Rolling mill equipment for differential temperature rolling

Abstract

The utility model relates to the technical field of rolling mills, and discloses rolling mill equipment for differential temperature rolling, which comprises a base, and a heating device is fixedly mounted on one side of the input end of a roller way. According to the rolling mill equipment for differential temperature rolling, the extending end of the hydraulic lifting structure ascends and descends to drive the cooling cavity to ascend and descend in the connecting support, the cooling cavity can be close to the surface of rolled hot metal, a certain gap is kept between the cooling cavity and the surface of the hot metal, meanwhile, the cooling cavity is filled with liquid nitrogen, and then the hot metal is cooled; the temperature of the liquid nitrogen is low, heat absorption can be effectively conducted on the hot metal, the hot metal is cooled, cooling liquid does not need to be sprayed to the surface of the hot metal, the hot metal can be cooled, the liquid nitrogen is loaded in the cooling cavity, the cooling cavity is controlled to be close to the position of the surface of the hot metal, and the hot metal is cooled through heat absorption of the liquid nitrogen; the situation that cooling liquid is directly sprayed to the surface of hot metal, the hot metal and the cooling liquid are subjected to chemical reaction, and the metal quality is reduced is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling mills, in particular to a rolling mill equipment for differential temperature rolling. Background Art

[0002] A rolling mill is a piece of equipment used for metal processing. It can roll metal materials into plates, tubes, bars, etc. of various shapes and sizes. Rolling mill equipment is usually composed of multiple rollers. Pressure is applied between the rollers to plastically deform the metal material to achieve rolling processing.

[0003] Differential temperature rolling mill equipment is commonly used in hot rolling process and is suitable for producing high-strength, high-hardness, high-toughness and high-quality metal materials. The basic principle of this equipment is to control the hot and cold rolls at different temperatures between the working rolls and the support rolls of the rolling mill. By adjusting the temperature difference between the hot and cold rolls, the metal material undergoes plastic deformation at different temperatures, thereby changing the lattice structure and properties of the metal.

[0004] At present, differential temperature rolling mill equipment usually relies on a spray system to spray cooling medium (usually water or coolant) to cool the rolls. The cooling spray system can perform fixed-point cooling in the area where the rolls contact the metal material, thereby quickly reducing the temperature of the rolls. Although this method can cool the metal material, the cooling liquid sprayed on the hot metal may indeed have a certain impact on the quality of the metal. For example, some coolants may react chemically with the metal, causing corrosion, oxidation or other changes, thereby affecting the chemical composition and properties of the metal and reducing the quality of the metal material. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a rolling mill equipment for differential temperature rolling, which has the function of lifting and lowering the cooling cavity in the connecting bracket by the extension end of the hydraulic lifting structure, so that the cooling cavity can be close to the hot metal surface after rolling, and a certain gap can be maintained between the cooling cavity and the hot metal surface. At the same time, the cooling cavity is filled with liquid nitrogen to cool the hot metal, and the temperature of the liquid nitrogen is low, which can effectively absorb heat from the hot metal and realize cooling of the hot metal. The hot metal can be cooled without spraying cooling liquid on the hot metal surface. Liquid nitrogen is loaded in the cooling cavity, and the cooling cavity is controlled to be close to the hot metal surface. The hot metal is cooled by absorbing heat using liquid nitrogen, and cooling liquid is avoided from being sprayed directly on the hot metal surface, which causes a chemical reaction between the hot metal and the cooling liquid, resulting in reduced metal quality, etc., thereby solving the above-mentioned technical problems.

[0007] Technical Solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rolling mill equipment for differential temperature rolling, comprising a base, a roller table fixedly installed on the top surface of the base, and two rolling mills fixedly installed at the input end and output end of the roller table, wherein a heating device is fixedly installed on one side of the input end of the roller table, a cooling device is fixedly installed on the roller table between the two rolling mills, a liquid nitrogen delivery pipe is fixedly installed on one side of the top surface of the cooling device, and the other end of the liquid nitrogen delivery pipe is detachably connected to the joint of the storage tank.

[0009] As the preferred technical solution of the utility model, the heating device is composed of a connecting plate, a heating tube and a controller. The connecting plate is fixedly installed on the bottom ends of both sides of the roller, and the heating tube is fixedly installed on the top surface of the connecting plate. The control end of the heating tube is electrically connected to the signal output end of the controller, and a plurality of heating tubes are provided. The heating end of the heating tube is located directly above the roller, and the heating tube is located at the input end of the roller.

[0010] As the preferred technical solution of the utility model, the cooling device is composed of a connecting bracket, a hydraulic lifting structure and a cooling cavity. The connecting bracket is fixedly installed at the middle end of the roller table, and the connecting bracket is located between two rolling mills. The middle end of the connecting bracket is fixedly installed with a hydraulic lifting structure, and the extending end of the hydraulic lifting structure is fixedly connected to the middle end of the top surface of the cooling cavity.

[0011] As an optimal technical solution of the utility model, the cooling cavity is a sealed and high-temperature resistant metal cavity, the cooling cavity is filled with liquid nitrogen, a connecting port is opened on one side of the middle end of the top surface of the cooling cavity, the inner wall of the connecting port is fixedly connected to one end of the liquid nitrogen delivery pipe, and the storage tank is placed on one side of the base.

[0012] As a preferred technical solution of the utility model, a low-temperature resistant solenoid valve is fixedly installed in the connecting port, and a second low-temperature resistant solenoid valve is installed in the joint of the storage tank, and the first low-temperature resistant solenoid valve is the same model as the second low-temperature resistant solenoid valve.

[0013] As a preferred technical solution of the utility model, the top surface of the storage tank is also provided with a connector connected to the pressurizing device.

[0014] Compared with the prior art, the utility model provides a rolling mill equipment for differential temperature rolling, which has the following beneficial effects:

[0015] 1. The utility model drives the cooling cavity to rise and fall in the connecting bracket by lifting the extended end of the hydraulic lifting structure, so that the cooling cavity can be close to the hot metal surface after rolling, and keep a certain gap with the hot metal surface. At the same time, the cooling cavity is filled with liquid nitrogen to cool the hot metal. The temperature of the liquid nitrogen is low, which can effectively absorb heat from the hot metal and realize cooling of the hot metal. The hot metal can be cooled without spraying cooling liquid on the hot metal surface. The cooling cavity is loaded with liquid nitrogen, and the cooling cavity is controlled to be close to the hot metal surface. The hot metal is cooled by absorbing heat from liquid nitrogen, and it is avoided to spray cooling liquid directly on the hot metal surface, which causes a chemical reaction between the hot metal and the cooling liquid, resulting in reduced metal quality.

[0016] 2. The utility model provides a connector on the top surface of the storage tank so that it can be connected to a pressurizing device. When the storage tank is connected to the pressurizing device, the pressurizing device can be used to pressurize the nitrogen in the storage tank to form liquid nitrogen, thereby allowing the nitrogen to be reused and reducing the cost of using liquid nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a side cross-sectional schematic diagram of the structure of the utility model;

[0019] Figure 3 It is a three-dimensional cross-sectional schematic diagram of the structural cooling device of the utility model;

[0020] Figure 4 The utility model structure Figure 3 A is a partial enlarged schematic diagram.

[0021] Among them: 1. Roller; 2. Rolling mill; 3. Heating device; 4. Cooling device; 5. Liquid nitrogen delivery pipe; 6. Storage tank; 301. Connecting plate; 302. Heating pipe; 401. Connecting bracket; 402. Hydraulic lifting structure; 403. Cooling cavity. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0023] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See also Figure 1-4 A differential temperature rolling mill equipment comprises a base, a roller table 1 for conveying hot metal materials is installed on the top surface of the base, two rolling mills 2 for rolling metal materials are fixedly installed at the output end and input end of the roller table 1, and a heating device 3 is fixedly installed on one side of the roller table 1 at its input end, and the heating device 3 is located at the front end of the input end of the rolling mill 2, wherein;

[0026] The heating device 3 is composed of a connecting plate 301, a heating tube 302 and a controller. The connecting plate 301 is fixedly installed at the bottom ends of both sides of the roller 1. The heating tube 302 is fixedly installed on the top surface of the connecting plate 301, and the control end of the heating tube 302 is electrically connected to the signal output end of the controller. The heating tube 302 is controlled by the controller to start heating. The temperature of the heating tube 302 is set to be consistent with the surface temperature of the hot metal material to avoid the surface temperature of the hot metal from decreasing before rolling, thereby keeping the hot metal warm.

[0027] A cooling device 4 is fixedly installed on the outer wall of the roller table 1 between the two rolling mills 2. The cooling device 4 is filled with liquid nitrogen to cool the hot metal material after rolling. A liquid nitrogen delivery pipe 5 is also fixedly installed on the top surface of the cooling device 4. The other end of the liquid nitrogen delivery pipe 5 is detachably connected to the joint of the storage tank 6. When the liquid nitrogen is reduced to nitrogen gas by heat, it is delivered to the storage tank 6 through the liquid nitrogen delivery pipe 5 for storage.

[0028] The cooling device 4 is composed of a connecting bracket 401, a hydraulic lifting structure 402 and a cooling cavity 403. The connecting bracket 401 is fixedly installed at the middle end of the roller table 1 and is located between the two rolling mills 2. A hydraulic lifting structure 402 is fixedly installed at the middle end of the connecting bracket 401. The extended end of the hydraulic lifting structure 402 is fixedly connected to the middle end of the top surface of the cooling cavity 403. The cooling cavity 403 is lifted and lowered in the connecting bracket 401 by the lifting of the extended end of the hydraulic lifting structure 402, so that the cooling cavity 403 can be close to the hot metal surface after rolling and keep close to the hot metal surface. A certain gap is maintained, and at the same time, the cooling cavity 403 is filled with liquid nitrogen to cool the hot metal. The temperature of the liquid nitrogen is low, and it can effectively absorb heat from the hot metal, thereby achieving cooling of the hot metal. The hot metal can be cooled without spraying cooling liquid on the surface of the hot metal. The cooling cavity 403 is loaded with liquid nitrogen, and the cooling cavity 403 is controlled to be close to the surface of the hot metal. The hot metal is cooled by absorbing heat from liquid nitrogen, and it is avoided to spray cooling liquid directly on the surface of the hot metal, which causes a chemical reaction between the hot metal and the cooling liquid, thereby reducing the quality of the metal.

[0029] The cooling cavity 403 is a sealed, high-temperature resistant metal cavity, and a connecting port is provided on one side of the middle end of the top surface of the cooling cavity 403, and the inner diameter of the connecting port is fixedly connected to the outer wall of one end of the liquid nitrogen delivery pipe 5, and the storage tank 6 connected to the other end of the liquid nitrogen delivery pipe 5 is placed on one side of the base. A connector that can be connected to a pressurizing device is also provided on the top surface of the storage tank 6, and a low-temperature resistant solenoid valve is fixedly installed in the connecting port of the cooling cavity, and another low-temperature resistant solenoid valve is also installed in the joint of the storage tank 6. The two low-temperature resistant solenoid valves are of the same model. When the cooling cavity 403 is loaded with liquid nitrogen to cool the hot metal, the liquid nitrogen is reduced to gas by heat, and the nitrogen is sent to the storage tank 6 through the liquid nitrogen delivery pipe 5 for storage. The opening and closing of the liquid nitrogen delivery pipe 5 is controlled by the opening and closing of the low-temperature resistant solenoid valve, and the nitrogen or liquid nitrogen is input or output. A connector is set on the top surface of the storage tank 6 so that it can be connected to the pressurizing device. After the storage tank 6 is connected to the pressurizing device, the pressurizing device can be used to pressurize the nitrogen in the storage tank 6 to form liquid nitrogen, so that the nitrogen can be reused and the cost of using liquid nitrogen can be reduced.

[0030] The pressurizing device, low temperature resistant solenoid valve, roller table 1 and rolling mill 2 mentioned above are all existing mature technologies and will not be described in detail in this article.

[0031] When in use, the heated hot metal is transferred to the roller 1 through the conveying equipment, and the roller 1 is operated to send the hot metal into the rolling mill 2, and the hot metal is rolled by the rolling mill 2. Before the roller 1 transports the hot metal, the heating is started by the heating device 3 to make the temperature around the input end of the roller 1 consistent with the surface temperature of the hot metal to avoid the temperature of the hot metal from decreasing before rolling. According to the thickness of the hot metal, the height of the hydraulic lifting structure 402 is adjusted to make the bottom surface of the cooling cavity 403 close to the surface of the hot metal and maintain a certain gap. The rolled hot metal is output from the rolling mill 2 and cooled by the liquid nitrogen in the cooling cavity 403. The cooled hot metal is input into another rolling mill 2 for rolling. The liquid nitrogen is reduced to gas after being heated. At this time, the low-temperature resistant solenoid valve is started to send the gas into the storage tank 6 for storage. The storage tank 6 is connected to the pressurizing device. The pressurizing device pressurizes the nitrogen in the storage tank 6 and reduces it to liquid nitrogen, so that the liquid nitrogen can be used again.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rolling mill equipment for differential temperature rolling, comprising a base, a roller table (1) fixedly mounted on the top surface of the base, and two rolling mills (2) fixedly mounted at the input end and the output end of the roller table (1), characterized in that: A heating device (3) is fixedly installed on one side of the roller table (1) located at the input end, a cooling device (4) is fixedly installed on the roller table (1) located between the two rolling mills (2), a liquid nitrogen delivery pipe (5) is fixedly installed on one side of the top surface of the cooling device (4), and the other end of the liquid nitrogen delivery pipe (5) is detachably connected to a joint of a storage tank (6).

2. A rolling mill equipment for differential temperature rolling according to claim 1, characterized in that: The heating device (3) is composed of a connecting plate (301), a heating tube (302) and a controller; the connecting plate (301) is fixedly mounted on the bottom ends of both sides of the roller conveyor (1); a heating tube (302) is fixedly mounted on the top surface of the connecting plate (301); a control end of the heating tube (302) is electrically connected to a signal output end of the controller; a plurality of heating tubes (302) are provided; a heating end of the heating tube (302) is located directly above the roller conveyor (1); and the heating tube (302) is located at the input end of the roller conveyor (1).

3. The rolling mill equipment for differential temperature rolling according to claim 1, characterized in that: The cooling device (4) is composed of a connecting bracket (401), a hydraulic lifting structure (402) and a cooling cavity (403); the connecting bracket (401) is fixedly installed at the middle end of the roller table (1), and the connecting bracket (401) is located between two rolling mills (2); the hydraulic lifting structure (402) is fixedly installed at the middle end of the connecting bracket (401), and the extending end of the hydraulic lifting structure (402) is fixedly connected to the middle end of the top surface of the cooling cavity (403).

4. A rolling mill equipment for differential temperature rolling according to claim 3, characterized in that: The cooling cavity (403) is a sealed, high-temperature-resistant metal cavity, and is filled with liquid nitrogen. A connection port is provided on one side of the middle end of the top surface of the cooling cavity (403), and the inner wall of the connection port is fixedly connected to one end of a liquid nitrogen delivery pipe (5), and a storage tank (6) is placed on one side of the base.

5. The rolling mill equipment for differential temperature rolling according to claim 4, characterized in that: A low-temperature resistant solenoid valve is fixedly installed in the connection port, and a second low-temperature resistant solenoid valve is installed in the joint of the storage tank (6), and the low-temperature resistant solenoid valve is of the same model as the second low-temperature resistant solenoid valve.

6. The rolling mill equipment for differential temperature rolling according to claim 5, characterized in that: The top surface of the storage tank (6) is also provided with a connector connected to a pressurizing device.

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