A 3D printing non-fired brick and raw material mixing device

Abstract

This application belongs to the technical field of sediment resource construction, and discloses a 3D printing non-fired brick and raw material mixing device, including pretreatment S1 of raw materials required for 3D printing non-fired bricks and preparation S2 of 3D printing non-fired bricks. By developing a low-cost, low-energy-consumption, low-pollution and reliable method for preparing sediment bricks, the present invention combines 3D printing technology with the production of sediment non-fired bricks, and at the same time uses river heavy metal polluted sediment and aquatic product waste as raw materials. It can not only solve the problem of sediment occupying land resources, but also remove or fix the pollutants in the sediment during the resource utilization process, which is of great significance in the treatment of rivers, river beds and river water, reduces the damage and impact on the environment, and meets the requirements of sustainable development and ecological protection.

Description

Technical Field

[0001] This application relates to the technical field of sediment resource construction, and more specifically, to a 3D printing non-burned brick and raw material mixing device. Background Art

[0002] With the rapid development of cities and the acceleration of the industrialization process, a large amount of wastewater invades urban rivers, causing serious pollution to the river water bodies. On the one hand, heavy metals in the overlying water of the river can be enriched in the bottom sediment on the surface of the riverbed through precipitation, adsorption, complexation and other effects. When the water body conditions change, the heavy metals in the sediment will be released from the bottom sediment on the surface of the riverbed through oxidation-reduction, dissolution, desorption and other effects, causing pollution of the overlying water body. On the other hand, the hydrodynamic force of some rivers is insufficient, and the river bottom sediment cannot be effectively dredged for a long time, resulting in a vicious cycle. However, the conventional treatment methods are stacking or landfilling, which causes a waste of a large amount of resources and occupation of land. In addition, long-term stacking will cause the leaching or migration of heavy metal pollutants in the dredged sediment, resulting in secondary pollution of the surrounding environment.

[0003] At present, with the emphasis on the ecological environment and the improvement of laws and regulations, the resource treatment, disposal and application of sediment have become a research hotspot. Using sediment to make bricks is the main trend of sediment resource utilization. Sediment bricks are ordinary bricks mainly made of dehydrated sediment and mixed with solid wastes such as cement and lime. However, most of the sediment bricks currently applied to river embankments or ports have undergone a high-temperature sintering process, which not only causes a considerable amount of energy consumption, but also results in 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 generates uncertainties in the use risks of building materials.

[0004] Therefore, developing a low-cost, low-energy-consumption, low-pollution and reliable method for preparing sediment bricks is of great significance in the treatment of rivers, riverbeds and river water. Based on the above information, combining 3D printing technology with the production of non-burned sediment bricks, and using heavy metal-polluted sediment in rivers and aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) as raw materials. It can not only solve the problem of sediment occupying land resources, but also remove or fix the pollutants in the sediment during the resource utilization process, reducing the damage and impact on the environment, and meeting the requirements of sustainable development and ecological protection.

[0005] To solve the above problems, this application provides a 3D printing non-burned brick and raw material mixing device. Summary of the Invention

[0006] The 3D printing non-burned brick and raw material mixing device provided by this application adopts the following technical solutions:

[0007] A 3D printed non-fired brick is made of raw materials containing the following parts by weight: 60 parts of bottom mud 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 reducer, and 0.24 parts of thickener.

[0008] Its preparation method includes the following steps:

[0009] The river bottom mud is dried in an oven at a temperature of 105 ± 3°C, ground into powder with a ball mill, and sieved with a 1mm sieve to obtain the bottom mud powder.

[0010] The bottom mud powder, cement, lime, water reducer, and thickener are added in sequence according to the ratio and mixed with a raw material mixing device. The required water is gradually added and mixing continues until the mixture is completely homogeneous.

[0011] The prepared mixture is poured into the cartridge of a 3D printer, and the 3D printed non-fired brick is printed according to the program set by the 3D printer slicing software.

[0012] The printed sample is removed from the printing platform, sealed with plastic wrap, and the samples are all cured indoors naturally for 28 days at a temperature of 25°C ± 3°C and a relative humidity of 90% ± 5%.

[0013] The porosity set by the 3D printer slicing software is 35% and the curing time is 28 days.

[0014] Furthermore, a raw material mixing device for 3D printing non-fired bricks includes a stirring barrel: uniformly distributed supporting feet are provided on the outer periphery of the bottom of the stirring barrel, an adjustable discharging mechanism is provided between a pair of opposite supporting feet at the bottom of the stirring barrel, uniformly distributed support frames are provided within 180° at the top of the stirring barrel, a stirring mechanism is provided on the top of the support frames, a cleaning mechanism is provided through the center position at the inner bottom of the stirring barrel, a crushing mechanism is provided on one side of the top of the stirring barrel away from the support frames, a crushing mechanism support is provided on one side of the outer wall of the stirring barrel away from the support frames, and the crushing mechanism is connected to the stirring barrel through the crushing mechanism support. The crushing mechanism includes a crusher housing, two layers of uniformly and tightly staggered crushing wheels are provided in the crusher housing, an outer protective housing is provided on one side of the crusher housing, and one end of each crushing wheel extends through the crusher housing to the inside of the outer protective housing. Driving wheels are provided on the outer walls of the crushing wheels extending into the outer protective housing, a surrounding driving belt is provided around the combined driving wheels, a crushing motor is provided at one end of one of the crushing wheels away from the crusher housing, a feed pipe opening is provided at the bottom of the crusher housing, a waste pipe opening penetrates through one side of the feed pipe opening away from the stirring barrel, a vibrating screen is provided in the feed pipe opening. 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 at the bottom of the mounting plate, a motor output end is provided on the top of the stirring motor, and the motor output end on the stirring motor penetrates through the mounting plate and the fixed bevel gear and extends out. Inclined rods are provided on the outer wall of the motor output end, connecting rods are provided through both ends of the inclined rods, a small gear is provided at one end of the connecting rod close to the fixed bevel gear, and the small gear meshes with the fixed bevel gear. A ball shaft is provided at the intersection of the connecting rods, and the connecting rods penetrate through the ball shaft and extend into the stirring barrel. Ball shaft discs are provided between the opposite ends of the support frames close to the stirring barrel, a ball shaft groove is provided through the ball shaft discs, and the ball shaft rotates in the ball shaft groove. Stirring heads are provided at one end of each connecting rod close to the stirring barrel. 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 stirring barrel. Symmetrically arranged connecting rods are provided on the outer wall of one end of the extension rod extending into the stirring barrel, side wall scraping plates are provided at one end of each connecting rod away from the extension rod, and the side wall scraping plates are closely attached to the inner wall of the stirring barrel. Bottom scraping plates are provided at the bottom of each connecting rod, and the bottom scraping plates are closely attached to the inner bottom of the stirring barrel. A cleaning motor is provided at one end of the extension rod extending out of the stirring barrel.

[0015] Furthermore, the number of the support frames is three and they are evenly arranged within 180° at the top of the stirring barrel, and the number of the supporting feet is three and they are evenly distributed at the bottom of the stirring barrel.

[0016] 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.

[0017] In summary, this application includes the following beneficial technical effects:

[0018] 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.

[0019] 2. The present invention combines 3D printing technology with the production of unburned mud bricks. It 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.

[0020] 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.

[0021] 4. The raw material mixing device for 3D printing non - fired bricks ensures the rapid and uniform mixing of raw materials through the efficient operation of the stirring mechanism. The design of the stirring head and the coordinated action of the inclined rod and the linkage rod enable the raw materials to form complex movement trajectories in the stirring 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 rotating shaft and the extension rod, and the setting of the side wall scraper and the bottom scraper, the residues on the inner wall and bottom of the stirring barrel can be easily scraped off, avoiding the accumulation and hardening of raw materials, extending the service life of the equipment. The design of the adjustable discharging mechanism makes the discharging of raw materials more flexible and controllable. By adjusting the position and size of the combined plate, the width of the discharging port can be accurately controlled according to actual needs, thus meeting different operation requirements and improving the adaptability and flexibility of the equipment. The crushing mechanism realizes the efficient crushing of raw materials through the coordinated action of components such as two layers of evenly and tightly staggered crushing wheels, linkage wheels, linkage belts, and crushing motors inside it. At the same time, the setting of components such as the feeding pipe orifice, waste pipe orifice, and vibrating screen further improves the flexibility and reliability of the crushing mechanism. This crushing mechanism not only improves the crushing efficiency and quality of raw materials. Description of the Drawings

[0022] Figure 1 is a flowchart of a 3D printing non - fired brick and its preparation method based on heavy - metal - contaminated sediment and aquatic waste according to the present invention;

[0023] Figure 2 is a schematic diagram of the overall structure of this application;

[0024] Figure 3 is a schematic diagram of the structure of the crushing mechanism of this application;

[0025] Figure 4 is a schematic diagram of the side - sectional structure of the crushing mechanism of this application;

[0026] Figure 5 is a schematic diagram of the structure of the stirring mechanism of this application;

[0027] Figure 6 is a schematic diagram of the structure of the spherical shaft disc of this application;

[0028] Figure 7 is a schematic diagram of the internal structure of the stirring barrel of this application;

[0029] Figure 8 is a schematic diagram of the structure of the cleaning mechanism of this application;

[0030] Figure 9 is a schematic diagram of the side - sectional structure of the stirring barrel of this application;

[0031] Figure 10 is a schematic diagram of the structure of the combined plate of this application.

[0032] Explanation of the reference numerals in the figures:

[0033] 1. Stirring barrel; 2. Support feet; 3. Support frame; 4. Crushing mechanism bracket; 5. Crushing mechanism; 501. Crusher housing; 502. Crushing wheel; 503. Outer protective shell; 504. Linking wheel; 505. Linking belt; 506. Feed pipe opening; 507. Waste pipe opening; 508. Vibrating screen mesh; 509. Crushing motor; 6. Stirring mechanism; 601. Mounting plate; 602. Stirring motor; 603. Fixed bevel gear; 604. Motor output end; 605. Inclined rod; 606. Linking rod; 607. Small gear; 608. Ball shaft; 609. Ball shaft plate;

[0034] 610. Stirring head; 611. Ball shaft groove; 7. Cleaning mechanism; 701. Mechanically sealed rotating shaft; 702. Extension rod; 703. Connecting rod; 704. Side wall scraper; 705. Bottom scraper; 706. Cleaning motor; 8. Adjustable discharging mechanism; 801. Discharge port; 802. Combined plate; 803. Discharge chute; 804. Combined plate relief groove; 805. Combined groove; 806. Combined block. Detailed implementation manners

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0036] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "sheathed / 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0038] Example 1:

[0039] This application example discloses a 3D printed non-fired brick and its raw material mixing device. Please refer to Figure 1- Figure 10 , which includes the pretreatment S1 of the raw materials required for 3D printed non-fired bricks and the preparation S2 of 3D printed non-fired bricks.

[0040] Specifically, the operation steps of the pretreatment S1 of the raw materials required for 3D printed non-fired bricks are as follows:

[0041] A 3D printed non-fired brick: It is made of raw materials containing the following weight parts: 60 parts of bottom mud 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 reducing agent, and 0.24 parts of thickening agent.

[0042] AS1: The bottom mud powder needs to be pretreated before use. The pretreatment method is: Place the river bottom mud in an oven at a temperature of 105 ± 3°C for drying, grind it into powder with a ball mill, and sieve it with a 1 mm sieve, then store it in a polyvinyl chloride bucket.

[0043] BS1: The aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) powder needs to be pretreated before use. The pretreatment method is: After washing the waste oyster shells, shrimp shells and crab shells, shrimp shells and crab shells with hydrochloric acid, grind them into powder with a ball mill, and sieve it with a 1 mm sieve, then store it in a polyvinyl chloride bucket. The main components of oyster shells, shrimp shells and crab shells, shrimp shells and crab shells powder are calcium oxide, which has a large surface area and strong electrostatic affinity at its coordination sites with hydroxyl functional groups, thus forming a complex to improve the adsorption capacity for heavy metal ions.

[0044] Specifically, the operation steps of the preparation S2 of 3D printed non-fired bricks are as follows:

[0045] AS2: First is the raw material preparation. Place the river bottom mud in an oven at a temperature of 105 ± 3°C for drying, grind it into powder with a ball mill, and sieve it with a 1 mm sieve to obtain the bottom mud powder.

[0046] BS2: Then is the raw material mixing. Add the bottom mud powder, cement, lime, water reducing agent, and thickening agent to the mixture in sequence according to the ratio, mix them with the raw material mixing device, gradually add the required water, and continue mixing until the mixture is completely homogeneous.

[0047] CS2: Secondly is the 3D printing. Pour the prepared mixture into the hopper of the 3D printer and print the 3D printed non-fired brick according to the program set by the 3D printer slicing software. The porosity set by the slicing software is 35%.

[0048] DS2: Finally, it is static curing. The printed sample is removed from the printing platform and sealed with plastic wrap. All samples are cured naturally indoors for 28 days at a temperature of 25°C ± 3°C and a relative humidity of 90% ± 5%.

[0049] Example 2:

[0050] Specifically, the pretreatment S1 operation steps of the raw materials required for the 3D printed non - fired brick are as follows:

[0051] A 3D printed non - fired brick: It is made of raw materials containing the following parts by weight: 60 parts of bottom mud powder, 30 parts of lime, 10 parts of cement, 30 parts of water, 0.6 part of aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) powder, 1.5 parts of water - reducing agent, and 0.24 part of thickening agent.

[0052] AS1: The bottom mud powder needs to be pretreated before use. The pretreatment method is: Place the river bottom mud in an oven at a temperature of 105 ± 3°C for drying, grind it into powder with a ball mill, sieve it with a 1 - mm sieve, and store it in a polyvinyl chloride bucket.

[0053] BS1: The aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) powder needs to be pretreated before use. The pretreatment method is: After washing the discarded oyster shells, shrimp shells and crab shells, shrimp shells and crab shells 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 bucket. The main component of the oyster shells, shrimp shells and crab shells, shrimp shells and crab shells powder is calcium oxide, which has a large surface area and strong electrostatic affinity at its coordination sites with hydroxyl functional groups, thus forming a complex to improve the adsorption capacity for heavy metal ions.

[0054] Specifically, the preparation S2 operation steps of the 3D printed non - fired brick are as follows:

[0055] AS2: First is raw material preparation. Place the river bottom mud in an oven at a temperature of 105 ± 3°C for drying, grind it into powder with a ball mill, and sieve it with a 1 - mm sieve to obtain the bottom mud powder.

[0056] BS2: Then is raw material mixing. Add the bottom mud powder, cement, lime, water - reducing agent, and thickening agent to the mixture in sequence according to the ratio, mix them with a raw material mixing device, gradually add the required water, and continue mixing until the mixture is completely homogeneous.

[0057] CS2: Secondly, for 3D printing, the prepared mixture is poured into the cartridge of the 3D printer, and the 3D printed non-fired bricks are printed according to the program set by the slicing software of the 3D printer. The porosity set by the slicing software is 35%.

[0058] DS2: Finally, for static curing, the printed samples are removed from the printing platform and sealed with plastic wrap. The samples are all cured naturally indoors for 28 days at a temperature of 25°C ± 3°C and a relative humidity of 90% ± 5%.

[0059] Example 3:

[0060] Specifically, the pretreatment S1 operation steps of the raw materials required for the 3D printed non-fired bricks are as follows:

[0061] A 3D printed non-fired brick: It is made of raw materials containing the following weight parts: 60 parts of bottom mud 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 reducing agent, and 0.24 parts of thickening agent.

[0062] AS1: The bottom mud powder needs to be pretreated before use. The pretreatment method is: drying the river bottom mud in an oven at a temperature of 105 ± 3°C, grinding it into powder with a ball mill, sieving it with a 1 mm sieve, and storing it in a polyvinyl chloride bucket.

[0063] BS1: The aquatic waste (oyster shells, shrimp shells and crab shells, shrimp shells and crab shells) powder needs to be pretreated before use. The pretreatment method is: cleaning the waste oyster shells, shrimp shells and crab shells, shrimp shells and crab shells with hydrochloric acid, grinding them into powder with a ball mill, sieving them with a 1 mm sieve, and storing them in a polyvinyl chloride bucket. The main components of the oyster shells, shrimp shells and crab shells, shrimp shells and crab shells powder are calcium oxide, which has a large surface area and strong electrostatic affinity at its coordination sites with hydroxyl functional groups, thus forming a complex to improve the adsorption capacity for heavy metal ions.

[0064] Specifically, the preparation S2 operation steps of the 3D printed non-fired bricks are as follows:

[0065] AS2: First is raw material preparation. The river bottom mud is dried in an oven at a temperature of 105 ± 3°C, ground into powder with a ball mill, and sieved with a 1 mm sieve to obtain the bottom mud powder.

[0066] BS2: Then is raw material mixing. The bottom mud powder, cement, lime, water reducing agent, and thickening agent are added in sequence according to the ratio and mixed with a raw material mixing device. The required water is gradually added and mixing continues until the mixture is completely homogeneous.

[0067] CS2: Secondly, for 3D printing, the prepared mixture is poured into the cartridge of a 3D printer, and 3D printed non - fired bricks are printed according to the program set by the slicing software of the 3D printer. The porosity set by the slicing software is 35%.

[0068] DS2: Finally, for static curing, the printed samples are removed from the printing platform and sealed with plastic wrap. The samples are all cured naturally indoors for 28 days at a temperature of 25℃±3℃ and a relative humidity of 90%±5%.

[0069] Example 4:

[0070] As a test of the above two examples, specifically:

[0071] Test 1: Compressive strength test. Referring to the compressive strength test in JGJ / T293 - 2013 "Technical Specification for Application of Sludge Perforated Bricks", the samples are tested and the compressive strength is calculated.

[0072] Both Example 1 and Example 2 mentioned above meet the compressive strength requirements of JGJ / T293 - 2013 "Technical Specification for Application of Sludge Perforated Bricks".

[0073] Test 2: Leaching test of heavy metals in bricks under simulated rainfall conditions. An artificial simulated rainfall device is used to control the rainfall intensity. Through the erosion effect of simulated rainfall runoff on heavy metals in bricks, the test will simulate the precipitation process in our city in the past 10 years, and calculate the total precipitation according to the calculation formula (1).

[0074] V = p × t × π × r 2 (1)

[0075] In the formula, V is the total precipitation, mL; p is the annual precipitation, cm; t is the simulation time, y; r is the radius of the reactor, cm.

[0076] To approach the worst - case scenario of heavy metal dissolution, the maximum precipitation in the past 10 years (2012 - 2022) in our city (refer to the water situation annual report of our city in 2022) (p = 2270mm) is selected as the annual precipitation; the total precipitation simulated in the test is 178285 mL, calculated according to formula (1). The test lasts for 2.5 d, and the inlet flow rate of each reactor is 49.52 mL / min. The test is repeated at room temperature of 26℃.

[0077] After leaching once every 0 min, 20 min, 180 min, 360 min, 0.5 d, 1 d, 1.5 d, 2 d, and 2.5 d, it was filtered through a 0.45 μm filter membrane for analyzing the concentration of heavy metals in the leachate to study the influence of the leaching scenario on the leached heavy metals in the bricks. The test results are shown in Table 1 below.

[0078] Table 1

[0079]

[0080] The test detected 4 heavy metals, namely Zn, Cu, Hg, and Pb. Among them, the detected leaching concentrations of Zn and Cu met the minimum limits of the "Groundwater Quality Standard" GB / T 14848-2017, and Hg and Pb were not detected. Thus, it was obtained that the heavy metal fixation effect of the bottom mud bricks prepared by the present invention met the requirements.

[0081] The raw material mixing device for 3D printing non-fired bricks includes a stirring barrel 1. Uniformly distributed support feet 2 are provided on the outer periphery of the bottom of the stirring barrel 1. An adjustable discharging mechanism 8 is provided between a pair of opposite support feet 2 at the bottom of the stirring barrel 1. Uniformly distributed support frames 3 are provided within 180° at the top of the stirring barrel 1. A stirring mechanism 6 is provided at the top of the support frame 3. A cleaning mechanism 7 is provided through the center position of the inner bottom of the stirring barrel 1. A crushing mechanism 5 is provided on one side of the top of the stirring barrel 1 far from the support frame 3. A crushing mechanism support 4 is provided on the outer wall of the stirring barrel 1 on the side far from the support frame 3, and the crushing mechanism 5 is connected to the stirring barrel 1 through the crushing mechanism support 4. The number of the support frames 3 is three and they are uniformly arranged within 180° at the top of the stirring barrel 1. The number of the support feet 2 is three and they are uniformly distributed at the bottom of the stirring barrel 1. The raw material mixing device for 3D printing non-fired bricks is reasonably designed and has complete functions. Through the coordinated action of the stirring mechanism, the crushing mechanism, the cleaning mechanism, and the adjustable discharging mechanism, the efficient mixing and flexible discharging of the raw materials are realized. At the same time, the design of the support feet and the support frames ensures the stability and safety of the device. This device not only improves the mixing quality of the raw materials and the production efficiency but also provides a reliable raw material guarantee for the subsequent 3D printing process.

[0082] The crushing mechanism 5 includes a crusher housing 501. Inside the crusher housing 501, there are two layers of evenly and closely staggered crushing wheels 502. On one side of the crusher housing 501, there is an outer protective housing 503. One end of each crushing wheel 502 penetrates through the crusher housing 501 and extends into the outer protective housing 503. On the outer wall of the crushing wheel 502 extending into the outer protective housing 503, there are linkage wheels 504. Around the combined linkage wheels 504, there is a surrounding linkage belt 505. One of the crushing wheels 502 is provided with a crushing motor 509 at one end away from the crusher housing 501. At the bottom of the crusher housing 501, there is a feed pipe opening 506. On the side of the feed pipe opening 506 away from the mixing barrel 1, there is a waste pipe opening 507 penetrating through. Inside the feed pipe opening 506, there is a vibrating screen 508. Through the coordinated action of components such as the two layers of evenly and closely staggered crushing wheels 502, linkage wheels 504, linkage belt 505, and crushing motor 509 inside the crushing mechanism 5, efficient crushing of raw materials is achieved. At the same time, the settings of components such as the feed pipe opening 506, waste pipe opening 507, and vibrating screen 508 further improve the flexibility and reliability of the crushing mechanism. This 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.

[0083] The stirring mechanism 6 includes a mounting plate 601. At the top of the mounting plate 601, there is a stirring motor 602. At the bottom of the mounting plate 601, there is a fixed bevel gear 603. At the top of the stirring motor 602, there is a motor output end 604. The motor output end 604 on the stirring motor 602 penetrates through the mounting plate 601 and the fixed bevel gear 603 and extends out. On the outer wall of the motor output end 604, there is an inclined rod 605. Both ends of the inclined rod 605 are provided with linkage rods 606. At one end of the linkage rod 606 close to the fixed bevel gear 603, there is a small gear 607, and the small gear 607 meshes with the fixed bevel gear 603. At the intersection of the linkage rods 606, there is a ball shaft 608, and the linkage rod 606 penetrates through the ball shaft 608 and extends into the stirring barrel 1. At one end of the support frame 3 close to the stirring barrel 1, there is a ball shaft plate 609 provided relatively between them. A ball shaft groove 611 is penetrated in the ball shaft plate 609, and the ball shaft 608 rotates in the ball shaft groove 611. At one end of the linkage rod 606 close to the stirring barrel 1, there are stirring heads 610. Through the coordinated action of components such as the mounting plate 601, stirring motor 602, fixed bevel gear 603, motor output end 604, inclined rod 605, linkage rod 606, small gear 607, ball shaft 608, ball shaft plate 609, ball shaft groove 611 and stirring heads 610 inside the stirring mechanism 6, efficient stirring and mixing of raw materials are achieved. This stirring mechanism not only improves the mixing uniformity and efficiency of raw materials, but also ensures the stability and reliability of the stirring process. This design not only optimizes the mixing effect of raw materials.

[0084] The cleaning mechanism 7 includes a mechanical seal rotating shaft 701, an extension rod 702 is provided through the mechanical seal rotating 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 one 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 the cleaning of the mixing barrel 1 through the coordinated action of the mechanical seal rotating 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. Comprehensive and efficient cleaning of the inner wall and bottom. This cleaning mechanism not only improves the cleanliness and hygiene of the equipment, but also extends the service life of the equipment. It has a reasonable design and is easy to operate.

[0085] The adjustable discharging mechanism 8 includes a discharging port 801, the bottom of the inner wall of the mixing barrel 1 is provided with a discharging port 801, a combination plate clearance groove 804 is provided between the discharging ports 801, and the combination plate clearance groove 804 is provided with mutually symmetrical and mutually clamped combination plates 802, a combination groove 805 is provided on one side where the combination plates 802 are close to each other, and a combination block 806 is provided on the other side where the combination plates 802 are close to each other, and a discharging port 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 clearance groove 804, the combination groove 805, the combination block 806 and the discharging port 803 and other components inside. 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.

[0086] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A raw material mixing device for 3D printing unburned bricks, 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 support feet (2); the bottom of the mixing barrel (1) is provided with an adjustable discharging mechanism (8) between one pair of the support feet (2) facing each other; the top of the mixing barrel (1) is provided with evenly distributed support frames (3) within 180°; the top of the support 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 support frame (3); a crushing mechanism bracket (4) is provided on the side of the outer wall of the mixing barrel (1) away from the support frame (3); and the crushing mechanism (5) is connected to the mixing barrel (1) through the crushing mechanism bracket (4); the crushing mechanism (5) comprises a crusher shell (501); two layers of crushing wheels (502) are evenly and tightly distributed in an interlaced manner are provided in the crusher shell (501); an outer protective shell (503) is provided on one side of the crusher shell (501); One end of each crushing wheel (502) passes through the pulverizer housing (501) and extends into the outer protective housing (503); a linkage wheel (504) is provided on the outer wall of each crushing wheel (502) extending into the outer protective housing (503); a surrounding linkage belt (505) is provided around the outer periphery of the combined linkage wheels (504); a crushing motor (509) is provided at 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 on the side of the feed pipe opening (506) away from the mixing barrel (1); a vibrating screen (508) is provided in the feed pipe opening (506); the mixing mechanism (6) comprises a mounting plate (601); a mixing motor (602) is provided at the top of the mounting plate (601); a fixed bevel gear (603) is provided at the bottom of the mounting plate (601); the mixing motor (602) A motor output end (604) is provided at the top, and the motor output end (604) on the stirring motor (602) penetrates 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), and linkage rods (606) are penetrated at both ends of the tilting rod (605). A pinion gear (607) is provided at one end of the linkage rod (606) close to the fixed bevel gear (603), and the pinion gear (607) and the fixed bevel gear (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) penetrates the ball shaft (608) and extends out into the stirring barrel (1). A ball shaft disc (609) is provided between one end of the support frame (3) close to the mixing barrel (1), a ball shaft groove (611) is provided through the ball shaft disc (609), and the ball shaft (608) rotates in the ball shaft groove (611).The end of the linkage rod (606) close to the mixing barrel (1) is provided with a mixing head (610); the cleaning mechanism (7) comprises a mechanical seal rotating shaft (701); an extension rod (702) is provided through the mechanical seal rotating shaft (701); the extension rod (702) extends into the mixing barrel (1); a symmetrical connecting rod (703) is provided on the outer wall of the end of the extension rod (702) extending into the mixing barrel (1); a side wall scraper (704) is provided at the end of the connecting rod (703) away from the extension rod (702); the side wall scraper (704) is closely attached to the inner wall of the mixing barrel (1); a bottom scraper (705) is provided at the bottom of the connecting rod (703); 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 the end of the extension rod (702) extending outside the mixing barrel (1).

2. The raw material mixing device according to claim 1, 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).

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

4. A 3D printed unburned brick prepared by the raw material mixing device of claim 1, which 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 reducer, and 0.24 parts of thickener, 3D printed unfired bricks are prepared by the following steps: Place the riverbed mud in an oven at 105±3℃ to dry, grind into powder using a ball mill, and sieve with a 1 mm sieve to obtain 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.

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