A PU material feeding pipeline for shoemaking and a shoemaking device

Abstract

The utility model belongs to shoemaking equipment technical field, specifically disclose a kind of PU material's feeding pipeline for shoemaking and shoemaking equipment, including one "y" shape's three-way pipeline;"y" shape three-way pipeline is located below feed pump and feed inlet;Two openings in the top of "y" shape three-way pipeline are connected with feed pump and feed inlet respectively through metal pipeline;Valve is equipped at the opening below "y" shape three-way pipeline.The utility model can let PU material flow out from pipeline under the action of gravity when stopping, eliminates the risk of PU material retention in pipeline and causes blockage.The utility model is applicable to the feeding of PU material for shoemaking.

Description

Technical Field

[0001] This utility model belongs to the technical field of shoemaking equipment, and relates to a feeding pipe for PU material used in shoemaking and shoemaking equipment. Background Technology

[0002] In the current footwear industry, polyurethane (PU) has become a key material due to its unique molecular structure, which combines high elasticity, lightweight, and strong adhesion. Liquid PU can be cast into complex shoe sole structures, while hot-pressing processes can produce breathable insoles. Its compatibility with materials such as rubber and mesh far exceeds that of traditional materials like EVA. These properties make it a core raw material for shock-absorbing midsoles, high-end insoles, and outsole adhesives in athletic shoes, meeting the comprehensive needs of modern footwear for comfort, functionality, and production efficiency.

[0003] However, during shoe production, PU material is highly susceptible to solidification and agglomeration due to the reactive properties of isocyanate (-NCO) groups. Traditional feeding systems often fail to optimize the pipe design from the pump to the inlet for PU characteristics: right-angle bends in the pipes easily create dead zones for material collision; rough inner walls trap residual material, which solidifies when exposed to air during shutdowns; and the lack of a heating system makes the pipes a solidification bed in low-temperature environments, causing hygroscopic and agglomerated PU particles to continuously accumulate during transport, eventually forming a hardened layer with significantly increased flow resistance. This results in residual PU becoming the seed for future blockages after each shutdown.

[0004] Blockages caused by PU materials can lead to significant production losses. Forced unblocking generates a large amount of scrap material, and the introduction of solidified particles from new materials can cause defects such as air bubbles in shoe soles, significantly increasing the defect rate of shoes. Frequent high-pressure cleaning further accelerates pipe wall wear, creating a vicious cycle of "blockage-re-blockage," significantly increasing equipment maintenance costs. Therefore, a feeding pipe specifically designed for PU materials is needed to reduce the risk of blockages. Summary of the Invention

[0005] The purpose of this invention is to provide a feeding pipe for PU materials used in shoemaking. This invention allows the PU material to flow out of the pipe under the action of gravity when the machine is stopped, eliminating the risk of PU material remaining in the pipe and causing blockage.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A feeding pipe for PU material used in shoemaking includes a "Y"-shaped tee pipe; The "Y"-shaped tee pipe is located below the feed pump and the feed inlet; The two openings above the "Y"-shaped tee pipe are respectively connected to the feed pump and the feed inlet through metal pipes; A valve is installed at the opening below the "Y"-shaped tee pipe.

[0007] As a limitation, the outer wall of the metal pipe is provided with a heating device.

[0008] As a second limitation, the metal pipe is wrapped with an insulation layer.

[0009] As a third limitation, the inner wall of the metal pipe is a smooth inner wall.

[0010] A shoe-making device, wherein the shoe-making device is provided with a feeding pipe for the aforementioned PU material for shoe-making.

[0011] The technological advancements achieved by this invention compared to existing technologies, due to the adoption of the aforementioned technical solution, are as follows: (1) This utility model adopts a combination structure of "y" shaped three-way pipe and valve. When the valve is opened, the PU material is completely discharged by gravity, avoiding the problem of material residue solidification and caking caused by shutdown in traditional pipes, reducing the blockage rate when the equipment is restarted, and significantly improving production continuity. (2) In this utility model, the metal pipe combined with the heating system can stabilize the pipe wall temperature, prevent low-temperature solidification, eliminate the defective products caused by solidified particles mixed into the new material, improve the pipe life and reduce the overall maintenance cost of the equipment. (3) In this utility model, the inner wall of the metal pipe is a smooth inner wall, which can significantly reduce the friction when the PU material flows, so that the viscous material forms a stable laminar flow state. This not only eliminates the material retention phenomenon caused by the traditional rough pipe wall, but also reduces the mechanical wear of the pipe caused by high-pressure cleaning and extends the service life of the pipe.

[0012] This utility model belongs to the field of shoe manufacturing equipment technology. It can allow PU material to flow out of the pipe under the action of gravity when the machine is stopped, eliminating the risk of PU material remaining in the pipe and causing blockage. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0014] In the attached diagram: Figure 1 This is a schematic diagram of the "Y"-shaped tee pipe in Embodiment 1 of this utility model.

[0015] In the diagram: 1. A Y-shaped tee pipe; 2. A metal pipe. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] Example 1 like Figure 1 As shown, this embodiment is a feeding pipe for PU material used in shoemaking, including a "Y"-shaped tee pipe 1, which is located below the feed pump and the feed inlet. The two openings at the top of the "Y"-shaped tee pipe 1 are connected to the feed pump and the feed inlet respectively through metal pipes 2, and a valve is provided at the opening at the bottom of the "Y"-shaped tee pipe 1.

[0018] To prevent the PU material inside the metal pipe 2 from solidifying due to low temperature, a heating device is installed on the outer wall of the metal pipe 2, and an insulation layer is wrapped around the outside of the metal pipe 2. The heating device can be hot water heating or heat transfer oil heating. The insulation layer can be foam cotton or polyurethane insulation board.

[0019] To facilitate the discharge of PU material under gravity, the inner wall of metal pipe 2 is smooth.

[0020] In this embodiment, when the equipment is started, the valve is closed, and the feed pump transports the PU material to the metal pipe 2. The PU material first descends, then rises to the discharge port after passing through the "Y"-shaped tee pipe 1, thus realizing the material conveying process. When the equipment is not in use, the valve is opened, and the PU material in the metal pipe 2 will be discharged from the valve under the action of gravity, thereby eliminating the risk of solidification and blockage due to accumulation in the pipe.

[0021] In summary, this embodiment allows the PU material to be conveyed from bottom to top when the equipment is started; when the equipment is stopped, the PU material flows out of the pipe under the action of gravity, eliminating the risk of PU material remaining in the pipe and causing blockage. Example

[0022] This embodiment describes a shoe-making device, which includes a feeding pipe for PU material used in shoe making as described in Embodiment 1. In this embodiment, the shoe-making device can be an injection molding machine or a PU foaming machine.

Claims

1. A feeding pipe for PU material used in shoemaking, characterized in that, Includes a Y-shaped tee pipe; The "Y"-shaped tee pipe is located below the feed pump and the feed inlet; The two openings above the "Y"-shaped tee pipe are respectively connected to the feed pump and the feed inlet via metal pipes; A valve is installed at the opening below the "Y"-shaped tee pipe.

2. The PU material feeding pipe for shoemaking according to claim 1, characterized in that, The outer wall of the metal pipe is equipped with a heating device.

3. The PU material feeding pipe for shoemaking according to claim 1 or 2, characterized in that, The metal pipe is wrapped with an insulation layer.

4. The PU material feeding pipe for shoemaking according to claim 1 or 2, characterized in that, The inner wall of the metal pipe is smooth.

5. The feeding pipe for PU material used in shoemaking according to claim 3, characterized in that, The inner wall of the metal pipe is smooth.

6. A shoe manufacturing apparatus characterized by comprising: The shoe-making equipment is equipped with a feeding pipe for PU material used in shoe making as described in any one of claims 1 to 5.

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