A core-pulling and demolding mechanism for an electric vehicle tail box injection mold

Abstract

This utility model relates to the technical field of demolding mechanisms, and discloses a core-pulling and demolding mechanism for an electric vehicle tail box injection mold. The mechanism includes a mold, with a core-pulling mechanism fixedly installed in the inner cavity of the mold, and a quick-release mechanism fixedly installed on the top of the mold. The core-pulling mechanism includes an air inlet pipe, the bottom end of which is connected to the top of the mold. An air distribution groove is formed in the inner cavity of the mold, and an air distribution component is fixedly installed on the inner surface of the air distribution groove. This core-pulling and demolding mechanism for an electric vehicle tail box injection mold uses a micro-motor to drive a rotating shaft. The rotating shaft rotates via a flow guide, which introduces air into the left side of the air distribution groove. The air is injected into a sliding groove through a connecting groove, pushing a sealed top plate. The sealed top plate then moves a push rod downwards. Molten plastic enters the mold through a pipe, filling the gaps between the two molds, thus successfully injection molding and hardening the electric vehicle tail box.

Description

Technical Field

[0001] This utility model relates to the technical field of demolding mechanisms, and in particular to a core-pulling and demolding mechanism for an injection mold of an electric vehicle tail box. Background Technology

[0002] Electric vehicle tail box injection molds are specialized tools used for the mass production of electric vehicle tail boxes. They are typically made of high-strength steel (such as P20, 718H, or hard alloy) and precision-machined by CNC, featuring complex cavity structures and ejection systems. Mold design must balance lightweighting, waterproofing, and structural strength. Common mold structures include two-plate or three-plate molds, equipped with sliders and angled ejector mechanisms to handle undercut features, and a mold temperature controller to control the molding cycle. During production, materials such as ABS, PP, or PC / ABS are injected into the mold at high temperatures using an injection molding machine. After cooling, a one-piece molded box is formed. Production efficiency can reach dozens of pieces per hour. The surface finish must meet the requirements for painting or texturing. The mold life typically exceeds 500,000 cycles, requiring regular maintenance to ensure dimensional stability.

[0003] The core-pulling mechanism in electric vehicle tail box injection molds is mainly used to handle the undercut structures (such as latches, slots, or reinforcing ribs) on the sides of the box. It typically employs methods such as angled ejectors, sliders, or hydraulic core-pulling. Angled ejector mechanisms achieve lateral demolding through angular movement during mold opening, suitable for shallow undercuts. However, complex deep cavities or large-angle undercuts require sliders driven by springs or angled guide pillars. Some large molds also use hydraulic cylinders to ensure stable core pulling. However, core-pulling demolding structures are complex and costly. Furthermore, sliders or angled ejectors are prone to wear, jamming, or incomplete repositioning, leading to product defects (such as scratches, burrs), and even mold damage. Therefore, frequent maintenance is required. Replacing sliders or angled ejectors necessitates disassembling the entire mold, resulting in low maintenance efficiency. Utility Model Content

[0004] In view of the problems of complex structure and low maintenance and replacement efficiency of existing electric vehicle tail box mold core pulling equipment, this utility model is proposed.

[0005] Therefore, the purpose of this utility model is to provide a core-pulling and demolding mechanism for electric vehicle tail box injection molds. The purpose is that the core-pulling equipment for electric vehicle tail box molds has a simple structure and can be quickly removed without dismantling the entire mold.

[0006] To solve the above technical problems, this utility model provides the following technical solution: a core-pulling and demolding mechanism for an injection mold of an electric vehicle tail box, including a mold, a core-pulling mechanism fixedly installed in the inner cavity of the mold, and a quick-release mechanism fixedly installed on the top of the mold;

[0007] The core-pulling mechanism includes an air inlet pipe, the bottom end of which is connected to the top of the mold. The inner cavity of the mold is formed by an air distribution groove, and an air distribution component is fixedly installed on the inner surface of the air distribution groove.

[0008] As a preferred embodiment of the core-pulling and demolding mechanism for the injection mold of the electric vehicle tail box of this utility model, the air distribution component includes a micro motor, the output end of the micro motor is fixedly mounted with a rotating shaft through a reducer, and a flow guide is fixedly mounted on the outer surface of the rotating shaft.

[0009] As a preferred embodiment of the core-pulling and demolding mechanism for the electric vehicle tail box injection mold of this utility model, the outer surface of the micro motor is fixedly connected to the inner surface of the mold, the front end of the rotating shaft passes through the mold and extends into the interior of the mold, and the outer surface of the flow guide is rotatably connected to the inner surface of the air distribution groove.

[0010] As a preferred embodiment of the core-pulling and demolding mechanism for the injection mold of the electric vehicle tail box of this utility model, the core-pulling mechanism further includes a demolding and core-pulling assembly, the demolding and core-pulling assembly includes a slide groove, a spring is fixedly installed on the inner surface of the slide groove, a push rod is sleeved on the inner surface of the spring, and a sealed top plate is fixedly installed on the top of the push rod.

[0011] As a preferred embodiment of the core-pulling and demolding mechanism for the electric vehicle tail box injection mold of this utility model, the slide groove is opened in the inner cavity of the mold, and the bottom of the sealed top plate is fixedly connected to the top of the spring.

[0012] As a preferred embodiment of the core-pulling and demolding mechanism for the electric vehicle tail box injection mold of this utility model, the quick-release mechanism includes a top block, the outer surface of which is fixedly connected to the inner surface of the mold by bolts, and the inner surface of the top block is provided with a connecting groove.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] 1. This utility model reduces the number of parts in the core-pulling mold structure. By using the mold and air inlet pipe in conjunction with the air distribution groove and the flow guide, and by using the flow guide and rotating shaft in conjunction with the micro motor and the connecting groove, and by using the push rod and slide groove in conjunction with the spring and the sealed top plate, the core-pulling mold structure can be reduced while still achieving the effect of core pulling and demolding, thus reducing costs.

[0015] 2. This utility model improves upon the design of a quick-change core-pulling device by using a top block and bolt in conjunction with a connecting groove and a mold, and by using a sealed top plate and a top rod in conjunction with a spring. This allows for the quick removal of damaged top rods, avoiding the need to disassemble the mold for replacement and repair when changing top rods. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the core-pulling and demolding mechanism of the electric vehicle tail box injection mold of this utility model;

[0017] Figure 2 This is a partial cross-sectional view of the mold structure of the core-pulling and demolding mechanism of the electric vehicle tail box injection mold of this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the gas distribution component of the core-pulling and demolding mechanism for the electric vehicle tail box injection mold of this utility model.

[0019] Figure 4 This is a partial cross-sectional view of the mold and the core-pulling mechanism of the electric vehicle tail box injection mold of this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Mold; 2. Core pulling mechanism; 21. Air inlet pipe; 22. Air distribution groove; 23. Air distribution assembly; 231. Micro motor; 232. Rotating shaft; 233. Flow guide frame; 24. Demolding and core pulling assembly; 241. Slide groove; 242. Spring; 243. Ejector rod; 244. Sealed top plate; 3. Quick release mechanism; 31. Ejector block; 32. Bolt; 33. Connecting groove. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Example 1

[0023] Reference Figures 1-4 This is the first embodiment of the present invention, which provides a core-pulling and demolding mechanism for an electric vehicle tail box injection mold. The core-pulling and demolding mechanism for the electric vehicle tail box injection mold includes a mold 1, a core-pulling mechanism 2 fixedly installed in the inner cavity of the mold 1, and a quick-release mechanism 3 fixedly installed on the top of the mold 1.

[0024] The core-pulling mechanism 2 includes an air inlet pipe 21, the bottom end of which is connected to the top of the mold 1. The inner cavity of the mold 1 is opened in the air distribution groove 22, and the inner surface of the air distribution groove 22 is fixedly installed with an air distribution component 23.

[0025] The gas distribution assembly 23 includes a micro motor 231. The output end of the micro motor 231 is fixedly mounted with a rotating shaft 232 via a speed reducer. A diverter 233 is fixedly mounted on the outer surface of the rotating shaft 232.

[0026] The outer surface of the micro motor 231 is fixedly connected to the inner surface of the mold 1, the front end of the rotating shaft 232 passes through the mold 1 and extends into the interior of the mold 1, and the outer surface of the flow guide 233 is rotatably connected to the inner surface of the air distribution groove 22.

[0027] The core-pulling mechanism 2 also includes a core-pulling assembly 24, which includes a slide 241. A spring 242 is fixedly installed on the inner surface of the slide 241. A push rod 243 is sleeved on the inner surface of the spring 242. A sealed top plate 244 is fixedly installed on the top of the push rod 243.

[0028] The chute 241 is opened into the inner cavity of the mold 1, and the bottom of the sealed top plate 244 is fixedly connected to the top of the spring 242.

[0029] During use, the air intake pipe 21 first injects external air into the air distribution groove 22. Then, the micro motor 231 drives the rotating shaft 232 to rotate. The rotating shaft 232 rotates through the flow guide 233, so that the air is introduced into the left side of the air distribution groove 22 by the flow guide 233. The air is injected into the slide groove 241 through the connecting groove 33. The air pushes the sealed top plate 244, and the sealed top plate 244 drives the push rod 243 to move downward. Then, the molten plastic enters the mold 1 through the pipe. When passing through the two molds 1, the plastic solution fills the gap, so that the electric vehicle tail box is successfully injected and hardened. Then, the two molds 1 are opened, and the micro motor 231 drives the flow guide 233 to reverse, so that the air enters the right side of the air distribution groove 22. The spring 242 drives the push rod 243 to return through the sealed top plate 244, so that the push rod 243 in the electric vehicle tail box lock and slot is pulled out. At the same time, the push rod 243 inside the mold 1 on the right side is pushed out, and the manufactured electric vehicle tail box is pushed out. Example 2

[0030] Reference Figure 1 and Figure 4 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the quick-release mechanism 3 includes a top block 31. The outer surface of the top block 31 is fixedly connected to the inner surface of the mold 1 by bolts 32. A connecting groove 33 is provided on the inner surface of the top block 31.

[0031] During use, when the ejector pin 243 needs to be repaired or replaced, the user first unscrews the bolt 32, then takes out the ejector block 31, so that the spring 242, the sealing plate 244 and the ejector pin 243 can be taken out and replaced without disassembling the entire mold 1.

[0032] The remaining structure is the same as that in Example 1.

[0033] Based on embodiments 1-2, the working principle of this utility model is as follows: First, the air intake pipe 21 injects external air into the air distribution groove 22. Then, the micro motor 231 drives the rotating shaft 232 to rotate. The rotating shaft 232 rotates through the guide frame 233, causing the air to be introduced into the left side of the air distribution groove 22 by the guide frame 233. The air is injected into the slide groove 241 through the connecting groove 33. The air pushes the sealed top plate 244, which drives the push rod 243 to move downward. Then, the molten plastic enters the mold 1 through the pipe. When passing through the two molds 1, the plastic solution fills the gap, so that the electric vehicle tail box is successfully injected and hardened. When the two molds 1 are opened, the micro motor 231 drives the flow guide 233 to reverse, allowing air to enter the right side of the air distribution groove 22. The spring 242 drives the push rod 243 to return through the sealed top plate 244, causing the push rod 243 in the electric vehicle tail box latch and slot to be pulled out. At the same time, the air injected into the push rod 243 inside the mold 1 on the right side is pushed out, pushing out the manufactured electric vehicle tail box. When the push rod 243 needs to be repaired or replaced, the user first unscrews the bolt 32, then takes out the top block 31, so that the spring 242, the sealed top plate 244 and the push rod 243 can be taken out and replaced without disassembling the entire mold 1.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A core-pulling demolding mechanism of an injection mold for an electric vehicle trunk, comprising a mold (1), characterized in that: The inner cavity of the mold (1) is fixedly equipped with a core-pulling mechanism (2), and the top of the mold (1) is fixedly equipped with a quick-release mechanism (3). The core-pulling mechanism (2) includes an air inlet pipe (21), the bottom end of which is connected to the top of the mold (1). The inner cavity of the mold (1) is opened in the air distribution groove (22), and an air distribution component (23) is fixedly installed on the inner surface of the air distribution groove (22).

2. The core-pulling stripping mechanism of the injection mold for the electric vehicle trunk according to claim 1, characterized in that: The gas distribution assembly (23) includes a micro motor (231), and a rotating shaft (232) is fixedly installed at the output end of the micro motor (231) via a speed reducer. A flow guide (233) is fixedly installed on the outer surface of the rotating shaft (232).

3. The core-pulling stripping mechanism of the injection mold for the electric vehicle trunk according to claim 2, characterized in that: The outer surface of the micro motor (231) is fixedly connected to the inner surface of the mold (1), the front end of the rotating shaft (232) passes through the mold (1) and extends into the interior of the mold (1), and the outer surface of the flow guide (233) is rotatably connected to the inner surface of the air distribution groove (22).

4. The core-pulling stripping mechanism of the injection mold for the electric vehicle trunk according to claim 1, characterized in that: The core-pulling mechanism (2) further includes a core-pulling assembly (24), which includes a groove (241). A spring (242) is fixedly installed on the inner surface of the groove (241). A top rod (243) is sleeved on the inner surface of the spring (242). A sealed top plate (244) is fixedly installed on the top of the top rod (243).

5. The core-pulling stripping mechanism of the injection mold for the electric vehicle trunk according to claim 4, characterized in that: The groove (241) is opened in the inner cavity of the mold (1), and the bottom of the sealed top plate (244) is fixedly connected to the top of the spring (242).

6. The core-pulling stripping mechanism of the injection mold for the electric vehicle trunk according to claim 1, characterized in that: The quick-release mechanism (3) includes a top block (31), the outer surface of which is fixedly connected to the inner surface of the mold (1) by bolts (32), and the inner surface of the top block (31) is provided with a connecting groove (33).

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