The main component of PVC is polyvinyl chloride, and other ingredients are added to enhance its heat resistance, toughness and ductility. The uppermost layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the lowermost layer is a back-coated adhesive. It is a well-loved, popular and widely used synthetic material in the world today. Its global use ranks second among various synthetic materials. The essence of PVC is a vacuum blister film, which is used for surface packaging of various types of panels. Therefore, it is also called decorative film and adhesive film, and is used in many industries such as building materials, packaging, medicine and so on. The building materials industry accounts for the largest proportion, at 60%, followed by the packaging industry, as well as several other small-scale applications. First, PVC pipe construction process 1. Processing of pipe: After the length of the pipe is determined, the saw can be cut with a hacksaw or a circular saw blade or a saw blade. The incisions at both ends should be kept flat. Use a butterfly to remove the burrs and chamfer them. The chamfer should not be too large. 2. Bonding of pipe fittings: Before assembly, it is necessary to carry out trial assembly. The outer end of the pipe end of the inserted pipe is about 50mm in length and the inner wall of the pipe fitting interface, and then scrubbed once with cotton yarn coated with acetone, and then on the bonding surface of the pipe. Apply a layer of adhesive evenly with a brush and do not leak. After coating, rotate to the ideal combination angle, insert the pipe into the socket of the pipe fitting, tap it with the raft, and insert the pipe into the socket. Do not disassemble or change the direction within two minutes, and wipe off the joint in time. Adhesive to keep the pipe clean. a. Each section of the riser is equipped with a telescopic section to compensate for the thermal expansion and contraction of the counterflow tube. b. Pay attention to the direction of water when installing the tee, which is easy to form the slope when installing the cross tube. c. If the height of each riser is less than 3m, consider setting one pipe clamp. The cross tube is a single elevator for every 0.6m. d. When the horizontal distance between the horizontal pipe and the drain pipe is greater than that specified in Table 4, an inspection port or a cleaning port shall be provided. Second, PVC pipe production line equipment function 1. Mixing raw materials: PVC stabilizers, plasticizers, antioxidants and other auxiliary materials are added to the high-speed mixer according to the ratio and process. The materials are heated to the set process temperature by mechanical friction and then cooled. The mixer reduces the material to 40-50 degrees; this allows it to be added to the hopper of the extruder. 2. Extruder part: This machine is equipped with a quantitative feeding device to match the extrusion amount with the feeding amount to ensure stable extrusion of the product. Due to the characteristics of the conical screw, the feeding section has a larger diameter, and the heat transfer area and shearing speed of the material are relatively large, which is beneficial to the plasticization of the material, the screw diameter of the metering section is small, the heat transfer area is reduced and the melt is reduced. The shear rate allows the melt to be extruded at lower temperatures. When the screw rotates in the barrel, the PVC mixture is plasticized and pushed to the machine head to achieve compaction, melting and mixing, and to achieve the purpose of exhausting and dehydrating. Feeding device and screw drive device adopt frequency conversion speed regulation, which can realize synchronous speed regulation 3. Extrusion die part: PVC which is compacted, melted and kneaded, and the subsequent material is pushed to the die by the screw. The extrusion die is the construction component of the pipe forming. 4. The vacuum setting water tank is used for shaping and cooling the pipe. The vacuum shaping water tank is equipped with a vacuum system and a water circulation system for setting and cooling, a stainless steel tank, circulating water spray cooling, and a vacuum shaping water tank with front and rear moving devices and left and right, High and low adjustment manual device. 5. The traction machine is used to continuously and automatically pull out the cooled and hardened pipe from the machine head, and frequency control. 6. Cutting machine: After the stroke switch is controlled according to the required length, it will automatically cut, and delay the tumbling, and implement the flow production. The cutting machine will use the fixed length switch signal as the instruction to complete the whole cutting process and run with the pipe during the cutting process. Keeping in sync, the cutting process is completed by electric and pneumatic driving. The cutting machine is equipped with a dust suction device to suck out the debris generated by cutting and recover it. 7. The turning operation of the turning rack is realized by the cylinder through the gas path control. The turning rack is provided with a limiting device. When the cutting saw cuts the pipe, the pipe continues to be conveyed. After the delay, the cylinder enters the work to realize the turning action. , to achieve the purpose of unloading. After unloading, it is automatically reset after a delay of several seconds, waiting for the next cycle. Third, the construction and maintenance of PVC pipe PVC pipes are mainly connected by three types: sealing rubber ring, bonding and flange connection. Pipes with a diameter of 100 mm or more generally use a rubber ring interface; pipes with a pipe diameter of less than 100 mm generally use bonded joints, and some use live joints. When the pipeline crosses the sewer or other pipelines, the metal pipe is generally used, and the plastic pipe and the metal pipe are flanged. The connection between the front and rear of the valve and the pipe is also flanged. 1. When the small-diameter pipe is solvent-bonded, the socket should be rounded to form a groove, and the fracture should be flat and vertical, so that the joint can be firmly bonded to avoid water leakage. 2. PVC pipe with a diameter of 100 mm or more is a rubber ring interface. Before installation, personnel must be arranged to chamfer the pipe socket and check whether the quality of the rubber ring is qualified. The socket, apron, etc. must be wiped clean during installation. 3. Pipe trench excavation installed in traditional pipelines only requires the pipe to be placed in the pipe trench and can be sealed. When the original soil layer is not loosened, the cushion can be pressed without pressing. 4. The general PVC pipe branch can be opened with a tee or a vertical water stop. During the construction, a saddle-shaped fitting can be added with a half-closed tee and clamped with a U-shaped bolt, so that the wall is thickened, and then the hole is directly drilled and then externally threaded plastic parts are taken out. Tests have shown that the pressure test acceptance after construction by this method can fully meet the requirements of the specification. In addition, in the position where the water flow in the pipe generates thrust, such as the elbow, the tee and the pipe end sealing plate, the thrust pier should be provided to withstand the thrust of the water flow. 5. As a new type of non-metallic pipe, PVC pipe can not detect its specific location by using existing metal pipe detection equipment. However, if a pipe is buried in the pipeline, it can be easily solved by laying a wire on the pipe. Allen Socket Screw,Allen Head Cap Screw,Socket Head Cap Screws,Stainless Steel Socket Head Cap Screws Taizhou Fengye Metal Products Co., Ltd. , https://www.fyhandware.com