In-furnace automatic rotary material distribution device and material distribution method for silicon iron heat furnace

Abstract

The invention discloses an in-furnace automatic rotary material distribution device for a silicon iron heat furnace, and relates to the technical field of industrial silicon furnace main body equipment. The device comprises a discharging assembly, a rotating assembly and a swinging assembly. The discharging assembly comprises a discharging barrel and a guide groove, the bottom of the discharging barrel is fixedly connected with a first connecting base, and the outer portion of the guide groove is fixedly connected with a second connecting base; the rotating assembly comprises a driven gear ring, the driven gear ring is fixedly connected to the outer portion of the discharging barrel, a mounting bin is fixedly connected to the outer portion of the discharging barrel, a sealing cover is fixedly connected to the top of the mounting bin, and a hydraulic motor is fixedly connected to the top of the sealing cover; the swing assembly comprises a hydraulic oil cylinder, and a sliding rod is installed at the output end of the hydraulic oil cylinder. Through forward and reverse rotation of the hydraulic motor and downward movement of the output end of the hydraulic oil cylinder, the material guide groove horizontally moves while rotating, raw materials can be evenly laid in the hot furnace, and deterioration of the furnace condition is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial silicon furnace electric furnace main equipment, and particularly relates to an automatic rotary material distribution device and a material distribution method in a ferrosilicon ore arc furnace. Background Art

[0002] Ferrosilicon submerged arc furnace is a key equipment in the field of mining and steel smelting. It is mainly used to reduce ore, carbonaceous reducing agent and solvent to produce ferrosilicon and other ferroalloys. Ferrosilicon, an alloy synthesized by silicon and iron, is widely used in steel, casting, chemical and electronic industries due to its high strength, excellent electrical conductivity and wear resistance. During the smelting process, ferrosilicon not only participates in the reduction reaction of iron as a reducing agent, but also generates alloys such as ferrosilicon to improve the strength, hardness and corrosion resistance of iron. Ferrosilicon submerged arc furnace uses carbon or magnesium refractory materials, and uses arc and resistance energy to melt metal through self-training electrodes and submerged arc operation. Its smelting process covers pretreatment, melting and steel tapping to achieve continuous operation. At the same time, as a high-power consumption equipment, ferrosilicon submerged arc furnace is developing in the direction of high power and large-scale, and introducing advanced technologies such as low-frequency smelting, smoke exhaust and dust removal and energy recovery to improve thermal efficiency and productivity. In short, ferrosilicon submerged arc furnace occupies an important position in the metallurgical industry and provides solid support for ferroalloy production.

[0003] The smooth progress of industrial silicon smelting depends not only on the correct ingredients, but more importantly on uniform distribution and appropriate material surface shape. Because the smelting silica of industrial silicon relies on coke for reduction, uneven distribution will cause uneven reducing agent in the furnace, which will not only affect the smooth progress of smelting, but also destroy the current distribution in the furnace, affect the deep insertion of electrodes, cause unbalanced temperature gradient in the furnace, reduce the smelting crucible, and deteriorate the furnace condition.

[0004] In the past, the material distribution in the industrial silicon smelting furnace was carried out by fixed material pipes and fixed-point material unloading, and manual or mechanical material pushing. This method increases the intensity of manual work. Manual or mechanical work cannot accurately control the material due to human control, which will lead to uneven thickness of the material layer, affecting the deterioration of the smelting environment in the furnace. Manual intervention in the material distribution process takes a long time, has poor continuity, and cannot be continuously distributed. The temperature gradient of the furnace material layer is uneven, which affects the smelting material layer structure and causes the crucible to shrink, resulting in deterioration of the furnace condition.

[0005] To this end, we provide an automatic rotary distribution device for a ferrosilicon blast furnace to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide an automatic rotary material distribution device for a ferrosilicon ore furnace. By means of the forward and reverse rotation of a hydraulic motor and the downward movement of the output end of a hydraulic cylinder, a material guide chute can be moved horizontally while rotating, thereby solving the problem of uneven material distribution in an existing industrial silicon smelting furnace, which easily leads to deterioration of the furnace condition.

[0007] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0008] The present invention is an automatic rotary material distribution device for a ferrosilicon ore furnace, comprising a material discharging assembly, a rotating assembly and a swinging assembly; the rotating assembly and the swinging assembly are both arranged outside the material discharging assembly:

[0009] The material discharge assembly comprises a material discharge barrel and a material guide trough, the bottom of the material discharge barrel is fixedly connected with a first connection seat, and the material guide trough is rotatably connected to the outside of the first connection seat, the outside of the material guide trough is fixedly connected with a second connection seat, and the outside of the material discharge barrel is provided with a connection assembly and a cooling assembly;

[0010] The rotating assembly includes a driven gear ring, which is fixedly connected to the outside of the lower barrel, the outside of the lower barrel is fixedly connected to a mounting bin, the top of the mounting bin is fixedly connected to a cover, the top of the cover is fixedly connected to a hydraulic motor, the output end of the hydraulic motor is fixedly connected to a driving gear, and the driving gear is meshed with the driven gear ring;

[0011] The swing assembly comprises a hydraulic cylinder, a sliding rod is installed at the output end of the hydraulic cylinder, and a connecting rod is rotatably connected between the sliding rod and the second connecting seat.

[0012] The present invention is further configured such that the connection assembly includes an insulation disk, the insulation disk is movably sleeved on the outside of the discharge barrel, and the slide rod is movably sleeved on the inside of the insulation disk, and the inside of the insulation disk is filled with insulation cotton.

[0013] The present invention is further configured such that the connecting assembly also includes a bearing seat, the bearing seat is fixedly connected to the top of the insulation plate, a sealed bearing is installed inside the bearing seat, and the sealed bearing is installed on the outside of the discharge barrel.

[0014] The present invention is further configured such that the cooling assembly includes a cooling bin, which is fixedly connected to the outside of a lower barrel, to which a cold liquid pipe and a hot liquid pipe are fixedly connected, to which a plurality of cooling fins are fixedly connected, and the plurality of cooling fins are all located inside the cooling bin.

[0015] The present invention is further configured such that the cold liquid pipe and the hot liquid pipe are both connected to the cooling bin, and the cold liquid pipe and the hot liquid pipe are respectively close to the bottom and the top of the cooling bin.

[0016] The present invention is further configured such that the bearing seat is a hollow structure, and the outside of the bearing seat is fixedly connected with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are both connected to the bearing seat, and the liquid inlet pipe and the liquid outlet pipe are respectively distributed on both sides of the bearing seat.

[0017] The present invention is further configured such that the output end of the hydraulic cylinder is fixedly connected with an insert block, and the insert block is a square block, the top of the sliding rod is fixedly connected with a third connecting seat, and the insert block is movably inserted into the interior of the third connecting seat, the interior of the third connecting seat is rotatably connected with a fixing screw, and the fixing screw is threadedly sleeved into the interior of the insert block.

[0018] The present invention is further configured such that the top of the heat insulation plate is fixedly connected to a fixing frame, the mounting bin is fixedly connected to the top of the fixing frame, and the hydraulic cylinder is fixedly connected to the outside of the fixing frame.

[0019] At the same time, in order to solve the above technical problems, the present invention also provides the following technical solutions: a charging method for a ferrosilicon ore furnace, characterized in that the automatic rotary charging device and charging method for a ferrosilicon ore furnace described in any one of claims 1 to 3 specifically include the following steps;

[0020] S1: Start the hydraulic motor to drive the driving gear, then drive the lower barrel to rotate through the driven gear ring, and then drive the guide chute to rotate;

[0021] S2: By starting the hydraulic cylinder, the output end of the hydraulic cylinder moves downward, and then the hydraulic cylinder pushes the guide trough to rotate through the sliding rod and the connecting rod, so that the inclination angle of the guide trough gradually decreases;

[0022] S3: Raw materials are added into the lower barrel, and then added into the hot furnace along the material guide trough. The material guide trough rotates and moves horizontally at the same time, so that the raw materials can be evenly spread inside the hot furnace.

[0023] The present invention has the following beneficial effects:

[0024] 1. The present invention starts the hydraulic motor to make the hydraulic motor rotate forward and reverse, thereby driving the driving gear to rotate forward and reverse, and then drives the lower barrel to rotate through the driven gear ring meshing with the driving gear, and then drives the guide trough to rotate through the first connecting seat, and then starts the hydraulic cylinder to make the output end of the hydraulic cylinder move downward, and then the output end of the hydraulic cylinder can push the slide bar downward to push the other end of the connecting rod to push the guide trough to rotate around the first connecting seat, so that the inclination angle of the guide trough is gradually reduced. At the same time, by adding raw materials into the lower barrel, the raw materials can be added into the hot furnace along the guide trough, and the guide trough can be moved horizontally while rotating, so that the raw materials can be evenly spread inside the hot furnace to avoid deterioration of the furnace condition.

[0025] 2. The present invention injects cold water into the cooling bin through a cold liquid pipe, and then the cold water in the cooling bin exchanges heat with a plurality of cooling fins, and then the heated water is discharged through a hot liquid pipe, thereby cooling the lower barrel and preventing the hydraulic cylinder and the hydraulic motor from being damaged due to overheating of the working environment.

[0026] 3. The present invention injects coolant into the bearing seat through the liquid inlet pipe, and then the coolant entering the bearing seat can cool the sealed bearing, thereby preventing the sealed bearing from being damaged due to overheating, and then the heated coolant is discharged through the liquid outlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of the left side of the present invention.

[0029] Figure 2 It is a structural schematic diagram on the right side of the present invention.

[0030] Figure 3 It is a schematic diagram of the cross-sectional structure of the heat insulation plate, bearing seat and cooling chamber.

[0031] Figure 4 It is a schematic diagram of the disassembled state of the hydraulic cylinder and the slide rod.

[0032] Figure 5 for Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0033] Figure 6 for Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 100-feeding assembly, 101-feeding barrel, 102-material guide trough, 103-first connecting seat, 104-second connecting seat, 200-rotating assembly, 201-installing bin, 202-cover, 203-hydraulic motor, 204-driving gear, 205-driven gear ring, 300-swinging assembly, 301-hydraulic cylinder, 301a-insert block, 301b-third connecting seat, 301c-fixing screw, 302-sliding rod, 303-connecting rod, 400-connecting assembly, 401-insulating plate, 402-bearing seat, 402a-liquid inlet pipe, 402b-liquid outlet pipe, 403-sealed bearing, 404-insulating cotton, 500-cooling assembly, 501-cooling bin, 502-cold liquid pipe, 503-hot liquid pipe, 504-heat sink fins, 600-fixed frame. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1

[0038] See also Figure 1-Figure 5 The present invention is an automatic rotary material distribution device for a ferrosilicon ore furnace, comprising a material discharging assembly 100, a rotating assembly 200 and a swinging assembly 300; the rotating assembly 200 and the swinging assembly 300 are both arranged outside the material discharging assembly 100:

[0039] The material discharge assembly 100 includes a material discharge barrel 101 and a material guide trough 102. The bottom of the material discharge barrel 101 is fixedly connected to a first connection seat 103, and the material guide trough 102 is rotatably connected to the outside of the first connection seat 103. The outside of the material guide trough 102 is fixedly connected to a second connection seat. The outside of the material discharge barrel 101 is provided with a connection assembly 400 and a cooling assembly 500.

[0040] The rotating assembly 200 includes a driven gear ring 205, which is fixedly connected to the outside of the lower barrel 101, and the outside of the lower barrel 101 is fixedly connected to the installation bin 201, and the top of the installation bin 201 is fixedly connected to the cover 202, and the top of the cover 202 is fixedly connected to the hydraulic motor 203, and the output end of the hydraulic motor 203 is fixedly connected to the driving gear 204, and the driving gear 204 is meshed with the driven gear ring 205. The hydraulic motor 203 rotates forward and backward to drive the lower barrel 101 to rotate, so that the raw materials can be evenly spread around;

[0041] The swing assembly 300 includes a hydraulic cylinder 301, a sliding rod 302 is installed at the output end of the hydraulic cylinder 301, and a connecting rod 303 is rotatably connected between the sliding rod 302 and the second connecting seat 104. The output end of the hydraulic cylinder 301 is extended and retracted, so that the material guide trough 102 can be swung back and forth, so that the raw materials can be evenly scattered in a straight line, and as the rotating assembly 200 drives the lower barrel 101 to rotate, the raw materials can be evenly scattered on a circular surface centered on the lower barrel 101.

[0042] Specifically, the output end of the hydraulic cylinder 301 is fixedly connected with an insert block 301a, and the insert block 301a is a square block. The top of the slide rod 302 is fixedly connected with a third connection seat 301b, and the insert block 301a is movably inserted into the inside of the third connection seat 301b. The inside of the third connection seat 301b is rotatably connected with a fixing screw 301c, and the fixing screw 301c is threadedly sleeved into the inside of the insert block 301a. By removing the fixing screw 301c, the hydraulic cylinder 301 can be easily disassembled and repaired when it is damaged.

[0043] The connecting component 400 includes an insulation plate 401, which is movably connected to the outside of the discharge barrel 101, and the sliding rod 302 is movably connected to the inside of the insulation plate 401. The inside of the insulation plate 401 is filled with insulation cotton 404. By filling the insulation plate 401 with insulation cotton 404, the insulation capacity of the insulation plate 401 can be enhanced to prevent heat from being directly transferred to the outside and causing damage to external equipment.

[0044] Furthermore, the top of the heat insulation plate 401 is fixedly connected to a fixing frame 600 , the mounting chamber 201 is fixedly connected to the top of the fixing frame 600 , and the hydraulic cylinder 301 is fixedly connected to the outside of the fixing frame 600 .

[0045] The operation process of this embodiment is as follows: when it is necessary to add raw materials into the furnace, first, the hydraulic motor 203 is started to make the hydraulic motor 203 rotate forward and reverse, thereby driving the driving gear 204 to rotate forward and reverse, and then the lower barrel 101 is driven to rotate through the driven gear ring 205 meshing with the driving gear 204, and then the guide trough 102 is driven to rotate through the first connecting seat 103, and then the hydraulic cylinder 301 is started to make the output end of the hydraulic cylinder 301 move downward, and then the output end of the hydraulic cylinder 301 can push the sliding rod 302 downward to enable the other end of the connecting rod 303 to push the guide trough 102 to rotate around the first connecting seat 103, so that the inclination angle of the guide trough 102 is gradually reduced. At the same time, by adding raw materials into the lower barrel 101, the raw materials can be added to the hot furnace along the guide trough 102, and the guide trough 102 can be evenly spread inside the hot furnace by moving horizontally while rotating.

[0046] Example 2

[0047] See also Figure 1-Figure 5On the basis of the specific embodiment 1, the cooling assembly 500 includes a cooling bin 501, which is fixedly connected to the outside of the lower barrel 101, and a cold liquid pipe 502 and a hot liquid pipe 503 are fixedly connected to the outside of the lower barrel 101, and a plurality of heat dissipation fins 504 are fixedly connected to the outside of the lower barrel 101, and the plurality of heat dissipation fins 504 are all located inside the cooling bin 501. By injecting cold water into the cooling bin 501, the upper end of the lower barrel 101 can be cooled, thereby avoiding damage caused by overheating of the working environment of the hydraulic cylinder 301 and the hydraulic motor 203. By setting a plurality of heat dissipation fins 504, the heat exchange area can be increased and the heat exchange efficiency can be improved.

[0048] The connecting assembly 400 also includes a bearing seat 402 , which is fixedly connected to the top of the heat insulation plate 401 , and a sealed bearing 403 is installed inside the bearing seat 402 , and the sealed bearing 403 is installed on the outside of the discharge barrel 101 .

[0049] Specifically, the bearing seat 402 is a hollow structure, and the outside of the bearing seat 402 is fixedly connected with a liquid inlet pipe 402a and a liquid outlet pipe 402b, the liquid inlet pipe 402a and the liquid outlet pipe 402b are both connected to the bearing seat 402, and the liquid inlet pipe 402a and the liquid outlet pipe 402b are respectively distributed on both sides of the bearing seat 402, and the sealed bearing 403 can be cooled by injecting coolant into the interior of the bearing seat 402 to prevent the sealed bearing 403 from overheating and damage.

[0050] Furthermore, the cold liquid pipe 502 and the hot liquid pipe 503 are both connected to the cooling chamber 501 , and the cold liquid pipe 502 and the hot liquid pipe 503 are respectively close to the bottom and the top of the cooling chamber 501 .

[0051] The operation process of this embodiment is as follows: when the lower barrel 101 needs to be cooled, cold water is firstly injected into the cooling bin 501 through the cold liquid pipe 502, and then the cold water in the cooling bin 501 performs heat exchange with the plurality of heat dissipation fins 504, so that the lower barrel 101 can be cooled, and then the heated water is discharged through the hot liquid pipe 503;

[0052] When the sealed bearing 403 is working, coolant is injected into the bearing seat 402 through the liquid inlet pipe 402a, and then the coolant entering the bearing seat 402 can cool the sealed bearing 403, and then the heated coolant is discharged through the liquid outlet pipe b.

[0053] Example 3

[0054] See also Figure 1-Figure 5 On the basis of the specific embodiment 1 and the specific embodiment 2, specifically, an automatic rotary material distribution device and material distribution method for a ferrosilicon ore furnace specifically include the following steps:

[0055] S1: Start the hydraulic motor 203 to drive the driving gear 204, and then drive the lower barrel 101 to rotate through the driven gear ring 205, and then drive the guide trough 102 to rotate;

[0056] S2: By starting the hydraulic cylinder 301, the output end of the hydraulic cylinder 301 moves downward, and then the hydraulic cylinder 301 pushes the guide trough 102 to rotate through the sliding rod 302 and the connecting rod 303, so that the inclination angle of the guide trough 102 gradually decreases;

[0057] S3: Raw materials are added into the lower barrel 101, and then the raw materials are added into the hot furnace along the material guide trough 102. The material guide trough 102 rotates and moves horizontally at the same time, so that the raw materials can be evenly spread in the hot furnace.

[0058] In addition, it should be noted that the components not described in detail in this article are prior art.

[0059] It should be noted that 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An automatic rotary material distribution device for a ferrosilicon ore furnace, comprising a material discharging assembly (100), a rotating assembly (200) and a swinging assembly (300); characterized in that: The rotating assembly (200) and the swinging assembly (300) are both arranged outside the blanking assembly (100): The material discharge assembly (100) comprises a material discharge barrel (101) and a material guide trough (102); the bottom of the material discharge barrel (101) is fixedly connected to a first connection seat (103), and the material guide trough (102) is rotatably connected to the outside of the first connection seat (103); the outside of the material guide trough (102) is fixedly connected to a second connection seat; and the outside of the material discharge barrel (101) is provided with a connection assembly (400) and a cooling assembly (500); The rotating assembly (200) comprises a driven gear ring (205), wherein the driven gear ring (205) is fixedly connected to the outside of the lower barrel (101), the outside of the lower barrel (101) is fixedly connected to a mounting bin (201), the top of the mounting bin (201) is fixedly connected to a sealing cover (202), the top of the sealing cover (202) is fixedly connected to a hydraulic motor (203), the output end of the hydraulic motor (203) is fixedly connected to a driving gear (204), and the driving gear (204) is meshed with the driven gear ring (205); The swing assembly (300) comprises a hydraulic cylinder (301), a sliding rod (302) is installed at the output end of the hydraulic cylinder (301), and a connecting rod (303) is rotatably connected between the sliding rod (302) and the second connecting seat (104).

2. The automatic rotary charging device for a ferrosilicon ore furnace according to claim 1, characterized in that: The connecting assembly (400) includes a heat-insulating plate (401), the heat-insulating plate (401) is movably sleeved on the outside of the discharge barrel (101), and the sliding rod (302) is movably sleeved on the inside of the heat-insulating plate (401), and the inside of the heat-insulating plate (401) is filled with heat-insulating cotton (404).

3. The automatic rotary charging device for a ferrosilicon ore furnace according to claim 2, characterized in that: The connecting assembly (400) further comprises a bearing seat (402), wherein the bearing seat (402) is fixedly connected to the top of the heat insulating plate (401), a sealed bearing (403) is installed inside the bearing seat (402), and the sealed bearing (403) is installed outside the lower barrel (101).

4. The automatic rotary charging device for a ferrosilicon ore furnace according to claim 1, characterized in that: The cooling assembly (500) includes a cooling bin (501), wherein the cooling bin (501) is fixedly connected to the outside of a lower barrel (101), a cold liquid pipe (502) and a hot liquid pipe (503) are fixedly connected to the outside of the lower barrel (101), and a plurality of heat dissipation fins (504) are fixedly connected to the outside of the lower barrel (101), and the plurality of heat dissipation fins (504) are all located inside the cooling bin (501).

5. The automatic rotary charging device for a ferrosilicon ore furnace according to claim 4, characterized in that: The cold liquid pipe (502) and the hot liquid pipe (503) are both connected to the cooling bin (501), and the cold liquid pipe (502) and the hot liquid pipe (503) are respectively close to the bottom and the top of the cooling bin (501).

6. The automatic rotary charging device for a ferrosilicon ore furnace according to claim 3, characterized in that: The bearing seat (402) is a hollow structure, and a liquid inlet pipe (402a) and a liquid outlet pipe (402b) are fixedly connected to the outside of the bearing seat (402), and the liquid inlet pipe (402a) and the liquid outlet pipe (402b) are both connected to the bearing seat (402), and the liquid inlet pipe (402a) and the liquid outlet pipe (402b) are respectively distributed on both sides of the bearing seat (402).

7. The automatic rotary charging device for a ferrosilicon ore furnace according to claim 1, characterized in that: The output end of the hydraulic cylinder (301) is fixedly connected to an insert block (301a), and the insert block (301a) is a square block. The top of the sliding rod (302) is fixedly connected to a third connecting seat (301b), and the insert block (301a) is movably inserted into the interior of the third connecting seat (301b). The interior of the third connecting seat (301b) is rotatably connected to a fixing screw (301c), and the fixing screw (301c) is threadedly sleeved into the interior of the insert block (301a).

8. The automatic rotary charging device for a ferrosilicon ore furnace according to claim 2, characterized in that: The top of the heat insulation plate (401) is fixedly connected to a fixing frame (600), and the mounting chamber (201) is fixedly connected to the top of the fixing frame (600), and the hydraulic cylinder (301) is fixedly connected to the outside of the fixing frame (600).

9. A method for distributing material for a ferrosilicon ore furnace, characterized in that: The automatic rotary material distribution device and material distribution method for a ferrosilicon ore furnace according to any one of claims 1 to 8 specifically comprises the following steps: S1: Start the hydraulic motor (203) to drive the driving gear (204), and then drive the lower barrel (101) to rotate through the driven gear ring (205), and then drive the guide trough (102) to rotate; S2: By starting the hydraulic cylinder (301), the output end of the hydraulic cylinder (301) moves downward, and then the hydraulic cylinder (301) pushes the material guide trough (102) to rotate through the sliding rod (302) and the connecting rod (303), so that the inclination angle of the material guide trough (102) gradually decreases; S3: Raw materials are added into the lower barrel (101), and then the raw materials are added into the hot furnace along the material guide trough (102). The material guide trough (102) rotates and moves horizontally at the same time, so that the raw materials can be evenly spread in the hot furnace.

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