Fine powder drying device

Abstract

The utility model relates to the field of ironmaking and steelmaking ingredient drying, and particularly discloses a fine powder drying device. In order to solve the problems of ingredient fluctuation, sintering quality reduction and the like caused by poor fine powder moisture control in the prior art, the device comprises a drying host unit, a powder conveying line is arranged in an outer cover, the head end of the conveying line is located below a powder inlet in the top of the outer cover, a powder heating unit is arranged below the head end of the conveying line, a powder discharging port is formed in the bottom of the other side of the outer cover, and an air draft unit is arranged at the top of the outer cover. Two vibration isolation spring bases are installed at the bottom of the outer cover, a plurality of air inlets are formed in the lower portion of the side wall, and fine powder is received by a receiving trolley after being discharged. Through cooperative work of the inclination angle of the conveying line, the eccentric wheel driving vibration, the air draft unit and the heating unit, the problems that fine powder is uneven in drying, low in efficiency and prone to caking are effectively solved, and the production efficiency and the product quality are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the drying of ingredients in the process of ironmaking and steelmaking, and particularly relates to a fine powder drying device. Background Art

[0002] The whole ironmaking production process is a process of reducing a large amount of iron ore and iron-containing raw materials into liquid pig iron. Most of the iron ore is artificial rich ore, including pellet ore and sinter ore. Among the large amount of fine powder used in the sintering process, due to the excessive moisture content of the fine powder, it is easy to form lumps and stick to the ore bin, which will affect the accuracy of batching and the uniformity of the mixture, and ultimately lead to a "flower face" on the cross-section of the sintering machine tail, reducing the quality of sintered ore production.

[0003] Moreover, the moisture fluctuation of the raw materials will cause the fluctuation of batching. Since the batching is charged according to 100% wet materials and calculated according to dry materials, the moisture content of various raw materials is assumed to be constant. If the moisture content of the raw materials fluctuates, it will inevitably cause the fluctuation of batching. Therefore, the control of fine powder moisture plays an important role in the air permeability of the mixed material layer of the physical and chemical mixture, accelerating the vertical sintering speed and improving the sintering production quality.

[0004] The existing fine powder drying equipment for material transportation and drying has uneven drying, low drying efficiency, and the fine powder is easy to agglomerate, which cannot meet the production requirements of sintered ore and seriously affects the production efficiency and product quality. Summary of the Invention

[0005] The utility model aims at the defects existing in the prior art and provides a fine powder drying device.

[0006] To achieve the above object, the utility model adopts the following technical scheme, including a drying host unit; the drying host unit includes an outer cover, a powder inlet is arranged at the top of one side of the outer cover, a powder conveying line is arranged inside the outer cover, and the head end of the powder conveying line is located below the powder inlet.

[0007] A heating unit for heating the powder is arranged inside the outer cover below the powder conveying line.

[0008] A powder discharge port is arranged at the bottom of the other side of the outer cover, and the powder discharge port is located below the end of the powder conveying line.

[0009] An air extraction unit for extracting the moisture of the fine powder is further arranged at the top of the outer cover.

[0010] Further, two vibration isolation spring bases are arranged at the bottom of the outer cover.

[0011] Further, a plurality of air inlets are arranged at the lower part of the side wall of the outer cover.

[0012] Further, after the fine powder is discharged from the powder discharge port, it is received and transported by a receiving vehicle.

[0013] Further, the air extraction unit includes a main pipe arranged horizontally, and a plurality of vertical branch pipes connected to the main pipe. The branch pipes are respectively perpendicular to the main pipe, and the top of the branch pipe is connected to the bottom of the main pipe; both ends of the main pipe are blocked, and the middle of the main pipe is connected to a fan for air extraction; an air suction inlet is arranged at the bottom of the branch pipe, and a through hole communicating with the air suction inlet is arranged at the top of the outer cover. The air suction inlet covers the corresponding through hole and is connected to the outer cover.

[0014] Furthermore, the air suction inlet adopts a flared air suction port.

[0015] Furthermore, a filter screen is arranged at the air suction inlet.

[0016] Further, the heating unit adopts a tubular gas heater. The tubular gas heater includes a horizontal gas passage pipe, and a plurality of flame nozzles are arranged on the gas passage pipe. A gas inlet pipe is arranged at the bottom of the gas passage pipe, and the top of the gas inlet pipe is connected to the gas passage pipe; and the gas inlet pipe, the gas passage pipe, and the flame nozzles are all located inside the outer cover and below the powder conveying line; and the bottom of the gas inlet pipe passes through the side wall of the outer cover and is connected to a gas source.

[0017] Further, the powder conveying line includes a conveying line body. The conveying line body is inclined, and the head end of the conveying line body is high and the tail end is low; and a support one is arranged at the bottom of the head end of the conveying line body. The support one is hinged to the support three, and a support bottom plate is arranged at the bottom of the support three and is fixed to the inner wall of the outer cover through the support bottom plate;

[0018] A support two is arranged at the bottom of the tail end of the conveying line body. The top of the support two is fixedly connected to the bottom of the conveying line body. The bottom of the support two is hinged to one end of a swing shaft through a pin shaft one, and the other end of the swing shaft is rotationally connected to an eccentric shaft structure;

[0019] The eccentric shaft structure includes two symmetrically arranged eccentric shafts, and the two eccentric shafts are the same in size and shape and share the same center; a driving shaft extending outward is arranged at the outer center of each of the two eccentric shafts, and a journal is arranged between the two eccentric shafts, and the journal is located at a non - center position;

[0020] The other end of the swing shaft is sleeved outside the journal and is rotationally connected to the journal.

[0021] After the driving shaft passes through the through hole on the side wall of the outer cover, one of the driving shafts is driven to rotate by a driving motor.

[0022] Furthermore, the base of the driving motor is installed on the outer wall of the outer cover, and the motor shaft of the driving motor is connected to the driving shaft to drive the driving shaft to rotate.

[0023] Furthermore, a baffle is provided on each of the left and right sides of the conveyor line body.

[0024] Furthermore, convex material platforms are arranged at intervals on the conveyor belt of the conveyor line body.

[0025] The beneficial effects of the present utility model compared with the prior art.

[0026] The present utility model adopts a conveyor line with a certain inclination angle, which is beneficial to the conveyance of materials and can improve production efficiency. At the same time, when drying the fine powder, an eccentric wheel structure is used to drive the conveyor line to vibrate, realizing the high-frequency vibration of the materials, which is beneficial to the pulverization and ventilation of the powder materials. While improving the drying efficiency, it also prevents the fine powder from caking. Meanwhile, when the fan is started, the fan sucks air from the inside of the drying host unit through the main pipe and 4 branch pipes, and quickly discharges the moisture during the drying process of the fine powder to the outside. It solves the problems of uneven drying, low drying efficiency and easy caking of the fine powder.

[0027] The present utility model also has a convex material platform structure arranged at intervals on the conveyor line, which plays roles such as loosening the powder materials and improving air permeability, and is beneficial to the ventilation effect during the material conveyance process, and can further improve the drying efficiency. Description of the Drawings

[0028] The following further describes the present utility model in conjunction with the drawings and specific embodiments. The protection scope of the present utility model is not limited only to the description of the following content.

[0029] Figure 1 is the front view of a fine powder drying device;

[0030] Figure 2 is the partial sectional front view of a fine powder drying device;

[0031] Figure 3 is the front view of a fine powder drying device with the baffle removed from the conveyor line;

[0032] Figure 4 is the three-dimensional view of the conveyor line of a fine powder drying device Figure 1 ;

[0033] Figure 5 is the three-dimensional view of the conveyor line of a fine powder drying device Figure 2 ;

[0034] Figure 6 is the schematic diagram of the drive shaft of a fine powder drying device.

[0035] In the figure, 1 is the drying host unit, 2 is the air extraction unit, 3 is the heating unit, and 4 is the receiving cart;

[0036] 101 is the powder inlet, 102 is the outer cover, 103 is the discharge port, 104 is the air inlet, 105 is the vibration isolation spring base, 106 is the conveyor line body, 107 is the first support, 108 is the rotating shaft, 109 is the third support, 110 is the support base, 111 is the convex material platform, 112 is the second support, 113 is the swing shaft, 114 is the first pin shaft, 115 is the eccentric shaft, 116 is the drive shaft, 117 is the journal, 118 is the drive motor, 119 is the baffle;

[0037] 201 is the air suction inlet, 202 is the branch pipe, 203 is the main pipe, 204 is the fan, 205 is the air outlet, 206 is the filter screen;

[0038] 301 is the gas inlet, 302 is the flame nozzle. Specific implementation manner

[0039] To better understand the technical solution of the present utility model, the following specific implementation schemes are provided; and the following schemes are only for illustration.

[0040] As Figures 1-6 shown, the embodiment: includes a drying host unit 1; the drying host unit 1 includes an outer cover 102, a powder inlet 101 is arranged at the top of one side of the outer cover 102, a powder conveyor line is arranged inside the outer cover 102, and the head end of the powder conveyor line is located below the powder inlet 101; below the powder conveyor line and inside the outer cover 102, a heating unit 3 for heating the powder is arranged; a powder discharge port 103 is arranged at the bottom of the other side of the outer cover 102, and the powder discharge port 103 is located below the end of the powder conveyor line; a suction unit 2 (or called an exhaust unit) for extracting the moisture of the fine powder is also arranged at the top of the outer cover 102. After the fine powder is discharged from the powder discharge port 103, it is received and transported by a receiving vehicle 4.

[0041] Preferably, two vibration isolation spring bases 105 are arranged at the bottom of the outer cover 102. That is, an air spring shock absorber or a damping spring vibration isolator. An optional implementation scheme is: the vibration isolation spring base 105 can be composed of a spring and a guide seat. Among them, the function of the spring is to absorb vibration energy and reduce vibration transmission. The guide seat includes upper and lower parts. The top of the spring is connected to the upper part of the guide seat, and the bottom of the spring is connected to the lower part of the guide seat.

[0042] Preferably, the exhaust unit 2 includes a main pipe 203 arranged horizontally, and a plurality of vertical branch pipes 202 connected to the main pipe 203. The branch pipes 202 are respectively perpendicular to the main pipe 203, and the tops of the branch pipes 202 are connected to the bottom of the main pipe 203; both ends of the main pipe 203 are blocked, and the middle of the main pipe 203 is connected to a blower 204 for exhausting air; an air suction inlet 201 is provided at the bottom of the branch pipe 202, and a through hole connected to the air suction inlet 201 is provided at the top of the outer cover 102. The air suction inlet 201 covers the corresponding through hole, and the air suction inlet 201 is connected to the outer cover 102. The air suction inlet 201 adopts a flared air suction opening. A filter screen 206 is provided at the air suction inlet 201. It is used to prevent fine powder materials from being sucked away when extracting moisture.

[0043] Preferably, the heating unit 3 adopts a tubular gas heater. The tubular gas heater includes a horizontal gas channel pipe, and a plurality of flame nozzles 302 are arranged on the gas channel pipe. A gas inlet pipe 301 is provided at the bottom of the gas channel pipe, and the top of the gas inlet pipe 301 is connected to the gas channel pipe; and the gas inlet pipe 301, the gas channel pipe, and the flame nozzles 302 are all located inside the outer cover 102 and below the powder conveying line; and the bottom of the gas inlet pipe 301 passes through the outer cover 102 and is connected to a gas source. A plurality of air inlets 104, or air holes, are provided at the lower part of the side wall of the outer cover 102.

[0044] Preferably, the powder conveying line includes a conveying line body 106, the conveying line body 106 is inclined, and a baffle 119 is provided on each of the left and right sides of the conveying line body 106. Convex material platforms 111 are arranged at intervals on the conveyor belt of the conveying line body 106.

[0045] Moreover, the head end of the conveyor line body 106 is higher and the tail end is lower; a first support 107 is provided at the bottom of the head end of the conveyor line body 106, the first support 107 is hinged to the third support 109 through a rotating shaft 108, a support bottom plate 110 is provided at the bottom of the third support 109, and is fixed to the inner wall of the outer cover 102 through the support bottom plate 110; a second support 112 is provided at the bottom of the tail end of the conveyor line body 106, the top of the second support 112 is fixedly connected to the bottom of the conveyor line body 106, the bottom of the second support 112 is hinged to one end of a swing shaft 113 through a first pin shaft 114, and the other end of the swing shaft 113 is rotationally connected to an eccentric shaft structure; the eccentric shaft structure includes two symmetrically arranged eccentric shafts 115, and the two eccentric shafts 115 are of the same size and shape and are concentric; a driving shaft 116 extending outward is provided at the outer center of each of the two eccentric shafts 115, a journal 117 is provided between the two eccentric shafts 115, and the journal 117 is located at a non-central position; specifically, the two driving shafts 116 are of equal size, and in the area where the two eccentric shafts 115 are connected, the journal 117 is not located in this area and has no intersection with this area; the other end of the swing shaft 113 is sleeved outside the journal 117 and is rotationally connected to the journal 117. (That is, the other end of the swing shaft 113 can rotate relative to the journal 117. After the driving shaft 116 passes through the through hole on the side wall of the outer cover 102, one of the driving shafts 116 is driven to rotate by a driving motor 118. (And the driving shaft 116 can rotate freely relative to the through hole, and the driving shaft 116 can be installed in the through hole through a bearing so that it can rotate freely relative to the through hole.) The base of the driving motor 118 is installed on the outer wall of the outer cover 102, and the motor shaft of the driving motor 118 is connected to the driving shaft 116 to drive the driving shaft 116 to rotate.

[0046] The conveyor line of the present utility model adopts a structure with a certain inclination angle. This ingenious layout aims to make full use of gravity assistance to ensure that materials can smoothly enter the conveying system and quickly start the transmission process, thereby significantly improving the overall efficiency of production operations.

[0047] The present utility model introduces an eccentric wheel drive mechanism. This mechanism causes the conveyor line to generate high-frequency vibrations, effectively stimulating the mutual collision and friction between powder particles and accelerating their crushing process. At the same time, the vibration effect is conducive to the air circulation in the gaps inside and around the powder, enhancing the contact area and exchange rate between the material and hot air, and further optimizing the drying efficiency.

[0048] In order to further strengthen the ventilation effect during the drying process, the conveying system of the present utility model is also specially equipped with a convex material platform structure. The aim is to promote the loose accumulation of materials during the conveying process, increase the ventilation space between particles and between particles and the conveying surface, ensure that the air flow can penetrate deeper into the material layer, and thus improve the overall drying efficiency.

[0049] The specific working process is as follows: 1. Import the refined powder from the powder inlet 101 into the drying device, and the refined powder falls onto the conveying line body 106 (the so-called conveying line body 106 is made of a steel plate).

[0050] 2. Start the drying device.

[0051] 3. Start the fan 204. The fan 204 sucks air from the inside of the drying device through the main pipe 203 and 4 branch pipes 202, and quickly discharges the moisture during the drying process of the refined powder to the outside. At this time, since the humidity inside the refined powder is relatively high and the air intake 201 is provided with a filter screen 206, the fan 204 will not carry the refined powder out of the room.

[0052] 4. Start the heating unit 3. Send the combustible gas into the drying device through the gas inlet pipe 301, send the combustible gas to multiple flame nozzles 302 through multiple distributors, and ignite them through their respective igniters, so that the temperature inside the drying device rises and a high-temperature environment is formed.

[0053] 5. Start the drive motor 118, drive the drive shaft 116 to rotate, and both sides of the drive shaft 116 are supported on the side walls of the outer cover 102.

[0054] 6. The drive shaft 116 is fixedly connected to the eccentric shaft 115. The movement of the drive shaft 116 drives the eccentric shaft 115 to rotate. During the rotation of the eccentric shaft 115, it drives the swing shaft 113 to do a circular motion. During the circular motion of the swing shaft 113, it drives the conveying line body 106 to vibrate up and down at a certain frequency through the support two 112. The vibration of the conveying line body 106 causes the refined powder on the conveying line body 106 to vibrate accordingly and move towards the outlet at the same time.

[0055] 7. The conveying line body 106 is arranged at a certain angle (higher at the inlet and lower at the outlet) to facilitate the rapid conveying of materials.

[0056] 8. There are convex material platforms 111 arranged at intervals on the conveying line body 106. After the refined powder passes through the convex material platforms 111, there will be a certain gap between the refined powder and the conveying line body 106, which can allow air to enter the bottom of the conveying line body 106, improve the air permeability of the material, and play a certain role in improving drying.

[0057] 9. When the refined powder is sequentially and passively conveyed from the inlet of the conveying line body 106 to the outlet, the drying process of the refined powder is completed. Then it falls into the receiving vehicle 4 from the discharge port 103.

[0058] 10. A vibration isolation spring base 105 is installed at the bottom of the entire drying device, which can reduce the vibration impact of the equipment on the ground during operation.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; thus, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A fine powder drying device, comprising a drying main unit; characterized in that: The drying main unit comprises an outer cover, a powder inlet is arranged at the top of one side of the outer cover, a powder conveying line is arranged inside the outer cover, and the head end of the powder conveying line is located below the powder inlet; A heating unit for heating the powder is provided below the powder conveying line and inside the outer cover; A powder discharge port is provided at the bottom of the other side of the outer cover, and the powder discharge port is located below the end of the powder conveying line; The top of the outer cover is also provided with an exhaust unit for extracting moisture from the refined powder; The exhaust unit comprises a transversely arranged main pipe and a plurality of vertical branch pipes connected to the main pipe, wherein the branch pipes are respectively arranged perpendicularly to the main pipe, and the top of the branch pipe is connected to the bottom of the main pipe; the two ends of the main pipe are blocked, and the middle of the main pipe is connected to a fan for exhausting air; an air suction inlet is arranged at the bottom of the branch pipe, and a through hole connected to the air suction inlet is arranged at the top of the outer cover, the air suction inlet covers the corresponding through hole, and the air suction inlet is connected to the outer cover; The powder conveying line comprises a conveying line body, the conveying line body is tilted, and the front end of the conveying line body is high and the rear end is low; and a support 1 is arranged at the bottom of the front end of the conveying line body, the support 1 is hinged with the support 3, and a support bottom plate is arranged at the bottom of the support 3, and is fixed to the inner wall of the outer cover through the support bottom plate; A support 2 is provided at the bottom of the end of the conveyor body, the top of the support 2 is fixedly connected to the bottom of the conveyor body, the bottom of the support 2 is hinged to one end of the swing shaft through a pin shaft 1, and the other end of the swing shaft is rotatably connected to the eccentric shaft structure; The eccentric shaft structure comprises two symmetrically arranged eccentric shafts, and the two eccentric shafts are of the same size and shape and are concentric; a driving shaft extending outward is respectively arranged at the outer axis center of the two eccentric shafts, and a journal is arranged between the two eccentric shafts, and the journal is located at a non-center position; The other end of the swing shaft is sleeved outside the journal and is rotatably connected to the journal; After the driving shafts pass through the through holes in the side wall of the outer cover, one of the driving shafts is driven to rotate by a driving motor.

2. A fine powder drying device according to claim 1, characterized in that: Two vibration isolation spring bases are arranged at the bottom of the outer cover.

3. A fine powder drying device according to claim 1, characterized in that: A plurality of air inlets are arranged at the lower part of the side wall of the outer cover.

4. A fine powder drying device according to claim 1, characterized in that: The refined powder is discharged from the powder discharge port and then transported by a receiving vehicle.

5. A fine powder drying device according to claim 1, characterized in that: The air suction inlet adopts a bell-mouth type air suction inlet.

6. A refined powder drying device according to claim 1 or 5, characterized in that: The air suction inlet is provided with a filter.

7. A fine powder drying device according to claim 1, characterized in that: The heating unit adopts a tubular gas heater, which includes a gas channel cross tube, a plurality of flame nozzles are arranged on the gas channel cross tube, a gas inlet pipe is arranged at the bottom of the gas channel cross tube, and the top of the gas inlet pipe is connected to the gas channel cross tube; and the gas inlet pipe, the gas channel cross tube, and the flame nozzle are all located in the outer cover, below the powder conveying line; and the bottom of the gas inlet pipe is connected to the gas source after passing through the outer cover.

8. A fine powder drying device according to claim 1, characterized in that: The drive motor base is installed on the outer wall of the outer cover, and the motor shaft of the drive motor is connected to the drive shaft to drive the drive shaft to rotate; A baffle is provided on each of the left and right sides of the conveyor line body; The conveyor belt of the conveyor line body is provided with protruding platforms at intervals.

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