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扣压式海洋软管接头套筒设计

来源:本站 时间:2019-03-22 14:28:10 浏览次数: 103

[导读]: 海洋软管接头在拉伸载荷作用下,有可能发生断裂失效的部位,包括接头芯卡口部位(横截面积为 A1)、套筒根部(横截面积为A2)、接头芯根部(横截面积为A3)。

扣压式海洋软管接头套筒的形状设计,套筒内径尺寸为连接软管外径加上一定间隙。如果间隙太小,连接软管便无法装入;如果太大就需要过大的扣压变形,一般间隙为1.0~1.5mm。在间隙量一定的情况下,套筒的外径尺寸由横截面积A2决定。海洋软管接头在拉伸载荷作用下,有可能发生断裂失效的部位,包括接头芯卡口部位(横截面积为 A1)、套筒根部(横截面积为A2)、接头芯根部(横截面积为A3)。接头和软管装配完成后,在轴向拉伸载荷的作用下,可能发生的失效形式有三种:软管断裂、软管拔脱或套筒从A1、A2、A3中的一处断裂。在设计套筒和接头芯时,为了使A1、A2、 A3三个部位的强度匹配和均衡,需要满足以下关系:A1≈A2+A3 A2≈A3所以,为了提高接头强度,就要求提高软管强度,使软管管体与接头结合紧密,增大A1、A2、A3三个部位的横截面积。

The shape design of the buttoned-down Marine hose coupling sleeve, the inner diameter of the sleeve shall be the outer diameter of the connecting hose with a certain clearance. If the clearance is too small, the connecting hose cannot be loaded; If it is too large, it needs to be buckled and deformed too much. Generally, the clearance is 1.0 ~ 1.5mm. With a certain clearance, the outer diameter of the sleeve is determined by the cross-sectional area A2. Under the action of tensile load, it is possible for the Marine hose joint to break, including the bayonet of the joint core (cross-sectional area A1), the root of the sleeve (cross-sectional area A2), and the root of the joint core (cross-sectional area A3). After the completion of joint and hose assembly, under the action of axial tensile load, there are three possible forms of failure: hose fracture, hose release or sleeve fracture from A1, A2, A3. In the design of sleeve and joint core, in order to make the strength match and balance of the three parts A1, A2 and A3, the following relations need to be satisfied: A1 A2+A3 A3.

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扣压式海洋软管接头套筒外表面直径相等,为光滑的圆柱面。为了增强软管与接头之间的连接强度和密封性能,在套筒的内壁往往设有一定形式的凹槽,按形状可分为三种槽型,有直孔无槽型、锯齿型和环型的组合形。在径向压紧力的作用下,外胶层和铠装层被压缩成波浪形嵌入到套筒的凹槽内,凹槽的厚度根据外胶层的厚度和硬度来决定。对于需要较高强度的海洋软管,扣压时凹槽须采用锯齿型和环型的组合形。这种槽型与锯齿形槽型相比,允许更大的变形和扣压量,具有更好的连接强度和密封性能。

The outer surface of the buttoned-down Marine hose coupling sleeve is equal in diameter and is a smooth cylinder. In order to enhance the connection strength and sealing performance between the hose and the joint, the inner wall of the sleeve is often provided with a certain form of groove, which can be divided into three types according to the shape, including straight hole groove free type, serrated type and ring type combination type. Under the action of radial compression force, the outer rubber layer and armor layer are compressed into a wave shape and embedded into the groove of the sleeve. The thickness of the groove is determined according to the thickness and hardness of the outer rubber layer. For hose with high strength, use a combination of serrated and annular notches. This groove allows greater deformation and compression than the zigzag groove, with better joint strength and sealing performance.

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套筒长度也是一个重要指标,较长的套筒虽然不能增加其本身的强度,因为危险截面的面积A2没有增加,但是可以增加软管与接头之间的结合力,防止软管拔脱。在对套筒进行选材时一般采用10号或20号碳素结构钢。

Sleeve length is also an important indicator. Although a longer sleeve cannot increase its own strength, because the area A2 of the dangerous section does not increase, it can increase the binding force between the hose and the joint to prevent the hose from pulling out. No. 10 or no. 20 carbon structural steel is generally used in the selection of sleeve materials.

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