液压管接头的种类和选用

Type and selection of hydraulic pipe joint

1

One

焊接式管接头

Welded pipe joint

焊接式直通管接头，主要由接头体 4、螺母2和接管 l组成，在接头体和接管之间用o形密封圈 3密封。当接头体拧入机体时，采用金属垫圈或组合垫圈 5实现端面密封。接管与管路系统中的钢管用焊接连接。焊接式管接头连接牢固、密封可靠，缺点是装配时需焊接，因而必须采用厚壁钢管，且焊接工作量大。

The welded straight through pipe joint is mainly composed of a joint body 4, a nut 2 and a nozzle L, and is sealed by a o sealing ring 3 between the joint body and the nozzle. When the joint body is screwed into the body, the metal gasket or combination washer 5 is used to realize the end face seal. The connecting pipe is welded with the steel pipe in the pipeline system. Welded joints are reliable and reliable. The disadvantage is that they need to be welded during assembly. Therefore, thick walled steel pipes must be used and the welding work is heavy.

2

Two

卡套式管接头

Jacket type pipe joint

卡套式管接头结构。这种管接头主要包括具有 24°锥形孔的接头体4，带有尖锐内刃的卡套2，起压紧作用的压紧螺母3三个元件。旋紧螺母3时，卡套2被推进24°锥孔，并随之变形，使卡套与接头体内 锥面形成球面接触密封；同时，卡套的内刃口嵌入油管l的外壁，在外壁上压出一个环形凹槽，从而起到可靠的密封作用。卡套式管接头具有结构简单、性能良好、 质量轻、体积小、使用方便、不用焊接、钢管轴向尺寸要求不严等优点，且抗振性能好，工作压力可达31.5MPa，是液压系统中较为理想的管路连接件。

The jacket type pipe joint structure. The pipe joint mainly comprises a joint body 4 with a 24 degree cone hole, a clamping sleeve 2 with sharp inner edges, and a pressing nut 3 and three components which compress tightly. When the screw nut is 3, the jacket 2 is pushed forward to the 24 - degree cone hole and then deforms, forming a spherical contact seal with the conical surface of the joint body; at the same time, the inner edge of the jacket is embedded in the outer wall of the tubing L, and the outer wall is pressed out of a circular groove to play a reliable sealing effect. The jacket type pipe joint has the advantages of simple structure, good performance, light quality, small volume, convenient use, no welding, strict axial size requirements, good anti vibration performance and working pressure of up to 31.5MPa. It is an ideal pipe connector in hydraulic system.

3

Three

锥密封焊接式管接头

Conical sealing welded pipe joint

1460162661429801.png

1460162661429801.png

锥密封焊接式管接头结构。这种管接头主要由接头体 2、螺母4和接管5组成，除具有焊接式管接头的优点外，由于它的o形密封圈装在接管5的24°锥体上，使密封有调节的可能，密封更可靠。工作压力为 34.5MPa，工作温度为－25℃～80℃。这种管接头的使用越来越多。

Conical sealing welded pipe joint structure. The joint is mainly composed of joint body 2, nut 4 and nozzle 5. In addition to the advantages of welded pipe joint, its o - shaped sealing ring is installed on the 24 degree cone of the nozzle 5, so that the seal is adjustable and the seal is more reliable. The working pressure is 34.5MPa and the working temperature is from 25 to 80 C. The use of this kind of pipe joint is more and more.

4

Four

扩口式管接头

Expansion joint

扩口式管接头结构。这种管接头有A型和B型两种结构形式：A型由具有74°外锥面的管接头体1、起压紧作用的螺母2和带有60°内锥孔的管套 3组成；B型由具有90°外锥的接头体l和带有90°内锥孔的螺母2组成。将已冲成喇叭口的管子置于接头体的外锥面和管套(或B型螺母)的内锥孔之间，旋 紧螺母使管子的喇叭口受压，挤贴于接头体外锥面和管套(或B型的螺母)内锥孔所产生的间隙中，从而起到密封作用。扩口式管接头结构简单、性能良好、加工和 使用方便，适用于以油、气为介质的中、低压管路系统，其工作压力取决于管材的许用压力，一般为3.5MPa～16MPa。

Extender type pipe joint structure. The joint has two forms of A and B: the A type consists of a pipe joint body with a 74 degree outer cone, a tightening nut 2 and a sleeve 3 with a 60 degree inner cone; the B is composed of a joint body with a 90 degree outer cone and a nut 2 with a 90 degree conical hole. The tube which has been flared into a bell mouth is placed between the outer cone of the joint body and the inner cone hole of the pipe sleeve (or B type nut). The tightening nut makes the tube's bell mouthpiece pressure to be pressed and squeezed in the gap produced by the inner cone hole of the joint external cone and the tube (or B type nut), so as to play a close sealing effect. The extension type pipe joint is simple in structure, good in performance and convenient in processing and use. It is suitable for medium and low pressure pipeline systems with oil and gas as medium. The working pressure depends on the allowable pressure of the pipe, which is generally 3.5MPa to 16MPa.

5

Five

胶管总成

Hose Assembly

钢丝编织和钢丝缠绕胶管总成包括胶管和接头，有A，B，C，D，E，J，…型，其中A、B、C为标准型。A型用于与焊接式管接头连接，B型用于与卡套式管接头连接，C型用于与扩口式管接头连接。图6.5所示是A、B型扣压式胶管总成。扣压式胶管接头主要由接头外套和接头芯组成。接头外套的内壁有环形切槽，接头芯的外壁呈圆柱形，上有径向切槽。当剥去胶管的外胶层，将其套入接头芯时，拧紧接头外套并在专用设备上扣压，以紧密连接。

The steel wire braided and wire wound hose assembly includes hose and joint, with A, B, C, D, E, J,... Type, of which A, B, C are the standard type. The A type is used for connection with welded pipe joints, B is used for connection with the sleeve type pipe joints, and the C type is used for connection with the expansion joint. Figure 6.5 shows the A and B type of buckle hose assembly. The buckle type hose joint is mainly composed of a connecting sleeve and a connecting core. The inner wall of the joint jacket is provided with an annular groove, and the outer wall of the joint core is cylindrical and has radial grooves. When the outer layer of the rubber hose is stripped into the joint core, tighten the outer sleeve and fasten it on the special equipment for tight connection.

6

Six

快速接头

Fast joint

快速接头是一种不需要使用工具就能够实现管路迅速连通或断开的接头。快速接头有两种结构形式：两端开闭式和两端开放式。如图6.6所示为两端开闭式快速接头 的结构图。接头体2、10的内腔各有一个单向阀阀芯4，当两个接头体分离时，单向阀阀芯由弹簧3推动，使阀芯紧压在接头体的锥形孔上，关闭两端通路，使介 质不能流出。当两个接头体连接时，两个单向阀阀芯前端的顶杆相碰，迫使阀芯后退并压缩弹簧，使通路打开。两个接头体之间的连接，是利用接头体2上的6个(或8个)钢球落在接头体10上的V形槽内而实现的。工作时，钢珠由外套6压住而无法退出，外套由弹簧7顶住，保持在右端位置。

Quick connector is a kind of connector which can quickly connect or disconnect the pipeline without using tools. There are two forms of quick connector: open and closed ends and open ends. As shown in Fig. 6.6, the structure diagram of the two ends open and close quick joint is shown. The inner cavity of the joint body 2 and 10 has a one-way valve spool 4 each. When the two joint bodies are separated, the core of the one-way valve is driven by the spring 3, so that the valve core is pressed on the conical hole of the joint body and closes the channels at both ends so that the medium can not be efflux. When the two joint bodies are connected, the top rods of the front ends of the two one-way valve cores collide, forcing the spool to retreat and compress the spring, so that the paths are opened. The connection between the two joint bodies is realized by using 6 (or 8) steel balls on the joint body 2 to fall into the V groove on the joint body 10. When working, the steel ball is pressed by the outer sleeve 6 and can not be withdrawn. The outer cover is held by the spring 7, and is maintained at the right end position.