CN218989346U - Cover type stepping trolley and top refractory arrangement structure thereof - Google Patents

Abstract

The utility model discloses a cover-type stepping trolley and a top refractory material arrangement structure thereof, wherein the refractory material arrangement structure comprises a heat insulation layer, an expansion sealing ring, a castable periphery, a lower layer supporting brick group, a castable inner structure, a peripheral refractory brick layer, an upper layer bearing brick group and a sealing sand layer, wherein the expansion sealing ring is fixedly arranged on the heat insulation layer, the castable periphery surrounds the periphery of the expansion sealing ring, the lower layer supporting brick group is built in the expansion sealing ring, the lower layer supporting brick group and the inner peripheral surface of the expansion sealing ring are provided with a gap, the castable inner structure comprises a main body part and a peripheral edge at the periphery of the bottom end of the main body part, the main body part coats the lower layer supporting brick group, the peripheral edge is filled at the inner lower end of the gap, a sand groove is formed at the upper end of the gap, the peripheral refractory brick layer is built at the upper part of the periphery of the castable, the upper layer bearing brick group is built on the lower layer supporting brick group, and the sealing sand layer is filled in the sand groove. According to the heat conduction and bearing part reasonable layout of the refractory material arrangement structure, the service life of the refractory material is prolonged.

Description

Cover type stepping trolley and top refractory arrangement structure thereof

Technical Field

The utility model belongs to the technical field of high-temperature annealing furnaces, and relates to silicon steel production equipment, in particular to a hood-type stepping trolley for a high-temperature annealing furnace and a refractory arrangement structure at the top of the trolley.

Background

When the oriented silicon steel is annealed in a step-by-step trolley hood type high-temperature furnace, a plurality of trolleys move in a furnace surrounded by a hearth in a step-by-step manner according to the process, the trolley and the refractory on the trolley serve as furnace bottom sealing effect, the temperature high-temperature section in the furnace can reach 1200 ℃, the requirement on the refractory on the trolley is high, and the trolley must structurally comprise: the heat insulation layer, the heat insulation layer and the bearing layer are mainly used for supporting steel coils on the trolley in the furnace, so that not only is enough bearing capacity ensured, but also heat energy conduction loss is reduced.

At present, aiming at the arrangement of refractory materials at the top of a high-temperature annealing furnace trolley, one method is to adopt full-fire-resistant standard bricks for construction, and the other method is to adopt the splicing construction of the lower oversized special bricks and leave expansion joints. The arrangement and the masonry mode are used for reserving expansion joints in masonry and buffering thermal expansion impact on one hand and for conveniently obtaining materials on the other hand. In the long-term use process, due to frequent loading and unloading of steel coils on the trolley, the refractory material is loosened, particularly the lower layer brick type masonry is poor in bearing capacity, and thus the continuous operation is required to be replaced completely for less than one year. When in maintenance, the whole masonry refractory is equivalent to re-masonry, which is long in time consumption and high in cost, and affects the operation and the productivity of the furnace.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model provides a stepped trolley top refractory material arrangement structure for a high-temperature annealing furnace, which solves the problems of frequent impact of steel coil loading and unloading, refractory material cracking at high temperature, large heat energy conduction loss, high maintenance rate and high cost.

In order to achieve the technical purpose, the technical scheme of the utility model is as follows:

the utility model provides a marching type platform truck top resistant material arrangement structure for high temperature annealing stove, includes heat insulating layer, inflation sealing washer, castable periphery, lower floor's supporting brick group, castable inner structure body, peripheral firebrick layer, upper strata bearing brick group and sealed sand layer, the heat insulating layer is used for laying on the platform truck frame, the inflation sealing washer sets firmly on the heat insulating layer, the castable periphery encircles at inflation sealing washer periphery, lower floor's supporting brick group builds in inflation sealing washer inside, and is equipped with the interval of predetermineeing between lower floor's supporting brick group's periphery and inflation sealing washer's the inner peripheral face, castable inner structure body includes main part and the periphery of integrated into one piece in main part bottom periphery, and main part is formed with the fretwork hole of matching accommodation lower floor's supporting brick group to the cladding lower floor's supporting brick group, the periphery is filled in the lower extreme in the interval, and correspondingly the upper end in the interval forms the sand groove, the periphery is built in the castable periphery, the upper strata corresponds to be built in the lower floor's supporting brick group on the sand groove.

Further, the periphery of the castable surrounds the periphery of the lower end of the expansion sealing ring, the peripheral refractory brick layer is built on the top surface of the periphery of the castable, the periphery of the upper end of the expansion sealing ring surrounds the periphery of the upper end of the expansion sealing ring, and the height of the peripheral refractory brick layer after being built is equal to the height of the expansion sealing ring.

Further, the lowest layer of the peripheral refractory brick layer extends outwards for a preset length to form a side curved sealing convex part, the side curved sealing convex part is used for being matched with a corresponding side curved sealing concave part formed on a furnace wall, one end of the uppermost layer forms an upper curved sealing concave part, the other end forms an upper curved sealing convex part, so that when adjacent trolleys are connected, the end face curved sealing is matched with one end of the uppermost layer to form an upper curved sealing concave part, and the other end forms an upper curved sealing convex part, so that when adjacent trolleys are connected, the end face curved sealing is matched.

Further, anchoring parts connected to the trolley frame are embedded in the periphery of the castable and the inner structure of the castable.

Further, the upper layer bearing brick group comprises a lower layer bearing brick and an upper layer bearing brick, wherein the upper surface of the lower layer bearing brick is provided with a concave arc groove, the lower surface of the upper layer bearing brick is provided with a convex arc groove, and the concave arc groove is matched with the convex arc groove.

Further, the refractory arrangement structure comprises a bearing disc, the size of which corresponds to the size of the top surface of the upper layer bearing brick group and is used for being paved on the top surface of the inner structure body of the casting material.

In addition, the utility model provides a hood-type stepping trolley for a high-temperature annealing furnace, which comprises a trolley frame, a cylinder hood and a refractory arrangement structure, wherein a heat insulation layer of the refractory arrangement structure is paved on the trolley frame, the cylinder hood is covered with an upper layer bearing brick group of the refractory arrangement structure, and the lower end of the cylinder hood is inserted into the sand tank.

Further, a plurality of air pipes are arranged on the frame, extend out of the expansion sealing ring and protrude out of the top surface of the upper layer bearing brick group or the top surface of the bearing disc, and are used for filling or discharging protective gas into the cylinder cover.

Compared with the prior art, the utility model has the following beneficial effects:

1. the design of the arrangement structure of the refractory materials at the top of the stepping trolley is reasonable, and the arrangement of the refractory materials of the trolley is reasonably distributed according to heat conduction and bearing parts, so that the thermal shock capability is improved, and the service life of the refractory materials is prolonged.

2. Low maintenance cost and high equipment utilization rate: the high-strength castable is adopted in the pouring part of the trolley refractory, and the pouring part is only required to be replaced regularly according to the damage of the top-layer insulating bricks, so that the trolley refractory is fast to maintain and replace and can be quickly put into use after maintenance.

Drawings

FIG. 1 is a side view of a stepped pallet truck for a high temperature lehr according to a first preferred embodiment of the present utility model;

FIG. 2 is a cross-sectional view (i.e., front view) of the stepped trolley A-A shown in FIG. 1;

fig. 3 is an enlarged view at B shown in fig. 2;

FIG. 4 is an exploded view of the step-by-step trolley shown in FIG. 1;

FIG. 5 is a top view of the step-by-step trolley shown in FIG. 1;

FIG. 6 is a side view of two of the step dollies shown in FIG. 1 connected in a furnace;

fig. 7 is a sectional view of a step-by-step type carriage for a high temperature annealing furnace according to a second preferred embodiment of the present utility model.

The reference numerals are explained as follows:

100-cover type stepping trolley; 10-a frame; 40-coil of steel; 20-a refractory arrangement; 30-a cylinder cover; 21-a heat insulation layer; 22-expanding sealing rings; 23-the periphery of the castable; 231-lower curved sealing convex part; 232-lower curved seal recess; 24-lower layer support brick sets; 25-a castable inner structure; 26-a peripheral refractory brick layer; 27-an upper layer bearing brick group; 28-sealing the sand layer; 241-primary high alumina mullite brick; 242-second-level high alumina bricks; 251-a body portion; 252-circumference; 201-anchoring member; 261-side bending convex part; 262-upper curved seal concave part; 281-pad cotton; 282-quartz sand; 29-a load-bearing disc; 11-trachea; 221-fiber blanket.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1 to 5, a first preferred embodiment of the present utility model is a hood-type step-by-step type trolley 100 for a high temperature annealing furnace for carrying a coil of steel 40 for transportation in the annealing furnace. The hood-type stepping trolley 100 comprises a frame 10, a refractory arrangement structure 20 arranged at the top of the frame 10, and a barrel hood 30, wherein the refractory arrangement structure 20 is used for bearing steel coils, and the barrel hood 30 is used for enclosing the steel coils 40.

The refractory arrangement 20 includes a heat shield 21, an expansion seal 22, a castable outer periphery 23, a lower set of support bricks 24, a castable inner structure 25, a peripheral refractory brick layer 26, an upper set of load bearing bricks 27, and a sealing sand layer 28. The heat insulation layer 21 is paved on the trolley frame 10 to reduce or block heat transfer between the refractory material and the trolley frame 10, and the heat insulation layer 21 can be made of aluminum silicate fiber semi-hard plates, so that a better heat insulation effect is achieved. The expansion sealing ring 22 is arranged on the heat insulation layer 21 and is used for dividing the refractory material into an inner side and an outer side of the expansion sealing ring 22, and the expansion sealing ring can buffer the heated refractory material to prolong the service life of the refractory material. The expansion seal 22 may be made of heat-resistant stainless steel, and it is understood that the expansion seal 22 may be fixed on the heat-insulating layer 21, or may be welded on the frame 10 and protrude from the heat-insulating layer 21. In this embodiment, the expansion seal ring 22 adopts a side-by-side integrally formed double-ring structure, and the double rings can be communicated or separated by a partition wall, and the height of the partition wall can be lower than that of the expansion seal ring.

The castable periphery 23 surrounds the periphery of the expansion seal ring 22, specifically, the castable periphery 23 is poured on the heat insulation layer 21 through the castable, surrounds the periphery of the expansion seal ring 22, and is lower than the expansion seal ring 22. It will be appreciated that a form may be used to control the profile when casting to form the castable periphery 23. Further, a lower curved sealing protrusion 231 is formed at one end of the outer periphery of the castable periphery 23, and a lower curved sealing recess 232 is formed at the opposite end, so that when two adjacent trolleys are butted side by side, the lower curved sealing protrusion 231 at one end of one trolley is matched with the lower curved sealing recess 232 at one end of the other trolley, so as to block heat transfer in the furnace below the refractory arrangement structure 20.

The lower layer support brick set 24 is built in the expansion seal ring 22, and a preset interval is arranged between the outer periphery of the lower layer support brick set 24 and the inner peripheral surface of the expansion seal ring 22. In this embodiment, two lower support brick sets 24 are respectively built in each annular ring of the expansion sealing ring 22 in a disc shape, and a preset interval is provided between each lower support brick set 24 and the inner wall of the annular ring of the corresponding expansion sealing ring 22. The lower layer support brick group 24 is formed by stacking bricks into a plurality of brick columns, then the plurality of brick columns are surrounded into disc-shaped furnishings, fan-shaped gaps are formed between adjacent brick columns, and the plurality of brick columns distributed in disc shapes are surrounded into a cylindrical center hole. The height of the lower support brick set 24 is approximately equal to the height of the expansion seal ring 22 or slightly higher than the height of the expansion seal ring 22, and thus the depth of the space between the outer periphery of the lower support brick set 24 and the inner peripheral surface of the expansion seal ring 22 is approximately equal to the height of the expansion seal ring 22.

The lower layer support brick set 24 may be made of a first-stage mullite brick and a second-stage mullite brick, and in this embodiment, the lower layer support brick set 24 includes three layers of first-stage mullite bricks 241 and four layers of second-stage mullite bricks 242.

Referring to fig. 4, the pouring material inner structure 25 is formed by pouring corresponding to each lower layer support brick set 24, the pouring material inner structure 25 is convex, and includes a main body portion 251 and a peripheral edge 252 integrally formed at the periphery of the bottom end of the main body portion 251, the main body portion 251 is correspondingly formed with hollow holes for accommodating the lower layer support brick sets 24 in a matching manner, the main body portion 251 coats the lower layer support brick sets 24, the peripheral edge 252 is filled at the inner lower end of the space, a sand groove is correspondingly formed at the upper end of the space, and the depth of the sand groove corresponds to the height of the expansion seal ring 22 exceeding the top surface of the peripheral edge 252. The pouring material inner structure 25 is poured on the heat insulation layer 21 through the pouring material and coats the lower support brick group 24, during pouring, the shape can be controlled through a template, the pouring material fills a preset height in the interval to form the periphery, the main body part 251 is formed by penetrating the pouring material into gaps among brick columns of the lower support brick group 24, the positions corresponding to the brick columns are hollowed-out holes in the main body part 251, and the top end of the main body part 251 is horizontal. After the casting material inner structure 25 is formed, the height of the main body 251 is equal to that of the lower layer support brick set 24. In this embodiment, the number of the castable inner structures 25 corresponds to the number of the lower layer supporting brick sets 24, and the two castable inner structures 25 can be connected into a whole by casting.

Further, the castable periphery 23, and the castable inner structure 25 may be integrally cast with a high strength steel fiber wear resistant castable.

Further, the outer periphery 23 of the casting material and the inner structure 25 of the casting material may be embedded with a Y-shaped anchor 201 connected to the trolley frame 10, and the anchor 201 is vertically arranged in the outer periphery 23 of the casting material and the inner structure 25 of the casting material, so as to improve the stability of the outer periphery 23 of the casting material and the inner structure 25 of the casting material.

The peripheral refractory brick layer 26 is built on the top surface of the castable periphery 23, surrounds the periphery of the upper end of the expansion seal ring 22, the built height is approximately equal to the height of the expansion seal ring 22, the peripheral refractory brick layer 26 can be made of a first-stage high-alumina mullite brick, in this embodiment, the peripheral refractory brick layer 26 is made of a third-stage high-alumina mullite brick, wherein the lowest brick layer extends to the outside by a preset length to form a side curved sealing convex portion 261 for being matched with a corresponding side curved sealing concave portion formed on a furnace wall, one end of the uppermost layer forms an upper curved sealing concave portion 262 (namely, the uppermost layer is in a step structure with an adjacent middle layer), and the other end forms an upper curved sealing convex portion 263 (namely, the uppermost layer protrudes towards the outer end relative to the adjacent middle layer) so that when two adjacent trolleys are connected, end curved sealing between the trolleys is realized through end surface matching, and heat transfer below the refractory arrangement structure 20 in the furnace is blocked through the side curved sealing between the furnace wall and the end curved sealing between trolleys. Referring specifically to fig. 6, two adjacent trolleys are connected side by side in the annealing furnace, and when the two trolleys are connected, the end faces (the rear end face of the preceding trolley in the conveying direction and the front end face of the following trolley) which are connected correspondingly are connected by an end face curved seal.

The upper layer bearing brick set 27 is laid on the lower layer supporting brick set 24, and the lower end face of the upper layer bearing brick set 27 corresponds to the shape and the size of the upper end face of the lower layer supporting brick set 24. Similarly, the upper layer bearing brick group 27 is formed by stacking bricks into a plurality of brick columns, then the plurality of brick columns are surrounded into disc-shaped furnishings, fan-shaped gaps are formed between adjacent brick columns, and the plurality of brick columns which are disc-shaped furnishings are surrounded into a cylindrical center hole; in this embodiment, two upper layer bearing brick sets 27 are correspondingly laid on the corresponding lower layer supporting brick set 24, and each brick column of the upper layer bearing brick set 27 is correspondingly laid on the brick column of the lower layer supporting brick set 24. Further, the upper layer bearing brick set 27 includes a lower layer bearing brick and an upper layer bearing brick, the upper surface of the lower layer bearing brick has a concave arc groove, the lower surface of the upper layer bearing brick has a convex arc groove, and the concave arc groove corresponds to the convex arc groove. The concave arc grooves are matched with the convex arc grooves, so that stacking stability between adjacent upper and lower brick layers is improved.

The sealing sand layer 28 is filled in the sand tank, the sealing sand layer 28 comprises pad cotton 281 and quartz sand 282, the pad cotton 281 is arranged on the bottom surface of the sand tank in a pad mode, and the quartz sand 282 is filled in the sand tank. The quartz sand 282 has the following composition by volume: 40 mesh 20% +60 mesh 60% +80 mesh 20%. In this embodiment, the sealing sand layers 28 in the two rings of the expansion seal ring 42 are integrally connected.

Further, the refractory arrangement 20 comprises a load-bearing disc 29 having a size corresponding to the size of the top surface of the upper set of load-bearing bricks 27 for laying on the top surface of the upper set of load-bearing bricks 27 to carry the coil of steel. In this embodiment, two bearing disks 29 are respectively laid on the top surfaces of the corresponding upper layer bearing brick sets 27, and after each bearing disk 29 bears a steel coil, the steel coil is respectively covered by a cylinder cover 30, and the lower end of the cylinder cover 30 is inserted into the sand groove.

Further, the frame 10 is provided with a plurality of air pipes 11, the air pipes 11 extend out of the expansion sealing ring 22 and protrude out of the top surface of the casting material inner structure 25 or the top surface of the bearing disc 29, the air pipes 11 are used for filling protective gas or discharging gas into the cylinder cover 30, if the protective gas needs to be filled with different proportions of gas, the protective gas can be filled through different air pipes 11, and when the protective gas in the cylinder cover 30 needs to be replaced, the gas needs to be replaced after the air is discharged through the air pipes 11. Preferably, at least a central air pipe corresponding to the central axis of the lower layer supporting brick set 24 and the upper layer bearing brick set 27 is arranged on the frame 10, so that air can be directly flushed into the middle part in the cylinder cover 30.

The utility model also provides a method for building the refractory arrangement structure 20 on the top of the step-by-step trolley 100, which comprises the following steps:

1) Laying a heat insulation layer 21 on the trolley frame 10;

2) An expansion seal ring 22 is fixedly arranged on the heat insulation layer 21; or welding an expansion sealing ring 22 on the frame 10 and protruding out of the heat insulation layer 21;

3) A lower layer support brick set 24 is built in the expansion sealing ring 22, and a preset interval is arranged between the periphery of the lower layer support brick set 24 and the inner peripheral surface of the expansion sealing ring 22; the height of the lower support brick set 24 is approximately equal to the height of the expansion seal ring 22;

4) Providing a casting material to be cast into the expansion seal ring 22, and providing a template to control an inflow space of the casting material so that the casting material flows into a preset height in the interval to form the peripheral edge 252, and the casting material flows into a gap of the lower support brick group 24 and coats the lower support brick group 24 to form the main body 251, thereby forming the casting material inner structure 25; the top end of the main body 251 is equal to the lower layer support brick group 24 in height; the peripheral edge 252 fills the lower end of the space, and correspondingly forms the sand groove at the upper end of the space;

5) An upper layer bearing brick group 27 corresponding to the lower layer support brick group 24 is built on the top surface of the pouring material inner structure 25 (also can be regarded as the top surface of the lower layer support brick group 24);

6) Casting a casting material on the periphery of the expansion seal ring 22 to form a casting material periphery 23; in particular, providing a profile of a formwork control castable periphery 23, the castable periphery 23 surrounding the periphery of the expansion seal ring 22 and being lower than the height of the expansion seal ring 22, the peripheral profile of the castable periphery 23 preferably being selected to be rectangular;

7) Laying a peripheral layer of refractory bricks 26 on top of the castable periphery 23; a peripheral layer of firebricks 26 surrounds the upper periphery of the expansion seal ring 22 and has a height substantially equal to the height of the expansion seal ring 22 after construction;

8) And filling the sand tank with a sealing sand layer 28.

It will be appreciated that steps 6), 7) may also be laid between steps 2) and 3);

it will be appreciated that the process of installing the load bearing disks 29 on the upper layer load bearing brick sets 27 is also included;

it will be appreciated that the process of welding the Y-anchors 201 to the frame 10 prior to casting the castable outer periphery 23 and prior to casting the castable inner structure 25 is also included.

According to the first preferred embodiment of the present utility model, the frame of the step-by-step type trolley can be provided with a refractory arrangement structure for carrying, processing and conveying a plurality of steel coils, and the structural principle of the refractory arrangement structure is the same as that of the preferred embodiment.

In addition, according to the first preferred embodiment of the present utility model, a refractory arrangement structure for carrying only one steel coil is also obtained, and referring to fig. 7, the second preferred embodiment of the present utility model is different from the first preferred embodiment in that the expansion seal ring 22 is only required to have a single-coil structure, so that the lower layer support brick set 24, the castable inner structure 25, the upper layer support brick set 27, and the sealing sand layer 28 are constructed in a single-coil of the expansion seal ring 22, the construction structure is the same as that of the first preferred embodiment, and the castable periphery 23 and the peripheral refractory brick layer 26 are constructed corresponding to the peripheral outline of the expansion seal ring 22 outside the expansion seal ring 22.

It will be appreciated that a fiber blanket 221 may be further disposed between the outer peripheral side of the expansion seal ring 22 and the castable periphery 23 and the peripheral refractory brick layer 26, so as to perform a better heat-insulating effect.

In conclusion, the refractory arrangement structure of the hood-type stepping trolley for the high-temperature annealing furnace has reasonable structural design and long service life; the trolley refractory material is reasonably distributed according to the heat conduction and bearing parts, so that the thermal shock capability is improved, and the service life of the refractory material is prolonged; and the maintenance cost is low, and the equipment utilization rate is high: the high-strength castable is adopted in the pouring part of the trolley refractory, and the pouring part is only required to be replaced regularly according to the damage of the top-layer insulating bricks, so that the trolley refractory is fast to maintain and replace and can be quickly put into use after maintenance.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the same way.

Claims (8)

1. Cover formula step-by-step platform truck top resistant material arrangement structure (20), its characterized in that: comprises a heat-insulating layer (21), an expansion sealing ring (22), a castable periphery (23), a lower layer supporting brick group (24), a castable inner structure (25), a peripheral refractory brick layer (26), an upper layer bearing brick group (27) and a sealing sand layer (28), wherein the heat-insulating layer (21) is used for being laid on a trolley frame (10), the expansion sealing ring (22) is fixedly arranged on the heat-insulating layer (21), the castable periphery (23) surrounds the periphery of the expansion sealing ring (22), the lower layer supporting brick group (24) is built in the expansion sealing ring (22), a preset interval is arranged between the periphery of the lower layer supporting brick group (24) and the inner peripheral surface of the expansion sealing ring (22), the castable inner structure (25) comprises a main body part (251) and a periphery (252) integrally formed at the periphery of the bottom end of the main body part (251), the main body part (251) is provided with hollowed-out holes matched with the lower layer supporting brick group (24) so as to cover the lower layer supporting brick group (24), the periphery (252) is filled in the periphery of the lower layer supporting brick group (24) at the inner periphery of the corresponding to the upper layer supporting brick group (24), the periphery of the upper layer supporting brick group (27) is built at the periphery of the upper layer (24), and the sealing sand layer is filled in the sand groove.

2. The hood-type stepped trolley top refractory arrangement (20) of claim 1, wherein: the castable periphery (23) surrounds the periphery of the lower end of the expansion sealing ring (22), the peripheral refractory brick layer (26) is built on the top surface of the castable periphery (23), surrounds the periphery of the upper end of the expansion sealing ring (22), and the built height of the peripheral refractory brick layer (26) is equal to the height of the expansion sealing ring (22).

3. The hood-type stepped trolley top refractory arrangement (20) of claim 2, wherein: the lowest layer of the peripheral refractory brick layer (26) stretches outwards for a preset length to form a side curved sealing convex part (261) which is used for being matched with a corresponding side curved sealing concave part formed on a furnace wall, one end of the uppermost layer forms an upper curved sealing concave part (262), and the other end forms an upper curved sealing convex part (263) so as to be matched with the end face curved sealing when adjacent trolleys are connected.

4. The hood-type stepped trolley top refractory arrangement (20) of claim 1, wherein: and anchoring parts (201) connected to the trolley frame (10) are embedded in the castable periphery (23) and the castable inner structure (25).

5. The hood-type stepped trolley top refractory arrangement (20) of claim 1, wherein: the upper layer bearing brick group (27) comprises a lower layer bearing brick and an upper layer bearing brick, wherein the upper surface of the lower layer bearing brick is provided with a concave arc groove, the lower surface of the upper layer bearing brick is provided with a convex arc groove, and the concave arc groove is matched with the convex arc groove.

6. The hood-type stepped trolley top refractory arrangement (20) of claim 1, wherein: comprises a bearing disc (29) with the size corresponding to the size of the top surface of the upper layer bearing brick group (27) and is used for being paved on the top surface of the casting material inner structure body (25).

7. A cover-type stepping trolley (100) comprising a trolley frame (10) and a cylinder cover (30), and is characterized by comprising the stepping trolley top refractory arrangement structure (20) as claimed in any one of claims 1-6, wherein a heat insulation layer (21) of the refractory arrangement structure (20) is paved on the trolley frame (10), the cylinder cover (30) covers an upper layer bearing brick group (27) of the refractory arrangement structure (20), and the lower end of the cylinder cover (30) is inserted into a sand tank.

8. The hood-type stepping trolley (100) according to claim 7, characterized in that: a plurality of air pipes (11) are arranged on the frame (10), the air pipes (11) extend out of the expansion sealing ring (22) and protrude out of the top surface of the upper layer bearing brick group (27) or the top surface of the bearing disc (29), and the air pipes (11) are used for filling or discharging protective gas into the cylinder cover (30).

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