CN113149622B - Preparation method of lining for microcrystalline alumina high-temperature rotary kiln - Google Patents
Preparation method of lining for microcrystalline alumina high-temperature rotary kiln Download PDFInfo
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- CN113149622B CN113149622B CN202110595547.0A CN202110595547A CN113149622B CN 113149622 B CN113149622 B CN 113149622B CN 202110595547 A CN202110595547 A CN 202110595547A CN 113149622 B CN113149622 B CN 113149622B
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- C04B35/101—Refractories from grain sized mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The invention relates to a preparation method of a lining for a microcrystalline alumina high-temperature rotary kiln, belonging to the technical field of preparation of refractory materials for high-end smelting of microcrystalline alumina and aluminum. The method is characterized by comprising the following steps: weighing raw materials, mixing, adding water, stirring, pouring and molding, and baking at low temperature to be molded. The invention fully utilizes corundum and mullite as main raw materials, adds part of additives as auxiliary raw materials, and pours the mixture into a prefabricated part, mainly solves the problems that refractory materials are high-temperature resistant and are not eroded and abraded, the volume change of hot and cold states is small, the service life of a rotary kiln lining is low and the like in a high-temperature alumina rotary kiln with harsh microcrystalline alumina calcination conditions, and prepares the high-performance rotary kiln prefabricated part lining. The rotary kiln prefabricated part lining prepared by the invention has the characteristics of good wear resistance, good corrosion resistance and small volume change at high temperature in the new field of microcrystalline alumina calcination, solves the problems of short service life, frequent lining replacement and the like in the use process, correspondingly reduces the labor intensity and improves the production efficiency.
Description
Technical Field
The invention belongs to the technical field of preparation of microcrystalline alumina and refractory materials for high-end aluminum smelting, and particularly relates to a preparation method of a lining for a microcrystalline alumina high-temperature rotary kiln.
Background
At present, alumina calcining, lime and pellet rotary kilns are more at home, and alumina-silica sintered bricks or prefabricated parts are generally adopted as linings, microcrystalline alumina calcining in the new field just begins, corresponding matched refractory materials of a high-temperature rotary kiln for calcining microcrystalline alumina must be caught up, and under the condition of high temperature of alumina calcining, strict requirements on the high-temperature performance and components of the refractory materials in the reaction atmosphere of the kiln lining are required, so that the corresponding design is required when the refractory material configuration is set. The working lining is abraded seriously under the scouring of high-temperature airflow and alumina, and the abraded refractory material cannot pollute the purity of the microcrystalline alumina. Therefore, a rotary kiln lining refractory material with good erosion resistance and scouring resistance and high alumina content is needed to solve the problems and is also suitable for the trend of the national environmental protection and energy conservation policy. In order to improve the erosion resistance and the scouring resistance of the rotary kiln lining, corundum and mullite materials are designed for composite prefabrication.
Disclosure of Invention
The invention aims to solve the problems, provides the preparation method of the lining for the microcrystalline alumina high-temperature rotary kiln, can prepare the lining of the rotary kiln by utilizing high-purity tabular corundum and mullite, has the characteristics of high temperature resistance, corrosion resistance, good wear resistance and no ring formation, solves the problems of non-corrosion resistance, low scouring service life, small pollution and the like of the lining of the microcrystalline alumina high-temperature rotary kiln, and improves the production efficiency; in addition, the influence of abrasion of the refractory material on the microcrystalline alumina product in the using process can be further taken into full consideration in the preparation process, so that the plate-shaped corundum and the mullite are mixed and compounded according to certain components, and the prefabricated parts of the two components are matched at the position of the high-temperature rotary kiln.
The invention relates to a preparation method of a liner for a microcrystalline alumina high-temperature rotary kiln, which is characterized by comprising the following steps of:
(1) weighing and preparing raw materials;
(2) uniformly mixing the prepared raw materials in a mixing roll, adding water accounting for 4-6wt% of the total weight of the raw materials, and uniformly stirring at the normal temperature of 5-25 ℃;
(3) pouring and forming the mixed material which is stirred by adding water in a model of an automatic pouring machine to obtain a blank;
(4) the blank is shaped through a low-temperature baking machine and then is conveyed to a demoulding mechanism for demoulding operation;
wherein the raw materials in the step (1) comprise the following components in percentage by mass:
10-20wt% of tabular corundum particles with the particle size of 10-5 mm;
10-20wt% of tabular corundum particles with the particle size of 5-3 mm;
10-20wt% of mullite grains with the grain diameter of 3-1 mm;
5-15wt% of tabular corundum particles with the particle size of 1-0 mm;
5-10wt% of mullite grains with grain diameter of 1-0mm
5-10wt% of mullite fine powder with the fineness of 200 meshes;
5-10wt% of tabular corundum fine powder with the fineness of 200 meshes;
2-6wt% of composite micro powder;
2-6wt% of a binder.
Preferably, the plate-shaped corundum particles and the fine powder comprise the following chemical components in percentage by mass:
Al 2 O 3 90-99wt%；
1-10% by weight of the others.
Preferably, the mullite grains and the fine powder comprise the following chemical components in percentage by mass:
Al 2 O 3 60-75wt%；
SiO 2 20-35wt%；
1-5wt% of others.
Preferably, the composite micro powder comprises the following components in percentage by mass:
α- Al 2 O 3 3 to 10 weight percent of micro powder,
1 to 5 weight percent of silicon micro powder,
5-15wt% of high-efficiency polycarboxylic acid water reducing agent or tripolyphosphate or hexametaphosphate.
Preferably, the binding agent is aluminate cement.
Preferably, the low-temperature baking in the step (4) is 400 ℃.
Preferably, the demolding mechanism comprises a demolding frame, a feeding function part, a demolding function part and a distributing function part, wherein the feeding function part, the demolding function part and the distributing function part are sequentially installed on the demolding frame from front to back, and an upper material bearing station of the feeding function part is connected with a discharge end conveying belt of the low-temperature baking machine; the lower material bearing station of the feeding functional part, the demoulding functional part and the lower material distributing station of the material distributing functional part are connected through a lower conveying belt; the upper distributing station of the distributing function part is connected with the upper conveyer belt.
Preferably, the feeding function part comprises a front overturning conveying device, the front overturning conveying device comprises a front overturning driving device, a front overturning arm and a front overturning sucker, the front overturning driving device is installed at the front end of the demoulding rack, the front overturning driving device is connected with the front overturning arm, and the front overturning sucker is installed on the front overturning arm; when the front overturning arm is driven by the front overturning driving device to reach the uppermost end, the front overturning arm reaches the upper material bearing station, and the front overturning sucker faces to the right upper side; when the front overturning arm is driven by the front overturning driving device to reach the lowest end, the front overturning arm reaches the lower material bearing station, and the front overturning sucker faces to the right lower side;
a material bearing slow-falling device is arranged at an upper material bearing station and is arranged on the demoulding rack; the material bearing slow-falling device comprises a left material bearing support arm and a right material bearing support arm, the left material bearing support arm and the right material bearing support arm are respectively installed on the demoulding rack, the upper end of the right side of the left material bearing support arm is hinged with a left spring clamping arm, the upper end of the left side of the right material bearing support arm is hinged with a right spring clamping arm, a left slow-falling support spring is arranged between the left material bearing support arm and the left spring clamping arm, and a right slow-falling support spring is arranged between the right material bearing support arm and the right spring clamping arm; after a model containing blanks is conveyed to a position between the left material bearing support arm and the right material bearing support arm along a discharge end conveying belt of the low-temperature baking machine, the model can slowly descend along the left spring clamping arm and the right spring clamping arm under the action of self gravity until the lower bottom surface of the model is contacted with a front overturning sucker waiting at a material bearing station, and the front overturning sucker can firmly adsorb the lower bottom surface of the model;
the front overturning driving device drives the front overturning arm to rotate, the front overturning sucker drives the model and the blank inside the model to overturn for 180 degrees until reaching the lower material bearing station, and then the front overturning sucker releases the model to enable the model, namely the blank, to fall onto the lower conveying belt.
Preferably, the demolding function part comprises a lower lifting device, an upper clamping device and a rotary hammer type striking device;
the lower conveying belt comprises more than three conveying belt bodies, belt body gaps are formed among the conveying belt bodies, the lower lifting device comprises at least three lifting cylinders, each lifting cylinder is arranged at the lower part of each belt body gap, a lifting arm of each lifting cylinder can penetrate through the belt body gap to lift upwards, and the upper end of each lifting arm is connected with a lifting plate;
an upper clamping device is arranged above the lower conveyor belt and is positioned right above each lifting plate; the upper clamping device comprises a clamping arm mounting beam, a left spring clamping jaw and a right spring clamping jaw are respectively arranged at two ends of the clamping arm mounting beam, and the left spring clamping jaw and the right spring clamping jaw respectively comprise a group of clamping functional bodies; the clamping function body comprises a reversed-L-shaped spring support arranged above a clamping arm mounting beam end plate, the upper end of a clamping spring is fixed at the lower part of a cross arm of the spring support, the lower end of the clamping spring is connected with the upper end of a large arc arm, the middle part of the large arc arm is hinged on the clamping arm mounting beam, and a large rubber anti-falling roller is arranged at the lower end of the large arc arm; the middle part of the small arc arm is hinged on the clamping arm mounting beam at the inner side of the large arc arm, the upper end of the small arc arm abuts against the inner side wall at the upper end of the large arc arm, and the lower end of the lower protective plate is provided with a small rubber anti-falling roller; the arc openings of the large arc arm and the small arc arm are oppositely arranged; when the lifting cylinder drives the lifting arm and the lifting plate to pass through each conveying belt body to ascend, the model and the blank are lifted, when the model is in contact with the small rubber anti-falling idler wheel at the lower end of the small arc arm and the small arc arm is turned upwards around the hinge shaft, the upper end of the large arc arm can be jacked upwards by the upper end of the small arc arm, and the outer wall of the model can be clamped by the lower end of the large arc arm in a inwards rotating mode;
a motor mounting frame is vertically arranged at the upper part of the clamping arm mounting beam and is fixed at the middle part of the demoulding rack; a demoulding motor is fixed on the motor mounting frame, a motor shaft of the demoulding motor is sleeved with a rotating wheel, more than three demoulding hammer arms are annularly arranged on the periphery of the rotating wheel, and the extending end of each demoulding hammer arm is connected with a steel hammer through a hammering spring; after the demoulding motor is started, the rotating wheel can be driven to rotate around the motor shaft, and each steel hammer head is driven to strike the mould in turn until the blank is loosened in the mould and demoulding is carried out.
Preferably, the material distribution function part comprises a rear overturning conveying device, the rear overturning conveying device comprises a rear overturning driving device, a rear overturning arm and a rear overturning sucker, the rear overturning driving device is installed at the front end of the demoulding rack, the rear overturning driving device is connected with the rear overturning arm, and the rear overturning arm is provided with the rear overturning sucker; when the rear overturning driving device drives the rear overturning arm to reach the uppermost end, the rear overturning arm reaches the upper material distributing station, and the rear overturning sucker faces to the right upper side; when the rear overturning driving device drives the rear overturning arm to reach the lowest end, the rear overturning arm reaches the lower material distribution station, and the rear overturning sucker faces to the right lower side; an electric ejector rod is arranged on the left side of the upper material distributing station, and an upper conveyor belt is arranged on the right side of the upper material distributing station in a connected mode;
when loosened blanks and models are conveyed to a lower material distribution station along a lower conveying belt, a rear overturning sucker waiting at the lower material distribution station can adsorb the models and drive the models to overturn for 180 degrees to the upper material distribution station, and an electric ejector rod is started to push the models to the upper conveying belt; at the moment, the blanks left on the lower conveyor belt after demoulding can be conveyed to a packaging position along the lower conveyor belt to be collected and packaged.
Preferably, the front overturning driving device and the rear overturning driving device both comprise a group of overturning functional bodies; the turnover function body comprises a fixed vertical plate which is vertically arranged, a guide rail vertical plate is fixed on the upper part of the fixed vertical plate, and a 'shape reversing guide groove' is formed in the guide rail vertical plate;
the front turning arm and the rear turning arm respectively comprise a first connecting rod, a second connecting rod and a third connecting rod; a guide sliding block is inserted in the reversing guide groove, the extending end of the guide sliding block is vertically connected with one end of a first connecting rod, the other end of the first connecting rod is vertically connected with one end of a second connecting rod, the other end of the second connecting rod is vertically connected with a third connecting rod, the other end of the third connecting rod is fixedly connected with a front overturning sucker or a rear overturning sucker, and the front overturning sucker and the rear overturning sucker are both electric suckers;
a horizontally arranged support plate is vertically fixed in the middle of the fixed vertical plate, and a lifting guide hole is formed in the support plate; a connecting rod sleeve is sleeved on the second connecting rod, and the second connecting rod can freely rotate in the connecting rod sleeve; the upper end of an upper lifting driving rod is vertically fixed at the lower part of the connecting rod sleeve, the lower end of the upper lifting driving rod is hinged with the upper end of a middle lifting driving rod after penetrating through a lifting guide hole, the lower end of the middle lifting driving rod is hinged with the upper end of a lower lifting driving rod, the lower end of the lower lifting driving rod is hinged on an electrode shaft of a driving motor, and the driving motor is installed at the lower part of the fixed vertical plate;
when the driving motor drives the lower lifting driving rod to rotate, the upper lifting driving rod can be driven by the middle lifting driving rod to vertically move up and down along the lifting guide hole, the upper lifting driving rod drives the second connecting rod to vertically move up and down through the connecting rod sleeve, and meanwhile, the guide sliding block is enabled to move along the reversing guide groove; when the guide slide block is positioned at the lower limit position in the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces downwards, and meanwhile, the front overturning sucker or the rear overturning sucker also faces downwards; when the guide slide block is positioned at the left convex part of the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces towards the right side, and meanwhile, the front overturning sucker or the rear overturning sucker also faces towards the right side; when the guide slide block is positioned at the upper limit position in the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces upwards, and meanwhile, the front overturning sucker or the rear overturning sucker also faces upwards; therefore, the front overturning driving device and the rear overturning driving device can adsorb materials and overturn 180 degrees.
The beneficial effects are as follows:
compared with the prior art, the invention has the beneficial effects that:
1. the high-temperature microcrystalline alumina rotary kiln prefabricated part prepared by the process can be mixed with a castable of the same material to be built as a rotary kiln lining, has good erosion resistance and wear resistance and high purity, and improves the service life and production efficiency of the rotary kiln.
2. In the preparation process, because the refractory material is worn in the using process to influence the microcrystalline alumina product, the plate-shaped corundum and the mullite are mixed and compounded according to certain components and the prefabricated parts of the two components are matched at the position of the high-temperature rotary kiln.
3. The process of the invention adopts reasonable raw material proportion, adopts a plurality of raw material mixed ingredients with various particle sizes and fineness, and aims to realize reasonable particle size distribution, form closest packing, reduce porosity and form a compact structure.
The composite micro powder involved in the process has the effects of filling particle gaps, improving the fluidity of the casting material, forming ceramic combination at high temperature to generate high-temperature strength, and simultaneously forming a compact reaction layer structure to prevent liquid phase permeation; in the composite micropowder, alpha-Al 2 O 3 The micro powder has the function of filling gaps of particles, and is high in activity and easy to sinter at high temperature; the function of adding the high-efficiency polycarboxylic acid water reducing agent or the tripolyphosphate or the hexametaphosphate is to disperse the micro powder, reduce the water adding amount, reduce air holes and improve the compactness of the material; the composite micro powder is organically combined with each component of the composite micro powder, so that the high-temperature sintering performance of the material can be improved.
4. According to the invention, the demolding mechanism is arranged, so that the baked and dried blank can be automatically demolded, and the model and the blank are conveyed and collected in a classified manner. The demoulding mechanism can forward carry the low-temperature baking process, integrates the functions of conveying, demoulding and classified conveying, does not need manual participation of workers in the process, reduces the labor intensity and simultaneously improves the production efficiency.
Drawings
FIG. 1 is a schematic view of the installation structure of a low-temperature roaster and a demoulding mechanism;
FIG. 2 is a schematic structural diagram of a feeding function part of the demolding mechanism;
FIG. 3 is a schematic structural view of a mold releasing function part of the mold releasing mechanism;
fig. 4 is a schematic structural view of a material distributing function part of the demoulding mechanism;
FIG. 5 is a schematic structural view of the turning functional body (when the guide slider is located at the upper limit position in the reversing guide groove);
FIG. 6 is a schematic structural view of the turning functional body (when the guide slider is located at the left convex portion of the reversing guide slot);
FIG. 7 is a schematic structural view of the turning functional body (when the guide slider is located at the lower limit position in the reversing guide groove);
in the figure: 1. a low temperature roaster; 2. a discharge end conveyer belt;
3. a feeding function part; 3.1, a left spring clamping arm; 3.2, a left material bearing support arm; 3.3, slowly descending the supporting spring leftwards; 3.4, a right spring clamping arm; 3.5, a right material bearing support arm; 3.6, slowly descending the supporting spring rightwards; 3.7, turning over the sucker in front; 3.8, turning the arm forwards; 3.9, a front overturning driving device;
4. a mold release function section; 4.1, rotating wheels; 4.2, a steel hammer head; 4.3, a motor mounting rack; 4.4, hammering the spring; 4.5, demoulding the hammer arm; 4.6, mounting a beam by using the clamping arm; 4.7, a right spring jaw; 4.8, a spring support; 4.9, clamping a spring; 4.10, a large arc arm; 4.11, a small arc arm; 4.12, a large rubber anti-drop roller; 4.13, a small rubber anti-drop roller; 4.14, lifting plates; 4.15, lifting arms; 4.16, a left spring jaw;
5. a material distributing function part; 5.1, an electric ejector rod; 5.2, turning over the sucker; 5.3, backward turning arm; 5.4, a rear overturning driving device;
6. uploading a conveyor belt; 7. a model; 8. a blank;
9. turning over the functional body; 9.1, a guide rail vertical plate; 9.2, fixing the vertical plate; 9.3, a guide slide block; 9.4, a connecting rod sleeve; 9.5, a third connecting rod; 9.6, a second connecting rod; 9.7, a first connecting rod; 9.8, lifting and descending the driving rod; 9.9, a middle lifting driving rod; 9.10, a lower lifting driving rod is arranged; 9.11, driving a motor; 9.12, a support plate; 9.13, lifting guide holes; 9.14, a reversing guide groove;
10. and (5) a lower conveyor belt.
Detailed Description
The present invention will be further described with reference to specific examples, which are not intended to limit the invention.
Example 1
The invention relates to a preparation method of a plate-shaped corundum and mullite composite prefabricated part lining for a high-temperature microcrystalline alumina rotary kiln, which comprises the following steps of:
(1) weighing and preparing raw materials;
(2) uniformly mixing the prepared raw materials, adding water accounting for 4-6wt% of the total weight of the raw materials, and uniformly stirring at the normal temperature of 5-25 ℃;
(3) pouring and forming the mixed material which is stirred by adding water in a model to obtain a blank;
(4) the blank is shaped through a low-temperature baking machine and then is conveyed to a demoulding mechanism for demoulding operation;
wherein the raw materials in the step (1) comprise the following components in percentage by mass:
10-20wt% of tabular corundum particles with the particle size of 10-5 mm;
10-20wt% of tabular corundum particles with the particle size of 5-3 mm;
10-20wt% of mullite grains with the grain diameter of 3-1 mm;
5-15wt% of tabular corundum particles with the particle size of 1-0 mm;
5-10wt% of mullite grains with grain diameter of 1-0mm
5-10wt% of mullite fine powder with the fineness of 200 meshes;
5-10wt% of tabular corundum fine powder with fineness of 200 meshes;
2-6wt% of composite micro powder;
2-6wt% of a binder.
Preferably, the plate-shaped corundum particles and the fine powder comprise the following chemical components in percentage by mass:
Al 2 O 3 90-99wt%；
1-10% by weight of the others.
Preferably, the mullite grains and the fine powder comprise the following chemical components in percentage by mass:
Al 2 O 3 60-75wt%；
SiO 2 20-35wt%；
and others 1-5 wt%.
Preferably, the composite micro powder comprises the following components in percentage by mass:
α- Al 2 O 3 micro powder 3-10 wt%,
1 to 5 weight percent of silicon micro powder,
5-15wt% of high-efficiency polycarboxylic acid water reducing agent or tripolyphosphate or hexametaphosphate.
The binding agent is aluminate cement.
And (4) baking at the low temperature of 400 ℃.
The performance test indexes of the rotary kiln lining prepared by the method disclosed by the invention and the traditional rotary kiln lining are compared and are shown in the following table:
example 2
As shown in fig. 1-4, in this embodiment, the demolding mechanism includes a demolding frame, a feeding function portion, a demolding function portion, and a distributing function portion, the feeding function portion, the demolding function portion, and the distributing function portion are sequentially installed on the demolding frame from front to back, and an upper material loading station of the feeding function portion is connected to a discharge end conveyor belt of the low-temperature baking machine; the lower material bearing station of the feeding functional part, the demoulding functional part and the lower material distributing station of the material distributing functional part are connected through a lower conveying belt; the upper distributing station of the distributing function part is connected with the upper conveyer belt.
The feeding function part comprises a front overturning conveying device, the front overturning conveying device comprises a front overturning driving device, a front overturning arm and a front overturning sucker, the front overturning driving device is installed at the front end of the demoulding rack, the front overturning driving device is connected with the front overturning arm, and the front overturning sucker is installed on the front overturning arm; when the front overturning arm is driven by the front overturning driving device to reach the uppermost end, the front overturning arm reaches the upper material bearing station, and the front overturning sucker faces to the right upper side; when the front overturning driving device drives the front overturning arm to reach the lowest end, the front overturning arm reaches the lower material bearing station, and at the moment, the front overturning sucker faces to the right lower side.
A material bearing slow-falling device is arranged at an upper material bearing station and is arranged on the demoulding rack; the material bearing slow-falling device comprises a left material bearing support arm and a right material bearing support arm, the left material bearing support arm and the right material bearing support arm are respectively installed on the demoulding rack, the upper end of the right side of the left material bearing support arm is hinged with a left spring clamping arm, the upper end of the left side of the right material bearing support arm is hinged with a right spring clamping arm, a left slow-falling support spring is arranged between the left material bearing support arm and the left spring clamping arm, and a right slow-falling support spring is arranged between the right material bearing support arm and the right spring clamping arm; after the model containing the blank is conveyed to the position between the left material bearing support arm and the right material bearing support arm along the conveying belt at the discharge end of the low-temperature baking machine, the model can slowly descend along the left spring clamping arm and the right spring clamping arm under the action of self gravity until the lower bottom surface of the model is contacted with the front overturning sucker waiting at the material bearing station, and the front overturning sucker can firmly adsorb the lower bottom surface of the model.
The front overturning driving device drives the front overturning arm to rotate, the front overturning sucker drives the model and the blank inside the model to overturn for 180 degrees until reaching the lower material bearing station, and then the front overturning sucker releases the model to enable the model, namely the blank, to fall onto the lower conveying belt.
The demoulding function part comprises a lower lifting device, an upper clamping device and a rotary hammer type striking device.
The conveyer belt includes the conveyer belt body more than three, sets up the area body clearance between each conveyer belt body, and the device of lifting down includes at least three lifting cylinder, and each lifting cylinder sets up in the lower part in each area body clearance, and the lifting arm of lifting the cylinder can pass the area body clearance and upwards lift, and the upper end of lifting the arm is connected and is lifted the board.
An upper clamping device is arranged above the lower conveyor belt and is positioned right above each lifting plate; the upper clamping device comprises a clamping arm mounting beam, a left spring clamping jaw and a right spring clamping jaw are respectively arranged at two ends of the clamping arm mounting beam, and the left spring clamping jaw and the right spring clamping jaw respectively comprise a group of clamping functional bodies; the clamping function body comprises a reversed-L-shaped spring support arranged above a clamping arm mounting beam end plate, the upper end of a clamping spring is fixed at the lower part of a cross arm of the spring support, the lower end of the clamping spring is connected with the upper end of a large arc arm, the middle part of the large arc arm is hinged on the clamping arm mounting beam, and a large rubber anti-falling roller is arranged at the lower end of the large arc arm; the middle part of the small arc arm is hinged on the clamping arm mounting beam at the inner side of the large arc arm, the upper end of the small arc arm abuts against the inner side wall at the upper end of the large arc arm, and the lower end of the lower protective plate is provided with a small rubber anti-falling roller; the arc openings of the large arc arm and the small arc arm are oppositely arranged; drive when lifting the cylinder and lift the arm and lift the board and pass each conveyer belt body and rise, lift model and blank, when the contact of the little rubber anticreep gyro wheel of model and minor arc arm lower extreme and upwards overturn the minor arc arm around the articulated shaft, can make the upper end of minor arc arm with the ascending jack-up of upper end of major arc arm, the lower extreme of major arc arm can be to the rotatory chucking model outer wall of inboard.
A motor mounting frame is vertically arranged at the upper part of the clamping arm mounting beam and is fixed at the middle part of the demoulding rack; a demoulding motor is fixed on the motor mounting frame, a motor shaft of the demoulding motor is sleeved with a rotating wheel, more than three demoulding hammer arms are annularly arranged on the periphery of the rotating wheel, and the extending end of each demoulding hammer arm is connected with a steel hammer through a hammering spring; after the demoulding motor is started, the rotating wheel can be driven to rotate around the motor shaft, and each steel hammer head is driven to knock the mould in turn until the blank is loosened in the mould for demoulding.
The material distribution function part comprises a rear overturning conveying device, the rear overturning conveying device comprises a rear overturning driving device, a rear overturning arm and a rear overturning sucker, the rear overturning driving device is installed at the front end of the demoulding rack, the rear overturning driving device is connected with the rear overturning arm, and the rear overturning sucker is installed on the rear overturning arm; when the rear overturning driving device drives the rear overturning arm to reach the uppermost end, the rear overturning arm reaches the upper material distributing station, and the rear overturning sucker faces to the right upper side; when the rear overturning driving device drives the rear overturning arm to reach the lowest end, the rear overturning arm reaches the lower material distribution station, and the rear overturning sucker faces to the right lower side; an electric ejector rod is arranged on the left side of the material feeding station, and an upper conveying belt is arranged on the right side of the material feeding station in a connected mode.
When loosened blanks and models are conveyed to a lower material distribution station along a lower conveying belt, a rear overturning sucker waiting at the lower material distribution station can adsorb the models and drive the models to overturn for 180 degrees to the upper material distribution station, and an electric ejector rod is started to push the models to the upper conveying belt; at the moment, the blanks left on the lower conveyor belt after demoulding can be conveyed to a packaging position along the lower conveyor belt to be collected and packaged.
Example 3
As shown in fig. 5-7, in the present embodiment, the front flipping driving device and the rear flipping driving device each include a set of flipping functional bodies; the turnover function body comprises a vertically arranged fixed vertical plate, a guide rail vertical plate is fixed on the upper part of the fixed vertical plate, and a 'shape reversing guide groove' is formed in the guide rail vertical plate.
The front turning arm and the rear turning arm respectively comprise a first connecting rod, a second connecting rod and a third connecting rod; the reversing guide groove is internally inserted with a guide sliding block, the extending end of the guide sliding block is vertically connected with one end of a first connecting rod, the other end of the first connecting rod is vertically connected with one end of a second connecting rod, the other end of the second connecting rod is vertically connected with a third connecting rod, the other end of the third connecting rod is fixedly connected with a front overturning sucker or a rear overturning sucker, and the front overturning sucker and the rear overturning sucker are both electric suckers.
A horizontally arranged support plate is vertically fixed in the middle of the fixed vertical plate, and a lifting guide hole is formed in the support plate; a connecting rod sleeve is sleeved on the second connecting rod, and the second connecting rod can freely rotate in the connecting rod sleeve; the upper end of an upper lifting driving rod is vertically fixed on the lower portion of the connecting rod sleeve, the lower end of the upper lifting driving rod penetrates through the lifting guide hole and then is hinged to the upper end of a middle lifting driving rod, the lower end of the middle lifting driving rod is hinged to the upper end of a lower lifting driving rod, the lower end of the lower lifting driving rod is hinged to an electrode shaft of a driving motor, and the driving motor is installed on the lower portion of the fixed vertical plate.
When the driving motor drives the lower lifting driving rod to rotate, the upper lifting driving rod can be driven by the middle lifting driving rod to vertically move up and down along the lifting guide hole, the upper lifting driving rod drives the second connecting rod to vertically move up and down through the connecting rod sleeve, and meanwhile, the guide sliding block is enabled to move along the reversing guide groove; when the guide slide block is positioned at the lower limit position in the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces downwards, and meanwhile, the front overturning sucker or the rear overturning sucker also faces downwards; when the guide slide block is positioned at the left convex part of the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces towards the right side, and meanwhile, the front overturning sucker or the rear overturning sucker also faces towards the right side; when the guide slide block is positioned at the upper limit position in the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces upwards, and meanwhile, the front overturning sucker or the rear overturning sucker also faces upwards; therefore, the front overturning driving device and the rear overturning driving device can adsorb materials and overturn 180 degrees.
The upset function body sets up, makes the upset operation can not occupy too much left side space and right side space, practices thrift installation and operating space more than traditional runner formula drive switching-over device, avoids appearing the interference situation between equipment.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention, without departing from the technical solution of the present invention, still belong to the protection scope of the technical solution of the present invention.
Claims (5)
1. A preparation method of a liner for a microcrystalline alumina high-temperature rotary kiln is characterized by comprising the following steps:
(1) weighing and preparing raw materials;
(2) uniformly mixing the prepared raw materials in a mixing roll, adding water accounting for 4-6wt% of the total weight of the raw materials, and uniformly stirring at the normal temperature of 5-25 ℃;
(3) pouring and forming the mixed material which is stirred by adding water in a model of an automatic pouring machine to obtain a blank;
(4) baking the blank by a low-temperature baking machine until the blank is shaped, and then conveying the blank to a demoulding mechanism for demoulding;
wherein the raw materials in the step (1) comprise the following components in percentage by mass:
10-20wt% of tabular corundum particles with the particle size of 10-5 mm;
10-20wt% of tabular corundum particles with the particle size of 5-3 mm;
10-20wt% of mullite grains with the grain diameter of 3-1 mm;
5-15wt% of tabular corundum particles with the particle size of 1-0 mm;
5-10wt% of mullite grains with grain diameter of 1-0mm
5-10wt% of mullite fine powder with the fineness of 200 meshes;
5-10wt% of tabular corundum fine powder with the fineness of 200 meshes;
2-6wt% of composite micro powder;
2-6wt% of a binder;
the demoulding mechanism comprises a demoulding rack, a feeding function part, a demoulding function part and a distributing function part, wherein the feeding function part, the demoulding function part and the distributing function part are sequentially arranged on the demoulding rack from front to back; the lower material bearing station of the feeding functional part, the demoulding functional part and the lower material distributing station of the material distributing functional part are connected through a lower conveying belt; an upper material distributing station of the material distributing functional part is connected with an upper conveyor belt;
the feeding function part comprises a front overturning conveying device, the front overturning conveying device comprises a front overturning driving device, a front overturning arm and a front overturning sucker, the front overturning driving device is installed at the front end of the demoulding rack, the front overturning driving device is connected with the front overturning arm, and the front overturning sucker is installed on the front overturning arm; when the front overturning arm is driven by the front overturning driving device to reach the uppermost end, the front overturning arm reaches the upper material bearing station, and the front overturning sucker faces to the right upper side; when the front overturning arm is driven by the front overturning driving device to reach the lowest end, the front overturning arm reaches the lower material bearing station, and the front overturning sucker faces to the right lower side;
a material bearing slow-falling device is arranged at an upper material bearing station and is arranged on the demoulding rack; the material bearing slow-falling device comprises a left material bearing support arm and a right material bearing support arm, the left material bearing support arm and the right material bearing support arm are respectively installed on the demoulding rack, the upper end of the right side of the left material bearing support arm is hinged with a left spring clamping arm, the upper end of the left side of the right material bearing support arm is hinged with a right spring clamping arm, a left slow-falling support spring is arranged between the left material bearing support arm and the left spring clamping arm, and a right slow-falling support spring is arranged between the right material bearing support arm and the right spring clamping arm; after a model containing blanks is conveyed to a position between the left material bearing support arm and the right material bearing support arm along a discharge end conveying belt of the low-temperature baking machine, the model can slowly descend along the left spring clamping arm and the right spring clamping arm under the action of self gravity until the lower bottom surface of the model is contacted with a front overturning sucker waiting at a material bearing station, and the front overturning sucker can firmly adsorb the lower bottom surface of the model;
the front overturning driving device drives the front overturning arm to rotate, the front overturning sucker drives the model and the blank inside the model to overturn for 180 degrees until the model reaches a lower material bearing station, and then the front overturning sucker releases the model to enable the model, namely the blank, to fall onto a lower conveying belt;
the composite micro powder comprises the following components in percentage by mass:
α- Al 2 O 3 70-85 wt% of micro powder,
12-25 wt% of silicon micropowder,
5-15wt% of high-efficiency polycarboxylic acid water reducing agent or tripolyphosphate or hexametaphosphate;
the binding agent is aluminate cement; the low-temperature baking in the step (4) is 400 ℃;
the demoulding function part comprises a lower lifting device, an upper clamping device and a rotary hammer type striking device;
the lower conveying belt comprises more than three conveying belt bodies, belt body gaps are formed among the conveying belt bodies, the lower lifting device comprises at least three lifting cylinders, each lifting cylinder is arranged at the lower part of each belt body gap, a lifting arm of each lifting cylinder can penetrate through the belt body gap to lift upwards, and the upper end of each lifting arm is connected with a lifting plate;
an upper clamping device is arranged above the lower conveyor belt and is positioned right above each lifting plate; the upper clamping device comprises a clamping arm mounting beam, a left spring clamping jaw and a right spring clamping jaw are respectively arranged at two ends of the clamping arm mounting beam, and the left spring clamping jaw and the right spring clamping jaw respectively comprise a group of clamping functional bodies; the clamping function body comprises a reversed-L-shaped spring support arranged above a clamping arm mounting beam end plate, the upper end of a clamping spring is fixed at the lower part of a cross arm of the spring support, the lower end of the clamping spring is connected with the upper end of a large arc arm, the middle part of the large arc arm is hinged on the clamping arm mounting beam, and a large rubber anti-falling roller is arranged at the lower end of the large arc arm; the middle part of the small arc arm is hinged on the clamping arm mounting beam at the inner side of the large arc arm, the upper end of the small arc arm abuts against the inner side wall at the upper end of the large arc arm, and the lower end of the lower protective plate is provided with a small rubber anti-falling roller; the arc openings of the large arc arm and the small arc arm are oppositely arranged; when the lifting cylinder drives the lifting arm and the lifting plate to pass through each conveying belt body to ascend, the model and the blank are lifted, when the model is in contact with the small rubber anti-falling idler wheel at the lower end of the small arc arm and the small arc arm is turned upwards around the hinge shaft, the upper end of the large arc arm can be jacked upwards by the upper end of the small arc arm, and the outer wall of the model can be clamped by the lower end of the large arc arm in a inwards rotating mode;
a motor mounting frame is vertically arranged at the upper part of the clamping arm mounting beam and is fixed at the middle part of the demoulding rack; a demoulding motor is fixed on the motor mounting frame, a motor shaft of the demoulding motor is sleeved with a rotating wheel, more than three demoulding hammer arms are annularly arranged on the periphery of the rotating wheel, and the extending end of each demoulding hammer arm is connected with a steel hammer through a hammering spring; after the demoulding motor is started, the rotating wheel can be driven to rotate around the motor shaft, and each steel hammer head is driven to strike the mould in turn until the blank is loosened in the mould and demoulding is carried out.
2. The preparation method of the liner for the microcrystalline alumina high-temperature rotary kiln, as claimed in claim 1, wherein the plate-like corundum particles and the fine powder comprise the following chemical components in percentage by mass:
Al 2 O 3 90-99wt%；
1-10% by weight of the others.
3. The preparation method of the lining for the microcrystalline alumina high-temperature rotary kiln, as claimed in claim 2, wherein the mullite grains and fine powder comprise the following chemical components in percentage by mass:
Al 2 O 3 60-75wt%；
SiO 2 20-35wt%；
1-5wt% of others.
4. The preparation method of the liner for the microcrystalline alumina high-temperature rotary kiln, according to claim 3, characterized in that the material distribution function part comprises a rear overturning conveying device, the rear overturning conveying device comprises a rear overturning driving device, a rear overturning arm and a rear overturning sucker, the rear overturning driving device is installed at the front end of the demoulding frame, the rear overturning driving device is connected with the rear overturning arm, and the rear overturning arm is provided with the rear overturning sucker; when the rear overturning driving device drives the rear overturning arm to reach the uppermost end, the rear overturning arm reaches the upper material distributing station, and the rear overturning sucker faces to the right upper side; when the rear overturning driving device drives the rear overturning arm to reach the lowest end, the rear overturning arm reaches the lower material distribution station, and the rear overturning sucker faces to the right lower side; an electric ejector rod is arranged on the left side of the upper material distributing station, and an upper conveyor belt is arranged on the right side of the upper material distributing station in a connected mode;
when loosened blanks and models are conveyed to a lower material distribution station along a lower conveying belt, a rear overturning sucker waiting at the lower material distribution station can adsorb the models and drive the models to overturn for 180 degrees to the upper material distribution station, and an electric ejector rod is started to push the models to the upper conveying belt; at the moment, the blanks left on the lower conveyor belt after demoulding can be conveyed to a packaging position along the lower conveyor belt to be collected and packaged.
5. The method for preparing the lining for the microcrystalline alumina high-temperature rotary kiln as claimed in claim 4, wherein the front overturning driving device and the rear overturning driving device both comprise a group of overturning functional bodies; the turnover function body comprises a fixed vertical plate which is vertically arranged, a guide rail vertical plate is fixed on the upper part of the fixed vertical plate, and a 'shape reversing guide groove' is formed in the guide rail vertical plate;
the front turning arm and the rear turning arm respectively comprise a first connecting rod, a second connecting rod and a third connecting rod; a guide sliding block is inserted in the reversing guide groove, the extending end of the guide sliding block is vertically connected with one end of a first connecting rod, the other end of the first connecting rod is vertically connected with one end of a second connecting rod, the other end of the second connecting rod is vertically connected with a third connecting rod, the other end of the third connecting rod is fixedly connected with a front overturning sucker or a rear overturning sucker, and the front overturning sucker and the rear overturning sucker are both electric suckers;
a horizontally arranged support plate is vertically fixed in the middle of the fixed vertical plate, and a lifting guide hole is formed in the support plate; a connecting rod sleeve is sleeved on the second connecting rod, and the second connecting rod can freely rotate in the connecting rod sleeve; the upper end of an upper lifting driving rod is vertically fixed at the lower part of the connecting rod sleeve, the lower end of the upper lifting driving rod is hinged with the upper end of a middle lifting driving rod after penetrating through a lifting guide hole, the lower end of the middle lifting driving rod is hinged with the upper end of a lower lifting driving rod, the lower end of the lower lifting driving rod is hinged on an electrode shaft of a driving motor, and the driving motor is installed at the lower part of the fixed vertical plate;
when the driving motor drives the lower lifting driving rod to rotate, the upper lifting driving rod can be driven by the middle lifting driving rod to vertically move up and down along the lifting guide hole, the upper lifting driving rod drives the second connecting rod to vertically move up and down through the connecting rod sleeve, and meanwhile, the guide sliding block is enabled to move along the reversing guide groove; when the guide slide block is positioned at the lower limit position in the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces downwards, and meanwhile, the front overturning sucker or the rear overturning sucker also faces downwards; when the guide slide block is positioned at the left convex part of the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces towards the right side, and meanwhile, the front overturning sucker or the rear overturning sucker also faces towards the right side; when the guide slide block is positioned at the upper limit position in the reversing guide groove, one end of the first connecting rod connected with the second connecting rod faces upwards, and meanwhile, the front overturning sucker or the rear overturning sucker also faces upwards; therefore, the front overturning driving device and the rear overturning driving device can adsorb materials and overturn 180 degrees.
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