Vertical tube expander has the characteristics of simple operation and convenient movement, and automatic control can ensure the quality of expansion joint, so it has been widely used in various chemical, boiler, metallurgy, petroleum, refrigeration and other manufacturing sectors. The vertical tube expander is usually composed of the controller, the body of Zhang mansion and the pipe reel.
The tube reel is composed of an expanding rod, a ball and a shell. Its function is to roll and press the steel pipe, which causes the steel pipe to produce radial plastic deformation and to be tightly connected with the tube sheet. The pipe reel is connected with the main shaft of the tube expander through universal joint and connecting rod (also known as telescopic rod). The tube expander is the prime mover of the pipe reel, which is composed of shell, motor, reducer, spindle, handle, power cord, plug, etc. The shell is made of aluminum alloy. The motor is three-phase 50 Hz two pole squirrel cage asynchronous motor with self fan cooling. The rotation of the motor is transmitted to the spindle through the reduction gear. The handles are located on both sides of the fuselage. The power line adopts four core sheathed flexible wire, of which the black core wire is the grounding wire; the place where the power line enters the shell is covered with a rubber sheath. The power plug adopts three-phase four post plug, through which the power line is connected with the controller. The function of the controller is to automatically control the expansion tightness to ensure the expansion quality, and is equipped with leakage protection device to prevent human body from electric shock. The instrument adopts semiconductor components and switch circuit, small volume, light weight, high sensitivity, reliable action and convenient adjustment. The control principle is as follows: when the tube expander drives the pipe roller to rotate the steel pipe, the motor will output a certain torque. When the steel pipe is expanded and tightly connected with the tube sheet, the output torque of the motor will increase rapidly, and the input current of the motor will also increase in a certain proportion. Therefore, the tightness can be controlled by controlling the input current of the motor; when the input current of the machine exceeds When the specified value is set, the opening and closing of the circuit will make the tube expander stop running, reverse and retreat the steel pipe, and stop running after withdrawing.
The basic functions of the tube expander are completed by the precise coordination of each part of the vertical tube expander.
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