fixed mold, and its gate is connected to the injection molding machine. The upper surface of the inclined ejector block is provided with a first runner and a second runner. When the fixed mold and the moving mold are closed, the gate of the first runner is connected to the main runner, the gate of the second runner is connected to the outlet of the first runner, and the outlet of the second runner is connected to the mold cavity. The position where the second runner is connected to the mold cavity is located at a position on the non-appearance surface of the product, so that the shearing material will not leave traces on the appearance surface after the product is demolded.

[0004] Based on the search of patent numbers and the shortcomings of existing technologies, the following was found:

[0005] Traditionally, when injection molding parts with sloping structures, using a single-point injection mold often results in defects such as flow marks, weld lines, bubbles, and localized underfilling due to excessively long melt flow and uneven filling, which seriously affects the appearance quality of the parts. While some multi-point injection methods are used, it is still difficult to balance the pressure in each runner, especially for deep cavity sloping structures, which is prone to causing local stress concentration and warping deformation.

[0006] Therefore, this utility model provides a multi-channel injection mold structure for injection molded parts with inclined surface structures. Utility Model Content

[0007] To address the common problems of traditional injection molding for inclined structures, such as excessively long single-point injection flow leading to filling defects, or uneven flow channel pressure due to multi-point injection making it difficult to adapt to deep cavities and inclined surfaces, which can easily cause stress concentration and warping, this invention aims to provide a multi-channel injection mold structure for injection molded parts with inclined structures.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A multi-channel injection mold structure for injection molded parts with inclined surfaces includes a lower mold base, an upper mold base at the upper part of the lower mold base, and a multi-hole injection mechanism in the middle of the upper mold base for conveying raw materials during injection. The multi-hole injection mechanism includes:

[0009] The injection assembly includes a sealing plate disposed on the upper part of the upper mold base, an injection port in the middle of the sealing plate, a central cavity in the middle of the top of the upper mold base, four guide cavities communicating with the central cavity in the top of the upper mold base, an annular cavity in the top of the upper mold base communicating with the guide cavities, and multiple injection cavities communicating with the annular cavity in the middle of the upper mold base. Bolts are slidably secured at the four corners of the sealing plate.

[0010] The ejector assembly, located in the middle of the upper mold base, is used to eject the remaining injection molding material from the central cavity, guide cavity, annular cavity, and injection cavity.

[0011] Preferably, the push assembly includes a cylinder fixedly installed on the upper part of the upper mold base, and a push plate is fixedly installed on the drive end of the cylinder.

[0012] Preferably, the upper mold base has an installation groove at the top center, and the sealing plate is slidably engaged in the middle of the installation groove to ensure a sealed connection with the upper mold base.

[0013] Preferably, the upper part of the upper mold base has multiple evenly distributed threaded grooves, and the lower parts of multiple bolts are threadedly installed in the middle of the threaded grooves.

[0014] Preferably, two symmetrically distributed positioning blocks are fixedly installed at the bottom of the sealing plate, and two positioning grooves are opened on the upper part of the upper mold base to cooperate with the positioning blocks to position the sealing plate.

[0015] Preferably, the upper mold base has a slot in the middle, and the push plate is slidably locked in the slot to ensure that the push plate is flush with the lower surface of the central cavity.

[0016] Beneficial effects

[0017] This invention provides a multi-channel injection mold structure for injection molded parts with inclined surface structures. Compared with the prior art, it has the following advantages:

[0018] 1. By setting up a central cavity, a guide cavity, an annular cavity, and an injection cavity, this application enables the injection molding material to be uniformly and at a constant speed fed into the mold cavity through multiple injection cavities, thereby effectively reducing defects such as bubbles and weld lines on the inclined surface.

[0019] 2. This application uses bolts to install the upper sealing plate, which allows for quick disassembly and installation. This facilitates the cleaning of residual materials in the central cavity, guide cavity, annular cavity, and injection cavity through the cooperation of the cylinder and the push plate, preventing residual materials from affecting the next injection molding. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the sealing plate structure of this utility model.

[0022] Figure 3 This is a schematic diagram of the adhesive injection assembly structure of this utility model.

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the upper mold base of this utility model.

[0024] In the diagram: 1. Lower mold base; 11. Upper mold base; 2. Multi-hole injection mechanism; 21. Glue inlet assembly; 211. Sealing plate; 2111. Mounting groove; 212. Bolt; 2121. Threaded groove; 213. Glue inlet; 214. Positioning block; 2141. Positioning groove; 215. Central cavity; 216. Guide cavity; 217. Annular cavity; 218. Injection cavity; 22. Push assembly; 221. Push plate; 2211. Slot; 222. Cylinder. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1-4 This utility model provides a technical solution: a multi-channel injection mold structure for injection molded parts with inclined surfaces, including a lower mold base 1, an upper mold base 11 on the upper part of the lower mold base 1, and a multi-hole injection mechanism 2 in the middle of the upper mold base 11 for conveying raw materials during injection molding. The multi-hole injection mechanism 2 includes:

[0027] The glue injection assembly 21 includes a sealing plate 211 disposed on the upper part of the upper mold base 11. A glue inlet 213 is opened in the middle of the sealing plate 211. A central cavity 215 is opened in the middle of the top of the upper mold base 11. Four guide cavities 216 communicating with the central cavity 215 are opened in the top of the upper mold base 11. The four guide cavities 216 are evenly distributed radially with the central cavity 215 as the center. The inner wall of the cavity is polished to ensure smooth melt flow. An annular cavity 217 is opened in the top of the upper mold base 11. The annular cavity 217 is arranged around the central cavity 215, which serves as a melt buffer and pressure equalization to avoid overflow caused by excessive local pressure. The annular cavity 217 is connected to the guide cavity 216. Multiple injection cavities 218 connected to the annular cavity 217 are opened in the middle of the upper mold base 11. The position of the injection cavity 218 corresponds one-to-one with the position of the guide cavity 216 to ensure that the raw material enters each injection cavity 218 at the same speed. Bolts 212 are slidably locked at the four corners of the sealing plate 211.

[0028] The push assembly 22 is located in the middle of the upper mold base 11 and is used to push out the remaining injection molding material in the central cavity 215, the guide cavity 216, the annular cavity 217 and the injection cavity 218.

[0029] The push assembly 22 includes a cylinder 222 fixedly installed on the upper part of the upper mold base 11, and a push plate 221 is fixedly installed on the drive end of the cylinder 222.

[0030] An installation groove 2111 is provided at the top center of the upper mold base 11. The sealing plate 211 is slidably engaged in the middle of the installation groove 2111 to ensure a sealed connection with the upper mold base 11. The depth of the installation groove 2111 is slightly higher than the thickness of the sealing plate 211. A high-temperature resistant sealing ring is provided between the mating surfaces of the sealing plate 211 and the installation groove 2111 to ensure a sealed connection with the upper mold base 11 and effectively prevent the melt from overflowing from the mating gap.

[0031] The upper part of the upper mold base 11 has multiple evenly distributed threaded grooves 2121. The lower parts of multiple bolts 212 are threadedly installed in the middle of the threaded grooves 2121. The pre-tightening force of the bolts 212 tightly presses the sealing plate 211 into the mounting groove 2111 to ensure sealing reliability and facilitate the disassembly and maintenance of the sealing plate 211.

[0032] Two symmetrically distributed positioning blocks 214 are fixedly installed at the bottom of the sealing plate 211. Two positioning grooves 2141 are opened on the upper part of the upper mold base 11 to cooperate with the positioning blocks 214 to position the sealing plate 211. Through the precise cooperation between the positioning blocks 214 and the positioning grooves 2141, the sealing plate 211 can be quickly positioned and installed, ensuring the coaxiality of the glue inlet 213 and the central cavity 215, and avoiding melt leakage or uneven flow caused by misalignment.

[0033] The upper mold base 11 has a slot 2211 in the middle, and the push plate 221 is slidably locked in the slot 2211 to ensure that the push plate 221 is flush with the lower surface of the central cavity 215. The upper surface of the push plate 221 is flush with the lower surface of the central cavity 215 to ensure that the melt flow is not obstructed during injection. The edge of the push plate 221 is provided with a chamfer structure to avoid scratching the inner wall of the cavity during the push process.

[0034] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0035] During operation, after the mold is started, the lower mold base 1 and the upper mold base 11 are aligned and closed by the preset guide pillars. After the mold is closed, a cavity matching the contour of the inclined injection molded part is formed between the two. At the same time, the sealing plate 211 on the upper mold base 11 cooperates with the positioning groove 2141 of the upper mold base 11 through the bottom positioning block 214, ensuring that the glue inlet 213 in the middle of the sealing plate 211 is coaxially aligned with the central cavity 215 of the upper mold base 11. The bolts 212 at the four corners are pre-tightened through the thread groove 2121 to press the sealing plate 211 tightly into the mounting groove 2111, and achieve sealing with the high temperature resistant sealing ring.

[0036] The injection nozzle of the injection molding machine is connected to the inlet 213 of the sealing plate 211. The molten injection material (melt) enters the central cavity 215 of the upper mold base 11 through the inlet 213. After the central cavity 215 temporarily stores the melt, the melt flows along four radially evenly distributed guide cavities 216 with the central cavity 215 as the center. Then the melt enters the annular cavity 217 surrounding the central cavity 215. The annular cavity 217 plays a role in buffering and pressure equalization. Finally, the melt in the annular cavity 217 is transported to the key molding area of ​​the cavity (especially the inclined part) through multiple injection cavities 218 corresponding to the guide cavities 216.

[0037] After injection molding is stopped, the upper mold base 11 is cooled down. At this time, the sealing plate 211 is removed from the upper part of the upper mold base 11. Then, after the cylinder 222 receives the control signal, the drive end drives the push plate 221 to slide upward along the guide rail in the slot 2211 through the floating joint. Since the push plate 221 is initially flush with the lower surface of the central cavity 215, it can push the solidified material remaining in the central cavity 215, the guide cavity 216, the annular cavity 217 and the injection cavity 218 during the sliding process, and completely push it out of the channel.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] 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. A multi-channel injection mold structure for injection molded parts with inclined surface structures, including a lower mold base (1), characterized in that: The lower mold base (1) has an upper mold base (11) at its upper part, and a multi-hole injection molding mechanism (2) is provided in the middle of the upper mold base (11) for conveying raw materials during injection molding. The multi-hole injection molding mechanism (2) includes: The injection assembly (21) includes a sealing plate (211) disposed on the upper part of the upper mold base (11), an injection port (213) is provided in the middle of the sealing plate (211), a central cavity (215) is provided in the middle of the top of the upper mold base (11), four guide cavities (216) communicating with the central cavity (215) are provided in the top of the upper mold base (11), an annular cavity (217) is provided in the top of the upper mold base (11), the annular cavity (217) is communicating with the guide cavity (216), multiple injection cavities (218) communicating with the annular cavity (217) are provided in the middle of the upper mold base (11), and bolts (212) are slidably engaged at the four corners of the sealing plate (211). The push assembly (22) is located in the middle of the upper mold base (11) and is used to push out the remaining injection molding material in the central cavity (215), the guide cavity (216), the annular cavity (217) and the injection cavity (218).

2. The multi-channel injection mold structure for injection molded parts with inclined surface structures according to claim 1, characterized in that: The push assembly (22) includes a cylinder (222) fixedly installed on the upper part of the upper mold base (11), and a push plate (221) is fixedly installed on the drive end of the cylinder (222).

3. The multi-channel injection mold structure for injection molded parts with inclined surface structures according to claim 1, characterized in that: The upper mold base (11) has an installation groove (2111) at the top center, and the sealing plate (211) is slidably engaged in the middle of the installation groove (2111) so that it can be sealed and connected with the upper mold base (11).

4. The multi-channel injection mold structure for injection molded parts with inclined surface structures according to claim 1, characterized in that: The upper part of the upper mold base (11) is provided with multiple evenly distributed threaded grooves (2121), and the lower parts of multiple bolts (212) are threadedly installed in the middle of the threaded grooves (2121).

5. The multi-channel injection mold structure for injection molded parts with inclined surface structures according to claim 1, characterized in that: Two symmetrically distributed positioning blocks (214) are fixedly installed at the bottom of the sealing plate (211), and two positioning grooves (2141) are opened on the upper part of the upper mold base (11) to cooperate with the positioning blocks (214) to position the sealing plate (211).

6. The multi-channel injection mold structure for injection molded parts with inclined surface structures according to claim 2, characterized in that: The upper mold base (11) has a slot (2211) in the middle, and the push plate (221) is slidably locked in the slot (2211) to ensure that the push plate (221) and the lower surface of the central cavity (215) remain flush.

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