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Liquid nitrogen straightly-spraying cold treatment equipment

A cold treatment, direct-injection technology, applied in lighting and heating equipment, refrigerators, refrigeration and liquefaction, etc., can solve the problems of difficult cryogenic treatment, human injury, environmental protection, etc., to save cold source consumption and improve control. Accuracy and the effect of saving cold sources

Inactive Publication Date: 2009-08-19
JIANGSU RUNFU MECHANICAL ROLL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The minimum temperature of traditional medium-type cold treatment equipment is generally not lower than -100°C, and it is difficult to achieve cryogenic treatment in a true sense
[0007] 2. Traditional medium-type cold treatment equipment has problems such as environmental pollution and human injury, which is neither safe nor environmentally friendly

Method used

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  • Liquid nitrogen straightly-spraying cold treatment equipment
  • Liquid nitrogen straightly-spraying cold treatment equipment

Examples

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Embodiment

[0023] Example: such as figure 1 and figure 2 As shown, a liquid nitrogen direct injection type cold treatment equipment includes a processing container 2 and a liquid nitrogen tank 3 communicated through a delivery pipeline 1, a liquid nitrogen nozzle 4 is provided at the end of the delivery pipeline 1 connected to the processing container 2, and the delivery pipe A solenoid valve 6 controlled by a control system 5 is provided on the road 1, a temperature measuring sensor 7 is provided in the processing container 2, and the temperature measuring sensor 7 can carry out signal transmission with the control system 5; The fan 8 controlled by the control system 5 , the blades 9 of the fan 8 are located in the processing container 2 . During the working state, the temperature measuring sensor 7 transmits the temperature in the processing container 2 to the control system 5, and the control system 5 can conveniently realize the adjustment of the roll surface heat transfer coeffici...

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Abstract

The invention discloses liquid-nitrogen direct-injection cold-processing equipment, comprising a processing container and a liquid-nitrogen container which are communicated with each other by a transmission pipeline; one end of the transmission pipeline connected with the processing container is provided with a liquid-nitrogen nozzle; the transmission pipeline is provided with an electromagnetic valve which is controlled by a control system; the processing container is internally provided with a thermometric sensor; when in working state, the thermometric sensor transmits the temperature in the processing container to the control system; the control system can conveniently adjust the heat transfer coefficient of the surface of a roller by controlling the flux of the liquid nitrogen; simultaneously, the object of automatic control is achieved and the control precision is improved.

Description

technical field [0001] The invention relates to a liquid nitrogen direct injection type cold treatment equipment, which is mainly used for cryogenic treatment of rolls. Background technique [0002] The cold rolling roll is the main part of the cold rolling mill. Due to its harsh working conditions, high requirements are placed on its various properties such as the hardness of the roll surface, the uniformity of hardness and the depth of the hardened layer. Cold rolls are usually made of high-carbon chromium (Cr) series alloy tool steel, and meet the necessary performance requirements through strict smelting, forging and heat treatment processes. Quenching of the roll body is the most critical process. [0003] When the roll is quenched, austenite transforms into martensite, and the volume expands, thereby generating pressure. The presence of pressure prevents the transformation of the remaining austenite to martensite. Therefore, there will be a part of austenite that ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B19/04
Inventor 李宇山
Owner JIANGSU RUNFU MECHANICAL ROLL MFG
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