Special wire coil for steam crosslinking

Abstract

The utility model discloses a special wire coil for steam crosslinking, and relates to the technical field of cable production. The utility model relates to a special wire coil for steam crosslinking, which comprises a wheel cylinder, side plates fixed on two sides of the wheel cylinder, and a central shaft hole nested in the wheel cylinder and coaxial with the wheel cylinder, a plurality of outer convex ribs which are distributed in a circular array by taking the central shaft hole as the center are arranged on the side plate; the outer convex ribs are provided with first long-strip-shaped holes distributed in the length direction of the outer convex ribs in an extending mode. The utility model designs the special wire coil for steam crosslinking, when the wire coil is adopted to carry out crosslinking reaction of an insulated wire core, steam can respectively pass through the second strip-shaped hole and the first strip-shaped hole at the wheel cylinder and the wheel side to quickly reach the lower part and the middle part of the wheel, and the insulated wire core can be ensured to be simultaneously and fully contacted with high-temperature steam, so that the overall crosslinking time is shortened; meanwhile, after the crosslinking time is shortened, the time of the mica tape and the stranded conductor in a high-temperature and high-humidity environment can be shortened, and the risk of oxidation discoloration of the conductor is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cable production, in particular to a special steam cross-linking reel. Background Art

[0002] XLPE insulated core is an important component of XLPE cable. When XLPE material is used as insulating core in cable, it needs to be cross-linked by heating and pressurizing to make the polyethylene molecular chains cross-linked with each other to form a three-dimensional network structure, thereby improving the thermal stability and electrical properties of the material.

[0003] The cross-linking reaction of XLPE materials is generally carried out in a steam cross-linking chamber. The cross-linking process of XLPE materials depends on temperature and time. The appropriate temperature can promote the cross-linking reaction and form a stable three-dimensional network structure. Insufficient temperature will lead to incomplete cross-linking, which will affect the physical and chemical properties of the core and may cause the XLPE material to produce uneven thermal expansion when heated, resulting in failure of the thermal expansion test.

[0004] Figure 1-2 As shown, a conventional wire drum currently used by the applicant in a steam cross-linking room; this wire drum includes a wheel drum 120, side panels 130 fixed on both sides of the wheel drum 120, and a central axis hole 110 nested in the wheel drum 120 and coaxially arranged with the wheel drum 120; the side panels 130 are provided with a plurality of external ribs 140 arranged in a circular array with the central axis hole 110 as the center.

[0005] Based on the needs of improving the working environment of the factory and expanding product output, the applicant renovated the previous steam cross-linking room, and the space of the steam cross-linking room became larger after the renovation; however, after the renovation of the steam cross-linking room, it was found that when the above-mentioned conventional wire drum was used to carry out the cross-linking reaction of XLPE material, under normal temperature and time conditions, the XLPE insulated wire core occasionally failed the under-wheel insulation thermal extension test; at the same time, after cross-linking the stranded conductor fire-resistant XLPE insulated wire core from May to August, the conductor would discolor.

[0006] In this regard, the inventor believes that how to solve the above technical problems by making small changes to the above conventional wire drum without changing the existing steam cross-linking room is a technical problem that urgently needs to be solved by technicians in this field.

[0007] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0008] In response to the above technical problems, an embodiment of the present invention provides a steam cross-linking dedicated wire drum to solve the problems raised in the above background technology.

[0009] The utility model provides the following technical solutions:

[0010] A steam cross-linking special reel comprises a drum, side plates fixed on both sides of the drum, and a central shaft hole nested in the drum and coaxially arranged with the drum;

[0011] The side panels are provided with a plurality of external convex ribs arranged in a circular array with the central shaft hole as the center;

[0012] The outer rib is provided with a first long hole extending along the length direction of the outer rib;

[0013] A plurality of second elongated holes extending along the axial direction of the wheel barrel are arranged at intervals on the wheel barrel.

[0014] Preferably, a plurality of steam flow holes are spaced apart on the side plate between the wheel barrel and the central shaft hole.

[0015] Preferably, the wheel drum is wrapped with thick felt.

[0016] Preferably, the wire reel is made of stainless steel.

[0017] A special steam cross-linking reel provided by an embodiment of the present invention has the following beneficial effects: the present invention designs a special steam cross-linking reel. When this reel is used to carry out the cross-linking reaction of the insulated wire core, the steam can quickly reach the bottom and the middle of the wheel through the second long holes and the first long holes on the wheel barrel and the wheel side respectively, which can ensure that the insulated wire core is simultaneously and fully exposed to high-temperature steam, thereby shortening the overall cross-linking time; at the same time, after the cross-linking time is shortened, the time that the mica tape and the twisted conductor are in a high-temperature and high-humidity environment can be reduced, greatly reducing the risk of oxidation and discoloration of the conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a conventional wire drum;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of a conventional wire drum;

[0020] Figure 3 This is a schematic structural diagram of a steam cross-linking dedicated wire drum in the present invention;

[0021] Figure 4 This is a schematic cross-sectional view of the steam cross-linking dedicated wire drum in the present invention;

[0022] Figure 5 This is a result diagram of the steam amount used in the steam cross-linking reaction before the renovation of the steam cross-linking room;

[0023] Figure 6 This is the result diagram of the steam amount used for steam cross-linking reaction after the steam cross-linking room was renovated. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] 1. Design Concept of This Patent

[0026] The study found that before the steam cross-linking room was renovated, a small warm water pool was used. Its internal space was small and the steam pressure was large. The high temperature and steam could be transmitted to the wheel in time. The insulation time was 3-4 hours, and the wheel upper and lower tests were qualified and stable.

[0027] After the steam cross-linking room was renovated, its internal space became larger and the internal steam pressure was low. Steam could only enter the wheel through the gap in the groove of the outer rib on the wheel side. If the wire core loading volume was higher than the gap position of the groove of the outer rib on the wheel side, it would be difficult for steam to enter the interior, and the cross-linking conditions would be insufficient, resulting in unqualified thermal elongation.

[0028] At the same time, the weather is hot and humid from May to August, and the mica tape and the conductor itself are prone to moisture. During steam cross-linking, the wire core is under high temperature and high humidity conditions. The longer the insulation time, the greater the risk of oxidation and discoloration of the conductor.

[0029] In this regard, the improvement purpose of the utility model is to increase the position and number of pores on the wire drum through which steam can smoothly enter under and in the wheel, ensuring that the insulated wire core can fully contact the high-temperature steam, thereby shortening the overall cross-linking time.

[0030] 2. Example 1: See Figure 1-4 .

[0031] In response to the problems mentioned in the above background technology, the embodiment of the present invention provides a steam cross-linking dedicated wire drum to solve the above technical problems. The technical solution is as follows:

[0032] A steam cross-linking dedicated wire drum comprises a drum 120, side plates 130 fixed to both sides of the drum 120, and a central axis hole 110 nested in the drum 120 and coaxially arranged with the drum 120; the central axis hole 110 is used to assemble the wire drum on a rotating bracket;

[0033] The side panel 130 is provided with a plurality of external ribs 140 arranged in a circular array with the central shaft hole 110 as the center. The external ribs 140 refer to ribs on the side panel 130 that protrude outward from the side panel 130 , and a groove 142 is formed inside the external ribs 140 .

[0034] The outer rib 140 is provided with first elongated holes 141 extending along the length direction of the outer rib 140;

[0035] The wheel drum 120 is provided with a plurality of second elongated holes 121 spaced apart and extending along the axial direction of the wheel drum 120 .

[0036] As a preferred embodiment of the present invention, a plurality of steam circulation holes 150 are arranged at intervals on the side plate 130 between the wheel drum 120 and the central axis hole 110; the provision of the steam circulation holes 150 can encourage steam to enter from the steam circulation holes 150 and overflow from the second long hole 121 to heat the insulated wire core.

[0037] As a preferred embodiment of the present invention, the wheel drum 120 is wrapped with thick felt; when the second long hole 121 is opened on the wheel drum 120, sharp corners and edges may appear on the edge of the opening; wrapping the wheel drum 120 with thick felt can prevent the second long hole 121 from directly contacting the insulated wire core and scratching the insulated wire core, and the thick felt also has good air permeability.

[0038] As a preferred embodiment of the present invention, the wire reel is made of stainless steel to prevent the wire reel from rusting.

[0039] 3. Example 2: See Table 1-2 and Figure 5-6 .

[0040] Three batches of wire cores have been cross-linked using a dedicated steam cross-linking reel, lowering the cross-linking temperature to 96°C and shortening the cross-linking time to 3 hours. Samples were taken from under, in, and above the wheel for insulation thermal extension in each round, and all were qualified. The insulation thermal extension results are shown in Table 1-2.

[0041] Table 1 Insulation thermal extension performance results

[0042] Test report (thermal extension)

[0043]

[0044] Table 2 Another insulation thermal extension performance results

[0045] Test report (thermal extension)

[0046]

[0047] It should be noted that after multiple adjustments and verifications, before the reel was modified, the insulation temperature determined during the cross-linking reaction was 98°C and the insulation time was 6 hours; under the above conditions, the insulation thermal extension performance was relatively stable.

[0048] After adopting the steam cross-linking special coil, the steam cross-linking time was shortened from 6 hours to 3 hours. The previous steam flow rate was 0.102m3 per 6 hours. 3 The current steam flow rate is 0.045m3 per 3 hours. 3 ; The results are as follows Figure 5-6 .

[0049] At the same time, shortening the cross-linking time can reduce the time that the mica tape and stranded conductor are in a high temperature and high humidity environment, greatly reducing the risk of conductor oxidation and discoloration.

[0050] A special steam cross-linking reel provided by an embodiment of the present invention has the following beneficial effects: the present invention designs a special steam cross-linking reel. When this reel is used to carry out the cross-linking reaction of the insulated wire core, the steam can quickly reach the bottom and the middle of the wheel through the second long holes and the first long holes on the wheel barrel and the wheel side respectively, which can ensure that the insulated wire core is simultaneously and fully exposed to high-temperature steam, thereby shortening the overall cross-linking time; at the same time, after the cross-linking time is shortened, the time that the mica tape and the twisted conductor are in a high-temperature and high-humidity environment can be reduced, greatly reducing the risk of oxidation and discoloration of the conductor.

[0051] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0052] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0053] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A steam cross-linking dedicated reel, comprising a drum, side plates fixed to both sides of the drum, and a central axis hole nested in the drum and coaxially arranged with the drum; characterized in that: The side panels are provided with a plurality of external convex ribs arranged in a circular array with the central shaft hole as the center; The outer rib is provided with a first long hole extending along the length direction of the outer rib; A plurality of second elongated holes extending along the axial direction of the wheel barrel are arranged at intervals on the wheel barrel.

2. The steam cross-linking dedicated wire drum according to claim 1, characterized in that: A plurality of steam flow holes are arranged at intervals on the side plate between the wheel barrel and the central shaft hole.

3. The steam cross-linking dedicated wire drum according to claim 1, characterized in that: The wheel barrel is covered with thick felt.

4. The steam cross-linking dedicated wire drum according to claim 1, characterized in that: The material of the wire reel is stainless steel.

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