CN116766371B - Drying and shaping machine and preparation system for silicon carbide ceramic tube - Google Patents
Drying and shaping machine and preparation system for silicon carbide ceramic tube Download PDFInfo
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- CN116766371B CN116766371B CN202310654958.1A CN202310654958A CN116766371B CN 116766371 B CN116766371 B CN 116766371B CN 202310654958 A CN202310654958 A CN 202310654958A CN 116766371 B CN116766371 B CN 116766371B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/0063—Control arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/04—Exhausting or laying dust
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention provides a drying and shaping machine and a preparation system of a silicon carbide ceramic tube, and relates to the field of ceramic preparation. The drying and shaping machine comprises a drying room, a blank pipe conveying vehicle and a hot air device, wherein a hot air pipeline is arranged in the drying room, and the hot air device is connected with the hot air pipeline; the blank pipe conveying vehicle comprises a main box body, a blank pipe bracket and a heat conduction core pipe, wherein the heat conduction core pipe is detachably arranged on the blank pipe bracket; the main box body is provided with an air inlet and a plurality of air outlets, the air inlet is detachably communicated with the hot air pipeline, and the plurality of air outlets are distributed on one side surface of the main box body; the heat conduction core tube is provided with a first port and a second port, and the first port is in plug-in fit with the exhaust port; a hot air channel is formed in the heat conduction core tube to conduct the exhaust port and the second port; the heat conducting core pipe is also provided with a cylindrical outer wall, the cylindrical outer wall of the heat conducting core pipe is used for being attached to the blank pipe, and the thermal expansion rate of the heat conducting core pipe is larger than that of the dry blank pipe. Ensures that the dried blank pipe achieves higher accuracy and straightness of the shape of the cross section.
Description
Technical Field
The invention relates to the technical field of ceramic preparation, in particular to a drying and shaping machine and a preparation system of a silicon carbide ceramic tube.
Background
The fire-resistant roller is a key component in the roller kiln, and plays a role in bearing and conveying products. In the calcination and purification of lithium battery materials, corrosive gases such as hydrofluoric acid are generated, and a common roller is easily corroded by an acidic atmosphere.
The silicon carbide ceramic has the characteristics of high hardness, wear resistance, high temperature resistance, low expansion coefficient, good thermal stability, excellent chemical corrosion resistance and the like, and becomes an ideal material for preparing ceramic rollers. At present, the ceramic blank is mostly extruded and molded, the roundness and straightness of the silicon carbide ceramic roller are difficult to control, and particularly for large-size silicon carbide ceramic rollers with thinner wall layers. In the drying process of the green body, the high-roundness high-straightness silicon carbide ceramic green body subjected to extrusion molding often has shape collapse to a certain extent, if the deviation of roundness and straightness is small, the inside and outside of the green body can be polished and polished for repair, and the green body with large deviation of roundness and straightness can only be abandoned. Moreover, as the silicon carbide ceramic roller prepared by the subsequent sintering can shrink less, the roundness and straightness of the ceramic roller are almost determined by the roundness and straightness of the ceramic blank before the sintering process, and the control of the roundness and straightness of the blank is very important.
In summary, after the existing silicon carbide ceramic blank is extruded and molded, local collapse is easy to occur in the process of drying the blank, the accuracy and straightness of the shape of the cross section are difficult to ensure, and particularly, the yield of the large-size silicon carbide ceramic tube is low.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a drying and shaping machine and a preparation system for a silicon carbide ceramic tube, so as to solve the problems that partial collapse is easy to occur in the drying process of a blank, the accuracy and straightness of the cross section shape are difficult to ensure, and particularly the yield of preparing a large-size silicon carbide ceramic tube is low.
The technical scheme of the drying and shaping machine for the silicon carbide ceramic tube is as follows:
the drying and shaping machine for the silicon carbide ceramic tube comprises a drying room, a blank tube conveying vehicle and a hot air device, wherein the blank tube conveying vehicle is movably arranged in the drying room, a hot air pipeline is arranged in the drying room, and the hot air device is connected with the hot air pipeline;
the blank pipe conveying vehicle comprises a main box body, a blank pipe support and a heat conduction core pipe, wherein the blank pipe support is fixedly connected with the main box body, and the heat conduction core pipe is detachably arranged on the blank pipe support;
The main box body is provided with an air inlet and a plurality of air outlets, the air inlet is detachably communicated with the hot air pipeline, and the plurality of air outlets are distributed on one side surface of the main box body;
the heat conduction core tube is provided with a first port and a second port, and the first port is in plug-in fit with the exhaust port; a hot air channel is formed in the heat conduction core tube so as to conduct the exhaust port and the second port;
the heat conduction core pipe is also provided with a cylindrical outer wall which is used for being attached to the blank pipe, and the thermal expansion rate of the heat conduction core pipe is larger than that of the dry blank pipe.
Further, the cylindrical outer wall of the heat conducting core tube is a cylindrical outer wall, and the thermal expansion coefficient of the heat conducting core tube is 5 multiplied by 10 -6 Per DEG C to 50X 10 -6 between/deg.C.
Further, the surface roughness of the cylindrical outer wall of the heat conducting core tube is less than or equal to 3 mu m.
Further, the heat conducting core pipe is a metal core pipe, and the heat conducting coefficient of the metal core pipe is more than or equal to 40.
Further, the main box body is positioned at the lower part of the blank pipe conveying vehicle, the blank pipe support is fixedly connected to the upper side of the main box body, and the exhaust ports are distributed on the upper side surface of the main box body at intervals;
The blank pipe support is provided with a plurality of blank pipe positioning parts, the blank pipe positioning parts are arranged up and down relative to the corresponding exhaust ports, and the blank pipe positioning parts are matched with the second ports in a positioning mode.
Further, the blank pipe support comprises an upper support arm, the length direction of the upper support arm is parallel to the upper side face of the main box body, the second port protrudes out of the upper portion of the upper support arm, and the outer wall of the second port is in abutting fit with the side edge of the upper support arm.
Further, a plurality of pipe clamps are installed on the upper support arm at intervals, and the pipe clamps form a blank pipe positioning part matched with the second port in a clamping manner.
Further, the blank pipe support further comprises a vertical frame, the vertical frame is fixedly arranged at one side edge of the main box body, a plurality of upper support arms are arranged, the upper support arms are respectively connected to the upper sides of the vertical frame, and the upper support arms are distributed at intervals in parallel.
Further, the upper portion of the drying room is further provided with a moisture discharging port, and the second port is arranged towards the moisture discharging port.
Further, the hot air pipe is arranged at the lower part of the side wall of the drying room, the air inlet is arranged at the side surface of the main box body, and the air inlet and the corresponding air outlet of the hot air pipe are positioned at the same height.
Further, the moving direction of the blank pipe conveying vehicle is the front-back direction, the two side walls of the drying room are respectively provided with a hot air pipeline in bilateral symmetry, the outer outline of the main box body is cuboid, the two sides of the main box body are respectively provided with a left side air inlet and a right side air inlet, the left side air inlet corresponds to the left hot air pipeline, and the right side air inlet corresponds to the right hot air pipeline.
Further, the heat conducting core tube is made of any one of copper and aluminum or any one of alloy materials of copper, iron and aluminum.
The technical scheme of the preparation system of the silicon carbide ceramic tube is as follows:
the preparation system of the silicon carbide ceramic tube comprises an extrusion molding machine and a drying and shaping machine, wherein the drying and shaping machine is a drying and shaping machine of the silicon carbide ceramic tube;
the extrusion molding machine comprises a vertical frame, an extrusion mechanism and a molding die, wherein the extrusion mechanism and the molding die are both arranged on the upper part of the vertical frame, the extrusion mechanism is provided with a piston, the molding die is provided with a feeding channel and a molding discharge hole, and the piston is in sliding sealing fit with the feeding channel;
the forming discharge hole is arranged downwards, a base is further arranged at the lower part of the vertical frame, the base is positioned right below the forming discharge hole, a heat conduction core tube is detachably arranged between the base and the forming discharge hole, and the cylindrical outer wall of the heat conduction core tube is used for being in sliding fit with the inner wall of the extruded blank tube;
The drying and shaping machine for the silicon carbide ceramic tube comprises a drying room, a blank tube conveying vehicle and a hot air device, wherein the blank tube conveying vehicle is movably arranged in the drying room, a hot air pipeline is arranged in the drying room, and the hot air device is connected with the hot air pipeline;
the blank pipe conveying vehicle comprises a main box body, a blank pipe support and a heat conduction core pipe, wherein the blank pipe support is fixedly connected with the main box body, and the heat conduction core pipe is detachably arranged on the blank pipe support;
the main box body is provided with an air inlet and a plurality of air outlets, the air inlet is detachably communicated with the hot air pipeline, and the plurality of air outlets are distributed on one side surface of the main box body;
the heat conduction core tube is provided with a first port and a second port, and the first port is in plug-in fit with the exhaust port; a hot air channel is formed in the heat conduction core tube so as to conduct the exhaust port and the second port;
the heat conduction core pipe is also provided with a cylindrical outer wall which is used for being attached to the blank pipe, and the thermal expansion rate of the heat conduction core pipe is larger than that of the dry blank pipe.
Further, the cylindrical outer wall of the heat conducting core tube is a cylindrical outer wall, and the thermal expansion coefficient of the heat conducting core tube is 5 multiplied by 10 -6 Per DEG C to 50X 10 -6 between/deg.C.
Further, the surface roughness of the cylindrical outer wall of the heat conducting core tube is less than or equal to 3 mu m.
Further, the heat conducting core pipe is a metal core pipe, and the heat conducting coefficient of the metal core pipe is more than or equal to 40.
Further, the main box body is positioned at the lower part of the blank pipe conveying vehicle, the blank pipe support is fixedly connected to the upper side of the main box body, and the exhaust ports are distributed on the upper side surface of the main box body at intervals;
the blank pipe support is provided with a plurality of blank pipe positioning parts, the blank pipe positioning parts are arranged up and down relative to the corresponding exhaust ports, and the blank pipe positioning parts are matched with the second ports in a positioning mode.
Further, the blank pipe support comprises an upper support arm, the length direction of the upper support arm is parallel to the upper side face of the main box body, the second port protrudes out of the upper portion of the upper support arm, and the outer wall of the second port is in abutting fit with the side edge of the upper support arm.
Further, a plurality of pipe clamps are installed on the upper support arm at intervals, and the pipe clamps form a blank pipe positioning part matched with the second port in a clamping manner.
Further, the blank pipe support further comprises a vertical frame, the vertical frame is fixedly arranged at one side edge of the main box body, a plurality of upper support arms are arranged, the upper support arms are respectively connected to the upper sides of the vertical frame, and the upper support arms are distributed at intervals in parallel.
Further, the upper portion of the drying room is further provided with a moisture discharging port, and the second port is arranged towards the moisture discharging port.
Further, the hot air pipe is arranged at the lower part of the side wall of the drying room, the air inlet is arranged at the side surface of the main box body, and the air inlet and the corresponding air outlet of the hot air pipe are positioned at the same height.
Further, the moving direction of the blank pipe conveying vehicle is the front-back direction, the two side walls of the drying room are respectively provided with a hot air pipeline in bilateral symmetry, the outer outline of the main box body is cuboid, the two sides of the main box body are respectively provided with a left side air inlet and a right side air inlet, the left side air inlet corresponds to the left hot air pipeline, and the right side air inlet corresponds to the right hot air pipeline.
Further, the heat conducting core tube is made of any one of copper and aluminum or any one of alloy materials of copper, iron and aluminum.
Furthermore, a blank pipe clamp is detachably arranged outside the heat conduction core pipe, and the blank pipe clamp is used for clamping the outside of a clamping section of the extruded blank pipe.
Further, a vertical sliding mechanism is further arranged on the lower side of the vertical frame, the vertical sliding mechanism and the heat conduction core tube are arranged at intervals in parallel, a sliding block is mounted on the vertical sliding mechanism, and the blank tube clamp is connected with the sliding block.
Further, the device also comprises a controller, the vertical sliding mechanism is further provided with a position sensor, and the controller is respectively and electrically connected with the position sensor and the extrusion mechanism.
Further, a cutter is further mounted on the vertical frame, the cutting face of the cutter is perpendicular to the axis direction of the forming discharge hole, and the controller is electrically connected with the cutter, so that when the length of the extruded blank pipe reaches a set value, the cutter is controlled to cut off the blank pipe.
Further, the extrusion mechanism is a hydraulic extrusion mechanism and comprises a fixed seat, a hydraulic oil cylinder and an oil pump, wherein the fixed seat is arranged on the upper portion of the vertical frame, the hydraulic oil cylinder is arranged on the fixed seat, and an oil delivery pipe is communicated between the oil pump and the hydraulic oil cylinder.
Further, the cylinder body of the hydraulic cylinder is connected with the fixing seat, the push rod of the hydraulic cylinder penetrates through the fixing seat and extends to the lower side of the fixing seat, and the piston is mounted at the end part of the push rod of the hydraulic cylinder.
Further, a feeding hopper is further arranged on the upper side of the feeding channel, and the feeding hopper is matched with the piston.
Further, still include semi-manufactured goods polisher, semi-manufactured goods polisher includes outer casing, grinding apparatus, driving motor, be equipped with in the outer casing and supply semi-manufactured goods base pipe axial displacement's conveying channel, the grinding apparatus rotate install in the outer casing, the axis of rotation of grinding apparatus with conveying channel is coaxial to be arranged, driving motor with the grinding apparatus transmission is connected.
Further, the outer casing is rotatably provided with a transmission cylinder, the end part of the transmission cylinder is fixedly connected with a grinding tool jacket, the grinding tool is detachably arranged on the grinding tool jacket, the inside of the transmission cylinder forms the conveying channel, and the driving motor is in belt transmission connection with the transmission cylinder.
Further, the outer shell is further provided with a dust interface, and the dust interface is connected with a dust collection mechanism.
The beneficial effects are that: the drying and shaping machine for the silicon carbide ceramic tube adopts the design form of a drying room, a blank tube conveying vehicle and a hot air device, wherein the blank tube conveying vehicle is movably arranged in the drying room, a whole batch of blank tubes can be conveyed into the drying room through the blank tube conveying vehicle, and the whole batch of blank tubes are moved out of the drying room after the drying is finished; the hot air device is connected with a hot air pipeline of the drying room, the hot air device generates hot air with drying temperature and transmits the hot air to the hot air pipeline, and the hot air transmits heat to the wet blank pipe through the main box body and the heat conducting core pipe, so that the drying and shaping effects are achieved.
Because the blank pipe conveying vehicle comprises a main box body, a blank pipe support and a heat conducting core pipe, the blank pipe support is fixedly connected with the main box body, the heat conducting core pipe is detachably arranged on the blank pipe support, and the cylindrical outer wall of the heat conducting core pipe is attached to the blank pipe. Namely, the blank pipe is directly sleeved outside the heat conduction core pipe, and the inner surface of the blank pipe is attached to the cylindrical outer wall of the heat conduction core pipe; the heat conducting core pipe and the wet blank pipe are combined together through adhesive force and friction force, and the heat conducting core pipe plays a role in supporting and shaping the wet blank pipe, so that the wet blank pipe is prevented from local slumping or dent deformation in the drying process.
During drying, the first port of the heat conducting core pipe is inserted into the exhaust port of the main box body, hot air flows into the heat conducting core pipe from the exhaust port of the main box body, flows continuously along the hot air channel of the heat conducting core pipe, flows out from the second port of the heat conducting core pipe and finally is discharged out through the moisture discharge port. Because the heat of the hot air flow is conducted to the pipe wall of the heat conducting core pipe when the hot air flow circulates in the heat conducting core pipe, the good heat conductivity of the heat conducting core pipe ensures that the temperature of each part of the inner wall of the blank pipe reaches a uniform state. And the heat is evenly radiated and transferred outwards from the inner wall of the blank pipe in a central radiation mode, the volatilization of the water is also diffused from the inner wall of the blank pipe to the outer wall, namely, the heat conduction direction is consistent with the volatilization diffusion direction of the water, the heat distribution consistency at different positions along the axis direction is good, the uniform heat transfer is not influenced even if the length of the blank pipe is large, the local internal stress generated by uneven shrinkage in the drying process of the blank pipe can be greatly avoided, and the dried blank pipe is ensured to achieve higher accuracy and straightness of the cross section shape.
Meanwhile, in the drying process, as the heat conducting core pipe always exists in the blank pipe, the heat conducting core pipe is heated to generate volume expansion, the wet blank pipe is dried to generate volume contraction, so that the inner wall of the blank pipe is more fully and tightly combined with the heat conducting core pipe, the thermal expansion rate and the drying contraction rate are far smaller than the dimensional precision of the blank pipe, the further cross section shape shaping effect is generated on the wet blank pipe in the drying process, the smoothness and the dimensional precision of the inner wall of the blank pipe can be improved through the cylindrical outer wall of the heat conducting core pipe, the process of polishing and grinding the inner wall of the blank pipe again after drying is omitted, the precision and the straightness of the cross section shape of the blank pipe after drying are ensured, and particularly the yield of preparing the large-size silicon carbide ceramic pipe is remarkably improved.
When the drying is still in the high-temperature stage, the high-temperature stage is 60-80 ℃, the dry blank pipe and the heat conduction core pipe are kept in a tightly combined state, and the dry blank pipe in the high-temperature stage is polished at the moment, which is equivalent to the fact that a supporting part is arranged in the dry blank pipe, so that the risk of damage to the blank pipe in the blank repairing process is reduced. At the moment, the blank is trimmed, and internal stress possibly generated in the drying process of the blank tube can be released, so that structural deformation of the fired silicon carbide ceramic tube is avoided. And after finishing the trimming, continuing to cool, wherein the heat conducting core pipe is cooled to generate volume shrinkage, and the heat conducting core pipe is cooled to generate volume shrinkage, so that the heat conducting core pipe is cooled to generate volume shrinkage larger than that of the dry blank pipe, and the original joint surface is separated due to internal and external shrinkage difference, thereby automatically separating the heat conducting core pipe from the dry blank pipe, easily drawing the pipe and avoiding damaging the blank pipe.
Drawings
FIG. 1 is a schematic vertical cross-sectional view of a dryer-setter of a preparation system of silicon carbide ceramic tubes of the present invention;
FIG. 2 is a schematic top view of a dryer-setter of the silicon carbide ceramic tube manufacturing system of the present invention;
FIG. 3 is a schematic front view of an extrusion molding machine in embodiment 1 of a system for producing silicon carbide ceramic tubes according to the present invention;
FIG. 4 is a schematic view of a semi-finished sander in another embodiment of a system for preparing silicon carbide ceramic tubes according to the present invention;
fig. 5 is a schematic side view of a semi-finished sander in another embodiment of a system for producing silicon carbide ceramic tubes of the present invention.
In fig. 1 to 3: 1-drying room, 11-moisture exhaust port, 12-track, 2-blank pipe transport vehicle, 20-main box, 21-blank pipe bracket, 22-air inlet, 23-air outlet, 24-upper support arm, 25-stand and 26-roller;
3-hot air pipeline, 30-air outlet, 31-corrugated pipe, 4-heat conducting core pipe, 41-first port, 42-second port, 43-blank pipe clamp, 44-vertical sliding mechanism, 45-sliding block and 5-blank pipe;
6-extrusion molding machine, 60-vertical frame, 61-hydraulic cylinder, 610-piston, 611-hydraulic cylinder body, 612-hydraulic cylinder push rod, 62-molding die, 620-feed hopper, 63-fixed seat, 64-oil pump, 65-oil delivery pipe;
Fig. 4 to 5: 5 a-semi-finished blank pipe, 7-semi-finished grinding machine, 70-outer shell, 700-conveying channel, 71-grinding tool, 72-driving motor, 73-driving cylinder, 74-grinding tool jacket and 75-dust interface.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
As shown in fig. 1 to 5, the preparation system of the silicon carbide ceramic tube comprises an extrusion molding machine 6 and a drying and shaping machine, wherein the drying and shaping machine comprises a drying room 1, a blank tube conveying vehicle 2 and a hot air device, the blank tube conveying vehicle 2 is movably arranged in the drying room 1, a hot air pipeline 3 is arranged in the drying room 1, and the hot air device is connected with the hot air pipeline 3; the blank pipe conveying vehicle 2 comprises a main box body 20, a blank pipe support 21 and a heat conducting core pipe 4, wherein the blank pipe support 21 is fixedly connected with the main box body 20, and the heat conducting core pipe 4 is detachably arranged on the blank pipe support 21.
The main box 20 is provided with an air inlet 22 and a plurality of air outlets 23, the air inlet 22 is detachably communicated with the hot air pipeline 3, and the plurality of air outlets 23 are distributed on one side surface of the main box 20; the heat conduction core tube 4 is provided with a first port 41 and a second port 42, and the first port 41 is in plug-in fit with the exhaust port 23; a hot air passage is formed inside the heat conductive core tube 4 to communicate the exhaust port 23 and the second port 42; the heat conducting core pipe 4 is further provided with a cylindrical outer wall, the cylindrical outer wall of the heat conducting core pipe 4 is used for being attached to the blank pipe 5, and the thermal expansion rate of the heat conducting core pipe 4 is larger than the drying shrinkage rate of the blank pipe 5.
The drying and shaping machine for the silicon carbide ceramic tube adopts the design form of a drying room 1, a blank tube conveying vehicle 2 and a hot air device, wherein the blank tube conveying vehicle 2 is movably arranged in the drying room 1, a whole batch of blank tubes 5 can be conveyed into the drying room 1 through the blank tube conveying vehicle 2, and the whole batch of blank tubes are moved out of the drying room 1 after the drying is finished; the hot air device is connected with the hot air pipeline 3 of the drying room 1, the hot air device generates hot air with drying temperature and conveys the hot air to the hot air pipeline 3, and the hot air transmits heat to the wet blank pipe through the main box body 20 and the heat conducting core pipe 4, so that the drying and shaping effects are achieved.
Because the blank pipe conveying vehicle 2 comprises a main box body 20, a blank pipe support 21 and a heat conducting core pipe 4, the blank pipe support 21 is fixedly connected with the main box body 20, the heat conducting core pipe 4 is detachably arranged on the blank pipe support 21, and the cylindrical outer wall of the heat conducting core pipe 4 is attached to the blank pipe 5. Namely, the blank pipe 5 is directly sleeved outside the heat conduction core pipe 4, and the inner surface of the blank pipe 5 is attached to the cylindrical outer wall of the heat conduction core pipe 4; the heat conducting core pipe 4 and the wet blank pipe are combined together through adhesive force and friction force, the heat conducting core pipe 4 plays a role in supporting and shaping the wet blank pipe, and the wet blank pipe is prevented from local slumping or dent deformation in the drying process.
During drying, the first port 41 of the heat conducting core pipe 4 is inserted into the exhaust port 23 of the main box 20, hot air flows into the heat conducting core pipe 4 from the exhaust port 23 of the main box 20, flows continuously along the hot air channel of the heat conducting core pipe 4, flows out from the second port 42 of the heat conducting core pipe 4 and finally is discharged through the moisture discharge port 11. Because the heat of the hot air flow is conducted to the pipe wall of the heat conducting core pipe 4 when the hot air flows in the heat conducting core pipe 4, the good heat conductivity of the heat conducting core pipe 4 ensures that the temperature of the inner wall of the blank pipe 5 reaches a uniform state. And the heat is evenly dispersed and transferred outwards from the inner wall of the blank pipe 5 in a central radiation mode, the volatilization of the moisture is also diffused from the inner wall of the blank pipe 5 to the outer wall, namely, the heat conduction direction is consistent with the volatilization diffusion direction of the moisture, the heat distribution consistency at different positions along the axis direction is good, the uniform heat transfer is not influenced even if the length of the blank pipe is large, the generation of local internal stress caused by uneven shrinkage in the drying process of the blank pipe can be greatly avoided, and the higher accuracy and straightness of the cross section shape of the dried blank pipe are ensured.
Meanwhile, in the drying process, as the heat conducting core pipe 4 always exists in the blank pipe 5, the heat conducting core pipe 4 is heated to generate volume expansion, the wet blank pipe is dried to generate volume contraction, so that the inner wall of the blank pipe 5 is more fully and tightly combined with the heat conducting core pipe 4, the thermal expansion rate and the drying contraction rate are far smaller than the dimensional precision of the blank pipe 5, the further cross section shape shaping effect is generated on the wet blank pipe in the drying process, the smoothness and the dimensional precision of the inner wall of the blank pipe 5 can be improved through the cylindrical outer wall of the heat conducting core pipe 4, the process of polishing the inner wall of the blank pipe 5 again after drying is omitted, the precision and the straightness of the cross section shape of the blank pipe 5 after drying are ensured, and particularly the yield of preparing the large-size silicon carbide ceramic pipe is remarkably improved.
When the drying is still in the high-temperature stage, the high-temperature stage is 60-80 ℃, the dry blank pipe and the heat conduction core pipe 4 are kept in a tightly combined state, and the dry blank pipe in the high-temperature stage is polished at the moment, which is equivalent to that a supporting part is arranged in the dry blank pipe, so that the risk of damage to the blank pipe in the blank repairing process is reduced. At the moment, the blank is trimmed, and internal stress possibly generated in the drying process of the blank tube can be released, so that structural deformation of the fired silicon carbide ceramic tube is avoided. After finishing the trimming, the temperature is continuously reduced, the heat conducting core pipe 4 is cooled to generate volume shrinkage, and the heat conducting core pipe 4 has a thermal expansion rate larger than that of the dry blank pipe, namely, the volume shrinkage of the heat conducting core pipe 4 is larger than that of the dry blank pipe after the temperature is reduced, and the original joint surface is separated due to the difference between inner shrinkage and outer shrinkage, so that the heat conducting core pipe 4 is automatically separated from the dry blank pipe, the pipe can be easily drawn, and the damage to the blank pipe is avoided.
As a further preferable scheme, the cylindrical outer wall of the heat conducting core tube 4 is a cylindrical outer wall, and the thermal expansion coefficient of the heat conducting core tube 4 is 5 multiplied by 10 -6 Per DEG C to 50X 10 -6 and/C. The surface roughness of the cylindrical outer wall of the heat conductive core pipe 4 is less than or equal to 3 μm. The heat conduction core pipe 4 is a metal core pipe, and the heat conduction coefficient of the metal core pipe is more than or equal to 40. In the present embodiment, the heat conductive core pipe 4 is a cylindrical pipe made of carbon steel and has a thermal expansion coefficient of 12×10 6 And the temperature is/DEG C, the secondary roundness shaping effect can be achieved, and the tube drawing can be easily performed after the temperature is reduced. After the carbon steel pipe is polished and polished, the surface roughness of the cylindrical outer wall is between 0.2 mu m and 1 mu m, the outer surface of the cylindrical outer wall reaches higher smoothness, when the blank pipe 5 is combined with the cylindrical outer wall, the smoothness of the inner wall of the dried blank pipe 5 can be improved, and the process of polishing the inner wall after drying is omitted. The heat conduction coefficient of the heat conduction core tube 4 is 45W/(mK), and heat can be uniformly transferred to the blank tube 5 through the tube wall of the heat conduction core tube 4, so that the blank tube 5 is ensured to uniformly volatilize moisture from inside to outside.
In other embodiments, in order to meet different usage requirements, the material of the heat conducting core tube is not limited to carbon steel, but other types of iron alloys can be selected, or the heat conducting core tube can be made of any one of copper and aluminum or alloy materials. Copper and its alloy material have higher coefficient of heat conductivity, can improve the homogeneity of heat transfer in the stoving process, aluminum and aluminum alloy have taken into account the requirements such as heat conductivity, easy processing and cost control. In addition, the thermal expansion coefficient of the heat conduction core tube can be 10 multiplied by 10 6 /℃、25×10 6 /℃、40×10 6 Per DEG C, or 5X 10 -6 Per DEG C to 50X 10 -6 Any other value between every two DEG C can meet the requirement that the heat conduction core pipe is cooled and contracted so as to facilitate drawing. Further, the surface roughness of the cylindrical outer wall of the heat conductive core tube is not limited to 0.2 μm to 1 μm, but may be 0.1 μm, 2 μm or 3 μm, or any value less than or equal to 3 μm.
As a further preferred scheme, the main box body 20 is positioned at the lower part of the blank pipe conveying vehicle 2, the blank pipe bracket 21 is fixedly connected to the upper side of the main box body 20, and a plurality of exhaust ports 23 are distributed on the upper side surface of the main box body 20 at intervals; the blank pipe bracket 21 is provided with a plurality of blank pipe positioning parts which are arranged up and down relative to the corresponding exhaust ports 23, and the blank pipe positioning parts are matched with the second ports 42 in a positioning way. The blank pipe conveying trolley 2 is designed to be arranged up and down in the mode that the exhaust port 23 and the blank pipe positioning part are arranged up and down, when the heat conducting core pipe 4 is installed on the blank pipe conveying trolley 2, the axial direction of the heat conducting core pipe 4 extends vertically, hot air flows into the heat conducting core pipe 4 to circulate vertically upwards, the flow direction of the hot air is parallel to the axial direction of the heat conducting core pipe 4, the uniform heat transfer to the pipe wall of the heat conducting core pipe 4 is ensured, and the roundness and straightness of the dried and prepared blank pipe 5 are improved.
The blank pipe bracket 21 comprises an upper support arm 24, the length direction of the upper support arm 24 is parallel to the upper side surface of the main box body 20, a second port 42 protrudes out of the upper part of the upper support arm 24, and the outer wall of the second port 42 is in abutting fit with the side edge of the upper support arm 24. And, a plurality of pipe clamps are installed on the upper support arm 24 at intervals, and the pipe clamps form blank pipe positioning parts which are matched with the second ports 42 in a positioning way. The blank pipe bracket 21 further comprises a vertical frame 25, the vertical frame 25 is fixedly arranged at one side edge of the main box body 20, a plurality of upper support arms 24 are arranged, the plurality of upper support arms 24 are respectively connected to the upper side of the vertical frame 25, and the plurality of upper support arms 24 are distributed in parallel at intervals.
The blank pipe support 21 is provided with a plurality of upper support arms 24, the upper support arms 24 are provided with a plurality of pipe clamps, the installation positions of rectangular arrays are formed in the horizontal plane of the blank pipe support 21, more heat conduction core pipes 4 and blank pipes 5 can be arranged and installed, more blank pipes 5 can be prepared by one-time drying, and intervals are reserved among the blank pipes 5, so that moisture can be outwards diffused and volatilized, and the installation and the disassembly operations are facilitated. And, the drying room 1 is further provided with a moisture discharging port 11, and the second port 42 is disposed toward the moisture discharging port 11, so that it is ensured that hot moisture generated by drying can be discharged from above the drying room 1.
In the present embodiment, the hot air duct 3 is disposed at the lower portion of the side wall of the drying room 1, the air inlet 22 is disposed at a side position of the main casing 20, and the air inlet 22 and the corresponding air outlet 30 of the hot air duct 3 are at the same height. Defining the moving direction of the blank pipe conveying vehicle 2 as the front-back direction, arranging two rails 12 extending back and forth at the bottom of the drying room 1, rolling and matching with rollers 26 at the bottom of the blank pipe conveying vehicle 2, arranging hot air pipelines 3 on two side walls of the drying room 1 in bilateral symmetry, arranging a left side air inlet and a right side air inlet on two sides of the main box 20 respectively, wherein the left side air inlet corresponds to the left hot air pipeline 3, and the right side air inlet corresponds to the right hot air pipeline 3.
After the blank pipe carrier 2 enters the set position of the drying room 1, hot air is respectively input into the left hot air pipeline 3 and the right hot air pipeline 3 through the blower, the left hot air pipeline is connected with the left air inlet of the main box 20 through the corrugated pipe 31, the right hot air pipeline is connected with the right air inlet of the main box 20 through the corrugated pipe 31, namely hot air flows into the main box 20 from the left side and the right side respectively, so that the uniformity of the internal heat of the whole main box 20 is ensured, the heat balance of the hot air flowing into the heat conducting core pipe 4 from the different exhaust ports 23 is further ensured, and finally the aim of synchronously drying the blank pipe 5 and the dryness uniformity of the blank pipe 5 is realized.
The extrusion molding machine 6 comprises a vertical frame 60, an extrusion mechanism and a molding die 62, as shown in fig. 3, the extrusion mechanism and the molding die 62 are both arranged on the upper part of the vertical frame 60, the extrusion mechanism is provided with a piston, the molding die 62 is provided with a feeding channel and a molding discharging hole, and the piston 610 is in sliding sealing fit with the feeding channel; the shaping discharge gate sets up downwards, and the lower part of vertical frame 60 still is equipped with the base, and the base is located the shaping discharge gate under, and the removable heat conduction core pipe 4 that installs between base and the shaping discharge gate, the cylindricality outer wall of heat conduction core pipe 4 be used for with extrusion molding's base pipe 5 inner wall slip laminating.
The extrusion molding machine 6 applies pressure to the raw materials of the green body through the extrusion mechanism, and the piston 610 of the extrusion mechanism is in movable sealing fit with the feeding channel of the molding die 62, so that the raw materials of the green body can only be discharged from the molding discharge port, and the purpose of continuous extrusion molding of the blank pipe is realized because the extrusion work is continuous. And the molding discharge hole is arranged downwards, so that the blank pipe is extruded from top to bottom, the gravity direction of the blank pipe 5 is consistent with the axis direction of the blank pipe, and the straightness of the extruded blank pipe can be ensured.
A heat conducting core pipe 4 is detachably arranged between the base and the forming discharge hole, the axis direction of the heat conducting core pipe 4 and the forming discharge hole are coaxially arranged, a blank pipe 5 can be sleeved on the heat conducting core pipe 4 in a sliding manner from top to bottom, the cylindrical outer wall of the heat conducting core pipe 4 is in sliding fit with the inner wall of the extruded blank pipe, the heat conducting core pipe 4 plays a role in supporting and shaping the inside of the blank pipe 5, the condition that the blank pipe 5 is locally contracted and deformed after extrusion is avoided, and roundness and straightness in the preparation process of the blank pipe 5 are guaranteed. In addition, the gravity of the blank pipe 5 can be counteracted with the sliding friction force received when the blank pipe 5 slides, and the problem that the continuously extruded blank pipe is accumulated and wrinkled due to overlarge clamping resistance can be avoided in the process that the blank pipe 5 slides downwards along the heat conducting core pipe 4.
As a further preferable aspect, the outer part of the heat conducting core tube 4 is also detachably provided with a blank tube clamp 43, and the blank tube clamp 43 is used for clamping on the outer part of the clamping section of the extruded blank tube. And, vertical sliding mechanism 44 is still equipped with to the downside of vertical frame 60, and vertical sliding mechanism 44 and heat conduction core 4 parallel interval set up, install slider 45 on the vertical sliding mechanism 44, and base pipe clamp 13 links to each other with slider 45.
When the blank pipe 5 is extruded from the forming discharge hole for a small section, the small section is extruded first to be cut off to form an independent part, and the independent part forms a clamping section of the blank pipe, and the clamping section slides downwards along with the subsequently extruded blank pipe synchronously. The blank pipe clamp 13 is arranged outside the clamping section of the blank pipe, and the clamping force can deform the part, so that only the clamping section of the blank pipe can be abandoned later, and the extrusion molding precision of the whole blank pipe is ensured. The height position of the clamping section also indicates the extrusion length of the blank pipe, and the blank pipe clamp 13 and the sliding block of the vertical sliding mechanism 44 move synchronously, so that the extrusion length of the blank pipe 5 can be conveniently determined.
The preparation system of the silicon carbide ceramic tube further comprises a controller, a position sensor is further arranged on the vertical sliding mechanism 44, and the controller is respectively and electrically connected with the position sensor and the extrusion mechanism. The vertical frame 60 is also provided with a cutter 66, the cutting surface of the cutter 66 is perpendicular to the axis direction of the forming discharge hole, and the controller is also electrically connected with the cutter 66 to control the cutter 66 to cut off the blank pipe when the length of the extruded blank pipe reaches a set value.
The preparation length of the blank pipe is preset on the control panel, the position of the sliding block 45 is detected in real time through the position sensor, the preparation length of the blank pipe is determined according to the sliding block 45, and when the extrusion length of the blank pipe reaches a set value, the controller controls the cutter 66 to cut off the blank pipe, so that the extrusion length of the blank pipe 5 is accurately controlled.
The extrusion mechanism is a hydraulic extrusion mechanism and comprises a fixed seat 63, a hydraulic oil cylinder 61 and an oil pump 64, wherein the fixed seat 63 is arranged on the upper part of the vertical frame 60, the hydraulic oil cylinder 61 is arranged on the fixed seat 63, and an oil delivery pipe 65 is communicated between the oil pump 64 and the hydraulic oil cylinder 61. Specifically, the cylinder body 611 of the hydraulic cylinder is connected to the fixing base 63, the push rod 612 of the hydraulic cylinder penetrates through the fixing base 63 and extends to the lower side of the fixing base 63, and the piston 610 is mounted at the end of the push rod 612 of the hydraulic cylinder. In addition, a feed hopper 620 is provided on the upper side of the feed channel, and the feed hopper 620 is engaged with the piston 610.
In other specific embodiments of the preparation system of the silicon carbide ceramic tube, a matching mechanism can be added on the basis of the specific embodiment 1, and the preparation system of the silicon carbide ceramic tube further comprises a semi-finished product polishing machine 7, as shown in fig. 4 and 5, the semi-finished product polishing machine 7 comprises an outer shell 70, a grinding tool 71 and a driving motor 72, a conveying channel 700 for axially moving the semi-finished product blank tube 5a is arranged in the outer shell 70, the grinding tool 71 is rotatably arranged in the outer shell 70, the rotation axis of the grinding tool 71 and the conveying channel 700 are coaxially arranged, and the driving motor 72 is in transmission connection with the grinding tool 71.
As a further preferable scheme, a transmission cylinder 73 is rotatably installed in the outer casing 70, a grinding tool jacket 74 is fixedly connected to the end part of the transmission cylinder 73, the grinding tool 71 is detachably installed on the grinding tool jacket 74, a conveying channel 700 is formed in the transmission cylinder 73, and a driving motor 72 is in belt transmission connection with the transmission cylinder 73. In addition, the outer casing 70 is further provided with a dust interface 75, and the dust interface 75 is connected with a dust suction mechanism.
The semi-finished product polisher 7 can polish the dried blank pipe which is still in a high-temperature stage after drying, the high-temperature stage is 60-80 ℃, the blank pipe and the heat conduction core pipe 4 still keep a tight combination state because the blank is still in the high-temperature stage, a supporting part is quite arranged in the blank repairing process, and the risk of damage to the blank pipe caused by the blank repairing process is reduced. At the moment, the blank is trimmed, and internal stress possibly generated in the drying process of the blank tube can be released, so that structural deformation of the fired silicon carbide ceramic tube is avoided.
The specific examples of the drying and shaping machine for the silicon carbide ceramic tube of the invention are the same as the specific examples of the drying and shaping machine in the preparation system for the silicon carbide ceramic tube in the specific implementation mode of the preparation system for the silicon carbide ceramic tube of the invention. The drying and shaping machine for the silicon carbide ceramic tube comprises a drying room 1, a blank tube conveying vehicle 2 and a hot air device, wherein the blank tube conveying vehicle 2 is movably arranged in the drying room 1, a hot air pipeline 3 is arranged in the drying room 1, and the hot air device is connected with the hot air pipeline 3; the blank pipe conveying vehicle 2 comprises a main box body 20, a blank pipe support 21 and a heat conducting core pipe 4, wherein the blank pipe support 21 is fixedly connected with the main box body 20, and the heat conducting core pipe 4 is detachably arranged on the blank pipe support 21.
The main box 20 is provided with an air inlet 22 and a plurality of air outlets 23, the air inlet 22 is detachably communicated with the hot air pipeline 3, and the plurality of air outlets 23 are distributed on one side surface of the main box 20; the heat conduction core tube 4 is provided with a first port 41 and a second port 42, the first port 41 is in plug-in fit with the exhaust port 23, the drying room 1 is also provided with a moisture exhaust port 11, and the second port 42 is arranged towards the moisture exhaust port 11; a hot air channel is formed inside the heat conductive core tube 4 to communicate the air outlet 23 and the moisture outlet 11; the heat conducting core pipe 4 is further provided with a cylindrical outer wall, the cylindrical outer wall of the heat conducting core pipe 4 is used for being attached to the blank pipe 5, and the thermal expansion rate of the heat conducting core pipe 4 is larger than the drying shrinkage rate of the blank pipe 5.
The drying and shaping machine for the silicon carbide ceramic tube adopts the design form of a drying room 1, a blank tube conveying vehicle 2 and a hot air device, wherein the blank tube conveying vehicle 2 is movably arranged in the drying room 1, a whole batch of blank tubes 5 can be conveyed into the drying room 1 through the blank tube conveying vehicle 2, and the whole batch of blank tubes are moved out of the drying room 1 after the drying is finished; the hot air device is connected with the hot air pipeline 3 of the drying room 1, the hot air device generates hot air with drying temperature and conveys the hot air to the hot air pipeline 3, and the hot air transmits heat to the wet blank pipe through the main box body 20 and the heat conducting core pipe 4, so that the drying and shaping effects are achieved.
Because the blank pipe conveying vehicle 2 comprises a main box body 20, a blank pipe support 21 and a heat conducting core pipe 4, the blank pipe support 21 is fixedly connected with the main box body 20, the heat conducting core pipe 4 is detachably arranged on the blank pipe support 21, and the cylindrical outer wall of the heat conducting core pipe 4 is attached to the blank pipe 5. Namely, the blank pipe 5 is directly sleeved outside the heat conduction core pipe 4, and the inner surface of the blank pipe 5 is attached to the cylindrical outer wall of the heat conduction core pipe 4; the heat conducting core pipe 4 and the wet blank pipe are combined together through adhesive force and friction force, the heat conducting core pipe 4 plays a role in supporting and shaping the wet blank pipe, and the wet blank pipe is prevented from local slumping or dent deformation in the drying process.
During drying, the first port 41 of the heat conducting core pipe 4 is inserted into the exhaust port 23 of the main box 20, hot air flows into the heat conducting core pipe 4 from the exhaust port 23 of the main box 20, flows continuously along the hot air channel of the heat conducting core pipe 4, flows out from the second port 42 of the heat conducting core pipe 4 and finally is discharged through the moisture discharge port 11. Because the heat of the hot air flow is conducted to the pipe wall of the heat conducting core pipe 4 when the hot air flows in the heat conducting core pipe 4, the good heat conductivity of the heat conducting core pipe 4 ensures that the temperature of the inner wall of the blank pipe 5 reaches a uniform state. And the heat is evenly dispersed and transferred outwards from the inner wall of the blank pipe 5 in a central radiation mode, the volatilization of the moisture is also diffused from the inner wall of the blank pipe 5 to the outer wall, namely, the heat conduction direction is consistent with the volatilization diffusion direction of the moisture, the heat distribution consistency at different positions along the axis direction is good, the uniform heat transfer is not influenced even if the length of the blank pipe is large, the generation of local internal stress caused by uneven shrinkage in the drying process of the blank pipe can be greatly avoided, and the higher accuracy and straightness of the cross section shape of the dried blank pipe are ensured.
Meanwhile, in the drying process, as the heat conducting core pipe 4 always exists in the blank pipe 5, the heat conducting core pipe 4 is heated to generate volume expansion, the wet blank pipe is dried to generate volume contraction, so that the inner wall of the blank pipe 5 is more fully and tightly combined with the heat conducting core pipe 4, the thermal expansion rate and the drying contraction rate are far smaller than the dimensional precision of the blank pipe 5, the further cross section shape shaping effect is generated on the wet blank pipe in the drying process, the smoothness and the dimensional precision of the inner wall of the blank pipe 5 can be improved through the cylindrical outer wall of the heat conducting core pipe 4, the process of polishing the inner wall of the blank pipe 5 again after drying is omitted, the precision and the straightness of the cross section shape of the blank pipe 5 after drying are ensured, and particularly the yield of preparing the large-size silicon carbide ceramic pipe is remarkably improved.
When the drying is still in the high-temperature stage, the high-temperature stage is 60-80 ℃, the dry blank pipe and the heat conduction core pipe 4 are kept in a tightly combined state, and the dry blank pipe in the high-temperature stage is polished at the moment, which is equivalent to that a supporting part is arranged in the dry blank pipe, so that the risk of damage to the blank pipe in the blank repairing process is reduced. At the moment, the blank is trimmed, and internal stress possibly generated in the drying process of the blank tube can be released, so that structural deformation of the fired silicon carbide ceramic tube is avoided. After finishing the trimming, the temperature is continuously reduced, the heat conducting core pipe 4 is cooled to generate volume shrinkage, and the heat conducting core pipe 4 has a thermal expansion rate larger than that of the dry blank pipe, namely, the volume shrinkage of the heat conducting core pipe 4 is larger than that of the dry blank pipe after the temperature is reduced, and the original joint surface is separated due to the difference between inner shrinkage and outer shrinkage, so that the heat conducting core pipe 4 is automatically separated from the dry blank pipe, the pipe can be easily drawn, and the damage to the blank pipe is avoided.
As a further preferable scheme, the cylindrical outer wall of the heat conducting core tube 4 is a cylindrical outer wall, and the thermal expansion coefficient of the heat conducting core tube 4 is 5 multiplied by 10 -6 Per DEG C to 50X 10 -6 and/C. The surface roughness of the cylindrical outer wall of the heat conductive core pipe 4 is less than or equal to 3 μm. The heat conduction core pipe 4 is a metal core pipe, and the heat conduction coefficient of the metal core pipe is more than or equal to 40. In the present embodiment, the heat conductive core pipe 4 is a cylindrical pipe made of carbon steel and has a thermal expansion coefficient of 12×10 6 And the temperature is/DEG C, the secondary roundness shaping effect can be achieved, and the tube drawing can be easily performed after the temperature is reduced. After the carbon steel pipe is polished and ground,the surface roughness of the cylindrical outer wall is between 0.2 mu m and 1 mu m, the outer surface of the cylindrical outer wall reaches higher smoothness, when the blank pipe 5 is combined with the cylindrical outer wall, the smoothness of the inner wall of the dried blank pipe 5 can be improved, and the process of polishing the inner wall after drying is omitted. The heat conduction coefficient of the heat conduction core tube 4 is 45W/(mK), and heat can be uniformly transferred to the blank tube 5 through the tube wall of the heat conduction core tube 4, so that the blank tube 5 is ensured to uniformly volatilize moisture from inside to outside.
In other embodiments, in order to meet different usage requirements, the material of the heat conducting core tube is not limited to carbon steel, but other types of iron alloys can be selected, or the heat conducting core tube can be made of any one of copper and aluminum or alloy materials. Copper and its alloy material have higher coefficient of heat conductivity, can improve the homogeneity of heat transfer in the stoving process, aluminum and aluminum alloy have taken into account the requirements such as heat conductivity, easy processing and cost control. In addition, the thermal expansion coefficient of the heat conduction core tube can be 10 multiplied by 10 6 /℃、25×10 6 /℃、40×10 6 Per DEG C, or 5X 10 -6 Per DEG C to 50X 10 -6 Any other value between every two DEG C can meet the requirement that the heat conduction core pipe is cooled and contracted so as to facilitate drawing. Further, the surface roughness of the cylindrical outer wall of the heat conductive core tube is not limited to 0.2 μm to 1 μm, but may be 0.1 μm, 2 μm or 3 μm, or any value less than or equal to 3 μm.
As a further preferred scheme, the main box body 20 is positioned at the lower part of the blank pipe conveying vehicle 2, the blank pipe bracket 21 is fixedly connected to the upper side of the main box body 20, and a plurality of exhaust ports 23 are distributed on the upper side surface of the main box body 20 at intervals; the blank pipe bracket 21 is provided with a plurality of blank pipe positioning parts which are arranged up and down relative to the corresponding exhaust ports 23, and the blank pipe positioning parts are matched with the second ports 42 in a positioning way. The blank pipe conveying trolley 2 is designed to be arranged up and down in the mode that the exhaust port 23 and the blank pipe positioning part are arranged up and down, when the heat conducting core pipe 4 is installed on the blank pipe conveying trolley 2, the axial direction of the heat conducting core pipe 4 extends vertically, hot air flows into the heat conducting core pipe 4 to circulate vertically upwards, the flow direction of the hot air is parallel to the axial direction of the heat conducting core pipe 4, the uniform heat transfer to the pipe wall of the heat conducting core pipe 4 is ensured, and the roundness and straightness of the dried and prepared blank pipe 5 are improved.
The blank pipe bracket 21 comprises an upper support arm 24, the length direction of the upper support arm 24 is parallel to the upper side surface of the main box body 20, a second port 42 protrudes out of the upper part of the upper support arm 24, and the outer wall of the second port 42 is in abutting fit with the side edge of the upper support arm 24. And, a plurality of pipe clamps are installed on the upper support arm 24 at intervals, and the pipe clamps form blank pipe positioning parts which are matched with the second ports 42 in a positioning way. The blank pipe bracket 21 further comprises a vertical frame 25, the vertical frame 25 is fixedly arranged at one side edge of the main box body 20, a plurality of upper support arms 24 are arranged, the plurality of upper support arms 24 are respectively connected to the upper side of the vertical frame 25, and the plurality of upper support arms 24 are distributed in parallel at intervals.
The blank pipe support 21 is provided with a plurality of upper support arms 24, the upper support arms 24 are provided with a plurality of pipe clamps, the installation positions of rectangular arrays are formed in the horizontal plane of the blank pipe support 21, more heat conduction core pipes 4 and blank pipes 5 can be arranged and installed, more blank pipes 5 can be prepared by one-time drying, and intervals are reserved among the blank pipes 5, so that moisture can be outwards diffused and volatilized, and the installation and the disassembly operations are facilitated. And, the drying room 1 is further provided with a moisture discharging port 11, and the second port 42 is disposed toward the moisture discharging port 11, so that it is ensured that hot moisture generated by drying can be discharged from above the drying room 1.
In the present embodiment, the hot air duct 3 is disposed at the lower portion of the side wall of the drying room 1, the air inlet 22 is disposed at a side position of the main casing 20, and the air inlet 22 and the corresponding air outlet 30 of the hot air duct 3 are at the same height. Defining the moving direction of the blank pipe conveying vehicle 2 as the front-back direction, arranging two rails 12 extending back and forth at the bottom of the drying room 1, rolling and matching with rollers 26 at the bottom of the blank pipe conveying vehicle 2, arranging hot air pipelines 3 on two side walls of the drying room 1 in bilateral symmetry, arranging a left side air inlet and a right side air inlet on two sides of the main box 20 respectively, wherein the left side air inlet corresponds to the left hot air pipeline 3, and the right side air inlet corresponds to the right hot air pipeline 3.
After the blank pipe carrier 2 enters the set position of the drying room 1, hot air is respectively input into the left hot air pipeline 3 and the right hot air pipeline 3 through the blower, the left hot air pipeline is connected with the left air inlet of the main box 20 through the corrugated pipe 31, the right hot air pipeline is connected with the right air inlet of the main box 20 through the corrugated pipe 31, namely hot air flows into the main box 20 from the left side and the right side respectively, so that the uniformity of the internal heat of the whole main box 20 is ensured, the heat balance of the hot air flowing into the heat conducting core pipe 4 from the different exhaust ports 23 is further ensured, and finally the aim of synchronously drying the blank pipe 5 and the dryness uniformity of the blank pipe 5 is realized.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (23)
1. The drying and shaping machine for the silicon carbide ceramic tube is characterized by comprising a drying room, a blank tube conveying vehicle and a hot air device, wherein the blank tube conveying vehicle is movably arranged in the drying room, a hot air pipeline is arranged in the drying room, the hot air device is connected with the hot air pipeline, the hot air device is used for generating hot air flow with drying temperature and conveying the hot air flow into the hot air pipeline, and the hot air flow transmits heat to a wet blank tube through a main box body and a heat conducting core tube;
the blank pipe conveying vehicle comprises a main box body, a blank pipe support and a heat conduction core pipe, wherein the blank pipe support is fixedly connected with the main box body, and the heat conduction core pipe is detachably arranged on the blank pipe support;
the main box body is provided with an air inlet and a plurality of air outlets, the air inlet is detachably communicated with the hot air pipeline, and the plurality of air outlets are distributed on one side surface of the main box body;
The heat conduction core tube is provided with a first port and a second port, and the first port is in plug-in fit with the exhaust port; a hot air channel is formed in the heat conduction core tube so as to conduct the exhaust port and the second port;
the heat conduction core pipe is also provided with a cylindrical outer wall which is used for being attached to the blank pipe, and the inner wall of the blank pipe is tightly combined with the cylindrical outer wall in the drying process so as to generate a shaping effect of the cross section shape of the blank pipe; the heat-conducting core pipe has a thermal expansion rate larger than that of the dry blank pipe, so that the original joint surfaces are separated through the difference of internal and external shrinkage after the temperature is reduced.
2. The drying and shaping machine for silicon carbide ceramic tubes according to claim 1, wherein the cylindrical outer wall of the heat conducting core tube is a cylindrical outer wall, and the heat conducting core tube has a thermal expansion coefficient of 5×10 -6 Per DEG C to 50X 10 -6 between/deg.C.
3. The drying and shaping machine for silicon carbide ceramic tubes according to claim 2, wherein the surface roughness of the cylindrical outer wall of the heat conducting core tube is 3 μm or less.
4. The drying and shaping machine for silicon carbide ceramic tubes according to claim 1, wherein the heat conducting core tube is a metal core tube, and the heat conducting coefficient of the metal core tube is greater than or equal to 40.
5. The drying and shaping machine for silicon carbide ceramic tubes according to claim 1, wherein the main box body is positioned at the lower part of the blank tube conveying vehicle, the blank tube bracket is fixedly connected to the upper side of the main box body, and a plurality of exhaust ports are distributed on the upper side surface of the main box body at intervals;
the blank pipe support is provided with a plurality of blank pipe positioning parts, the blank pipe positioning parts are arranged up and down relative to the corresponding exhaust ports, and the blank pipe positioning parts are matched with the second ports in a positioning mode.
6. The machine of claim 5, wherein the blank pipe support comprises an upper support arm, the length direction of the upper support arm is parallel to the upper side surface of the main box body, the second port protrudes out of the upper part of the upper support arm, and the outer wall of the second port is in abutting fit with the side edge of the upper support arm.
7. The machine of claim 6, wherein a plurality of pipe clamps are installed on the upper support arm at intervals, and the pipe clamps form blank pipe positioning parts matched with the second port in a clamping manner.
8. The drying and shaping machine for silicon carbide ceramic tubes according to claim 7, wherein the blank tube support further comprises a vertical frame, the vertical frame is fixedly arranged at one side edge of the main box body, a plurality of upper support arms are arranged, the upper support arms are respectively connected to the upper sides of the vertical frame, and the upper support arms are distributed in parallel and at intervals.
9. The drying and sizing machine for silicon carbide ceramic tubes according to claim 5, wherein the upper portion of the drying chamber is further provided with a moisture exhaust port, and the second port is disposed toward the moisture exhaust port.
10. The drying and shaping machine for silicon carbide ceramic tubes according to claim 1, wherein the hot air pipe is arranged at the lower part of the side wall of the drying room, the air inlet is arranged at the side surface of the main box body, and the air inlet and the corresponding air outlet of the hot air pipe are at the same height.
11. The machine for drying and shaping silicon carbide ceramic tubes according to claim 10, wherein the moving direction of the blank tube transporting vehicle is a front-back direction, two side walls of the drying room are symmetrically provided with hot air pipelines respectively, the outer contour of the main box body is cuboid, two sides of the main box body are respectively provided with a left side air inlet and a right side air inlet, the left side air inlet corresponds to the left hot air pipeline, and the right side air inlet corresponds to the right hot air pipeline.
12. The drying and shaping machine for silicon carbide ceramic tubes according to claim 1, wherein the heat conducting core tube is made of any one of copper and aluminum or any one of alloy materials of copper, iron and aluminum.
13. A system for preparing a silicon carbide ceramic tube, comprising an extrusion molding machine and a drying and shaping machine, wherein the drying and shaping machine is a drying and shaping machine of the silicon carbide ceramic tube according to any one of claims 1 to 12;
the extrusion molding machine comprises a vertical frame, an extrusion mechanism and a molding die, wherein the extrusion mechanism and the molding die are both arranged on the upper part of the vertical frame, the extrusion mechanism is provided with a piston, the molding die is provided with a feeding channel and a molding discharge hole, and the piston is in sliding sealing fit with the feeding channel;
the forming discharge port is arranged downwards, a base is further arranged at the lower part of the vertical frame, the base is located right below the forming discharge port, a heat conduction core tube is detachably arranged between the base and the forming discharge port, and the cylindrical outer wall of the heat conduction core tube is used for being in sliding fit with the inner wall of the extruded blank tube.
14. The system for preparing a silicon carbide ceramic tube according to claim 13, wherein a billet clamp is detachably mounted on the outer portion of the heat conducting core tube, and the billet clamp is used for clamping on the outer portion of the clamping section of the extruded billet tube.
15. The system for preparing a silicon carbide ceramic tube according to claim 14, wherein a vertical sliding mechanism is further arranged on the lower side of the vertical frame, the vertical sliding mechanism and the heat conducting core tube are arranged at intervals in parallel, a sliding block is mounted on the vertical sliding mechanism, and the blank tube clamp is connected with the sliding block.
16. The system for preparing a silicon carbide ceramic tube according to claim 15, further comprising a controller, wherein the vertical sliding mechanism is further provided with a position sensor, and the controller is electrically connected with the position sensor and the extrusion mechanism respectively.
17. The system for producing silicon carbide ceramic tube according to claim 16, wherein a cutter is further mounted on the vertical frame, a cut surface of the cutter is perpendicular to an axial direction of the molding outlet, and the controller is electrically connected to the cutter to control the cutter to cut off the raw tube when a length of the extruded raw tube reaches a set value.
18. The system for preparing a silicon carbide ceramic tube according to claim 13, wherein the extrusion mechanism is a hydraulic extrusion mechanism comprising a fixed seat, a hydraulic cylinder and an oil pump, wherein the fixed seat is mounted on the upper portion of the vertical frame, the hydraulic cylinder is mounted on the fixed seat, and an oil delivery pipe is communicated between the oil pump and the hydraulic cylinder.
19. The system of claim 18, wherein the cylinder body of the hydraulic cylinder is connected to the fixing base, the push rod of the hydraulic cylinder penetrates through the fixing base and extends to the lower side of the fixing base, and the piston is mounted at the end of the push rod of the hydraulic cylinder.
20. The system for preparing a silicon carbide ceramic tube according to claim 13, wherein a feed hopper is further provided on an upper side of the feed channel, the feed hopper being engaged with the piston.
21. The system for preparing a silicon carbide ceramic tube according to claim 13, further comprising a semi-finished product grinder, wherein the semi-finished product grinder comprises an outer shell, a grinding tool and a driving motor, a conveying channel for axially moving a semi-finished product blank tube is arranged in the outer shell, the grinding tool is rotatably installed in the outer shell, a rotation axis of the grinding tool is coaxially arranged with the conveying channel, and the driving motor is in transmission connection with the grinding tool.
22. The system for preparing a silicon carbide ceramic tube according to claim 21, wherein a transmission cylinder is rotatably installed in the outer casing, a grinding tool jacket is fixedly connected to an end portion of the transmission cylinder, the grinding tool is detachably installed on the grinding tool jacket, the transmission cylinder is internally provided with the conveying channel, and the driving motor is in belt transmission connection with the transmission cylinder.
23. The system for preparing a silicon carbide ceramic tube according to claim 21, wherein the outer housing is further provided with a dust interface, and wherein the dust interface is connected with a dust suction mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310654958.1A CN116766371B (en) | 2023-06-05 | 2023-06-05 | Drying and shaping machine and preparation system for silicon carbide ceramic tube |
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| CN118084497B (en) * | 2024-04-22 | 2024-07-19 | 浙江吉成新材股份有限公司 | Silicon carbide tube and preparation method thereof |
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