A method and apparatus for preparing unfired magnesia bricks

Abstract

This invention relates to the field of magnesia brick preparation technology, and in particular to a method for preparing unfired magnesia bricks, comprising the following steps: S1: using magnesia sand as the main raw material, adding additives and binders for mixing; S2: using a preparation device to produce magnesia bricks; S3: drying the magnesia bricks formed in S2 at a temperature of 200℃ for 8-12 hours. Compared with existing production technologies, this invention significantly saves time, and experiments have shown that the finished product of this invention has superior performance indicators compared to unfired magnesia bricks produced by existing processes. The room temperature compressive strength reaches over 90 MPa, and the porosity can be effectively controlled at around 10%. All chemical analysis indicators meet or even exceed the requirements for fired magnesia bricks.

Description

Technical Field

[0001] This invention relates to the field of magnesia brick preparation technology, and in particular to a method and apparatus for preparing unfired magnesia bricks. Background Technology

[0002] The production process of magnesia bricks is as follows: Magnesia sand raw materials are crushed into granules and powders, mixed in a certain proportion, and then a binder is added to form mud. After molding and firing, magnesia bricks are produced. The firing temperature of ordinary magnesia bricks is generally 1500-1650℃, while the firing temperature of high-purity magnesia bricks is as high as 1700-1900℃. Due to the extremely high temperature and long holding time during firing, scorched bricks are very easy to be produced during the production process. Scorched bricks have a dark color, are bent and deformed, and have cracks of varying degrees, which greatly affects the appearance and quality of the product.

[0003] To address the aforementioned issues, existing technologies have developed unfired magnesia bricks. The raw material requirements and processing procedures are essentially the same as those for current magnesia products. However, the binder used is water glass with a modulus of 2.1-2.2 and a specific gravity of 1.48-1.51, added at a rate of 6-8%. The clay moisture content is 3.0-3.5%. After the brick blanks are formed, they are first air-dried for approximately 8 hours, and then dried in a dryer until the moisture content is less than 2.3%. Due to the high sensitivity of magnesia bricks during drying, cracks are easily generated. Therefore, the early and mid-stage heating of the magnesia brick blanks is relatively gradual, allowing the blanks to heat slowly. This results in a drying time of at least 48 hours for magnesia brick blanks in existing technologies, leading to a long production cycle for magnesia bricks. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method and apparatus for preparing non-fired magnesia bricks.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Design a method for preparing non-fired magnesia bricks, including the following steps:

[0007] S1: Magnesia sand is the main raw material, with additives and binders added and then mixed.

[0008] S2: Magnesia bricks are made using a preparation device;

[0009] S3: Dry the magnesium bricks formed in S2 at a temperature of 200℃ for 8-12 hours.

[0010] Furthermore, the raw materials mentioned in S1 are in the following proportions by mass: 1000 parts magnesia, 3 parts additives, and 30 parts binder.

[0011] Furthermore, the additive is iron oxide red, and the binder is phenolic resin.

[0012] An apparatus for preparing non-fired magnesia bricks includes a base, a first ring gear fixedly connected to the top of the base, a planetary carrier rotatably mounted on the first ring gear, a plurality of planetary shafts rotatably mounted on the planetary carrier, planetary gears fixedly connected to the bottom ends of the planetary shafts, the planetary gears matching the first ring gear, a second ring gear rotatably mounted on the bottom surface of the planetary carrier, the second ring gear matching the planetary gear, a tank fixedly connected to the base, a stirring shaft rotatably mounted inside the tank, a second friction wheel fixedly connected to the stirring shaft, a motor fixedly connected to the base, a first friction wheel fixedly connected to the output end of the motor, one side of the first friction wheel abutting against the second friction wheel, and the other side abutting against the inner ring of the second ring gear, a plurality of forming mechanisms provided on the planetary carrier, and a tubular conveyor provided on the tank to transport the material inside the tank to the forming mechanisms.

[0013] Further, the molding mechanism includes a bracket, a mounting plate, an upper pressure block, a lower pressure block, and a mold shell. A sliding groove is fixedly connected to the top of the bracket. A first rack and a second rack are fixedly connected parallel to each other on the mounting plate. The first rack and the second rack are slidably fitted within the sliding groove. A planetary shaft is rotatably mounted in the middle of the sliding groove. A first incomplete gear is fixedly connected to the top of the planetary shaft. The first incomplete gear matches the first rack and the second rack. A first gear and a second gear are rotatably mounted on the sliding groove. The first gear and the second gear match the first incomplete gear. A first gear is fixedly connected to... A first pulley, a second pulley fixedly connected to the second gear, a nut seat rotatably mounted on the mounting plate, a third pulley fixedly connected to the nut seat, belts fitted onto the first pulley, second pulley, and third pulley, a reciprocating screw screwed into the nut seat, the reciprocating screw screw fixedly connected to the upper pressure block, a guide rod fixedly connected to the upper pressure block, the guide rod slidably fitted onto the mounting block, the upper pressure block and lower pressure block slidably fitted into the mold shell, a baffle fixedly connected to the bracket, the baffle having a lifting structure to allow the mold shell to move vertically, and a vibration structure on the baffle to support the lower pressure block.

[0014] Furthermore, the support structure includes a sliding rod and a return spring. A through hole is provided on the mold shell. One end of the sliding rod is fixed to the baffle plate, and the other end is slidably fitted into the through hole. The return spring is sleeved on the sliding rod. A rotating shaft is rotatably mounted on the bottom of the bracket. A first bevel gear is fixed to one end of the rotating shaft, and a second incomplete gear is fixed to the other end. A second bevel gear is fixed to the planetary shaft. The first bevel gear matches the second bevel gear. A third rack is fixed to the mold shell, and the second incomplete gear matches the third rack.

[0015] Furthermore, the vibration-initiating structure includes an end-face gear, a short shaft, a rotating disk, a slider, a U-shaped frame, a column, and two first tension springs. A groove is formed on the bottom surface of the lower pressure block, and the top of the column is slidably fitted into the groove. The bottom of the column is slidably fitted into the baffle. The two first tension springs are symmetrically arranged on both sides of the column, with one end fixed to the column and the other end fixed to the lower pressure block. The U-shaped frame is fixed to the column. A short shaft is rotatably mounted on the baffle. The end-face gear is fixed to the bottom of the short shaft and matches the second incomplete gear. The top of the short shaft is fixed to the rotating disk, and the slider is fixed to the upper surface of the rotating disk, slidably fitted into the U-shaped frame.

[0016] This invention proposes a method and apparatus for preparing unfired magnesia bricks. The advantages are as follows: Compared to existing unfired magnesia brick production processes, this invention significantly reduces production time. The semi-finished product, after being processed by a press, is directly dried in a drying kiln at 200°C for 8-12 hours. Compared to existing production technologies, this invention greatly saves time. Furthermore, experiments show that the finished product of this invention outperforms unfired magnesia bricks produced by existing processes in all aspects. The room temperature compressive strength reaches over 90 MPa, and the porosity can be effectively controlled at around 10%. All chemical analysis indicators meet or even exceed the requirements for fired magnesia bricks. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a non-fired magnesia brick preparation device proposed in this invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of the tank in the apparatus for preparing non-fired magnesia bricks according to the present invention.

[0019] Figure 3 This is a schematic diagram of the bottom structure of the base of the preparation device for non-fired magnesia bricks proposed in this invention.

[0020] Figure 4 This is a schematic diagram of the molding mechanism of a non-fired magnesia brick preparation device proposed in this invention.

[0021] Figure 5 This is a top view of the molding mechanism of a non-fired magnesia brick preparation apparatus proposed in this invention.

[0022] Figure 6 This invention provides an apparatus for preparing unfired magnesia bricks. Figure 5 Sectional view along the AA direction. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Example 1

[0025] A method for preparing unfired magnesia bricks involves using refired magnesia or slag as the main raw material, adding some iron oxide red and phenolic resin, and then using a preparation device to produce magnesia bricks, followed by drying at 200℃ for 8-12 hours.

[0026] The mass ratio of magnesia, iron oxide red, and phenolic resin is 1000:3:30.

[0027] Taking 1 ton of magnesia as an example, it requires 3 kg of iron oxide red and 30 kg of phenolic resin.

[0028] For the room temperature compressive strength test of unburned magnesia bricks, a cube with a length, width, and height of 50 mm ± 0.5 mm is used. A load is applied at a constant pressure rate of 2 MPa / s until the sample breaks. The maximum load is recorded. The room temperature compressive strength is calculated based on the maximum load and the average cross-sectional area under pressure of the sample. The test is performed 4 times and the average value is taken.

[0029] To determine the porosity and bulk density of unfired magnesia bricks, the mass of the rectangular sample was weighed, and the volume was measured by hydrostatic weighing. The apparent porosity and bulk density were calculated. The test was performed four times, and the average value was taken.

[0030] The thermal shock resistance of unfired magnesia bricks was tested in an environment at room temperature (25°C) using flowing water as the cooling medium.

[0031] The furnace temperature was maintained at 1100℃. Using the original brick as a sample, after being subjected to rapid cooling and heating, the number of times the damaged area of ​​the heated end face was 80% of the original brick area was measured. The average value of the four tests was taken to determine the thermal shock resistance of the unfired magnesia brick.

[0032] The load softening temperature of unburned magnesia bricks was determined by using a cube with a length, width, and height of 50 mm. After drying to constant weight, the sample was continuously and uniformly heated at a heating rate of 5 °C / min until the end of the test. The temperature at which the sample collapsed was recorded. The test was conducted 4 times under uniform environmental conditions, and the average value was taken.

[0033] The chemical properties of the raw materials are shown in the table below:

[0034] raw material SiO2 Fe2O3 Al2O3 CaO MgO severe fever 1.09 0.69 0.14 1.55 96.52 severe fever 0.97 0.51 0.1 1.54 96.87 Skin Sand 3.01 0.95 0.38 2.84 92.8 Skin Sand 2.99 0.97 0.41 2.86 93.1

[0035] The chemical analysis data of the magnesium brick mortar are shown in the table below:

[0036] SiO2 Fe2O3 Al2O3 CaO MgO mud 3.23 1.29 0.74 2.66 92.06 mud 3.05 1.48 0.62 2.48 92.34 mud 3.34 1.52 0.72 2.87 91.53

[0037] The physical analysis data of the finished magnesia bricks are shown in the table below:

[0038]

[0039] Example 2

[0040] like Figure 1-6 A device for preparing non-fired magnesia bricks includes a base 1, a first ring gear 2 fixedly connected to the top of the base 1, a planetary carrier 3 rotatably mounted on the first ring gear 2, a plurality of planetary shafts 4 rotatably mounted on the planetary carrier 3, a planetary gear 5 fixedly connected to the bottom end of the planetary shafts 4, the planetary gear 5 matching the first ring gear 2, a second ring gear 6 rotatably mounted on the bottom surface of the planetary carrier 3, the second ring gear 6 matching the planetary gear 5, a tank 9 fixedly connected to the base 1, a stirring shaft 10 rotatably mounted inside the tank 9, a second friction wheel 11 fixedly connected to the stirring shaft 10, a motor 8 fixedly connected to the base 1, a first friction wheel 7 fixedly connected to the output end of the motor 8, one side of the first friction wheel 7 abutting against the second friction wheel 11, and the other side abutting against the inner ring of the second ring gear 6, a plurality of forming mechanisms are provided on the planetary carrier 3, and a tubular conveyor 12 is provided on the tank 1 to transport the material in the tank 9 to the forming mechanism.

[0041] When this device is in operation, the mixed material is first fed into the tank 9. The bottom of the tank 9 is fixed to the base 1 by a column. Then, the motor 8 is started. The motor 8 drives the first friction wheel 7 to rotate. The first friction wheel 7 drives the second friction wheel 11 to rotate. The rotation of the second friction wheel 11 drives the stirring shaft 10 to rotate. The rotation of the stirring shaft 10 will stir the material in the tank 9 and improve the uniformity of the material. When making bricks, the tubular conveyor 12 transports the material in the tank 9 to the molding mechanism for brick making.

[0042] When the first friction wheel 7 rotates, it also drives the second ring gear 6 to rotate. The second ring gear 6 drives the planetary gear 5 to rotate, and the planetary gear 5 meshes with the first ring gear 2. The first ring gear 2 is in a fixed state. Therefore, when the second ring gear 6 rotates, the planetary gear 5 revolves while rotating on its own axis.

[0043] The revolution of planetary gear 5 will drive the planetary carrier 3 to rotate. Multiple forming mechanisms are installed on the planetary carrier 3. During the rotation of the planetary carrier 3, the forming mechanism will rotate, causing each forming mechanism to periodically move to the discharge port of the tubular conveyor 12. At this time, the tubular conveyor 12 will send the material into the forming mechanism.

[0044] The molding mechanism includes a bracket 13, a mounting plate 24, an upper pressure block 39, a lower pressure block 45, and a mold shell 14. A slide groove 23 is fixedly connected to the top of the bracket 13. A first rack 25 and a second rack 26 are fixedly connected parallel to each other on the mounting plate 24. The first rack 25 and the second rack 26 are slidably fitted within the slide groove 23. A planetary shaft 4 is rotatably mounted in the middle of the slide groove 23. A first incomplete gear 31 is fixedly connected to the top of the planetary shaft 4. The first incomplete gear 31 matches the first rack 25 and the second rack 26. A first gear 27 and a second gear 29 are rotatably mounted on the slide groove 23. The first gear 27 and the second gear 29 match the first incomplete gear 31. A first pulley 28 is fixedly connected to the first gear 27. A second pulley 30 is fixedly connected to the second gear 29. A nut seat 38 is rotatably mounted on the mounting plate 24. A third pulley 37 is fixedly connected to the nut seat 38. A belt 40 is fitted onto the first pulley 28, the second pulley 30, and the third pulley 37. A reciprocating screw 36 is screwed into the nut seat 38. The reciprocating screw 36 is fixedly connected to the upper pressure block 39. A guide rod 34 is fixedly connected to the upper pressure block 39. The guide rod 34 is slidably fitted onto the mounting block 24. The upper pressure block 39 and the lower pressure block 45 are slidably fitted into the mold shell 14. A baffle 52 is fixedly connected to the bracket 13. The baffle 52 is provided with a lifting structure to allow the mold shell 14 to move vertically. The baffle 52 is provided with a vibration structure to support the lower pressure block 45.

[0045] The planetary gear 5 rotates, driving the planetary shaft 4 to rotate. The rotation of the planetary shaft 4 drives the first incomplete gear 31 to rotate. The rotation of the first incomplete gear 31 will intermittently drive the first rack 25 and the second rack 26 to slide in the slide groove 23. The first rack 25 and the second rack 26 will drive the mounting plate 24 to move synchronously. The mounting plate 24 drives the upper pressure block 39 to make linear reciprocating motion in the horizontal direction, thereby aligning or misaligning the upper pressure block 39 with the mold shell 14.

[0046] During the rotation of the first incomplete gear 31, it will also intermittently drive the first gear 27 and the second gear 29 to rotate. The rotation of the first gear 27 and the second gear 29 will drive the first pulley 28 and the second pulley 30 to rotate. The first pulley 28 and the second pulley 30, as driving wheels, will drive the belt 40 to rotate. After the belt 40 rotates, it will drive the third pulley 37, which is the driven wheel, to rotate. The rotation of the third pulley 37 will drive the nut seat 38 to rotate. When the nut seat 38 rotates, the reciprocating screw 36 will reciprocate in the vertical direction, thereby causing the reciprocating screw 36 to drive the upper pressure block 39 to move up and down.

[0047] The working process of the molding mechanism is as follows:

[0048] like Figure 4 As shown, the mold shell 14 is mounted on the baffle 52 in a height-adjustable manner via a support structure. When the mold shell 14 moves to the loading station, the tubular conveyor 12 transports the material into the mold shell 14. At this time, for the first incomplete gear 31:

[0049] In the first step, the first incomplete gear 31 meshes with the first gear 27, and the first incomplete gear 31 drives the first gear 27 to rotate. The rotation of the first gear 27 drives the first pulley 28 to rotate. The first pulley 28 drives the third pulley 37 to rotate through the belt 40. The third pulley 37 drives the nut seat 38 to rotate. The nut seat 38 drives the reciprocating screw 36 to move down to the lowest point. The reciprocating screw 36 drives the upper pressure block 39 to move down. The upper pressure block 39 presses the material in the mold shell 14 to form magnesium bricks.

[0050] The second step, as Figure 6 As shown, the support structure drives the mold shell 14 to descend, so that the top of the mold shell 14 is lower than the magnesium brick. Since the upper pressure block 39 is slidably fitted with a stop rod 41, and the stop rod 41 is provided with a second tension spring 42, the second tension spring 42 applies a downward elastic force to the stop rod 41. After the top of the mold shell 14 is lower than the magnesium brick, the stop rod 41 moves down under the elastic force of the second tension spring 42, and the bottom of the stop rod 41 will be lower than the upper surface of the magnesium brick.

[0051] In the third step, the first incomplete gear 31 separates from the first gear 27, and the first incomplete gear 31 meshes with the first rack 25. Driven by the first incomplete gear 31, the first rack 25 moves away from the tank body 9. The first rack 25 drives the upper pressure block 39 away from the tank body 9, and the stop rod 41 moves away from the tank body 9. Since the magnesium brick is on the forward trajectory of the stop rod 41, the magnesium brick will be pushed away by the stop rod 41, and the magnesium brick will be fed out.

[0052] In the fourth step, the support structure drives the mold shell 14 to move upward and reset. The first incomplete gear 31 separates from the first rack 25 and meshes with the second gear 29. The second gear 29 drives the second pulley 30 to rotate. The second pulley 30 drives the third pulley 37 to rotate through the belt 40. The third pulley 37 drives the nut seat 38 to rotate. The nut seat 38 drives the reciprocating screw 36 to move upward to the highest point, and the upper pressure block 39 also moves upward to the highest point.

[0053] In the fifth step, the first incomplete gear 31 separates from the second gear 29, and the first incomplete gear 31 meshes with the second rack 26. Driven by the first incomplete gear 31, the second rack 26 moves closer to the tank body 9 and drives the upper pressure block 39 to realign with the mold shell 14.

[0054] Step 6: Repeat steps 1 through 5 above to continuously produce magnesia bricks.

[0055] The support structure includes a slide rod 16 and a return spring 17. A through hole 15 is provided on the mold shell 14. One end of the slide rod 16 is fixed to the baffle 52, and the other end is slidably fitted in the through hole 15. The return spring 17 is sleeved on the slide rod 16. A rotating shaft 20 is rotatably mounted on the bottom of the bracket 13. A first bevel gear 21 is fixed to one end of the rotating shaft 20, and a second incomplete gear 19 is fixed to the other end. A second bevel gear 22 is fixed to the planetary shaft 4. The first bevel gear 21 matches the second bevel gear 22. A third rack 18 is fixed to the mold shell 14. The second incomplete gear 19 matches the third rack 18.

[0056] When the planetary shaft 4 rotates, it drives the second bevel gear 22 to rotate. The rotation of the second bevel gear 22 drives the first bevel gear 21 to rotate. The first bevel gear 21 drives the rotating shaft 20 to rotate. The rotating shaft 20 drives the second incomplete gear 19 to rotate. When the second incomplete gear 19 meshes with the third rack 18, it drives the third rack 18 to move downward, thereby causing the third rack 18 to drive the mold shell 14 to move downward. When the second incomplete gear 19 separates from the third rack 18, the mold shell 14 is reset under the elastic force of the return spring 17.

[0057] During the operation of the above-mentioned forming mechanism, the second incomplete gear 19 and the third rack 18 will only mesh when the first incomplete gear 31 works to the second step.

[0058] The vibration-initiating structure includes an end face gear 50, a short shaft 51, a rotating disk 49, a slider 48, a loop frame 47, a column 44, and two first tension springs 46. The bottom surface of the lower pressure block 45 has a groove 43. The top end of the column 44 is slidably fitted in the groove 43, and the bottom end of the column 44 is slidably fitted on the baffle 52. The two first tension springs 46 are symmetrically arranged on both sides of the column 44. One end of the first tension spring 46 is fixed to the column 44, and the other end is fixed to the lower pressure block 45. The loop frame 47 is fixed to the column 44. The short shaft 51 is rotatably mounted on the baffle 52. The end face gear 50 is fixed to the bottom end of the short shaft 51. The end face gear 50 is matched with the second incomplete gear 19. The top end of the short shaft 51 is fixed to the rotating disk 49. The slider 48 is fixed to the upper surface of the rotating disk 49 and is slidably fitted in the loop frame 47.

[0059] When the second incomplete gear 19 meshes with the end face gear 50, it drives the end face gear 50 to rotate. The end face gear 50 drives the short shaft 51 to rotate, and the short shaft 51 drives the rotating disk 49 to rotate. The rotating disk 49 drives the slider 48 to rotate, and the slider 48 drives the loop frame 47 to move in a straight line in the horizontal direction. When the second incomplete gear 19 separates from the end face gear 50, the loop frame 47 moves to the maximum distance in the horizontal direction. The loop frame 47 drives the column 44 to move to the maximum distance. Then, under the elastic force of the first tension spring 46, the column 44 moves in the opposite direction and resets. During the reset process, the top of the column 44 collides with the inner wall of the groove 43, thereby generating an impact force on the lower pressure block 45. This impact force will cause the lower pressure block 45 and the mold shell 14 to vibrate, thereby causing the material in the mold shell 14 to be vibrated to prevent uneven material thickness on the lower pressure block 45.

[0060] During the process of the tubular conveyor 12 transporting materials to the mold shell 14, the second incomplete gear 19 meshes with the end face gear 50.

[0061] Working principle:

[0062] When this device is in operation, the mixed material is first fed into the tank 9. The bottom of the tank 9 is fixed to the base 1 by a column. Then, the motor 8 is started. The motor 8 drives the first friction wheel 7 to rotate. The first friction wheel 7 drives the second friction wheel 11 to rotate. The rotation of the second friction wheel 11 drives the stirring shaft 10 to rotate. The rotation of the stirring shaft 10 will stir the material in the tank 9 and improve the uniformity of the material. When making bricks, the tubular conveyor 12 transports the material in the tank 9 to the molding mechanism for brick making.

[0063] When the first friction wheel 7 rotates, it also drives the second ring gear 6 to rotate. The second ring gear 6 drives the planetary gear 5 to rotate, and the planetary gear 5 meshes with the first ring gear 2. The first ring gear 2 is in a fixed state. Therefore, when the second ring gear 6 rotates, the planetary gear 5 revolves while rotating on its own axis.

[0064] The revolution of planetary gear 5 will drive the planetary carrier 3 to rotate. Multiple forming mechanisms are installed on the planetary carrier 3. During the rotation of the planetary carrier 3, the forming mechanism will rotate, causing each forming mechanism to periodically move to the discharge port of the tubular conveyor 12. At this time, the tubular conveyor 12 will send the material into the mold shell 14 of the forming mechanism.

[0065] When the planetary shaft 4 rotates, it drives the second bevel gear 22 to rotate. The rotation of the second bevel gear 22 drives the first bevel gear 21 to rotate. The first bevel gear 21 drives the rotating shaft 20 to rotate. The rotating shaft 20 drives the second incomplete gear 19 to rotate. When the second incomplete gear 19 meshes with the third rack 18, it drives the third rack 18 to move downward, thereby causing the third rack 18 to drive the mold shell 14 to move downward. When the second incomplete gear 19 separates from the third rack 18, the mold shell 14 is reset under the elastic force of the return spring 17.

[0066] When the second incomplete gear 19 meshes with the end face gear 50, it drives the end face gear 50 to rotate. The end face gear 50 drives the short shaft 51 to rotate, and the short shaft 51 drives the rotating disk 49 to rotate. The rotating disk 49 drives the slider 48 to rotate, and the slider 48 drives the loop frame 47 to move in a straight line in the horizontal direction. When the second incomplete gear 19 separates from the end face gear 50, the loop frame 47 moves to the maximum distance in the horizontal direction. The loop frame 47 drives the column 44 to move to the maximum distance. Then, under the elastic force of the first tension spring 46, the column 44 moves in the opposite direction and resets. During the reset process, the top of the column 44 collides with the inner wall of the groove 43, thereby generating an impact force on the lower pressure block 45. This impact force will cause the lower pressure block 45 and the mold shell 14 to vibrate, thereby causing the material in the mold shell 14 to be vibrated to prevent uneven material thickness on the lower pressure block 45.

[0067] The working process of the molding mechanism is as follows:

[0068] like Figure 4 As shown, the mold shell 14 is mounted on the baffle 52 in a height-adjustable manner via a support structure. When the mold shell 14 moves to the loading station, the tubular conveyor 12 transports the material into the mold shell 14.

[0069] In the first step, the first incomplete gear 31 meshes with the first gear 27, and the first incomplete gear 31 drives the first gear 27 to rotate. The rotation of the first gear 27 drives the first pulley 28 to rotate. The first pulley 28 drives the third pulley 37 to rotate through the belt 40. The third pulley 37 drives the nut seat 38 to rotate. The nut seat 38 drives the reciprocating screw 36 to move down to the lowest point. The reciprocating screw 36 drives the upper pressure block 39 to move down. The upper pressure block 39 presses the material in the mold shell 14 to form magnesium bricks.

[0070] The second step, as Figure 6 As shown, the support structure drives the mold shell 14 to descend, so that the top of the mold shell 14 is lower than the magnesium brick. Since the upper pressure block 39 is slidably fitted with a stop rod 41, and the stop rod 41 is provided with a second tension spring 42, the second tension spring 42 applies a downward elastic force to the stop rod 41. After the top of the mold shell 14 is lower than the magnesium brick, the stop rod 41 moves down under the elastic force of the second tension spring 42, and the bottom of the stop rod 41 will be lower than the upper surface of the magnesium brick.

[0071] In the third step, the first incomplete gear 31 separates from the first gear 27, and the first incomplete gear 31 meshes with the first rack 25. Driven by the first incomplete gear 31, the first rack 25 moves away from the tank body 9. The first rack 25 drives the upper pressure block 39 away from the tank body 9, and the stop rod 41 moves away from the tank body 9. Since the magnesium brick is on the forward trajectory of the stop rod 41, the magnesium brick will be pushed away by the stop rod 41, and the magnesium brick will be fed out.

[0072] In the fourth step, the support structure drives the mold shell 14 to move upward and reset. The first incomplete gear 31 separates from the first rack 25 and meshes with the second gear 29. The second gear 29 drives the second pulley 30 to rotate. The second pulley 30 drives the third pulley 37 to rotate through the belt 40. The third pulley 37 drives the nut seat 38 to rotate. The nut seat 38 drives the reciprocating screw 36 to move upward to the highest point, and the upper pressure block 39 also moves upward to the highest point.

[0073] In the fifth step, the first incomplete gear 31 separates from the second gear 29, and the first incomplete gear 31 meshes with the second rack 26. Driven by the first incomplete gear 31, the second rack 26 moves closer to the tank body 9 and drives the upper pressure block 39 to realign with the mold shell 14.

[0074] Step 6: Repeat steps 1 through 5 above to continuously produce magnesia bricks.

[0075] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing unfired magnesia bricks, characterized in that, Includes the following steps: S1: Magnesia sand is the main raw material, with additives and binders added and then mixed. S2: Magnesia bricks are made using a preparation device, which includes a base (1). A first ring gear (2) is fixedly connected to the top of the base (1). A planetary carrier (3) is rotatably mounted on the first ring gear (2). Multiple planetary shafts (4) are rotatably mounted on the planetary carrier (3). A planetary gear (5) is fixedly connected to the bottom end of the planetary shaft (4). The planetary gear (5) matches the first ring gear (2). A second ring gear (6) is rotatably mounted on the bottom surface of the planetary carrier (3). The second ring gear (6) matches the planetary gear (5). The base (1) A tank (9) is fixedly connected to the base (1), and a stirring shaft (10) is rotatably installed inside the tank (9). A second friction wheel (11) is fixedly connected to the stirring shaft (10). A motor (8) is fixedly connected to the base (1), and a first friction wheel (7) is fixedly connected to the output end of the motor (8). One side of the first friction wheel (7) abuts against the second friction wheel (11), and the other side abuts against the inner ring of the second ring gear (6). Multiple forming mechanisms are provided on the planetary carrier (3), and a tubular conveyor (12) is provided on the tank (9) to transport the material in the tank (9) to the forming mechanism. The molding mechanism includes a bracket (13), a mounting plate (24), an upper pressure block (39), a lower pressure block (45), and a mold shell (14). A slide groove (23) is fixedly connected to the top of the bracket (13). A first rack (25) and a second rack (26) are fixedly connected in parallel on the mounting plate (24). The first rack (25) and the second rack (26) are slidably engaged in the slide groove (23). A planetary shaft (4) is rotatably installed in the middle of the slide groove (23). A first incomplete gear (31) is fixedly connected to the top of the planetary shaft (4). The first incomplete gear (31) matches the first rack (25) and the second rack (26). A first gear (27) and a second gear (29) are rotatably installed on the slide groove (23). The first gear (27) and the second gear (29) match the first incomplete gear (31). A first pulley (2) is fixedly connected to the first gear (27). 8) A second pulley (30) is fixedly connected to the second gear (29). A nut seat (38) is rotatably mounted on the mounting plate (24). A third pulley (37) is fixedly connected to the nut seat (38). A belt (40) is fitted onto the first pulley (28), the second pulley (30), and the third pulley (37). A reciprocating screw (36) is screwed into the nut seat (38). The reciprocating screw (36) is fixedly connected to the upper pressure block (39). A guide rod (34) is fixedly connected to the upper pressure block (39), and the guide rod (34) is slidably fitted on the mounting plate (24). The upper pressure block (39) and the lower pressure block (45) are slidably fitted inside the mold shell (14). A baffle (52) is fixedly connected to the bracket (13). The baffle (52) is provided with a lifting structure to allow the mold shell (14) to move vertically. The baffle (52) is provided with a vibration structure to support the lower pressure block (45). S3: Dry the magnesium bricks formed in S2 at a temperature of 200℃ for 8-12 hours.

2. The method for preparing unfired magnesia bricks according to claim 1, characterized in that, The raw materials mentioned in S1 are in the following proportions by weight: 1000 parts magnesia, 3 parts additives, and 30 parts binder.

3. The method for preparing unfired magnesia bricks according to claim 2, characterized in that, The additive is iron oxide red, and the binder is phenolic resin.

4. The method for preparing unfired magnesia bricks according to claim 1, characterized in that, The support structure includes a slide rod (16) and a return spring (17). A through hole (15) is provided on the mold shell (14). One end of the slide rod (16) is fixed to the baffle (52), and the other end is slidably fitted in the through hole (15). The return spring (17) is sleeved on the slide rod (16). A rotating shaft (20) is rotatably installed at the bottom of the bracket (13). One end of the rotating shaft (20) is fixed to a first bevel gear (21), and the other end is fixed to a second incomplete gear (19). A second bevel gear (22) is fixed to the planetary shaft (4). The first bevel gear (21) matches the second bevel gear (22). A third rack (18) is fixed to the mold shell (14). The second incomplete gear (19) matches the third rack (18).

5. The method for preparing unfired magnesia bricks according to claim 4, characterized in that, The vibration-inducing structure includes an end face gear (50), a short shaft (51), a rotating disk (49), a slider (48), a loop frame (47), a column (44), and two first tension springs (46). The bottom surface of the lower pressure block (45) has a groove (43). The top end of the column (44) is slidably fitted into the groove (43), and the bottom end of the column (44) is slidably fitted onto the baffle (52). The two first tension springs (46) are symmetrically arranged on both sides of the column (44), and one end of the first tension spring (46) is fixed to the column (44). The other end is fixed to the lower pressure block (45), the loop frame (47) is fixed to the column (44), the baffle (52) is rotatably mounted with a short shaft (51), the end face gear (50) is fixed to the bottom end of the short shaft (51), the end face gear (50) matches the second incomplete gear (19), the top end of the short shaft (51) is fixed to the rotating disk (49), the slider (48) is fixed to the upper surface of the rotating disk (49), and the slider (48) is slidably fitted in the loop frame (47).

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