What are the principles, process parameters and operation steps of PE plastic pipe hot melt docking? Let's learn about it with HDPE pipe manufacturers.
1, the principle of
Plastic pipe by cutting, heating, plastic pipe section melting, at a certain time pressure, so that the two plastic pipe sections contact and melt, so as to achieve the purpose of welding. Due to the use of body welding and the formation of double-ring welding in the welding process, the inner and outer walls of the pipe form a reinforcing ring at the same time, the solid ratio of the weld strength is greater than the plastic pipe body.
2. Process parameters
(1) Temperature of the heating plate
Refers to the surface temperature of the heating plate, usually measured with a surface thermometer. When measuring the temperature, the influence of the ambient temperature should be considered. The hot plate temperature should not only ensure the rapid melting of the end face of the pipe, but also ensure that the welded pipe fittings will not be degraded due to elevated temperature.
(2) Welding pressure
The pressurized heating pressure is equivalent to the melting butt pressure. The function is to forcibly heat the pipe, remove the uneven part of the pipe end face, so that the pipe end face is all in contact with the heating plate and heated evenly.
(3) Hem height
The hem height is used to measure the time that the heating pressure acts on the pipe section, that is, the degree of pressure heating.
(4) heat absorption pressure
It is about 1/10 of the melting butt pressure. Its function is mainly to prevent the tube from bouncing back, make the tube close to the heating plate, improve the heating effect and reduce the heating time. The time of the heating phase is related to the cross-sectional area of the welded pipe fitting, the temperature of the heating plate and the ambient temperature.
(5) Fusion docking time
Refers to the time of maintaining the melting butt pressure, mainly related to the wall thickness of the pipe, namely the melting butt area.
(6) Switching cycle
The main process of hot plate fusion butt welding is the heating process and welding process, which are separated from the time by the switch of hot plate.
3. Operation methods and steps
(1) Preparation before starting up
a. The fasteners of the tool and the whole machine are fastened, and the power supply meets the requirements of the machine.
b. Whether the milling cutter, heating plate and clamping tile are consistent with the pipe and whether the machine test is flexible and reliable.
c. Turn on the power supply, open the heating plate and heat it to 200℃ -- 220℃.
(2) Adjust the pipe
a, put the plastic pipe or pipe fitting into the matching clamp tile, put the milling cutter in it, make the pipe or pipe fitting relative to the milling cutter disk distance equal, about 30-40mm.
b. Take out the milling cutter head, tighten the clamp tile, and adjust the coaxial center of the two pipes or fittings.
(3) Docking melting
Into the electric heating plate, to promote two pipes or pipe fittings, stay hot plate on both sides of weld edge is even the dissolution of 2 mm, pressure relief to 0 mpa at this time, and then the tight pressure relief valve, electric heating plate on both sides have fused edge 4 mm, take out the electric heating plate, quickly push the hydraulic cylinder to make two pipe fold under pressure, cooling time according to the pipe wall thickness of the decision, in rain forced cooling water, After Z, remove the clamp screw and take out the butt pipe or fitting.