Poly pipe fusion machine, also known as PE hot melt welding machine, is mainly used to connect PE Water Supply Pipe, PE municipal pipeline, PE Gas Pipe, etc. This welding method is suitable for water supply, gas, sewage treatment, natural gas pipeline construction and other industries. It is a special welding equipment for pipeline production units to carry out construction. It is suitable for hot melt welding of PE pipes and PP pipes. The end faces of the pipes are melted by heating, and then quickly connected to achieve a firm connection of the pipes. This connection method has the advantages of easy operation, high connection strength, and good sealing. It is widely used in various pipe connection occasions that require pressure resistance and corrosion resistance.
Working principle
The working principle of the Poly pipe fusion machine is to achieve the connection of polyethylene pipes through four steps: heating, melting, joining, and cooling.
Heating: The polyethylene pipe is heated by the heating system to reach the melting temperature.
Melting: The heated polyethylene pipe material begins to melt.
Joining: The molten polyethylene pipe material is joined together under the extrusion of the die head system.
Cooling: The joined polyethylene pipe is cooled by the cooling system to solidify the material and complete the connection.
Structure
Poly pipe fusion machine usually consists of a frame, a hydraulic system, a heating system, a die system and a cooling system. The hydraulic system is responsible for clamping the polyethylene pipe, the heating system provides heat to melt the pipe, the die system is responsible for squeezing the molten material together to form a connection, and the cooling system ensures that the material of the connecting part solidifies, thus forming a solid connection.
This connection method is suitable for many industries such as water supply, sewage treatment, pipeline construction and engineering maintenance, and is one of the main methods of polyethylene pipe connection.
Poly pipe fusion machine operating procedures
1. Prepare for welding
The welding standard is mainly to check whether the condition of the welding machine meets the working requirements, such as checking whether the fasteners in various parts of the machine have fallen off or are loose;
Check whether the electrical circuit connection is correct and reliable;
Check whether the hydraulic oil in the hydraulic box is sufficient;
Verify that the power supply matches the tool input requirements:
Whether the heating plate meets the requirements (whether the coating is damaged):
Test run of blunderbuss, oil pump switches, etc.
Then load the slips with the same tube specifications into the frame;
Set the heating plate temperature to the welding temperature (polyethylene baking tube :200-230℃). Before heating, use soft paper or cloth dipped in alcohol to wipe the surface of the heating plate, but be careful not to scratch the PTEE anti-stick layer.
Step 2: Welding
Welding shall be performed in accordance with the parameters of the welding process card. If necessary, it should be adjusted appropriately according to the weather, ambient temperature and other changes.
The main steps are as follows:
(1) Remove dirt from the ends of both tubes with a clean cloth. The tube is placed in the frame slip so that the length of both ends is equal (it should be as short as possible to meet the requirements of matting and heating, usually 25 ~ 30mm). If necessary, the parts outside the pipe frame are lifted with supports so that the pipe axis is at the same height as the center line of the frame, and then secured with slips.
(2) Insert the blunderbuss, first turn on the power switch of the blunderbuss, then slowly close the welded ends of the two pipes, and apply appropriate pressure until there are continuous chips on both ends, remove the pressure, for a few moments, then exit the movable frame, and turn off the power of the blunderbuss. The chip thickness should be 0.5-1.0mm. The chip thickness can be adjusted by adjusting the height of the bladed blade.
(3) Take out the blunderbuss, close the ends of the two tubes, and check the alignment of the two ends. The amount of dislocation at both ends of the pipe should not exceed 10% of the pipe wall thickness or the larger value of 1mm, which can be corrected to a certain extent by adjusting the straightness of the pipe and the elastic slip. There is no obvious gap between the two ends of the pipe when it is closed, and the maximum gap width cannot exceed: 0.3mm(deV225mm), 0.5mm(225mmVde < 400mm), or 1.0mm(de>400mm). If the above requirements are not met, they should be matted again until the above requirements are met.
(4) Measure the drag force (friction resistance of the moving fixture), and this pressure should be superimposed on the process parameter pressure to obtain the actual use pressure. And check whether the heating plate temperature reaches the set value.
(5) After the temperature of the heating plate reaches the set value, put it into the frame and apply the specified pressure until the minimum roll edge on both sides reaches the specified width and the pressure is reduced to the specified value (so that the contact between the tube end face and the heating plate is just maintained) to absorb heat.
(6) After the time is reached, withdraw the active frame, quickly remove the heating plate, and then close the two tube ends, and the switching time should be as short as possible, and cannot exceed the specified value. After cooling to the specified time, the pressure is relieved, the slip is loosened, and the pipe connected is removed.
