Feeding rack capable of preserving heat of steel billets

Abstract

The utility model relates to a feeding rack capable of preserving heat of steel billets, and belongs to the technical field of feeding racks. Comprising a box-type heat preservation frame, a furnace inlet box and a furnace outlet box, an opening in the upper surface of the box-type heat preservation frame is fixedly connected with a heat preservation cover body through a supporting beam frame, and transition grooves are formed in the two sides of the box-type heat preservation frame in a penetrating mode. And through the arrangement of the box-type heat preservation frame and the heat preservation cover body, it is ensured that the steel billets are located in a relatively closed storage space in the placing process. And the heat loss of the steel billet is effectively reduced, so that the hot charging rate of the steel billet is improved. Through the arrangement of the in-furnace box and the out-furnace box, when steel billets are transferred, a relatively closed transfer space is formed between the box-type heat preservation frame and the in-furnace box or between the box-type heat preservation frame and the out-furnace box through the arrangement of the outer protective door. According to the box-type heat preservation frame, internal heat loss possibly caused by the box-type heat preservation frame in the steel billet inlet and outlet process is effectively prevented, so that the heat preservation efficiency is greatly improved, the heat preservation time of steel billets is prolonged, and the overall hot charging rate is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of loading platforms, in particular to a loading platform capable of keeping steel billets warm. Background Art

[0002] Continuously cast steel billets refer to steel billets that are continuously cast directly from molten metal through continuous casting technology. The flowing molten metal is injected into the continuous casting machine, and then cooled and solidified to form long strips of steel billets on the continuous casting belt. The steel billets are then cut into fixed lengths by a hot shear, and finally conveyed to a heating furnace through a conveyor line for subsequent processing, which can effectively utilize the waste heat of the continuously cast steel billets and reduce heating energy consumption.

[0003] In order to ensure that the heating furnace can continuously supply steel billets, special loading racks are usually installed at the steel inlet of the heating furnace. These loading racks can be used to place the steel billets transported from the conveyor line.

[0004] However, although the traditional loading platform can provide the function of placing the steel billet, it cannot effectively keep the steel billet warm during the placement process. This deficiency causes a large amount of residual heat of the steel billet to be lost while the steel billet is waiting to enter the heating furnace, thereby reducing the hot charging rate of the steel billet. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a loading platform that can keep the steel billet warm. The technical solution of the utility model is as follows:

[0006] A loading platform for keeping steel billets warm, comprising a box-type insulation rack, a furnace entry box and a furnace exit box, the upper surface opening of the box-type insulation rack is fixedly connected to a heat preservation cover body through a supporting beam frame, transition grooves are penetrated on both sides of the box-type insulation rack, and the transition grooves are closed by an openable and closable inner protective door, and support seats for supporting the inner protective door are fixedly connected to the outer walls of both sides of the box-type insulation rack and located below the transition grooves, the furnace entry box is fixedly connected to one side of the support seat located on the right side, and a side of the furnace entry box close to the support seat is penetrated with an opening and communicated with the transition groove, a furnace entry port is penetrated on the front side of the furnace entry box, and the furnace entry port is closed by an openable and closable outer protective door, and the furnace exit box is fixedly connected to the left side. On one side of the support seat, the side of the furnace discharge box close to the support seat has an opening through it and is communicated with the transition groove, the rear side of the furnace discharge box has a furnace outlet, and the furnace outlet is closed by an openable and closeable external protective door, the interior of the furnace inlet box and the furnace discharge box are both connected with a driving member for driving the movement of the steel billet, the interior of the furnace inlet box and the side away from the box-type insulation rack are connected with a steel pusher for pushing the steel billet into the box-type insulation rack, the interior of the furnace discharge box and the side away from the box-type insulation rack are connected with a steel taking machine for taking the steel billet out of the box-type insulation rack, the inner bottom wall of the box-type insulation rack is connected with a support frame, and the lower surface of the transition groove, the upper surface of the support seat, the top height of the roller of the driving member and the top height of the support frame are on the same line.

[0007] Optionally, the inner walls of the box-type insulation rack and the insulation cover are coated with high temperature resistant paint.

[0008] Optionally, the interior of the box-type thermal insulation frame and the thermal insulation cover are filled with polyurethane foam.

[0009] Optionally, sliding members are connected to both sides of the inner protective door, and the sliding members include guide blocks, and the guide blocks are fixedly connected to the side walls of the inner protective door. Guide rails 1 are fixedly connected to both sides of the support seat, and guide grooves are provided on the upper surface of the guide rails 1, and the guide blocks are slidably connected to the inside of the guide grooves.

[0010] Optionally, the sliding member also includes a fixed block and a roller, the fixed block is fixedly connected to one side of the guide block, the roller is rotatably connected to both sides of the fixed block through a short shaft, a sliding groove is provided on the upper surface of the guide rail and on one side of the guide groove, and the guide groove is connected to the sliding groove, and the roller is slidably connected to the inside of the sliding groove.

[0011] Optionally, a fixing seat is fixedly connected to the upper surface of the inner protective door, and a hydraulic rod for opening or closing the inner protective door is fixedly connected to the lower surface of the fixing seat and the side away from the inner protective door, and the hydraulic rod is fixedly connected to the upper surfaces of the furnace inlet box and the furnace outlet box.

[0012] Optionally, guide rails 2 are fixedly connected to both sides of the furnace entrance, and the outer protective door is slidably connected to the guide rails 2.

[0013] Optionally, a connecting seat is fixedly connected to the upper surface of the outer protective door, and a hydraulic rod 2 for opening or closing the outer protective door is fixedly connected to the lower surface of the connecting seat and the side away from the outer protective door, and the hydraulic rod 2 is fixedly connected to the upper surfaces of the furnace inlet box and the furnace outlet box.

[0014] Optionally, the support frame includes three groups of fixed pads and four groups of rolling pads, and two groups of rolling pads are arranged inside every two groups of fixed pads. The rolling pads include I-shaped steel, which is fixedly connected to the inner bottom wall of the box-type insulation frame. Multiple groups of C-shaped seats are fixedly connected to the upper surface of the I-shaped steel, and rollers are rotatably connected to the inner side of the C-shaped seats.

[0015] All the above optional technical solutions can be combined arbitrarily, and the present utility model does not provide detailed descriptions of the structures after the combinations.

[0016] By means of the above scheme, the beneficial effects of the utility model are as follows:

[0017] 1. Through the setting of the box-type insulation rack and the insulation cover, the insulation cover is buckled on the box-type insulation rack, and a group of transition slots are opened on each side to provide in and out transition slots for the steel billets. Internal protective doors are installed on both sides of the transition slot to ensure that the steel billets are in a relatively closed storage space during the placement process. The heat loss of the steel billets is effectively reduced, thereby improving the hot loading rate of the steel billets and further reducing energy consumption.

[0018] 2. Through the setting of the inlet box and the outlet box, when the billet enters and exits the box-type insulation rack, it will pass through the inlet box and the outlet box for transition. The advantage of this is that when the billet is transferred, the box-type insulation rack and the inlet box or the box-type insulation rack and the outlet box form a relatively closed transfer space through the setting of the outer protective door. It effectively prevents the internal heat loss that may be caused by the box-type insulation rack during the process of billet entering and exiting, thereby greatly improving the insulation efficiency, making the billet insulation time longer, and further improving the overall hot charging rate.

[0019] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall appearance structure of the loading stand for heat-insulating steel billets provided by the utility model;

[0021] Figure 2The overall front cross-sectional view of the loading platform for heat-insulating steel billets provided by the utility model;

[0022] Figure 3 The overall top view of the cross-sectional view of the loading platform for heat-insulating steel billets provided by the utility model;

[0023] Figure 4 This is a schematic diagram of the overall exploded structure of the loading platform for heat-insulating steel billets provided by the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the box-type heat preservation rack, the support seat and the support rack in the utility model;

[0025] Figure 6 It is a schematic diagram of the structure of the matching of the sliding member and the guide rail in the utility model;

[0026] Figure 7 It is a schematic diagram of the exploded structure of the furnace inlet box in the utility model;

[0027] Figure 8 It is a schematic diagram of the exploded structure of the rolling pad in the utility model.

[0028] Numbers in the figure: 1. box-type insulation rack; 11. transition groove; 12. support beam frame; 2. insulation cover; 3. inner protective door; 31. sliding member; 311. guide block; 312. fixed block; 313. roller; 32. fixed seat; 33. hydraulic rod one; 4. support seat; 41. guide rail one; 411. slide groove; 412. guide groove; 5. furnace entry box; 51. furnace entry port; 52. guide rail two; 53. outer protective door; 531. connecting seat; 532. hydraulic rod two; 6. furnace exit box; 61. furnace exit port; 7. driving member; 8. steel pusher; 9. steel taker; 10. support frame; 101. fixed cushion seat; 102. rolling cushion seat; 1021. I-shaped steel; 1022. C-shaped seat; 1023. roller. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] See also Figure 1-8As shown, the utility model provides a loading platform for heat-insulating steel billets, including a box-type heat-insulating frame 1, a furnace entry box 5 and a furnace exit box 6. The upper surface opening of the box-type heat-insulating frame 1 is fixedly connected to a heat-insulating cover body 2 through a support beam frame 12. Transition grooves 11 are penetrated on both sides of the box-type heat-insulating frame 1. The transition grooves 11 are closed by an openable inner protective door 3. Support seats 4 for supporting the inner protective door 3 are fixedly connected to the outer walls of both sides of the box-type heat-insulating frame 1 and are located below the transition grooves 11. The furnace entry box 5 is fixedly connected to one side of the support seat 4 located on the right side. The side of the furnace entry box 5 close to the support seat 4 is penetrated by an opening and communicates with the transition groove 11. The front side of the furnace entry box 5 is penetrated by an inlet 51, and the inlet 51 is connected to the It is closed by an openable and closeable external protective door 53, the furnace discharge box 6 is fixedly connected to one side of the support seat 4 located on the left side, the side of the furnace discharge box 6 close to the support seat 4 is penetrated by an opening and communicated with the transition groove 11, and the rear side of the furnace discharge box 6 is penetrated by a furnace discharge port 61, and the furnace discharge port 61 is closed by an openable and closeable external protective door 53, the interior of the furnace inlet box 5 and the furnace discharge box 6 are both connected with a driving member 7 for driving the movement of the steel billet, the interior of the furnace inlet box 5 and the side away from the box-type insulation rack 1 are connected with a steel pusher 8 for pushing the steel billet into the box-type insulation rack 1, the interior of the furnace discharge box 6 and the side away from the box-type insulation rack 1 are connected with a steel taking machine 9 for taking the steel billet out of the box-type insulation rack 1, and the inner bottom wall of the box-type insulation rack 1 is connected with a support frame 10.

[0031] The utility model realizes the function of heat preservation and storage of steel billets by setting a box-type heat preservation rack 1, a furnace entry box 5 and a furnace exit box 6. During operation, the steel billets are first transported to the furnace entry box 5. When the outer protective door 53 at the furnace entrance 51 of the furnace entry box 5 is closed, the inner protective door 3 of the box-type heat preservation rack 1 close to the furnace entry box 5 is opened. At this time, the furnace entry box 5 and the box-type heat preservation rack 1 form a closed space. Then, the steel billets in the furnace entry box 5 are pushed into the box-type heat preservation rack 1 by the steel pusher 8. After the pushing is completed, the inner protective door 3 is closed. When steel is discharged, the inner protective door 3 close to the furnace exit box 6 is opened first, and then the steel taker 9 is used to hook the steel billets into the furnace exit box 6. At this time, the furnace exit box 6 and the box-type heat preservation rack 1 form a closed space. Then, the inner protective door 3 is closed. At this time, the box-type heat preservation rack 1 is in a closed state. Finally, the outer protective door 53 at the outlet 61 of the outlet box 6 is opened to directly transport the steel billet into the heating furnace.

[0032] When the billet enters and exits the box-type insulation rack 1, it will be transferred through the furnace entry box 5 and the furnace exit box 6. During the process of transferring the billet between the furnace entry box 5 and the box-type insulation rack 1 or the box-type insulation rack 1 and the furnace exit box 6, the outer protective door 53 is in a closed state. At this time, the furnace entry box 5 and the box-type insulation rack 1 or the box-type insulation rack 1 and the furnace exit box 6 will form a closed space, which effectively avoids the loss of internal heat. At the same time, when the billet needs to enter the furnace entry box 5 or the billet needs to be moved out of the furnace exit box 6, the inner protective doors 3 on both sides of the box-type insulation rack 1 are in a closed state, and the heat inside the box-type insulation rack 1 will not flow out. The advantage of this is that when the billet enters and exits the box-type insulation rack 1, the loss of heat inside the box-type insulation rack 1 is effectively avoided, the insulation efficiency is effectively improved, the insulation time of the billet is extended, and the hot loading rate is improved.

[0033] The lower surface of the transition groove 11, the upper surface of the support seat 4, the top height of the roller of the driving member 7 and the top height of the support frame 10 are in the same straight line. The purpose of this is to ensure the stability and smoothness of the steel billet during the transverse movement.

[0034] Furthermore, the inner walls of the box-type heat preservation frame 1 and the heat preservation cover 2 are coated with high temperature resistant paint; the presence of the high temperature resistant paint helps to reduce heat loss and improve the heat preservation effect of the box-type heat preservation frame 1 and the heat preservation cover 2. It can reduce the heat conduction between the surface of the box-type heat preservation frame 1 and the heat preservation cover 2 and the external environment, making the internal temperature more stable, thereby reducing energy consumption.

[0035] Furthermore, the box-type heat preservation rack 1 and the heat preservation cover 2 are filled with polyurethane foam; polyurethane foam is an excellent heat preservation material with excellent heat insulation performance. Filling with polyurethane foam can effectively reduce the conduction and loss of heat, improve the heat preservation effect, and thus maintain a stable temperature inside the box-type heat preservation rack 1. Moreover, polyurethane foam has the characteristic of being lightweight, and filling it inside the box-type heat preservation rack 1 and the heat preservation cover 2 can effectively reduce the overall weight, making it easier to maintain later.

[0036] Furthermore, both sides of the inner protective door 3 are connected with a sliding member 31, and the sliding member 31 includes a guide block 311, and the guide block 311 is fixedly connected to the side wall of the inner protective door 3. Both sides of the support seat 4 are fixedly connected with a guide rail 1 41, and the upper surface of the guide rail 1 41 is provided with a guide groove 412, and the guide block 311 is slidably connected inside the guide groove 412; when the inner protective door 3 is opened or closed, it will drive the guide blocks 311 on both sides to slide inside the guide groove 412. The guide groove 412 provides a limiting guide function for the guide block 311, ensuring that the inner protective door 3 can move along the direction of the guide groove 412.

[0037] Furthermore, the sliding member 31 further includes a fixed block 312 and a roller 313, wherein the fixed block 312 is fixedly connected to one side of the guide block 311, and the roller 313 is rotatably connected to both sides of the fixed block 312 through a short shaft, and a slide groove 411 is provided on the upper surface of the guide rail 41 and located on one side of the guide groove 412, and the guide groove 412 is connected to the slide groove 411, and the roller 313 is slidably connected inside the slide groove 411; when the inner protective door 3 drives the guide block 311 to slide, it also drives the roller 313 to slide inside the slide groove 411. The mutual cooperation between the roller 313 and the slide groove 411 makes the inner protective door 3 open more smoothly.

[0038] Furthermore, a fixing seat 32 is fixedly connected to the upper surface of the inner protective door 3, and a hydraulic rod 33 for opening or closing the inner protective door 3 is fixedly connected to the lower surface of the fixing seat 32 and the side away from the inner protective door 3. The hydraulic rod 33 is fixedly connected to the upper surfaces of the furnace inlet box 5 and the furnace outlet box 6; the inner protective door 3 can be opened and closed by the telescopic operation of the hydraulic rod 33.

[0039] Furthermore, two guide rails 52 are fixedly connected to both sides of the furnace entrance 51, and the outer protective door 53 is slidably connected to the two guide rails 52. A connecting seat 531 is fixedly connected to the upper surface of the outer protective door 53, and a hydraulic rod 532 used to open or close the outer protective door 53 is fixedly connected to the lower surface of the connecting seat 531 and the side away from the outer protective door 53. The hydraulic rod 532 is fixedly connected to the upper surface of the furnace entry box 5 and the furnace exit box 6; the outer protective door 53 can be opened and closed by the telescopic operation of the hydraulic rod 532. The two guide rails 52 provide a sliding path for the movement of the outer protective door 53.

[0040] Furthermore, the support frame 10 includes three groups of fixed cushions 101 and four groups of rolling cushions 102, and two groups of rolling cushions 102 are arranged inside every two groups of fixed cushions 101. The rolling cushions 102 include I-shaped steel 1021, which is fixedly connected to the inner bottom wall of the box-type heat preservation frame 1. The upper surface of the I-shaped steel 1021 is fixedly connected to multiple groups of C-shaped seats 1022, and the inner side of the C-shaped seats 1022 is rotatably connected to rollers 1023; the top height of the rollers 1023 is level with the upper surface of the fixed cushions 101, and together they provide a placement platform for the steel billets. Through the arrangement of the rollers 1023, the steel billets can slide smoothly during the movement, and the rotation of the rollers 1023 reduces the wear between the steel billets and the fixed cushions 101. The fixed cushions 101 ensure the flatness of the placement of the steel billets, and effectively avoid the problem caused by the edges and corners of the steel billets being stuck between adjacent rollers 1023 when the steel billets are moving. It not only improves the smoothness of billet movement, but also extends the life of the equipment and the billet itself.

[0041] Working principle: The first step is to transport the steel billet to the furnace entrance 51 of the furnace entry box 5, and then open the outer protective door 53 at the furnace entrance 51 by driving the hydraulic rod 2 532, and drive the roller to rotate through the driving member 7, thereby driving the steel billet to move into the furnace entry box 5. After the steel billet is completely in the furnace entry box 5, the outer protective door 53 is closed. The second step is to open the inner protective door 3 close to the side of the furnace entry box 5 by driving the hydraulic rod 1 33, so that the opening on one side of the furnace entry box 5 is in a connected state with the transition groove 11. Drive the steel pusher 8 to push the steel billet located above the roller of the driving member 7 onto the support frame 10 of the box-type insulation frame 1. After the steel billet is completely pushed in, close the inner protective door 3. The third step is to install a steel moving machine inside the support frame 10 and below the steel billet, which can move the steel billet on the support frame 10 to the side of the furnace exit box 6 in sequence. In the fourth step, when the billet needs to be supplied to the heating furnace, the inner protective door 3 near the furnace box 6 is first opened, and then the billet is hooked to the roller of the driving member 7 inside the furnace box 6 by the steel taking machine 9. After the billet is completely taken out, the inner protective door 3 is closed. In the fifth step, the outer protective door 53 at the furnace outlet 61 is opened, and the roller is driven to rotate by the driving member 7, thereby driving the billet to move out of the furnace box 6. After the billet is completely taken out, the outer protective door 53 is closed, and finally it is transported to the inside of the heating furnace through the conveying device.

[0042] It should be noted that the driving member 7, steel pusher 8, steel taker 9 and steel transfer machine mentioned above are all prior art in the art and will not be described in detail herein. The driving member 7 refers to a motor driving the roller to rotate so as to achieve the purpose of moving the steel billet.

[0043] All the electrical devices mentioned above are electrically connected to the main controller.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A loading platform capable of keeping the steel billet warm, characterized in that: The invention comprises a box-type heat preservation frame (1), a furnace inlet box (5) and a furnace outlet box (6); the upper surface opening of the box-type heat preservation frame (1) is fixedly connected to a heat preservation cover body (2) through a support beam frame (12); transition grooves (11) are provided through both sides of the box-type heat preservation frame (1); the transition grooves (11) are closed by an openable inner protective door (3); the outer walls of both sides of the box-type heat preservation frame (1) and located below the transition grooves (11) are fixedly connected to the inner protective door (3) for supporting the inner protective door (3); The furnace entry box (5) is fixedly connected to a side of the support base (4) located on the right side, a side of the furnace entry box (5) close to the support base (4) is penetrated with an opening and communicates with the transition groove (11), a furnace entry opening (51) is penetrated and opened on the front side of the furnace entry box (5), and the furnace entry opening (51) is closed by an openable and closable outer protective door (53), and the furnace exit box (6) is fixedly connected to the support base (4) located on the left side. The furnace discharge box (6) has an opening on one side thereof close to the support seat (4) and communicates with the transition groove (11). The furnace discharge box (6) has an opening on the rear side thereof and is provided with a furnace discharge port (61). The furnace discharge port (61) is closed by an openable and closable external protective door (53). The interiors of the furnace inlet box (5) and the furnace discharge box (6) are both connected with a driving member (7) for driving the movement of the steel billet. The interior of the furnace inlet box (5) and the side thereof far from the box-type heat preservation rack (1) are connected with a A steel pusher (8) pushes the steel billet into the box-type heat-insulating rack (1); a steel taker (9) is connected to the inside of the furnace discharge box (6) and on the side away from the box-type heat-insulating rack (1) to take the steel billet out of the box-type heat-insulating rack (1); a support frame (10) is connected to the inner bottom wall of the box-type heat-insulating rack (1); and the lower surface of the transition groove (11), the upper surface of the support seat (4), the top height of the roller of the driving member (7) and the top height of the support frame (10) are in the same straight line.

2. A loading platform capable of keeping the steel billet warm according to claim 1, characterized in that: The inner walls of the box-type heat preservation frame (1) and the heat preservation cover (2) are both coated with high temperature resistant paint.

3. A loading platform capable of keeping the steel billet warm according to claim 1, characterized in that: The interiors of the box-type thermal insulation frame (1) and the thermal insulation cover (2) are both filled with polyurethane foam.

4. A loading platform capable of keeping the steel billet warm according to claim 1, characterized in that: Both sides of the inner protective door (3) are connected with sliding members (31), and the sliding members (31) include guide blocks (311). The guide blocks (311) are fixedly connected to the side walls of the inner protective door (3). Both sides of the support seat (4) are fixedly connected with guide rails 1 (41), and the upper surface of the guide rails 1 (41) is provided with guide grooves (412), and the guide blocks (311) are slidably connected inside the guide grooves (412).

5. A loading platform capable of keeping the steel billet warm according to claim 4, characterized in that: The sliding member (31) further comprises a fixed block (312) and a roller (313); the fixed block (312) is fixedly connected to one side of the guide block (311); the roller (313) is rotatably connected to both sides of the fixed block (312) via a short shaft; a slide groove (411) is provided on the upper surface of the guide rail (41) and located on one side of the guide groove (412); the guide groove (412) is connected to the slide groove (411); and the roller (313) is slidably connected inside the slide groove (411).

6. A loading platform capable of keeping the steel billet warm according to claim 1, characterized in that: The upper surface of the inner protective door (3) is fixedly connected to a fixing seat (32), and the lower surface of the fixing seat (32) and the side away from the inner protective door (3) is fixedly connected to a hydraulic rod (33) for opening or closing the inner protective door (3), and the hydraulic rod (33) is fixedly connected to the upper surfaces of the furnace inlet box (5) and the furnace outlet box (6).

7. A loading platform capable of keeping the steel billet warm according to claim 1, characterized in that: The two sides of the furnace inlet (51) are fixedly connected with a second guide rail (52), and the outer protective door (53) is slidably connected to the second guide rail (52).

8. The loading platform capable of keeping the steel billet warm according to claim 1, characterized in that: The upper surface of the outer protective door (53) is fixedly connected to a connecting seat (531), and the lower surface of the connecting seat (531) and the side away from the outer protective door (53) are fixedly connected to a hydraulic rod 2 (532) for opening or closing the outer protective door (53), and the hydraulic rod 2 (532) is fixedly connected to the upper surfaces of the furnace inlet box (5) and the furnace outlet box (6).

9. A loading platform capable of keeping the steel billet warm according to claim 1, characterized in that: The support frame (10) comprises three groups of fixed cushion seats (101) and four groups of rolling cushion seats (102), and two groups of rolling cushion seats (102) are arranged inside every two groups of fixed cushion seats (101), and the rolling cushion seats (102) comprise I-shaped steel (1021), and the I-shaped steel (1021) is fixedly connected to the inner bottom wall of the box-type thermal insulation frame (1), and the upper surface of the I-shaped steel (1021) is fixedly connected to multiple groups of C-shaped seats (1022), and the inner side of the C-shaped seat (1022) is rotatably connected to a roller (1023).

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