CN109473218A - 一种露天煤矿用高压拖曳橡套软电缆 - Google Patents
一种露天煤矿用高压拖曳橡套软电缆 Download PDFInfo
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Abstract
本发明提供一种露天煤矿用高压拖曳橡套软电缆,包括缆芯,所述缆芯由动力线芯、接地导体及接地检测线芯绞合而成,缆芯外挤包外护套,在缆芯与外护套之间是编织加强层;所述的动力线芯为三根,是由动力线芯导体、绕包在动力线芯导体外的半导电带、依次挤包在半导电带外的内屏蔽层、动力线芯绝缘层、半导电外屏蔽层、金属屏蔽层构成。本发明电缆采用特种聚丙烯材料,克服了接地检测线芯易断的缺点。采用柔性加强结构和高强度、高抗撕、耐高低温的CPE橡胶护套,电缆弯曲性能好,耐频繁移动和频繁收线放线,提高了电缆的耐磨、耐腐蚀和抗拖曳的性能,增加了电缆的安全使用性能。
Description
技术领域
本发明涉及电线电缆领域,具体涉及一种露天煤矿用高压拖曳橡套软电缆。
背景技术
露天煤矿由于作业面较大,为了提高生产效率,在开采的时候,一般使用高电压、大功率的重型设备,因此一般的移动软电缆无法满足该类设备的需要。由于受高电压、大功率大型工程机械设备如露天煤矿常用的电铲子、挖泥机、挖斗机等的限制,该类设备用电缆需长期在施工地面拖拉,甚至需要经受设备的碾压,现有的高压移动橡皮电缆线芯容易打扭断芯、单层护套层没有加强结构,容易起鼓,使用寿命一般较短,增加了用户的使用成本;其次,现有的矿用拖曳移动电缆,由于电缆使用环境较为恶劣,电缆的绝缘线芯在长期的拖拉、碾压使用中容易出现绝缘损伤,接地检测线芯主要起到信号监控的作用,由于接地检测线芯是电缆中存在的最小的导线,张力、扭转、挤压和剪切所带来的机械压力对电缆的所有组件都会产生不利的影响,而这其中,接地检测线芯所承受的压力尤为严重,易导致接地检测线芯断裂,绝缘出现破损,如果接地检测线芯断芯,绝缘出现破损,当电缆主线芯出现损伤时无法及时的反馈到监视设备上,将失去监控保护作用,并造成设备停止转动,甚至造成设备的损坏,还有可能造成人员伤害,严重影响了用户的使用,给用户造成很大的损失。而该类电缆接地检测线芯易断芯、使用寿命短的问题,一直是困扰矿山行业和线缆行业的难题。
发明内容
为了解决上述技术问题,本发明提供一种接地检测线芯不易断芯且具有良好的抗扭曲性能的露天煤矿用高压拖曳橡套软电缆。
本发明的技术方案:
一种露天煤矿用高压拖曳橡套软电缆,包括缆芯,所述缆芯由动力线芯、接地导体及接地检测线芯绞合而成,缆芯外挤包外护套,在缆芯与外护套之间是编织加强层;所述的动力线芯为三根,是由动力线芯导体、绕包在动力线芯导体外的半导电带、依次挤包在半导电带外的内屏蔽层、动力线芯绝缘层、半导电外屏蔽层、金属屏蔽层构成。
所述的接地导体为两根,接地导体采用的是镀锡退火软铜导体,镀锡退火软铜导体单丝的直径范围为0.1~0.4mm。
所述的接地检测线芯为一根,是由接地检测导体以及挤包在接地检测导体外的接地检测线芯绝缘层构成。
所述的接地检测导体外径为4.4~8.4mm。
所述的接地检测线芯绝缘层为特种聚丙烯材料。
所述的接地检测线芯绝缘层厚度为1.2~1.6mm。
所述特种聚丙烯材料熔融指数为5.0~15.0g/10min,A120法测得的维卡软化点为130~150℃,0.45MPa下热变形温度为90~110℃,抗张强度为25~30MPa,100%定伸强度为18~23MPa。
所述编织加强层采用耐高温高强尼龙丝通过高速编织机编织而成,所述耐高温高强尼龙丝单丝直径范围为0.1~0.3mm。
所述外护套为CPE橡胶,所述CPE橡胶能长期耐温-40~65℃,所述CPE橡胶抗张最小值为18MPa,抗撕强度最小值为8N/mm。
与现有技术相比,本发明的有益效果是:
1、本发明的动力线芯的导体、接地检测导体及接地导体由多根退火的镀锡铜单线同向绞合而成,从而增强了动力线芯的导体、接地检测导体及接地导体的柔软性、抗扭耐弯曲性。
2、本发明设有耐高温高强尼龙丝,增加了本发明的强度,改善了本发明的柔软性,本发明受到弯曲和拉伸作用时,大部分作用力作用在耐高温高强尼龙丝上,铜导体受力就会减少,提高了本发明的抗拉伸能力和抗弯曲能力。
3、本发明的接地检测线芯绝缘层为特种聚丙烯材料,由于聚丙烯材料抗张强度非常大且表面非常光滑,从而提高了接地检测线芯的强度及与动力线芯之间的相对滑移性能,降低电缆频繁移动过程中受到的阻力,使接地检测线芯在受到张力、扭转、挤压和剪切所带来的机械压力时得到缓冲而不易断芯。
4、本发明的动力线芯金属屏蔽层为金属和纤维混合编织层,金属采用镀锡的退火铜单线,提高了金属和纤维混合编织层的柔软性,不易产生单线断丝现象。
5、本发明的动力线芯在绝缘屏蔽层与金属屏蔽层之间设有耐热半导体尼龙屏蔽带层,防止动力线芯的金属屏蔽层的单线断丝损伤绝缘层,提高了绝缘屏蔽层与金属屏蔽层之间的滑移性能。
6、本发明的保护套为外护套,外护套由高强度高抗撕耐-40~65℃阻燃CPE橡胶挤包而成,在缆芯与外护套之间设有交叉均匀编织的耐高温高强尼龙丝加强层,因在成缆过程中不加填充,缆芯边隙在挤制外护套时会被护套胶料填充圆整,编织加强层会嵌入外护套中,可以保证电缆在使用时具有较好的抗撕性和抗拖拽性能,同时,也较好的避免了电缆护套起鼓的情况出现,增强本发明的整体机械性能。
附图说明
图1为本发明电缆的结构示意图。
图中标号分别表示,1-动力线芯导体,2-接地导体,3-半导电带,4-内屏蔽层,5-动力线芯绝缘层,6-半导电外屏蔽层,7-金属屏蔽层,8-半导电垫芯,9-接地检测导体,10-接地检测线芯绝缘层,11-编织加强层,12-外护套。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
请参阅图1,本发明提供一种技术方案:
本发明所述的一种露天煤矿用高压拖曳橡套软电缆,包括缆芯,所述的缆芯由动力线芯、接地导体及接地检测线芯绞合而成,不加填充,缆芯外挤包外护套12,在缆芯与外护套12之间是编织加强层11。
所述的动力线芯为三根,是由动力线芯导体1,绕包在动力线芯导体1外的半导电带3、依次挤包在半导电带3外的内屏蔽层4、动力线芯绝缘层5、半导电外屏蔽层6、金属屏蔽层7构成。
所述的接地导体2为两根,采用的是镀锡退火软铜导体,镀锡退火软铜导体单丝更细,单丝的直径范围为0.1~0.4mm。
所述的接地检测线芯为一根,是由接地检测导体9以及挤包在接地检测导体外的接地检测线芯绝缘层10构成。
所述的接地检测导体9外径为4.4~8.4mm。
所述的接地检测线芯绝缘层10为特种聚丙烯材料。
所述的接地检测线芯绝缘层10厚度为1.2~1.6mm。
所述特种聚丙烯材料熔融指数为5.0~15.0g/10min,A120法测得维卡软化点为130~150℃,热变形温度为90~110℃0.45MPa,抗张强度为25~30MPa,100%定伸强度为18~23MPa。
所述编织加强层11采用耐高温高强尼龙丝通过高速编织机编织而成,所述耐高温高强尼龙丝单丝直径范围为0.1~0.3mm。
所述外护套12为CPE橡胶,所述CPE橡胶能长期耐温-40~65℃,所述CPE橡胶抗张最小值为18MPa,抗撕强度最小值为8N/mm。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (8)
1.一种露天煤矿用高压拖曳橡套软电缆,其特征在于:包括缆芯,所述缆芯由动力线芯、接地导体及接地检测线芯绞合而成,缆芯外挤包外护套,在缆芯与外护套之间是编织加强层;所述的动力线芯为三根,是由动力线芯导体、绕包在动力线芯导体外的半导电带、依次挤包在半导电带外的内屏蔽层、动力线芯绝缘层、半导电外屏蔽层、金属屏蔽层构成。
2.根据权利要求1所述的一种露天煤矿用高压拖曳橡套软电缆,其特征在于:所述的接地导体为两根,接地导体采用的是镀锡退火软铜导体,镀锡退火软铜导体单丝的直径范围为0.1~0.4mm。
3.根据权利要求1所述的一种露天煤矿用高压拖曳橡套软电缆,其特征在于:所述的接地检测线芯为一根,是由接地检测导体以及挤包在接地检测导体外的接地检测线芯绝缘层构成。
4.根据权利要求3所述的一种露天煤矿用高压拖曳橡套软电缆,其特征在于:所述的接地检测导体外径为4.4~8.4mm。
5.根据权利要求3所述的一种露天煤矿用高压拖曳橡套软电缆,其特征在于:所述的接地检测线芯绝缘层为特种聚丙烯材料,所述的接地检测线芯绝缘层厚度为1.2~1.6mm。
6.根据权利要求5所述的一种露天煤矿用高压拖曳橡套软电缆,其特征在于:所述特种聚丙烯材料熔融指数为5.0~15.0g/10min,A120法测得的维卡软化点为130~150℃,0.45MPa下热变形温度为90~110℃,抗张强度为25~30MPa,100%定伸强度为18~23MPa。
7.根据权利要求1所述的一种露天煤矿用高压拖曳橡套软电缆,其特征在于:所述编织加强层采用耐高温高强尼龙丝通过高速编织机编织而成,所述耐高温高强尼龙丝单丝直径范围为0.1~0.3mm。
8.根据权利要求1所述的一种露天煤矿用高压拖曳橡套软电缆,其特征在于:所述外护套为CPE橡胶,所述CPE橡胶能长期耐温-40~65℃,所述CPE橡胶抗张最小值为18MPa,抗撕强度最小值为8N/mm。
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