Hot strip laminar cooling test device

Abstract

The utility model belongs to hot rolled strip steel laminar cooling technical field especially relates to a kind of hot rolled strip steel laminar cooling test device, including annular cooling tank, rotating platform being arranged in annular cooling tank inside, water tray being arranged below annular cooling tank, cooling water pipe support being arranged above rotating platform, water spraying device being arranged on cooling water pipe support and being located annular cooling tank directly above, several water outlets and strip steel grooves being arranged in the bottom of annular cooling tank, thermocouple and offline temperature recorder being arranged above rotating platform, infrared thermometer being arranged in the periphery of annular cooling tank.The utility model simulates the scene of strip steel in production process water cooling, adjusts the speed of annular cooling tank, controls strip steel cooling time;Strip steel groove adopts heat preservation material to completely wrap non-water cooling surface, greatly reduces the heat loss of non-water cooling surface;In addition, the heat preservation material is waterproofed, so that the heat preservation material is always in dry state, to ensure heat insulation effect.

Description

Technical Field

[0001] This utility model belongs to the field of laminar flow cooling technology for hot-rolled strip steel, and in particular relates to a laminar flow cooling test device for hot-rolled strip steel. Background Technology

[0002] Hot-rolled strip steel is used in industrial production and social life for the production of automotive sheet metal, electrical components, and in the construction industry. During the production of hot-rolled strip steel, temperature control during the cooling process is crucial, as the rationality of the cooling process significantly affects the formation of the internal microstructure of the strip steel, including austenite, ferrite, martensite, and bainite, as well as performance indicators such as yield strength, tensile strength, and impact thermal properties.

[0003] During continuous rolling, after the strip head emerges from the last stand, it passes through multiple cooling manifolds of varying numbers, depending on the grade and thickness, and the rolling speed. The water pressure and flow rate in these manifolds are pre-set by the cooling process and controlled by on / off valves. Each manifold is equipped with multiple circular or flat nozzles for water spray cooling. Temperature sensors are installed before and after the cooling zone to measure the surface temperature of the rolled piece and provide real-time feedforward and feedback control. As the water flows out at high speed from the nozzles, it creates a jet impact on the strip surface, forming a forced convection zone, a laminar flow zone separated by a steam layer, and a thermal radiation dissipation zone. Due to the different heat transfer modes and properties of each zone, the cooling capacity varies considerably.

[0004] Currently, two methods are commonly used when conducting cooling tests on new grades or specifications: 1. Online method. This method has three disadvantages: firstly, it is costly; secondly, it cannot accurately measure the temperature change of the strip during the cooling process in real time; and finally, it cannot measure the internal temperature of the strip. 2. Offline method: After heating the strip, the cooling process is manually controlled. Due to space limitations, this method is difficult to fully simulate the alternating cooling process of the manifold at different speeds and the cooling capacity of each zone under jet impact. It also cannot accurately reproduce the actual situation of the strip during water cooling, and it does not fully consider the residual water on the strip surface and the conveying speed. Therefore, the experimental data is not accurate and deviates from actual production conditions. In conclusion, the testing and temperature measurement methods for the cooling process of hot-rolled strip need improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a laminar flow cooling test device for hot-rolled strip steel, which aims to highly reproduce the temperature changes during the cooling process of strip steel within a limited space.

[0006] The objective of this utility model is achieved through the following technical solution: The present invention relates to a laminar flow cooling test device for hot-rolled strip steel, characterized in that it includes an annular cooling tank, a rotating platform disposed inside the annular cooling tank, a water-holding tray disposed below the annular cooling tank, a cooling water pipe support disposed above the rotating platform and supported on the periphery of the annular cooling tank, a water spray device disposed on the cooling water pipe support and located directly above the annular cooling tank, several water outlets and strip grooves disposed at the bottom of the annular cooling tank, a thermocouple and an offline temperature recorder disposed above the rotating platform, and an infrared thermometer disposed on the periphery of the annular cooling tank. This infrared thermometer is used to monitor the surface temperature of the sample and feed the temperature data back to the on-site control host. The water tray collects cooling water and transfers it to a storage tank via pipes.

[0007] The water spraying device includes a water spray pipe, a water spray nozzle at the end of the water spray pipe, and a throttling valve on the water spray pipe. The water spray pipe is connected to the water storage tank through a water pump to realize water recycling.

[0008] The outlet diameter of the spray nozzle is 5mm-10mm.

[0009] The water outlet trough is a longitudinally curved flat structure evenly distributed along the bottom edge of the annular cooling trough. Each water outlet trough has a boss inside, and a baffle plate is provided on the boss. The shape of the baffle plate matches the shape of the water outlet trough.

[0010] The number of water outlet tanks is 3-10.

[0011] The thermocouple and the patch of the offline temperature recorder are connected to the experimental steel strip and placed in the groove of the steel strip to monitor the internal temperature of the sample.

[0012] The drive device of the rotating platform is connected to the field control host.

[0013] The cooling water pipe support mainly consists of longitudinal beams and transverse beams.

[0014] Advantages of this utility model: (1) The hot-rolled strip steel layer cooling test device of this utility model provides an annular cooling groove that is welded together to form a whole. The strip steel groove is completely wrapped with insulation material to greatly reduce the heat loss of the non-water-cooled surface. In addition, the insulation material is waterproofed to keep the insulation material dry and ensure the insulation effect. (2) The hot-rolled strip steel layer cooling test device of this utility model greatly simulates the water cooling scenario of strip steel in the production process. The drive equipment can adjust the rotation speed of the annular cooling tank, thereby controlling the cooling time of the strip steel. The water outlet at the bottom of the annular cooling tank is equipped with a baffle plate, which can control the amount of residual water on the surface of the strip steel during the water cooling process. (3) The hot-rolled strip cold test device of this utility model is simple in design, easy to operate and has low experimental cost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This utility model Figure 1 A diagram from another direction. Detailed Implementation

[0017] The specific embodiments of this utility model are further described below with reference to the accompanying drawings.

[0018] like Figure 1 and 2 As shown, the hot-rolled strip laminar flow cooling test device of this utility model includes an annular cooling tank 1, a rotating platform 8 disposed inside the annular cooling tank 1, a water tray 11 disposed below the annular cooling tank 1, a cooling water pipe support disposed above the rotating platform 8 and supported on the periphery of the annular cooling tank 1, a water spraying device disposed on the cooling water pipe support and located directly above the annular cooling tank 1, several water outlets 5 and strip grooves 6 disposed at the bottom of the annular cooling tank 1, a thermocouple and an offline temperature recorder 15 disposed above the rotating platform 8, and an infrared thermometer 14 disposed on the periphery of the annular cooling tank 1. The infrared thermometer 14 is used to monitor the surface temperature of the sample and feed the temperature data back to the on-site control host. The water tray 11 collects cooling water and transfers it to the water storage tank 9 through a pipe.

[0019] The water spraying device includes a water spray pipe, a water spray nozzle 3 at the end of the water spray pipe, and a throttle valve 12 on the water spray pipe. The water spray pipe is connected to the water storage tank 9 through a water pump 13 to realize water recycling.

[0020] The thickness is 5mm-10mm.

[0021] The water outlet trough 5 is a longitudinally curved flat structure evenly distributed along the bottom edge of the annular cooling tank 1. Each water outlet trough 5 has a boss inside, and a baffle plate 4 is provided on the boss. The shape of the baffle plate 4 matches the shape of the water outlet trough 5.

[0022] The number of water outlet tanks 5 is 3-10.

[0023] The thermocouple and the patch of the offline temperature recorder 15 are connected to the experimental strip workpiece 7 and placed in the strip groove 6 to monitor the internal temperature of the sample.

[0024] The drive device of the rotating platform 8 is connected to the field control host.

[0025] The cooling water pipe support mainly consists of a cooling water pipe support longitudinal beam 10 and a cooling water pipe support cross beam 2.

[0026] The groove 6 of the steel strip is filled with thermal insulation material around its perimeter and bottom.

[0027] The insulation material is either ceramic fiber board or asbestos board.

[0028] The specially designed annular cooling tank 1, insulation material, thermocouple and offline temperature recorder 15, and water outlet tank 5 are all integrated into a whole through processing. The steel groove 6 is completely wrapped with insulation material to greatly reduce heat loss from the non-water-cooled surface. In addition, the insulation material is waterproofed to keep it dry and ensure the insulation effect.

[0029] The water spraying device regulates the water volume through the outlet diameter of the spray nozzle 3 and the throttle valve 12.

[0030] This embodiment discloses a cold-testing device for hot-rolled strip steel. The testing device includes an annular cooling tank 1. The heated test strip steel workpiece 7 is placed in a strip steel groove 6. The four walls of the strip steel groove are lined with heat-insulating material. A rotating platform 8 is rotated by a drive device inside the base. A water spraying device located above sprays water onto the surface of the test strip steel workpiece 7 through spray nozzles 3. A thermocouple and an offline temperature recorder 15 located above the rotating platform 8 and an infrared thermometer 14 located above the annular cooling tank 1 measure the internal and surface temperature of the strip steel. The on-site control host controls the rotation speed of the drive device and the water spray flow rate based on the feedback temperature signal. There are several water outlets 5 on the annular cooling tank 1. The amount of residual water on the surface of the test strip steel workpiece 7 is controlled by controlling the number of water outlets 5.

[0031] The specific parameters of the specially designed annular cooling tank 1 in the strip water-cooled temperature measurement and testing device are as follows: (1) The width of the annular cooling tank 1 is 3cm-5cm and the radius of the ring is 20cm-40cm; (2) The strip groove 6 is 1.5m long and 3cm wide, and is used to place the strip. The inner wall of the strip groove 6 is reserved with micro holes (to place thermocouple probes). The strip groove 6 is filled with insulation material around its perimeter and bottom. (3) The insulation material is ceramic fiber board or asbestos board.

[0032] The temperature measurement method for a strip steel water-cooling device specifically includes the following steps: (1) Heat the experimental strip steel workpiece 7 to the target temperature and place it in the strip steel groove 6; (2) Determine the rotation speed; (3) Adjust the spray angle to determine the number of water outlets to be opened in water outlet tank 5; (4) Start the drive equipment and judge the relationship between the nozzle tilt angle, water flow rate and cooling performance during the water cooling process of the experimental strip steel workpiece 7 by measuring the temperature change through thermocouples and offline temperature recorder 15.

[0033] This utility model provides a hot-rolled strip cooling test device. The various parts of the annular cooling tank are welded together to form a whole. The strip groove is completely wrapped with insulation material to minimize heat loss from the non-water-cooled surface. In addition, the insulation material is waterproofed to keep it dry and ensure its heat insulation effect. It greatly simulates the water cooling scenario of strip during production. The drive equipment can adjust the rotation speed of the annular cooling tank to control the cooling time of the strip. The water outlet at the bottom of the annular cooling tank is equipped with a baffle to control the amount of residual water on the surface of the strip during water cooling. The device is simple in design, easy to operate, and has low experimental cost.

Claims

1. A laminar flow cooling test device for hot-rolled strip steel, characterized in that, The system includes an annular cooling tank, a rotating platform located inside the annular cooling tank, a water tray located below the annular cooling tank, a cooling water pipe support located above the rotating platform and supported on the periphery of the annular cooling tank, a water spray device located on the cooling water pipe support and directly above the annular cooling tank, several water outlets and a steel strip groove located at the bottom of the annular cooling tank, a thermocouple and an offline temperature recorder located above the rotating platform, and an infrared thermometer located on the periphery of the annular cooling tank. This infrared thermometer is used to monitor the surface temperature of the sample and feed the temperature data back to the field control host. The water tray collects cooling water and transfers it to a storage tank via pipes.

2. The laminar flow cooling test apparatus for hot-rolled strip steel according to claim 1, characterized in that, The water spraying device includes a water spray pipe, a water spray nozzle at the end of the water spray pipe, and a throttling valve on the water spray pipe. The water spray pipe is connected to the water storage tank through a water pump to realize water recycling.

3. The laminar flow cooling test apparatus for hot-rolled strip steel according to claim 2, characterized in that, The outlet diameter of the spray nozzle is 5mm-10mm.

4. The laminar flow cooling test apparatus for hot-rolled strip steel according to claim 1, characterized in that, The water outlet trough is a longitudinally curved flat structure evenly distributed along the bottom edge of the annular cooling trough. Each water outlet trough has a boss inside, and a baffle plate is provided on the boss. The shape of the baffle plate matches the shape of the water outlet trough.

5. The laminar flow cooling test apparatus for hot-rolled strip steel according to claim 1, characterized in that, The number of water outlet tanks is 3-10.

6. The laminar flow cooling test apparatus for hot-rolled strip steel according to claim 1, characterized in that, The thermocouple and the patch of the offline temperature recorder are connected to the experimental steel strip and placed in the groove of the steel strip to monitor the internal temperature of the sample.

7. The laminar flow cooling test apparatus for hot-rolled strip steel according to claim 1, characterized in that, The drive device of the rotating platform is connected to the field control host.

8. The laminar flow cooling test apparatus for hot-rolled strip steel according to claim 1, characterized in that, The cooling water pipe support mainly consists of longitudinal beams and transverse beams.

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