CN100591778C - Heated air circulation bake oven - Google Patents
Heated air circulation bake oven Download PDFInfo
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- CN100591778C CN100591778C CN200710045717A CN200710045717A CN100591778C CN 100591778 C CN100591778 C CN 100591778C CN 200710045717 A CN200710045717 A CN 200710045717A CN 200710045717 A CN200710045717 A CN 200710045717A CN 100591778 C CN100591778 C CN 100591778C
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Abstract
The present invention relates to a hot air circulating dry oven, which belongs to a periodical electric cooker and comprises a stainless square pipe and an electric cooker main body welded by steel plates. The furnace casing is divided into an inner layer and an outer layer, and an insulation layer is arranged between the two layers; a hot air circulating system, a charging basket rotating systemand a fast cooling system are arranged on the electric cooker main body. The hot air circulating system comprises a hot air circulating blower arranged at the top part of the electric cooker main body, a fan connected with the hot air circulating blower, two heaters arranged at both sides of the fan and an air guiding system composed of air deflectors at the top and both sides of each heater. Thecharging basket rotating system comprises at least one group of traversing slewing machine which can perform separate slewing heating for at least one charging basket; the fast cooling system comprises an air blower and a draught fan connected with the air guiding system. The present invention aims at resolving the problems of the uneven material changing and the great local temperature variationduring the material clotting, tempering and annealing process, improves the production efficiency, reduces the production and operation cost, and resolves the problem of evenness of the furnace temperature for the structure.
Description
Technical Field
The invention relates to heat treatment equipment for sintering, tempering, annealing and the like of materials, in particular to a hot air circulation oven.
Background
With the progress of science and technology and the development of times, the technological requirements of people on material heat treatment are continuously improved, and further, more definite requirements are provided for the temperature deviation in the effective heating area of the electric furnace for material heat treatment.
In order to enable each part of the heated materials (particularly large or multiple materials) to meet the uniform heat treatment requirement, reduce the performance deviation among materials and further improve the internal quality of products, the requirement on the deviation range (furnace temperature uniformity) of the temperature in an effective heating zone is smaller and smaller.
In the design of an air guide cover of the existing hot air circulation oven, relative positions of a used blind plate and an air guide plate with an air guide hole are fixed and invariable, the blind plate and the air guide plate cannot be randomly combined according to the position of a heated workpiece in the oven, and a rapid cooling device and a charging basket rotating system are lacked, so that the uniformity of the oven temperature of the hot air circulation oven can only be controlled within the range of the highest or lowest temperature deviation of +/-5 ℃, and the heat treatment requirement of a user on a high-precision product can not be met. Therefore, the appearance of the corresponding products as early as possible is urgently expected by the industry.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a hot air circulation oven, solves the problems of uneven material change, large local temperature difference and the like of materials generated in the heat treatment process of sintering, tempering, annealing and the like of the materials, improves the production efficiency, reduces the production operation cost, and structurally and completely solves the problem of uniformity of the furnace temperature.
The purpose of the invention is realized as follows:
a hot air circulation oven belongs to a periodic operation electric furnace and comprises an electric furnace main body
The body is formed by welding stainless steel square tubes and steel plates and comprises a furnace shell, a furnace door, a door frame and a bracket arranged on the back of the furnace shell;
the furnace shell is divided into an inner layer and an outer layer, and a heat preservation layer is arranged between the two layers of furnace shells;
the electric furnace main body is respectively provided with a hot air circulating system, a charging bucket rotating system and a rapid cooling system;
the hot air circulating system comprises a hot air circulating fan arranged at the top of the electric furnace main body, a fan connected with the hot air circulating fan, heaters arranged on two sides of the fan, and an air guide system arranged on the electric furnace main body;
the charging basket rotating system comprises a rotating mechanism which can independently rotate and heat the charging basket in the hearth;
the rapid cooling system comprises a blower and an induced draft fan which are arranged at the top of the electric furnace main body and communicated with the air guide system;
it is characterized in that the preparation method is characterized in that,
the air guide system comprises an air guide cover arranged in the electric furnace main body, and the air guide cover comprises air guide plates arranged at the top and the left and right sides of a hearth of the electric furnace main body;
the space formed by the top air deflector of the hearth of the electric furnace main body, the air deflectors on the left side and the right side and the inner furnace shell forms a circulating air duct of the electric furnace main body.
The air deflectors on the left side and the right side are formed by combining a detachable blind plate arranged up and down and a perforated plate on which air guide holes are uniformly distributed.
In the above hot air circulation oven, wherein,
the furnace shell heat-insulating layer is filled with refractory fiber heat-insulating materials, and the thickness of the heat-insulating layer is determined according to the rated temperature required by the heat treatment process and the heat loss of the oven.
And the furnace door and the door frame of the electric furnace main body are respectively provided with an inner layer sealing device and an outer layer sealing device.
The three rotary mechanisms are longitudinally arranged in parallel at intervals up and down along the interior of the electric furnace main body and can independently perform rotary heating on the three charging barrels in the electric furnace respectively.
The slewing mechanism comprises two horizontally rotating rolling shafts which are arranged in parallel in the electric furnace; the two rolling shafts are driven by the same speed reducer arranged on the bracket at the back of the electric furnace main body and are driven to rotate by a chain wheel and a chain, so that the charging barrels arranged on the two rolling shafts rotate axially.
The two ends of the rolling shaft are respectively supported by rolling bearings, the rear end of the rolling shaft is a fixed end, the front end of the rolling shaft is a movable end which can expand and extend freely when being heated, and a supporting wheel arranged in the hearth supports the front end and the rear end of the rolling shaft.
The rolling bearings supported at two ends of the rolling shaft are respectively a front end bearing arranged in the hearth and a rear end bearing arranged on a bracket at the back of the electric furnace main body; wherein, the front end bearing is a high temperature resistant bearing.
And a rotary sealing device is arranged at the joint of the rolling shaft and the bracket at the back of the electric furnace main body.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1. the invention utilizes the combination of the wind scooper (forcing cold wind or hot wind to flow according to the design requirement direction), the centrifugal or axial flow heat circulating fan and the heating element to calculate, and finally determines the optimal wind volume, wind pressure and power distribution of the whole machine.
The temperature uniformity in the whole effective heating space is good after the heated air circulation oven is heated and subjected to heat balance treatment in a heating state. In the thermal equilibrium state, a temperature difference of 3 ℃ is finally reached between the highest point and the lowest point relative to the control temperature in the effective heating zone.
In addition, the hot air circulation oven also realizes that the uniformity of the oven temperature is controlled within 10 ℃ in the dynamic processes of heating and temperature rising and cooling after heating in the working process.
2. In the design of the air guide cover, the blind plate and the air guide plate with the air guide hole can be combined randomly according to the position of the heated workpiece in the oven, so that the optimal heating effect and temperature uniformity can be obtained.
The air blower and the induced draft fan which are additionally arranged in the device and communicated with the air guide system meet the process requirement that the rapid cooling is needed after the heating is finished in the heat treatment process.
3. In the design of the oven, the charging basket rotating system is added, and the heated workpieces can circularly rotate in the heating area, so that the heated workpieces in the charging basket are heated more uniformly.
In conclusion, the invention not only adapts to the use characteristics of the current new material, ensures that the material crystal grains of the heated workpiece are not enlarged, and the performance of each part of the workpiece has almost no difference, but also meets the heat treatment requirement of the novel material of aerospace and military products.
Drawings
The objects, specific structural features and advantages of the present invention will be further understood from the following description of the embodiments taken in conjunction with the accompanying drawings. Wherein, the attached drawings are as follows:
FIG. 1 is a schematic front structural view of a heated air circulation oven according to the present invention;
FIG. 2 is a left side view of the structure of FIG. 1;
FIG. 3 is a schematic top view of the structure of FIG. 1;
FIG. 4 is a schematic front view of the side wind deflector of FIG. 1;
FIG. 5 is a left side view of the structure of FIG. 4;
FIG. 6 is a schematic top view of the bucket rotation system;
FIG. 7 is a rear view of the structure of FIG. 6;
fig. 8 is a right-view structural diagram of fig. 6.
Detailed Description
Referring to fig. 1, 2 and 3 and fig. 4-8 in a matching way, the hot air circulation oven belongs to an electric furnace for periodic operation. The electric furnace mainly comprises an electric furnace main body, wherein the electric furnace main body is formed by welding stainless steel square tubes and steel plates and comprises a furnace shell 15, a furnace door 10, a door frame and a bracket 64 arranged on the back surface of the furnace shell; the furnace shell 15 is divided into an inner layer and an outer layer, a heat insulation layer 13 is arranged between the two layers of furnace shells, the heat insulation layer 13 is filled with refractory fiber heat insulation materials, and the thickness of the heat insulation layer is determined according to the rated temperature required by heat treatment and the heat loss of the oven.
The electric furnace main body is respectively provided with a hot air circulating system, a charging basket rotating system and a rapid cooling system; wherein,
the hot air circulating system comprises a hot air circulating fan 3 arranged at the top of the electric furnace main body, a fan connected with the hot air circulating fan 3 into a whole, heaters 14 arranged at two sides of the fan, and an air guide system arranged on the electric furnace main body;
the air guide system comprises an air guide cover arranged in the electric furnace main body, and the air guide cover comprises air guide plates 4 and 5 arranged at the top and the left and right sides of the electric furnace main body;
the space formed by the combination of the top air deflector 4, the left and right air deflectors 5 and the inner furnace shell of the electric furnace main body forms a circulating air duct of the electric furnace main body. The air deflectors 5 on the left and right sides are composed of a detachable blind plate 51 arranged up and down and a perforated plate 52 with air guiding holes uniformly distributed thereon.
As shown in fig. 6, 7 and 8, the charging basket rotating system of the present invention includes a rotating mechanism 6 capable of independently rotating and heating the charging basket 8 in the hearth. In this embodiment, three rotating mechanisms 6 are used, and are arranged in parallel at intervals in the longitudinal direction of the hearth of the electric furnace main body, so that three charging barrels 8 in the electric furnace can be independently heated in a rotating manner.
The charging basket slewing mechanism 6 comprises two horizontally rotating rolling shafts 68 which are arranged in parallel in the electric furnace; the two rolling shafts 68 are driven by the same speed reducer 61 arranged on the electric furnace main body back support 64, the speed reducer 61 is arranged on the mounting plate 65, and the two rolling shafts 68 are driven to rotate by the chain wheels including a driving chain wheel 611, a driven chain wheel 69 and a chain 610, so that the charging barrel 8 arranged on the two rolling shafts 68 rotates axially.
The two ends of the rolling shaft 68 are respectively supported by rolling bearings, the rear end is a fixed end, the front end is a movable end which can expand and extend freely when being heated, and the front end and the rear end are supported by a supporting wheel 66 arranged in the hearth.
One of the rolling bearings supported at both ends of the rolling shaft 68 is a front end bearing 612 arranged in the hearth, and the other is a rear end bearing 63 arranged on the back support 64 of the electric furnace main body; the front end bearing 612 is a high temperature resistant bearing.
The joint of the rolling shaft 68 and the back bracket of the electric furnace main body is provided with a rotary sealing device 67, and the furnace door 10 of the electric furnace main body and the door frame thereof are respectively provided with an inner sealing device 11 and an outer sealing device 12, which can effectively reduce the heat loss in the furnace chamber.
The rapid cooling system comprises a blower 1 and a draught fan 2 which are arranged at the top of an electric furnace main body and communicated with an air guide system. As shown in the drawing, in the present embodiment, the blower 1 and the induced draft fan 2 are respectively provided on the left and right sides of the heat cycle fan 3.
The invention utilizes the combination of the wind scooper (forcing cold wind or hot wind to flow according to the design requirement direction), the centrifugal or axial flow thermal circulation fan 3 and the heating element to calculate, and finally determines the optimal wind volume, wind pressure and power distribution of the whole machine. Finally, the temperature reaches an effective heating area in a thermal equilibrium state, and the temperature difference between the highest point and the lowest point relative to the control temperature is within 3 ℃.
The invention also realizes that the uniformity of the furnace temperature can be controlled within 10 ℃ in the dynamic process of heating and temperature rise and cooling after heating. In the design of the wind scooper, the blind plate 51 and the wind deflector 52 with the wind guiding holes can be combined arbitrarily according to the position of the heated workpiece in the oven, so as to achieve the optimal heating effect and temperature uniformity.
And in the cooling process, the process requirement of rapid cooling after the heating of the heat treatment process is finished is met by utilizing the air blower 1 and the induced draft fan 2 which are arranged in the cooling system and communicated with the air guide system.
In the design of the electric furnace main body, the charging basket rotating system is added, so that the heated workpieces can circularly rotate in the heating area, and each heated workpiece in the charging basket 8 is heated more uniformly.
As shown in fig. 4 and 5, in the air guiding system of the present embodiment, the air guiding plate at the side of the hearth of the electric furnace main body is assembled by 10 detachable opening plates 52 and blind plates 51, corresponding fasteners 53 and fixing plates 54, and forms a three-dimensional air guiding cover together with the top air guiding plate 4 of the hearth. The wind scooper and the thermal cycle fan 3 together constitute the wind guide system of the present invention. In the process of heat treatment, the relative positions of the perforated plate 52 and the blind plate 51 can be flexibly changed according to different charging conditions, so that hot air in the hearth of the electric furnace main body can circulate according to a preset flow track as shown by an arrow in figure 1, and good furnace temperature uniformity is obtained.
Utilize air-blower 1 and draught fan 2 and corresponding valve of setting at electric stove main part top, when the heating finishes the cooling, if cooling rate is still not enough, can in time discharge the hot-air in the oven through draught fan 2, send into cold air through forcing in the furnace of air-blower 1 to the electric stove main part simultaneously to reach the required quick cooling effect of production technology, improve production efficiency.
A reinforced structure made of stainless steel tubes or bent plates is added to all the bearing parts in the main structure of the electric furnace so as to achieve sufficient bearing capacity. Four adjusting support legs 9 capable of adjusting the electric furnace to be horizontal are arranged at the lower part of the electric furnace main body, so that the flatness of four corners of the electric furnace main body and the ground can be flexibly adjusted.
The oven control cabinet 7 in fig. 1 adopts a touch screen and a PLC to jointly control the motors of all the electrical devices on the oven, including the heater 14, the thermal cycle fan 3, the induced draft fan 2, the blower 1, the charging basket rotating mechanism 6, and the like, and related electrical components, and operates according to a preset process.
Claims (3)
1. A hot air circulating oven belongs to a periodic operation electric furnace, which comprises an electric furnace main body,
the electric furnace main body is formed by welding stainless steel square tubes and steel plates and comprises a furnace shell, a furnace door, a door frame and a bracket arranged on the back of the furnace shell;
the furnace shell is divided into an inner layer and an outer layer, and a heat preservation layer is arranged between the two layers of furnace shells;
the electric furnace main body is respectively provided with a hot air circulating system, a charging bucket rotating system and a rapid cooling system;
the hot air circulating system comprises a hot air circulating fan arranged at the top of the electric furnace main body, a fan connected with the hot air circulating fan into a whole, heaters arranged at two sides of the fan, and an air guide system arranged on the electric furnace main body;
the charging basket rotating system comprises a rotating mechanism which can independently rotate and heat the charging basket in the hearth;
the rapid cooling system comprises a blower and an induced draft fan which are arranged at the top of the electric furnace main body and communicated with the air guide system;
it is characterized in that the preparation method is characterized in that,
the air guide system comprises an air guide cover arranged in the electric furnace main body, and the air guide cover comprises air guide plates arranged at the top and the left and right sides of a hearth of the electric furnace main body;
the top air deflector of the hearth of the electric furnace main body, and the spaces formed between the air deflectors on the left side and the right side and the inner furnace shell form a circulating air duct of the electric furnace main body;
the air deflectors on the left side and the right side are formed by combining a detachable blind plate arranged up and down and a perforated plate on which air guide holes are uniformly distributed.
2. The hot air circulation oven according to claim 1, wherein the number of the rotary mechanisms is three, and the three rotary mechanisms are arranged in parallel at intervals up and down along the longitudinal direction of the interior of the electric furnace main body and can respectively and independently perform rotary heating on three charging barrels in the electric furnace;
the slewing mechanism comprises two horizontally rotating rolling shafts which are arranged in parallel in the electric furnace; the two rolling shafts are driven by the same speed reducer arranged on the bracket at the back of the electric furnace main body and are driven to rotate by a chain wheel and a chain, so that the charging barrels arranged on the two rolling shafts rotate axially.
3. The hot air circulation oven according to claim 2, wherein two ends of the rolling shaft are respectively supported by rolling bearings, the rear end of the rolling shaft is a fixed end, the front end of the rolling shaft is a movable end which can freely expand and extend when heated, and a riding wheel supporting support arranged in the hearth is arranged between the front end and the rear end;
the rolling bearings supported at two ends of the rolling shaft are respectively a front end bearing arranged in the hearth and a rear end bearing arranged on a bracket at the back of the electric furnace main body; wherein, the front end bearing is a high temperature resistant bearing;
and a rotary sealing device is arranged at the joint of the rolling shaft and the bracket at the back of the electric furnace main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710045717A CN100591778C (en) | 2007-09-07 | 2007-09-07 | Heated air circulation bake oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710045717A CN100591778C (en) | 2007-09-07 | 2007-09-07 | Heated air circulation bake oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101118113A CN101118113A (en) | 2008-02-06 |
| CN100591778C true CN100591778C (en) | 2010-02-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710045717A Expired - Fee Related CN100591778C (en) | 2007-09-07 | 2007-09-07 | Heated air circulation bake oven |
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| Country | Link |
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| CN (1) | CN100591778C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410731A (en) * | 2011-12-19 | 2012-04-11 | 青岛赛瑞达设备制造有限公司 | Hot air circulation system and heating and cooling furnace |
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| CN101749929A (en) * | 2010-01-20 | 2010-06-23 | 常州亿晶光电科技有限公司 | Special baking oven for silicon material |
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| CN101118113A (en) | 2008-02-06 |
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