Preparation method and preparation equipment of thermal shock resistant high-alumina brick

Abstract

The invention relates to a preparation method of a thermal shock resistant high-alumina brick. The preparation method comprises the following steps: S1, preparing a regulator; S2, mixing aggregate; S3, preparing a mixed grinding material; the thermal shock resistant high-alumina brick preparation equipment comprises a mixing and grinding device, a brick press and a tray, the mixing and grinding device comprises a mixing and grinding cylinder, a rotating stand, a grinding wheel and a scraper blade, a discharge port is formed in the lower portion of the circumferential side face of the mixing and grinding cylinder, a guide plate is arranged on the lower side of the discharge port, and a cover plate is arranged at an opening in the upper end of the mixing and grinding cylinder in a closed mode. And the cover plate is provided with a feeding hole. The invention aims to solve or at least alleviate the problem that a fine pore structure in a high-alumina brick is not easy to control when the thermal shock resistant high-alumina brick is produced, and provides a preparation method and preparation equipment of the thermal shock resistant high-alumina brick.

Description

Technical Field

[0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation method and preparation equipment of thermal shock resistant high-alumina bricks. Background Art

[0002] High alumina bricks, also known as high alumina refractory bricks, are refractory materials with a very hard and smooth surface. They are mainly used for lining blast furnaces, hot blast furnaces, electric furnace roofs, blast furnaces, reverberatory furnaces, and rotary kiln linings. In addition, high alumina bricks are also widely used as open-hearth heat storage checker bricks, plugs for pouring systems, nozzle bricks, etc.

[0003] The main factor affecting the thermal shock resistance of high alumina bricks is the thermal stress generated by thermal expansion and contraction during the heating or cooling process. Generally speaking, the greater the thermal expansion rate, the worse the thermal shock resistance of the material, such as silicon bricks, magnesium bricks, etc.; the greater the thermal conductivity, the better the thermal shock resistance of the material, such as silicon carbide products, etc. From the perspective of thermoelasticity theory, the smaller the elastic modulus of the material, the greater the strength, the greater the thermal conductivity, and the better the thermal shock resistance of the product. The energy theory believes that when the product has a higher fracture surface energy, the thermal shock resistance of the product can be improved.

[0004] High alumina bricks have tiny pores due to the heat resistance requirements and the characteristics of the roasting process, which makes the high alumina bricks produce greater internal stress when the temperature changes. When more internal energy is stored, fine cracks can be generated through the high alumina bricks. Releasing these energies that may cause damage to the high alumina bricks can greatly improve the thermal shock resistance of the products. Intentionally introducing microcracks in high alumina bricks to minimize the degree of crack expansion is one of the ways to improve the thermal shock resistance of high alumina bricks.

[0005] When high alumina bricks are pressed into a green body, due to the pressure attenuation in the pressure conduction process, the material usually has a layer density phenomenon of dense at the bottom and sparse at the outside and dense in the middle along the pressing direction. At the same time, there will be expansion and contraction during the sintering process. These processes that cannot be precisely controlled will have a great impact on the fine pore structure in the high alumina bricks. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, solve or at least alleviate the problem of difficulty in controlling the fine pore structure in high-alumina bricks when producing thermal shock resistant high-alumina bricks, and provide a preparation method and preparation equipment for thermal shock resistant high-alumina bricks.

[0007] The present invention is achieved through the following technical solutions:

[0008] A method for preparing a thermal shock resistant high-alumina brick comprises the following steps:

[0009] S1. preparing a conditioning agent, mixing powder, anti-wetting agent and binder uniformly and preheating to obtain a liquid conditioning agent;

[0010] S2. Mixing aggregates: Add aggregates and binders into a mixer and knead for 3 minutes to ensure that the aggregates are fully moistened to obtain mixed aggregates;

[0011] S3, preparing a mixed material, spraying the quantitative regulator in step S1 evenly in a mixing and grinding machine, mixing and grinding for 3 minutes, and obtaining a mixed material;

[0012] S4, spreading the mixed material obtained in step S3 into the tray;

[0013] S5, spreading the material again, repeating steps S3 and S4 until all the regulators are mixed into the mixed aggregate and spread on the tray from bottom to top;

[0014] S6, making brick blanks, pressing the mixed material laid flat in the tray into shape by a brick press to obtain brick blanks;

[0015] S7, heat preservation and drying, heat preservation and drying the bricks in step S6 at 180° C. for 24 hours to obtain dry bricks, wherein the residual moisture of the dry bricks is ≤1.5%;

[0016] S8, calcining, placing the dry blank obtained in step S7 in a tunnel kiln for calcining, calcining at 1300-1350° C. for 4 hours, calcining at 1450-1500° C. for 4 hours, to obtain high alumina bricks.

[0017] In order to further realize the present invention, the following technical solutions may be preferably selected:

[0018] Preferably, the aggregate comprises corundum and homogenized high-alumina bauxite, the powder comprises alumina powder, zirconium dioxide powder and kyanite powder, the binder is a phosphate binder, and the anti-wetting agent is calcium fluoride powder.

[0019] A preparation device for heat-shock-resistant high-alumina bricks, the preparation device comprising a mixing and grinding device, a brick press and a tray, the mixing and grinding device comprising a mixing and grinding drum, a rotating frame, a grinding wheel and a scraper, the mixing and grinding drum is in the shape of a cylinder with an upper end opening, the two grinding wheels are rotatably arranged on both sides of the rotating frame, the two scrapers are fixedly arranged at both ends of the rotating frame, the lower part of the circumferential side of the mixing and grinding drum is provided with a discharge port, the discharge port is detachably provided with a side sealing plate, a guide plate is provided at the lower side of the discharge port, the inner end of the guide plate is connected to the discharge port, and the outer end extends obliquely downward;

[0020] The upper opening of the mixing and grinding drum is sealed with a cover plate, the cover plate is provided with a feed port, and the feed port is eccentrically arranged with the cover plate.

[0021] In order to further realize the present invention, the following technical solutions may be preferably selected:

[0022] Preferably, a liquid guide groove is transversely arranged in the rotating frame, and the liquid guide groove is arranged along the length direction of the rotating frame. A plurality of spray holes are arranged on the lower side of the liquid guide groove, and the upper and lower ends of the spray holes are respectively connected to the liquid guide groove and the bottom surface of the rotating frame;

[0023] A liquid guide tube is fixedly arranged on the upper part of the rotating frame. The liquid guide tube is coaxially arranged with the mixing and grinding drum, and the lower end of the liquid guide tube is connected to the liquid guide groove.

[0024] Preferably, a flattening conveying assembly is arranged between the mixing and grinding equipment and the brick press, and the flattening conveying assembly includes a flattening conveying device and a pallet, the flattening conveying device is a belt conveyor, a section of the belt conveyor close to its tail end is a flattening section, the flattening section is located below the guide plate of the mixing and grinding equipment, the pallet is placed on the conveyor belt of the belt conveyor, the belt conveyor drives the pallet to translate along its length direction, and the pallet translates back and forth when it is located in the flattening section of the belt conveyor.

[0025] Preferably, the flat section of the belt conveyor is provided with a vibration device, and the vibration device causes the pallet to vibrate continuously when the flat section reciprocates.

[0026] Preferably, the paving conveying assembly also includes a forming conveying plate, which is flat and located at the head end of the belt conveyor. The upper surface of the forming conveying plate is flush with the upper surface of the conveyor belt of the belt conveyor. The section of the forming conveying plate away from the belt conveyor is a forming section, which is located below the forming mold of the brick press. A pressure platform is provided below the forming section, which is placed on the ground and its upper end abuts against the forming conveying plate.

[0027] Preferably, the tray is rectangular, and a positioning plate is provided on the side of the bottom of the tray. The positioning plate is in the shape of [, and the two positioning plates are mirror-imaged and arranged on both sides of the tray. The two horizontal sections of the positioning plate are respectively located at the front and rear ends of the tray, and the vertical section of the positioning plate is slidably arranged on the tray along the width direction of the tray. The length of the vertical section of the positioning plate is greater than the length of the positioning plate. A spring is provided between the vertical sections of the two positioning plates, and the spring drives the two positioning plates to translate toward the outside of the tray.

[0028] Preferably, guide bars are fixedly provided on both sides of the upper part of the flat conveying device and the forming conveying plate, and the guide bars are arranged along the length direction of the flat conveying device or the forming conveying plate, and the vertical sections of the two positioning plates on both sides of the pallet respectively abut against the two guide bars.

[0029] Preferably, the tray comprises a base, side plates and end plates, the base is in the shape of a rectangular flat plate, the positioning plate is slidably arranged on the base along the width direction of the base, the two side plates are respectively hinged to the left and right sides of the base, the two end plates are respectively hinged to the front and rear ends of the base, and torsion springs are arranged between the side plates and the end plates and the base, and the torsion springs drive the side plates or the end plates to rotate toward the inside of the base;

[0030] When the side plates and the end plates are rotated inward to the extreme positions, the angles between the side plates and the end plates and the upper surface of the base are all greater than 90°, and the end faces at both ends of any end plate are respectively in contact with the end faces of the two side plates close to the end plate.

[0031] Through the above technical solution, the beneficial effects of the present invention are:

[0032] When making bricks, they are pressed from top to bottom, and the layer density of the mixed material is dense at the top and sparse at the bottom; therefore, during firing, the expansion rate of the lower part of the brick is greater than that of the upper part, which makes the number of pores in the lower part of the high-alumina brick greater than that of the upper part, and there are more long pores connected from top to bottom, so the thermal shock resistance is lower.

[0033] In the present invention, kyanite is added, and mullite reaction begins to occur at 1300° C., resulting in volume expansion, which offsets the shrinkage of soft clay and ensures the volume stability of the product. During the calcination process, the expansion of kyanite can actively generate pores.

[0034] In the present invention, the content of kyanite in the mixed material in the tray gradually increases from bottom to top, which can balance the number of pores in the lower and upper parts of the high-aluminum bricks, and at the same time increase the pressure when making the brick blanks, so that the density of the brick blanks is increased and the pore diameter is reduced; and the multi-layer laying is not easy to have long pores; not only the strength of the high-aluminum bricks is improved, but also the thermal shock resistance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the preparation equipment of the present invention;

[0036] Figure 2 It is a structural cross-sectional view of the preparation equipment of the present invention;

[0037] Figure 3 It is a structural schematic diagram of the mixing and grinding equipment of the present invention;

[0038] Figure 4 It is a structural cross-sectional view of the mixing and grinding equipment of the present invention;

[0039] Figure 5 It is a schematic diagram of the assembly of the rotating frame, the rolling wheel and the scraper of the present invention;

[0040] Figure 6 It is a structural schematic diagram of the rotating frame of the present invention;

[0041] Figure 7 It is a structural cross-sectional view of the rotating rack of the present invention;

[0042] Figure 8 It is a structural schematic diagram of the flat-laying conveying device of the present invention;

[0043] Fig. 9It is a structural schematic diagram of the forming conveying plate of the present invention;

[0044] Fig.10 A top view of the molded conveyor plate of the present invention;

[0045] Fig.11 It is a structural schematic diagram of the tray of the present invention;

[0046] Fig.12 It is a structural cross-sectional view of the tray of the present invention;

[0047] Among them: 1-mixing drum; 2-rotating frame; 3-rolling wheel; 4-scraper; 5-material guide plate; 6-cover plate; 7-liquid guide pipe; 8-belt conveyor; 9-tray; 10-forming conveyor plate; 11-pressure platform; 12-brick press; 13-positioning plate; 14-guide bar; 901-base; 902-side plate; 903-end plate. DETAILED DESCRIPTION

[0048] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0050] Embodiment 1:

[0051] like Figure 1-Figure 12 As shown, a method for preparing a thermal shock resistant high-alumina brick comprises the following steps:

[0052] S1. preparing a conditioning agent, mixing powder, anti-wetting agent and binder uniformly and preheating to obtain a liquid conditioning agent;

[0053] S2. Mixing aggregates: Add aggregates and binders into a mixer and knead for 3 minutes to ensure that the aggregates are fully moistened to obtain mixed aggregates;

[0054] S3, preparing a mixed material, spraying the quantitative regulator in step S1 evenly in a mixing and grinding machine, mixing and grinding for 3 minutes, and obtaining a mixed material;

[0055] S4, spreading the material, spreading the mixed material obtained in step S3 onto the tray 9;

[0056] S5, spreading the material again, repeating steps S3 and S4 until all the regulators are mixed into the mixed aggregate and spread on the tray 9 from bottom to top;

[0057] S6, making brick blanks, pressing the mixed material laid flat in the tray 9 by the brick press 12 to obtain brick blanks;

[0058] S7, heat preservation and drying, heat preservation and drying the bricks in step S6 at 180° C. for 24 hours to obtain dry bricks, wherein the residual moisture of the dry bricks is ≤1.5%;

[0059] S8, calcining, placing the dry blank obtained in step S7 in a tunnel kiln for calcining, calcining at 1300-1350° C. for 4 hours, calcining at 1450-1500° C. for 4 hours, to obtain high alumina bricks.

[0060] In this embodiment, the aggregate includes corundum and homogenized high-alumina bauxite, the powder includes alumina powder, zirconium dioxide powder and kyanite powder, the binder is a phosphate binder, and the anti-wetting agent is calcium fluoride powder.

[0061] In this embodiment, the weight percentage of corundum is 40-48%, the weight percentage of homogenized high-alumina bauxite is 13.5-14%, the weight percentage of alumina powder is 26-36.5%, the weight percentage of zirconium dioxide powder is 5-7%, and the weight percentage of kyanite powder is 5%; the mass ratio of the binder in step S1 to the binder in step S2 is 3:7.

[0062] When making bricks, they are pressed from top to bottom, and the layer density of the mixed material is dense at the top and sparse at the bottom; therefore, during firing, the expansion rate of the lower part of the brick is greater than that of the upper part, which makes the number of pores in the lower part of the high-alumina brick greater than that of the upper part, and there are more long pores connected from top to bottom, so the thermal shock resistance is lower.

[0063] In the present invention, kyanite is added, and mullite reaction begins to occur at 1300° C., resulting in volume expansion, which offsets the shrinkage of soft clay and ensures the volume stability of the product. During the calcination process, the expansion of kyanite can actively generate pores.

[0064] In the present invention, the content of kyanite in the mixed material in the tray 9 gradually increases from bottom to top, which can balance the number of pores in the lower and upper parts of the high-aluminum bricks, and at the same time increase the pressure during brick making, increase the density of the bricks and reduce the pore diameter, which not only improves the strength of the high-aluminum bricks, but also improves the thermal shock resistance.

[0065] A preparation device for heat-shock-resistant high-alumina bricks, the preparation device comprises a mixing and grinding device, a brick press 12 and a tray 9, the mixing and grinding device comprises a mixing and grinding drum 1, a rotating frame 2, a grinding wheel 3 and a scraper 4, the mixing and grinding drum 1 is in the shape of a cylinder with an upper end opening, two grinding wheels 3 are rotatably arranged on both sides of the rotating frame 2, two scrapers 4 are respectively fixedly arranged at both ends of the rotating frame 2, a discharge port is arranged at the lower part of the circumferential side of the mixing and grinding drum 1, a side sealing plate is detachably arranged at the discharge port, a guide plate 5 is arranged at the lower side of the discharge port, the inner end of the guide plate 5 is connected to the discharge port, and the outer end extends obliquely downward; the mixed grinding material is conveniently introduced into the tray 9 through the guide plate 5;

[0066] The upper opening of the mixing drum 1 is sealed with a cover plate 6 , which is provided with a feed port, which is eccentrically arranged with the cover plate 6 ; the aggregate is put into the mixing drum 1 from the feed port of the cover plate 6 .

[0067] In order to spray the regulator evenly in the mixing drum 1 and make the kyanite mixed more evenly, a liquid guide groove is transversely arranged in the rotating frame 2, and the liquid guide groove is arranged along the length direction of the rotating frame 2. A plurality of spray holes are arranged on the lower side of the liquid guide groove, and the upper and lower ends of the spray holes are respectively connected to the liquid guide groove and the bottom surface of the rotating frame 2;

[0068] A liquid guide tube 7 is fixedly arranged on the upper part of the rotating frame 2. The liquid guide tube 7 is coaxially arranged with the mixing drum 1, and the lower end of the liquid guide tube 7 is connected to the liquid guide groove.

[0069] In order to realize continuous automatic production, a flattening conveying assembly is arranged between the mixing and grinding equipment and the brick press 12. The flattening conveying assembly includes a flattening conveying device and a pallet 9. The flattening conveying device is a belt conveyor 8. A section of the belt conveyor 8 close to its tail end is a flattening section. The flattening section is located below the guide plate 5 of the mixing and grinding equipment. The pallet 9 is placed on the conveyor belt of the belt conveyor 8. The belt conveyor 8 drives the pallet 9 to translate along its length direction. The pallet 9 translates back and forth when it is located in the flattening section of the belt conveyor 8.

[0070] In order to ensure the paving effect and avoid the occurrence of voids, the paving section of the belt conveyor 8 is provided with a vibration device, which causes the tray 9 to vibrate continuously when the paving section reciprocates.

[0071] In order to optimize the product structure, the paving conveying assembly also includes a forming conveying plate 10, which is flat and located at the head end of the belt conveyor 8. The upper surface of the forming conveying plate 10 is flush with the upper surface of the conveyor belt of the belt conveyor 8. The section of the forming conveying plate 10 away from the belt conveyor 8 is a forming section, which is located below the forming mold of the brick press 12. A pressure platform 11 is arranged below the forming section, and the pressure platform 11 is placed on the ground and its upper end is against the forming conveying plate 10.

[0072] The tray 9 is driven by the belt conveyor 8 to translate. The filled tray 9 is driven by the belt conveyor 8 to enter the forming conveying plate 10 , and the subsequent tray 9 drives the previous tray 9 to translate on the forming conveying plate 10 .

[0073] In order to ensure the stability of the position of the tray 9 during the translation process and avoid touching the adjacent tray 9 when pressing the bricks, the tray 9 is rectangular, and a positioning plate 13 is provided on the bottom side of the tray 9. The positioning plate 13 is in the shape of [. The two positioning plates 13 are mirror-imaged and arranged on both sides of the tray 9. The two horizontal sections of the positioning plate 13 are respectively located at the front and rear ends of the tray 9. The vertical section of the positioning plate 13 is slidably arranged on the tray 9 along the width direction of the tray 9. The length of the vertical section of the positioning plate 13 is greater than the length of the positioning plate 13. A spring is provided between the vertical sections of the two positioning plates 13, and the spring drives the two positioning plates 13 to translate toward the outside of the tray 9.

[0074] Guide bars 14 are fixedly provided on both sides of the upper part of the flat conveying device and the forming conveying plate 10 . The guide bars 14 are arranged along the length direction of the flat conveying device or the forming conveying plate 10 . The vertical sections of the two positioning plates 13 on both sides of the tray 9 respectively abut against the two guide bars 14 .

[0075] In order to ensure the pressing and forming effect and reduce material waste, the size of the tray 9 is set corresponding to the size of the forming mold. When the forming mold is pressed on the tray 9, the side plate 902 and the end plate 903 are turned outward. The tray 9 includes a base 901, a side plate 902 and an end plate 903. The base 901 is in the shape of a rectangular flat plate. The positioning plate 13 is slidably set on the base 901 along the width direction of the base 901. The two side plates 902 are respectively hinged to the left and right sides of the base 901, and the two end plates 903 are respectively hinged to the front and rear ends of the base 901. Torsion springs are arranged between the side plates 902 and the end plates 903 and the base 901, and the torsion springs drive the side plates 902 or the end plates 903 to rotate toward the inside of the base 901;

[0076] When the side panels 902 and the end panels 903 are rotated inward to the extreme positions, the angles between the side panels 902 and the end panels 903 and the upper surface of the base 901 are all greater than 90°, and the end surfaces of either end panel 903 are respectively in contact with the end surfaces of the two side panels 902 close to the end panel 903.

[0077] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing thermal shock resistant high alumina bricks, characterized in that: The following steps are involved: S1. preparing a conditioning agent, mixing powder, anti-wetting agent and binder uniformly and preheating to obtain a liquid conditioning agent; S2. Mixing aggregates: Add aggregates and binders into a mixer and knead for 3 minutes to ensure that the aggregates are fully moistened to obtain mixed aggregates; S3, preparing a mixed material, spraying the quantitative regulator in step S1 evenly in a mixing and grinding machine, mixing and grinding for 3 minutes, and obtaining a mixed material; S4, spreading the material, spreading the mixed and ground material obtained in step S3 onto the tray (9); S5, spreading the material again, repeating steps S3 and S4 until all the regulators are mixed into the mixed aggregate and spread on the tray (9) from bottom to top; S6, making brick blanks, using a brick press (12) to press the mixed material spread in the tray (9) into shape to obtain brick blanks; S7, heat preservation and drying, heat preservation and drying the bricks in step S6 at 180° C. for 24 hours to obtain dry bricks, wherein the residual moisture of the dry bricks is ≤1.5%; S8, calcining, placing the dry blank obtained in step S7 in a tunnel kiln for calcining, calcining at 1300-1350° C. for 4 hours, calcining at 1450-1500° C. for 4 hours, to obtain high alumina bricks.

2. The method for preparing a thermal shock resistant high alumina brick according to claim 1, characterized in that: The aggregate comprises corundum and homogenized high-alumina bauxite, the powder comprises alumina micropowder, zirconium dioxide micropowder and kyanite micropowder, the binder is a phosphate binder, and the anti-wetting agent is calcium fluoride micropowder.

3. A preparation device for heat-shock-resistant high-alumina bricks, the preparation device comprising a mixing and grinding device, a brick press (12) and a tray (9), the mixing and grinding device comprising a mixing and grinding drum (1), a rotating frame (2), a grinding wheel (3) and a scraper (4), the mixing and grinding drum (1) is cylindrical with an open upper end, the two grinding wheels (3) are rotatably arranged on both sides of the rotating frame (2), and the two scrapers (4) are fixedly arranged at both ends of the rotating frame (2), characterized in that: The mixing and grinding drum (1) is provided with a discharge port at the lower part of the circumferential side surface, and a side sealing plate is detachably provided at the discharge port. A guide plate (5) is provided at the lower side of the discharge port, and the inner end of the guide plate (5) is connected to the discharge port, and the outer end thereof extends obliquely downward; The upper opening of the mixing and grinding drum (1) is sealed with a cover plate (6), and the cover plate (6) is provided with a feed port, and the feed port and the cover plate (6) are eccentrically arranged.

4. The preparation equipment of thermal shock resistant high alumina brick according to claim 3, characterized in that: A liquid guide groove is transversely arranged in the rotating frame (2), and the liquid guide groove is arranged along the length direction of the rotating frame (2). A plurality of spray holes are arranged on the lower side of the liquid guide groove, and the upper and lower ends of the spray holes are respectively connected to the liquid guide groove and the bottom surface of the rotating frame (2); A liquid guide tube (7) is fixedly arranged on the upper part of the rotating frame (2); the liquid guide tube (7) is coaxially arranged with the mixing drum (1); and the lower end of the liquid guide tube (7) is connected to the liquid guide groove.

5. The preparation equipment of thermal shock resistant high alumina brick according to claim 3, characterized in that: A paving conveying assembly is arranged between the mixing and grinding equipment and the brick press (12), and the paving conveying assembly comprises a paving conveying device and a pallet (9). The paving conveying device is a belt conveyor (8), and a section of the belt conveyor (8) close to its tail end is a paving section, and the paving section is located below the guide plate (5) of the mixing and grinding equipment. The pallet (9) is placed on the conveyor belt of the belt conveyor (8), and the belt conveyor (8) drives the pallet (9) to move in a translational direction along its length. When the pallet (9) is located in the paving section of the belt conveyor (8), it moves back and forth in a translational manner.

6. The equipment for preparing thermal shock resistant high alumina bricks according to claim 5, characterized in that: The flattening section of the belt conveyor (8) is provided with a vibration device, and the vibration device causes the tray (9) to vibrate continuously when the flattening section reciprocates.

7. The equipment for preparing thermal shock resistant high alumina bricks according to claim 5, characterized in that: The paving conveying assembly also includes a forming conveying plate (10), which is in the shape of a flat plate and is located at the head end of the belt conveyor (8). The upper surface of the forming conveying plate (10) is flush with the upper surface of the conveyor belt of the belt conveyor (8). A section of the forming conveying plate (10) away from the belt conveyor (8) is a forming section, which is located below the forming mold of the brick press (12). A pressure platform (11) is provided below the forming section, and the pressure platform (11) is placed on the ground with its upper end abutting against the forming conveying plate (10).

8. The equipment for preparing thermal shock resistant high alumina bricks according to claim 7, characterized in that: The tray (9) is rectangular, and a positioning plate (13) is arranged on the side of the bottom of the tray (9). The positioning plate (13) is in the shape of [, and the two positioning plates (13) are arranged on both sides of the tray (9) in a mirror image. The two horizontal sections of the positioning plate (13) are respectively located at the front and rear ends of the tray (9), and the vertical section of the positioning plate (13) is slidably arranged on the tray (9) along the width direction of the tray (9). The length of the vertical section of the positioning plate (13) is greater than the length of the positioning plate (13). A spring is arranged between the vertical sections of the two positioning plates (13), and the spring drives the two positioning plates (13) to translate toward the outside of the tray (9).

9. The equipment for preparing thermal shock resistant high alumina bricks according to claim 8, characterized in that: Guide bars (14) are fixedly arranged on both sides of the upper part of the flattening conveying device and the forming conveying plate (10), and the guide bars (14) are arranged along the length direction of the flattening conveying device or the forming conveying plate (10), and the vertical sections of the two positioning plates (13) on both sides of the tray (9) respectively abut against the two guide bars (14).

10. The equipment for preparing thermal shock resistant high alumina bricks according to claim 8, characterized in that: The tray (9) comprises a base (901), a side plate (902) and an end plate (903); the base (901) is in the shape of a rectangular flat plate; the positioning plate (13) is slidably arranged on the base (901) along the width direction of the base (901); the two side plates (902) are respectively hinged to the left and right sides of the base (901); the two end plates (903) are respectively hinged to the front and rear ends of the base (901); torsion springs are arranged between the side plates (902) and the end plates (903) and the base (901); the torsion springs drive the side plates (902) or the end plates (903) to rotate toward the inside of the base (901); When the side plates (902) and the end plates (903) are rotated inward to the extreme positions, the angles between the side plates (902) and the end plates (903) and the upper surface of the base (901) are greater than 90°, and the end surfaces at both ends of any end plate (903) are respectively in contact with the end surfaces of the two side plates (902) close to the end plates (903).

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