초록 ▼

A process is set forth for cold rolling of a metal strip, wherein the metal strip passes through a nip between two counter-rotating rolls, driven in counter-rotation substantially at room temperature, wherein a cold and/or liquefied gas, preferably an inert gas, is blown into the area of the nip or

A process is set forth for cold rolling of a metal strip, wherein the metal strip passes through a nip between two counter-rotating rolls, driven in counter-rotation substantially at room temperature, wherein a cold and/or liquefied gas, preferably an inert gas, is blown into the area of the nip or roll gap. A roll stand according to the present invention comprises two counter-rotating rolls forming a nip or rolling gap and nozzle means for blowing a cold and/or liquefied gas, preferably an inert gas, through at least one orifice of said nozzle means into the area of the roll nip. Preferably, the temperature of the cold and/or liquefied gas is appreciably lower than room temperature.

대표청구항 ▼

A process is set forth for cold rolling of a metal strip, wherein the metal strip passes through a nip between two counter-rotating rolls, driven in counter-rotation substantially at room temperature, wherein a cold and/or liquefied gas, preferably an inert gas, is blown into the area of the nip or

A process is set forth for cold rolling of a metal strip, wherein the metal strip passes through a nip between two counter-rotating rolls, driven in counter-rotation substantially at room temperature, wherein a cold and/or liquefied gas, preferably an inert gas, is blown into the area of the nip or roll gap. A roll stand according to the present invention comprises two counter-rotating rolls forming a nip or rolling gap and nozzle means for blowing a cold and/or liquefied gas, preferably an inert gas, through at least one orifice of said nozzle means into the area of the roll nip. Preferably, the temperature of the cold and/or liquefied gas is appreciably lower than room temperature. suction port of the ejector pump. 3. The refrigerant cycle system according to claim 1, wherein the compressor and the ejector pump are disposed in series, relative to a refrigerant flow from the evaporator to the radiator. 4. The refrigerant cycle system according to claim 3, further comprising a switching valve for opening and closing a bypass passage through which refrigerant from the evaporator flows toward the radiator while bypassing the compressor. 5. The refrigerant cycle system according to claim 1, wherein the compressor and the ejector pump are disposed in parallel, relative to a refrigerant flow from the evaporator to the radiator. 6. The refrigerant cycle system according to claim 5, further comprising a switching valve for opening and closing a bypass passage through which refrigerant from the evaporator flows toward the radiator while bypassing the compressor. 7. The refrigerant cycle system according to claim 1, further comprising a gas-liquid separator for separating refrigerant from the radiator into gas refrigerant and liquid refrigerant; and a refrigerant pump for circulating refrigerant from the gas-liquid separator toward the nozzle of the ejector after passing through the heating unit. 8. The refrigerant cycle system according to claim 7, wherein the refrigerant pump is disposed to suck mainly liquid refrigerant from the gas-liquid separator. 9. The refrigerant cycle system according to claim 7, wherein the refrigerant pump is disposed to suck mainly gas refrigerant from the gas-liquid separator. 10. The refrigerant cycle system according to claim 1, wherein the refrigerant flowing from the heating unit to the nozzle of the ejector pump has a pressure equal to or higher than the critical pressure of the refrigerant. 11. The refrigerant cycle system according to claim 1, wherein one of carbon dioxide, fluorocarbon, hydrocarbon and a mixture refrigerant is used as the refrigerant. 12. The refrigerant cycle system according to claim 1, wherein the evaporator is disposed to cool air to be blown into a compartment, for cooling the compartment. 13. The refrigerant cycle system according to claim 1, wherein the evaporator is disposed to cool a heat-generating member that generates heat when being operated. 14. The refrigerant cycle system according to claim 13, wherein the heat-generating member is a battery mounted on a vehicle. 15. The refrigerant cycle system according to claim 1, wherein the heating unit is disposed to heat the refrigerant using hot water from a vehicle engine as a heating source. claim 3, wherein the moving step comprises moving the structure and nozzle assembly around the circumference of the tank. 5. The method of claim 4, wherein the moving step further comprises moving the platform and nozzle assembly along the vertical axis. 6. The method of claim 3, wherein the moving step further comprises moving the platform and nozzle assembly along the vertical axis. 7. The method of claim 3, wherein the moving step comprises moving the nozzle assembly in a spiral pattern around the tank so that strips of removed material slightly overlap for substantial portions of the length of the strips. 8. The method of claim 3, wherein the moving step comprises moving the nozzle assembly in a spiral pattern around the tank so that the strips of removed material do not overlap for substantial portions of the length. 9. The method of claim 1, further comprising viewing the strip through a camera to obtain information for use in obtaining the predetermined texture of the surface. 10. The method of claim 1, wherein the water flows through the nozzles at a pressure, and the pressure is varied to compensate for wear of the nozzles and maintain the predetermined texture of the surface. 11. The method of claim 1, further comprising determining the rate of travel of the nozzle and regulating the flow of water through the nozzle so that water does not impact the surface with sufficient pressure to texturize the surface below a specified rate of travel. 12. A concrete storage tank having a surface, over 95% of which is roughened by the method of claim 1. 13. The method of claim 1, wherein the spray nozzle and distance of the nozzle to the surface of the tank and water pressure to the nozzle and movement of the gantry are selected to produce an ICRI roughness of 5-6 over 90% of the surface sprayed. 14. The method of claim 1, further comprising controlling the pressure to the nozzle to provide at least two gallons per minute of water at over 20,000 pounds per square inch to the nozzle. 15. The method of claim 1, further comprising supporting a camera off the gantry and located and orientated to provide an image of the wall at the location where, and shortly after, the strip of material is removed by the nozzle. 16. The method of claim 1, further comprising locating a shield intermediate the nozzle and the platform, the shield being configured to block a majority of the debris ejected from the walls from hitting the platform during removal of material from the exterior surface of the tank. 17. The method of claim 1, further comprising connecting a roller to a frame to which the nozzle is connected and placing the roller in contact with the wall adjacent the nozzle to maintain the predetermined distance between the nozzle and the wall, and mounting the nozzle to allow movement relative to the platform along an axis generally perpendicular to the wall. 18. A method of making a concrete storage tank, comprising: forming a cylindrical tank having a vertical wall made of concrete, the tank having a base extending radially outward from the walls; tethering a gantry from a center pin extending from a portion of the storage tank, the gantry configured to move around a circumference of the tank on the base as constrained by the tether, the gantry having a platform that can be moved upwards and downwards relative to the gantry and having a spray nozzle assembly mounted to the platform so the nozzle assembly can move around, and up and down an exterior surface of the tank; moving the nozzle assembly over the exterior surface of the tank at a predetermined distance from the surface while spraying high pressure water through the nozzle assembly to provide a predetermined texture to the exterior surface of the concrete over at least 90% of the surface; spraying a coating material on the texturized surface; placing one of cables, wires and bars over the texturized surface covered by the coating material and placing the one of the cables, wir