A double-channel last for injection molding of a shoe sole

Abstract

The utility model discloses a kind of double-channel continuous soles injection for shoe tree, including bottom mould, shoe tree body and injection molding assembly, bottom mould is equipped with sole mould, shoe tree body is set in sole mould top, shoe tree body top is equipped with inlet, shoe tree body bottom front and back side is equipped with first discharge port and second discharge port, first inlet and first discharge port are equipped with first communication injection tube body, second inlet and second discharge port are equipped with second communication injection tube body, injection molding assembly is set in shoe tree body top.The utility model is through the top of shoe tree body and is equipped with inlet, and the top of inlet is equipped with injection molding assembly, the inside of shoe tree body is equipped with first communication injection tube body and second communication injection tube body, compared with rear side inlet structure, first communication injection tube body and second communication injection tube body length shorten, shorten the flow distance and time of injection molding material, and the angle of the included angle of shoe tree body bottom increases, it is favorable to the flow of injection molding material, guarantee sole quality, suitable for promotion.

Description

Technical Field

[0001] This utility model relates to the field of footwear processing equipment technology, and more specifically to a shoe last for double-channel continuous upper injection molding of shoe soles. Background Technology

[0002] Existing shoe sole injection molding methods typically employ disc-structured shoe sole injection molding machines for mass production. The main injection molding components include the sole mold, last, and mid-frame mold. The last has a material channel running from top to bottom. However, conventional horizontal injection molding machines inject material horizontally from the edge of the sole mold, which is unsuitable for existing internal injection molds. Therefore, methods using internal injection channels within the last to inject material have emerged. This structure has a drawback: the injection material is at a high temperature, and injection from the injection outlet in the middle of the last to the front and back of the sole takes time. This process can cause the injection material temperature to drop, affecting injection quality. Furthermore, a single injection outlet results in low injection efficiency, impacting production efficiency. Currently, some dual-channel injection molded lasts are available, but the injection inlet is still located on the back of the last. The material flow distance is relatively long, resulting in a longer time for the material to pass through the channels, especially the front channel. Therefore, the inventors propose a shoe last for injection molding of a shoe sole with a dual-channel upper. By setting an injection inlet in the middle of the top of the shoe last, the distance between the two injection channels inside the shoe last is shortened, which is beneficial to improving injection efficiency and quality.

[0003] To ensure the high-temperature characteristics of the injection molding material during injection molding, improve flow rate, and enhance injection molding efficiency and quality, Chinese Patent (Authorization Announcement No.: CN222135804U) discloses a novel shoe last for injection molding of connected shoes. This utility model includes a bottom mold and a shoe last body. A sole mold is located in the middle of the bottom mold, and the shoe last body is correspondingly positioned above the sole mold. An inlet is located on the upper rear side of the shoe last body, containing a first inlet and a second inlet. A first outlet and a second outlet are located on the front and rear sides of the bottom of the shoe last body, respectively. A first straight-through connecting pipe is provided between the first inlet and the first outlet, and a second straight-through connecting pipe is provided between the second inlet and the second outlet. This utility model, through the dual channels on the front and rear sides of the shoe last body, ensures the high-temperature characteristics of the injection molding material, increases adhesion, and also improves injection molding efficiency, making it highly practical.

[0004] The solution still has some shortcomings in its application. Since the injection inlet is located on the back of the shoe last, although the dual-channel design can improve injection efficiency, the length of the front channel is still relatively long, which still affects the injection efficiency. At the same time, with the injection inlet on the back of the shoe last, the angle between the front channel and the horizontal plane is small, and the inclination angle is not ideal, which also affects injection. Therefore, the structure of the injection molded shoe last needs to be improved to achieve better injection efficiency and quality, thereby improving the quality of the sole and benefiting the company's production. Utility Model Content

[0005] This utility model discloses a shoe last for injection molding of a double-channel connected upper sole, the main purpose of which is to overcome the above-mentioned deficiencies and shortcomings of the existing technology.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A shoe last for injection molding of a double-channel connected upper sole includes a bottom mold, a shoe last body, and an injection molding assembly. The bottom mold has a sole mold with an upward opening in the middle. The shoe last body is correspondingly disposed above the sole mold and can move up and down. The top of the shoe last body has an inlet, and the front and rear sides of the bottom of the shoe last body have a first outlet and a second outlet, respectively. A first connecting injection molding tube is disposed between the inlet and the first outlet, and a second connecting injection molding tube is disposed between the inlet and the second outlet. The injection molding assembly is disposed above the shoe last body.

[0008] Furthermore, the top of each shoe last is provided with a positioning sliding edge plate.

[0009] Furthermore, both the first and second connected injection molding tubes are straight-through tube structures.

[0010] Furthermore, the feed inlet has a cylindrical structure, and the bottom of the injection molding assembly is fitted with an injection head that is movably embedded in the cylindrical structure.

[0011] Furthermore, the top front and rear sides of the shoe sole mold are respectively provided with a front injection channel and a rear injection channel, which are respectively provided with the first discharge port and the second discharge port.

[0012] Furthermore, the angle between the upper part of the first connecting injection molding tube and the bottom of the shoe last is 60 degrees, and the angle between the upper part of the second connecting injection molding tube and the bottom of the shoe last is 80 degrees.

[0013] As can be seen from the above description of this utility model, compared with the prior art, the advantages of this utility model are as follows:

[0014] This invention firstly features a material inlet at the top of the shoe last, with the injection molding assembly positioned directly above it, employing a direct top-to-bottom connection structure—a clever design that facilitates subsequent injection molding operations. Next, a first and second connecting injection tube are respectively positioned on the inner side of the shoe last, forming angles of 60 degrees and 80 degrees with the bottom of the shoe last, respectively. Compared to existing structures that feed material from the rear, the shorter lengths of the first and second connecting injection tubes further reduce the flow distance and time of the injection material, maximizing the temperature of the injection material, increasing molding speed, and improving adhesion. Finally, the increased angle between the first and second connecting injection tubes and the bottom of the shoe last, making them more vertical, also facilitates the flow of the injection material, further improving injection efficiency and quality. This invention boasts a novel and ingenious structure, employing a dual-channel design and structural improvements that enhance the injection and flow of the injection material, ensuring sole quality and making it suitable for widespread adoption. Attached Figure Description

[0015] Figure 1 This is a side view of the structure of this utility model.

[0016] Figure 2 This is a bottom view structural diagram of the shoe last of this utility model.

[0017] Figure 3 This is a schematic diagram of the rear view structure of this utility model. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0019] like Figures 1 to 3 As shown, a shoe last for injection molding of a double-channel connected upper sole includes a bottom mold 1, a shoe last body 2, and an injection molding assembly 3. The bottom mold 1 has a shoe sole mold 4 with an upward opening in the middle. The shoe last body 2 is correspondingly disposed above the shoe sole mold 4 and can move up and down. The top of the shoe last body 2 is provided with an inlet 5. The front and rear sides of the bottom of the shoe last body 2 are respectively provided with a first outlet 6 and a second outlet 7. A first connecting injection molding tube 8 is provided between the inlet 5 and the first outlet 6. A second connecting injection molding tube 9 is provided between the inlet 5 and the second outlet 7. The injection molding assembly 3 is disposed above the shoe last body 2.

[0020] Furthermore, the top of the shoe last 2 is provided with positioning sliding plates 10.

[0021] Furthermore, both the first connecting injection molding tube 8 and the second connecting injection molding tube 9 are straight-through tube structures.

[0022] Furthermore, the feed port 5 has a cylindrical structure, and the bottom of the injection molding assembly 3 is adapted to have an injection head 11, which is movably embedded in the cylindrical structure.

[0023] Furthermore, the shoe sole mold 4 is provided with a front injection channel 41 and a rear injection channel 42 on the front and rear sides of the top, respectively, and the front injection channel 41 and the rear injection channel 42 are respectively provided with the first discharge port 6 and the second discharge port 7.

[0024] Furthermore, the angle between the upper part of the first connecting injection molding tube 8 and the bottom of the shoe last 2 is 60 degrees, and the angle between the upper part of the second connecting injection molding tube 9 and the bottom of the shoe last 2 is 80 degrees.

[0025] First, the shoe last 2 is fixed on the turntable of the shoe last 2 by the positioning sliding plate 10 at the top of the shoe last 2. Then, the injection assembly 3 is moved downward so that the injection head 11 is embedded in the feed port 5. Next, the injection material enters the feed port 5 through the injection head 11 and flows through the first connecting injection tube 8 and the second connecting injection tube 9 to the first discharge port 6 and the second discharge port 7 respectively. Finally, it enters the front injection channel 41 and the rear injection channel 42 of the shoe sole mold 4 for shoe sole injection. Finally, after the injection is completed, the injection assembly 3 moves upward to prepare for the injection of the next shoe last 2.

[0026] As can be seen from the above description of this utility model, compared with the prior art, the advantages of this utility model are as follows:

[0027] This invention firstly features a material inlet at the top of the shoe last, with the injection molding assembly positioned directly above it, employing a direct top-to-bottom connection structure—a clever design that facilitates subsequent injection molding operations. Next, a first and second connecting injection tube are respectively positioned on the inner side of the shoe last, forming angles of 60 degrees and 80 degrees with the bottom of the shoe last, respectively. Compared to existing structures that feed material from the rear, the shorter lengths of the first and second connecting injection tubes further reduce the flow distance and time of the injection material, maximizing the temperature of the injection material, increasing molding speed, and improving adhesion. Finally, the increased angle between the first and second connecting injection tubes and the bottom of the shoe last, making them more vertical, also facilitates the flow of the injection material, further improving injection efficiency and quality. This invention boasts a novel and ingenious structure, employing a dual-channel design and structural improvements that enhance the injection and flow of the injection material, ensuring sole quality and making it suitable for widespread adoption.

[0028] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial improvements made to this utility model using this concept should be considered as infringing on the protection scope of this utility model.

Claims

1. A shoe last for injection molding of a double-channel continuous upper sole, characterized in that: The shoe includes a bottom mold, a shoe last, and an injection molding assembly. The bottom mold has an upward-opening sole mold in the middle. The shoe last is correspondingly positioned above the sole mold and can move up and down. The top of the shoe last has an inlet. The bottom front and rear sides of the shoe last have a first outlet and a second outlet, respectively. A first connecting injection molding tube is provided between the inlet and the first outlet. A second connecting injection molding tube is provided between the inlet and the second outlet. The injection molding assembly is positioned above the shoe last.

2. The shoe last for injection molding of a dual-channel continuous upper sole according to claim 1, characterized in that: The top of each shoe last is provided with a positioning sliding plate.

3. The shoe last for injection molding of a dual-channel continuous upper sole according to claim 1, characterized in that: Both the first and second connected injection molding tubes are straight-through tube structures.

4. The shoe last for injection molding of a dual-channel continuous upper sole according to claim 1, characterized in that: The feed inlet has a cylindrical structure, and the injection molding assembly has an injection head adapted to fit at the bottom, which is movably embedded in the cylindrical structure.

5. The shoe last for injection molding a double-channel continuous upper sole according to claim 1, characterized in that: The shoe sole mold has a front injection channel and a rear injection channel on the top front and rear sides, respectively, and the front injection channel and the rear injection channel are respectively set to correspond to the first discharge port and the second discharge port.

6. The shoe last for injection molding of a double-channel continuous upper sole according to claim 1, characterized in that: The angle between the upper part of the first connecting injection molding tube and the bottom of the shoe last is 60 degrees, and the angle between the upper part of the second connecting injection molding tube and the bottom of the shoe last is 80 degrees.

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