elastic sleeve

Abstract

This invention provides an elastic mold sleeve, the inner surface of which forms a cavity with a mandrel inserted inside. A shielding tube colloid is injected into the cavity and cured to form a shielding tube with no mold seam on its outer surface. The elastic mold sleeve and the shielding tube colloid are two incompatible materials, and the elastic mold sleeve is a soft elastomer to facilitate peeling from the shielding tube. This invention replaces traditional parting molds, resulting in a shielding tube with no mold seam on its outer surface, eliminating the need for flash polishing and preventing quality problems and potential accidents such as discharge and breakdown caused by polishing. The use of a material incompatible with the shielding tube colloid in the elastic mold sleeve satisfies the requirements for forming the shielding tube and facilitates subsequent peeling. Furthermore, the elastic mold sleeve of this invention is reusable, and the resulting shielding tube, intermediate joint prefabrication body, and intermediate joint are of high quality and safe to use.

Description

Technical Field

[0001] This invention relates to the field of seamless manufacturing technology, and in particular to an elastic mold sleeve for seamless molding. Background Technology

[0002] This section is intended to provide background or context for embodiments of the invention as set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] Domestic cable accessory products have gradually matured. The main insulating components are molded using silicone and EPDM materials. The molding process typically involves: first, forming conductive cones and conductive tubes using a parting mold; then assembling them into the mold and injecting insulating adhesive; after injection, heating and curing in an oven or clamping fixture; and finally, demolding and removing burrs to obtain a qualified product. The molds for the conductive cones and conductive tubes are parting molds, resulting in a lot of burrs after molding, especially in the connector shielding tube (conductive tube). Grinding these burrs is an essential step. However, because silicone is relatively soft and elastic, grinding is difficult. It's challenging to remove the burrs completely while maintaining the required shape and performance of the product. For example, sometimes, in order to clean the burrs, the surrounding tissue is also ground away, resulting in partial depressions after grinding. It's also possible that burr protrusions cannot be completely removed during grinding. Incomplete burr removal can cause the connector to discharge under the influence of an electric field, ultimately leading to product breakdown. Summary of the Invention

[0004] In view of the above, it is necessary to provide an elastic mold sleeve for manufacturing shielding tubes without flash or mold seams, which can effectively improve the pass rate of shielding tubes and effectively prevent potential safety accidents.

[0005] The technical solution provided by the present invention is as follows: an elastic sleeve, wherein the inner surface of the elastic sleeve and the core rod inserted inside it form a cavity, and a shielding tube colloid is injected into the cavity and cured to form a shielding tube with no mold seam on the outer surface. The elastic sleeve and the shielding tube colloid are two incompatible materials, and the elastic sleeve is a soft elastomer to achieve peeling from the shielding tube.

[0006] Furthermore, the elastic sleeve is EPDM, and its performance meets the following conditions when in use:

[0007]

[0008] Furthermore, the elastic sleeve comprises, by mass parts:

[0009]

[0010] Furthermore, the filler comprises one or more combinations of kaolin, talc, silica, calcium carbonate, and diatomaceous earth.

[0011] Furthermore, the peroxide vulcanizing agent includes one or more combinations of DCP, BPO, BPMC, DBPMH, and BIPB.

[0012] Furthermore, the active agent includes one or more combinations of stearic acid, linoleic acid, and oleic acid.

[0013] Furthermore, the oil includes one or more combinations of white oil, naphthenic oil, and transformer oil.

[0014] Furthermore, the elastic sleeve is made of silicone or fluoropolymer, and its performance meets the following conditions during use:

[0015]

[0016]

[0017] Furthermore, the elastic sleeve can be reused multiple times.

[0018] Furthermore, the elastic sleeve is sleeve-shaped, with a smooth and seamless inner surface, and the ends contract inwards towards the inner surface.

[0019] Compared with existing technologies, this invention provides an elastic mold sleeve, the inner surface of which forms a cavity with a mandrel inserted inside. A shielding tube colloid is injected into the cavity and cured to form a shielding tube with no mold seam on its outer surface. The elastic mold sleeve and the shielding tube colloid are two incompatible materials, and the elastic mold sleeve is a soft elastomer to facilitate peeling from the shielding tube. This invention replaces the traditional parting mold, resulting in a shielding tube with no mold seam on its outer surface, eliminating the need for flash polishing and preventing quality problems and potential accidents such as discharge and breakdown caused by polishing. The use of a material incompatible with the shielding tube colloid in the elastic mold sleeve satisfies the requirements for forming the shielding tube and facilitates subsequent peeling. Furthermore, the elastic mold sleeve of this invention is reusable, has a high utilization rate, and produces shielding tubes, intermediate joint prefabricated bodies, and intermediate joints of high quality and safe use. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of the elastic mold sleeve in one embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] none.

[0024] The following detailed description, in conjunction with the accompanying drawings, further illustrates the embodiments of the present invention. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the features in the embodiments of this application can be combined with each other.

[0026] The following description sets forth numerous specific details to provide a thorough understanding of the embodiments of the present invention. The described embodiments are only a part of, and not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the embodiments of the present invention.

[0027] In this article, "DCP" refers to dicumyl peroxide.

[0028] In this article, "BPO" refers to benzoyl peroxide (also known as benzyl peroxide or benzyl superoxide).

[0029] In this article, "BPMC" refers to 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane.

[0030] In this article, "DBPMH" refers to 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

[0031] In this article, "BIPB" refers to 1,3-bis(tert-butylperoxyisopropyl)benzene.

[0032] In this article, "EPDM" refers to ethylene-propylene-diene monomer, which is a terpolymer of ethylene, propylene, and a non-conjugated diene.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the invention pertain. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention.

[0034] Please see Figure 1The present invention provides an elastic sleeve, the inner surface of which forms a cavity with a mandrel inserted inside it. A shielding tube colloid is injected into the cavity and cured to form a shielding tube with no mold seam on the outer surface. The elastic sleeve and the shielding tube colloid are two incompatible materials, and the elastic sleeve is a soft elastomer to achieve peeling from the shielding tube.

[0035] Figure 1 The elastic sleeve is shown to be cylindrical, with its ends tapering inwards towards the inner surface. In this embodiment, the inner surface is smooth and seamless. The elastic sleeve can be fitted onto the mandrel, with its ends in contact with the mandrel. The inner surface and the outer surface of the mandrel form a closed cavity. The shielding tube adhesive is injected into this cavity through an injection port opened on one side of the mandrel. After heating, curing, cooling, and peeling off the elastic sleeve, the shielding tube can be prepared.

[0036] In embodiments of the present invention, the elastic sleeve can be reused multiple times, and the shielding tube colloid molding process does not damage the three-dimensional cross-linked structure of macromolecules in the elastic sleeve, thereby ensuring that the stability of the elastic sleeve is not affected. In embodiments of the present invention, the elastic sleeve and the shielding tube colloid are two incompatible materials, so the shielding tube colloid can be fully utilized for molding the shielding tube. In particular, it does not undergo chemical or physical reactions with the elastic sleeve, such as diffusion or adhesion, so the obtained shielding tube is free of impurities, has controllable quality, and is beneficial for subsequent separation, simplifying the molding steps.

[0037] In one specific embodiment, when the shielding tube colloid is silicone, the elastic sleeve is EPDM, and its performance meets the following conditions during use:

[0038]

[0039] The elastic sleeve comprises, by mass parts:

[0040] 100 copies of EPDM;

[0041] 25-100 parts of filler; The filler includes one or more combinations of kaolin, talc, silica, calcium carbonate, and diatomaceous earth.

[0042]

[0043] Example 1

[0044] The elastic sleeve comprises, by weight parts:

[0045]

[0046] Made like Figure 1 The elastic sleeve shown has the following properties:

[0047]

[0048] In addition, its vulcanization temperature is 150℃.

[0049] Example 2

[0050] The elastic sleeve comprises, by weight parts:

[0051]

[0052] Made like Figure 1 The elastic sleeve shown has the following properties:

[0053]

[0054] In addition, its vulcanization temperature is 160℃.

[0055] In other embodiments, the filler may be one of talc, silica, and calcium carbonate, or a combination of kaolin, talc, silica, calcium carbonate, and diatomaceous earth; its mass fraction may be any value between 25-30 parts, 30-90 parts, and 90-100 parts, such as 25 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 95 parts, and 100 parts, etc.; in other embodiments, the mass fraction of zinc oxide may be any value within the range of 3-4 parts and 4-5 parts, such as 3 parts, 3.5 parts, and 4.5 parts, etc.; in other embodiments, the activator may be a combination of linoleic acid, oleic acid, stearic acid, linoleic acid, and oleic acid; its mass fraction is not limited to 1 part, but may be any value between 0.5-1 part and 1-1.5 parts, including the minimum and maximum values. In other embodiments, the oil may be naphthenic oil, transformer oil, or a combination of white oil, naphthenic oil, and transformer oil; its mass fraction is not limited to 20 parts or 50 parts, but can be any value between 5 and 50 parts. In other embodiments, the peroxide curing agent may be one of BPO, BPMC, DBPMH, and BIPB, or a combination of DCP, BPO, BPMC, DBPMH, and BIPB; its mass fraction is not limited to 3 parts, but can be any value between 2 and 4 parts. The actual mass fractions of the above-mentioned components are not limited to those in Examples 1 and 2. As long as the properties of the EPDM elastic molded sleeve obtained meet the following requirements: Shore hardness 45-70°; elongation 250-600%; tensile strength 5-8 MPa; tear strength 15-25 kN / m, it can be used for the preparation and molding of silicone shielding tubes. Moreover, fluororubber elastic molded sleeves that meet the above properties can also be used to prepare silicone shielding tubes because EPDM, fluororubber and silicone are incompatible. Furthermore, through composition and performance design, elastic molded sleeves are used to assist in the molding of silicone shielding tubes (the elastic molded sleeves can be used at the curing temperature of silicone without undergoing qualitative changes, thus allowing for reuse).

[0056] In another specific embodiment, when the shielding tube is EPDM, the elastic sleeve is made of silicone or fluoropolymer. Similarly, through material design, the elastic sleeve is used to assist in the molding of the EPDM shielding tube (the elastic sleeve can be used at the curing temperature of the EPDM shielding tube without undergoing qualitative change, thus allowing for repeated use). The improved elastic sleeve must meet the following performance conditions:

[0057]

[0058] In summary, the inner surface of the elastic mold sleeve of the present invention is smooth and seamless, and the outer surface of the shielding tube in the shielding tube or insulating part formed by it has no mold gap and no flash, saving processes and materials; the final formed intermediate joint has good performance and is safe to use.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the embodiments of the present invention have been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the embodiments of the present invention should not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elastic mold sleeve, characterized in that: The inner surface of the elastic sleeve and the outer surface of the mandrel inserted inside it form a cavity. The shielding tube adhesive is injected into the cavity through the glue injection port opened on one side of the mandrel and cured to form a shielding tube with no mold seam on the outer surface. The elastic sleeve and the shielding tube adhesive are two incompatible materials, and the elastic sleeve is a soft elastomer to achieve peeling from the shielding tube. The elastic sleeve is cylindrical with a smooth, seamless inner surface and its ends contract inwards from the inner surface.

2. The elastic sleeve according to claim 1, characterized in that, The elastic sleeve is made of EPDM, and its performance meets the following conditions during use:

3. The elastic sleeve according to claim 2, characterized in that, The elastic sleeve comprises, by weight parts:

4. The elastic sleeve according to claim 3, characterized in that: The filler includes one or more combinations of kaolin, talc, silica, calcium carbonate, and diatomaceous earth.

5. The elastic sleeve according to claim 3, characterized in that: The peroxide vulcanizing agent includes one or more combinations of DCP, BPO, BPMC, DBPMH, and BIPB.

6. The elastic sleeve according to claim 3, characterized in that: The active agent includes one or more combinations of stearic acid, linoleic acid, and oleic acid.

7. The elastic sleeve according to claim 3, characterized in that: The oil includes one or more of the following: white oil, naphthenic oil, and transformer oil.

8. The elastic sleeve according to claim 1, characterized in that: The elastic sleeve is made of silicone or fluoropolymer, and its performance meets the following conditions during use:

9. The elastic sleeve according to claim 2 or 8, characterized in that: The elastic sleeve can be reused multiple times.

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