A sealing structure between a mold frame and a foaming device during EPP foaming

Abstract

The present invention relates to a sealing structure between a mold frame and a foaming device during an EPP foaming process, the sealing structure comprising a sealing strip installation cavity arranged at the bottom of the mold frame, a foaming device plane arranged below the mold frame, and a fixed sealing strip arranged in the sealing strip installation cavity and adapted to the foaming device plane, the fixed sealing strip comprising a vertical portion arranged in the sealing strip installation cavity along a vertical direction, a horizontal portion arranged at one side of the top of the vertical portion along a horizontal direction, and an inclined portion arranged at one side of the bottom of the vertical portion along an inclined direction and in contact with the foaming device plane. Compared with the prior art, the present invention solves the problem of leakage of steam, compressed air, and cooling water between the mold frame and the foaming device plane during the EPP foaming production process by designing a specially shaped fixed sealing strip and a corresponding sealing structure, thereby making the production process more stable, ensuring product quality, and greatly improving production efficiency and reducing energy consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparation of foaming materials, and relates to a sealing structure between a mold frame and a foaming device during the EPP foaming process. Background Art

[0002] Currently, during the EPP (expanded polypropylene) foaming and molding process, a circular sealing strip 1 as shown in Figure 1 is mainly used for sealing between the mold frame and the plane of the foaming device. As shown in Figure 2 When the circular sealing strip 1 is assembled to the bottom of the mold frame 2, it is completely fixed by the deformation of the circular sealing strip 1 with interference fit to seal the gap between the plane 3 of the foaming device and the mold frame 2. However, in the actual production process, since the high-pressure steam, compressed air, and water used will cause the circular sealing strip 1 to deform under pressure, in the case of interference fit assembly, the service life of the circular sealing strip 1 during use is very short, and the biggest problem is that due to the shape deformation of the circular sealing strip 1, steam, compressed air, and water will leak from the gap between the mold frame 2 and the plane 3 of the foaming device, affecting the normal production process. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the above-mentioned existing technologies and provide a sealing structure between a mold frame and a foaming device during the EPP foaming process.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A sealing structure between a mold frame and a foaming device during the EPP foaming process, the sealing structure includes a sealing strip installation cavity provided at the bottom of the mold frame, a plane of the foaming device provided below the mold frame, and a clamping type sealing strip provided in the sealing strip installation cavity and adapted to the plane of the foaming device. The clamping type sealing strip includes a vertical portion provided in the sealing strip installation cavity along the vertical direction, a horizontal portion provided at one side of the top of the vertical portion along the horizontal direction, and an inclined portion provided at one side of the bottom of the vertical portion along the inclined direction and in contact with the plane of the foaming device. The clamping type sealing strip is clamped in the sealing strip installation cavity in a clamping manner and seals the gap between the plane of the foaming device and the mold frame. The horizontal portion and the vertical portion ensure the stable installation of the clamping type sealing strip in the sealing strip installation cavity. The inclined portion can not only seal the gap between the plane of the foaming device and the mold frame, but also play a guiding role because its inclined direction is adapted to the entering direction of fluids such as steam, compressed air, and water, improving the stress condition of the clamping type sealing strip when it is affected by fluids such as steam, compressed air, and water.

[0006] Furthermore, the bottom of the inclined portion is in contact with the plane of the foaming device.

[0007] Further, one end of the inclined portion is fixedly connected to the vertical portion, and a fluid inlet is provided between the other end and the inner wall of the sealing strip installation cavity. Fluids such as steam, compressed air, and water can enter the sealing strip installation cavity through the fluid inlet.

[0008] Further, one end of the inclined portion located at the vertical portion is higher than one end of the inclined portion located at the fluid inlet.

[0009] Further, a fluid retention cavity is formed among the bottom surface of the horizontal portion, the side surface of the vertical portion, and the top surface of the inclined portion, and the fluid retention cavity is communicated with the fluid inlet. Fluids such as steam, compressed air, and water entering through the fluid inlet stay in the fluid retention cavity and exert a pressure on the clamping sealing strip from the inside to the outside, enhancing the sealing effect of the clamping sealing strip.

[0010] Further, the transition among the bottom surface of the horizontal portion, the side surface of the vertical portion, and the top surface of the inclined portion is smooth.

[0011] Further, one side of the top of the vertical portion is fixedly connected to the horizontal portion, and a fixing rib is provided on the other side of the top. The fixing rib facilitates fixing the clamping sealing strip in the sealing strip installation cavity by clamping.

[0012] Further, a fixing rib installation cavity adapted to the fixing rib is provided in the sealing strip installation cavity. The fixing rib installation cavity limits the fixing rib, making the installation more convenient.

[0013] Further, the clamping sealing strip is a rubber sealing strip. The rubber sealing strip has a certain elastic deformation ability, which is convenient for improving the sealing effect.

[0014] In the present invention, after the clamping sealing strip is installed in the sealing strip installation cavity and cooperates with the mold frame and the plane of the foaming equipment, when energy fluids such as steam, compressed air, and cooling water generate pressure on the clamping sealing strip during the production process, these fluids will enter the fluid retention cavity through the fluid inlet. Since these fluids are all pressurized, they will exert pressure on the inner wall of the clamping sealing strip. At the same time, because the clamping sealing strip is made of rubber material, a sealed annular body is formed between the mold frame and the plane of the foaming equipment, avoiding the problem of energy leakage during the production process.

[0015] Compared with the prior art, the present invention has the following characteristics:

[0016] 1) By designing a clamping sealing strip with a special shape and a corresponding sealing structure, the leakage problems of steam, compressed air, and cooling water between the mold frame and the plane of the foaming equipment during the EPP foaming production process are solved, making the production process more stable, ensuring the product quality, significantly improving the production efficiency, and reducing the energy consumption;

[0017] 2) Since the snap-in seal strip adopts a snap-in installation method and does not use interference fit, the assembly is easier, reducing the installation difficulty of the seal strip; it uses high-temperature resistant rubber material, improving the service life and also saving the usage cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a circular seal strip in the prior art;

[0019] Figure 2 is a schematic structural diagram of the sealing structure between the mold frame and the foaming equipment plane in the prior art, where the arrow indicates the flow direction of steam, compressed air, and cooling water;

[0020] Figure 3 is a schematic structural diagram of the snap-in seal strip in the present invention;

[0021] Figure 4 is a schematic structural diagram of the sealing structure between the mold frame and the foaming equipment plane in the present invention, where the arrow indicates the flow direction of steam, compressed air, and cooling water;

[0022] Description of the marks in the figure:

[0023] 1 - circular seal strip, 2 - mold frame, 3 - foaming equipment plane, 4 - seal strip installation cavity, 5 - snap-in seal strip, 501 - vertical part, 502 - horizontal part, 503 - inclined part, 6 - fluid inlet, 7 - fluid retention cavity, 8 - fixing rib. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0025] Embodiment:

[0026] As Figure 4 shown, a sealing structure between the mold frame and the foaming equipment during the EPP foaming process includes a seal strip installation cavity 4 provided at the bottom of the mold frame 2, a foaming equipment plane 3 provided below the mold frame 2, and a snap-in seal strip 5 provided in the seal strip installation cavity 4 and adapted to the foaming equipment plane 3. As Figure 3 shown, the snap-in seal strip 5 includes a vertical part 501 provided in the seal strip installation cavity 4 in the vertical direction, a horizontal part 502 provided on one side of the top of the vertical part 501 in the horizontal direction, and an inclined part 503 provided on one side of the bottom of the vertical part 501 in the inclined direction and in contact with the foaming equipment plane 3.

[0027] Among them, the bottom of the inclined part 503 is in contact with the foaming equipment plane 3. One end of the inclined part 503 is fixedly connected to the vertical part 501, and a fluid inlet 6 is provided between the other end and the inner wall of the sealing strip installation cavity 4. One end of the inclined part 503 located at the vertical part 501 is higher than the end of the inclined part 503 located at the fluid inlet 6. A fluid retention cavity 7 is formed among the bottom surface of the horizontal part 502, the side surface of the vertical part 501, and the top surface of the inclined part 503, and the fluid retention cavity 7 is communicated with the fluid inlet 6. The bottom surface of the horizontal part 502, the side surface of the vertical part 501, and the top surface of the inclined part 503 are smoothly transitioned. One side of the top of the vertical part 501 is fixedly connected to the horizontal part 502, and a fixing rib 8 is provided on the other side of the top. A fixing rib installation cavity adapted to the fixing rib 8 is provided in the sealing strip installation cavity 4. The clamping type sealing strip 5 is a rubber sealing strip.

[0028] After the clamping type sealing strip 5 is installed in the sealing strip installation cavity 4 and cooperates with the mold frame 2 and the foaming equipment plane 3, when energy fluids such as steam, compressed air, and cooling water in the production process generate pressure on the clamping type sealing strip 5, these fluids will enter the fluid retention cavity 7 from the fluid inlet 6. Since these fluids are all pressurized, they will exert pressure on the inner wall of the clamping type sealing strip 5. At the same time, because the clamping type sealing strip 5 is made of rubber material, a sealed annular body is formed between the mold frame 2 and the foaming equipment plane 3, avoiding the problem of energy leakage in the production process.

[0029] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A sealing structure between a mold frame and a foaming device during EPP foaming, characterized in that: The sealing structure comprises a sealing strip installation cavity (4) arranged at the bottom of a mold frame (2), a foaming device plane (3) arranged below the mold frame (2), and a snap-on sealing strip (5) arranged in the sealing strip installation cavity (4) and adapted to the foaming device plane (3); the snap-on sealing strip (5) comprises a vertical portion (501) arranged in the sealing strip installation cavity (4) along a vertical direction, a horizontal portion (502) arranged on one side of the top of the vertical portion (501) along a horizontal direction, and an inclined portion (503) arranged on one side of the bottom of the vertical portion (501) along an inclined direction and in contact with the foaming device plane (3).

2. The sealing structure between the mold frame and the foaming equipment in the EPP foaming process according to claim 1, characterized in that: The bottom of the inclined portion (503) is in contact with the foaming equipment plane (3).

3. The sealing structure between the mold frame and the foaming equipment in the EPP foaming process according to claim 2, characterized in that: One end of the inclined portion (503) is fixedly connected to the vertical portion (501), and a fluid inlet (6) is provided between the other end and the inner wall of the sealing strip installation cavity (4).

4. The sealing structure between the mold frame and the foaming equipment in the EPP foaming process according to claim 3, characterized in that: The end of the inclined portion (503) located at the vertical portion (501) is higher than the end of the inclined portion (503) located at the fluid inlet (6).

5. The sealing structure between the mold frame and the foaming equipment in the EPP foaming process according to claim 3, characterized in that: The bottom surface of the horizontal portion (502), the side surface of the vertical portion (501), and the top surface of the inclined portion (503) form a fluid retention chamber (7), and the fluid retention chamber (7) is connected to the fluid inlet (6).

6. The sealing structure between the mold frame and the foaming equipment in the EPP foaming process according to claim 5, characterized in that: The bottom surface of the horizontal portion (502), the side surface of the vertical portion (501), and the top surface of the inclined portion (503) are smoothly transitioned.

7. The sealing structure between the mold frame and the foaming equipment in the EPP foaming process according to claim 1, characterized in that: One side of the top of the vertical portion (501) is fixedly connected to the horizontal portion (502), and the other side of the top is provided with a fixing rib (8).

8. The sealing structure between the mold frame and the foaming equipment in the EPP foaming process according to claim 7, characterized in that: A fixing rib installation cavity which is compatible with the fixing rib (8) is provided in the sealing strip installation cavity (4).

9. The sealing structure between the mold frame and the foaming equipment in the EPP foaming process according to claim 1, characterized in that: The clamping type sealing strip (5) is a rubber sealing strip.

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