在每节管的两头有法兰盘,用螺栓将法兰盘连接,两法兰盘之间夹有一层 2 -4mm厚的橡胶板或石棉板。法兰的结构和尺寸按压力的不同而不同，按其压力的大小选取其结构、材料和尺寸。这种连接方法可承受较大的压力，装拆也比较方便，但结构较为复杂。 法兰盘
管子的两头，头为大头， 一头为小头，大头向前，将管子的小头插入管 子的大头中，
四周镶城接头填料。连接时小头的顶端与大头内的支承端面之间应图有3 -8mm的间隙，以便伸缩。同时还应注意，小头插入大头内与大头内壁之间的间隙应均匀, 为保证均匀，可用几根锲子塞在环状空隙中定位，在空隙中嵌塞接头填料。接头填料通常用油麻绳或石棉水泥做成一束一束，每束4~6条,每束的粗细略粗于环状空隙,并均匀一致,如图6-6所示。在缺乏填料时，也可以用桐油石灰代替，待接口填实后，再把接口处浇上混凝土垫层，或每隔一定距离设置支墩来支承管子的重量和固定管路的位置。
在安装前。先把管子接口处外壁及套管内壁凿毛，但在填嵌油麻绳的部位不凿毛，安装时要校正好管路的位置和高度，用泥浆石片做管子的垫层，在浇灌垫层时，接口处也要留一段不浇，便于接头嵌塞填料用。填料般用石棉、 水泥 和油麻绳，油麻绳塞在中间，两头用石棉、水泥填塞，如图6-7所示。石棉、水泥比例般为石棉30% ,水泥70%。封口接好后，要注意保养，一般需14天左右，冬天还要注意防冻。混凝士套管连接一般只用于压力极低或无压情况下的引水管之用，泵的进出水管路上很少用，绝不允许用于泵的进水管。渣浆泵厂家
Before the installation of slurry pump pipeline, the specification, size and quality of pipes and accessories shall be checked. Especially for the high-pressure pipeline, the pressure bearing capacity of the pipe must meet the requirements, and the hydraulic strength test shall be conducted when necessary.
I. selection of pipe diameter
The smaller the diameter of the pipeline, the lower the purchase cost of the pipeline, and the more convenient the installation。 However, the smaller the diameter, the greater the flow rate and the resistance loss, and the uneconomical operation, especially for the water inlet pipeline。 If the diameter is too small, it is easy to cause cavitation of the pump。 Therefore, the selection of pipe diameter should take into account the cost of first purchase, long-term operation cost and operation reliability。 Generally, the flow rate is 2。5-4。5m/s, usually 3m / S is more appropriate, and the flow rate of outlet pipe can be higher。
II. Pipeline connection method
1. Flange connection
There are flange plates at both ends of each section of pipe, which are connected by bolts。 A layer of 2-4mm thick rubber plate or asbestos plate is sandwiched between the two flange plates。 The structure and size of flange are different according to the pressure, and the structure, material and size are selected according to the pressure。 This connection method can bear large pressure and is convenient to assemble and disassemble, but its structure is complex。 Flange plate
When connecting, the inner mouth of the pipe and the inner mouth of the pad shall be aligned without dislocation. The inner opening of the pad shall not be smaller than the pipe diameter. In order to avoid affecting the flow of liquid, the outer diameter of the two flanges is often made into the same size, which can be aligned with the outer circle. During installation, the two flange surfaces shall be cleaned. When tightening the bolts, they shall be weighed and tightened. The tightening force of each bolt shall be even to prevent water leakage or air leakage caused by flange surface deflection.
2. Threaded connection
There is a section of thread at both ends of each section of pipe, and then it is connected with a threaded hoop。 When connecting, wrap a bit of hemp around the thread, apply lead oil, or wrap Teflon thin strip。 Pay attention that the direction of winding hemp or Teflon thin strip should be the same as the thread direction, otherwise the hemp or Teflon strip will not eat in。 First, confirm the buckle by hand, and then tighten it with pipe tongs or chain tongs。 Threaded connection is generally used for the case of small diameter and low pressure。 It is commonly used for the pipeline connection with diameter less than 150 mm。
3。 Socket pipe connection
The two ends of the pipe are big end and one end is small end. The big end is forward. Insert the small end of the pipe into the big end of the pipe,
Surrounding inlaid city joint filler. When connecting, there should be a clearance of 3-8mm between the top of the small head and the supporting end face in the large head to facilitate expansion. At the same time, it should be noted that the gap between the small head inserted into the big head and the inner wall of the big head should be uniform. To ensure uniformity, several wedge plugs can be used to locate in the annular gap, and joint filler can be inserted in the gap. The joint filler is usually made of a bundle of hemp rope or asbestos cement, with 4-6 pieces in each bundle. The thickness of each bundle is slightly larger than the annular space, and it is uniform, as shown in Figure 6-6. In case of lack of filler, it can also be replaced by tung oil lime. After the interface is filled, the concrete cushion shall be poured on the interface, or piers shall be set every certain distance to support the weight of the pipe and fix the position of the pipeline.
4. Concrete pipe sleeve joint connection
Before installation. First roughen the outer wall of the pipe joint and the inner wall of the casing, but do not roughen the part filled with oil hemp rope. During installation, correct the position and height of the pipe. Use mud stone as the cushion of the pipe. When pouring the cushion, leave a section of the joint not to be poured for the convenience of joint plugging. Generally, asbestos, cement and hemp rope are used as fillers. The hemp rope is plugged in the middle and the two ends are filled with asbestos and cement, as shown in Figure 6-7. The proportion of asbestos and cement is generally 30% and 70% respectively. After sealing, pay attention to maintenance, generally about 14 days, and pay attention to antifreeze in winter. Generally, the connection of coagulant casing is only used for the water diversion pipe under the condition of extremely low pressure or no pressure, and the inlet and outlet water pipes of the pump are rarely used, so it is not allowed to be used for the water inlet pipe of the pump. Slurry pump manufacturer