Testing device for detecting temperature influence of blank water beam black print

Abstract

The utility model discloses a testing device for detecting the temperature influence of a blank water beam black print, which comprises an experimental blank and a fixed box, one end of the experimental blank is provided with a notch, the fixed box is embedded in the notch, and the top of the fixed box is provided with a fixed box cover plate. According to the utility model, through the design that holes are formed in the experimental plate blank, the positions of a movable beam straight beam section water beam, a movable beam turning section water beam, a static beam straight beam section water beam, a static beam turning section water beam and a non-water beam are corresponding, and a detection device with a high temperature prevention design is matched, so that the temperature data of the plate blank in the furnace in the water beam position or other positions in the heating process are directly detected and collected; data support is provided for analyzing the change rule of the slab water beam black print temperature in the heating process, optimizing the heating process of the heating furnace and improving the uniformity of the slab heating temperature, the heating process of the heating furnace is adjusted and optimized in time according to detection data, the uniformity of the slab heating temperature is improved, the qualified rate of products is improved, and the production cost is reduced. Good economic benefits are created, and the test cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hot-rolled strip steel heating furnaces, in particular to a testing device for detecting the temperature influence of black marks on slab water beams. Background Art

[0002] In the production process of hot-rolled strip steel, the walking-beam heating furnace is a very important piece of equipment. It is related to the smooth production and output, and also affects the quality of the final product due to the temperature control accuracy. The walking-beam heating furnace uses a moving beam and a static beam to alternately carry and transport the slab: the moving beam is fixed to the translation frame, and the moving beam is lifted to move the slab horizontally to the next station of the static beam; then the moving beam is lowered and returned; when the moving beam repeats the action, the slab is heated while moving forward in the furnace. The walking-beam heating furnace uses a cooling method that arranges cooling water or steam pipes in the moving beam and static beam to ensure the thermal stability of each beam and extend the service life of each beam. Therefore, the moving beam and static beam are collectively referred to as water beams. The slab is in direct contact with the pad above the water beam in the heating furnace. The pad is welded to the cooling pipe wall of the water beam, and circulating water or steam-water mixture is continuously passed into the cooling pipe for cooling, resulting in a relatively low temperature at the contact point between the slab and the water beam pad. In addition, the water beam blocks the radiant heat transfer, resulting in local low temperature at the contact point between the slab and the pad, and the color is darker than other positions, forming a black mark on the slab water beam.

[0003] The presence of black marks on slab water beams will have a significant impact on the dimensional accuracy and performance of the finished strip steel, especially for temperature-sensitive non-oriented silicon steel, which has poor thermal conductivity and more serious black marks on slab water beams than other steel grades, causing rolling force fluctuations and resulting in thickness fluctuations of hot-rolled silicon steel coils. Figure 4 As shown; In addition, the temperature of the black mark position of the water beam of non-oriented silicon steel slab is relatively low, and the precipitates such as MnS and AlN are less melted back, resulting in the fluctuation of iron loss after annealing of cold-rolled non-oriented silicon steel, such as Figure 5 Although the water beam design has a bend in the soaking section, as shown in Figure 6 As shown, it is expected that the black water mark on the slab before the soaking section can be reduced. However, if the process parameters such as the heating temperature and heating time of each section in the furnace are not set accurately, not only will the black water mark on the slab before the soaking section not be significantly reduced, but new black water mark on the slab will appear after the water beam turns. Therefore, it is necessary to detect the temperature and changes of the black water mark on the slab during the heating process to provide data support for accurately setting the process parameters of the heating furnace and reducing the black water mark on the slab.

[0004] Currently, the slab temperature in each section of a heating furnace is calculated using modeling and furnace temperature measurements from thermocouples in the corresponding section. However, there is no direct method for measuring the precise temperature of the slab at the water beam. A test device for detecting the temperature impact of the black mark on the slab water beam was developed to precisely measure the slab temperature at this localized area, thereby testing the impact of the heating furnace and its heating process on the slab. Utility Model Content

[0005] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned prior art and provide a test device for detecting the temperature influence of the black mark of the water beam of the slab. Through the design of the experimental slab opening holes, corresponding to the water beam of the straight beam section of the moving beam, the water beam of the bending section of the moving beam, the water beam of the straight beam section of the static beam, the water beam of the bending section of the static beam and the non-water beam positions, and in conjunction with the detection device with high-temperature protection design, it is possible to directly detect and collect the temperature data of the slab in the furnace at the water beam position or other positions during the heating process, provide data support for analyzing the changing law of the black mark temperature of the water beam of the slab during the heating process, optimize the heating process of the heating furnace, and improve the uniformity of the heating temperature of the slab, thereby solving the problems raised in the background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A test device for detecting the temperature influence of black mark on slab water beam comprises a test slab and a fixed box, wherein a notch is provided at one end of the test slab, the fixed box is embedded in the notch, a fixed box cover is installed on the top of the fixed box, and a heat insulation component is provided inside the fixed box;

[0008] The upper surface of the experimental slab is provided with a first temperature measuring hole, a second temperature measuring hole, a third temperature measuring hole, a fourth temperature measuring hole and a fifth temperature measuring hole, and the first temperature measuring hole, the second temperature measuring hole, the third temperature measuring hole, the fourth temperature measuring hole and the fifth temperature measuring hole correspond to the water beam of the moving beam straight beam section, the water beam of the moving beam turning section, the water beam of the static beam straight beam section, the water beam of the static beam turning section and the non-water beam position respectively;

[0009] An insulated water tank is fixed between the two side walls inside the fixed box, and a furnace temperature tracker is installed inside the insulated water tank. The connection end of the furnace temperature tracker is electrically connected to a thermocouple. A thermocouple wire groove is opened at the front of the fixed box, and the transmission line of the thermocouple is led out from the thermocouple wire groove. The thermocouple is respectively connected to the first temperature measuring hole, the second temperature measuring hole, the third temperature measuring hole, the fourth temperature measuring hole and the fifth temperature measuring hole through five temperature sensing elements.

[0010] Preferably, the fixing box is configured as an inverted trapezoidal structure, the cross-sectional shape of the notch is an inverted trapezoidal shape matching the fixing box, and the fixing box is fixed at the notch of the test slab.

[0011] Preferably, the heat insulation assembly includes a heat insulation cylinder, the furnace temperature tracker is installed inside the heat insulation cylinder, and both ends of the heat insulation cylinder are sealed and attached to the two side walls of the middle position of the fixed box;

[0012] A water storage chamber is formed between the outer wall of the insulation cylinder and the inner wall of the insulation water tank, and the water storage chamber is filled with clean water. A filling chamber is formed between the outer wall of the insulation water tank and the inner wall of the fixed box, and the filling chamber is filled with refractory filling. The top of the filling chamber is pressed by the fixed box cover.

[0013] Preferably, an exhaust hole is provided on the top of the thermal insulation water tank for discharging the evaporated water vapor in the water storage chamber.

[0014] Preferably, the refractory filler is made of zirconium-containing ceramic fiber refractory wool.

[0015] Preferably, the fixed box and the fixed box cover are both welded from Q235B steel, and the thickness of the Q235B steel is set to 20-40 mm.

[0016] Preferably, the thermocouple is configured as an armored K-type thermocouple.

[0017] Preferably, the insulated water tank and the heat-insulating cylinder are both made of heat-resistant stainless steel, and an aerogel insulation layer is attached to the inner wall of the heat-insulating cylinder.

[0018] Preferably, the depths of the first temperature measuring hole, the second temperature measuring hole, the third temperature measuring hole, the fourth temperature measuring hole and the fifth temperature measuring hole are opened to 10-30 mm from the lower surface of the test slab.

[0019] Preferably, the five temperature sensing elements of the thermocouple are respectively inserted into the deepest parts of the first temperature measuring hole, the second temperature measuring hole, the third temperature measuring hole, the fourth temperature measuring hole and the fifth temperature measuring hole, and the temperature sensing elements are fixed to the experimental slab.

[0020] The utility model has the following beneficial effects:

[0021] Through the design of experimental slab opening holes, corresponding to the water beam of the moving beam straight section, the water beam of the moving beam bending section, the water beam of the static beam straight section, the water beam of the static beam bending section and the non-water beam position, and in conjunction with the detection device with high temperature protection design, it is possible to directly detect and collect the temperature data of the slab in the furnace at the water beam position or other positions during the heating process. The detection data is accurate and has a small error, which provides data support for analyzing the temperature change law of the black mark of the slab water beam during the heating process, optimizing the heating process of the heating furnace, and improving the uniformity of the slab heating temperature. According to the detection data, the heating process of the heating furnace is adjusted and optimized in time, thereby improving the uniformity of the slab heating temperature, improving the qualified rate of the product, and creating better economic benefits;

[0022] By cutting an inverted trapezoidal notch at the end of the experimental slab, the fixed box also adopts a corresponding inverted trapezoidal design and is installed at this notch, which can not only reduce the risk of the detection device hitting the furnace door, but also prevent the detection device from falling into the bottom of the heating furnace due to welding failure at high temperature. The multiple high-temperature protection treatments such as water evaporation from the insulation water tank to remove heat, refractory wool and the fixed box cover to isolate heat from entering ensure that the furnace temperature tracker can be used for a long time at high temperature. The device of the utility model has a simple structure, is easy to install and replace, has a low cost of use, and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A diagram showing the structure of the test device provided by the utility model in use;

[0024] Figure 2 For this utility model Figure 1 The structure A shown shows the local structure;

[0025] Figure 3 For this utility model Figure 1 The structure shown is the BB cross-sectional structure diagram;

[0026] Figure 4 This is a thickness fluctuation diagram of a hot-rolled non-oriented silicon steel product according to an embodiment of the prior art;

[0027] Figure 5 This is a graph showing the iron loss fluctuation of a finished product of cold-rolled non-oriented silicon steel after annealing in an embodiment of the prior art;

[0028] Figure 6 This is a schematic diagram of the water beam turning arrangement of an embodiment in the prior art.

[0029] Among them are:

[0030] 1. Experimental slab; 2. Fixed box; 3. Thermocouple; 4. Moving beam water beam; 5. Static beam water beam; 6. Furnace wall; 7. Fifth temperature measuring hole; 8. Insulated water tank exhaust hole; 9. Fixed box cover; 10. Insulated water tank; 11. Furnace temperature tracker; 12. Filling chamber; 13. Thermocouple wire duct; 14. Insulation cylinder; 15. Water storage chamber;

[0031] 4-1, first temperature measuring hole; 4-2, second temperature measuring hole;

[0032] 5-1, the third temperature measuring hole; 5-2, the fourth temperature measuring hole. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0034] In the description of the present invention, it should be understood that the terms "left side," "right side," "upper," "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Terms such as "first" and "second" do not indicate the importance of a component and therefore should not be construed as limiting the present invention. The specific dimensions used in this embodiment are merely for illustrative purposes and do not limit the scope of protection of the present invention.

[0035] like Figure 1-3 The test device for detecting the temperature effect of black mark on slab water beam shown in the figure comprises a test slab 1 and a fixed box 2. A notch is formed at one end of the test slab 1, and the fixed box 2 is embedded in the notch. A fixed box cover 9 is installed on the top of the fixed box 2. Preferably, the end of the fixed box cover 9 is hinged to the fixed box 2, and the other end of the fixed box cover 9 is fastened to the fixed box 2 by a locking pin.

[0036] The upper surface of the experimental slab 1 is provided with a first temperature measuring hole 4-1, a second temperature measuring hole 4-2, a third temperature measuring hole 5-1, a fourth temperature measuring hole 5-2 and a fifth temperature measuring hole 7, and the first temperature measuring hole 4-1, the second temperature measuring hole 4-2, the third temperature measuring hole 5-1, the fourth temperature measuring hole 5-2 and the fifth temperature measuring hole 7 correspond to the water beam of the straight beam section of the moving beam, the water beam of the bending section of the moving beam, the water beam of the straight beam section of the static beam, the water beam of the bending section of the static beam and the non-water beam positions respectively;

[0037] An insulation water tank 10 is fixed between the two side walls inside the fixed box 2, and a furnace temperature tracker 11 is installed inside the insulation water tank 10. A heat insulation component is provided inside the fixed box 2 to protect the furnace temperature tracker 11;

[0038] As a preferred embodiment of the heat insulation assembly, it includes a heat insulation cylinder 14, the furnace temperature tracker 11 is installed inside the heat insulation cylinder 14, and the two ends of the heat insulation cylinder 14 are sealed and attached to the two side walls of the middle position of the fixed box 2;

[0039] A water storage chamber 15 is formed between the outer wall of the heat-insulating cylinder 14 and the inner wall of the heat-insulating water tank 10. The water storage chamber 15 is filled with clean water. A filling chamber 12 is formed between the outer wall of the heat-insulating water tank 10 and the inner wall of the fixed box 2. The filling chamber 12 is filled with refractory filling material. The top of the filling chamber 12 is pressed tightly by the fixed box cover 9.

[0040] The connection end of the furnace temperature tracker 11 is electrically connected to the thermocouple 3. A thermocouple wire slot 13 is provided at the front of the fixed box 2. The transmission line of the thermocouple 3 is led out from the thermocouple wire slot 13. The thermocouple 3 is connected to the first temperature measuring hole 4-1, the second temperature measuring hole 4-2, the third temperature measuring hole 5-1, the fourth temperature measuring hole 5-2 and the fifth temperature measuring hole 7 respectively through five temperature sensing elements;

[0041] When the test device is placed inside the furnace body, the test slab 1 is located in the middle of the furnace walls 6 on both sides of the furnace body.

[0042] Specifically, the fixing box 2 is configured as an inverted trapezoidal structure, the cross-sectional shape of the notch is an inverted trapezoidal shape matching the fixing box 2 , and the fixing box 2 is fixed at the notch of the test slab 1 .

[0043] Specifically, an exhaust hole 8 is provided on the top of the insulated water tank 10 for discharging the evaporated water vapor in the water storage chamber 15, which can take away the heat, prevent the furnace temperature tracker 11 from being damaged at high temperature, improve the safety of the device, and operate the furnace temperature tracker 11 in a stable temperature environment to reduce working errors.

[0044] Specifically, the refractory filler is made of zirconium-containing ceramic fiber refractory wool.

[0045] Specifically, the fixed box 2 and the fixed box cover 9 are both welded from Q235B steel, and the thickness of the Q235B steel is set to 20-40 mm, preferably 30 mm.

[0046] Specifically, the thermocouple 3 is configured as an armored K-type thermocouple, and the armor material is GH3030 alloy with a diameter of 6 mm. The thermocouple 3 is a disposable item and is replaced after each measurement.

[0047] Specifically, the insulated water tank 10 and the heat-insulating cylinder 14 are both made of heat-resistant stainless steel, and an aerogel insulation layer is attached to the inner wall of the heat-insulating cylinder 14 .

[0048] Specifically, the depths of the first temperature measuring hole 4 - 1 , the second temperature measuring hole 4 - 2 , the third temperature measuring hole 5 - 1 , the fourth temperature measuring hole 5 - 2 and the fifth temperature measuring hole 7 are opened to 10-30 mm from the lower surface of the test slab 1 .

[0049] Specifically, the five temperature sensing elements of the thermocouple 3 are respectively inserted into the deepest parts of the first temperature measuring hole 4 - 1 , the second temperature measuring hole 4 - 2 , the third temperature measuring hole 5 - 1 , the fourth temperature measuring hole 5 - 2 and the fifth temperature measuring hole 7 , and the temperature sensing elements are fixed to the experimental slab 1 .

[0050] When the utility model is used, a fixing box 2 with a detection component and a heat-insulating component is installed on the experimental slab 1, and a furnace temperature tracker 11 and a thermocouple 3 are combined into a detection device. The five temperature sensing elements of the detection device are respectively connected to the first temperature measuring hole 4-1, the second temperature measuring hole 4-2, the third temperature measuring hole 5-1, the fourth temperature measuring hole 5-2 and the fifth temperature measuring hole 7 and fixed. Then, the detection device is placed in a heating furnace. It is required that the experimental slab 1 is located in the middle of the furnace, that is, the positions of both ends from the furnace walls 6 on both sides are the same. After being taken out of the furnace, the furnace temperature tracker 11 is taken out and the detection data is exported.

[0051] Comparison based on test data shows that compared with the temperature at non-water beam positions: the maximum temperature difference of the black mark on the water beam of the slab in the straight beam section is: 20°C in the preheating section, 26°C in the first heating section, 163°C in the second heating section, 54°C in the soaking section, and 42°C out of the furnace; the maximum temperature difference of the black mark on the water beam of the bend section is: 45°C in the soaking section, and 22°C out of the furnace;

[0052] Based on the above test data, the heating process of the heating furnace was adjusted and optimized, and then the test was carried out again. The test results showed that compared with the temperature at the non-water beam position: the maximum temperature difference of the black mark of the water beam of the slab in the straight beam section dropped to 53°C (second heating section), and the temperature difference out of the furnace dropped to 16°C; the maximum temperature difference of the black mark of the water beam in the bend section was 18°C (heating section), and the temperature difference out of the furnace dropped to 12°C;

[0053] Repeated tests have verified that by adjusting and optimizing the heating process of the heating furnace, the temperature difference between the black mark temperature of the water beam and the temperature of the non-water beam position can be greatly reduced, and only the thermocouple 3 needs to be replaced, which is low in cost.

[0054] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A testing device for detecting the temperature influence of black mark on slab water beam, characterized by: The invention comprises an experimental slab (1) and a fixed box (2), wherein a notch is provided at one end of the experimental slab (1), the fixed box (2) is embedded in the notch, a fixed box cover (9) is installed on the top of the fixed box (2), and a heat insulation component is provided inside the fixed box (2); The upper surface of the experimental slab (1) is provided with a first temperature measuring hole (4-1), a second temperature measuring hole (4-2), a third temperature measuring hole (5-1), a fourth temperature measuring hole (5-2) and a fifth temperature measuring hole (7), and the first temperature measuring hole (4-1), the second temperature measuring hole (4-2), the third temperature measuring hole (5-1), the fourth temperature measuring hole (5-2) and the fifth temperature measuring hole (7) correspond to the water beam of the straight beam section of the moving beam, the water beam of the turning section of the moving beam, the water beam of the straight beam section of the static beam, the water beam of the turning section of the static beam and the non-water beam positions respectively; An insulating water tank (10) is fixed between the two side walls inside the fixed box (2), and a furnace temperature tracker (11) is installed inside the insulating water tank (10). The connection end of the furnace temperature tracker (11) is electrically connected to a thermocouple (3). A thermocouple wire groove (13) is opened at the front of the fixed box (2). The transmission line of the thermocouple (3) is led out from the thermocouple wire groove (13). The thermocouple (3) is respectively connected to the first temperature measuring hole (4-1), the second temperature measuring hole (4-2), the third temperature measuring hole (5-1), the fourth temperature measuring hole (5-2) and the fifth temperature measuring hole (7) through five temperature sensing elements.

2. A testing device for detecting the temperature influence of black mark on slab water beam according to claim 1, characterized in that: The fixing box (2) is configured as an inverted trapezoidal structure, the cross-sectional shape of the notch is an inverted trapezoidal shape that matches the fixing box (2), and the fixing box (2) is fixed at the notch of the experimental slab (1).

3. The testing device for detecting the temperature influence of black mark on slab water beam according to claim 1, characterized in that: The heat insulation assembly includes a heat insulation cylinder (14), the furnace temperature tracker (11) is installed inside the heat insulation cylinder (14), and both ends of the heat insulation cylinder (14) are sealed and attached to the two side walls of the middle position of the fixed box (2); A water storage chamber (15) is formed between the outer wall of the heat-insulating cylinder (14) and the inner wall of the heat-insulating water tank (10), and the water storage chamber (15) is filled with clean water. A filling chamber (12) is formed between the outer wall of the heat-insulating water tank (10) and the inner wall of the fixed box (2), and the filling chamber (12) is filled with refractory filling. The top of the filling chamber (12) is pressed tightly by the fixed box cover (9).

4. The testing device for detecting the temperature influence of black mark on slab water beam according to claim 3, characterized in that: The top of the thermal insulation water tank (10) is provided with an exhaust hole (8) for exhausting evaporated water vapor in the water storage chamber (15).

5. The testing device for detecting the temperature influence of black mark on slab water beam according to claim 3, characterized in that: The refractory filler is made of zirconium-containing ceramic fiber refractory wool.

6. The testing device for detecting the temperature influence of black mark on slab water beam according to claim 1, characterized in that: The fixed box (2) and the fixed box cover (9) are both welded from Q235B steel, and the thickness of the Q235B steel is set to 20-40 mm.

7. The testing device for detecting the temperature influence of black mark on slab water beam according to claim 1, characterized in that: The thermocouple (3) is configured as an armored K-type thermocouple.

8. The testing device for detecting the temperature influence of black mark on slab water beam according to claim 1, characterized in that: The heat-insulating water tank (10) and the heat-insulating cylinder (14) are both made of heat-resistant stainless steel, and an aerogel heat-insulating layer is attached to the inner wall of the heat-insulating cylinder (14).

9. The testing device for detecting the temperature influence of black mark on slab water beam according to claim 1, characterized in that: The depths of the first temperature measuring hole (4-1), the second temperature measuring hole (4-2), the third temperature measuring hole (5-1), the fourth temperature measuring hole (5-2) and the fifth temperature measuring hole (7) are opened to a position 10-30 mm from the lower surface of the test slab (1).

10. The testing device for detecting the temperature influence of black mark on slab water beam according to claim 8, characterized in that: The five temperature sensing elements of the thermocouple (3) are respectively inserted into the deepest parts of the first temperature measuring hole (4-1), the second temperature measuring hole (4-2), the third temperature measuring hole (5-1), the fourth temperature measuring hole (5-2) and the fifth temperature measuring hole (7), and the temperature sensing elements are fixed to the experimental slab (1).

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