Two-section type belt type roasting machine
By dividing the belt roaster into two stages: low temperature and high temperature, the high temperature resistance requirements of the trolley are reduced, and the problem of high investment costs of existing belt roasters is solved, and cost savings and processing capacity are achieved.
Patent Information
- Application Number
- CN202323435635.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-15
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2033-12-15
AI Technical Summary
The investment and construction cost of existing belt roasters is relatively high, mainly because the trolley needs to use high-temperature resistant alloy steel throughout the process, and the base and edge materials need to be laid to protect the trolley.
The two-stage belt roaster is used to divide the process into a low-temperature belt roaster unit and a high-temperature belt roaster unit. The low-temperature unit middle trolley does not require high-grade high-temperature resistant alloy steel and bottom and edge laying materials.
It reduces the investment and construction cost of pellet mine technology, improves unit processing capacity, saves investment, and increases adaptability to raw materials.
Smart Images
Figure CN222460206U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of roasting machines, in particular to a two-stage belt roasting machine. Background Art
[0002] The existing belt roasting machine mainly includes a furnace cover, a bellows, a trolley, a head wheel, a tail wheel, an upper track, a lower track, and a fan.
[0003] The process section of a belt roaster refers to the drying, preheating, roasting, soaking and cooling processes that need to be completed in sequence when pellets are produced in the belt roaster. Therefore, the belt roaster is divided into process sections according to different functions. The existing technology usually divides the belt roaster into seven process sections: blast drying section, exhaust drying section, preheating section, roasting section, soaking section, first cooling section and second cooling section. The process sections are connected by circulating air.
[0004] The process fans of the belt roaster mainly include cooling fans, heat recovery fans, main exhaust fans, blower fans, and blower exhaust fans. These process fans are used to realize the process control of the circulation of the air system and the balance of air volume during the pellet production process. These fans are set under the track.
[0005] In the existing belt roasting machine process, the belt roasting machine process uses a belt roasting machine equipment to complete all the processes of drying, preheating, roasting and cooling of pellets. When the pellets are produced in the belt roasting machine, the materials are relatively static, and the materials are moved between the process sections through the circulation of the trolley. Since the highest gas temperature in the roasting section is as high as 1300℃, the material of the trolley in the whole process has to be made of special alloy steel with excellent high temperature resistance, and the bottom and side materials are laid on the trolley to protect the long-term safe operation of the trolley. As a result, the investment and construction cost of the belt roasting machine process is relatively high.
[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content
[0007] The utility model aims to provide a two-stage belt roasting machine, which improves the unit processing capacity of the belt roasting machine and further saves investment by making it unnecessary to use high-grade high-temperature resistant alloy steel for part of the trolley and unnecessary to lay bottom and side materials.
[0008] To achieve the above-mentioned purpose, the utility model provides a two-stage belt roasting machine. The two-stage belt roasting machine is used to process pellets. The two-stage belt roasting machine includes: a low-temperature belt roasting machine unit and a high-temperature belt roasting machine unit that are separately arranged, and a material conveying unit that conveys the pellets from the low-temperature belt roasting machine unit to the high-temperature belt roasting machine unit. The material conveying unit is arranged outside the low-temperature belt roasting machine unit and the high-temperature belt roasting machine unit.
[0009] Further, the low temperature belt roasting machine unit comprises a first furnace cover, a first conveying unit and a first wind box; the first conveying unit passes through the first furnace cover. The high temperature belt roasting machine unit comprises a second furnace cover, a second conveying unit and a second wind box; the second conveying unit passes through the second furnace cover. The material conveying unit is arranged outside the first furnace cover and the second furnace cover.
[0010] Further, the first furnace cover includes a blast drying section furnace cover, an exhaust drying section furnace cover, and a first preheating section furnace cover through which the pellets pass in sequence. The blast drying section furnace cover, the exhaust drying section furnace cover, and the first preheating section furnace cover correspond to the blast drying section, the exhaust drying section, and the first preheating section, respectively.
[0011] Further, the second furnace cover includes a second preheating section furnace cover, a roasting section furnace cover, a soaking section furnace cover, a first cooling section furnace cover, a second cooling section furnace cover and a third cooling section furnace cover through which the pellets pass in sequence. The second preheating section furnace cover, the roasting section furnace cover, the soaking section furnace cover, the first cooling section furnace cover, the second cooling section furnace cover and the third cooling section furnace cover correspond to the second preheating section, the roasting section, the soaking section, the first cooling section, the second cooling section and the third cooling section respectively.
[0012] Further, the material conveying unit is a material guide chute.
[0013] Furthermore, the first transport unit includes a first trolley, a head wheel, a tail wheel, an upper track and a lower track; the second transport unit includes a second trolley, a head wheel, a tail wheel, an upper track and a lower track. The first trolley is arranged on the upper track and the lower track, the head wheel is a driving wheel, the head wheel drives the first trolley to move on the track, and the tail wheel is a driven wheel; the second trolley is arranged on the upper track and the lower track, the head wheel is a driving wheel, the head wheel drives the second trolley to move on the track, and the tail wheel is a driven wheel.
[0014] Furthermore, the first vehicle is not provided with bottom and side materials, while the second vehicle is provided with bottom and side materials.
[0015] Further, the high temperature resistance of the first vehicle is lower than the high temperature resistance of the second vehicle.
[0016] Furthermore, the two-stage belt roasting machine also includes an air duct and the following fans: a drying exhaust fan, a first main exhaust fan, a drying fan, a second main exhaust fan, a heat recovery fan, and a cooling fan. The first wind box includes a drying section wind box, an exhaust drying section wind box, and a first preheating section wind box corresponding to the drying section furnace cover, the exhaust drying section furnace cover, and the first preheating section furnace cover, respectively; the second wind box includes a second preheating section wind box, a baking section wind box, an exhaust section wind box, a first cooling section wind box, a second cooling section wind box, and a third cooling section wind box corresponding to the second preheating section furnace cover, the baking section furnace cover, the soaking section furnace cover, the first cooling section furnace cover, the second cooling section furnace cover, and the third cooling section furnace cover, respectively. The blast drying section furnace hood is connected to the blast drying exhaust fan through an air duct; the blast drying section bellows and the third cooling section furnace hood are connected to the blast drying fan through an air duct; the exhaust drying section furnace hood and the rear section of the roasting section bellows and the equalizing section bellows are connected to the heat recovery fan through an air duct; the exhaust drying section bellows and the first preheating section bellows are also connected to the first main exhaust fan through an air duct; the first preheating section furnace hood is connected to the second cooling section furnace hood through an air duct; the second preheating section bellows and the front section of the roasting section bellows are connected to the second main exhaust fan through an air duct; the first cooling section furnace hood, the second cooling section furnace hood and the third cooling section furnace hood are connected to the cooling fan through an air duct.
[0017] Furthermore, the air duct also includes a secondary air main pipe and a downcomer.
[0018] Compared with the prior art, the technical effects of the utility model are:
[0019] (1) By dividing the belt roaster into two sections, the investment and construction cost of the pelletizing process is reduced. Since the temperature required for drying and preliminary preheating of the pellets is low, the trolley of the low-temperature belt roaster does not need to use high-grade high-temperature resistant alloy steel, so the cost is greatly reduced compared to the current belt roaster.
[0020] (2) Since the drying preheating and roasting cooling of the pellets are completed in two devices respectively, when the properties of the raw materials change, the speeds of the two belt roasters can be coordinated and controlled according to actual production needs, thereby adjusting the reaction time of the pellets in a certain process section. Compared with the single speed of the current belt roaster process, an important control method is added, which improves the adaptability of the process to the raw materials.
[0021] (3) Since the working temperature inside the low-temperature belt roaster is low, the trolley does not need to be protected by bottom and side materials. Therefore, compared with the existing belt roaster, the pellet output per unit time of the low-temperature belt roaster can be increased.
[0022] (4) The utility model is particularly suitable for large-scale pelletizing projects. When the required belt roasting machine is too long, the process proposed by the utility model can be used to divide the belt roasting machine into two sections, which is convenient for design and implementation and can save project investment. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A conventional belt roaster is schematically shown;
[0024] Figure 2 A two-stage belt roasting machine according to an embodiment of the present invention is schematically shown.
[0025] Description of main reference numerals:
[0026] 1-blast drying section furnace hood; 2-exhaust drying section furnace hood; 3-first preheating section furnace hood; 4-second preheating section furnace hood; 5-roasting section furnace hood; 6-heating section furnace hood; 7-first cooling section furnace hood; 8-second cooling section furnace hood; 9-third cooling section furnace hood; 10-secondary air main; 11-down pipe; 12-material conveying unit; 13-blast drying exhaust fan; 14-first main exhaust fan; 15-blast drying fan; 16-second main exhaust fan; 17-reheat fan; 18-cooling fan; 19-trolley; 20-furnace hood; 100-low-temperature belt roasting machine unit; 101-first furnace hood; 102-first transport unit; 103-first wind box; 200-high-temperature belt roasting machine unit; 201-second furnace hood; 202-second transport unit; 203-second wind box. DETAILED DESCRIPTION
[0027] The specific implementation modes of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.
[0028] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.
[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0030] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.
[0032] The present invention is further described below with reference to the accompanying drawings and embodiments. In terms of working principle, the segmented belt roaster of the present invention is similar to the existing belt roaster. According to different functions and the time sequence of the processes that the briquette ore passes through in the segmented belt roaster, the segmented belt roaster is divided into the following process sections: blast drying section, exhaust drying section, preheating section, roasting section, soaking section, first cooling section and second cooling section. Figure 1 shown. Figure 1 In the process, each process section is carried out in the corresponding furnace cover part. The furnace cover 20 includes the furnace cover of the blast drying section, the furnace cover of the exhaust drying section, the furnace cover of the preheating section, the furnace cover of the roasting section, the furnace cover of the soaking section, the furnace cover of the first cooling section and the furnace cover of the second cooling section. Each process section is connected through an air circulation system. The cooling fan blows the ambient air into the first cooling section and the second cooling section. After heat exchange with the pellets, the hot air of the second cooling section is supplied to the blast drying section through the blast drying fan to preliminarily dry the green balls. The exhaust gas of the blast drying section is discharged into the atmosphere after dust removal. The hot air from the first cooling section is supplied to the equalizing section, roasting section, and preheating section for preheating, roasting process and homogenization of the pelletized ore. The hot exhaust gas from the equalizing section and the post-roasting section is collected as reheated air and returned to the belt roasting machine system through the reheating fan. Most of it enters the exhaust drying section furnace cover as the medium for exhaust drying, and the rest enters the preheating section as needed. The hot exhaust gas from the exhaust drying section, preheating section and the pre-roasting section is collected under the action of the main exhaust fan, and after being collected, it is discharged into the atmosphere after being treated with dust removal, desulfurization and denitrification.
[0033] According to the two-stage belt roasting machine of the utility model, the following process sections are carried out: blast drying section, exhaust drying section, first preheating section, second preheating section, roasting section, soaking section, first cooling section, second cooling section and third cooling section. According to the working temperature, the process section of the two-stage belt roasting machine of one embodiment of the utility model is divided into two parts: low-temperature belt roasting machine process section and high-temperature belt roasting machine process section. The low-temperature belt roasting machine process section includes blast drying section, exhaust drying section and first preheating section. The high-temperature belt roasting machine process section includes second preheating section, roasting section, soaking section, first cooling section, second cooling section and third cooling section. The hot air of the blast drying section comes from the third cooling section, and the hot air of the third cooling section is introduced into the blast drying section through the blast drying fan 15 to dry the pellets. The dried exhaust gas is discharged into the atmosphere after dust removal under the action of the blast drying fan 13. The hot air in the exhaust drying section comes from the reheated air generated in the rear section of the roasting section and the equalizing section. The reheated air is introduced into the exhaust drying section through the heat recovery fan 17. The dried exhaust gas enters the dust removal and desulfurization and denitrification links under the action of the first main exhaust fan 14. The hot air in the first preheating section comes from the second cooling section. The exhaust gas after the preheating of the pellets enters the dust removal and desulfurization and denitrification links under the action of the first main exhaust fan 14. The hot air in the second preheating section, roasting section and equalizing section all comes from the first cooling section. After entering the secondary air main pipe 10, the hot air enters the second preheating section and roasting section through the downcomer 11. The downcomers 11 are symmetrically distributed on both sides of the secondary air main pipe 10. At the same time, the second preheating section and roasting section are provided with burners to provide heat sources for the preheating and roasting of the pellets.
[0034] like Figure 2 As shown, the two-stage belt roaster according to the utility model comprises: a low-temperature belt roaster unit 100 and a high-temperature belt roaster unit 200 which are separately arranged, and a material conveying unit 12 for conveying the pellets from the low-temperature belt roaster unit 100 to the high-temperature belt roaster unit 200. The pellets first complete the drying and preliminary preheating process in the low-temperature belt roaster unit 100, and then enter the high-temperature belt roaster unit 200 through the material conveying unit 12, and complete the preheating, roasting, soaking and cooling processes in the high-temperature belt roaster in sequence.
[0035] Preferably, the low temperature belt roaster unit 100 includes a first furnace cover 101, a first transport unit 102 and a wind box 103. Preferably, the first furnace cover 101 includes a blast drying section furnace cover 1, an exhaust drying section furnace cover 2, and a first preheating section furnace cover 3 through which the pellets pass in sequence. The blast drying section furnace cover 1, the exhaust drying section furnace cover 2, and the first preheating section furnace cover 3 correspond to the blast drying section, the exhaust drying section, and the first preheating section, respectively. A first trolley (not shown). Similarly, the first wind box 103 includes a blast drying section wind box, an exhaust drying section wind box, and a first preheating section wind box corresponding to the blast drying section furnace cover 1, the exhaust drying section furnace cover 2, and the first preheating section furnace cover 3, respectively. The first transport unit 102 runs through the first furnace cover 101. Preferably, the first transport unit 102 includes a first trolley (not shown), a head wheel, a tail wheel, an upper track, and a lower track. The first trolley is arranged on the upper track and the lower track. For the configuration of the transport unit and the trolley 19, see Figure 1 The first car is arranged on the upper track and the lower track, the head wheel is the driving wheel, the head wheel drives the first car to move on the track, and the tail wheel is the driven wheel.
[0036] Preferably, the high temperature belt roasting machine unit 200 includes a second furnace cover 201, a second conveying unit 202 and a wind box 203. A second trolley (not shown). The second trolley is arranged on the second conveying unit 202, and the second conveying unit 202 runs through the second furnace cover 201. Preferably, the second furnace cover 201 includes a second preheating section furnace cover 4, a roasting section furnace cover 5, a soaking section furnace cover 6, a first cooling section furnace cover 7, a second cooling section furnace cover 8 and a third cooling section furnace cover 9, through which the pellets pass in sequence. The second preheating section furnace cover 4, the roasting section furnace cover 5, the soaking section furnace cover 6, the first cooling section furnace cover 7, the second cooling section furnace cover 8 and the third cooling section furnace cover 9 correspond to the second preheating section, the roasting section, the soaking section, the first cooling section, the second cooling section and the third cooling section, respectively. Similarly, the second wind box 203 includes a second preheating section wind box, a roasting section wind box, a soaking section wind box, a first cooling section wind box, a second cooling section wind box and a third cooling section wind box corresponding to the second preheating section furnace hood 4, the roasting section furnace hood 5, the soaking section furnace hood 6, the first cooling section furnace hood 7, the second cooling section furnace hood 8 and the third cooling section furnace hood 9 respectively. The second transport unit 202 runs through the first furnace hood 201. Preferably, the second transport unit 202 includes a second trolley (not shown), a head wheel, a tail wheel, an upper track and a lower track. The second trolley is arranged on the upper track and the lower track. For the arrangement of the transport unit and the trolley 19, please refer to Figure 1 The second trolley is arranged on the upper track and the lower track, the head wheel is the driving wheel, the head wheel drives the second trolley to move on the track, and the tail wheel is the driven wheel.
[0037] Compared with the high-temperature belt roasting machine unit 200, the low-temperature belt roasting machine unit 100 has a lower operating temperature, so the first car is different from the second car. The first car does not need to use high-grade high-temperature resistant alloy steel, so the high temperature resistance of the first car is lower than that of the second car. In addition, the first car does not need to be provided with bottom and side materials, while the second car needs to be provided with bottom and side materials because the operating temperature is higher than the low-temperature belt roasting machine unit 100.
[0038] The material conveying unit 12 is disposed outside the first furnace hood 101 and the second furnace hood 201. Preferably, the material conveying unit 12 is a material guiding chute.
[0039] The two-stage belt roasting machine according to the embodiment of the utility model further includes an air duct and the following fans: a blower exhaust fan 13, a first main exhaust fan 14, a blower fan 15, a second main exhaust fan 16, a heat recovery fan 17, and a cooling fan 18. The air duct is used to connect the fans and the furnace hoods of each section in the following manner. Preferably, the air duct further includes a secondary air main pipe 10 and a downcomer 11.
[0040] Preferably, the blast drying section furnace hood is connected to the blast drying exhaust fan through an air duct; the blast drying section bellows and the third cooling section furnace hood are connected to the blast drying fan through an air duct; the exhaust drying section furnace hood and the rear section of the roasting section bellows and the equalizing section bellows are connected to the heat recovery fan through an air duct; the exhaust drying section bellows and the first preheating section bellows are also connected to the first main exhaust fan through an air duct; the first preheating section furnace hood is connected to the second cooling section furnace hood through an air duct; the second preheating section bellows and the front section of the roasting section bellows are connected to the second main exhaust fan through an air duct; the first cooling section furnace hood, the second cooling section furnace hood and the third cooling section furnace hood are connected to the cooling fan through an air duct, so that the cooling fan 18 blows ambient air into the first cooling section furnace hood 7, the second cooling section furnace hood 8 and the third cooling section furnace hood 9.
[0041] During actual production of the segmented belt roasting machine according to the present embodiment, the cooling fan 18 blows ambient air into the first cooling section, the second cooling section and the third cooling section. After heat exchange with the pellets, a part of the hot air from the first cooling section directly enters the equalizing section, and the other part is merged into the secondary air main 10, and is evenly supplied to the roasting section and the second preheating section through the downcomer 11 for preheating and roasting of the pellets. At the same time, heat is supplied by the burner to control the temperature in the furnace within the set range; the hot air from the second cooling section is supplied to the first preheating section for preliminary preheating of the pellets; the hot air from the third cooling section is supplied to the blast drying section under the action of the dryer fan 15 for preliminary drying of the pellets; the exhaust gas generated in the rear section of the roasting section and the equalizing section is used as reheated air, and is supplied to the exhaust drying section under the action of the reheating fan 17.
[0042] The waste gas generated in the blast drying section is discharged from the furnace cover by the action of the blast drying exhaust fan 13, and is discharged into the atmosphere after dust removal; the waste gas generated in the exhaust drying section and the first preheating section enters the dust removal and desulfurization and denitrification links by the action of the first main exhaust fan 14; the waste gas generated in the second preheating section and the front section of the roasting section enters the dust removal and desulfurization and denitrification links by the action of the second main exhaust fan 16.
[0043] According to the segmented belt roasting machine process of the utility model, the belt roasting machine is divided into two sections. Since the drying and preheating working temperatures in the low-temperature belt roasting machine unit 100 are low, the trolley does not need to use high-grade high-temperature resistant alloy steel, thereby reducing investment costs. At the same time, the low-temperature belt roasting machine unit 100 does not need to lay bottom and side materials, thereby improving the unit processing capacity of the equipment, reducing the specifications of the roasting machine, and further saving investment.
[0044] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
[0045] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.
Claims
1. A two-stage belt roaster, which is used to process pellets; characterized in that: The two-stage belt roaster comprises: a low-temperature belt roaster unit (100) and a high-temperature belt roaster unit (200) which are separately arranged, and a material conveying unit (12) for conveying pellets from the low-temperature belt roaster unit (100) to the high-temperature belt roaster unit (200); The material conveying unit (12) is arranged outside the low-temperature belt roasting machine unit (100) and the high-temperature belt roasting machine unit (200); The low-temperature belt roasting machine unit (100) comprises a first furnace cover (101), a first transport unit (102) and a first wind box (103); the first transport unit (102) passes through the first furnace cover (101); The first transport unit (102) comprises a first vehicle, a head wheel, a tail wheel, an upper track and a lower track; the second transport unit (202) comprises a second vehicle, a head wheel, a tail wheel, an upper track and a lower track. Among them, the first car is arranged on the upper track and the lower track, the head wheel is the driving wheel, the head wheel drives the first car to move on the track, and the tail wheel is the driven wheel; the second car is arranged on the upper track and the lower track, the head wheel is the driving wheel, the head wheel drives the second car to move on the track, and the tail wheel is the driven wheel.
2. The two-stage belt roasting machine according to claim 1, characterized in that: The high-temperature belt roasting machine unit (200) comprises a second furnace cover (201), a second transport unit (202) and a second wind box (203); the second transport unit (202) passes through the second furnace cover (201); The material conveying unit (12) is arranged outside the first furnace hood (101) and the second furnace hood (201).
3. The two-stage belt roasting machine according to claim 2, characterized in that: The first furnace cover (101) comprises a blast drying section furnace cover (1), an exhaust drying section furnace cover (2), and a first preheating section furnace cover (3), through which the pellets pass in sequence; The forced air drying section furnace hood (1), the exhaust air drying section furnace hood (2), and the first preheating section furnace hood (3) correspond to the forced air drying section, the exhaust air drying section, and the first preheating section, respectively.
4. The two-stage belt roasting machine according to claim 2, characterized in that: The second furnace hood (201) comprises a second preheating section furnace hood (4), a roasting section furnace hood (5), a soaking section furnace hood (6), a first cooling section furnace hood (7), a second cooling section furnace hood (8) and a third cooling section furnace hood (9), through which the pellets pass in sequence; The second preheating section furnace hood (4), the roasting section furnace hood (5), the soaking section furnace hood (6), the first cooling section furnace hood (7), the second cooling section furnace hood (8) and the third cooling section furnace hood (9) correspond to the second preheating section, the roasting section, the soaking section, the first cooling section, the second cooling section and the third cooling section, respectively.
5. The two-stage belt roasting machine according to claim 1, characterized in that: The material conveying unit (12) is a material guide chute.
6. The two-stage belt roasting machine according to claim 1, characterized in that: The first car is not provided with bottom and side materials, while the second car is provided with bottom and side materials.
7. The two-stage belt roaster according to claim 1, characterized in that: The high temperature resistance of the first car is lower than that of the second car.
8. The two-stage belt roaster according to claim 1, characterized in that: The two-stage belt roasting machine also includes an air duct and the following fans: a drying exhaust fan (13), a first main exhaust fan (14), a drying fan (15), a second main exhaust fan (16), a heat recovery fan (17), and a cooling fan (18); The first wind box (103) comprises a blast drying section wind box, an exhaust drying section wind box and a first preheating section wind box corresponding to the blast drying section furnace hood (1), the exhaust drying section furnace hood (2) and the first preheating section furnace hood (3), respectively; the second wind box (203) comprises a second preheating section wind box, a calcining section wind box, an exhaust drying section wind box, a first cooling section wind box, a second cooling section wind box and a third cooling section wind box corresponding to the second preheating section furnace hood (4), the calcining section furnace hood (5), the soaking section furnace hood (6), the first cooling section furnace hood (7), the second cooling section furnace hood (8) and the third cooling section furnace hood (9), respectively. The blast drying section furnace hood (1) is connected to the blast drying exhaust fan (13) through an air duct; the blast drying section wind box and the third cooling section furnace hood (9) are connected to the blast drying fan (15) through an air duct; the exhaust drying section furnace hood (2) is connected to the rear section of the roasting section wind box and the equalizing section wind box through an air duct and the heat recovery fan (17); the exhaust drying section wind box and the first preheating section wind box are also connected to the first main exhaust fan (14) through an air duct; the first preheating section furnace hood (3) is connected to the second cooling section furnace hood (8) through an air duct; the second preheating section wind box and the front section of the roasting section wind box are connected to the second main exhaust fan (16) through an air duct; the first cooling section furnace hood (7), the second cooling section furnace hood (8) and the third cooling section furnace hood (9) are connected to the cooling fan (18) through an air duct.