System for cooling seamless steel pipe mandrel and cooling method based on the system

Abstract

The invention discloses a system for cooling a seamless steel pipe mandrel, which comprises: a water collection main pipe; several cooling spray boxes, and several water delivery pipes correspondingly connected to the water collection main pipe; There are valves and flowmeters on each valve; the control device is connected to each valve and flowmeter respectively, receives the flow data transmitted by the flowmeter, and adjusts the opening of the valve. The invention also discloses a cooling method based on the above-mentioned system, which includes the steps of: calibrating the system before use; measuring and obtaining the temperature distribution curve in the length direction of the seamless steel pipe mandrel by using a thermometer, and the control device is based on The temperature distribution curve and the target temperature value set the flow density of each cooling spray box; the control device adjusts the opening of each valve according to the flow density of each cooling spray box and the data measured in real time by each flowmeter, so as to control the flow rate of each cooling spray box respectively. The water spray volume and water spray time of the spray box are controlled in a closed loop.

Description

technical field [0001] The invention relates to a cooling system and a cooling method based on the system, in particular to a mandrel cooling system and a cooling method based on the system. Background technique [0002] In the working process of the continuous pipe rolling mill, especially the three-roll adjustable mandrel continuous pipe rolling mill, the working process of the mandrel is generally: threading the rod → rolling the pipe → stripping the rod → cooling the mandrel → entering the next working process. Mandrel cooling is an important auxiliary process of rolling tubes. If the cooling temperature of the mandrel is uneven, or the cooling temperature does not meet the requirements, it will affect the dryness of the graphite lubricating layer, affect the life of the mandrel and the quality of the inner and outer surfaces of the waste tube. What's more, an overcooled or overheated mandrel will cause jamming or rod wrap failure during rolling. Generally speaking, th...

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Problems solved by technology

[0004] The patent number is CN103567225A, and the publication date is February 12, 2014. The Chinese patent document titled "A Mandrel Cooling Equipment" discloses a steel pipe mandrel cooling equipment, which uses multiple sets of rollers and spray rings. While the rod rotates on the supporting roller, the spray ring is sprayed and cooled, but because the length direction cannot be controlled in sections, it has no effect on solving the temperature unevenness in the length direction

[0005] The patent number is CN201720247U, and the publication date is January 26, 2011. The Chinese patent document titled "mandrel cooling device for seamless steel pipe production line" discloses a mandrel cooling device for seamless steel pipe production line. The feeding device and the blanking device put the hot mandrel into the cooling water tank for cooling. The work efficiency is high and the equipment is simple. However, the cooling uniformity of the water tank is poor, and the air film formed on the surface of the cooling water and the hot mandrel affects the heat transfer efficiency.

[0006] In summary, from the actual situation of the steel plant and the existing technology, the two main cooling methods for steel pipe mandrels (water tank type immersion cooling and spray cooling) have complex device structures and difficult temperature gradients in the length direction. Improvement, poor cooling uniformity, and large water consumption

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