阅读说明：本技术 一种中高碳优钢热轧钢带的缓冷装置及缓冷方法 (Slow cooling device and slow cooling method for medium-high carbon high-quality steel hot-rolled steel strip ) 是由 喻建林 冯小明 杨武兵 吕瑞国 唐小勇 伍小春 刘涛 钟小杰 杨帆 刘志芳 朱永 于 2020-06-28 设计创作，主要内容包括：一种中高碳优钢热轧钢带的缓冷装置及缓冷方法,属于金属材料缓冷技术领域,该缓冷装置中的缓冷坑设置在输送链沟槽的一侧,缓冷坑的外部两侧分别设置运行轨道,其中的盖板Ⅰ和盖板Ⅱ架设在缓冷坑的上方,盖板Ⅰ和盖板Ⅱ滑动连接在运行轨道上,盖板Ⅰ和盖板Ⅱ上下间隔套接配合,与盖板Ⅰ相连的一个滚轮上连接有电机Ⅰ,与盖板Ⅱ相连的一个滚轮上连接有电机Ⅱ,电机Ⅰ与控制箱Ⅰ连接,电机Ⅱ与控制箱Ⅱ连接,本发明的有益效果是,该缓冷装置整体结构牢固耐用,抗撞击性强,使用寿命长,使钢卷堆放平稳,操作的安全系数高,使用该装置进行缓冷改善了中高碳优钢热轧钢带加工性能,使残余冷却应力消除,组织更加均匀,断带率大幅度减少。(A slow cooling device and a slow cooling method for a medium-high carbon high-quality steel hot-rolled steel strip belong to the technical field of slow cooling of metal materials, a slow cooling pit in the slow cooling device is arranged on one side of a conveying chain groove, two sides of the outside of the slow cooling pit are respectively provided with a running track, a cover plate I and a cover plate II are erected above the slow cooling pit, the cover plate I and the cover plate II are connected on the running track in a sliding mode, the cover plate I and the cover plate II are in sleeve fit with each other at intervals, a roller connected with the cover plate I is connected with a motor I, a roller connected with the cover plate II is connected with a motor II, the motor I is connected with a control box I, and the motor II is connected with the control box II. The residual cooling stress is eliminated, the structure is more uniform, and the strip breakage rate is greatly reduced.)

1. The utility model provides a slow cooling device of medium and high carbon high-quality steel hot rolling steel band, its characterized in that includes slow cooling hole (1), orbit (2), to open apron subassembly (3), control box I (4) and control box II (5), slow cooling hole (1) sets up the one side at conveying chain slot (6), the outside both sides of slow cooling hole (1) set up respectively orbit (2), to open apron subassembly (3) including apron I (31), apron II (32), motor I (33) and motor II (34), apron I (31) and apron II (32) erect the top of slow cooling hole (1), apron I (31) and apron II (32) are respectively through gyro wheel (35) sliding connection on orbit (2), apron I (31) and apron II (32) are cup jointed the cooperation at the interval from top to bottom, with be connected with gyro wheel (35) that apron I (31) links to each other are connected with motor (33), and a roller (35) connected with the cover plate II (32) is connected with a motor II (34), the motor I (33) is electrically connected with the control box I (4), and the motor II (34) is electrically connected with the control box II (5).

2. The slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip according to claim 1, characterized in that: be provided with in slow cooling pit (1) with locating component (7) of steel band interval range upon range of location, locating component (7) are along the width direction interval of slow cooling pit (1) is provided with the multiunit, and every group locating component (7) are followed by a plurality of trapezoidal saddles (71) the length direction of slow cooling pit (1) is equidistant arranges and forms.

3. The slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip according to claim 2, characterized in that: the trapezoidal saddle (71) is formed by pouring concrete, a layer of structural steel plate (72) is laid and fixed on the upper surface of the trapezoidal saddle (71), and the thickness of the structural steel plate (72) is 12-16 mm.

4. The slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip according to claim 2, characterized in that: the pit walls on the periphery of the slow cooling pit (1) comprise a reinforced concrete layer (11) and a heat-resistant heat-insulating layer (12), and a plurality of reinforcing hooks (13) are uniformly embedded in the reinforced concrete layer (11) and are connected with the heat-resistant heat-insulating layer (12) through the reinforcing hooks (13).

5. The slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip according to claim 4, characterized in that: the heat-resistant insulating layer (12) is formed by pouring alumina cement, and the thickness of the heat-resistant insulating layer (12) is 200-300 mm.

6. The slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip according to any one of claims 2 to 5, characterized in that: one deck refractory fiber insulating layer (36) have all been laid to the lower surface of apron I (31) and apron II (32), the four corners position of apron I (31) and apron II (32) bottom is provided with fixed bolster (37) respectively, fixed bolster (37) pass through the bearing with gyro wheel (35) link to each other, the clearance in vertical direction between apron I (31) and apron II (32) is 120mm ~ 150 mm.

7. The slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip according to claim 6, characterized in that: orbit (2) include track I (21) and track II (22) that outside-in set gradually, apron I (31) through gyro wheel (35) sliding connection of four corners position on track I (21), apron II (32) through gyro wheel (35) sliding connection of four corners position on track II (22).

8. The slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip according to claim 6, characterized in that: the both ends of slow cooling hole (1) are provided with observation platform (8) respectively, set up on two observation platform (8) respectively control case I (4) and control box II (5), control box I (4) and control box II (5) all include that PLC the control unit, motor open and stop button and motor turn to the switching button, motor on control box I (4) open and stop button and motor turn to the switching button pass through the PLC the control unit with motor I (33) electricity links to each other, motor on control box II (5) open and stop button and motor turn to the switching button pass through the PLC the control unit with motor II (34) electricity links to each other.

9. The slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip according to claim 8, characterized in that: the control box I (4) and the control box II (5) further comprise a display screen, a plurality of thermocouples (9) are arranged in the slow cooling pit (1), the thermocouples (9) are connected in parallel and then connected with the PLC control unit, and the PLC control unit is connected with the display screen through signal transmission.

10. A slow cooling method of a medium-high carbon high-quality steel hot rolled strip, which applies the slow cooling device according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:

1) after the production of the hot-rolled steel strip is finished, a conveying chain conveys the steel coil to the vicinity of a slow cooling pit (1) along a conveying chain groove (6), a motor start-stop button on a control box I (4) is operated to enable a motor I (33) to work, and a cover plate I (31) is driven to slide towards the direction of a cover plate II (32), and the motor I (33) stops working by pressing the motor start-stop button again after the cover plate I (31) runs to the upper side of the cover plate II (32) and is overlapped with the cover plate I (32), so that the left half area of the slow cooling pit (1) is opened;

2) the hot rolled steel coils are transported, stacked and stacked on a positioning component (7) in the left half area of the slow cooling pit (1) by a travelling crane until the left half area is fully stacked; operating a motor steering switching button on the control box I (4), enabling the motor I (33) to rotate reversely and drive the cover plate I (31) to slide towards the direction far away from the cover plate II (32) until the cover plate I (31) completely covers the left half area of the slow cooling pit (1), and pressing a motor start-stop button again to enable the motor I (33) to stop working;

3) a motor start-stop button on the control box II (5) is operated to enable the motor II (34) to drive the cover plate II (32) to slide towards the direction of the cover plate I (31), the motor start-stop button is pressed again to enable the motor II (34) to stop working after the cover plate II (32) runs to the lower part of the cover plate I (31) and is overlapped with the cover plate I (31), and the right half area of the slow cooling pit (1) is opened;

4) the hot rolled steel coils are transported, stacked and stacked on the positioning component (7) of the right half area of the slow cooling pit (1) by a travelling crane until the right half area is fully stacked; operating a motor steering switching button on the control box II (5), enabling the motor II (34) to rotate reversely and driving the cover plate II (32) to slide towards the direction far away from the cover plate I (31) until the cover plate II (32) completely covers the right half area of the slow cooling pit (1), and pressing a motor start-stop button again to stop the motor II (34);

5) after the port of the slow cooling pit (1) is completely covered, the hot-rolled steel coil is slowly cooled in the slow cooling pit (1) for 63-73 h, the temperature of the slow cooling pit (1) detected by the thermocouples (9) is displayed on display screens on the control box I (4) and the control box II (5) in real time until the temperature values of the thermocouples (9) are reduced to 35-65 ℃, the warehouse-out requirement is met, and the hot-rolled steel coil is dispatched and transported out of the warehouse by a crane.

Technical Field

The invention relates to the technical field of slow cooling of metal materials, in particular to a slow cooling device and a slow cooling method for a medium-high carbon high-quality steel hot-rolled steel strip.

Background

The medium-high carbon high-quality steel is a general name of medium-carbon high-quality steel and high-carbon high-quality steel. The medium-carbon high-quality steel refers to high-quality steel with the carbon content of 0.25% -0.60%, and representative steel types include 40Cr, 42CrMoV, 50, 55MnB, 51CrV4 and the like. The high-carbon high-quality steel refers to high-quality steel with the carbon content of 0.60-1.70%, and representative steel types include 60, 75, 65Mn, C67S, SK7, SK85 and the like. After quenching and tempering heat treatment, the medium-high carbon high-quality steel has good obdurability, good fatigue resistance and excellent comprehensive performance, and is widely applied to the fields of engineering machinery, automobiles, electronics, hardware tools and the like.

The plate width of the medium-high carbon high-quality hot rolled steel strip is usually 1100 mm-1250 mm. In domestic cold-rolled strip steel plants, small single-stand cold rolling mills are mostly adopted for cold rolling production, and the effective roll surface width of the rolling mill is 300-600 mm. Therefore, the hot rolled steel strip material needs to be slit before cold rolling. However, the problem of strip breakage of medium-high carbon high-quality steel hot rolled strips often occurs during longitudinal shearing and slitting, and particularly in winter, the strip breakage rate can be increased rapidly. Through research and analysis, the carbon content and the alloy content of the medium-high carbon high-quality hot rolled steel strip are related. The carbon content and the alloy content are high, so that the brittleness of the material is increased, the crack sensitivity is high, the cooling stress is large, and the plasticity is poor, so that the problem of belt breakage is easy to occur during longitudinal shearing and slitting. Particularly in winter, the brittleness of the material is more obvious and the belt breakage is more frequent in a low-temperature environment.

Through investigation, in order to solve the problems of longitudinal shearing, splitting and strip breaking of medium-high carbon high-quality steel hot rolled steel strips and improve the processing performance of materials, a slow cooling treatment method is generally adopted by part of domestic hot continuous rolling mills to improve the processing performance of the materials. The slow cooling treatment method mainly comprises two methods, one is heap cooling, and the other is cover plate type underground slow cooling. The stacking cooling means that after the production of the medium-high carbon high-quality steel hot rolled steel strip is finished, the medium-high carbon high-quality steel hot rolled steel strip is centrally stacked at a certain position of a finished product warehouse and is slowly cooled by utilizing the temperature of the steel strip. The method is the most traditional, simple and convenient, and low in production cost. However, the slow cooling effect is poor, the hot rolled steel strip still has large cooling stress, the problem of strip breakage cannot be solved, and the improvement effect of the processability is poor. At present, most domestic hot continuous rolling mills rarely adopt the slow cooling treatment mode. The cover plate type underground slow cooling is that a cover plate type slow cooling pit is built by adopting refractory bricks at a certain position of a finished product warehouse, wherein a cover plate is movable and needs to be dispatched and transported by a travelling crane. After the production of the medium-high carbon high-quality steel hot rolled steel strip is finished, the travelling crane is adopted to transport the movable cover plate away, then the steel strip is transported to the slow cooling pit in a centralized mode, after the steel strip is placed, the travelling crane is adopted to transport the movable cover plate back and cover the movable cover plate, and therefore the hot rolled steel strip is cooled slowly in the cover plate type slow cooling pit. The slow cooling treatment mode has a certain effect on improving the processing performance of the medium-high carbon high-quality steel hot-rolled steel strip, but has a plurality of defects in the actual production process, firstly, the refractory bricks are adopted to build the heat-resistant heat-insulating layer, the heat-insulating layer is heated and is easy to expand and bulge, the impact resistance effect is poor, and the heat-insulating layer is easy to collapse. And secondly, the movable cover plate is transferred by using the travelling crane, the travelling crane is difficult to lift, the floor is occupied, and the production efficiency is low. Thirdly, the hooking and unhooking in the vehicle dispatching process need close-range operation of staff, so that the risk coefficient is high, and the safety is poor. These problems greatly restrict the popularization and application of the cover plate type underground slow cooling technology.

Disclosure of Invention

In order to solve the technical problems, the invention provides the slow cooling device for the medium-high carbon high-quality steel hot-rolled steel strip, which has the advantages of good slow cooling effect, high slow cooling efficiency, convenience in use, long service life and high safety coefficient, and can improve the processing performance of the medium-high carbon high-quality steel hot-rolled steel strip, eliminate residual cooling stress, make the tissue more uniform, solve the problem of longitudinal shearing and cutting and breaking the strip, and greatly reduce the strip breaking rate.

In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the slow cooling device of well high carbon steel hot rolling steel band, include slow cooling hole, orbit, to open apron subassembly, control box I and control box II, the slow cooling hole sets up the one side at the conveying chain slot, the outside both sides in slow cooling hole set up respectively the orbit, to open apron subassembly including apron I, apron II, motor I and motor II, apron I and apron II erect the top in slow cooling hole, apron I and apron II are respectively through gyro wheel sliding connection on the orbit, the cooperation is cup jointed at the interval about apron I and apron II, with be connected with motor I on the gyro wheel that apron I links to each other, with be connected with motor II on the gyro wheel that apron II links to each other, motor I with I electricity of control box is connected, motor II with II electricity of control box are connected.

Furthermore, positioning components for positioning steel belts in a stacking mode at intervals are arranged in the slow cooling pit, multiple groups of positioning components are arranged at intervals along the width direction of the slow cooling pit, and each group of positioning components is formed by arranging a plurality of trapezoidal saddles at equal intervals along the length direction of the slow cooling pit.

Furthermore, the trapezoidal saddle is formed by pouring concrete, a layer of structural steel plate is laid and fixed on the upper surface of the trapezoidal saddle, and the thickness of the structural steel plate is 12-16 mm.

Furthermore, the peripheral walls of the slow cooling pit comprise a reinforced concrete layer and a heat-resistant insulating layer, and a plurality of reinforcing hooks are uniformly embedded in the reinforced concrete layer and are connected with the heat-resistant insulating layer through the reinforcing hooks.

Furthermore, the heat-resistant insulating layer is formed by pouring alumina cement, and the thickness of the heat-resistant insulating layer is 200-300 mm.

Furthermore, a layer of refractory fiber heat insulation layer is laid on the lower surfaces of the cover plate I and the cover plate II, four corners of the bottoms of the cover plate I and the cover plate II are respectively provided with a fixing support, the fixing supports are connected with the rollers through bearings, and a gap between the cover plate I and the cover plate II in the vertical direction ranges from 120mm to 150 mm.

Further, the operation track includes track I and track II that outside-in set gradually, apron I through the gyro wheel sliding connection of four corners position on track I, apron II through the gyro wheel sliding connection of four corners position on track II.

Further, observation platforms are respectively arranged at two ends of the slow cooling pit, the two observation platforms are respectively provided with a control box I and a control box II, the control box I and the control box II respectively comprise a PLC control unit, a motor start-stop button and a motor steering switching button, the motor start-stop button and the motor steering switching button on the control box I are electrically connected with the motor I through the PLC control unit, and the motor start-stop button and the motor steering switching button on the control box II are electrically connected with the motor II through the PLC control unit.

Furthermore, the control box I and the control box II further comprise display screens, a plurality of thermocouples are arranged in the slow cooling pit and connected with the PLC control unit after being connected in parallel, and the PLC control unit is connected with the display screens in a signal transmission mode.

A slow cooling method for a medium-high carbon high-quality steel hot rolled steel strip applies the slow cooling device, and comprises the following steps:

1) after the production of the hot-rolled steel strip is finished, a steel coil is conveyed to the vicinity of a slow cooling pit along a conveying chain groove by a conveying chain, a motor start-stop button on a control box I is operated to enable a motor I to work and drive a cover plate I to slide towards the direction of a cover plate II, and the motor start-stop button is pressed again to enable the motor I to stop working until the cover plate I runs to the upper part of the cover plate II and is overlapped with the cover plate I, so that the left half area of the slow cooling pit is opened;

2) the hot rolled steel coils are transported, stacked and overlapped on the positioning component in the left half area of the slow cooling pit by using a travelling crane until the left half area is fully stacked; operating a motor steering switching button on the control box I to enable the motor I to rotate reversely and drive the cover plate I to slide in a direction far away from the cover plate II until the cover plate I completely covers the left half area of the slow cooling pit, and pressing a motor start-stop button again to enable the motor I to stop working;

3) a motor start-stop button on the control box II is operated to enable the motor II to drive the cover plate II to slide towards the cover plate I until the cover plate II runs to the lower part of the cover plate I and is overlapped with the cover plate I, the motor start-stop button is pressed again to enable the motor II to stop working, and the right half area of the slow cooling pit is opened;

4) transporting, stacking and stacking the hot-rolled steel coils on the positioning component on the right half area of the slow cooling pit in a stacked mode by using a travelling crane until the right half area is fully stacked; operating a motor steering switching button on the control box II to enable the motor II to rotate reversely and drive the cover plate II to slide in the direction far away from the cover plate I until the cover plate II completely covers the right half area of the slow cooling pit, and pressing down a motor start-stop button again to enable the motor II to stop working;

5) after the port of the slow cooling pit is completely covered, the hot-rolled steel coil is slowly cooled in the slow cooling pit for 63-73 h, the temperature of the slow cooling pit detected by the thermocouples is displayed on the display screens of the control box I and the control box II in real time, and the requirement of delivery is met until the temperature values of the thermocouples are reduced to 35-65 ℃, and the hot-rolled steel coil is delivered out of a warehouse through a crane.

The invention has the beneficial effects that:

1. according to the invention, the split cover plate assembly comprising the cover plate I and the cover plate II is erected above the slow cooling pit, so that the cover plate I and the cover plate II can slide along the running tracks on two sides of the slow cooling pit through the rollers, the motor is connected to one roller on each cover plate, and each motor controls the start, stop and steering switching of the motor through one control box, so that the cover plate I and the cover plate II can be opened and closed.

2. Specifically, a positioning component comprising a plurality of trapezoidal saddles formed by pouring concrete and structural steel plates arranged on the outer surfaces of the trapezoidal saddles are arranged in the slow cooling pit, the trapezoidal saddles are arranged at intervals, hot rolled steel coils are stacked at intervals in a stacking mode, the slow cooling efficiency and effect are improved, the hot rolled steel coils are stacked more stably, and the structural steel plates on the trapezoidal saddles can bear a high-temperature environment, so that the positioning component is firmer and more durable and has strong impact resistance; the pit wall of the slow cooling pit is formed by pouring alumina cement outside the reinforced concrete layer to form a heat-resistant heat-insulating layer, compared with the existing refractory brick heat-insulating layer, the heat-resistant heat-insulating layer has better heat-insulating effect, and the heat-resistant heat-insulating layer is connected with the reinforced concrete layer through a plurality of reinforcing hooks, so that the combination degree between the heat-resistant heat-insulating layer and the reinforced concrete layer is increased, the strength and the stability of the structure are improved, the shock resistance and the collapse resistance are realized, the service life is greatly prolonged, and the secondary maintenance cost is greatly; one deck refractory fiber insulating layer has all been laid to the lower surface of apron I and apron II, has certain clearance between apron I and the apron II in addition, can guarantee that two apron can not influence under the thermal expansion condition and open, has guaranteed the heat preservation effect in slow cooling hole moreover, makes it slowly cool off, has further improved the processing property of steel band.

3. Specifically, wherein be provided with a plurality of thermocouples in the slow cooling pit, the thermocouple is used for the temperature in the real-time detection slow cooling pit, take place to damage when one of them thermocouple, other can also use, the normal clear of temperature measurement work has been guaranteed, when the temperature in the slow cooling pit falls to the temperature that satisfies the coil of strip and ex-warehouse requirement, can pass through the driving handling, realized the real time monitoring to coil of strip slow cooling state, make the demonstration of temperature state more directly perceived, need not the workman and use the temperature measurement instrument to measure, it is more convenient to make temperature measurement.

To sum up, this slow cooling device overall structure is firm durable, and anti striking nature is strong, long service life, and slow cooling is effectual, and slow cooling is efficient, and the coil of strip is stacked steadily, and the factor of safety of operation is high, uses this slow cooling device to carry out slow cooling and has improved well high carbon high-quality steel hot rolling steel band processing property, makes residual cooling stress eliminate, and the tissue is more even, and the strip breakage rate reduces by a wide margin.

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

FIG. 1 is a schematic structural view of a slow cooling device according to the present invention;

FIG. 2 is a top view of the split cover plate assembly of FIG. 1 with the split cover plate assembly removed;

FIG. 3 is a sectional view taken along line A-A of FIG. 1;

fig. 4 is a schematic view of a magnified portion of fig. 1;

FIG. 5 is a control schematic of the present invention;

the labels in the above figures are: 1. the novel thermal insulation structure comprises a cooling buffer pit 11, a reinforced concrete layer 12, a heat-resistant insulation layer 13, a reinforcing hook 2, a running rail 21, a rail I, a rail II, a split cover plate assembly 3, a cover plate I31, a cover plate II 32, a cover plate II 33, a motor I34, a motor II 35, a roller 36, a refractory fiber thermal insulation layer 37, a fixing support 37, a control box I4, a control box II 5, a control box 6, a conveying chain groove 7, a positioning component 71, a trapezoidal saddle 72, a structural steel plate 8, an observation platform 9 and a thermocouple.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The specific implementation scheme of the invention is as follows: as shown in figures 1 and 2, the slow cooling device for the medium-high carbon high-quality steel hot rolled steel strip comprises a slow cooling pit 1, operation tracks 2, a split cover plate assembly 3, a control box I4 and a control box II 5, wherein the slow cooling pit 1 is arranged on one side of a conveying chain groove 6, the operation tracks 2 are respectively arranged on two outer sides of the slow cooling pit 1, the split cover plate assembly 3 comprises a cover plate I31, a cover plate II 32, a motor I33 and a motor II 34, the cover plate I31 and the cover plate II 32 are formed by welding steel plates in a split mode, the cover plate I31 and the cover plate II 32 are erected above the slow cooling pit 1, the cover plate I31 and the cover plate II 32 are respectively connected onto the operation tracks 2 in a sliding mode through rollers 35, the cover plate I31 and the cover plate II 32 are in sleeved fit with one another at an upper-lower interval, the motor I33 is connected onto one roller 35 connected onto the cover plate I31, the roller 35 connected onto the cover plate II 32 is connected with the motor II 34, the motor I33, motor II 34 is connected with II 5 electricity of control box and is used for opening of control motor II 34 to stop and turn to the switching to can realize opening and closing of apron I and apron II, compare with prior art, this scheme has made things convenient for hot rolled steel coil to pile into the slow cooling hole, has increased the security of operation, makes slow cooling effect better, and slow cooling efficiency is higher.

Specifically, as shown in fig. 1, fig. 2 and fig. 4, the positioning components 7 for positioning the steel strips in a spaced and stacked manner are arranged in the slow cooling pit 1, the positioning components 7 are provided with a plurality of groups at intervals along the width direction of the slow cooling pit 1, each group of positioning components 7 is formed by arranging a plurality of trapezoidal saddles 71 at equal intervals along the length direction of the slow cooling pit 1, each trapezoidal saddle 71 is formed by pouring concrete, the hot-rolled steel strips are placed between two adjacent trapezoidal saddles 71, so that the hot-rolled steel strips at the bottommost layer of the slow cooling pit 1 are stacked at intervals, and then the hot-rolled steel strips are stacked upwards continuously in the gaps between the hot-rolled steel strips at the bottommost layer, so that the efficiency and the effect of slow cooling are improved, and the stacking of the. In addition, in order to improve the high temperature resistance, structural firmness and impact resistance of the positioning component 7, a layer of structural steel plate 72 is paved and fixed on the upper surface of the trapezoidal saddle 71, the thickness of the structural steel plate 72 is 12 mm-16 mm, the structural steel plate can bear the high temperature environment of 600 ℃ -700 ℃, the service life of the whole is prolonged, and the cost of secondary maintenance is reduced.

Specifically, as shown in fig. 3, the peripheral walls of the slow cooling pit 1 include a reinforced concrete layer 11 and a heat-resistant insulating layer 12, wherein a plurality of reinforcing hooks 13 are uniformly embedded in the reinforced concrete layer 11 and are connected with the heat-resistant insulating layer 12 through the reinforcing hooks 13, so that the overall structural strength is increased, the impact resistance is high, the slow cooling pit is not easy to collapse, and the service life is greatly prolonged; and the heat-resistant insulating layer 12 is formed by pouring alumina cement, the thickness of the heat-resistant insulating layer 12 is 200 mm-300 mm, and the heat-resistant insulating layer poured by using the alumina cement has a better heat-insulating effect compared with the traditional refractory brick insulating layer through production practice verification.

Specifically, as shown in fig. 3, a layer of refractory fiber thermal insulation layer 36 is laid on the lower surfaces of a cover plate i 31 and a cover plate ii 32, so that a good thermal insulation effect is ensured after the cover plate i 31 and the cover plate ii 32 cover the port of the cooling pit 1, four corners of the bottoms of the cover plate i 31 and the cover plate ii 32 are respectively provided with a fixing bracket 37, the fixing brackets 37 play a role of supporting the cover plate i 31 and the cover plate ii 32, the fixing bracket 37 is connected with a roller 35 through a bearing, a connecting shaft of the roller 35 on the cover plate i 31 is connected with an output shaft of a motor i 33, a connecting shaft of the roller 35 on the cover plate ii 32 is connected with an output shaft of a motor ii 34, wherein the running track 2 comprises a track i 21 and a track ii 22 which are arranged in sequence from outside to inside and are parallel to each other, the cover plate i 31 is slidably connected to the track i 21 through the rollers 35 at the four corners, the motor i, apron II 32 is on II 22 of track through gyro wheel 35 sliding connection of four corners position, slide along II 22 of track through II 34 drive apron II 32 of motor, realized that the blowing is opened to the port of slow cooling hole 1 and the port covers the heat preservation, and the clearance in vertical direction between apron I31 and the apron II 32 is 120mm ~ 150mm, can guarantee that two laps can not influence under the thermal expansion condition and open, can guarantee again that two laps close the back and have good heat preservation effect.

Specifically, as shown in fig. 2 and 5, wherein both ends of pit 1 are provided with observation platform 8 respectively, set up control box I4 and control box II 5 on two observation platform 8 respectively, control box I4 and control box II 5 all include the PLC the control unit, motor start stop button and motor turn to the switching button on the control box I4 pass through the PLC the control unit and link to each other with motor I33 electricity, be used for controlling starting and stopping of motor I33 and turn to the transform, motor start stop button and motor turn to the switching button on the control box II 5 pass through the PLC the control unit and link to each other with motor II 34 electricity, be used for controlling starting and stopping of motor II 34 and turn to the transform. In addition, the control box I4 and the control box II 5 also comprise a display screen, a plurality of thermocouples 9 are arranged in the slow cooling pit 1, the thermocouples 9 can be arranged along the circumferential direction of the slow cooling pit 1, the thermocouples 9 are connected in parallel and then are connected with the PLC control unit, when one thermocouple 9 is damaged, the other thermocouples can also be used, the normal operation of temperature measurement is ensured, the PLC control unit is connected with the display screen in a signal transmission way, the thermocouples 9 are used for detecting the temperature in the slow cooling pit 1 in real time and transmitting the value corresponding to the acquired analog quantity to the display screen through calculation to obtain a temperature value and transmitting the temperature value to the display screen for display until the temperature in the slow cooling pit 1 is reduced to the temperature meeting the steel coil ex-warehouse requirement, namely the steel coil can be lifted by a crane, the real-time monitoring of the slow cooling state of the steel coil is realized, the display of the temperature state is more visual, a temperature measurement tool is not needed by workers, the temperature measurement is more convenient.