The steel pipe to be quenched and tempered is lifted by the crane to the loading gantry, and the loading platform surface is formed with the horizontal plane (tilt). The inclined angle of 3o facilitates the natural rolling of the steel pipe from top to bottom; at the bottom of the loading rack The end is provided with a retaining mechanism (restricting the steel pipe after rolling sorting). In addition, a pneumatic turning mechanism is also provided at the bottom end of the loading gantry. Under the command of the control signal of the control system, the pneumatic turning mechanism turns the materials one by one to the double idle roller conveying roller according to a certain cycle, and the double roller conveying roller path forms a certain angle with the transmission line; In this way, when the steel pipe is moved forward along the transmission line, the movement of the front side is rotated, so that the uniformity of the heating of the steel pipe can be ensured. After steel 750KW warmed (Curie point before heating), 1000KW a raised temperature (Curie point after heating) to a temperature normalizing, quenching required. The steel pipe moves forward through three-stage spray cooling quenching (the first two stages are spray water mist cooling, and the latter stage is spray water cooling). When the large pipe is heated, the four-stage cooling is turned on. If the small pipe is heated, the water-cooling ring is only opened for two stages. The fourth-stage air-cooled part not only cools and quenches the steel pipe, but also blows the moisture remaining on the outer surface of the pipe after water quenching, thereby effectively preventing the water remaining on the outer surface of the pipe from tempering and heating the steel pipe. influences. After the tempering heating is completed, the heated material is turned over the double idler transfer roller path through a pneumatic turning mechanism to enter the cooling bed (same as the loading platform, the cold bed frame surface is also at an angle of 5o from the horizontal plane ). The end is connected to a rack ( 7 pieces can be placed ).

Detailed working process of steel pipe quenching and tempering production line

A, the steel pipe is in place, and the material is detected (alarm when there is no material). Under the control of PLC , the two-position five-way valve of the control cylinder is energized, and the piston rod of the cylinder is contracted into position. The steel pipe was lifted by the flap mechanism and then rolled to the end of the flap. As the cylinder piston rod is extended into position (stroke 370mm ), the steel pipe will fall smoothly in the center of the conveyor roller. The steel tube will be rotated and advanced according to the movement path set by the roller table.

B, in the rotation and advancement of the steel pipe, in order to ensure the normal operation of the equipment and timely discovery of the steel pipe clamp, in the middle of the steel pipe feed roller (see the general figure No. 27 ), there is a detection card tube switch (pulse type), such as once the card The tube will signal.

C. When the tail end of the steel pipe is about to leave the quenching first section sensor, there is an on-beam feeding detection photoelectric switch. If no material is detected, the feeding flap mechanism is re-loaded once.

1 ) In the second section of the quenching sensor, an infrared thermometer (American Leitai) is used to detect the heating temperature induced by the quenching at any time to provide reliable data for the normalizing sensor and realize closed-loop temperature control. In order to ensure accurate temperature measurement, a mechanical scale scraper mechanism is provided here (Note: not shown in the figure).                                 

2 ) Similarly, the infrared sensor (American Leitai) is also installed at the end of the normalizing sensor. This thermometer is the final confirmation of the actual temperature of the steel pipe before quenching.                                 

3 ) The heating steel pipe continues to rotate and advance. When it enters the spraying device, there is a photoelectric detection switch for the radiation detection. Once the material is detected, the first group of sprays opens, and the second group of sprays opens. After that, the spray dryer is turned on.                                 

4 ) In order to ensure the actual temperature after the steel pipe is sprayed dry, an infrared thermometer (American Leitai) is installed at the end of the spray drying device to provide reliable data for the tempering sensor and realize closed-loop temperature control.                                 

5 ) At the end of the second section of the tempering sensor, an infrared thermometer (American Leitai) is also provided to finally detect the actual temperature of the steel tube after induction heating by tempering.                                 

6 ) When the steel pipe reaches the end of the roller table, there is a discharge blocking mechanism, and a photoelectric switch is also provided. When the photoelectric switch detects the material, the piston rod of the discharge flap mechanism contracts. The steel pipe is lifted up and rolled onto the cold bed discharge gantry, which is conveyed by the sprocket chain scraper to the end of the cold bed at a constant speed, and reaches the collecting gantry for about 5 minutes. It is calculated that the temperature of the lower cooling bed is much lower than the specified limit of not more than 150 °C .                                 

7 ) Continue to repeat the next work cycle.                                 

The above work process is carried out automatically by the operator on the computer, according to the required heating of the steel pipe, input specifications and other relevant parameters.