来源：本站 时间：2019-04-09 14:33:46 浏览次数： 134
卡套式管接头的预装直接影响到密封的可靠性。一般需要专用的预器。管径小的接头可以直接在台钳上进行预装。具体做法是，用一个接头作为母体，将螺母、卡套压紧到管子上。主要有卡套式直通管接头、卡套式端直通接通头、卡套式三通管接头等型式。笔者发现，即使是同一厂家一批货，这几种接头体上锥形孔的深度往往不相同，结果就造成了泄漏，而此问题往往被忽视。管子锯断后应在砂轮等工具上打磨平齐，并且去除毛刺，清洗并用高压空气吹净后再使用。预装时，应尽量保持管子与接头体的同轴度，若管子偏斜过大也会造成密封失效。预装力不宜太大使卡套的内刃刚好嵌入管子外壁，卡套不应有明显变形。在进行管路连接时，再按规定的拧紧力装配。ф6-1卡套的拧紧力为64-1 15n、16фmmr 259n、ф18mm的为450n。如果在预装时卡套变形严重，会失去密封作用。液压过渡接头。
（1）pre-installation of hydraulic transition joints
The preinstallation of bayonet joint directly affects the sealing reliability. Special presets are usually required. Smaller joints can be preassembled directly on the vise. The method is to use a joint as the matrix, the nut, the clamp is pressed to the pipe. The main types are bayonet type through pipe joint, bayonet type end through connector, bayonet type three-way pipe joint and so on. The author found that, even if the same manufacturer a batch of goods, these kinds of joint body conical hole depth is often not the same, resulting in leakage, and this problem is often ignored. After the pipe is cut, it shall be polished and leveled on tools such as grinding wheel, and burrs shall be removed, cleaned and blown clean with high-pressure air before use. When preloading, try to maintain the coaxiality between the pipe and the joint body. If the pipe deflection is too large, it will cause seal failure. The presetting force should not be too strong. The inner edge of the sleeve is just embedded in the outer wall of the pipe, and the sleeve should not be deformed obviously. When connecting pipes, assemble them according to the specified tightening force. The tightening force of 6-1 jacket is 64-1 15n, 16 mmr259n and 18mm 450n. If the clamp is seriously deformed during preassembly, it will lose its sealing function. Hydraulic transition joint.
(2) it is forbidden to add sealant and other fillers. Some people in order to achieve better sealing effect, in the card sleeve coated with sealant, sealant was flushed into the hydraulic system, causing the hydraulic components Yin ni hole blocking fault.
(3) when connecting the pipe, the pipe shall be provided with sufficient deformation allowance to avoid drawing force on the pipe.
(4) when connecting the pipeline, it shall be protected from lateral force, which may lead to loose seal.
The working principle of the bayonet joint is to insert the steel pipe into the bayonet, use the bayonet nut to lock, resist the bayonet, cut into the pipe and seal. It does not need to be welded when it is connected with the steel tube, which is conducive to fire prevention, explosion protection and aerial work, and can eliminate the disadvantages brought by careless welding. Therefore, it is a kind of advanced connecting piece in the pipeline of automatic control devices of oil refining, chemical industry, petroleum, natural gas, food, pharmacy, instrument and instrument, etc. Suitable for oil, gas, water and other medium pipeline connection.