A material ejection mechanism for injection molds

Abstract

This utility model discloses a material ejection mechanism for a steering wheel grip injection mold, including a mold mechanism for injection molding a steering wheel grip, within which are assembled and connected a plurality of core rods for injection molding the steering wheel grip, and the steering wheel grip being fitted onto the core rods after molding; it also includes an ejection mechanism for ejecting the steering wheel grip; the ejection mechanism includes an ejection bracket assembled and connected to the mold mechanism, and the core rods are fixedly mounted on the ejection bracket; an ejection slide for ejecting the steering wheel grip is slidably assembled and connected to the core rods; the ejection slide uses an air-blowing structure to blow high-pressure airflow between the steering wheel grip and the core rods, separating the steering wheel grip from the core rods by air-blowing; the ejection mechanism also includes a pushing structure for pushing the ejection slide to slide and eject the material. The above structure solves the technical defect of difficulty in ejecting material during the steering wheel grip injection molding process.

Description

Technical Field

[0001] This utility model belongs to the field of material ejection technology for handle sleeve injection molding, and particularly relates to a material ejection mechanism for handle sleeve injection molds. Background Technology

[0002] Handlebar grips are protective covers on the handlebars of electric bikes or motorcycles, commonly known as handlebar skins. Made of rubber, they are fitted onto the handlebars and feature structures such as raised bumps to increase friction, thereby improving the stability of the rider's grip and enhancing handling stability during riding, ultimately increasing safety.

[0003] The steering wheel grip is injection molded. In existing technology, the main structure of the injection mold for the steering wheel grip includes a first mold part and a second mold part that cooperate with each other. The mold is installed on an injection molding machine. During the injection process, a pushing structure on the machine (mostly a hydraulic cylinder) merges the first mold part and the second mold part. Then, the injection material is injected from the inlet on the mold. Injection grooves are formed on the side walls of the first mold part and the second mold part facing each other. When the first mold part and the second mold part are merged, the injection grooves form an injection cavity. A mandrel (equivalent to a mold rod) is installed in the mold and located in the injection cavity. The injected plastic enters the injection cavity and, after molding, is fitted onto the mandrel.

[0004] After injection molding is completed, cold water is injected into the mold through the water inlet on the mold to cool the injection sleeve.

[0005] Subsequently, driven by the push mechanism, the first mold section and the second mold section separate, and the handle sleeve automatically detaches from the core rod. This is because, after water cooling, the metal core rod expands and contracts with the temperature, increasing the gap between it and the formed handle sleeve, thus causing the handle sleeve to separate.

[0006] However, in actual operation, it was found that after the mold was opened, some grip sleeves remained tightly fitted onto the core rod and could not detach on their own. Therefore, existing technologies often use tools to remove the grip sleeves in this situation.

[0007] However, in actual operation, because the grips are made of rubber, forcibly removing them with tools can easily tear and damage the inner wall of the grips. This is because, even after water cooling, the grips remain very hot, and the rubber material adheres to the stem; forcibly removing it causes tearing and damage. Additionally, any rubber residue adhering to the stem needs to be cleaned to maintain its cleanliness.

[0008] Therefore, the aforementioned defects are the fundamental reasons for the high production losses, complex operation, and low production efficiency in the production of grip sleeves.

[0009] Therefore, finding a simple and efficient way to remove the injection-molded grips is crucial to improving grip production efficiency. Utility Model Content

[0010] Based on the above background, the purpose of this utility model is to provide a material ejection mechanism for injection molds.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A material ejection mechanism for a steering wheel sleeve injection mold includes a mold mechanism for injection molding a steering wheel sleeve, wherein a plurality of core rods for injection molding the steering wheel sleeve are assembled and connected within the mold mechanism, and the steering wheel sleeve is fitted onto the core rods after molding; it also includes an ejection mechanism for ejecting the steering wheel sleeve.

[0013] The ejection mechanism includes an ejection bracket assembled and connected to the mold mechanism, and the core rod is fixedly installed on the ejection bracket;

[0014] The core rod is slidably connected to an ejector slide, which is a material ejection handle sleeve; the material ejection slide uses an air blowing structure to blow high-pressure airflow between the handle sleeve and the core rod, thus separating the handle sleeve and the core rod by air blowing.

[0015] The ejection mechanism also includes a push structure that drives the ejection slide to eject the material.

[0016] Preferably, the mold mechanism includes a first mold and a second mold that cooperate with each other;

[0017] The ejector bracket has several sliding guide pillars fixedly connected to both sides of the first mold and the second mold respectively.

[0018] The first mold and the second mold are provided with injection grooves that cooperate with the core rod. When the first mold and the second mold are combined, an injection cavity is formed between the core rod and the injection groove.

[0019] The first mold and the second mold are equipped with a feed inlet structure for feeding the injection molding trough and a water inlet structure for feeding cooling water.

[0020] After the injection molding material is fed into the injection cavity through the inlet structure, the material is formed into a sleeve and fitted onto the core rod. Cooling water is then introduced into the injection cavity through the water inlet structure to cool the sleeve.

[0021] Preferably, the unloading slide has a plurality of sliding openings for slidingly connecting the core rod.

[0022] Preferably, the air blowing structure includes an airflow channel structure formed within the slide table;

[0023] The airflow channel structure includes a main airflow channel, and the slide table has several branch channels that connect to the main airflow channel.

[0024] The air outlet of the diversion channel is located at the mouth of the slide.

[0025] Preferably, the opening of the sliding mouth is provided with a plurality of distributed air outlets.

[0026] Preferably, the air outlet of the diversion channel includes a first air outlet near the core rod and a second air outlet away from the core rod.

[0027] Preferably, the air inlet of the main airflow channel is connected to a flexible hose, and the flexible hose is connected to an external pump structure.

[0028] Preferably, the pushing structure includes a pushing cylinder, and the piston rod of the pushing cylinder is fixedly installed on the top of the unloading slide;

[0029] The piston rod of the cylinder is slidably connected to the ejector bracket.

[0030] Preferably, a cylinder bracket is fixedly installed on the top of the material ejection bracket, and the cylinder barrel of the push cylinder is fixedly assembled at the top position of the cylinder bracket.

[0031] Preferably, four equidistant core rods are fixedly installed at the bottom of the material ejection bracket.

[0032] This utility model has the following beneficial effects:

[0033] 1. During the material removal process, a high-pressure airflow is blown between the grip sleeve and the core rod via an air-blowing structure. This high-pressure airflow moderately expands the grip sleeve, forcibly passing through the gap between the grip sleeve and the core rod, thus fully separating them. This method uses airflow to expand the gap between the grip sleeve and the core rod, facilitating material removal. It overcomes the shortcomings of traditional forced material removal methods, which easily tear the inner wall of the grip sleeve during the downward pressure process.

[0034] 2. During the material ejection process, high-pressure gas is pumped from the hose to the ejection slide. The airflow is split from the main airflow channel and discharged from the air outlet of each split channel and blown toward the core rod. Because the outer side of the core rod is fitted with the handle sleeve that failed to eject during injection molding, the handle sleeve is "slightly expanded" with the assistance of the airflow, increasing the gap between the handle sleeve and the core rod, thus realizing airflow-assisted material ejection.

[0035] 3. The air outlet is designed in an L-shape, specifically comprising a first air outlet near the core rod and a second air outlet further away from the core rod. The first air outlet is normally blocked by the outer wall of the core rod, while the second air outlet, being farther from the core rod, is not obstructed. The advantage of this design is that it prevents the core rod from completely blocking the air outlet during high-pressure air blowing.

[0036] 4. The cylinder-driven ejection slide assists in air blowing to ensure that all sleeves are removed from the core rod after ejection. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model;

[0039] Figure 2 This is a schematic diagram of the overall structure of the material ejection bracket in an embodiment of the present utility model;

[0040] Figure 3 This is a schematic diagram of the unloading slide in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the air inlet position of the airflow channel in the unloading slide of this utility model embodiment;

[0042] Figure 5 This is a schematic diagram showing the positional relationship between the air outlet and the sliding opening in an embodiment of this utility model;

[0043] Figure 6 This is a schematic diagram of the structure of the main airflow channel and the branching channel on the unloading slide in an embodiment of this utility model; wherein, the main airflow channel and the branching channel are shown after the unloading slide is partially cut apart;

[0044] Figure 7 This is a schematic diagram of the unloading slide in an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the shape and structure of the air outlet in an embodiment of this utility model;

[0046] Figure 9 This is a schematic diagram of the core rod mounting ejector bracket and the sleeve assembly in an embodiment of this utility model.

[0047] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0048] 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.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0050] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0051] Example 1

[0052] like Figure 1-9 As shown, a steering wheel grip injection mold ejection mechanism includes a mold mechanism 1 for injection molding a steering wheel grip. The mold mechanism 1 is a conventional injection mold for steering wheel grips disclosed in the prior art, and has the same structure as the existing injection mold for steering wheel grips. Its main structure includes a first mold 11 and a second mold 12 that cooperate with each other.

[0053] The ejector bracket 22 described below has a pair of sliding guide pillars 211 fixedly connected to its left and right sides, which are spaced apart and slidably connected to the upper ends of the first mold 11 and the second mold 12 (similar to existing molds, the lower ends of the first mold 11 and the second mold 12 are also slidably connected by sliding guide pillars).

[0054] To increase the stability of the sliding connection between the first mold 11 and the second mold 12, similar to existing injection molds, the outer walls of the first mold 11 and the second mold 12 are slidably connected by a slide bar 13 with a sliding opening (the slide bar 13 is installed on the outer wall of the ejector bracket 22). A sliding seat with a limit sliding connection is fixedly connected to the outer walls of the first mold 11 and the second mold 12, and the sliding seat is slidably connected inside the sliding opening.

[0055] Similar to existing mold structures, the first mold 11 and the second mold 12 are provided with injection grooves that mate with the core rods 25. When the first mold 11 and the second mold 12 are combined, an injection cavity is formed between the core rods 25 and the injection grooves. At the same time, four core rods 25 for injection molding of the handle 3 are assembled and connected inside the mold mechanism 1. After the handle 3 is formed, it is fitted onto the core rods 25.

[0056] Similar to existing mold injection feeding and cooling water methods, the first mold 11 and the second mold 12 are equipped with a feeding port structure for feeding the injection tank material and a cooling water inlet structure. After the injection tank material is fed into the injection cavity through the feeding port structure, the material is formed into a sleeve 3 and fitted onto the core rod 25. Cooling water is then introduced into the injection cavity through the water inlet structure to cool the sleeve 3.

[0057] The injection molding operation is the same as the existing method. The entire mold mechanism 1 is installed on the injection molding equipment. The first mold 11 and the second mold 12 are closed by the pushing structure on the injection molding equipment, such as the hydraulic cylinder, and then injection molding is performed. After opening, the material is ejected.

[0058] Those skilled in the art can learn about the specific structure of the mold mechanism 1 disclosed in this utility model and the injection molding working principle process by consulting technical manuals and dictionaries, as well as how existing injection molding equipment drives the first mold 11 and the second mold 12 to open and close during the injection molding process.

[0059] Because the material of the handlebar grip 3 is rubber, after the injection molding is completed, the first mold 11 and the second mold 12 separate. At this time, some of the handlebar grip 3 is easy to stick to the core rod 25 and cannot be ejected by itself. Therefore, in order to improve the ejection effect and achieve ejection in a protective manner to avoid damage to the handlebar grip 3 during the ejection process (at this time, the handlebar grip 3 has just been injection molded and the temperature is still high. The traditional ejection method, which uses a forced downward ejection method, is easy to pull and damage the inner wall of the handlebar grip 3).

[0060] Therefore, this utility model improves upon the existing mold structure. Specifically, the ejection mechanism of the injection mold for the handle sleeve 3 also includes an ejection mechanism 2 for ejecting the handle sleeve 3.

[0061] The ejection mechanism 2 includes an ejection bracket 22 assembled and connected to the mold mechanism 1, and the core rod 25 is fixedly installed on the ejection bracket 22. The upper end of the ejection bracket 22 is located outside the mold cavity, and the lower end is located inside the mold cavity.

[0062] After the mold structures are combined, the first mold 11, the second mold 12 and the lower part of the ejector bracket 22 form a closed structure, which facilitates subsequent injection molding.

[0063] Therefore, in order to improve the material ejection efficiency, the ejection slide 23 with ejection handle 3 is slidably connected to the core rod 25. Specifically, the ejection slide 23 has four sliding openings 231 that are slidably connected to the core rod 25.

[0064] At the same time, the ejector slide 23 blows high-pressure airflow between the handle sleeve 3 and the core rod 25 through the air blowing structure, separating the handle sleeve 3 and the core rod 25 by air blowing.

[0065] During the unloading process, a high-pressure airflow is blown between the grip sleeve 3 and the core rod 25 via an air-blowing structure. This high-pressure airflow moderately expands the grip sleeve 3, forcibly passing through the gap between the grip sleeve 3 and the core rod 25, thus fully separating them. This method expands the grip sleeve 3 and core rod 25 using airflow, increasing the gap and facilitating unloading. It solves the problem of traditional forced unloading methods that easily tear the inner wall of the grip sleeve 3 during the downward pressure process.

[0066] Meanwhile, to assist the air-blowing structure in ejecting material, the ejection mechanism 2 also includes a pushing structure that pushes the ejection slide 23 to slide and eject material. By pushing the ejection slide 23 downwards, the already separated grip sleeve 3 is ejected from the core rod 25.

[0067] Example 2

[0068] like Figure 1-9 As shown, this embodiment further discloses the specific structure of the air blowing structure based on the structure of embodiment 1.

[0069] Specifically, the air blowing structure includes an airflow channel structure 24 formed within the slide table. The specific structure is as follows: the airflow channel structure 24 includes a main airflow channel 2411 (extending along the length of the four slide ports 231), and the unloading slide table 23 has several branch channels 2412 connected to the main airflow channel 2411.

[0070] Specifically, each slide 231 corresponds to three diversion channels 2412, and the air outlet of the diversion channel 2412 is located at the opening position (lower port position) of the slide 231.

[0071] The air outlets 242 of the three diversion channels 2412 are located at the sliding port 231, and the specific distribution method is: triangular distribution.

[0072] Furthermore, to prevent the core rod 25 from completely blocking the air outlet 242, the air outlet 242 is designed in an L-shape. That is, the air outlet 242 of the diversion channel 2412 includes a first air outlet portion 2421 close to the core rod 25 and a second air outlet portion 2422 far away from the core rod 25. The first air outlet portion 2421 is normally blocked by the outer wall of the core rod 25, while the second air outlet portion 2422 is not blocked by the core rod 25 because it is farther away from the core rod 25.

[0073] The advantage of this design is that it prevents the core rod 25 from completely blocking the air outlet 242 during the high-pressure air blowing process.

[0074] The air inlet 241 of the aforementioned main airflow channel 2411 is connected to a flexible hose (specifically, in the existing method, the hose is connected to the air inlet 241 via a connector, such as installing an air inlet connector at the air inlet 241 and inserting the hose into the air inlet connector), the air inlet connector and hose are not shown in the figure. In the existing method of pumping high-pressure airflow, the hose is connected to an external pumping structure, such as a high-pressure air pump.

[0075] During operation, high-pressure gas is pumped from the hose into the ejector slide 23. The airflow is split from the main airflow channel 2411 and then discharged from the air outlet 242 of each split channel 2412 and blown toward the core rod 25. The outer side of the core rod 25 is fitted with the handle sleeve 3, which was not successfully ejected during injection molding. Therefore, with the assistance of the airflow, the handle sleeve 3 is "slightly expanded", increasing the gap between the handle sleeve 3 and the core rod 25, thus realizing airflow-assisted ejection.

[0076] Example 3

[0077] like Figure 1-9 As shown, this embodiment is based on the structure of embodiment 2. In order to further assist the air blowing structure in unloading material, and to solve the problem that when the air blowing method cannot remove the handle sleeve 3, a mechanical pushing method is used to unload the material.

[0078] To address this, a push structure is designed to eject material via a push-out slide 23. Specifically, the push structure includes a push cylinder 21, the piston rod of which is fixedly mounted on the top of the ejection slide 23 (the piston rod of the push cylinder 21 is slidably connected to the ejection bracket 22).

[0079] Meanwhile, a cylinder bracket 211 is fixedly installed on the top of the ejector bracket 22, and the cylinder barrel of the push cylinder 21 is fixedly assembled on the top position of the cylinder bracket 211.

[0080] During operation, driven by the cylinder 21, the ejector slide 23, which is slidably mounted on the upper end of the core rod 25, slides down to eject the sleeve 3 of the set.

[0081] The above-mentioned material removal process, including air-blowing removal and cylinder removal, is completed by injection molding. At this time, the mold opens and the first mold 11 and the second mold 12 separate, thus ensuring smooth material removal.

[0082] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A material ejection mechanism for a steering wheel sleeve injection mold, comprising a mold mechanism for injection molding a steering wheel sleeve, wherein a plurality of core rods for injection molding the steering wheel sleeve are assembled and connected within the mold mechanism, and the steering wheel sleeve is fitted onto the core rods after molding; characterized in that, It also includes a material ejection mechanism for ejecting the material handle sleeve; The ejection mechanism includes an ejection bracket assembled and connected to the mold mechanism, and the core rod is fixedly installed on the ejection bracket; The core rod is slidably connected to an ejector slide, which is a material ejection handle sleeve; the material ejection slide uses an air blowing structure to blow high-pressure airflow between the handle sleeve and the core rod, thus separating the handle sleeve and the core rod by air blowing. The ejection mechanism also includes a push structure that drives the ejection slide to eject the material.

2. The ejection mechanism for the injection mold according to claim 1, characterized in that, The mold mechanism includes a first mold and a second mold that cooperate with each other; The ejector bracket has several sliding guide pillars fixedly connected to both sides of the first mold and the second mold respectively. The first mold and the second mold are provided with injection grooves that cooperate with the core rod. When the first mold and the second mold are combined, an injection cavity is formed between the core rod and the injection groove. The first mold and the second mold are equipped with a feed inlet structure for feeding the injection molding trough and a water inlet structure for feeding cooling water. After the injection molding material is fed into the injection cavity through the inlet structure, the material is formed into a sleeve and fitted onto the core rod. Cooling water is then introduced into the injection cavity through the water inlet structure to cool the sleeve.

3. The ejection mechanism for the injection mold according to claim 2, characterized in that, The unloading slide has several sliding openings for connecting the core rod.

4. The ejection mechanism for the injection mold according to claim 3, characterized in that, The air blowing structure includes an airflow channel structure formed within the slide table; The airflow channel structure includes a main airflow channel, and the slide table has several branch channels that connect to the main airflow channel. The air outlet of the diversion channel is located at the mouth of the slide.

5. The ejection mechanism for the injection mold according to claim 4, characterized in that, The opening of the slide has several distributed air outlets.

6. The ejection mechanism for the injection mold according to claim 5, characterized in that, The air outlet of the diversion channel includes a first air outlet near the core rod and a second air outlet away from the core rod.

7. The ejection mechanism for a sleeve injection mold according to claim 4, characterized in that, The air inlet of the main airflow channel is connected to a flexible hose, which is connected to an external pump structure.

8. The ejection mechanism for a sleeve injection mold according to claim 4, characterized in that, The pushing structure includes a pushing cylinder, and the piston rod of the pushing cylinder is fixedly installed on the top of the unloading slide; The piston rod of the cylinder is slidably connected to the ejector bracket.

9. The ejection mechanism for a sleeve injection mold according to claim 8, characterized in that, A cylinder bracket is fixedly installed on the top of the material ejection bracket, and the cylinder barrel of the push cylinder is fixedly assembled on the top position of the cylinder bracket.

10. The ejection mechanism for a sleeve injection mold according to claim 1, characterized in that, The bottom of the material ejection bracket is fixedly equipped with four equidistant core rods.

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