CN108562607B - Self-ignition tube furnace - Google Patents
Self-ignition tube furnace Download PDFInfo
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- CN108562607B CN108562607B CN201810162164.2A CN201810162164A CN108562607B CN 108562607 B CN108562607 B CN 108562607B CN 201810162164 A CN201810162164 A CN 201810162164A CN 108562607 B CN108562607 B CN 108562607B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/12—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of critical point; of other phase change
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/02—Furnaces of a kind not covered by any preceding group specially designed for laboratory use
Abstract
The invention discloses a self-ignition tube furnace, which is characterized in that: comprises a temperature measuring device, a heating device, a heat insulation device, an accessory device and a furnace body; the temperature measuring device monitors the reaction temperature in the furnace body and adjusts the reaction temperature in time; the furnace body is used for placing a tested substance to react; the heating device heats the tested substances in the furnace body to reach the required temperature; the heat insulation device is coated around the furnace body, so that heat loss is reduced; the auxiliary device supports the furnace body, the temperature measuring device, the heating device and the heat insulation device; the invention overcomes the defects of the prior art and provides the self-ignition tube furnace with high detection precision, high efficiency and good safety.
Description
Technical Field
The invention relates to the field of self-ignition temperature monitoring, in particular to a self-ignition tube furnace.
Background
The self-ignition temperature is the lowest temperature at which a substance can self-ignite in air under the condition of no spark or flame, is an important physicochemical parameter related to the safety of the substance, and can judge whether the self-ignition of the article occurs in the production, storage and transportation processes through the self-ignition point. Safety control conditions can be determined according to the height of the natural point. The control of the self-ignition furnace temperature is the core capability of various test instruments. The existing self-ignition tube furnace in the domestic market is low in detection precision, efficiency and safety. The existing equipment is difficult to meet the verification requirements, and the market is urgent to meet the standard requirements, and is suitable for detection equipment developed in the age to detect the dangerous characteristics of the substances and classify the substances in the package.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides the self-ignition tube furnace for accurate test.
The technical scheme of the invention is as follows:
a self-ignition tube furnace comprises a temperature measuring device, a heating device, a heat insulation device, an accessory device and a furnace body; the temperature measuring device monitors the reaction temperature in the furnace body and adjusts the reaction temperature in time; the furnace body is used for placing a tested substance to react; the heating device heats the tested substances in the furnace body to reach the required temperature; the heat insulation device is coated around the furnace body, so that heat loss is reduced; the auxiliary device supports the furnace body, the temperature measuring device, the heating device and the heat insulation device;
wherein, the furnace body further includes:
a furnace body and a furnace cover; the shape of the furnace body is cylindrical, the outer diameter is 400 mm, and the height is 600 mm; the wall thickness of the furnace body is 5 mm, and high-quality low alloy steel is adopted; the outer diameter of the furnace cover is 160 mm, and the height of the furnace cover is 200 mm; the top of the furnace cover is provided with a clamping groove along the edge; the lower part of the furnace cover is connected with the furnace body in an elliptical end socket mode; a round hole with the diameter of 60 mm is formed in the top of the furnace cover, and a bracket is arranged in the middle of the round hole and used for fixing the fourth thermocouple; a reactant placing container is arranged below the furnace cover; a clamping groove is formed in the upper edge of the furnace body and is matched with the furnace cover;
wherein, the temperature measuring device further includes:
the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple; the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple are divided into three sections, the diameters of the outer sleeves are respectively 12 mm, 20 mm and 16 mm, and the corresponding lengths of the outer sleeves are respectively 20 mm, 75 mm and 35 mm; the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple are internally wound with spiral thermocouple wires; the second thermocouple is arranged in the middle of the side face of the furnace body; the third thermocouple is arranged at the upper part of the side surface of the furnace body; the fourth thermocouple is arranged at the top of the furnace cover; one end of the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple is tightly adhered to the surface of the furnace body;
wherein the heating device further comprises:
a lower layer heating plate, a ceramic heating ring and an upper cover heating plate; the upper cover heating piece is a ring with the outer diameter of 320 mm, the inner diameter of 170 mm and the thickness of 20 mm, and is placed at the joint of the furnace cover and the furnace body to clamp the upper section of the furnace body and tightly cling to the lower surface of the furnace cover; the upper cover heating plate is provided with three holes with the diameter of 15 mm, the distance between every two adjacent holes is 120 DEG, and the distance between the holes and the circle center is 120 mm; the diameter of the lower heating plate is 380 mm, the thickness of the lower heating plate is 30 mm, and the lower heating plate is placed at the bottom of the furnace body; the ceramic heating ring is placed in the middle of the furnace body and wraps the furnace body, the height of the ceramic heating ring is 500 mm, the upper edge is 50 mm away from the upper surface of the furnace body, the lower edge is 50 mm away from the lower surface of the furnace body, and the thickness is 30 mm;
wherein the heat insulating device further comprises:
a lower layer heat insulation plate, an upper cover heat insulation piece and heat insulation cotton; the lower heat insulation plate is a disc with the outer diameter of 450 mm, the thickness of 20 mm, the central area is sunken, and the sunken depth is 30 mm; the diameter of the sinking area of the lower layer heat insulation plate is 350 mm, the plate thickness of the sinking area is 20 mm, a large round hole and six small round holes are formed in the sinking area, the large round hole is formed in the circle center of the sinking area, the diameter is 25 mm, the diameter of the small round hole is 15 mm, the distance from the circle center of the large round hole is 40 mm, and the distance between two adjacent small round holes is 60 degrees; the upper cover heat insulation piece comprises a first upper cover heat insulation piece and a second upper cover heat insulation piece, wherein the first upper cover heat insulation piece and the second upper cover heat insulation piece are installed on the upper surface of the upper cover top cover plate, the diameter of the first upper cover heat insulation piece is 50 mm, the height of the first upper cover heat insulation piece is 60 mm, and the circle center of the second upper cover heat insulation piece is 200 mm away from the circle center of the upper cover top cover plate;
wherein the accessory device further comprises:
the device comprises an upper cover supporting rod, an upper cover top cover plate, a thermocouple fixing piece, a furnace body supporting rod, a first knob and a second knob; the diameter of the upper cover top cover plate is 400 mm, the thickness of the upper cover top cover plate is 40 mm, the center of the circle is hollowed out, the diameter of the hollowed-out area is 160 mm, and the upper cover top cover plate is matched with the clamping groove at the top of the furnace cover; the upper cover supporting rod is divided into an upper section and a lower section, the diameter of the upper section is 20 mm, the height of the upper section is 120 mm, the diameter of the lower section is 15 mm, and the height of the lower section is 30 mm; the upper cover supporting rods are three in number, the upper part of the upper cover supporting rods are in contact with the lower surface of the upper cover top cover plate, and the lower part of the upper cover supporting rods passes through the upper cover heating plate openings to be in contact with the upper end enclosure of the furnace body; the thermocouple fixing piece is arranged below the lower-layer heat insulation plate.
Further, the center of the lower heating plate is provided with a hole with the diameter of 20 mm at the center of the bottom of the heat preservation cotton.
Further, one end of the first thermocouple is fixed on the lower surface of the lower heat insulation plate through the thermocouple fixing piece, the other end of the first thermocouple penetrates through the large round hole of the sinking area of the lower heat insulation plate, the central round hole of the lower heating plate is tightly attached to the central position of the bottom of the furnace body after the central round hole of the bottom of the heat insulation cotton.
Further, the first knob and the second knob are arranged above the upper cover top cover plate.
Further, the thickness of the heat preservation cotton is 20 mm, and the heat preservation cotton is uniformly covered on the surface of the furnace body.
Further, the furnace body support rods are arranged between the lower heating plate and the lower heat insulation plate, wherein the total included angle between every two of the furnace body support rods is 120 degrees, and the distance between the furnace body support rods and the center of the lower heating plate is 150 millimeters horizontally; the diameter of the furnace body supporting rod is 30 mm, and the height of the furnace body supporting rod is 100 mm.
Compared with the prior art, the invention has the advantages that: the furnace body adopts three-region discrete tubular temperature control, so that the temperature field uniformity of the furnace body is ensured; the inside of the furnace body is insulated, and static spark interference is removed; the multi-channel high-precision temperature cascade acquisition control system can realize multi-point self-correction of the furnace temperature; the outer wall of the furnace body is attached with the nanometer micropore heat insulation board, so that heat is prevented from being transferred to the surface of the instrument.
Drawings
FIG. 1 is a schematic view of the mechanism of the self-igniting tube furnace of the present invention;
FIG. 2 is an enlarged view of a portion of the block of FIG. 1;
reference numerals: a thermocouple fixing member 1; a lower heat insulating plate 2; a first thermocouple 3; a lower layer heating plate 4; a ceramic heating ring 5; a second thermocouple 6; a third thermocouple 7; a top cover heating plate 8; an upper cover support bar 9; an upper lid top cover plate 10; an upper cover heat insulator 11; and a fourth thermocouple 12.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1 and 2, in the self-ignition tube furnace, the temperature measuring device monitors the reaction temperature in the furnace body and adjusts the reaction temperature in time; the furnace body is used for placing a tested substance to react; the heating device heats the tested substances in the furnace body to reach the required temperature; the heat insulation device is coated around the furnace body, so that heat loss is reduced; the auxiliary device supports the furnace body, the temperature measuring device, the heating device and the heat insulation device.
The furnace body further comprises: the furnace cover and the furnace body. The shape of the furnace body is cylindrical, the outer diameter is 400 mm, and the height is 600 mm. The furnace body adopts two sections designs, conveniently adds test substance, can maintain better heat preservation effect simultaneously, and the main reaction of test substance takes place the furnace body, furnace body diameter is different, and the heat conductivity is different, better pinning heat, stable test environment. The wall thickness of the furnace body is 5 mm, and high-quality low alloy steel is adopted. The outer diameter of the furnace cover is 160 mm, and the height of the furnace cover is 200 mm. The top of the furnace cover is provided with a clamping groove along the edge; the clamping groove is matched with the upper cover top cover plate 10, and can be effectively fastened. The lower part of the furnace cover is connected with the furnace body in an elliptical end socket mode. The form of the elliptical head can ensure a better stress structure, and from the analysis of mechanical angles, the stress condition of the circular head is best, but the circular head is difficult to manufacture and form, and the elliptical head can better balance the stress requirement and the economic requirement. The top of the furnace cover is provided with a round hole with the diameter of 60 mm, and a bracket is arranged in the middle of the round hole and used for fixing the fourth thermocouple 12. The reactant placing container is arranged below the furnace cover, and the material of the container can be glass or polymer material, so that the harsh reaction conditions can be met, and the material which does not generate interference can be used. The upper edge of the furnace body is provided with a clamping groove which is matched with the furnace cover. When the thermocouple is used, the position of the furnace cover can be flexibly adjusted according to the needs, so that the installation and adjustment of the fourth thermocouple 12 are facilitated.
The temperature measuring device comprises a first thermocouple 3, a second thermocouple 6, a third thermocouple 7 and a fourth thermocouple 12; the outer sleeves of the first thermocouple 3, the second thermocouple 6, the third thermocouple 7 and the fourth thermocouple 12 are divided into three sections, the diameters of the three sections are respectively 12 mm, 20 mm and 16 mm, and the corresponding lengths of the three sections are respectively 20 mm, 75 mm and 35 mm. The first thermocouple 3, the second thermocouple 6, the third thermocouple 7 and the fourth thermocouple 12 are internally wound with spiral thermocouple wires, so that the monitoring capability of temperature is enhanced, and the experimental precision is improved. The second thermocouple 6 is arranged in the middle of the side face of the furnace body; the third thermocouple 7 is arranged at the upper part of the side surface of the furnace body; the fourth thermocouple 12 is mounted on top of the furnace cover. One end of the first thermocouple 3, the second thermocouple 6, the third thermocouple 7 and the fourth thermocouple 12 is tightly attached to the surface of the furnace body, the other end of the first thermocouple is connected with a PID temperature controller, and the PID temperature controller mainly adopts proportional, integral and differential control algorithms and controls the heating device in real time through collected temperature signals. The first thermocouple 3, the second thermocouple 6 and the third thermocouple 7 are used for monitoring the temperature of the furnace body and keeping the temperature uniform. The fourth thermocouple 12 is placed on top of the furnace lid for monitoring the temperature of the test substance.
The heating device comprises a lower layer heating plate 4, a ceramic heating ring 5 and an upper cover heating plate 8. The upper cover heating plate 8 is a ring with the outer diameter of 320 mm, the inner diameter of 170 mm and the thickness of 20 mm, and is placed at the joint of the furnace cover and the furnace body to clamp the upper section of the furnace body and tightly cling to the surface of the lower part of the furnace cover. The upper cover heating plate 8 is in a circular shape, so that heating efficiency is improved. The upper cover heating plate 8 is provided with three holes with the diameter of 15 mm, the distance between every two adjacent holes is 120 degrees, and the distance between the holes and the circle center is 120 mm. The lower heating plate 4 is 380 mm in diameter and 30 mm in thickness and is placed at the bottom of the furnace body. The ceramic heating ring 5 is placed in the middle of the furnace body to wrap the furnace body, the height of the ceramic heating ring 5 is 500 mm, the upper edge is 50 mm away from the upper surface of the furnace body, the lower edge is 50 mm away from the lower surface of the furnace body, and the thickness is 30 mm; the ceramic heating ring 5 is used for heating the furnace body in the test, and can ensure the uniform temperature rise in the heating process due to the large coverage area, so that the temperature is prevented from being uneven, and the final result is deviated.
The heat insulation device comprises a lower heat insulation plate 2, an upper cover heat insulation piece 11 and heat insulation cotton. The lower heat insulation plate 2 is a disc with the outer diameter of 450 mm, the thickness of 20 mm, and the center area is sunken with the sunken depth of 30 mm; the diameter of the sinking area of the lower layer heat insulation plate 2 is 350 mm, the plate thickness of the sinking area is 20 mm, a large round hole and six small round holes are formed in the sinking area, the large round hole is formed in the circle center of the sinking area, the diameter is 25 mm, the diameter of the small round hole is 15 mm, the distance from the circle center of the large round hole is 40 mm, and the distance between two adjacent small round holes is 60 degrees. The small round holes of the lower heat insulation plate 2 are used for improving ventilation condition of the bottom of the furnace body and avoiding local overheating. The upper cover heat insulator 11 comprises a first upper cover heat insulator and a second upper cover heat insulator, wherein the first upper cover heat insulator and the second upper cover heat insulator are installed on the upper surface of the upper cover top cover plate 10, have the diameter of 50 mm and the height of 60 mm. Is placed above the upper cover top cover plate 10, is convenient to take when in use, and moves according to actual needs. The circle center of the first upper cover heat insulation piece and the circle center of the second upper cover heat insulation piece are 200 mm away from the circle center of the upper cover top cover plate 10. The thickness of the heat preservation cotton is 20 mm, the heat preservation cotton is uniformly covered on the surface of the furnace body and is positioned on the outer side of the ceramic heating ring 5, and the heat preservation cotton mainly plays a role in heat preservation and prevents heat from being transferred to the surface of an instrument. It should be noted that the material of the heat insulation cotton may be asbestos, but is not limited to this material.
The auxiliary device comprises an upper cover supporting rod 9, an upper cover top cover plate 10, a thermocouple fixing piece 1, a furnace body supporting rod, a first knob and a second knob. The diameter of the upper cover top cover plate 10 is 400 mm, the thickness is 40 mm, the center of the circle is hollowed out, the diameter of the hollowed-out area is 160 mm, and the hollowed-out area is matched with the clamping groove at the top of the furnace cover. The upper cover supporting rod 9 is divided into an upper section and a lower section, the diameter of the upper section is 20 mm, the height of the upper section is 120 mm, the diameter of the lower section is 15 mm, and the height of the lower section is 30 mm. The upper cover supporting rods 9 are three in number, the upper part of the upper cover supporting rods is in contact with the lower surface of the upper cover top cover plate 10, the lower part of the upper cover supporting rods passes through the holes of the upper cover heating plates 8 to be in contact with the lower surface of the furnace cover, and the upper cover supporting rods mainly play a role in supporting the upper cover top cover plate 10. The thermocouple fixing element 1 is arranged below the lower heat insulation plate 2. The first knob and the second knob are arranged above the upper cover top cover plate 10, and the first knob and the second knob have the function of positioning the lifting height distance of the furnace body.
Preferably, the center of the lower heating plate 4 is provided with a hole with the diameter of 20 mm at the bottom center of the heat preservation cotton. One end of the first thermocouple 3 is fixed on the lower surface of the lower heat insulation plate 2 through the thermocouple fixing piece 1, the other end of the first thermocouple passes through a large round hole in the sinking area of the lower heat insulation plate 2, a central round hole of the lower heating plate 4 is formed, and the first thermocouple is clung to the central position of the bottom of the furnace body after being tightly connected with the central round hole of the bottom of the heat insulation cotton.
Preferably, the furnace body support rod is installed between the lower layer heating plate 4 and the lower layer heat insulation plate 2, and the included angle between every two of the furnace body support rods is 120 degrees, and the included angle is 150 millimeters away from the circle center of the lower layer heating plate 4. The diameter of the furnace body supporting rod is 30 mm, and the height of the furnace body supporting rod is 100 mm. The main function of the furnace body supporting rod is to support the lower layer heating plate 4 to prevent toppling.
Preferably, the upper cover heating plate 8, the upper cover supporting rod 9, the upper cover top cover plate 10, the upper cover heat insulation member 11 and the fourth thermocouple 12 are arranged on the furnace cover, and can move along with the furnace cover, so that the furnace cover is in modularized design, is convenient for later maintenance and is also convenient for operators to use.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the concept of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (4)
1. A self-igniting tube furnace, characterized in that: comprises a temperature measuring device, a heating device, a heat insulation device, an accessory device and a furnace body; the temperature measuring device monitors the reaction temperature in the furnace body and adjusts the reaction temperature in time; the furnace body is used for placing a tested substance to react; the heating device heats the tested substances in the furnace body to reach the required temperature; the heat insulation device is coated around the furnace body, so that heat loss is reduced; the auxiliary device supports the furnace body, the temperature measuring device, the heating device and the heat insulation device;
wherein, the furnace body further includes:
a furnace body and a furnace cover; the shape of the furnace body is cylindrical, the outer diameter is 400 mm, and the height is 600 mm; the wall thickness of the furnace body is 5 mm, and high-quality low alloy steel is adopted; the outer diameter of the furnace cover is 160 mm, and the height of the furnace cover is 200 mm; the top of the furnace cover is provided with a clamping groove along the edge; the lower part of the furnace cover is connected with the furnace body in an elliptical end socket mode; the top of the furnace cover is provided with a round hole with the diameter of 60 mm, and a bracket is arranged in the middle of the round hole and used for fixing a fourth thermocouple; a reactant placing container is arranged below the furnace cover; a clamping groove is formed in the upper edge of the furnace body and is matched with the furnace cover;
wherein, the temperature measuring device further includes:
the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple; the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple are divided into three sections, the diameters of the outer sleeves are respectively 12 mm, 20 mm and 16 mm, and the corresponding lengths of the outer sleeves are respectively 20 mm, 75 mm and 35 mm; the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple are internally wound with spiral thermocouple wires; the second thermocouple is arranged in the middle of the side face of the furnace body; the third thermocouple is arranged at the upper part of the side surface of the furnace body; the fourth thermocouple is arranged at the top of the furnace cover; one end of the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple is tightly adhered to the surface of the furnace body;
wherein the heating device further comprises:
a lower layer heating plate, a ceramic heating ring and an upper cover heating plate; the upper cover heating piece is a ring with the outer diameter of 320 mm, the inner diameter of 170 mm and the thickness of 20 mm, and is placed at the joint of the furnace cover and the furnace body to clamp the upper section of the furnace body and tightly cling to the lower surface of the furnace cover; the upper cover heating plate is provided with three holes with the diameter of 15 mm, the distance between every two adjacent holes is 120 DEG, and the distance between the holes and the circle center is 120 mm; the diameter of the lower heating plate is 380 mm, the thickness of the lower heating plate is 30 mm, and the lower heating plate is placed at the bottom of the furnace body; the ceramic heating ring is placed in the middle of the furnace body and wraps the furnace body, the height of the ceramic heating ring is 500 mm, the upper edge is 50 mm away from the upper surface of the furnace body, the lower edge is 50 mm away from the lower surface of the furnace body, and the thickness is 30 mm;
wherein the heat insulating device further comprises:
a lower layer heat insulation plate, an upper cover heat insulation piece and heat insulation cotton; the lower heat insulation plate is a disc with the outer diameter of 450 mm, the thickness of 20 mm, the central area is sunken, and the sunken depth is 30 mm; the diameter of the sinking area of the lower layer heat insulation plate is 350 mm, the plate thickness of the sinking area is 20 mm, a large round hole and six small round holes are formed in the sinking area, the large round hole is formed in the circle center of the sinking area, the diameter is 25 mm, the diameter of the small round hole is 15 mm, the distance from the circle center of the large round hole is 40 mm, and the distance between two adjacent small round holes is 60 degrees; the upper cover heat insulation piece comprises a first upper cover heat insulation piece and a second upper cover heat insulation piece, wherein the first upper cover heat insulation piece and the second upper cover heat insulation piece are arranged on the upper surface of the upper cover top cover plate, the diameter of the second upper cover heat insulation piece is 50 mm, the height of the second upper cover heat insulation piece is 60 mm, and the distance between the circle center of the first upper cover heat insulation piece and the circle center of the upper cover top cover plate is 200 mm;
wherein the accessory device further comprises:
the device comprises an upper cover supporting rod, an upper cover top cover plate, a thermocouple fixing piece, a furnace body supporting rod, a first knob and a second knob; the diameter of the upper cover top cover plate is 400 mm, the thickness of the upper cover top cover plate is 40 mm, the center of the circle is hollowed out, the diameter of the hollowed-out area is 160 mm, and the upper cover top cover plate is matched with the clamping groove at the top of the furnace cover; the upper cover supporting rod is divided into an upper section and a lower section, the diameter of the upper section is 20 mm, the height of the upper section is 120 mm, the diameter of the lower section is 15 mm, and the height of the lower section is 30 mm; the upper cover supporting rods are three in number, the upper part of the upper cover supporting rods are in contact with the lower surface of the upper cover top cover plate, and the lower part of the upper cover supporting rods passes through the upper cover heating plate openings to be in contact with the upper end enclosure of the furnace body; the thermocouple fixing piece is arranged below the lower-layer heat insulation plate;
one end of the first thermocouple is fixed on the lower surface of the lower heat insulation plate through the thermocouple fixing piece, the other end of the first thermocouple penetrates through the large round hole of the sinking area of the lower heat insulation plate, the central round hole of the lower heating plate is tightly attached to the central position of the bottom of the furnace body after the central round hole of the bottom of the heat insulation cotton; and holes with the diameter of 20 mm are formed in the centers of the bottoms of the heat preservation cotton at the centers of the lower heating plates.
2. A self-igniting tube furnace as claimed in claim 1, wherein: the first knob and the second knob are arranged above the upper cover top cover plate.
3. A self-igniting tube furnace as claimed in claim 1, wherein: the thickness of the heat preservation cotton is 20 mm, and the heat preservation cotton is uniformly covered on the surface of the furnace body.
4. A self-igniting tube furnace as claimed in claim 1, wherein: the furnace body support rods are arranged between the lower heating plate and the lower heat insulation plate, the total included angle between every two of the furnace body support rods is 120 degrees, and the distance between the furnace body support rods and the center of the lower heating plate is 150 millimeters horizontally; the diameter of the furnace body supporting rod is 30 mm, and the height of the furnace body supporting rod is 100 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810162164.2A CN108562607B (en) | 2018-02-27 | 2018-02-27 | Self-ignition tube furnace |
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|---|---|---|---|
| CN201810162164.2A CN108562607B (en) | 2018-02-27 | 2018-02-27 | Self-ignition tube furnace |
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| CN108562607A CN108562607A (en) | 2018-09-21 |
| CN108562607B true CN108562607B (en) | 2023-06-20 |
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