CN212741431U - Energy-saving high-temperature furnace for heat treatment - Google Patents

Abstract

An energy-saving high-temperature furnace for heat treatment comprises a furnace body, a heat-insulating layer, a heating layer, a charging barrel and a frame; the charging barrel is cylindrical and is arranged at the center inside the furnace body, and a charging hole is formed in the center of the upper cover of the charging barrel and is communicated with the material channel; the heating layer is sleeved on the periphery of the charging barrel, the heat preservation layer is sleeved on the periphery of the heating layer, the furnace body is fixedly arranged on the rack, and the heating layer is connected with an external power supply through a connecting piece; the heat-insulating layer is square and sequentially comprises a low-temperature heat-insulating layer, a medium-temperature heat-insulating layer and a high-temperature heat-insulating layer from outside to inside; the heating layer is square and is surrounded by a plurality of graphite heating components. Energy-saving high temperature furnace for thermal treatment, simple structure, joinable production, production efficiency is higher, the operation is dangerous little, the economic nature is higher, more energy-conservation, application prospect is extensive.

Description

Energy-saving high-temperature furnace for heat treatment

Technical Field

The utility model relates to a high temperature furnace technical field, concretely relates to energy-saving high temperature furnace is used in heat treatment.

Background

The heat treatment is a metal hot processing technology for changing the chemical components and structures on the surface or in the material to obtain the required performance by heating, heat preservation and cooling the metal material in a solid state. China is a large energy consumer, and the mechanical manufacturing industry is an important part of the energy consumer. With the continuous development of heavy industries such as parts, mechanical manufacturing and the like, the heat treatment plays an important role in supporting the joy and development of the Chinese mechanical manufacturing industry, and the development of the mechanical manufacturing industry can drive the rapid development of the Chinese heat treatment industry, so that a wide development space is provided for the development of the Chinese heat treatment industry, and the development prospect of the industry is wide.

Wherein, the high temperature furnace is an indispensable device in the heat treatment process, and the quality of the performance of the high temperature furnace is directly related to the quality of the product. At present, common high-temperature heating furnaces include: resistance heating type high temperature furnace, arc heating type high temperature furnace, induction heating type high temperature furnace, gas smelting type furnace, continuous heating furnace. The high-temperature furnace for heat treatment in the current market has a plurality of problems, and firstly, the production efficiency is lower; almost no heat preservation measures are taken, the temperature of the furnace wall is very high, the production process is dangerous, the heat released to the outside through the metal outer wall of the furnace body is large, and the energy waste phenomenon is serious. Therefore, the energy-saving high-temperature furnace for heat treatment is developed, the power consumption is reduced, the operation and maintenance cost is reduced, the safety of the production process is improved, and the energy-saving high-temperature furnace has a strong pushing effect on the heat treatment industry.

Chinese patent application No. CN201620526407.2 discloses a vacuum drying furnace, which comprises a vacuum drying furnace body, wherein a vacuum box is arranged in the vacuum drying furnace body. The vacuum box is in sliding fit with the vacuum drying furnace body, and the sliding direction of the vacuum box is perpendicular to the parallel arrangement direction of the vacuum boxes, so that the problem that the vacuum boxes slide in the vacuum drying furnace is solved, the position of the vacuum box to be maintained can be adjusted, the vacuum box is not designed for heat treatment, and the energy-saving effect is not achieved.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the defects, the utility model aims to provide an energy-saving high-temperature furnace for heat treatment, which has simple structure, can be connected for production, has higher production efficiency, small operation danger, higher economical efficiency, more energy conservation and wide application prospect.

The technical scheme is as follows: an energy-saving high-temperature furnace for heat treatment comprises a furnace body, a heat-insulating layer, a heating layer, a charging barrel and a frame; the charging barrel is cylindrical and is arranged at the center inside the furnace body, and a charging hole is formed in the center of the upper cover of the charging barrel and is communicated with the material channel; the heating layer is sleeved on the periphery of the charging barrel, the heat preservation layer is sleeved on the periphery of the heating layer, the furnace body is fixedly arranged on the rack, and the heating layer is connected with an external power supply through a connecting piece; the heat-insulating layer is square and sequentially comprises a low-temperature heat-insulating layer, a medium-temperature heat-insulating layer and a high-temperature heat-insulating layer from outside to inside; the zone of heating is square and the zone of heating is enclosed by a plurality of graphite heating element, the gap between zone of heating and the feed cylinder is provided with heat conduction insulating layer.

The energy-saving high-temperature furnace for heat treatment adopts the graphite heating component as the heating layer, is a resistance heating mode, can be produced in a connected mode, and has the advantages of higher production efficiency, small operation risk, higher economy and more energy conservation. The graphite heating assembly has the use temperature of 2500 ℃, the heat conductivity coefficient is high, the thermal expansion coefficient is low, the weight is light, the loss is small, and a protective film can be generated on the surface of the graphite electrode after the graphite electrode is electrified, so that the graphite electrode is prevented from being excessively worn and is easy to process. In addition, the heating layer is arranged in a surrounding manner, so that the cost is lower, the production process is safer, the temperature control is better, and the production quality is better compared with a high-temperature furnace for heat treatment.

The feed cylinder is cylindrical, but heat preservation, zone of heating are square, and this is because the columniform zone of heating processing degree of difficulty is bigger, and the precision that the position was confirmed to require when the zone of heating links to each other with external power is bigger.

Because insulation material on the existing market, the material that can normally work more than 1500 ℃ is very expensive, and insulation material more common below 800 ℃, the price is also cheaper, so the utility model discloses a structure that the multilayer was arranged is adopted in the design of heat preservation, the heat preservation structure divide into low temperature heat preservation, medium temperature heat preservation, the three region of high temperature heat preservation, has improved the heat preservation effect, and is more energy-conserving.

Further, in the energy-saving high-temperature furnace for heat treatment, the low-temperature heat-insulating layer is made of aluminum sulfate heat-insulating cotton; the medium-temperature heat-insulating layer is built by alumina bubble bricks; the high-temperature heat-insulating layer is filled with magnesium oxide.

When the temperature in the charging barrel is 1750 ℃, the temperature of the heating layer can reach 2000 ℃, and the high-temperature heat-insulating layer is directly contacted with the heating layer, so the high-temperature heat-insulating layer can continuously and normally work at 2000 ℃, the melting point of magnesium oxide is 2820 ℃, the heat conductivity is less than 10 w/m.k, a good heat insulation effect can be achieved, and the price is low; the temperature of the inner wall surface of the medium-temperature heat-insulating layer is reduced to 1500 ℃ through the cooling of the high-temperature heat-insulating layer, the medium-temperature heat-insulating material can continuously and normally work at 1500 ℃, the alumina hollow ball brick can keep better integrity below 1800 ℃, the service life is longer, the density in the refractory brick is lower, the weight of the furnace can be reduced, the heat-insulating effect is good, the stability is good, and the space between the brick and the furnace body can just contain magnesium oxide powder after being stacked; the aluminum acid heat-insulating cotton has stable and reliable quality, good crack resistance, light weight and good heat-insulating performance, is very suitable for filling gaps of a furnace body, can quickly change the temperature within the range of 40-1000 ℃, can not crack or fall off, does not burn, is an excellent heat-insulating material, and has low price. Through the cooling of the three insulating layers, the temperature of the outer wall surface is not more than 70 ℃ finally, and the safe temperature for operation is achieved.

Further, in the energy-saving high-temperature furnace for heat treatment, the graphite heating assembly is of a detachable structure, and the graphite heating assembly consists of three graphite assemblies with completely identical appearances, a graphite piece connected with the positive electrode of the power supply and a graphite piece connected with the negative electrode of the power supply; the graphite assembly, the graphite piece connected with the positive pole of the power supply and the graphite piece connected with the negative pole of the power supply are connected through graphite screws.

This kind of structural design is in order to reduce the processing degree of difficulty, has reduced graphite heating element's processing cost to convenient dismantlement and installation, but five piece separately-packed of split into in the transportation, the reliability of transportation is higher, and contact is inseparable between each subassembly, and contact resistance is very little, and whole graphite heating element resistance distribution is more even, makes the power distribution that generates heat also very even, and the furnace body is inside can not lead to local high temperature because of the heating is inhomogeneous.

Further, in the energy-saving high-temperature furnace for heat treatment, the charging barrel is a graphite charging barrel.

Further, the connecting piece of the energy-saving high-temperature furnace for heat treatment comprises a graphite rod, a copper electrode sleeve and graphite powder; one end of the graphite rod is in threaded connection with the graphite heating assembly, and the other end of the graphite rod penetrates through the heat-insulating layer and the furnace body; the graphite rod extends out of the furnace wall of the furnace body and is inserted into a copper electrode sleeve, and the copper electrode sleeve is connected with an external power supply through a lead; the copper electrode sleeve is sleeved in the copper electrode sleeve, and graphite powder is filled between the graphite rod and the copper electrode sleeve.

Furthermore, according to the energy-saving high-temperature furnace for heat treatment, the silica gel gasket is arranged on the outer side of the furnace wall of the furnace body, and the graphite rod extends out of the furnace wall of the furnace body and then penetrates through the silica gel gasket.

Further, in the energy-saving high-temperature furnace for heat treatment, the copper electrode sleeve is provided with the water-cooling coil.

Because the connecting piece is directly connected with the graphite heating assembly, the graphite heating assembly is expected to maintain the high temperature of 2000 ℃ in the heating process, and parts directly connected with the graphite heating assembly are required to be made of graphite materials, so that the graphite rod is selected, has small cross section area, large length and large thermal resistance, and can reduce the temperature of the part of the graphite rod extending out of the furnace body. Since the graphite rod extending to the outside is still in a high-temperature state, and the graphite at 600 ℃ is oxidized when exposed to the air, the water-cooling coil is arranged on the copper electrode sleeve, and the temperature of the connecting piece is reduced by circulating cooling water. Simultaneously, because the bending force that the graphite rod can bear can not be very big, otherwise easy fracture, consequently must have better fixed knot to construct, copper electrode cover passes through flange joint with the copper electrode sleeve, and the copper electrode sleeve also passes through flange joint with the oven, sets up the silica gel gasket between the copper electrode cover leads to and the oven so that insulating installation, makes long and thin graphite rod atress simultaneously, can not appear graphite linkage part because the atress fracture appears too greatly. In addition, graphite powder with high conductivity is filled between the graphite rod extending out of the furnace body and the copper electrode sleeve, the copper electrode sleeve is connected with an external power supply through a lead, the connection of the three parts is very tight, and the contact thermal resistance is very small, so that the heat productivity is small.

Further, the energy-saving high-temperature furnace for heat treatment further comprises a temperature measuring mechanism, wherein the temperature measuring mechanism comprises a first temperature measuring part, a second temperature measuring part, a third temperature measuring part, a fourth temperature measuring part and a fifth temperature measuring part; the temperature measuring part is inserted into the inner side of the joint of the high-temperature heat preservation layer and the heating layer, the temperature measuring part is inserted into the inner side of the joint of the high-temperature heat preservation layer and the medium-temperature heat preservation layer, the temperature measuring part is inserted into the inner side of the joint of the medium-temperature heat preservation layer and the low-temperature heat preservation layer, the temperature measuring part is inserted into the inner side of the joint of the low-temperature heat preservation layer and the inner wall of the furnace body, and the temperature measuring part is inserted into the position near the.

Furthermore, in the energy-saving high-temperature furnace for heat treatment, the first temperature measuring part and the fifth temperature measuring part are platinum rhodium thermocouples, and the second temperature measuring part, the third temperature measuring part and the fourth temperature measuring part are K-type thermocouples.

The temperatures of the first temperature measuring part and the fifth temperature measuring part are estimated to be between 1300 ℃ and 1800 ℃, so that the temperatures of the platinum-rhodium thermocouple, the second temperature measuring part, the third temperature measuring part and the fourth temperature measuring part are estimated to be lower than 1300 ℃, and a K-type thermocouple is used.

The utility model has the advantages that: the energy-saving high-temperature furnace for heat treatment adopts the graphite heating component as the heating layer, is a resistance heating mode, can be connected for production, has higher production efficiency, small operation danger, higher economy and more energy conservation; the heating layer is arranged in a surrounding mode, so that compared with a high-temperature furnace for heat treatment, the cost is lower, the production process is safer, the temperature control is better, and the production quality is better; the design of heat preservation adopts the structure of multilayer arrangement, the heat preservation structure divide into low temperature heat preservation, medium temperature heat preservation, high temperature heat preservation three region, has improved the heat preservation effect, and is more energy-conserving, and application prospect is extensive.

Drawings

FIG. 1 is a sectional view of an energy-saving high-temperature furnace for heat treatment according to the present invention;

FIG. 2 is a top view of the energy-saving high-temperature furnace for heat treatment according to the present invention;

FIG. 3 is a schematic structural view of a graphite heating assembly of the energy-saving high-temperature furnace for heat treatment according to the present invention;

FIG. 4 is a schematic view of the connecting member structure of the energy-saving high-temperature furnace for heat treatment according to the present invention;

in the figure: furnace body 1, heat preservation 2, low temperature heat preservation 21, medium temperature heat preservation 22, high temperature heat preservation 23, zone of heating 3, graphite heating element 31, graphite subassembly 311, the anodal graphite spare 312 of connection power, the graphite spare 313 of connection power negative pole, feed cylinder 4, feed hole 41, frame 5, material passageway 6, connecting piece 7, graphite rod 71, copper electrode sleeve 72, copper electrode cover 73, graphite powder 74, silica gel gasket 75, water-cooling coil 76, heat conduction insulating layer 8, temperature measurement mechanism 9, temperature measurement spare 91, No. two temperature measurement spare 92, No. three temperature measurement spare 93, No. four temperature measurement spare 94, No. five temperature measurement spare 95.

Detailed Description

The present invention will be further elucidated with reference to the accompanying drawings 1 to 4 and the specific embodiments.

The energy-saving high-temperature furnace for heat treatment with the structure shown in fig. 1 and 2 comprises a furnace body 1, a heat-insulating layer 2, a heating layer 3, a charging barrel 4 and a frame 5; the charging barrel 4 is cylindrical and is arranged at the center inside the furnace body 1, and a material hole 41 is formed in the center of an upper cover of the charging barrel 4 and is communicated with the material channel 6; the heating layer 3 is sleeved on the periphery of the charging barrel 4, the heat preservation layer 2 is sleeved on the periphery of the heating layer 3, the furnace body 1 is fixedly arranged on the rack 5, and the heating layer 3 is connected with an external power supply through a connecting piece 7; the heat-insulating layer 2 is square, and the heat-insulating layer 2 sequentially comprises a low-temperature heat-insulating layer 21, a medium-temperature heat-insulating layer 22 and a high-temperature heat-insulating layer 23 from outside to inside; the zone of heating 3 is square and the zone of heating 3 is enclosed by a plurality of graphite heating element 31, the gap between zone of heating 3 and feed cylinder 4 is provided with heat conduction insulating layer 8.

In addition, the low-temperature heat-insulating layer 21 is aluminum acid heat-insulating cotton; the medium-temperature heat-insulating layer 22 is formed by stacking alumina bubble bricks; the high-temperature insulating layer 23 is filled with magnesium oxide.

In addition, the graphite heating component 31 is a detachable structure, and the graphite heating component 31 consists of three graphite components 311 with completely identical shapes, a graphite piece 312 connected with the positive electrode of the power supply and a graphite piece 313 connected with the negative electrode of the power supply; the graphite components 311, the graphite piece 312 connected with the positive pole of the power supply and the graphite piece 313 connected with the negative pole of the power supply are connected through graphite screws.

Further, the cartridge 4 is a graphite cartridge.

Further, the connecting piece 7 comprises a graphite rod 71, a copper electrode sleeve 72, a copper electrode sleeve 73 and graphite powder 74; one end of the graphite rod 71 is in threaded connection with the graphite heating component 31, and the other end of the graphite rod penetrates through the heat-insulating layer 2 and the furnace body 1; the graphite rod 71 extends out of the furnace wall of the furnace body 1 and is inserted into the copper electrode sleeve 73, and the copper electrode sleeve 73 is connected with an external power supply through a lead; the copper electrode sleeve 73 is sleeved in the copper electrode sleeve 72, and graphite powder 74 is filled between the graphite rod 71 and the copper electrode sleeve 73.

In addition, a silica gel gasket 75 is arranged on the outer side of the furnace wall of the furnace body 1, and the graphite rod 71 extends out of the furnace wall of the furnace body 1 and then penetrates through the silica gel gasket 75.

Further, a water-cooling coil 76 is arranged on the copper electrode sleeve 73.

Further, the temperature measuring device comprises a temperature measuring mechanism 9, wherein the temperature measuring mechanism 9 comprises a first temperature measuring part 91, a second temperature measuring part 92, a third temperature measuring part 93, a fourth temperature measuring part 94 and a fifth temperature measuring part 95; no. one temperature measurement piece 91 inserts the inboard of high temperature heat preservation 23 and 3 junctions of zone of heating, No. two temperature measurement pieces 92 insert the inboard of high temperature heat preservation 23 and the inboard of middle temperature heat preservation 22 junction, No. three temperature measurement pieces 93 insert the inboard of middle temperature heat preservation 22 and low temperature heat preservation 21 junction, No. four temperature measurement pieces 94 insert the inboard of low temperature heat preservation 21 and the 1 inner wall junction of stove body, No. five temperature measurement pieces 95 insert near connecting piece 7 of high temperature heat preservation 23 department.

Further, the first temperature measuring part 91 and the fifth temperature measuring part 95 are platinum rhodium thermocouples, and the second temperature measuring part 92, the third temperature measuring part 93 and the fourth temperature measuring part 94 are K-type thermocouples.

Examples

Based on the above structure, as shown in FIGS. 1 to 4.

Energy-saving high temperature furnace for thermal treatment, make the frame 5 of steel construction outside furnace body 1 in order to fix, support, cover the center on feed cylinder 4 and seted up material hole 41, through the 6 pay-offs of material passageway on screw feeder follow material hole 41. Wherein, between material passageway 6 and the screw feeder export, between material passageway 6 and material hole 41, all connect through flange nut.

Then, the heating layer 3 adopts the graphite heating component 31, is a resistance heating mode, can be connected for production, and has the advantages of higher production efficiency, small operation risk, higher economical efficiency and more energy conservation. The graphite heating component 31 has the use temperature of 2500 ℃, the heat conductivity coefficient is high, the thermal expansion coefficient is low, the weight is light, the loss is small, and a protective film can be generated on the surface of the graphite electrode after the graphite electrode is electrified, so that the graphite electrode is prevented from being excessively worn and is easy to process.

The graphite heating component 31 is a detachable structure and consists of three graphite components 311 with the same shape, a graphite piece 312 connected with the positive pole of the power supply and a graphite piece 313 connected with the negative pole of the power supply; the graphite components 311, the graphite piece 312 connected with the positive electrode of the power supply and the graphite piece 313 connected with the negative electrode of the power supply are connected through graphite screws.

This kind of structural design is in order to reduce the processing degree of difficulty, has reduced graphite heating element's processing cost to convenient dismantlement and installation, but five piece separately-packed of split into in the transportation, the reliability of transportation is higher, and contact is inseparable between each subassembly, and contact resistance is very little, and whole graphite heating element resistance distribution is more even, makes the power distribution that generates heat also very even, and the furnace body is inside can not lead to local high temperature because of the heating is inhomogeneous.

In addition, the heating layer 3 is arranged in a surrounding manner, so that compared with a traditional high-temperature furnace, the cost is lower, the outer production process is safer, the temperature control is better, and the production quality is also better.

Further, since the connecting member 7 is directly connected to the graphite heating element 31, and the graphite heating element 31 is expected to maintain a high temperature of 2000 ℃ during heating, the member directly connected to the graphite heating element 31 must be made of graphite material, so that the graphite rod 71 is selected to have a small cross-sectional area, a large length, and a large thermal resistance, thereby reducing the temperature of the portion of the graphite rod 71 extending out of the furnace body. Since the graphite rod 71 extending to the outside is still in a high temperature state, and the graphite at 600 ℃ is oxidized when exposed to the air, the copper electrode sheath 73 is provided with the water cooling coil 76, and the temperature of the connecting piece is reduced by circulating cooling water. Meanwhile, the graphite rod 71 cannot bear large bending force, otherwise the graphite rod is easy to break, so that a better fixing structure is needed, the copper electrode sleeve 73 is connected with the copper electrode sleeve 72 through a flange, the copper electrode sleeve 72 is connected with the furnace wall through a flange, a silica gel gasket 75 is arranged between the copper electrode sleeve 72 and the furnace wall for insulation installation, meanwhile, the long and thin graphite rod 71 is not stressed, and the graphite connecting part cannot break due to overlarge stress. In addition, graphite powder 74 with high conductivity is filled between the graphite rod 71 extending out of the furnace body and the copper electrode sleeve 73, the copper electrode sleeve 73 is connected with an external power supply through a lead, the connection of the three parts is very tight, and the contact thermal resistance is very small, so that the generated heat is small.

Further, because insulation material on the existing market, the material that can normally work more than 1500 ℃ is very expensive, and insulation material more common below 800 ℃, the price is also cheaper, so the utility model discloses a structure that the multilayer was arranged is adopted in the design of heat preservation 2, the heat preservation structure divide into low temperature heat preservation 21, medium temperature heat preservation 22, the three region of high temperature heat preservation 23, has improved the heat preservation effect, and is more energy-conserving. When the temperature is 1750 ℃, the temperature of the heating layer 3 can reach 2000 ℃, and the high-temperature heat-insulating layer 23 is directly contacted with the heating layer 3, so the high-temperature heat-insulating layer 23 can continuously and normally work at 2000 ℃, the melting point of the magnesium oxide is 2820 ℃, the heat conductivity is less than 10 w/m.k, a good heat insulation effect can be achieved, and the price is low; the temperature of the inner wall surface of the medium-temperature heat-insulating layer 22 is reduced to 1500 ℃ through the cooling of the high-temperature heat-insulating layer 23, the medium-temperature heat-insulating material can continuously and normally work at 1500 ℃, the alumina hollow ball brick can keep better integrity below 1800 ℃, the service time is longer, the density in the refractory brick is lower, the weight of the furnace can be reduced, the heat-insulating effect is good, the stability is good, and the space between the brick and the furnace body 1 can just contain magnesium oxide powder after being stacked; the low-temperature heat-insulating layer 21 can normally work at 800 ℃ due to the cooling of the medium-temperature heat-insulating layer 22, the aluminum acid heat-insulating cotton is stable and reliable in quality, good in crack resistance, light in weight, good in heat-insulating property, very suitable for filling gaps of a furnace body, and free of cracking, falling and burning due to the fact that the temperature is rapidly changed within the range of 40-1000 ℃, and the heat-insulating layer 2 is an excellent heat-insulating material and low in price. The temperature of the outer wall surface is not more than 70 ℃ finally by cooling the three insulating layers 2, so that the safe temperature for operation is achieved.

Furthermore, in order to improve the safety in the using process, the temperature of each position in the high-temperature furnace body needs to be monitored, and then the temperature is fed back to the display in real time through the first temperature measuring piece 91, the second temperature measuring piece 92, the third temperature measuring piece 93, the fourth temperature measuring piece 94 and the fifth temperature measuring piece 95. The temperatures of the first temperature measuring piece 91 and the fifth temperature measuring piece 95 are estimated to be between 1300 ℃ and 1800 ℃, so that the temperatures of the platinum-rhodium thermocouple, the second temperature measuring piece 92, the third temperature measuring piece 93 and the fourth temperature measuring piece 94 are estimated to be lower than 1300 ℃, and a K-type thermocouple can be used.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.

In addition, the embodiments of the present invention can be arbitrarily combined with each other, and the same shall be regarded as the disclosure of the present invention as long as the idea of the present invention is not violated.

Claims (9)

1. An energy-saving high-temperature furnace for heat treatment is characterized by comprising a furnace body (1), a heat-insulating layer (2), a heating layer (3), a charging barrel (4) and a frame (5); the charging barrel (4) is cylindrical and is arranged at the center inside the furnace body (1), and a material hole (41) is formed in the center of an upper cover of the charging barrel (4) and is communicated with the material channel (6); the heating layer (3) is sleeved on the periphery of the charging barrel (4), the heat preservation layer (2) is sleeved on the periphery of the heating layer (3), the furnace body (1) is fixedly arranged on the rack (5), and the heating layer (3) is connected with an external power supply through a connecting piece (7); the heat-insulating layer (2) is square, and the heat-insulating layer (2) sequentially comprises a low-temperature heat-insulating layer (21), a medium-temperature heat-insulating layer (22) and a high-temperature heat-insulating layer (23) from outside to inside; the heating layer (3) is square, the heating layer (3) is surrounded by a plurality of graphite heating components (31), and a heat conduction insulating layer (8) is arranged in a gap between the heating layer (3) and the charging barrel (4).

2. The energy-saving high-temperature furnace for heat treatment as claimed in claim 1, wherein the low-temperature heat-insulating layer (21) is aluminum heat-insulating cotton; the medium-temperature heat-insulating layer (22) is built by alumina bubble bricks; the high-temperature heat-insulating layer (23) is filled with magnesium oxide.

3. The energy-saving high-temperature furnace for heat treatment according to claim 1, wherein the graphite heating assembly (31) is a detachable structure, and the graphite heating assembly (31) comprises three graphite assemblies (311) with completely identical shapes, a graphite piece (312) connected with a positive electrode of a power supply and a graphite piece (313) connected with a negative electrode of the power supply; the graphite components (311), the graphite piece (312) connected with the positive pole of the power supply and the graphite piece (313) connected with the negative pole of the power supply are connected through graphite screws.

4. The energy-saving high-temperature furnace for heat treatment according to claim 1, wherein the charging barrel (4) is a graphite charging barrel.

5. The energy-saving high-temperature furnace for heat treatment according to claim 1, wherein the connecting piece (7) comprises a graphite rod (71), a copper electrode sleeve (72), a copper electrode sleeve (73), and graphite powder (74); one end of the graphite rod (71) is in threaded connection with the graphite heating assembly (31), and the other end of the graphite rod penetrates through the heat-insulating layer (2) and the furnace body (1); the graphite rod (71) extends out of the furnace wall of the furnace body (1) and is inserted into the copper electrode sleeve (73), and the copper electrode sleeve (73) is connected with an external power supply through a lead; the copper electrode sleeve (73) is sleeved in the copper electrode sleeve (72), and graphite powder (74) is filled between the graphite rod (71) and the copper electrode sleeve (73).

6. The energy-saving high-temperature furnace for heat treatment according to claim 5, wherein a silica gel gasket (75) is arranged outside the furnace wall of the furnace body (1), and the graphite rod (71) extends out of the furnace wall of the furnace body (1) and then penetrates through the silica gel gasket (75).

7. The energy-saving high-temperature furnace for heat treatment according to claim 6, wherein a water-cooling coil (76) is arranged on the copper electrode sleeve (73).

8. The energy-saving high-temperature furnace for heat treatment according to claim 1, further comprising a temperature measuring mechanism (9), wherein the temperature measuring mechanism (9) comprises a first temperature measuring part (91), a second temperature measuring part (92), a third temperature measuring part (93), a fourth temperature measuring part (94) and a fifth temperature measuring part (95); the utility model discloses a temperature measurement spare (91) is inserted the inboard of high temperature heat preservation (23) and zone of heating (3) junction, No. two temperature measurement spare (92) insert the inboard of high temperature heat preservation (23) and middle temperature heat preservation (22) junction, No. three temperature measurement spare (93) insert the inboard of middle temperature heat preservation (22) and low temperature heat preservation (21) junction, No. four temperature measurement spare (94) insert the inboard of low temperature heat preservation (21) and stove body (1) inner wall junction, No. five temperature measurement spare (95) insert near connecting piece (7) of high temperature heat preservation (23) department.

9. The energy-saving high-temperature furnace for heat treatment according to claim 8, wherein the first temperature measuring piece (91) and the fifth temperature measuring piece (95) are platinum-rhodium thermocouples, and the second temperature measuring piece (92), the third temperature measuring piece (93) and the fourth temperature measuring piece (94) are K-type thermocouples.

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