Slow cooling pit in metallurgical continuous casting workshop

Abstract

A slow cooling pit in a metallurgical continuous casting workshop includes a slow cooling pit body, on which are arranged: anti-collision piles, which are arranged on the inner wall of the slow cooling pit; protective steel plates, which are arranged between adjacent anti-collision piles; anti-collision beams at the top of the pit, which are arranged to the top of the pit wall; and side wall guard plates, which are arranged on the outer wall of the slow cooling pit and extend downward from the top of the pit wall to form impact protection for the outer wall. The pit wall of the slow cooling pit is a multi-layer composite structure, the outer layer is reinforced concrete, the middle layer is provided with insulation material as an insulation layer, the inner layer is anti-collision piles and protective steel plates, the bottom base of the pit is reinforced concrete, the bottom of the pit is equipped with footings, there are drainage ditches around, and there are water wells outside. The present invention can provide protection for various vulnerable parts of the slow cooling pit to the greatest extent by providing a protective structure for the inner wall, outer wall and top of the pit wall of the slow cooling pit, which not only improves the impact resistance of the slow cooling pit, but also prolongs the service life of the slow cooling pit, and is easy for local maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of slow cooling devices for metallurgical continuous casting steel products, and more specifically, to a slow cooling pit in a metallurgical continuous casting workshop. Background Art

[0002] If the amount of hydrogen in the chemical composition of steel is too high, white spot defects will appear in the steel products. If steel with white spot defects is used for parts processing, the white spot defects will interfere with normal operation during the processing, causing the semi-finished products to be scrapped. If there are white spot defects in steel products, even if the processing is completed smoothly, the finished products will be affected by the white spot defects in their structure and organization, shortening the reliability and life of the parts, and in severe cases, causing serious safety accidents such as vehicle destruction and death.

[0003] Therefore, reducing the hydrogen content in steel and eliminating or reducing white spot defects have always been issues that cannot be ignored in steel production. The slow cooling pit is used to slowly cool the rolled steel at high temperature, so that the hydrogen in the steel can diffuse and overflow rapidly at high temperature, thereby achieving the purpose of reducing the hydrogen content in the steel. For this reason, the slow cooling pit has also become an indispensable and important equipment in steel production.

[0004] In the prior art, a hot steel billet insulation pit is provided, which includes a pit body and an insulation cover. The pit body is composed of a concrete layer and an insulation layer. The side walls and end walls of the pit body are provided with anti-collision rails. The bottom of the pit body is provided with a square frame. The insulation cover includes an insulation cover body and an electric single beam installed on both sides of the insulation cover body. The insulation cover body structure includes an I-beam, a channel steel and a steel plate, and is welded by the above components. The insulation cover body is lined with an insulation material layer, and the insulation cover is installed on the side wall slide of the electric single beam through rollers. There is no protective wall in the insulation layer in the above-mentioned hot steel billet insulation pit. When the billet enters the pit, it hits the insulation layer, which is easy to cause damage to the insulation layer. Once the insulation layer is hit and falls off, the concrete base of the insulation pit will soon be damaged and burned. The insulation pit can no longer provide insulation function until the concrete exposed reinforcement is damaged. Summary of the invention

[0005] In summary, how to provide an impact-resistant slow cooling pit to increase its service life has become an urgent problem to be solved by those skilled in the art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a slow cooling pit in a metallurgical continuous casting workshop. In the present invention, the slow cooling pit in the metallurgical continuous casting workshop comprises a slow cooling pit body, the slow cooling pit body comprises a pit wall and a pit bottom, the pit wall comprises an inner side wall, an outer side wall and a pit wall top, and the slow cooling pit body is provided with:

[0008] Anti-collision piles, the anti-collision piles are arranged on the inner side wall, the anti-collision piles are arranged vertically, a plurality of the anti-collision piles are arranged, and adjacent anti-collision piles are arranged at intervals;

[0009] A protective steel plate, the protective steel plate is arranged between two adjacent anti-collision piles and cooperates with the anti-collision piles to form impact protection for the inner side wall;

[0010] A pit top anti-collision beam, wherein the pit top anti-collision beam is arranged at the top of the pit wall to form an impact protection for the top of the pit wall;

[0011] A side wall guard plate, the side wall guard plate is arranged on the outer side wall and extends downward from the top of the pit wall to form impact protection for the outer side wall;

[0012] A heat-insulating layer is sandwiched between the protective steel plate and the inner wall.

[0013] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, the anti-collision pile is arranged on the inner wall through an installation component, and the installation component includes: a pit wall embedded part, the pit wall embedded part is used to be embedded in the pit wall, the pit wall embedded part has a welding surface, and the welding surface is exposed relative to the inner wall; an anti-collision pile connecting plate, the anti-collision pile connecting plate is located inside the slow cooling pit body relative to the inner wall and is welded to the welding surface, and the anti-collision pile is fixedly arranged on the anti-collision pile connecting plate.

[0014] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, the anti-collision pile is fixed on the anti-collision pile connecting plate by welding.

[0015] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, a clamping plate is fixedly provided on the anti-collision pile connecting plate, and an installation gap is formed between adjacent clamping plates. The protective steel plate is arranged in the installation gap and clamped between the clamping plates.

[0016] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, the clamping plate and the anti-collision pile connecting plate are welded together.

[0017] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, the retaining plates are symmetrically arranged in the horizontal direction relative to the anti-collision piles, and a plurality of groups of the retaining plates arranged in pairs are arranged at intervals along the length direction of the anti-collision piles.

[0018] Preferably, the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention also includes an elastic connecting member, which includes an embedded bolt for pre-embedded in the pit wall, a spring for sleeved on the embedded bolt, a pad against the spring, and a tightening nut for pressing the pad in cooperation with the thread of the embedded bolt; the embedded bolt includes an embedded section for pre-embedded in the pit wall and a mounting section protruding relative to the pit wall, the spring, the pad and the tightening nut are assembled on the mounting section; the pit top anti-collision beam and the side wall guard plate are installed on the pit wall of the slow cooling pit through the elastic connecting member.

[0019] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, an installation sink is provided on the anti-collision beam at the top of the pit, and the anti-collision beam at the top of the pit is installed on the elastic connecting piece through the installation sink.

[0020] Preferably, the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention also includes a support plate, which is fixedly connected to the inner wall, and a plurality of the support plates are arranged at intervals in the horizontal direction to form a support plate group, and a plurality of the support plate groups are arranged at intervals in the vertical direction, and the insulation layer is mounted between the support plates, and the installation of the insulation layer on the inner wall of the slow cooling pit is reinforced by the support plates.

[0021] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, a side wall anti-collision guide plate is arranged on the inner wall and close to the top of the pit wall, and the side wall anti-collision guide plate is used to guide the slow cooling material entering the pit, and the side wall anti-collision guide plate is fixedly arranged on the protective steel plate.

[0022] Preferably, the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention further includes code feet, wherein the code feet are arranged on the bottom of the pit, a plurality of code feet are arranged, adjacent code feet are arranged at intervals, and insulation material is arranged in the gap between two adjacent code feet.

[0023] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, in the height direction, the top surface of the code foot is higher than the top surface of the thermal insulation material.

[0024] Preferably, the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention further includes a water pumping well, which is arranged outside the slow cooling pit body, and the depth of the water pumping well is greater than the depth of the slow cooling pit body.

[0025] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, a water pump is arranged in the water drawing well.

[0026] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, a liquid level controller connected to the control of the water pump is also arranged in the water well.

[0027] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, the pit bottom is an inclined structure, the slope range of the pit bottom is: 1:18-1:22, and the water well is arranged on one side of the bottom end of the pit bottom.

[0028] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, a water accumulation ditch is provided at the bottom of the pit, and the water accumulation ditch is connected to the water drawing well.

[0029] Preferably, in the slow cooling pit of the metallurgical continuous casting workshop provided by the present invention, the water accumulation ditch is located at the bottom of the pit close to its edge.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a slow cooling pit in a metallurgical continuous casting workshop, comprising a slow cooling pit main body, on which are arranged: anti-collision piles, which are arranged on the inner wall of the slow cooling pit, and are vertically arranged. There are multiple anti-collision piles, and adjacent anti-collision piles are arranged at intervals; protective steel plates, which are arranged between two adjacent anti-collision piles and cooperate with the anti-collision piles to form impact protection against the inner wall; pit top anti-collision beams, which are arranged at the top of the pit wall to form impact protection against the top of the pit wall; side wall guard plates, which are arranged on the outer wall of the slow cooling pit and extend downward from the top of the pit wall to form impact protection against the outer wall. In the present invention, the pit wall of the slow cooling pit is a multi-layer composite structure, the outer layer is reinforced concrete, the middle layer is provided with insulation material as an insulation layer, the inner layer is anti-collision piles and protective steel plates, the bottom base of the pit is reinforced concrete, the bottom of the pit is equipped with footings, there are drainage ditches around, and there are water wells outside. The bottom of the drainage ditch is an inclined surface (slope) structure for easy drainage, and the protective steel plate is installed with a card plate. When the protective steel plate is heated, it can be retracted after thermal expansion. The top anti-collision beam of the pit is elastically installed by embedded bolts and springs and other components. The spring can play a buffering role and can fine-tune the amount of thermal deformation. It can be restored during cooling and will not be torn due to thermal expansion. The pit depth of the slow cooling pit of the present invention is 2 / 3 below the ground surface and 1 / 3 above the ground. The space on the factory floor is small, and the lifting of the steel billet is easy to operate. The inner protective steel plate is 12-16mm steel plate. If it is too thick, the thermal deformation will be large, the installation will be difficult and the cost will be high. If it is too thin, it will not withstand the impact of the steel billet lifting process. The protective steel plate is installed with a clamping plate, and the lower part of the anti-collision pile is welded with an anti-collision pile connecting plate, and the installation accuracy and connection method can be controlled during installation. Considering that the groundwater level in the use area is high in summer, a ditch and a water well are provided under the slow cooling pit, so that the accumulated water in the pit can be pumped into the well and then discharged to the outside, so as to avoid the failure of the slow cooling pit caused by the accumulation of water in the slow cooling pit. The present invention can provide protection for the various vulnerable parts of the slow cooling pit to the greatest extent by providing a protective structure for the inner wall, outer wall and top of the pit wall of the slow cooling pit, which not only improves the impact resistance of the slow cooling pit, but also prolongs the service life of the slow cooling pit and is easy for local maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0033] Figure 1 This is a schematic diagram of the structure of the slow cooling pit in an embodiment of the present invention;

[0034] Figure 2 A top view of a slow cooling pit in an embodiment of the present invention;

[0035] Figure 3 A cross-sectional view of a pit wall of a slow cooling pit in an embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of the partial structure of the pit wall of the slow cooling pit in the embodiment of the present invention from a cross-sectional perspective;

[0037] Figure 5 It is a schematic diagram of the structure of the elastic connecting member in an embodiment of the present invention;

[0038] Figure 6 for Figure 1 An enlarged schematic diagram of the structure at the middle box a;

[0039] Figures 1 to 6 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0040] Anti-collision piles 1, protective steel plates 2, anti-collision beams on the top of the pit 3, side wall guard plates 4, embedded parts of the pit wall 5, anti-collision pile connecting plates 6, clamping plates 7, embedded bolts 8, springs 9, pads 10, tightening nuts 11, insulation layers 12, side wall anti-collision guide plates 13, code feet 14, water wells 15, water pumps 16, liquid level controllers 17, pit bottom 18, transition beams 19, brackets 20, and brackets 21. DETAILED DESCRIPTION

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0042] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] Please refer to Figures 1 to 6 ,in, Figure 1 This is a schematic diagram of the structure of the slow cooling pit in an embodiment of the present invention; Figure 2 A top view of a slow cooling pit in an embodiment of the present invention; Figure 3A cross-sectional view of a pit wall of a slow cooling pit in an embodiment of the present invention; Figure 4 It is a schematic diagram of the partial structure of the pit wall of the slow cooling pit in the embodiment of the present invention from a cross-sectional perspective; Figure 5 It is a schematic diagram of the structure of the elastic connecting member in an embodiment of the present invention; Figure 6 for Figure 1 An enlarged schematic diagram of the structure at box a.

[0044] The invention discloses a slow cooling pit of a metallurgical continuous casting workshop, which comprises a slow cooling pit body. The slow cooling pit body adopts a rectangular pit structure, which comprises a pit wall and a pit bottom. The pit wall has an inner wall, an outer wall and a pit wall top.

[0045] The present invention installs the following protective device on the slow cooling pit in the metallurgical continuous casting workshop:

[0046] 1. Anti-collision pile 1

[0047] The anti-collision pile 1 is made of metal material, such as steel profile (strip steel or I-beam), and the anti-collision pile 1 is fixed relative to the inner wall of the slow cooling pit to increase the impact resistance of the inner wall.

[0048] Generally, the main body of the slow cooling pit adopts a rectangular pit structure. Among the four pit walls that constitute the main body of the slow cooling pit, the inner wall of the pit wall is a vertically arranged wall structure.

[0049] Specifically, the anti-collision pile 1 is arranged on the inner wall of the slow cooling pit, and the anti-collision pile 1 is arranged vertically on the inner wall of the slow cooling pit.

[0050] The anti-collision pile 1 is a long strip structure, and the cross-sectional shape of the anti-collision pile 1 can be rectangular, circular, elliptical or I-shaped, with the I-shaped being the optimal cross-sectional shape. When the anti-collision pile 1 is vertically set, the width of the anti-collision pile 1 is small. Therefore, in order to provide sufficient impact protection for the inner wall of the slow cooling pit, the present invention sets a plurality of anti-collision piles 1 on the inner wall, and adjacent anti-collision piles 1 are set at intervals.

[0051] As a preferred embodiment of the present invention, the intervals between the anti-collision piles 1 range from 1.0 m to 1.5 m, with 1.0 m being the optimal interval.

[0052] 2. Protective steel plate 2

[0053] The protective steel plate 2 is an anti-collision metal plate (steel plate) arranged in the slow cooling pit and close to the inner wall of the slow cooling pit.

[0054] The protection steel plate 2 is arranged close to the inner wall of the slow cooling pit specifically means that the protection steel plate 2 is arranged at a distance from the inner wall of the slow cooling pit, and the insulation layer is arranged in the distance.

[0055] The protective steel plate 2 is cut from a whole piece of metal plate, and is designed according to the shape of its installation position, and is installed between the anti-collision piles 1 in a clamping manner. Specifically, the protective steel plate 2 is arranged between two adjacent anti-collision piles 1 and cooperates with the anti-collision piles 1 to form impact protection for the inner wall.

[0056] The protective steel plate 2 and the anti-collision pile 1 are both arranged on the inner wall of the slow cooling pit, and work together to provide impact protection for the inner wall of the slow cooling pit.

[0057] 3. Anti-collision beam at the top of the pit 3

[0058] For the slow cooling pit, during the process of hoisting the slow cooling materials into the slow cooling pit, the slow cooling materials entering the pit are very likely to hit the top of the pit wall and the inner wall of the slow cooling pit. The above-mentioned anti-collision piles 1 and protective steel plates 2 can play an impact protection role on the inner wall of the slow cooling pit. In order to protect the top of the pit wall of the slow cooling pit, the present invention also provides a pit top anti-collision beam 3. The pit top anti-collision beam 3 is set to the top of the pit wall of the slow cooling pit to form an impact protection for the top of the pit wall.

[0059] Specifically, the pit top anti-collision beam 3 is made of metal material, such as square steel pipe. Furthermore, the length and width dimensions of the pit top anti-collision beam 3 are designed with reference to the top dimensions of the pit wall of the slow cooling pit, so as to be able to completely cover the top of the pit wall.

[0060] 4. Side wall guard plate 4

[0061] The slow cooling pit generally adopts a structural design that is sunk below the ground surface, that is, the lower two-thirds of the slow cooling pit in the height direction is located below the ground surface. Especially in winter, the overall thermal insulation effect of the slow cooling pit is better, and it is easy to observe the condition of the billets in the pit, which is convenient for safe ground operations to lift the billets in the pit. Its upper one-third is located above the ground surface. Then, when the slow cooling materials entering the pit are hoisted, they are also easy to hit the outer surface of the pit wall of the slow cooling pit. In order to protect the outer side of the pit wall of the slow cooling pit, the present invention provides a side wall guard plate 4. Specifically, the side wall guard plate 4 is arranged on the outer wall of the slow cooling pit and extends downward from the top of the slow cooling pit to form impact protection for the outer wall. Preferably, the extension length of the side wall guard plate 4 is between 500mm-700mm, with 700mm being the optimal size.

[0062] 5. Install components

[0063] The installation component is a component for realizing the installation of the anti-collision pile 1 in the present invention, and the anti-collision pile 1 is arranged on the inner wall of the slow cooling pit through the installation component.

[0064] Specifically, the installation components include:

[0065] 5a. Pit wall embedded parts 5. The pit wall embedded parts 5 are embedded in the pit wall of the slow cooling pit. In this way, the strength of the pit wall embedded parts 5 set on the pit wall of the slow cooling pit is higher.

[0066] The pit wall embedded part 5 is used to be embedded in the side wall of the slow cooling pit. The pit wall embedded part 5 has a welding surface, which is a plane with a larger area on the pit wall embedded part 5. By designing the embedded depth of the pit wall embedded part 5 in the pit wall, the welding surface can be exposed relative to the inner wall of the slow cooling pit to realize the welding of the anti-collision pile connecting plate 6 described below.

[0067] 5b. The anti-collision pile connecting plate 6 is located inside the slow cooling pit and welded to the welding surface. The anti-collision pile 1 is fixedly arranged on the anti-collision pile connecting plate 6.

[0068] The anti-collision pile connecting plate 6 adopts a U-shaped or groove-shaped structure. The anti-collision pile connecting plate 6 is formed in one piece with steel material, or is formed by bending steel plate. The closed end of the anti-collision pile connecting plate 6 is welded to the welding surface of the pit wall embedded part 5, and the open end of the anti-collision pile connecting plate 6 is used to assemble the anti-collision pile 1.

[0069] Specifically, the anti-collision pile 1 is fixed on the anti-collision pile connecting plate 6 by welding.

[0070] 6. Pallet 7

[0071] The clamping plate 7 is an important component for installing the protective steel plate 2 .

[0072] The card plate 7 is fixed to the anti-collision pile connecting plate 6, and the assembly structure of the card plate 7 inside the slow cooling pit is as follows: an installation gap is formed between adjacent card plates 7 (adjacent card plates 7 refer to those adjacent in the horizontal direction and the vertical direction), and the protective steel plate 2 is arranged in the installation gap and clamped between the card plates 7. The protective steel plate 2 is installed between the card plates 7 by clamping, and there is a movable connection structure between the protective steel plate 2 and the card plate 7. In this way, when the protective steel plate 2 expands and deforms due to heat, the movable connection structure between the protective steel plate 2 and the card plate 7 can allow the protective steel plate 2 to have a larger deformation amount under the premise of ensuring that the protective steel plate 2 is stably installed on the inner wall of the slow cooling pit.

[0073] Specifically, the clamping plate 7 is welded to the anti-collision pile connecting plate 6. Of course, the clamping plate 7 and the anti-collision pile connecting plate 6 can also be connected by bolts.

[0074] Furthermore, the card plates 7 are symmetrically arranged in the horizontal direction relative to the anti-collision pile 1, and multiple groups of card plates 7 are arranged in pairs at intervals along the length direction of the anti-collision pile 1. The more card plates 7 are arranged, the stronger the stability of the card plates 7 in clamping the protective steel plates 2 is.

[0075] 7. Elastic connector

[0076] The elastic connector is an installation device used to realize the installation of the pit top anti-collision beam 3 and the side wall guard plate 4 on the slow cooling pit.

[0077] The pit top anti-collision beam 3 and the side wall guard plate 4 are installed on the part of the pit wall of the slow cooling pit that is above the ground surface. If the slow cooling material entering the pit hits the pit top anti-collision beam 3 or the side wall guard plate 4, it will cause a very large impact on the pit top anti-collision beam 3 and the side wall guard plate 4. If the pit top anti-collision beam 3 and the side wall guard plate 4 are installed on the pit wall of the slow cooling pit by rigid connection (for example, bolts or anchors are used to fix them to the pit wall of the slow cooling pit), the impact of the slow cooling material entering the pit will cause damage to the connection parts. In order to solve this problem, the present invention provides an elastic connector, which realizes the elastic installation of the pit top anti-collision beam 3 and the side wall guard plate 4 on the slow cooling pit through the elastic connector, and the impact is buffered by the elastic connector.

[0078] Specifically, the elastic connector includes an embedded bolt 8 for embedding in the pit wall of the slow cooling pit, a spring 9 for sleeved on the embedded bolt 8, a pad 10 abutting against the spring 9, and a tightening nut 11 threadedly matched with the embedded bolt 8 for pressing the pad 10. The embedded bolt 8 includes an embedded section for embedding in the pit wall of the slow cooling pit and a mounting section protruding relative to the pit wall of the slow cooling pit. The embedded bolt 8 is made of metal material and adopts an integrated structure, which can ensure that the embedded bolt 8 has a high structural strength. The spring 9, the pad 10 and the tightening nut 11 are assembled on the mounting section, and the pit top anti-collision beam 3 and the side wall guard plate 4 are installed on the pit wall of the slow cooling pit through the elastic connector.

[0079] The anti-collision beam 3 at the top of the pit is installed on the slow-cooling pit through an elastic connector. In order to prevent the slow-cooling material entering the pit from colliding with the elastic connector, the present invention optimizes the structure of the anti-collision beam 3 at the top of the pit: an installation groove is provided on the anti-collision beam 3 at the top of the pit, and the anti-collision beam 3 at the top of the pit is installed on the elastic connector through the installation groove. After the elastic connector is tightened, the elastic connector is completely sunk into the installation groove.

[0080] 8. Insulation layer 12

[0081] The insulation layer 12 is the main component for achieving the insulation of the slow cooling pit, and the insulation layer 12 is arranged between the protective steel plate 2 and the inner wall of the slow cooling pit. In the present invention, the insulation layer 12 is made of insulation composite material, for example, insulation bricks are used to construct the main structure of the insulation layer, and insulation cotton and quartz sand are used to fill the gaps.

[0082] The insulation layer 12 is arranged between the protective steel plate 2 and the inner wall of the slow cooling pit. If the slow cooling material entering the pit impacts the protective steel plate 2, the impact force will be transmitted to the insulation layer 12, which may easily cause the insulation layer 12 to fall off. Therefore, the present invention also provides a support plate, through which the insulation layer 12 is reinforced.

[0083] The pallet is connected to the inner wall support of the slow cooling pit. Multiple pallets are arranged at intervals in the horizontal direction to form a pallet group. The pallet group is provided with multiple pallet groups, and multiple pallet groups are arranged at intervals in the vertical direction. The insulation layer 12 is assembled between the pallets, and the installation of the insulation layer 12 on the inner wall of the slow cooling pit is reinforced by the pallets.

[0084] Specifically, the support plate is made of metal material and adopts a straight-line structure design. The support plate is placed on the inner wall of the slow cooling pit and the side of the anti-collision pile through four supports, which increases the strength of the protective plate and facilitates local maintenance of the insulation layer 12.

[0085] 9. Side wall anti-collision guide plate 13

[0086] A side wall anti-collision guide plate 13 is provided on the inner side wall of the slow cooling pit and near the top of the pit wall of the slow cooling pit, and is used to guide the materials entering the pit. The side wall anti-collision guide plate 13 is fixedly provided on the protective steel plate 2. The side wall anti-collision guide plate 13 is integrally formed of metal material, and the side wall anti-collision guide plate 13 adopts a structure design with a trapezoidal cross section. The large bottom side of the side wall anti-collision guide plate 13 is provided on the protective steel plate 2, and the small bottom side of the side wall anti-collision guide plate 13 is provided toward the inner side of the slow cooling pit. In this way, a guiding structure is formed by the side wall anti-collision guide plate 13 at a position near the top of the inner side wall of the slow cooling pit, which is used to guide the slow cooling materials entering the pit into the slow cooling pit, and avoid the slow cooling materials entering the pit from hitting the inner side wall of the slow cooling pit multiple times.

[0087] The cross section of the side wall anti-collision guide plate 13 is a trapezoid, and the trapezoid has an upper bottom, a lower bottom and two waists. Figure 6 As described above, in the vertical direction, the upper and lower sides of the side wall anti-collision guide plate 13 are trapezoidal waists, the left side is the lower bottom of the trapezoid, that is, the large bottom, and the right side is the upper bottom of the trapezoid, that is, the small bottom.

[0088] 10. Code foot 14

[0089] The foot 14 is arranged on the pit bottom 18 inside the slow cooling pit, and is used to support the slow cooling material placed in the slow cooling pit.

[0090] The foot 14 is made of metal material, which can be a customized part or made from local materials, that is, a steel material of a casting suitable for the size of the slow cooling pit. A plurality of foot 14 are provided, and adjacent foot 14 are arranged at intervals. Insulating materials are provided in the gap between two adjacent foot 14, and insulating materials are provided at the pit bottom 18, which can improve the insulation effect of the slow cooling pit.

[0091] Furthermore, in the height direction, the top surface of the foot 14 is higher than the top surface of the insulation material. The foot 14 supports the slow cooling material in the pit to prevent the slow cooling material from directly pressing on the insulation material. This structural optimization can protect the insulation material.

[0092] 11. Water well 15

[0093] The water well 15 is used to collect the accumulated water in the slow cooling pit due to the high groundwater level that seeps into the base slab of the slow cooling pit. Specifically, the water well 15 is arranged outside the slow cooling pit, and the depth of the water well 15 is greater than the depth of the slow cooling pit, so as to avoid the backflow of the accumulated water.

[0094] Specifically, the present invention further provides a water pump 16 in the water well 15 , and further provides a liquid level controller 17 in control connection with the water pump 16 in the water well 15 .

[0095] The above components can form a complete slow cooling pit protection system. Based on the above-mentioned slow cooling pit of the metallurgical continuous casting workshop, the present invention also provides a slow cooling pit, including a pit wall and a pit bottom 18, the pit wall includes an inner wall, an outer wall, the pit bottom 18 and the top of the pit wall. Specifically, the anti-collision pile 1 and the protective steel plate 2 of the slow cooling pit of the metallurgical continuous casting workshop are arranged on the inner wall, the anti-collision beam 3 at the top of the pit is arranged on the top of the pit wall, and the side wall guard plate 4 is arranged on the outer wall.

[0096] The slow cooling pit is sunk below the ground surface, and groundwater reverse seepage is prone to accumulate at its bottom. In order to discharge the seepage water out of the slow cooling pit in time, the present invention proposes the following optimized design: the pit bottom 18 is an inclined structure, and the slope range of the pit bottom 18 is: 1:18-1:22, with 1:20 as the best slope.

[0097] The slow cooling pit of the metallurgical continuous casting workshop includes a water well 15, which is arranged outside the slow cooling pit and located at one side of the bottom end of the pit bottom 18. Specifically, a water ditch is arranged at the pit bottom 18, the water ditch is connected to the water well 15, and the water ditch is located at a position of the pit bottom 18 near its edge.

[0098] The slow cooling pit protection device provided by the present invention is a device for protecting the slow cooling pit in the metallurgical billet or material workshop. The slow cooling pit adopts a rectangular pit body structure, and its pit wall is a reinforced concrete structure. The upper and lower 2 / 3 of the height of the slow cooling pit is sunk below the ground, and 1 / 3 of the height is above the ground. The pit wall part above the ground (i.e., the top of the outer layer of the pit wall) is provided with a 500-700mm side wall guard plate (steel plate), and the side wall guard plate is fixed and installed with embedded bolts 8. Springs 9 are added to the embedded bolts 8 and fixed with pads 10, which can buffer thermal expansion deformation and make the screws not easy to loosen, and at the same time can also improve the impact resistance of the connection structure. The inner layer of the pit wall (the inner wall of the slow cooling pit) adopts a protective steel plate 2, that is, a self-protective steel plate 2 is provided, and an insulation layer 12 is provided between the protective steel plate 2 and the inner wall. The insulation layer 12 is constructed with insulation bricks to construct the main structure, and the gaps are filled with insulation cotton and quartz sand. Longitudinal anti-collision piles 1 are arranged at intervals of 1-1.5 meters on the inner wall of the slow cooling pit, and support plates are added horizontally to prevent the overall collapse of the insulation layer (insulation bricks or insulation cotton).

[0099] The anti-collision pile 1 is fixed in the slow cooling pit in the following manner: a pit wall embedded part 5 is set on the pit wall and an I-beam (transition beam 19) is welded, and then an anti-collision pile connecting plate 6 is welded on the I-beam (transition beam 19). The anti-collision pile connecting plate 6 is a U-shaped structure (the anti-collision pile connecting plate 6 can be made of channel steel), which is stuck in the pit wall of the slow cooling pit. The anti-collision pile connecting plate 6 and the anti-collision pile 1 are welded at the bottom, and a clamping plate 7 is also welded on the anti-collision pile connecting plate 6. Specifically, the clamping plate 7 is welded on the two wing plates at the open end of the anti-collision pile connecting plate 6, and the protective steel plate 2 is installed through the clamping plate 7.

[0100] The top of the slow cooling pit is equipped with embedded bolts 8, and the anti-collision beam 3 on the top of the pit is installed through the embedded bolts 8. After the anti-collision beam 3 and the protective steel plate 2 on the top of the pit are installed, they are installed on the side wall so that the blank or material can be guided into the pit, avoiding the problem of too many back and forth collisions of the slow cooling material entering the pit.

[0101] When installing the pit top anti-collision beam 3, after the pit top anti-collision beam 3 is in place, it is assembled to the embedded bolts 8 from its top and side, and then the spring 9, the pad 10 and the tightening nut 11 are assembled to achieve the fastening of the pit top anti-collision beam 3.

[0102] The screw holes on the anti-collision frame on the top of the pit are made into countersunk holes, which are convenient for screw installation and can protect the screws from direct contact with the steel billet and avoid impact damage.

[0103] A 500mm high side wall guard plate 4 is arranged outside the upper end of the side wall of the pit. The side wall guard plate 4 is welded with the parts arranged on the top of the pit wall to form an angle component. A drainage ditch is arranged around the bottom of the pit. The size of the drainage ditch is set according to the amount of local groundwater to meet the design standard of draining the accumulated water and keeping the pit dry. When the bottom of the pit is built, the bottom of the drainage ditch is designed as a slope structure. The slope generally adopts a slope of 1:20. There are footers 14 at the bottom of the pit. The footers 14 are made of steel billets obtained locally. Generally, rectangular billets of about 250-400mm are preferably used. The spacing between the rectangular billets is about 2 meters. Insulation bricks are used to pave the gap between the footers 14. The footers 14 are about 50mm higher than the height of the insulation material. In this way, the billets and materials stored between the footers 14 are heated more evenly and the insulation material is protected from damage.

[0104] Drainage ditches are arranged around the bottom of the slow cooling pit. The bottom of the ditch is a slope structure. The water well is a downslope surface. A water well 15 is arranged outside the pit. The accumulated water in the drainage ditch needs to be drained into the water well 15. The water well 15 uses a pump 16 to pump out the water.

[0105] A support plate is fixedly installed relative to the pit wall base of the slow cooling pit. The support plate is a horizontally arranged plate structure. The support plate is provided with multiple support plates spaced apart in the vertical direction. The support plate is arranged between the insulation layers 12 to provide anti-collapse support for the insulation layers 12.

[0106] The present invention also provides a card plate 7, which is an L-shaped structure. One end of the card plate 7 (one arm) is fixed relative to the anti-collision pile 1, and the other end of the card plate 7 (the other arm) is spaced apart from the insulation layer 12 to form a card-mounting space, and the protective steel plate 2 is card-mounted in the card-mounting space.

[0107] In the present invention, anti-collision piles 1 and protective steel plates 2 are arranged in the slow cooling pit, a foot 14 is arranged in the slow cooling pit, and drainage ditches are arranged around the bottom of the pit. A water well 15 is arranged outside the slow cooling pit. The bottom of the drainage ditch around the bottom of the slow cooling pit is a slope surface structure, which is convenient for drainage. The protective steel plate 2 adopts a clamping plate 7 for active connection. When the protective steel plate 2 is heated and expanded, there is a slight expansion and contraction deformation. The above-mentioned active connection can ensure that the flat steel plate is deformed freely due to heat without tearing the weld. A pit top anti-collision beam 3 is arranged at the top of the slow cooling pit. The pit top anti-collision beam 3 is pre-embedded with bolts 8 and springs 9 for installation and fixing. It can play a role in buffering and adjusting the amount of heat deformation. After the protective steel plate 2 is cooled, it can automatically recover and will not be torn due to heat deformation constraints. Because the groundwater level is high in the summer in the use area, a drainage ditch is arranged under the slow cooling pit. The water well 15 can pump the accumulated water in the slow cooling pit into the well and then discharge it outside, so as to avoid the slow cooling pit water accumulation causing the slow cooling pit insulation function to fail.

[0108] The slow cooling pit provided by the present invention has a pit wall of a composite structure, with a base layer of reinforced concrete, an intermediate layer of thermal insulation bricks or thermal insulation cotton, and an outer layer of a protective steel plate 2. Anti-collision piles 1 are arranged at intervals, protective steel plates 2 are arranged between the anti-collision piles 1, a pit top anti-collision beam 3 is arranged on the top layer of the slow cooling pit, and a side wall guard plate 4 (steel plate) is arranged on the top outer wall of the pit wall. In terms of the connection method, the pit wall embedded parts 5 set on the pit wall base are plugged with hooks, and the pit wall embedded parts 5 are welded to the transition beam 19, and the bottom is welded solid. The anti-collision pile connecting plate 6 is welded through the transition beam 19, and the anti-collision pile 1 is welded in the groove of the anti-collision pile connecting plate 6. The side is equipped with a clamping plate 7, and the anti-collision rail and the channel steel (anti-collision pile connecting plate 6) are welded solid at the bottom. The clamping plate 7 is fixed on the sides of the groove of the anti-collision pile connecting plate 6 by welding. During actual construction, the clamping plate 7 should be welded and fixed first, and then the protective steel plate 2 should be installed on the clamping plate 7 from top to bottom. The clamping plate 7 is angular or L-shaped, and the clamping plate 7 is welded on one side of the anti-collision pile connecting plate 6. There is a 5-15mm gap between the other side of the clamping plate 7 and the protective steel plate 2, which is convenient for the protective steel plate 2 to be inserted into the clamping plate 7 from top to bottom during installation.

[0109] Specifically, the slow cooling pit provided by the present invention is implemented as follows: steel embedded parts are made at a spacing of 1.2-1.5 meters on the inner wall of the slow cooling pit. The panel of the steel embedded part is plug-welded to one end of the steel bar by drilling, and the other end is made into a circular shape with the steel bar in the concrete. The size of the steel embedded part is 300-400mm, and the thickness is 14-16mm. Sufficient strength is guaranteed during plug welding. The anti-collision pile 1 is connected to the anti-collision pile connecting plate 6 (channel steel) and the embedded steel plate by real welding, and a double fixing method is adopted with the clamping plate 7. After the welding is removed after thermal deformation, the clamping plate 7 is still fixed to have a double insurance function. The insulation layer 12 of the slow cooling pit is constructed with insulation bricks as the main structure, and insulation cotton and quartz sand are used to fill the gap to ensure a close connection with the anti-collision pile 1, and a support plate is welded on the side of the transition beam 19, and the insulation bricks are layered for easy installation and later maintenance. In the present invention, the installation dimensions and material properties are taken into consideration between the components, and the transition beam 19 is made of I-beam, and the anti-collision pile connecting plate 6 is welded on the transition beam 19. The I-beam has good welding performance. Then, the anti-collision pile 1 is welded on the anti-collision pile connecting plate 6. The anti-collision pile 1 is made of a steel rail structure, which has good wear resistance and small deformation.

[0110] The transition beam 19 is a channel steel, and an angled card plate 7 is welded on its side. One end is fixedly welded, and the other end is movably connected, so that the protective steel plate 2 set in the slow cooling pit will not be unwelded due to heat deformation. The anti-collision piles 1 are set at a distance of 1.2-1.4 meters, which can increase the strength of the anti-collision piles 1 to withstand impact in the pit. The lower part is welded with a support plate from the embedded part of the pit wall to lift the anti-collision piles 1 for easy installation.

[0111] A pit top anti-collision beam 3 is added to the top of the pit wall. The pit top anti-collision beam 3 is connected to the pit top with an elastic connector. The embedded bolts 8 are embedded in the top of the pit wall. Springs 9 are arranged on the embedded bolts 8 and pressure pads 10 are installed. For the pit top anti-collision beam 3, pit top anti-collision beam end plates are arranged on its two end faces. The end of the pit top anti-collision beam 3 is an angular structure. The pit top anti-collision beam end plate is also connected to the top (side) of the pit wall with an elastic connector. The pit top anti-collision beam 3 and the pit top anti-collision beam end plate are both connected to the top of the pit wall with an elastic connector. There is a certain deformable gap between the pit top anti-collision beam 3 and the inner side surface of the pit top anti-collision beam end plate and the outer side of the pit wall top. There are spring 9 pressure pads both upward and outward due to thermal deformation, which can buffer the deformation and damage of the steel beam caused by thermal deformation, and can also withstand the impact of the steel billet entering the pit.

[0112] The top structure of the pit wall is a concrete structure. Since the top of the slow cooling pit is easily damaged when the steel billet is hoisted, the present invention makes a steel structure frame on the top of the pit wall, namely, the anti-collision beam 3 on the top of the pit. The anti-collision beam 3 on the top of the pit is installed by embedded bolts 8 and springs 9 and other components, and its function is to buffer the impact force when the steel billet is hoisted. In addition, when the temperature inside the slow cooling pit rises, the anti-collision beam 3 on the top of the pit will also be deformed by heat. The spring 9 is used for installation to adapt to the deformation of the anti-collision beam 3 on the top of the pit. The present invention forms a double-slope structure by setting a side wall anti-collision guide plate 13 at the entrance of the top of the pit wall, which can avoid the situation where the frame is pulled over when the steel billet is hoisted.

[0113] When the slow-cooling material enters the pit, a side wall anti-collision guide plate 13 is set to prevent the steel billet from directly hitting the top beam and reduce damage to the main parts.

[0114] The bottom of the slow cooling pit is made of a flat surface made of concrete, and a drainage ditch is arranged at the bottom of the slow cooling pit. The bottom of the drainage ditch is a slope structure, and the bottom of the drainage ditch extends to a water well 15 to prevent water accumulation in the slow cooling pit when the seasonal groundwater level is high. Drainage ditches are made around the bottom of the pit, and a water well 15 is arranged outside the pit to introduce the water accumulated in the pit into the water well 15. The water well 15 uses a float to automatically pump water according to the water level.

[0115] The pit bottom 18 is supplemented with steel billet feet 14 on the concrete base, and the feet 14 are filled with insulation bricks around to ensure that the slow cooling pit meets the production process requirements.

[0116] The innovation of the present invention is that the pit wall of the slow cooling pit is a multi-layer composite, the outer layer is reinforced concrete, the middle layer is provided with thermal insulation materials, the inner layer is anti-collision piles 1 and protective steel plates 2, the bottom base of the pit is reinforced concrete, and there are footings 14 on it, drainage ditches around it, and a water well 15 outside. The bottom surface of the bottom drainage ditch is a slope surface for easy drainage. The protective steel plate 2 is installed with a card plate 7. When the protective steel plate 2 is heated, it can be retracted after thermal expansion. The top anti-collision beam 3 of the pit is elastically installed by embedded bolts 8 and springs 9 and other components. The spring 9 can play a buffering role and can fine-tune the amount of deformation due to heat. It can be restored during cooling and will not be torn due to thermal expansion. The pit depth of the slow cooling pit of the present invention is 2 / 3 below the ground surface and 1 / 3 above the ground, which is convenient for cranes to lift steel billets in the factory and easy for personnel to operate safely. The inner protective steel plate 2 is made of 12-16 mm steel plate. If it is too thick, it will have great thermal deformation, be difficult to install and have high cost. If it is too thin, it will not be able to withstand the impact of the billet lifting process. The protective steel plate 2 is installed using a clamping plate 7.

[0117] A bracket is welded at the bottom of the protective steel plate 2, and the installation accuracy and connection method can be controlled during installation. The bracket is set, and the support plate is fixed by two adjacent brackets at the same level. The insulation bricks are installed in layers by the bracket and the support plate, and they can be partially replaced when damaged.

[0118] Considering that the groundwater level in the area of ​​use is high in summer, a trench and a water well 15 are provided under the slow cooling pit, so that the accumulated water under the pit can be pumped into the well and then discharged to avoid the slow cooling pit from failing due to water accumulation in the slow cooling pit. The present invention can provide protection for each vulnerable part of the slow cooling pit to the greatest extent by providing a protective structure for the inner wall, outer wall and top of the pit wall of the slow cooling pit, which not only improves the impact resistance of the slow cooling pit, but also prolongs the service life of the slow cooling pit.

[0119] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A slow cooling pit in a metallurgical continuous casting workshop, comprising a slow cooling pit body, the slow cooling pit body comprising a pit wall and a pit bottom (18), the pit wall comprising an inner wall, an outer wall and a pit wall top, characterized in that: The slow cooling pit body is provided with: An anti-collision pile (1), the anti-collision pile being arranged on the inner side wall, the anti-collision pile being arranged vertically, a plurality of the anti-collision piles being arranged, and adjacent anti-collision piles being arranged at intervals; A protective steel plate (2), the protective steel plate being arranged between two adjacent anti-collision piles and cooperating with the anti-collision piles to form impact protection for the inner side wall; A pit top anti-collision beam (3), the pit top anti-collision beam being arranged at the top of the pit wall to form impact protection for the top of the pit wall; A side wall guard plate (4), the side wall guard plate being arranged on the outer side wall and extending downward from the top of the pit wall to form impact protection for the outer side wall; A thermal insulation layer (12), the thermal insulation layer being sandwiched between the protective steel plate and the inner side wall; It also includes a support plate, which is fixedly connected to the inner side wall, and a plurality of the support plates are arranged at intervals in the horizontal direction to form a support plate group, and a plurality of the support plate groups are arranged at intervals in the vertical direction, and the thermal insulation layer is mounted between the support plates, and the thermal insulation layer is installed and reinforced on the inner side wall of the slow cooling pit by the support plates; The anti-collision pile is arranged on the inner side wall through a mounting assembly, and the mounting assembly includes: A pit wall embedded component (5), the pit wall embedded component is used to be embedded in the pit wall, the pit wall embedded component has a welding surface, and the welding surface is exposed relative to the inner wall; an anti-collision pile connecting plate (6), the anti-collision pile connecting plate being located inside the slow cooling pit body relative to the inner side wall and being welded to the welding surface, the anti-collision pile being fixedly arranged on the anti-collision pile connecting plate; The anti-collision pile is fixedly arranged on the anti-collision pile connecting plate by welding; A clamping plate (7) is fixedly arranged on the anti-collision pile connecting plate, and an installation gap is formed between adjacent clamping plates. The protective steel plate is arranged in the installation gap and clamped between the clamping plates.

2. The slow cooling pit in a metallurgical continuous casting workshop according to claim 1, characterized in that: The clamping plate is welded to the anti-collision pile connecting plate; The clamping plates are symmetrically arranged in the horizontal direction relative to the anti-collision pile, and a plurality of groups of the clamping plates arranged in pairs are arranged at intervals along the length direction of the anti-collision pile.

3. The slow cooling pit for metallurgical continuous casting workshop according to claim 1, characterized in that: It also includes an elastic connecting member, the elastic connecting member including an embedded bolt (8) for being embedded in the pit wall, a spring (9) for being sleeved on the embedded bolt, a pad (10) abutting against the spring, and a tightening nut (11) that cooperates with the embedded bolt thread and is used to press the pad; The embedded bolt comprises an embedded section for embedding in the pit wall and a mounting section protruding relative to the pit wall, and the spring, the pad and the tightening nut are assembled on the mounting section; The pit top anti-collision beam and the side wall guard plate are installed on the pit wall of the slow cooling pit through the elastic connecting piece.

4. The slow cooling pit for metallurgical continuous casting workshop according to claim 3, characterized in that: An installation groove is provided on the pit top anti-collision beam, and the pit top anti-collision beam is installed on the elastic connecting piece through the installation groove.

5. The slow cooling pit for metallurgical continuous casting workshop according to claim 1, characterized in that: A side wall anti-collision guide plate (13) is arranged on the inner wall and close to the top of the pit wall. The side wall anti-collision guide plate is used to guide the slow-cooling material entering the pit. The side wall anti-collision guide plate is fixedly arranged on the protective steel plate.

6. The slow cooling pit for metallurgical continuous casting workshop according to any one of claims 1 to 5, characterized in that: It also includes code feet (14), which are arranged on the bottom of the pit. A plurality of code feet are provided, and adjacent code feet are arranged at intervals. A heat-insulating material is provided in the gap between two adjacent code feet.

7. The slow cooling pit in a metallurgical continuous casting workshop according to claim 6, characterized in that: In the height direction, the top surface of the code foot is higher than the top surface of the thermal insulation material.

8. The slow cooling pit in a metallurgical continuous casting workshop according to claim 6, characterized in that: It also includes a water-drawing well (15), which is arranged outside the slow cooling pit body, and the depth of the water-drawing well is greater than the depth of the slow cooling pit body.

9. The slow cooling pit in a metallurgical continuous casting workshop according to claim 8, characterized in that: A water pump (16) is arranged in the water well; A liquid level controller (17) connected to the water pump control is also provided in the water well.

10. The slow cooling pit in a metallurgical continuous casting workshop according to claim 8, characterized in that: The pit bottom is an inclined structure, and the slope range of the pit bottom is: 1:18-1:

22. The water well is arranged on one side of the bottom end of the pit bottom.

11. The slow cooling pit in a metallurgical continuous casting workshop according to claim 10, characterized in that: A water accumulation ditch is arranged at the bottom of the pit, and the water accumulation ditch is communicated with the water drawing well.

12. The slow cooling pit in a metallurgical continuous casting workshop according to claim 11, characterized in that: The water accumulation ditch is located at the bottom of the pit close to its edge.

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