A semi-shaping device for sealing gaskets

Abstract

This utility model discloses a semi-shaping device for sealing gaskets, relating to the technical field of shaping devices. It includes an inner ring mold, an outer ring mold, and heating channels. Both the inner and outer ring molds have heating channels. Cavity surfaces are provided on the outer side of the inner ring mold and the inner side of the outer ring mold. The cavities on the two cavity surfaces can be joined to form a sealing gasket cavity. Two heating channels are located on either side of the sealing gasket cavity, heating the sealing gasket. The inner and outer ring molds are closed by pressure. This utility model enables the sheet rubber substrate to be coated with polytetrafluoroethylene to form a whole, allowing for a certain degree of shaping to achieve the desired design shape, facilitating subsequent compression molding and vulcanization. It is convenient to operate and improves work efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of shaping devices, and in particular to a semi-shaping device for sealing gaskets. Background Technology

[0002] A plate heat exchanger is a new type of high-efficiency heat exchanger composed of a series of corrugated metal plates stacked together. Thin rectangular channels are formed between the plates, allowing heat exchange to occur. Plate heat exchangers are ideal for liquid-liquid and liquid-vapor heat exchange, featuring high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, easy installation and cleaning, wide application, and long service life. The sealing between each plate in a plate heat exchanger is achieved by gaskets between the two metal plates, typically made of ethylene propylene diene monomer (EPDM), nitrile butadiene rubber (NBR), or fluororubber.

[0003] With technological advancements and increasing demands for energy conservation and emission reduction in chemical enterprises, the pressure-bearing capacity of plate heat exchangers has gradually improved, leading to their replacement of some shell-and-tube heat exchangers in these facilities. However, certain operating conditions can cause corrosion and swelling of ethylene propylene diene monomer (EPDM), nitrile butadiene rubber (NBR), and fluororubber materials, thus limiting the application of plate heat exchangers. Coating a rubber substrate with polytetrafluoroethylene (PTFE) has become an effective solution to this problem. However, the PTFE substrate is relatively hard, making it difficult to coat it with EPDM and directly mold and vulcanize it in a mold. Utility Model Content

[0004] The purpose of this invention is to provide a semi-shaping device for sealing gaskets to solve the problems existing in the prior art, making it convenient to coat the rubber substrate with polytetrafluoroethylene and improving work efficiency.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a semi-shaping device for a sealing gasket, including an inner ring mold, an outer ring mold, and heating channels. The heating channels are provided in both the inner and outer ring molds. Cavity surfaces are provided on the outer side of the inner ring mold and the inner side of the outer ring mold. The cavities on the two cavity surfaces can be joined to form a sealing gasket cavity. The two heating channels are located on opposite sides of the sealing gasket cavity, and the heating channels can heat the sealing gasket. The inner ring mold and the outer ring mold are closed by pressure.

[0007] Preferably, each of the heating channels is provided with an electric heating tube, and each of the electric heating tubes is communicatively connected to a temperature controller.

[0008] Preferably, the temperature controller can control each of the electric heating elements to be between 40°C and 80°C.

[0009] Preferably, the inner ring mold is an integral closed ring, and a plurality of heating channels are evenly distributed inside the inner ring mold.

[0010] Preferably, the outer ring mold is divided into several outer ring mold pieces according to the shape of the sealing gasket. Each of the outer ring mold pieces can be spliced ​​into a closed ring mold that matches the inner ring mold, and each of the outer ring mold pieces is provided with a heating channel.

[0011] Preferably, the heating channel is 3mm-10mm away from the cavity of the sealing gasket.

[0012] Preferably, both the inner ring mold and the outer ring mold are made of stainless steel or cast iron.

[0013] Preferably, the cross-sectional shape of the sealing gasket cavity is irregular, the irregular shape includes two oppositely arranged arcs and two oppositely arranged straight lines, and adjacent arcs and straight lines are connected. The openings of the two arcs are arranged in the same direction and are located in the inner ring mold and the outer ring mold respectively, so that the two straight lines are in a horizontal state.

[0014] Preferably, the inner ring mold has a plurality of positioning blocks on its inner side, the positioning blocks being used to ensure the shape of the inner ring mold.

[0015] Preferably, the outer ring mold is connected to several translational pressurizing mechanisms, which are electric push rods, hydraulic rods or pneumatic rods, and the translational pressurizing mechanisms can apply a pressure of 2 MPa-5 MPa perpendicular to the sealing gasket cavity.

[0016] The present invention achieves the following technical advantages over the prior art:

[0017] This invention enables the sheet rubber substrate to be coated with polytetrafluoroethylene to form a whole, which can be shaped to a certain extent to achieve the design required shape, making it convenient for subsequent molding and vulcanization. It is easy to operate and can improve work efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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 these drawings without creative effort.

[0019] Figure 1This is a schematic diagram of the semi-shaping device for the sealing gasket in Embodiment 1 of this utility model;

[0020] Figure 2 This is Embodiment 1 of the present utility model. Figure 1 Schematic diagram of the AA section structure;

[0021] In the diagram: 1-Inner ring mold, 2-Outer ring mold piece, 3-Heating channel, 4-Sealing gasket cavity, 5-Positioning block, 6-Transfer and pressurization mechanism. Detailed Implementation

[0022] 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.

[0023] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "clockwise," and "counterclockwise," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] The purpose of this invention is to provide a semi-shaping device for sealing gaskets to solve the problems existing in the prior art, making it convenient to coat the rubber substrate with polytetrafluoroethylene and improving work efficiency.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] like Figures 1 to 2 As shown, this embodiment provides a semi-shaping device for a sealing gasket, including an inner ring mold 1, an outer ring mold, and heating channels 3. Heating channels 3 are provided inside both the inner ring mold 1 and the outer ring mold. Cavity surfaces are provided on the outer side of the inner ring mold 1 and the inner side of the outer ring mold. The cavities on the two cavity surfaces can be spliced ​​together to form a sealing gasket cavity 4. Two heating channels 3 are located on both sides of the sealing gasket cavity 4, respectively, and the heating channels 3 can heat the sealing gasket. The inner ring mold 1 and the outer ring mold are closed by pressure. This embodiment enables the sheet rubber substrate to be coated with polytetrafluoroethylene to form a whole, allowing for a certain degree of shaping to achieve the desired design shape, facilitating subsequent compression molding and vulcanization. The operation is convenient and improves work efficiency.

[0029] As an optional solution, each heating channel 3 in this embodiment is equipped with an electric heating tube, and each electric heating tube is connected to a temperature controller for easy temperature control and to avoid excessive temperature from damaging the material properties.

[0030] As an optional solution, in this embodiment, the temperature controller can control each electric heating element to be between 40℃ and 80℃. Heating softens the sealing gasket formed by the two materials, which is beneficial for deformation and shaping.

[0031] As an optional solution, in this embodiment, the inner ring mold 1 is an integral closed ring, which facilitates the shaping of the sealing gasket. The inner ring mold 1 has several heating channels 3 evenly distributed inside, which facilitates deformation.

[0032] As an optional solution, in this embodiment, the outer ring mold is divided into several outer ring mold pieces 2 according to the shape of the sealing gasket. Each outer ring mold piece 2 can be spliced ​​into a closed ring mold that matches the inner ring mold 1. Each outer ring mold piece 2 is provided with a heating channel 3. By heating, the sealing gasket formed by the two materials can be deformed more quickly, which facilitates extrusion and shaping.

[0033] As an optional solution, in this embodiment, the heating channel 3 is 3mm-10mm away from the sealing gasket cavity.

[0034] As an optional solution, in this embodiment, both the inner ring mold 1 and the outer ring mold are made of stainless steel or cast iron.

[0035] As an optional solution, in this embodiment, the cross-sectional shape of the sealing gasket cavity 4 is irregular, which includes two oppositely arranged arcs and two oppositely arranged straight lines, and adjacent arcs and straight lines are connected to form a U-shape with side openings closed by arcs. The cavity in the inner ring mold 1 is larger to accommodate the two covered materials, while the cavity in the outer ring mold 2 is smaller and the arcs are convex to facilitate the extrusion of the materials. The two arc openings are arranged in the same direction and are located in the inner ring mold 1 and the outer ring mold respectively, so that the two straight lines are in a horizontal state.

[0036] As an optional solution, in this embodiment, a number of positioning blocks 5 are provided on the inner side of the inner ring mold 1. The positioning blocks 5 are used to ensure the shape and position of the inner ring mold 1, and at the same time facilitate the compression and closure with the outer ring mold.

[0037] As an optional solution, in this embodiment, several translational pressurizing mechanisms 6 are connected to the outer ring mold. The translational pressurizing mechanism 6 is an electric push rod, a hydraulic rod, or a pneumatic rod. The translational pressurizing mechanism 6 can apply a pressure of 2 MPa to 5 MPa perpendicular to the sealing gasket cavity 4. The translational pressurizing mechanism 6 is arranged opposite to the positioning block 5 to ensure that the inner ring mold 1 and the outer ring mold will not deform during the pressurization process.

[0038] Example 2

[0039] This embodiment provides a process for pre-shaping a polytetrafluoroethylene (PTFE) sheet over an ethylene propylene diene monomer (EPDM) substrate using the apparatus described in Embodiment 1. The specific operation process is as follows:

[0040] First, apply adhesive to the inside of the PTFE sheet; after the adhesive dries, it is wrapped around the surface of the PTFE substrate extruded by the extruder. The two coated materials are then loaded into the cavity of the inner ring mold 1, and the inner ring mold 1 is fixed on the operating platform. The outer ring molds are manually or automatically pushed inward using the translational pressure mechanism 6 to close the cavity. Then, the electric heating tubes in the heating channels 3 of the inner and outer ring molds are energized and heated to the required temperature (40℃-80℃). The heating time is generally controlled between 1 minute and 10 minutes. Pressure is then applied to the sealing gasket cavity 4, with an applicable pressure of 2 MPa-5 MPa, and the pressure application time is generally controlled between 5 minutes and 10 minutes. Under the combined action of pressure and temperature, the EPDM substrate and PTFE sheet will be shaped into the required design shape, ensuring that they do not delaminate or peel. This makes subsequent molding and vulcanization processes much easier.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A gasket semi-forming apparatus characterized by: The device includes an inner ring mold, an outer ring mold, and heating channels. The heating channels are provided in both the inner ring mold and the outer ring mold. Cavity surfaces are provided on the outer side of the inner ring mold and the inner side of the outer ring mold. The cavities on the two cavity surfaces can be spliced ​​to form a sealing gasket cavity in the shape of the sealing gasket. The two heating channels are located on both sides of the sealing gasket cavity, and the heating channels can heat the sealing gasket. The inner ring mold and the outer ring mold are closed by pressure.

2. The gasket semi-forming apparatus of claim 1, wherein: Each of the heating channels is equipped with an electric heating element, and each electric heating element is communicatively connected to a temperature controller.

3. The gasket semi-forming apparatus of claim 2, wherein: The temperature controller can control each of the electric heating elements to be between 40°C and 80°C.

4. The gasket semi-forming apparatus of claim 1, wherein: The inner ring mold is a complete closed ring, and several heating channels are evenly distributed inside the inner ring mold.

5. The gasket semi-forming apparatus of claim 1, wherein: The outer ring mold is divided into several outer ring mold pieces according to the shape of the sealing gasket. Each of the outer ring mold pieces can be spliced ​​into a closed ring mold that matches the inner ring mold, and each of the outer ring mold pieces is provided with a heating channel.

6. The sealing gasket semi-shaping device according to claim 1, characterized in that: The heating channel is 3mm-10mm away from the cavity of the sealing gasket.

7. The gasket semi-forming apparatus of claim 1, wherein: Both the inner ring mold and the outer ring mold are made of stainless steel or cast iron.

8. The gasket semi-forming apparatus of claim 1, wherein: The cross-sectional shape of the sealing gasket cavity is irregular, which includes two oppositely arranged arcs and two oppositely arranged straight lines. Adjacent arcs and straight lines are connected. The openings of the two arcs are arranged in the same direction and are located in the inner ring mold and the outer ring mold, respectively, so that the two straight lines are in a horizontal state.

9. The gasket semi-forming apparatus of claim 1, wherein: The inner ring mold has several positioning blocks on its inner side, which are used to ensure the shape of the inner ring mold.

10. The gasket semi-forming apparatus of claim 1, wherein: The outer ring mold is connected to several translational pressurization mechanisms, which are electric push rods, hydraulic rods or pneumatic rods. The translational pressurization mechanisms can apply a pressure of 2 MPa to 5 MPa perpendicular to the sealing gasket cavity.

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