3D printing baking-free brick and raw material mixing device

Abstract

The invention belongs to the technical field of bottom mud resource construction, and discloses a 3D printing baking-free brick and a raw material mixing device, and the 3D printing baking-free brick and the raw material mixing device comprise pretreatment S1 of raw materials required by the 3D printing baking-free brick and preparation S2 of the 3D printing baking-free brick. According to the invention, a low-cost, low-energy-consumption, low-pollution and reliable bottom mud brick preparation method is developed, a 3D printing technology is combined with production of bottom mud baking-free bricks, and river heavy metal polluted bottom mud and aquatic wastes are used as raw materials. According to the method, the problem that the bottom mud occupies land resources can be solved, pollutants of the bottom mud can be removed or fixed in the recycling process, the method has important significance in treatment of riverways, riverbeds and river water, damage and influence on the environment are reduced, and the requirements of sustainable development and ecological protection are met.

Description

Technical Field

[0001] The present application relates to the technical field of sludge resource construction, and more specifically, to a 3D printed unfired brick and a raw material mixing device. Background Art

[0002] With the rapid development of cities and the acceleration of industrialization, wastewater has invaded urban rivers and polluted river water bodies. On the one hand, heavy metals in the overlying water bodies of rivers can be enriched in the surface sediments of the riverbed through precipitation, adsorption, and complexation. When water conditions change, heavy metals in the sediments will be released from the surface sediments of the riverbed through oxidation-reduction, dissolution, desorption, etc., causing pollution of the overlying water bodies. On the other hand, some rivers lack hydrodynamics, and the riverbed sediments cannot be effectively dredged for a long time, resulting in a vicious cycle. However, the conventional treatment method is stacking or landfilling, which results in a large waste of resources and occupation of land. In addition, long-term stacking will cause the leaching or migration of heavy metal pollutants in the dredged sediments, leading to secondary pollution of the surrounding environment.

[0003] At present, with the increasing attention paid to the ecological environment and the improvement of laws and regulations, the resource treatment, disposal and application of sediment have become a hot topic of research. Making bricks from sediment is the main trend of sediment resource utilization. Sediment bricks are ordinary bricks made of dehydrated sediment as the main material, mixed with cement, lime and other solid wastes. However, most of the sediment bricks currently used in riverbanks or ports have undergone a high-temperature sintering process, which not only leads to considerable energy consumption, but also causes excessive emissions of polluting gases such as SO2 and CO2. This preparation process involving drastic thermochemical changes changes the original properties of the sediment and also creates uncertainty in the risk of using building materials.

[0004] Therefore, developing a low-cost, low-energy, low-pollution and reliable method for preparing mud bricks is of great significance in the management of rivers, riverbeds and river water. Based on the above information, 3D printing technology is combined with the production of mud unburned bricks, and river heavy metal contaminated mud and aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) are used as raw materials. Not only can the problem of mud occupying land resources be solved, but also the pollutants in the mud can be removed or fixed in the process of resource utilization, reducing the damage and impact on the environment, which meets the needs of sustainable development and ecological protection.

[0005] In order to solve the above problems, the present application provides a 3D printing unfired brick and a raw material mixing device. Summary of the invention

[0006] The present application provides a 3D printing unburned brick and raw material mixing device adopts the following technical solution: A 3D printed unburned brick is made of the following raw materials in parts by weight: 60 parts of sludge powder, 30 parts of lime, 10 parts of cement, 30 parts of water, 0-1.8 parts of aquatic waste powder, 1.5 parts of water reducing agent, and 0.24 parts of thickener. The preparation method comprises the following steps: The riverbed mud was dried in an oven at a temperature of 105±3°C, ground into powder using a ball mill, and sieved with a 1 mm sieve to obtain the mud powder.

[0007] Add the sludge powder, cement, lime, water reducer and thickener in the proportions and mix them in sequence. Use a raw material mixing device to mix them. Gradually add the required water and continue mixing until the mixture is completely homogeneous.

[0008] Pour the prepared mixture into the barrel of the 3D printer and print the 3D printed unfired bricks according to the program set by the 3D printer slicing software.

[0009] The printed samples were removed from the printing platform and sealed with plastic wrap. The samples were naturally cured indoors for 28 days at a temperature of 25°C ± 3°C and a relative humidity of 90% ± 5%. The porosity rate set by the 3D printer slicing software is 35%, and the curing time is 28 days.

[0010] Furthermore, a raw material mixing device for 3D printing unfired bricks comprises a mixing barrel: support feet are evenly distributed on the periphery of the bottom of the mixing barrel, an adjustable discharging mechanism is provided between a pair of support feet on the bottom of the mixing barrel, a support frame evenly distributed within 180° is provided on the top of the mixing barrel, a mixing mechanism is provided on the top of the support frame, a cleaning mechanism is provided through the center of the bottom of the mixing barrel, a crushing mechanism is provided on the side of the top of the mixing barrel away from the support frame, a crushing mechanism bracket is provided on the side of the outer wall of the mixing barrel away from the support frame, and the crushing mechanism is connected to the mixing barrel through the crushing mechanism bracket.

[0011] Furthermore, the number of the support frames is three and they are evenly arranged within 180° of the top of the mixing barrel, and the number of the support feet is three and they are evenly distributed at the bottom of the mixing barrel.

[0012] Furthermore, the crushing mechanism includes a crusher shell, in which two layers of crushing wheels are evenly and tightly staggered, one side of the crusher shell is provided with an outer protective shell, and one end of the crushing wheel passes through the crusher shell and extends into the outer protective shell, and the outer wall of the crushing wheel extending into the outer protective shell is provided with a linkage wheel, and the outer periphery of the combined linkage wheels is provided with a surrounding linkage belt, one end of one of the crushing wheels away from the crusher shell is provided with a crushing motor, and the bottom of the crusher shell is provided with a feed pipe opening, and a waste pipe opening is penetrated by the side of the feed pipe opening away from the mixing barrel, and a vibrating screen is provided in the feed pipe opening.

[0013] Furthermore, the stirring mechanism includes a mounting plate, a stirring motor is provided on the top of the mounting plate, a fixed bevel gear is provided on the bottom of the mounting plate, a motor output end is provided on the top of the stirring motor, the motor output end on the stirring motor extends through the mounting plate and the fixed bevel gear, a tilting rod is provided on the outer wall of the motor output end, linkage rods are penetrated at both ends of the tilting rod, a pinion is provided at one end of the linkage rod close to the fixed bevel gear, and the pinion and the fixed bevel gear are meshed with each other, a ball shaft is provided at the intersection of the linkage rod, and the linkage rod penetrates the ball shaft and extends into the stirring barrel, a ball shaft disk is provided between the ends of the support frame close to the stirring barrel, a ball shaft groove is penetrated in the ball shaft disk, and the ball shaft rotates in the ball shaft groove, and a stirring head is provided at one end of the linkage rod close to the stirring barrel.

[0014] Furthermore, the cleaning mechanism includes a mechanical seal rotating shaft, an extension rod is provided through the mechanical seal rotating shaft, and the extension rod extends into the mixing barrel, and the outer wall of one end of the extension rod extending into the mixing barrel is provided with mutually symmetrical connecting rods, and the end of the connecting rod away from the extension rod is provided with a side wall scraper, and the side wall scraper is close to the inner wall of the mixing barrel, the bottom of the connecting rod is provided with a bottom scraper, and the bottom scraper is close to the bottom of the inner wall of the mixing barrel, and the end of the extension rod extending outside the mixing barrel is provided with a cleaning motor.

[0015] Furthermore, the adjustable discharging mechanism includes a discharging port, a discharging port is penetrated through the bottom of the inner wall of the mixing barrel, a combination plate giving way groove is penetrated between the discharging ports, and combination plates that are symmetrical and mutually engaged are arranged in the combination plate giving way groove, a combination groove is penetrated through the side where the combination plates are close to each other on one side, and a combination block is arranged on the side where the combination plates are close to each other on the other side, and a discharging slot is arranged at the bottom of the mixing barrel directly below the discharging port.

[0016] In summary, this application includes the following beneficial technical effects: 1. The present invention uses heavy metal-contaminated sludge and aquatic waste as raw materials for brick making, realizing resource recycling. In addition, the added water reducer and thickener have good performance, which can keep the slump of the raw materials in the feed bucket from decreasing significantly over time during the 3D printing process, and at the same time improve the 3D printing molding effect, thereby ensuring the printing effect of 3D printed unburned bricks.

[0017] 2. The present invention combines 3D printing technology with the production of unburned mud bricks, which not only utilizes the mud produced by river dredging and converts it into building materials, but also the production of unburned bricks does not require high-temperature sintering, which can significantly save the cost of brick making. 3D printing technology can achieve automation and rapid construction, and can easily realize complex geometric shapes and structural designs, which can significantly improve the efficiency and innovation of brick making.

[0018] 3. The present invention adopts the non-burning technology, which can save energy and reduce carbon dioxide emissions. Steam curing is not required during the curing process, which reduces costs. At the same time, by providing aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) powder as an admixture, the finished bricks have good self-fixing heavy metal performance, reducing their migration and transformation in the environment, thereby reducing the risk of environmental pollution. The production and application of sediment non-burning bricks can not only realize resource recycling and prevent secondary pollution of sediment, but also bring certain economic benefits.

[0019] 4.3D printing unburned brick raw material mixing device ensures rapid and uniform mixing of raw materials through the efficient operation of the stirring mechanism. The design of the stirring head and the synergy of the tilting rod and the linkage rod make the raw materials form a complex motion trajectory in the mixing barrel, effectively improving the mixing efficiency and uniformity. The design of the cleaning mechanism fully considers the cleanliness and hygiene of the equipment. Through the connection of the mechanical seal shaft and the extension rod, as well as the setting of the side wall scraper and the bottom scraper, the residues on the inner wall and bottom of the mixing barrel can be easily scraped off, avoiding the accumulation and hardening of raw materials and extending the service life of the equipment. The design of the adjustable discharging mechanism makes the discharge of raw materials more flexible and controllable. By adjusting the position and size of the combination plate, the width of the discharge port can be accurately controlled according to actual needs, so as to meet different operation requirements and improve the adaptability and flexibility of the equipment. The crushing mechanism realizes efficient crushing of raw materials through the synergy of the two layers of evenly and tightly staggered crushing wheels, linkage wheels and linkage belts, crushing motors and other components inside. At the same time, the setting of the feed pipe mouth, waste pipe mouth and vibrating screen and other components further improves the flexibility and reliability of the crushing mechanism. The pulverizing mechanism not only improves the pulverizing efficiency and quality of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A flow chart of a 3D printed unburned brick based on heavy metal contaminated sludge and aquatic waste and a preparation method thereof according to the present invention; Figure 2 This is a schematic diagram of the overall structure of this application; Figure 3 This is a schematic diagram of the crushing mechanism structure of this application; Figure 4 This is a schematic diagram of the side section structure of the crushing mechanism of the present application; Figure 5 This is a schematic diagram of the stirring mechanism structure of this application; Figure 6 This is a schematic diagram of the ball-shaft-disk structure of the present application; Figure 7 This is a schematic diagram of the structure inside the mixing barrel of this application; Figure 8 This is a schematic diagram of the cleaning mechanism structure of this application; Fig. 9 This is a schematic diagram of the side section structure of the mixing barrel of the present application; Fig.10 This is a schematic diagram of the combined board structure of this application.

[0021] Description of the numbers in the figure: 1. Mixing barrel; 2. Support feet; 3. Support frame; 4. Crushing mechanism bracket; 5. Crushing mechanism; 501. Crusher shell; 502. Crushing wheel; 503. Outer protective shell; 504. Linkage wheel; 505. Linkage belt; 506. Feed pipe opening; 507. Waste pipe opening; 508. Vibrating screen; 509. Crushing motor; 6. Mixing mechanism; 601. Mounting plate; 602. Mixing motor; 603. Fixed bevel gear; 604. Motor output end; 605. Tilt rod; 606. 6. Linkage rod; 607. Pinion; 608. Ball shaft; 609. Ball shaft disc; 610. Stirring head; 611. Ball shaft groove; 7. Cleaning mechanism; 701. Mechanical seal shaft; 702. Extension rod; 703. Connecting rod; 704. Side wall scraper; 705. Bottom scraper; 706. Cleaning motor; 8. Adjustable discharging mechanism; 801. Discharging port; 802. Combination plate; 803. Discharging trough; 804. Combination plate make way groove; 805. Combination groove; 806. Combination block. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0023] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Embodiment 1: The present application discloses a 3D printed unfired brick and a raw material mixing device. Figure 1-Figure 10 , including pretreatment S1 of raw materials required for 3D printing unfired bricks and preparation S2 of 3D printing unfired bricks.

[0026] Specifically, the steps of pre-processing S1 of the raw materials required for 3D printing unfired bricks are as follows: A 3D printed unfired brick: made from the following raw materials in parts by weight: 60 parts of sludge powder, 30 parts of lime, 10 parts of cement, 30 parts of water, 0 parts of aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) powder, 1.5 parts of water reducer, and 0.24 parts of thickener.

[0027] AS1: The sediment powder needs to be pretreated before use. The pretreatment method is: dry the riverbed sediment in an oven at a temperature of 105±3°C, grind it into powder with a ball mill, sieve it with a 1 mm sieve, and store it in a polyvinyl chloride barrel.

[0028] BS1: The aquatic waste (oyster shell, shrimp shell and crab shell, shrimp shell and crab shell) powder needs to be pretreated before use. The pretreatment method is: after washing the discarded oyster shell, shrimp shell and crab shell, shrimp shell and crab shell with hydrochloric acid, grind them into powder with a ball mill, sieve them with a 1 mm sieve, and store them in a polyvinyl chloride barrel. The main component of the oyster shell, shrimp shell and crab shell, shrimp shell and crab shell powder is calcium oxide, which has a large surface area and the hydroxyl functional group has a strong electrostatic affinity at its coordination site, thereby forming a complex to improve the adsorption capacity of heavy metal ions.

[0029] Specifically, the preparation S2 operation steps of the 3D printed unfired brick are as follows: AS2: First, the raw materials are prepared. The riverbed mud is dried in an oven at 105±3℃, ground into powder with a ball mill, and sieved with a 1 mm sieve to obtain the mud powder.

[0030] BS2: Next is the mixing of raw materials. The sludge powder is added to cement, lime, water reducer and thickener in the order of proportion and mixed using a raw material mixing device. The required water is gradually added and the mixing is continued until the mixture is completely homogeneous.

[0031] CS2: The second step is 3D printing. The prepared mixture is poured into the barrel of the 3D printer and the 3D printed unburned bricks are printed according to the program set by the 3D printer slicer software. The porosity rate set by the slicer software is 35%.

[0032] DS2: Finally, the printed samples were removed from the printing platform and sealed with plastic wrap. The samples were naturally cured indoors for 28 days at a temperature of 25°C ± 3°C and a relative humidity of 90% ± 5%.

[0033] Embodiment 2: Specifically, the steps of pre-processing S1 of the raw materials required for 3D printing unfired bricks are as follows: A 3D printed unfired brick: made from the following raw materials in parts by weight: 60 parts of sludge powder, 30 parts of lime, 10 parts of cement, 30 parts of water, 0.6 parts of aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) powder, 1.5 parts of water reducer, and 0.24 parts of thickener.

[0034] AS1: The sediment powder needs to be pretreated before use. The pretreatment method is: dry the riverbed sediment in an oven at a temperature of 105±3°C, grind it into powder with a ball mill, sieve it with a 1 mm sieve, and store it in a polyvinyl chloride barrel.

[0035] BS1: The aquatic waste (oyster shell, shrimp shell and crab shell, shrimp shell and crab shell) powder needs to be pretreated before use. The pretreatment method is: after washing the discarded oyster shell, shrimp shell and crab shell, shrimp shell and crab shell with hydrochloric acid, grind them into powder with a ball mill, sieve them with a 1 mm sieve, and store them in a polyvinyl chloride barrel. The main component of the oyster shell, shrimp shell and crab shell, shrimp shell and crab shell powder is calcium oxide, which has a large surface area and the hydroxyl functional group has a strong electrostatic affinity at its coordination site, thereby forming a complex to improve the adsorption capacity of heavy metal ions.

[0036] Specifically, the preparation S2 operation steps of the 3D printed unfired brick are as follows: AS2: First, the raw materials are prepared. The riverbed mud is dried in an oven at 105±3℃, ground into powder with a ball mill, and sieved with a 1 mm sieve to obtain the mud powder.

[0037] BS2: Next is the mixing of raw materials. The sludge powder is added to cement, lime, water reducer and thickener in the order of proportion and mixed using a raw material mixing device. The required water is gradually added and the mixing is continued until the mixture is completely homogeneous.

[0038] CS2: The second step is 3D printing. The prepared mixture is poured into the barrel of the 3D printer and the 3D printed unburned bricks are printed according to the program set by the 3D printer slicer software. The porosity rate set by the slicer software is 35%.

[0039] DS2: Finally, the printed samples were removed from the printing platform and sealed with plastic wrap. The samples were naturally cured indoors for 28 days at a temperature of 25°C ± 3°C and a relative humidity of 90% ± 5%.

[0040] Embodiment three: Specifically, the steps of pre-processing S1 of the raw materials required for 3D printing unfired bricks are as follows: A 3D printed unfired brick: made from the following raw materials in parts by weight: 60 parts of sludge powder, 30 parts of lime, 10 parts of cement, 30 parts of water, 1.8 parts of aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) powder, 1.5 parts of water reducer, and 0.24 parts of thickener.

[0041] AS1: The sediment powder needs to be pretreated before use. The pretreatment method is: dry the riverbed sediment in an oven at a temperature of 105±3°C, grind it into powder with a ball mill, sieve it with a 1 mm sieve, and store it in a polyvinyl chloride barrel.

[0042] BS1: The aquatic waste (oyster shell, shrimp shell and crab shell, shrimp shell and crab shell) powder needs to be pretreated before use. The pretreatment method is: after washing the discarded oyster shell, shrimp shell and crab shell, shrimp shell and crab shell with hydrochloric acid, grind them into powder with a ball mill, sieve them with a 1 mm sieve, and store them in a polyvinyl chloride barrel. The main component of the oyster shell, shrimp shell and crab shell, shrimp shell and crab shell powder is calcium oxide, which has a large surface area and the hydroxyl functional group has a strong electrostatic affinity at its coordination site, thereby forming a complex to improve the adsorption capacity of heavy metal ions.

[0043] Specifically, the preparation S2 operation steps of the 3D printed unfired brick are as follows: AS2: First, the raw materials are prepared. The riverbed mud is dried in an oven at 105±3℃, ground into powder with a ball mill, and sieved with a 1 mm sieve to obtain the mud powder.

[0044] BS2: Next is the mixing of raw materials. The sludge powder is added to cement, lime, water reducer and thickener in the order of proportion and mixed using a raw material mixing device. The required water is gradually added and the mixing is continued until the mixture is completely homogeneous.

[0045] CS2: The second step is 3D printing. The prepared mixture is poured into the barrel of the 3D printer and the 3D printed unburned bricks are printed according to the program set by the 3D printer slicer software. The porosity rate set by the slicer software is 35%.

[0046] DS2: Finally, the printed samples were removed from the printing platform and sealed with plastic wrap. The samples were naturally cured indoors for 28 days at a temperature of 25°C ± 3°C and a relative humidity of 90% ± 5%.

[0047] Embodiment 4: As a test of the above two embodiments, specifically: Test 1: Compressive strength test. Refer to the compressive strength test in JGJ / T293-2013 "Technical Code for Application of Silt Porous Bricks" to test the samples and calculate the compressive strength.

[0048] The above-mentioned Example 1 and Example 2 both meet the compressive strength requirements of JGJ / T293-2013 "Technical Code for Application of Silt Porous Bricks".

[0049] Experiment 2: The leaching test of heavy metals in bricks under simulated rainfall conditions. The artificial rainfall simulation device was used to control the rainfall intensity. The erosion effect of rainfall runoff on heavy metals in bricks was simulated. The experiment simulated the precipitation process in our city in the past 10 years and calculated the total precipitation according to the calculation formula (1).

[0050] (1) Where V is the total precipitation, mL; p is the annual precipitation, cm; t is the simulation time, y; r is the reactor radius, cm.

[0051] In order to approach the worst case of heavy metal dissolution, the annual precipitation was selected as the maximum precipitation in the past 10 years (2012-2022) (refer to the 2022 annual report of water conditions in our city) (p = 2270mm); the total precipitation simulated in the experiment was 178285mL, calculated according to formula (1). The experiment lasted 2.5 days, and the water flow rate of each reactor was 49.52 mL / min. The experiment was repeated at room temperature of 26℃.

[0052] After leaching, the samples were collected once at 0 min, 20 min, 180 min, 360 min, 0.5 d, 1 d, 1.5 d, 2 d, and 2.5 d and filtered through a 0.45 μm filter membrane to analyze the concentration of heavy metals in the leachate in order to study the influence of the leaching scenario on the leaching of heavy metals in bricks. The test results are shown in Table 1.

[0053] Table 1

[0054] The test detected four heavy metals, namely Zn, Cu, Hg, and Pb. The leaching concentrations of Zn and Cu were found to be in line with the minimum limits of GB / T14848-2017 "Groundwater Quality Standard", while Hg and Pb were not detected. Therefore, the heavy metal fixation effect of the bottom mud bricks prepared by the present invention meets the requirements.

[0055] The raw material mixing device for 3D printing unburned bricks comprises a mixing barrel 1: the outer periphery of the bottom of the mixing barrel 1 is provided with evenly distributed support feet 2, the bottom of the mixing barrel 1 is provided with an adjustable discharging mechanism 8 between one pair of support feet 2, the top of the mixing barrel 1 is provided with a support frame 3 evenly distributed within 180°, the top of the support frame 3 is provided with a stirring mechanism 6, the bottom center of the mixing barrel 1 is provided with a cleaning mechanism 7, the side of the top of the mixing barrel 1 away from the support frame 3 is provided with a crushing mechanism 5, the side of the outer wall of the mixing barrel 1 away from the support frame 3 is provided with a crushing mechanism bracket 4, and the crushing mechanism 5 is connected to the mixing barrel 1 through the crushing mechanism bracket 4, the number of the support frames 3 is three and evenly arranged within 180° of the top of the mixing barrel 1, the number of the support feet 2 is three and evenly distributed to the bottom of the mixing barrel 1, and the 3D printing unburned brick raw material mixing device is reasonably designed and fully functional. Through the synergistic effect of the stirring mechanism, the crushing mechanism, the cleaning mechanism and the adjustable discharging mechanism, efficient mixing and flexible discharging of the raw materials are achieved. At the same time, the design of the supporting feet and the support frame ensures the stability and safety of the device. This device not only improves the mixing quality and production efficiency of raw materials, but also provides reliable raw material guarantee for the subsequent 3D printing process.

[0056] The pulverizing mechanism 5 comprises a pulverizer shell 501, in which two layers of crushing wheels 502 are evenly and closely staggered, one side of the pulverizer shell 501 is provided with an outer protective shell 503, and one end of the crushing wheel 502 passes through the pulverizer shell 501 and extends into the outer protective shell 503, and the outer wall of the crushing wheel 502 extending into the outer protective shell 503 is provided with a linkage wheel 504, and the outer periphery of the combined linkage wheel 504 is provided with a surrounding linkage belt 505, one of the crushing wheels A crushing motor 509 is provided at one end of the crushing wheel 502 away from the crusher housing 501, a feed pipe opening 506 is provided at the bottom of the crusher housing 501, a waste pipe opening 507 is provided through the side of the feed pipe opening 506 away from the mixing barrel 1, and a vibrating screen 508 is provided inside the feed pipe opening 506. The crushing mechanism 5 realizes efficient crushing of raw materials through the synergistic effect of the two layers of crushing wheels 502, linkage wheels 504 and linkage belts 505, crushing motors 509 and other components that are evenly and tightly staggered inside. At the same time, the provision of components such as the feed pipe opening 506, the waste pipe opening 507 and the vibrating screen 508 further improves the flexibility and reliability of the crushing mechanism. The crushing mechanism not only improves the crushing efficiency and quality of raw materials, but also provides reliable raw material guarantee for subsequent mixing and 3D printing processes.

[0057] The stirring mechanism 6 includes a mounting plate 601, a stirring motor 602 is provided on the top of the mounting plate 601, a fixed bevel gear 603 is provided on the bottom of the mounting plate 601, a motor output end 604 is provided on the top of the stirring motor 602, the motor output end 604 on the stirring motor 602 extends through the mounting plate 601 and the fixed bevel gear 603, a tilting rod 605 is provided on the outer wall of the motor output end 604, both ends of the tilting rod 605 are penetrated by linkage rods 606, a pinion 607 is provided at one end of the linkage rod 606 close to the fixed bevel gear 603, and the pinion 607 and the fixed bevel gear 603 are meshed with each other, and a ball shaft 608 is provided at the intersection of the linkage rod 606. The linkage rod 606 penetrates the ball shaft 608 and extends out into the mixing barrel 1. The support frame 3 is provided with a ball shaft disc 609 at one end close to the mixing barrel 1. The ball shaft disc 609 is provided with a ball shaft groove 611, and the ball shaft 608 rotates in the ball shaft groove 611. The linkage rod 606 is provided with a stirring head 610 at one end close to the mixing barrel 1. The stirring mechanism 6 realizes efficient stirring and mixing of the raw materials through the synergistic effect of the internal mounting disc 601, the stirring motor 602, the fixed bevel gear 603, the motor output end 604, the tilting rod 605, the linkage rod 606, the pinion 607, the ball shaft 608, the ball shaft disc 609, the ball shaft groove 611 and the stirring head 610. The stirring mechanism not only improves the mixing uniformity and efficiency of the raw materials, but also ensures the stability and reliability of the stirring process. The design not only optimizes the mixing effect of the raw materials.

[0058] The cleaning mechanism 7 includes a mechanical seal shaft 701, an extension rod 702 is provided through the mechanical seal shaft 701, and the extension rod 702 extends into the mixing barrel 1, and a symmetrical connecting rod 703 is provided on the outer wall of one end of the extension rod 702 extending into the mixing barrel 1, and a side wall scraper 704 is provided at the end of the connecting rod 703 away from the extension rod 702, and the side wall scraper 704 is close to the inner wall of the mixing barrel 1, and a bottom scraper 705 is provided at the bottom of the connecting rod 703, and the bottom scraper 705 is close to the bottom of the inner wall of the mixing barrel 1, and a cleaning motor 706 is provided at one end of the extension rod 702 extending outside the mixing barrel 1. The cleaning mechanism 7 realizes comprehensive and efficient cleaning of the inner wall and bottom of the mixing barrel 1 through the coordinated action of the mechanical seal shaft 701, the extension rod 702, the connecting rod 703, the side wall scraper 704, the bottom scraper 705 and the cleaning motor 706 and other components inside. The cleaning mechanism not only improves the cleanliness and hygiene of the equipment, but also prolongs the service life of the equipment. It is reasonably designed and easy to operate.

[0059] The adjustable discharging mechanism 8 includes a discharging port 801, a discharging port 801 is provided through the bottom of the inner wall of the mixing barrel 1, a combination plate giving slot 804 is provided between the discharging ports 801, and a combination plate giving slot 804 is provided in the combination plate giving slot 804, which is symmetrical and mutually engaged with each other. A combination slot 805 is provided through the side where the combination plates 802 are close to each other on one side, and a combination block 806 is provided on the side where the combination plates 802 are close to each other on the other side. A discharging slot 803 is provided at the bottom of the mixing barrel 1 directly below the discharging port 801. The adjustable discharging mechanism 8 realizes precise control of the discharge of raw materials through the coordinated action of the discharging port 801, the combination plate 802, the combination plate giving slot 804, the combination slot 805, the combination block 806 and the discharging slot 803 and other components inside it. The mechanism is reasonably designed and easy to operate, and can adjust the size of the discharging port according to actual needs, thereby meeting different operation requirements. Its stability and durability are also fully guaranteed.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A 3D printed unburned brick, made of the following raw materials in parts by weight: 60 parts of sludge powder, 30 parts of lime, 10 parts of cement, 30 parts of water, 0-1.8 parts of aquatic waste powder, 1.5 parts of water reducing agent, and 0.24 parts of thickener. The preparation method comprises the following steps: The riverbed mud was placed in an oven at a temperature of 105±3°C to dry, ground into powder using a ball mill, and sieved using a 1 mm sieve to obtain the mud powder; Add the bottom mud powder, cement, lime, water reducer and thickener in the proportions and mix them in sequence, use a raw material mixing device to mix, gradually add the required water, and continue mixing until the mixture is completely homogeneous; Pour the prepared mixture into the barrel of the 3D printer and print the 3D printed unburned bricks according to the program set by the 3D printer slicing software; The printed samples were removed from the printing platform and sealed with plastic wrap. The samples were naturally cured indoors for 28 days at a temperature of 25°C ± 3°C and a relative humidity of 90% ± 5%. The porosity rate set by the 3D printer slicing software is 35%, and the curing time is 28 days.

2. A raw material mixing device for preparing the 3D printed unburned brick according to claim 1, characterized in that: The invention comprises a mixing barrel (1): the outer periphery of the bottom of the mixing barrel (1) is provided with evenly distributed supporting feet (2); the bottom of the mixing barrel (1) is provided with an adjustable discharging mechanism (8) between a pair of supporting feet (2) facing each other; the top of the mixing barrel (1) is provided with a supporting frame (3) evenly distributed within 180 degrees; the top of the supporting frame (3) is provided with a mixing mechanism (6); a cleaning mechanism (7) is provided through the center of the bottom of the mixing barrel (1); a crushing mechanism (5) is provided on the side of the top of the mixing barrel (1) away from the supporting frame (3); a crushing mechanism bracket (4) is provided on the side of the outer wall of the mixing barrel (1) away from the supporting frame (3); and the crushing mechanism (5) is connected to the mixing barrel (1) through the crushing mechanism bracket (4).

3. The raw material mixing device according to claim 2, characterized in that: The number of the support frames (3) is three and they are evenly installed within 180° of the top of the mixing barrel (1); the number of the support legs (2) is three and they are evenly distributed at the bottom of the mixing barrel (1).

4. The raw material mixing device according to claim 2, characterized in that: The pulverizing mechanism (5) comprises a pulverizer housing (501), wherein two layers of evenly and closely staggered crushing wheels (502) are arranged in the pulverizer housing (501), an outer protective shell (503) is arranged on one side of the pulverizer housing (501), and one end of the crushing wheel (502) passes through the pulverizer housing (501) and extends into the outer protective shell (503), and a linkage wheel (503) is arranged on the outer wall of the crushing wheel (502) extending into the outer protective shell (503). 04), a surrounding linkage belt (505) is provided on the periphery of the combined linkage wheel (504), a grinding motor (509) is provided on one end of one of the crushing wheels (502) away from the pulverizer housing (501), a feed pipe opening (506) is provided at the bottom of the pulverizer housing (501), a waste pipe opening (507) is provided through the side of the feed pipe opening (506) away from the mixing barrel (1), and a vibrating screen (508) is provided inside the feed pipe opening (506).

5. The raw material mixing device according to claim 2, characterized in that: The stirring mechanism (6) comprises a mounting plate (601), a stirring motor (602) is provided on the top of the mounting plate (601), a fixed bevel gear (603) is provided on the bottom of the mounting plate (601), a motor output end (604) is provided on the top of the stirring motor (602), the motor output end (604) on the stirring motor (602) passes through the mounting plate (601) and the fixed bevel gear (603) and extends out, a tilting rod (605) is provided on the outer wall of the motor output end (604), linkage rods (606) are provided at both ends of the tilting rod (605), and the linkage rod (606) is close to the fixed bevel gear (603). A pinion (607) is provided at one end of the tooth (603), and the pinion (607) and the fixed bevel tooth (603) are meshed with each other. A ball shaft (608) is provided at the intersection of the linkage rod (606), and the linkage rod (606) passes through the ball shaft (608) and extends out into the mixing barrel (1). A ball shaft disk (609) is provided between the ends of the support frame (3) close to the mixing barrel (1), a ball shaft groove (611) is passed through the ball shaft disk (609), and the ball shaft (608) rotates in the ball shaft groove (611), and a stirring head (610) is provided at the ends of the linkage rod (606) close to the mixing barrel (1).

6. The raw material mixing device according to claim 2, characterized in that: The cleaning mechanism (7) comprises a mechanical seal rotating shaft (701), an extension rod (702) passing through the mechanical seal rotating shaft (701), and the extension rod (702) extending into the mixing barrel (1), and a symmetrical connecting rod (703) is provided on the outer wall of one end of the extension rod (702) extending into the mixing barrel (1), and a side wall scraper (704) is provided at one end of the connecting rod (703) away from the extension rod (702), and the side wall scraper (704) is closely attached to the inner wall of the mixing barrel (1), and a bottom scraper (705) is provided at the bottom of the connecting rod (703), and the bottom scraper (705) is closely attached to the bottom of the inner wall of the mixing barrel (1), and a cleaning motor (706) is provided at one end of the extension rod (702) extending outside the mixing barrel (1).

7. The raw material mixing device according to claim 2, characterized in that: The adjustable discharge mechanism (8) comprises a discharge port (801), the discharge port (801) is provided through the bottom of the inner wall of the mixing barrel (1), a combination plate clearance groove (804) is provided through the discharge port (801), and the combination plates (802) that are symmetrical and mutually engaged are provided in the combination plate clearance groove (804), a combination groove (805) is provided through the side where the combination plates (802) are close to each other on one side, and a combination block (806) is provided on the side where the combination plates (802) are close to each other on the other side, and a discharge groove (803) is provided at the bottom of the mixing barrel (1) directly below the discharge port (801).

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