A method and device for uniformly mixing cow dung granules into clay bricks

Abstract

The application discloses a uniform mixing device and method of pore-forming microspheres, which is characterized in that: firstly, the device is used for uniformly mixing the pore-forming microspheres made of cow dung into clay mud paste; secondly, the device is used for uniformly mixing the pore-forming microspheres into the clay mud paste by kneading the clay mud paste and spraying the pore-forming microspheres through the forward and reverse rotating kneading gear and the spraying barrel; thirdly, the device is used for further uniformly mixing the pore-forming microspheres into the clay mud paste by kneading the clay mud paste and spraying the pore-forming microspheres through the stretching and contracting engaging part and the spraying barrel, so that the closed pores are uniformly distributed in the clay bricks, the strength of the clay bricks is unchanged, and the clay consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of clay bricks, in particular to a method and device for uniformly mixing cow dung particles into clay bricks. BACKGROUND

[0002] Mass production of clay bricks will inevitably consume a large amount of high-quality clay resources, so there has been an attempt to find a process and material that can reduce the amount of clay used without reducing the strength of the bricks. In this way, people try to reduce the cost of clay bricks from two directions of reducing sintering energy and reducing the amount of clay. Cow dung has a stable fiber content (organic matter accounts for 60% of dry cow dung), and dry cow dung particles can be used as an internal combustion additive to replace coal in bricks to reduce the amount of clay used. However, the density of crushed cow dung particles is lighter than sand and clay, and cow dung particles are easily broken, so it is difficult to ensure that the cow dung particles are uniformly mixed into the clay paste.

[0003] In the prior art, Hongya County Qinggongping Machine Brick Factory discloses a preparation process for bricks (CN104609836A, publication date: May 13, 2015), A. 55% to 62% of shale and 27% to 32% of coal gangue are crushed and sieved to form a first mixture; B. 10% to 15% of cow dung is added to the first mixture and stirred uniformly to form an initial mixture; C. The initial mixture is formed into a brick after being formed into a blank and sintered. The obtained brick is lighter than the traditional brick, and the use of cow dung instead of internal combustion coal not only greatly shortens the sintering time compared to the traditional process, but also saves 0.01 yuan per brick, effectively reducing the cost. However, how to uniformly distribute the cow dung in the first mixture is not disclosed. If the cow dung is concentrated in a certain place in the brick, the compressive strength of the clay brick at that place will be greatly reduced.

[0004] Hefei Linuo New Material Trading Co., Ltd. disclosed a red mud sand-based permeable brick and its manufacturing method (CN105418141A, Publication Date: March 23, 2016). (1) Dried lemon peel, livestock and poultry manure, and pine needles were placed in a carbonization furnace and carbonized in the absence of air at a temperature of 450-500℃ for 20-30 minutes. After cooling to room temperature, nano titanium dioxide and waste white mineral oil were added and ground for 40-50 minutes to obtain carbon black material I. (2) Sugar filter mud was washed with water and dried, and then sent to a high-speed mixer to add hydroxypropyl methylcellulose, sodium gluconate and appropriate amount of Water, high-speed stirring and mixing, drying, ultrasonic grinding into powder and drying to obtain sugar filter mud powder II; (3) After washing and drying desert sand, add bentonite, red mud and copper tailings, calcin at 670-700℃ and then crush to 120-140 mesh, add carbon black material I, sugar filter mud powder II and other remaining components and mix well, put into a ball mill and ball mill for 2-3 hours, spray water to granulate, age for 2 days and then press into raw brick blanks; (4) Air dry the raw brick blanks naturally, sinter in a box-type resistance furnace at 1060-1100℃ for 1-2 hours, and cool naturally to room temperature before discharge. The compressive strength of the sand-based permeable brick is 47.7MPa, the permeability coefficient is 0.087cm / s, and the water retention is 0.756g / cm2. Under the premise of not affecting the permeability of the brick, the strength and flexural strength of the product are significantly improved, and the raw material utilization rate is high. However, due to the large density difference between carbon black and bentonite, red mud, copper mine tailings, and desert sand, it is not easy to mix them evenly. The technology has not improved how to ensure uniform mixing. Cow dung and sugar filter mud in the brick-making process also need to be carbonized, making the process complex and increasing energy consumption.

[0005] Therefore, there is an urgent need in this field for a brick-making process that can uniformly mix cow dung particles into the brick-making clay while maintaining the strength of the clay bricks and reducing the amount of clay used, in order to replace traditional clay bricks. This has become a key challenge in breaking through the traditional clay brick technology. Summary of the Invention

[0006] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method and device for uniformly mixing cow dung particles into clay bricks, and to solve the technical problem of how to uniformly mix cow dung into clay bricks while maintaining the strength of the clay bricks and reducing the amount of clay used.

[0007] The objective of this invention is achieved by providing a method for uniformly mixing cow dung particles into clay bricks.

[0008] S1. Porous microspheres for sintered clay bricks are prepared by mixing cow dung particles with a light strength modifier to form porous microspheres with a diameter of 0.5 mm to 1.5 mm.

[0009] S2 prepares clay paste by mixing the components of clay bricks according to the specified ratio;

[0010] S3 homogeneously mixing the particles, the pore-forming microspheres are homogeneously mixed into the clay paste to obtain a ball-mixed paste;

[0011] S4 forming the clay brick, one of the clay paste or the ball-mixed paste is formed into an inner core layer, and the other paste is formed into a cladding layer outside the inner core layer, thereby obtaining a clay brick blank;

[0012] S5 sintering the clay brick, the clay brick blank is dried and sintered in a sintering kiln at high temperature to form a clay brick.

[0013] Further, the pore-forming microspheres in step S1 are prepared by the following process:

[0014] S11 ball milling cow dung

[0015] Preparation of dry cow dung; the dry cow dung is sent into a ball mill for crushing and sieving to obtain dung particles;

[0016] S12 preparation of paste fluid

[0017] 20-35wt% light strength modifier mixed with 20-40wt% water to obtain a light strength modifier base fluid, 35-55wt% dung particles are added into the light strength modifier base fluid, stirred for 30 minutes to prepare a paste fluid;

[0018] S13. formation of pore-forming microspheres

[0019] The paste fluid is input into a centrifugal atomization device and is spun out at a certain speed to form liquid droplets, and the liquid droplets form pore-forming microspheres when they fall freely through a hot gas stream.

[0020] Further, the light strength modifier comprises 10-45wt% coated micro powder, 2-5wt% anhydrous calcium chloride, and 55-75wt% binder, the binder is Portland cement or water glass, and the coated micro powder comprises fly ash, blast furnace slag, and volcanic ash.

[0021] A clay brick made by a homogeneously mixing method, a brick machine forms a clay brick blank from a paste, the clay brick blank comprises an inner core layer, a cladding layer, and a plurality of pore-forming microspheres, the inner core layer and the cladding layer each comprise a clay base material, the pore-forming microspheres are uniformly distributed in the clay base material of the inner core layer or the cladding layer so that the clay base material becomes a closed-pore porous structure after high-temperature sintering of the layer, and the porosity of the porous structure is less than or equal to 40%

[0022] A homogeneously mixing device for uniformly mixing pore-forming microspheres into a clay paste in a homogeneously mixing method, comprising

[0023] A concave cavity shell, the concave cavity shell comprises an annular flow channel, and the concave cavity shell is provided with a channel inlet and a channel outlet in communication with the flow channel;

[0024] The paste driving unit drives the clay paste through the flow channel;

[0025] The kneading jet section is rotatably coupled to the flow channel along the same axis. The rotation direction of the kneading jet section is opposite to the movement direction of the clay paste. The perforated microspheres are intermittently injected into the clay paste while the clay paste is kneaded.

[0026] Furthermore, the kneading jet section includes a kneading gear cylinder and a particle injection cylinder that rotate in opposite directions. The particle injection cylinder is disposed in the cylinder cavity of the kneading gear and can rotate in opposite directions. The gap between the particle injection cylinder and the kneading gear is smaller than the diameter of the porous microsphere.

[0027] Furthermore, the concave cavity shell includes a stepped sleeve, the stepped sleeve is provided with an outer bearing seat and an inner bearing seat on the same axis, the particle injection cylinder is rotatably disposed on the inner bearing seat, the kneading toothed cylinder is rotatably disposed on the outer bearing seat, the bottom plate and the cover plate are respectively fastened to the two ends of the stepped sleeve, the bottom plate is provided with a first motor, the cover plate is fixedly provided with a second motor, the kneading toothed cylinder is driven and connected to the first motor, and the particle injection cylinder is driven and connected to the second motor.

[0028] Furthermore, the particle injection cylinder peripheral wall array is provided with multiple injection holes, and the kneading tooth cylinder includes kneading teeth, each of which has at least one radially extending injection outlet, which corresponds to the injection hole.

[0029] Furthermore, the kneading cylinder is provided with multiple sliding kneading parts at intervals along the circumference. The particle injection cylinder rotates in the opposite direction relative to the kneading cylinder, so that the sliding kneading parts slide and extend radially while kneading, and inject the porous microspheres into the clay paste.

[0030] Furthermore, the sliding kneading part includes multiple sliding holes provided in the kneading tooth cylinder, telescopic kneading teeth are provided in the sliding holes, and a return spring and a limiting ball are provided between the telescopic kneading teeth and the sliding holes. The telescopic kneading teeth move between the extended position and the retracted position in the sliding holes. The return spring drives the telescopic kneading teeth back to the retracted position, and the limiting ball prevents the telescopic kneading teeth from falling out of the sliding holes. The telescopic kneading teeth are provided with telescopic injection outlets.

[0031] It also includes a cam, which is sleeved on the outer periphery of the pellet injection tube. The cam has a highest cam point corresponding to the odd-numbered kneading tooth position and a lowest cam point corresponding to the even-numbered kneading tooth position.

[0032] When the pellet ejector rotates in the opposite direction to the kneading tooth cylinder, the highest cam point causes the odd-numbered kneading teeth to extend and knead simultaneously. At the same time, the ejection orifice is aligned with the telescopic ejection outlet of the telescopic kneading tooth. The ejection orifice throws out the porous microspheres to the telescopic ejection outlet, where they are then ejected by the kneading tooth cylinder into the clay paste. Simultaneously, the return spring drives the even-numbered telescopic kneading teeth to return to the retracted position along the cam to the lowest cam point.

[0033] The uniform mixing device and method of the pore-forming microspheres of the present application first uniformly mix the cow dung into the clay paste by making the cow dung into pore-forming microspheres; second, the uniform mixing is realized by kneading the clay paste and spraying the pore-forming microspheres through the forward and reverse rotation of the kneading gear and the spraying barrel; third, the uniform mixing is further realized by kneading the clay paste and spraying the pore-forming microspheres through the extension and retraction of the engaging part and the spraying barrel, and then the uniformly complete closed pores are uniformly distributed in the clay brick, so that the clay brick strength is unchanged and the clay consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The main sectional view of the clay brick of the uniform mixing method of the cow dung particles mixed into the clay brick of the present application;

[0035] Figure 2 The main sectional view of another implementation example of the clay brick of the uniform mixing method of the cow dung particles mixed into the clay brick of the present application;

[0036] Figure 3 The main sectional view of embodiment 1 of the uniform mixing device of the cow dung particles mixed into the clay brick of the present application;

[0037] Figure 4 The particle spraying barrel of embodiment 1 of the uniform mixing device of the cow dung particles mixed into the clay brick of the present application; Figure 3 The A-A sectional view of the particle spraying barrel.

[0038] Figure 5 The state diagram of the spraying hole of embodiment 1 of the uniform mixing device of the cow dung particles mixed into the clay brick of the present application, in which the spraying hole is opposite to the ejection hole.

[0039] Figure 6 The state diagram of the spraying hole of embodiment 1 of the uniform mixing device of the cow dung particles mixed into the clay brick of the present application, in which the spraying hole is located between the two ejection holes.

[0040] Figure 7 The main sectional view of embodiment 2 of the uniform mixing device of the cow dung particles mixed into the clay brick of the present application;

[0041] Figure 8 The particle spraying barrel of embodiment 2 of the uniform mixing device of the cow dung particles mixed into the clay brick of the present application; Figure 7 The enlarged view I of the particle spraying barrel.

[0042] Reference numerals in the above drawings:

[0043] 10 sintered clay brick, 11 inner core layer, 12 cladding layer, 13 clay matrix, 14 pore-forming microspheres, 15 pressure-bearing concave part, 16 inner concave circular arc surface

[0044] 20 housing, 21 flow channel, 22 channel inlet, 23 channel outlet, 24 annular housing, 25 bottom plate, 26 stacking plate, 27 through hole, 28 plug-in cylinder, 29 circular cavity, 30 paste driving part

[0045] 40 kneading jet part, 41 kneading gear, 42 particle barrel, 43 conveying screw, 44 hopper, 45 first motor, 46 second motor, 47 jet hole, 48 kneading tooth, 49 jet outlet

[0046] 50 sliding kneading part, 51 sliding hole, 52 lowest cam point, 53 return spring, 54 limit ball, 56 cam, 57 highest cam point, 58 telescopic kneading tooth, 59 telescopic jet outlet

[0047] 24.1 outer bearing seat, 24.2 inner bearing seat, 42.1 large-diameter barrel part, 42.2 small-diameter barrel part, 42.3 inner recessed bearing seat, 42.4 barrel driving shaft DETAILED DESCRIPTION

[0048] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0049] Embodiment 1

[0050] A uniform mixing method of mixing cow dung particles into clay bricks, comprising the following steps,

[0051] S1, preparing hole-forming microspheres for sintered clay bricks, the hole-forming microspheres are prepared from cow dung particles mixed with a light-strength modifier into hole-forming microspheres with a diameter of 0.5-1.5 mm;

[0052] S2, preparing clay paste, mixing the components of clay bricks according to the proportion to prepare clay paste;

[0053] S3, uniformly mixing particles, the clay paste moves in a flow channel, and the hole-forming microspheres are intermittently sprayed into the clay paste while kneading to obtain ball-mixed paste;

[0054] S4, forming clay bricks, one of the clay paste or the ball-mixed paste is formed into an inner core layer, and the other paste is formed into a cladding layer outside the inner core layer, thereby obtaining clay brick blanks;

[0055] S5, sintering clay bricks, drying the clay brick blanks, and sintering in a sintering kiln at high temperature to form, thereby obtaining clay bricks.

[0056] The hole-forming microspheres of step S1 are prepared by the following process:

[0057] S11, ball milling cow dung

[0058] The collected cow dung is naturally dried, and then dried in an oven at 50-70℃ to obtain dried cow dung, ensuring that the moisture content of the cow dung is less than 7%;

[0059] The dried cow dung is added to a ball mill for crushing and sieving, and the sieve size is greater than or equal to 70 mesh, so that the fecal particles with an average particle size of less than 0.1 mm are obtained;

[0060] S12 Preparation of paste-like fluid

[0061] 20-35wt% light strength modifier mixed with 20-40wt% water to obtain a light strength modifier base fluid, and 35-55wt% fecal particles are added to the light strength modifier base fluid, stirred for 30 minutes to prepare a paste-like fluid;

[0062] S13 Forming of pore-forming microspheres

[0063] The paste-like fluid is input into a centrifugal atomization device and spun out at a certain speed to form droplets by atomization, and the droplets are sprayed into a forming tower, which has a hot gas flow passing through from bottom to top at 100-120℃, ensuring that the height of the microspheres in contact with the hot gas flow is at least 2m, so that the droplets quickly lose moisture to form light-weight reinforced microspheres, and the moisture content of the collected light-weight reinforced microspheres is ensured to be below 10wt%, and the pore-forming microspheres are prepared, and the D90 particle size of the pore-forming microspheres is 0.5-1.5mm.

[0064] The main component of dried cow dung is cellulose, so the pore-forming microspheres will burn to ash during subsequent sintering, making part of the clay matrix into a closed-pore porous structure.

[0065] The light strength modifier includes 10-45wt% coated micro-powder, 2-5wt% anhydrous calcium chloride, and 55-75wt% binder. The binder is Portland cement or water glass, and the coated micro-powder is a light micro-powder that is easy to combine with the clay matrix, including fly ash, blast furnace slag, and volcanic ash, and the average particle size of the coated micro-powder is 0.01-0.1mm. The light strength modifier is packaged in powder form into bags. In the paste-like fluid, the coated micro-powder is adhered to the fecal particles around the binder to form pore-forming microspheres with a suitable particle size when the droplets are atomized.

[0066] A light-weight reinforced sintered clay brick 10 prepared by a uniform mixing method of mixing the cow dung particles into clay bricks. A brick machine makes clay bricks from a paste, and the clay bricks include an inner core layer 11, a coating layer 12, and a plurality of pore-forming microspheres 14. The inner core layer 11 and the coating layer 12 each include a clay matrix 13, and the pore-forming microspheres 14 are uniformly distributed in the clay matrix of the inner core layer 11 or the coating layer 12, so that the clay matrix of the layer becomes a closed-pore porous structure after high-temperature sintering, and the porosity of the porous structure is less than or equal to 40%.

[0067] The clay base material 13 is made of the existing clay brick material formula, but does not contain components that are lost by high-temperature sintering and gasification, such as coal gangue, etc.

[0068] According to the required volume of 5-10wt% or less of the total weight of the clay brick, the pore-forming microspheres are uniformly distributed in the clay base material 13 by the uniform mixing device.

[0069] In order to make the inner core layer 11 have a suitable pressure-bearing structure, the inner core layer 11 includes a pressure-bearing convex part 15, which includes an inner convex arc surface 16 arranged opposite to the upper surface of the sintered clay brick.

[0070] More preferably, in order to enhance the compressive strength, 3-10wt% basalt short fibers are mixed into the clay base material 13 without mixing pore-forming microspheres, which increases the cost but can produce high-strength sintered clay bricks with a strength of MU30 or more, of course, the cost is also increased accordingly.

[0071] When the porosity of the porous structure is less than or equal to 40%, the diameter of the pore-forming microspheres is 0.5mm-1.5mm, and the mechanical properties of the sintered clay brick are hardly affected. Preferably, the porosity is 35-40%, and the diameter of the weight-reducing and reinforcing microspheres is 0.8mm-1mm.

[0072] A method for preparing a weight-reducing and reinforcing sintered clay brick, comprising the following steps:

[0073] Step S1. Clay paste, 65-85wt% clay is added with water to form a paste-like fluid with certain fluidity, and a clay paste is obtained;

[0074] Step S2. Uniformly mixed, 15-35wt% pore-forming microspheres 14 are uniformly mixed into the clay paste by the uniform mixing device 100 to obtain a ball-mixed paste;

[0075] Step S3. Pre-pressing into a blank, the ball-mixed paste and the clay paste are sent into a brick blank forming machine to be compressed and molded into a brick blank;

[0076] Step S4. Natural cooling, the brick blanks are stacked and naturally cooled for 3-5 days to ensure that the brick blanks are in a semi-dry state, preventing internal micro-cracks during sintering in the brick kiln;

[0077] Step S4. Sintering, the brick blanks are stacked in a sintering kiln, heated to 100℃ at a rate of 20℃ / hour, heated to 1100-1200℃ at a rate of 100℃ / hour, kept at a constant temperature for 3-5 hours, stopped heating, and naturally cooled in the sintering kiln for 1-2 days, and then pulled out of the sintering kiln.

[0078] Step S3 further comprises the following steps:

[0079] One of the mixed green clay or the green clay is sent into the first mold, the mold base is fixed, the first mold is buckled on the mold base to press the sent green clay into the inner core layer 11, and the inner core layer 11 is arranged on the mold base;

[0080] The first mold is removed, the second mold is buckled on the mold base, the inner core layer 11 is used as an embedded part of the second mold, and the other of the mixed green clay or the green clay is sent into the second mold to press the coating layer 12 outside the inner core layer 11 to form a green brick.

[0081] Compared with the same size of the ordinary sintered clay brick, the inner core layer 11 or the coating layer 12 is a closed pore type porous structure, and the compressive strength is not reduced, so that the compressive strength of the sintered clay brick is greater than or equal to that of the ordinary sintered clay brick, and the weight is reduced by 10%-25%, that is, the 10%-25% of the clay filled place is replaced by the pore-forming microsphere 14, which becomes a closed pore structure after sintering.

[0082] Since the pore-forming microsphere is a cohesive particle and a non-sintered particle, the strength is limited. The mixing can be realized by stirring, but most of the stirring blades will be broken into powder and mixed in the clay paste, which affects the closed pore structure of the closed pore type porous structure. In order to enhance the mixing property and the closed pore structure, the following improvements are made.

[0083] An even mixing device 100 for uniformly mixing the pore-forming microsphere into the clay paste, comprising

[0084] A shell 20, the shell 20 comprising a ring-shaped flow channel 21, the shell 20 being provided with a channel inlet 22 and a channel outlet 23 in communication with the flow channel 21;

[0085] A paste driving part 30, the paste driving part 30 driving the clay paste to move in the flow channel 21;

[0086] A kneading jet part 40, the kneading jet part 40 being coaxially rotatable in the flow channel 21, the rotation direction of the kneading jet part 40 being opposite to the moving direction of the clay paste, and the pore-forming microsphere being intermittently injected into the clay paste while the clay paste is kneaded.

[0087] The concave cavity shell 20 comprises a stepped sleeve 24 and a conveying sleeve 25, the stepped sleeve 24 comprising a large-diameter sleeve part, a small-diameter sleeve part and a transition top wall integrally connecting the two, the stepped sleeve 24 being provided with an outer bearing seat 24.1 and an inner bearing seat 24.2 coaxial with each other, and the conveying sleeve 25 being sleeved on the small-diameter sleeve part.

[0088] The kneading jet part 40 comprises a kneading gear cylinder 41 and a particle jet cylinder 42 which rotate in opposite directions, the particle jet cylinder 42 is rotatably arranged in the inner bearing seat 24.2, the kneading gear cylinder 41 is rotatably arranged in the outer bearing seat 24.1, the particle jet cylinder 42 is reversibly rotatably arranged in the cylinder cavity of the kneading gear cylinder 41, the clearance δ between the particle jet cylinder 42 and the kneading gear cylinder 41 is less than the diameter of the porous microspheres. The bottom plate 26 and the cover plate 27 are respectively buckled on both ends of the stepped sleeve 24, the bottom plate 26 is provided with a first motor 45, the cover plate 27 is fixedly provided with a second motor 46, the kneading gear cylinder 41 is drivingly connected with the first motor 45, and the particle jet cylinder 42 is drivingly connected with the second motor 46.

[0089] Specifically, the left end of the kneading gear cylinder 41 is fixedly connected with a cylinder driving shaft, the driving end of the cylinder driving shaft is coupled and connected with the first motor 45 through a shaft coupling; the particle jet cylinder 42 comprises a large-diameter cylinder body part 42.1 and a small-diameter cylinder body part 42.2, the bottom wall of the large-diameter cylinder body part is provided with an inner recess bearing seat 42.3 and a jet cylinder driving shaft 42.4 extending to one side of the small-diameter cylinder body part 42.2 along the rotation axis, the cover plate 27 is fixedly installed with the second motor 46 along the rotation axis, the second motor 46 is drivingly connected with the jet cylinder driving shaft 42.4 through a shaft coupling, and the free end of the cylinder driving shaft is rotatably arranged in the inner recess bearing seat 42.3.

[0090] The small-diameter sleeve part of the stepped sleeve 24 is sleeved with a material conveying sleeve 25, a conveying screw 43 is arranged between the material conveying sleeve 25 and the jet cylinder driving shaft, the conveying screw 43 is drivingly connected with the jet cylinder driving shaft through a planetary gear reducer, and the material conveying sleeve 25 is provided with a hopper 44 at the top.

[0091] The coaxiality of the outer bearing seat 24.1 and the inner bearing seat 24.2 is less than or equal to 0.02 mm, and the cover plate 26 is coaxially buckled on the large-diameter sleeve part through a conical fitting part.

[0092] The circumferential wall of the particle jet cylinder 42 is arranged with a plurality of jet holes 47, the jet holes 47 are arranged in multiple columns with a column distance Cs in the circumferential direction, and are arranged in multiple rows with a row distance RS in the axial direction.

[0093] The kneading gear cylinder 41 comprises kneading teeth 48, the kneading teeth 48 are provided with at least one radial jet outlet 49 corresponding to the jet hole 47. The particle jet cylinder 42 can reversely rotate relative to the kneading gear cylinder 41 at a certain speed, when a certain column of jet holes 47 is opposite to the jet outlet 49 of a certain kneading tooth 48, the porous microspheres in the column of jet holes 47 are jetted out of the jet outlet 49, so as to be thrown out of the clay paste by the kneading gear cylinder 41; when the column of jet holes 47 continues to rotate to between the jet outlets of the two kneading teeth 48, the porous microspheres will not be jetted out of the jet hole 47.

[0094] The channel outlet 23 is at an angle of 270 degrees with the channel inlet 22.

[0095] Example 2

[0096] The means for improving the uniform mixing of the porous microspheres into the clay matrix is the same as in Example 1.

[0097] A uniform mixing device 200 for porous microspheres, comprising

[0098] The kneading jet part 40 comprises a kneading tooth cylinder 41 and a particle jet cylinder 42 rotating in opposite directions, the kneading tooth cylinder 41 is provided with a plurality of sliding kneading parts 50 spaced along the circumference, and the particle jet cylinder 42 rotates in the opposite direction relative to the kneading tooth cylinder 41 so that the sliding kneading parts 50 slide radially to perform the retractable kneading while ejecting the porous microspheres into the clay paste;

[0099] The sliding kneading part 50 comprises a plurality of sliding holes 51 provided in the kneading tooth cylinder 41, a retractable kneading tooth 58 is arranged in the sliding hole 51, a return spring 53 and a limiting ball 54 are arranged between the retractable kneading tooth and the sliding hole, the retractable kneading tooth 58 moves between the extended position and the retracted position in the sliding hole 51, the return spring 53 drives the retractable kneading tooth 58 to return to the retracted position, and the limiting ball 54 limits the retractable kneading tooth 58 from being pulled out of the sliding hole; the retractable kneading tooth 58 is provided with a retractable ejection hole 59;

[0100] The outer periphery of the particle jet cylinder 42 is provided with a cam 56, the cam 56 is provided with a highest cam point 57 corresponding to the odd-numbered kneading tooth position and a lowest cam point 52 corresponding to the even-numbered kneading tooth position;

[0101] When the particle jet cylinder 42 rotates in the opposite direction relative to the kneading tooth cylinder 41, the highest cam point 57 of the cam 56 causes the odd-numbered retractable kneading tooth 58 to extend and knead at the same time, and the ejecting hole 47 is directly opposite the retractable ejection hole 59 of the retractable kneading tooth 58, the ejecting hole 47 in this row ejects the porous microspheres to the retractable ejection hole 59, so that the porous microspheres are ejected into the clay paste; at the same time, the return spring 53 drives the even-numbered retractable kneading tooth 53 to return to the retracted position along the cam to the lowest cam point 52.

[0102] The uniform mixing method and device of the present application solves the technical problem of how to uniformly mix cow dung particles into brick clay, reduces the amount of clay used without changing the strength of clay bricks, and replaces traditional clay bricks.

[0103] (1) First, the cow dung is made into porous microspheres, which are uniformly mixed into the clay paste.

[0104] The cow dung is made into porous microspheres, which are mixed into the clay paste to form a mixed brick body. The porous microspheres are vaporized and removed during the sintering of the mixed brick body, forming a closed pore structure. The porous microspheres are uniformly mixed into the clay paste by the uniform mixing device, rather than by stirring the raw materials, because the strength of the porous microspheres is low and stirring can break them.

[0105] (2) knead the clay slurry while uniformly mixing the hole-forming microspheres, to achieve uniform mixing.

[0106] The kneading jet part kneads the clay slurry through the rotating kneading gear 41, and at the same time, the particle injection barrel 42 inside the kneading gear 41 is set to rotate in the opposite direction to form the interval alignment of the injection hole and the ejection hole, so as to realize the intermittent injection of the hole-forming microspheres into the clay slurry.

[0107] (3) The fluidized batcher cooperates with the stream divider-combiner to uniformly mix the hole-forming microspheres into the clay slurry, to achieve uniform mixing.

[0108] The kneading gear 41 is set with the particle injection barrel 42 rotating in the opposite direction to form the interval alignment of the injection hole and the ejection hole, so as to realize the intermittent injection of the hole-forming microspheres into the clay slurry. On the basis of this idea, the kneading teeth are further designed as the telescopic engagement part 50 driven by the cam, and the particle injection barrel 42 is set with the cam 56, and the highest cam point 57 is used to make the odd-numbered kneading teeth 53 extend for kneading at the same time, and the particle injection barrel 42 throws the hole-forming microspheres to the telescopic ejection outlet 49 and is thrown into the clay slurry; at the same time, the reset spring 53 drives the even-numbered telescopic kneading teeth 53 to return to the retracted position along the cam to the lowest cam point 52.

[0109] The hole-forming microsphere uniform mixing device and method of the present application first uniformly mixes the hole-forming microspheres made of cow dung into the clay slurry; secondly, through the forward and reverse rotating kneading gear 41 and the injection barrel 42, the hole-forming microspheres are injected while the clay slurry is kneaded to achieve uniform mixing; thirdly, the telescopic engagement part cooperates with the injection barrel to further realize the uniform mixing of the hole-forming microspheres while the clay slurry is kneaded, and then the uniformly distributed closed pores in the clay brick are obtained, so that the strength of the clay brick is unchanged while the clay consumption is reduced.

Claims

1. A method for homogeneously mixing cow dung particles into clay bricks, characterized in that, S1. Preparing pore-forming microspheres for sintered clay bricks, the pore-forming microspheres are prepared from cow dung particles mixed with light-weight modifier into pore-forming microspheres with a diameter of 0.5-1.5 mm; the pore-forming microspheres of step S1 are prepared by the following process: S11. Ball-milling cow dung Preparing dried cow dung; sending the dried cow dung into a ball mill for crushing and sieving to obtain dung particles; S12. Preparing paste-like fluid Mixing 20-40 wt% water into 20-35 wt% light-weight modifier to obtain light-weight modifier base fluid, adding the light-weight modifier base fluid into 35-55 wt% dung particles, stirring for 30 minutes to prepare paste-like fluid; S13. Forming pore-forming microspheres Inputting the paste-like fluid into a centrifugal atomization device and spinning out atomized droplets from the centrifugal atomization device at a certain speed, the droplets form pore-forming microspheres when falling freely through a hot gas stream; S2. Preparing clay paste, mixing clay brick components according to a ratio to prepare clay paste; S3. Homogeneously mixing particles, uniformly mixing the pore-forming microspheres into the clay paste to obtain ball-mixed paste; S4. Forming clay bricks, forming one of the clay paste or the ball-mixed paste into an inner core layer, and forming the other paste into a cladding layer outside the inner core layer to obtain clay brick blanks; S5. Sintering clay bricks, drying and sintering the clay brick blanks in a sintering kiln to form sintered clay bricks.

2. The method of claim 1, wherein the cattle dung particles are mixed with the clay bricks uniformly. The light-weight modifier comprises 10-45 wt% coated micro-powder, 2-5 wt% anhydrous calcium chloride, and 55-75 wt% binder, the binder is silicate cement or water glass, and the coated micro-powder comprises fly ash, blast furnace slag, and volcanic ash.

3. The clay brick prepared by the homogeneously mixing method of any one of claims 1-2, a brick machine forms the paste into clay brick blanks, the clay brick blanks comprise an inner core layer (11), a cladding layer (12), and a plurality of pore-forming microspheres (14), the inner core layer (11) and the cladding layer (12) each comprise clay base material (13), and the pore-forming microspheres (14) are uniformly dispersed in the clay base material of the inner core layer (11) or the cladding layer (12) so that the clay base material of the layer becomes a closed-pore porous structure after high-temperature sintering, and the porosity of the porous structure is less than or equal to 40%.

4. A device for achieving uniform incorporation of microspheres into a clay slip in a method of uniform incorporation according to any one of claims 1 to 2, wherein, comprising a concave cavity shell (20) comprising an annular flow channel (21), the concave cavity shell (20) being provided with a channel inlet (22) and a channel outlet (23) communicating with the flow channel (21); a paste driving part (30) for driving the clay paste to pass through the flow channel (21); a kneading jet part (40) coaxially coupled with the flow channel (21) and rotating in a direction opposite to the moving direction of the clay paste, the kneading jet part (40) intermittently jets the pore-forming microspheres into the clay paste while kneading the clay paste.

5. The apparatus of claim 4, wherein the means for homogenizing comprises a means for stirring. The kneading jet part (40) comprises a kneading tooth cylinder (41) and a particle jet cylinder (42) rotating in opposite directions, the particle jet cylinder (42) is rotatably arranged in the cylinder cavity of the kneading tooth cylinder (41), and the gap between the particle jet cylinder (42) and the kneading tooth cylinder (41) is smaller than the diameter of the porous microspheres.

6. The apparatus of claim 5, wherein the means for homogenizing comprises a means for stirring. The concave cavity shell (20) comprises a stepped sleeve (24) provided with coaxial outer and inner bearing seats (24.1 and 24.2), the particle jet cylinder (42) is rotatably arranged in the inner bearing seat (24.2), the kneading tooth cylinder (41) is rotatably arranged in the outer bearing seat (24.1), the bottom plate (26) and the cover plate (27) are respectively buckled at the two ends of the stepped sleeve (24), the bottom plate (26) is provided with the first motor (45), the cover plate (27) is fixedly provided with the second motor (46), the kneading tooth cylinder (41) is drivingly connected with the first motor (45), and the particle jet cylinder (42) is drivingly connected with the second motor (46).

7. The device of claim 5, wherein the means for homogenizing comprises a means for stirring. The particle jet cylinder (42) is provided with a plurality of jet holes (47) in the array of the peripheral wall, the kneading tooth cylinder (41) comprises kneading teeth (48) provided with at least one radial jet outlet (49) corresponding to the jet hole (47).

8. The apparatus of claim 6, wherein the means for homogenizing comprises a means for stirring. The kneading tooth cylinder (41) is provided with a plurality of sliding kneading parts (50) at intervals in the circumferential direction, and the reverse rotation of the particle jet cylinder (42) relative to the kneading tooth cylinder (41) causes the sliding kneading part (50) to radially slide and stretch to achieve kneading while the porous microspheres are ejected into the clay paste.

9. The device of claim 8, wherein the means for homogenizing comprises a means for stirring. The sliding kneading part (50) comprises a plurality of sliding holes (51) arranged in the kneading tooth cylinder (41), the sliding hole (51) is provided with a stretchable kneading tooth (58), the stretchable kneading tooth (58) and the sliding hole (51) are provided with a reset spring (53) and a limiting ball (54), the stretchable kneading tooth (58) moves between the extended position and the retracted position in the sliding hole (51), the reset spring (53) drives the stretchable kneading tooth (58) to return to the retracted position, and the limiting ball (54) limits the stretchable kneading tooth (58) from being pulled out of the sliding hole; the stretchable kneading tooth (58) is provided with a stretchable jet outlet (59). Further comprising a cam (56) sleeved on the outer periphery of the particle jet cylinder (42), the cam (56) is provided with a highest cam point (57) corresponding to the odd-numbered stretchable kneading tooth position and a lowest cam point (52) corresponding to the even-numbered stretchable kneading tooth position. When the particle jet cylinder (42) rotates in the opposite direction relative to the kneading tooth cylinder (41), the highest cam point (57) causes the odd-numbered stretchable kneading tooth (58) to extend and knead, and the jet hole (47) is opposite to the stretchable jet outlet (59) of the stretchable kneading tooth (58), the jet hole (47) throws the porous microspheres to the stretchable jet outlet (59), so that the stretchable kneading tooth (58) is thrown out of the kneading tooth cylinder (41) into the clay paste; at the same time, the reset spring (53) drives the even-numbered stretchable kneading tooth (58) to return to the retracted position along the cam to the lowest cam point (52).

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