A preparation system for soft magnetic reduced iron powder

Abstract

The invention discloses a preparation system of soft magnetic reduced iron powder, comprising a circular track, an arc-shaped kiln body slidable on the track, drive motors installed on both sides of the kiln body, the upper wall and side walls of the kiln body are stacked with aluminum silicate refractory bricks, a shielding shed is fixed on the kiln body, and an unloading platform and a loading platform are arranged between the shielding shed and the kiln body. The kiln body of the present application rotates along the circular track, does not require a trolley and a push plate, and the fired products are directly stacked on the ground. The kiln body is driven by a drive motor to rotate at a certain speed. Because there is no kiln car, the kiln body can be made very wide, which greatly improves the production capacity and can be increased to more than 2 times.

Description

Technical Field

[0001] The invention relates to the field of powder metallurgy tunnel kiln, in particular to a preparation system of soft magnetic reduced iron powder. Background Art

[0002] Due to the wide application of powder metallurgy, more and more enterprises are producing sponge iron in tunnel kilns, and they are gradually developing into large and long kilns. When producing sponge iron, industrial gases such as blast furnace gas, converter gas, coke oven gas, or a mixture of several gases are used as combustion media. Due to factors such as unstable supply of industrial gas, low calorific value, and large amount of waste gas, there are generally disadvantages such as high kiln pressure, high temperature at the bottom of the kiln car, and high loss of kiln wheels, shafts, and bearings.

[0003] A tunnel kiln is generally a long straight tunnel with fixed walls and vaults on both sides and the top, and a kiln car running on the track at the bottom. The combustion equipment is located on both sides of the middle of the tunnel kiln, forming a fixed high-temperature zone - the firing zone. The high-temperature flue gas generated by the combustion flows along the tunnel toward the kiln head under the action of the chimney or induced draft fan at the front end of the tunnel kiln, and gradually preheats the products entering the kiln. This section constitutes the preheating zone of the tunnel kiln. Cold air is blown into the kiln tail of the tunnel kiln to cool the products in the last section of the tunnel kiln. After the blown cold air flows through the products and is heated, it is drawn out and sent to the dryer as a heat source for drying the green body. This section constitutes the cooling zone of the tunnel kiln.

[0004] The mobile tunnel kiln is a circular track laid on the ground, on which there is an arc-shaped kiln body that can move along the track. In the space inside the track, the blanks to be fired are placed at a certain interval. The kiln body moves on the track through the driving wheel, and the blanks in the circular track are fired in sequence. The production efficiency is higher than that of a straight tunnel kiln or a tunnel kiln with a fixed kiln body. The kiln body of the mobile tunnel kiln provided by the prior art is usually divided into a drying section, a preheating section, a roasting section, a heat preservation section and a cooling section.

[0005] The existing mobile tunnel kilns have the disadvantages of poor thermal insulation effect, low working efficiency, and high environmental dust. Summary of the invention

[0006] The purpose of the present invention is to solve the above deficiencies in the prior art and provide a system for preparing soft magnetic reduced iron powder.

[0007] In order to achieve the above objectives, the following technical solutions are provided:

[0008] A preparation system for soft magnetic reduced iron powder comprises a circular track, an arc-shaped kiln body slidable on the track, drive motors are installed on both sides of the kiln body, the upper wall and side walls of the kiln body are built with aluminum silicate refractory bricks, a shielding shed is fixed on the kiln body, an unloading platform and a loading platform are arranged between the shielding shed and the kiln body, the loading platform comprises a double powder canning machine, a capping bin, a first coal powder dust collector, a second coal powder dust collector, an air pump, a compressed air storage tank, an available bin, a first bucket elevator, a second bucket elevator, an iron powder feeding bin and a coal powder feeding bin, the double powder canning machine comprises an iron powder bin, a coal powder bin, a quantitative bin placed under the iron powder bin and the coal powder bin, a material guide cloth bag connected below the quantitative bin, and a The kiln body is hollow, and a single tube is installed above the iron powder bin and the coal powder bin. The bottom end of the second bucket is connected to the iron powder feeding bin, and the top is connected to the single tube of the iron powder bin of the double powder filling machine. The bottom end of the first bucket is connected to the coal powder feeding bin, and the top is connected to the single tube of the coal powder bin of the double powder filling machine. The compressed air storage tank is connected to the air pump, and the air pump is connected to the quantitative bin valve; the unloading platform includes a hoisting mechanism, a first bag dust collector, a water tank placed below the first bag dust collector, a cyclone dust collector, a second bag dust collector, a waste bin placed below the second bag dust collector, and a sponge iron storage mechanism, a vacuum pump connected to the first bag dust collector and the cyclone dust collector, and the kiln body below the hoisting mechanism is hollow.

[0009] Preferably, a dual-channel conveying mechanism is provided below the material guiding cloth bag of the double powder canning machine, and the dual-channel conveying mechanism comprises a transmission chain, a conveying plate fixed above the transmission chain, a partition dividing the conveying plate into two along the transmission direction, scrapers equally spaced on the conveying plate, and a transmission gear set driving the transmission chain, the conveying plate is divided into two parts by the partition and comprises a first part and a second part, the first part is provided with two layers of annular lower leakage holes, the second part is provided with one layer of fan-shaped lower leakage holes and three layers of annular lower leakage holes, the tank group comprises a plurality of single tank bodies, the single tank bodies comprise a first cylindrical cavity, a second annular cavity and a third annular cavity, and are separated from each other, one layer of fan-shaped lower leakage holes corresponds to the first cylindrical cavity, the second layer of annular lower leakage holes corresponds to the second annular cavity, and the three layers of annular lower leakage holes correspond to the third annular cavity.

[0010] Preferably, the single tube includes a tube body, a spiral transmission shaft disposed in the tube body, a power device for driving the spiral transmission shaft to rotate, and leakage holes are evenly opened at the lower part of the tube body.

[0011] Preferably, lightweight mullite bricks are laid between the circular tracks, and tank bodies are arranged at equal intervals on the lightweight mullite bricks.

[0012] Preferably, the materials of the aluminum silicate refractory bricks are aluminum silicate refractory fibers, high-purity knitted blankets, high-purity modules and zirconium-containing modules, and fiber modules with different heat resistance levels are used according to different temperature zones.

[0013] Preferably, a volcanic slag base layer is laid under the circular track, and lightweight clay and porous sintered bricks are arranged between the volcanic slag base layer and the lightweight mullite bricks.

[0014] Beneficial effects:

[0015] 1. The kiln body of the present application rotates along a circular track, does not require a trolley and a push plate, and the fired materials are directly stacked on the ground. The kiln body is driven by a driving motor and rotates at a certain speed. Because there is no kiln car, the kiln body can be made very wide, which greatly improves the production capacity and can be increased by more than 2 times.

[0016] 2. The materials of aluminum silicate refractory bricks are aluminum silicate refractory fibers, high-purity knitted blankets, high-purity modules and zirconium-containing modules. Fiber modules with different heat resistance levels are used according to different temperature zones. A volcanic slag base is laid under the circular track. There are lightweight clay and porous sintered bricks between the volcanic slag base and the lightweight mullite bricks, which have good insulation and heat preservation effects. In this application, all the heat emitted by the burnt product has been sent to the roasting section by the wind entering the kiln for combustion assistance and preheating. The kiln body can expand and contract freely during thermal expansion and contraction. The kiln wall is made of aluminum silicate refractory bricks, which not only reduces the weight of the kiln body and the thermal expansion and contraction stress of the kiln body, but also prevents kiln cracks. The thickened kiln wall with redundant design can withstand longer airflow erosion, thereby increasing the service life and extending the overhaul cycle.

[0017] 3. The loading platform adopts single-tube spiral multi-outlet filling technology to achieve quantitative and gradient filling, with the characteristics of high filling efficiency and accurate quantitative filling.

[0018] 4. The unloading platform adopts a lifting mechanism to replace the original manual unloading, reducing labor intensity and improving production efficiency.

[0019] 5. The cyclone dust collector and the second bag dust collector form a secondary dust removal device to better clean the powder generated during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the overall top view;

[0021] Figure 2 This is a cross-sectional view of the kiln body;

[0022] Figure 3 This is a schematic diagram of the unloading platform and loading platform;

[0023] Figure 4 for Figure 3 End view in CC direction;

[0024] Figure 5 for Figure 3 End view in the middle DD direction;

[0025] Figure 6 This is a schematic diagram of a double powder canning machine;

[0026] Figure 7 It is a front view schematic diagram of the dual-channel transmission mechanism;

[0027] Figure 8 It is a schematic diagram of the reverse side of the dual-channel transmission mechanism;

[0028] Fig. 9 This is a main drawing of a single tank;

[0029] Fig.10 It is a cross-sectional view of a single tank;

[0030] Fig.11 for Figure 3 End view in the AA direction;

[0031] Fig.12 for Figure 3 End view in the middle BB direction;

[0032] Fig.13 Schematic diagram of the lifting mechanism. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0034] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In addition, in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figure 1 and 2 A preparation system of soft magnetic reduced iron powder is shown, comprising a circular track 1, an arc-shaped kiln body 2 slidable on the track 1, the kiln body 2 occupies two-thirds of the track 1, drive motors are installed on both sides of the kiln body 2, the upper wall and side walls of the kiln body 2 are stacked with aluminum silicate refractory bricks 22, a shielding shed 20 is fixed on the kiln body 2, and an unloading platform 300 and a loading platform 100 are arranged between the shielding shed 20 and the kiln body 2, as shown in FIG. Figure 3-6 The loading platform 100 shown includes a double powder filling machine 120, a capping bin 101, a first coal powder dust collector 107, a second coal powder dust collector 110, an air pump 108, a compressed air storage tank 109, an available bin 104, a first bucket 113, a second bucket 103, an iron powder loading bin 102 and a coal powder loading bin 105. The double powder filling machine 120 includes an iron powder bin 125, a coal powder bin 121, a quantitative bin 122 placed under the iron powder bin 125 and the coal powder bin 121, and a material guide bag connected to the bottom of the quantitative bin 122. 123, the kiln body 2 below the material guide bag 123 is hollowed out, a single tube 106 is installed above the iron powder bin 125 and the coal powder bin 121, the bottom end of the second bucket 103 is connected to the iron powder feeding bin 102, and the top end is connected to the single tube 106 of the iron powder bin 125 of the double powder filling machine, the bottom end of the first bucket 113 is connected to the coal powder feeding bin 105, and the top end is connected to the single tube 106 of the coal powder bin 121 of the double powder filling machine, the compressed air storage tank 109 is connected to the air pump 108, and the air pump 108 is connected to the valve of the quantitative bin 122;

[0037] The double-powder canning machine has a double-channel conveying mechanism below the guide bag 123. Figure 7-8 The double-channel transmission mechanism shown includes a transmission chain 209, a transmission plate 202 fixed above the transmission chain 209, a partition 205 that divides the transmission plate 202 into two along the transmission direction, scrapers 206 distributed on the transmission plate 202 at equal intervals, and a transmission gear set 201 that drives the transmission chain 209. The shaft of the transmission gear set is installed on the gantry through a bearing. The transmission plate 202 is divided into two parts by the partition 205, including a first part and a second part. The first part is provided with two layers of annular lower leakage holes 204, and the second part is provided with a layer of fan-shaped lower leakage holes 207 and three layers of annular lower leakage holes 208. The tank group 5 includes a plurality of single tank bodies 50, as shown in FIG. Figure 9-10The single tank body 50 shown includes a first cylindrical cavity 501, a second annular cavity 502 and a third annular cavity 503, and is separated from each other. The first layer of fan-shaped lower leakage holes 207 corresponds to the first cylindrical cavity 501, the second layer of annular lower leakage holes 204 corresponds to the second annular cavity 502, and the third layer of annular lower leakage holes 208 corresponds to the third annular cavity 503.

[0038] like Figure 11-13 The unloading platform 300 shown includes a hoisting mechanism 311, a first bag dust collector 307, a water tank 308 placed below the first bag dust collector 307, a cyclone dust collector 304, a second bag dust collector 302, a waste bin 303 placed below the second bag dust collector 302, a vacuum pump 305 and a sponge iron storage mechanism 301. The first bag dust collector 307 and the cyclone dust collector 304 are connected to the vacuum pump 305. The kiln body 2 below the hoisting mechanism 311 is hollowed out to facilitate the removal of finished products.

[0039] The single tube 106 includes a tube body, a spiral transmission shaft placed in the tube body, a power device for driving the spiral transmission shaft to rotate, and leakage holes are evenly opened at the lower part of the tube body.

[0040] Lightweight mullite bricks 23 are laid between the circular tracks 1, and tank bodies are arranged at equal intervals on the lightweight mullite bricks 23 .

[0041] The materials of the aluminum silicate refractory bricks 22 are aluminum silicate refractory fibers, high-purity knitted blankets, high-purity modules and zirconium-containing modules. Fiber modules with different heat resistance levels are used according to different temperature zones.

[0042] A volcanic slag base layer 25 is laid under the circular track 1 , and lightweight clay and porous sintered bricks 24 are arranged between the volcanic slag base layer 25 and the lightweight mullite bricks 23 .

[0043] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A system for preparing soft magnetic reduced iron powder, comprising a circular track and an arc-shaped kiln body slidable on the track, characterized in that: Driving motors are installed on both sides of the kiln body. The upper wall and side walls of the kiln body are built with aluminum silicate refractory bricks. A shielding shed is fixed on the kiln body. An unloading platform and a loading platform are arranged between the shielding shed and the kiln body. The loading platform includes a double powder canning machine, a capping bin, a first coal powder dust collector, a second coal powder dust collector, an air pump, a compressed air storage tank, an available bin, a first bucket elevator, a second bucket elevator, an iron powder feeding bin and a coal powder feeding bin. The double powder canning machine includes an iron powder bin, a coal powder bin, a quantitative bin placed under the iron powder bin and the coal powder bin, a material guide bag connected to the bottom of the quantitative bin, the kiln body below the material guide bag is hollowed out, and a single The bottom end of the second bucket is connected to the iron powder feeding bin, and the top end is connected to the single tube of the iron powder bin of the double powder filling machine. The bottom end of the first bucket is connected to the coal powder feeding bin, and the top end is connected to the single tube of the coal powder bin of the double powder filling machine. The compressed air storage tank is connected to the air pump, and the air pump is connected to the quantitative bin valve; the unloading platform includes a hoisting mechanism, a first bag dust collector, a water tank placed below the first bag dust collector, a cyclone dust collector, a second bag dust collector, a waste bin placed below the second bag dust collector, and a sponge iron storage mechanism, a vacuum pump connected to the first bag dust collector and the cyclone dust collector, and the kiln body below the hoisting mechanism is hollow; A double-channel conveying mechanism is provided below the guide bag of the double powder canning machine, and the double-channel conveying mechanism includes a transmission chain, a transmission plate fixed above the transmission chain, a partition that divides the transmission plate into two parts along the transmission direction, scrapers that are evenly spaced on the transmission plate, and a transmission gear set that drives the transmission chain. The transmission plate is divided into two parts by the partition, including a first part and a second part. The first part is provided with two layers of annular lower leakage holes, and the second part is provided with one layer of fan-shaped lower leakage holes and three layers of annular lower leakage holes. The tank group includes a plurality of single tank bodies, and the single tank bodies include a first cylindrical cavity, a second annular cavity, and a third annular cavity, and are separated from each other. One layer of fan-shaped lower leakage holes corresponds to the first cylindrical cavity, the second layer of annular lower leakage holes corresponds to the second annular cavity, and the third layer of annular lower leakage holes corresponds to the third annular cavity. The single tube comprises a tube body, a spiral transmission shaft arranged in the tube body and a power device for driving the spiral transmission shaft to rotate, and leakage holes are evenly opened at the lower part of the tube body.

2. A system for preparing soft magnetic reduced iron powder according to claim 1, characterized in that: Lightweight mullite bricks are laid between the circular tracks, and tank bodies are arranged at equal intervals on the lightweight mullite bricks.

3. The system for preparing soft magnetic reduced iron powder according to claim 1, characterized in that: The materials of aluminum silicate refractory bricks are aluminum silicate refractory fibers, high-purity knitted blankets, high-purity modules and zirconium-containing modules. Fiber modules with different heat resistance levels are used according to different temperature zones.

4. A system for preparing soft magnetic reduced iron powder according to claim 2, characterized in that: A volcanic slag base is laid under the circular track, and lightweight clay and porous sintered bricks are placed between the volcanic slag base and the lightweight mullite bricks.

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