A large continuous mixer

Abstract

The present invention discloses a large-scale continuous mixer, which comprises a drum, a stirring and pushing rotor, a supporting and blocking drum device, a discharging machine tail, a feeding machine head, a stirring and pushing rotor driving device, a drum driving device and a frame. The drum is inclined and placed on the supporting and blocking drum device. The feeding machine head and the discharging machine tail are respectively rotationally and cooperatively connected with the two ends of the drum through dynamic sealing mechanisms. The stirring and pushing rotor comprises a rotating shaft, mixing paddle blades and a pushing screw blade. The rotating shaft is offset inside the drum. Multiple groups of mixing paddle blades are installed on the rotating shaft at intervals. The pushing screw blade is installed at one end of the rotating shaft close to the discharging machine tail. The rotating direction of the rotating shaft is opposite to that of the drum, and the rotating speed of the rotating shaft is greater than that of the drum. The large-scale continuous mixer provided by the present invention can enable the materials to be repeatedly dispersed and blended during the mixing and pushing processes, and the materials can be mixed evenly and uniformly in a very short time. The raw materials are mixed and pushed at the same time, so as to realize the mixing and continuous feeding and discharging of the raw materials, and improve the production efficiency and production capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of raw material mixing equipment, and particularly to a large continuous mixer suitable for iron ore mixing. Background Art

[0002] The main raw materials for ironmaking are iron ore, coke, limestone, etc. Iron ores include hematite, magnetite, etc. Before smelting, ore dressing is required to remove other impurities and improve the grade of iron ore. Then, after crushing and grinding, various iron ore raw materials with different particle sizes are proportioned, mixed by a mixer, made into particles of different shapes by a pelletizing machine, and the prepared granular iron ore raw materials are placed into a sintering furnace to be sintered into ironmaking raw materials. The traditional pelletizing methods mainly include: sintering method: a method of mixing secondary ore powder and concentrate powder and then sintering into blocks under the condition of incomplete melting by high-temperature heating; pelletizing method: a method of mixing fine concentrate powder, wetting it with water on a pelletizing device and rolling it into green pellets, and then roasting and consolidating; briquetting method: a method of pressing the mixed powdery material in a mold to form briquettes with a certain shape and size. These pelletizing methods all have certain defects: high energy consumption, high carbon emissions, low production efficiency, high porosity of products, etc.

[0003] Chinese Patent with publication number 113862469A discloses a single-shaft vacuum high-strength blast furnace hematite extruder, which replaces the traditional pelletizing method by extrusion, greatly improving the production rate. When using this extruder for basic pelletizing, it is necessary to proportion various iron ore raw materials first, mix them evenly by a mixer, and then send them into the extruder. However, the traditional iron ore mixer does not have a rotor, and the stirring is not uniform enough. Especially, the mixing of adding water to fine powder does not meet the technical requirements of extrusion pelletizing. At the same time, the single-machine production capacity of the traditional iron ore mixer is small and no longer meets the production capacity requirements of extrusion pelletizing. Summary of the Invention

[0004] Aiming at the problems existing in the above technologies, the present invention provides a large continuous mixer, which can achieve uniform mixing of materials in a very short time, and realizes continuous feeding and discharging during the material kneading process, improving the mixing production capacity.

[0005] The technical solution adopted by the present invention is as follows: A large continuous mixer includes a drum, a stirring and pushing rotor, a supporting drum device, a discharging machine tail, a feeding machine head, a stirring and pushing rotor driving device, a drum driving device, and a frame;

[0006] The supporting drum device is fixedly installed on the frame, and the drum is inclined on the supporting drum device;

[0007] The drum driving device is used to drive the drum to rotate;

[0008] The feeder head includes a roller sealing cover, a feed barrel connected to the roller sealing cover, and a feed barrel shaft end sealing cover connected to the feed barrel; the discharging machine tail includes a roller sealing cover, an oblique conical barrel connected to the roller sealing cover, an oblique conical barrel shaft end sealing cover connected to the oblique conical barrel, and a discharging barrel connected to the oblique conical barrel; the roller sealing cover is rotatably connected to both ends of the roller through a dynamic sealing mechanism;

[0009] The stirring and pushing rotor includes a rotating shaft, a mixing blade, and a pushing spiral blade. The rotating shaft passes through the feed machine head, the drum, and the discharge machine tail, and the rotating shaft is offset in the drum. Multiple groups of mixing blades are installed on the rotating shaft at intervals, and the pushing spiral blade is installed at one end of the rotating shaft close to the discharge machine tail.

[0010] The stirring rotor driving device is used to drive the rotating shaft to rotate, and the rotating direction of the rotating shaft is opposite to the rotating direction of the drum, and the rotating speed of the rotating shaft is greater than the rotating speed of the drum.

[0011] Furthermore, the tilt angle of the roller is 5 to 12 degrees.

[0012] Furthermore, a load-bearing roller is welded to the outer wall of the drum, and the drum cooperates with the supporting and blocking roller device through the load-bearing roller. The supporting and blocking roller device includes two groups of supporting wheel assemblies and one group of blocking wheel assemblies. The two groups of supporting wheel assemblies are arranged on both sides of the load-bearing roller for vertically supporting the drum, and the blocking wheel assembly is arranged on one side of the load-bearing roller for laterally supporting the drum.

[0013] Furthermore, the dynamic sealing mechanism includes conical dynamic rings fixedly mounted at both ends of the drum by angle steel rings respectively, the drum sealing cover includes an end plate, a labyrinth sealing static conical ring, a conical static ring, a carbon-silicon-aluminum composite sealing plate, a spring piece, a sleeve cylinder, and a nylon ring. The outer diameter of the end plate is larger than the caliber of the drum. The sleeve cylinder is fixedly connected to the end plate and sleeved on the port of the drum. The contact surface between the sleeve cylinder and the drum is lined with the nylon ring. The conical static ring is fixed to the outer edge of the end plate and tilted toward the side close to the drum. The conical dynamic ring and the conical static ring have the same inclination angle. The labyrinth sealing static conical ring is arranged between the sleeve cylinder and the conical static ring. A plurality of carbon-silicon-aluminum composite sealing plates and spring pieces are fixed to the conical static ring by screws. A plurality of carbon-silicon-aluminum composite sealing plates are spliced in sequence through the joint. The spring piece presses the carbon-silicon-aluminum composite sealing plate and makes it close to the conical static ring and the conical dynamic ring.

[0014] Furthermore, an ash leakage port is provided below the drum sealing cover and on the end plate between the labyrinth sealing static cone ring and the sleeve cylinder, and an ash collecting cylinder is connected to the ash leakage port.

[0015] Furthermore, the mixing blade is detachably mounted on the rotating shaft, and the deflection angle of the mixing blade is adjustable.

[0016] Further, a feeding spiral blade and a reverse pushing spiral blade are also installed on the rotating shaft. The feeding spiral blade is arranged at the front end of the feeding cylinder, and the reverse pushing spiral blade is arranged at the end of the inclined conical cylinder. The spiral direction of the reverse pushing spiral blade is opposite to that of the material pushing spiral blade.

[0017] Further, high wear-resistant alloys are inlaid on the outer periphery of the spiral blades of the material pushing spiral blade, the feeding spiral blade and the reverse pushing spiral blade.

[0018] Further, high wear-resistant porcelain chips are pasted on the inner wall of the roller.

[0019] Further, manholes are respectively opened at both ends of the roller, and the manholes are closed by openable manhole covers.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) For the large continuous mixer provided by the present invention, the stirring and pushing rotor is offset inside the roller (i.e., the rotor and the roller are not concentric). The stirring and pushing rotor makes a medium-speed rotary motion, and the roller rotates at a low speed in the opposite direction. Materials are continuously fed into the roller from the machine head. The relative rotary motion with opposite directions between the roller and the stirring and pushing rotor continuously throws and tosses various raw materials, making the materials in a suspended state and generating a countercurrent motion. With the interaction between the roller and the rotor, the materials are repeatedly dispersed and blended during the mixing and pushing process. The materials can be uniformly mixed in a very short time, usually reaching the required mixing degree within 200 - 300 s. At the same time, the raw materials are continuously pushed forward obliquely by the mixing paddle blades, the material pushing spiral blade on the stirring and pushing rotor and the roller. The raw materials are mixed and pushed forward, and finally continuously discharged from the machine tail of the discharging machine, thus realizing the mixing of the raw materials and continuous feeding and discharging, changing the way of stopping for loading and discharging of the traditional mixer, greatly improving the production efficiency and production capacity, and can replace multiple traditional mixers under the condition of the same mixing production capacity.

[0022] (2) A reverse pushing spiral blade is arranged at the tail end of the stirring and pushing rotor of the present invention. The mixing paddle blades and the material pushing spiral blade have the functions of stirring and pushing the materials, and the reverse pushing spiral blade can prevent the materials from entering the gap between the machine tail of the discharging machine and the rotating shaft.

[0023] (3) High wear-resistant porcelain chips are pasted on the inner wall of the roller, and high wear-resistant alloys are inlaid on the outer periphery of the spiral blades, which can enhance the service life of the roller and the spiral.

[0024] (4) Manholes are opened at both ends of the roller barrel, which is convenient for installation, maintenance and repair.

[0025] (5) Labyrinth and dynamic and static combined seals of patch-type carbon silicon aluminum composite sealing plates are provided at the machine head and the machine tail to prevent dust from escaping into the air, and the patch-type carbon silicon aluminum composite sealing plates are easy to replace.

[0026] (6) A dust collecting cylinder is provided at the lower end of the drum seal cover, which can collect a small amount of escaped dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 is Figure 1 a schematic cross-sectional view of

[0029] Figure 3 It is a schematic diagram of the partial structure of the feed head drum seal cover.

[0030] Figure 4 It is a schematic diagram of the partial structure of the discharge tail drum seal cover.

[0031] Figure 5 It is a schematic diagram of the structure of the feed head drum seal cover. DETAILED DESCRIPTION OF THE INVENTION

[0032] For the convenience of understanding the present invention, the present invention will be described more comprehensively and carefully below in conjunction with the accompanying drawings of the specification and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0033] As Figure 1 shown, a large continuous mixer of the present embodiment includes a drum 1, a stirring and pushing rotor 2, a supporting drum device 3, a discharge tail 4, a feed head 5, a stirring and pushing rotor driving device 6, a drum driving device 7, and a frame 8. A load-bearing roller ring 101 is welded to the outer wall of the drum 1, and the drum 1 is inclined and placed on the supporting drum device 3 fixedly installed on the frame 8 through the load-bearing roller ring 101. The inclined angle of the drum 1 is 5 to 12 degrees. The supporting drum device 3 includes two sets of supporting wheel assemblies and one set of retaining wheel assemblies. The two sets of supporting wheel assemblies are respectively arranged on both sides of the load-bearing roller ring 101 for vertically supporting the drum 1, and the retaining wheel assembly is arranged on one side of the load-bearing roller ring 101 for laterally supporting the drum 1. Manholes are respectively opened at both ends of the drum 1, and the manholes are closed by openable manhole covers 102. To improve the wear resistance of the drum 1, high wear-resistant porcelain chips are pasted on the inner wall of the drum in this embodiment.

[0034] The drum driving device 7 includes a large gear welded to the middle of the drum 1 and a driving motor fixedly installed on the frame 8. The output end of the driving motor is meshed with the large gear on the drum 1 through a gear, so as to drive the drum 1 to rotate.

[0035] The feeding head 5 includes a drum sealing cover, a feeding cylinder connected to the drum sealing cover, and a shaft end sealing cover of the feeding cylinder connected to the feeding cylinder. The discharging tail 4 includes a drum sealing cover, an inclined conical cylinder connected to the drum sealing cover, a shaft end sealing cover of the inclined conical cylinder connected to the inclined conical cylinder, and a discharging cylinder connected to the inclined conical cylinder. The drum sealing covers are respectively rotationally and cooperatively connected to both ends of the drum 1 through dynamic sealing mechanisms.

[0036] As Figure 1 , Figure 2 shown, the stirring and pushing rotor 2 of this embodiment includes a rotating shaft 201, mixing blades 202, pushing spiral blades 203, feeding spiral blades 204, and reverse pushing spiral blades 205. The rotating shaft 201 penetrates through the feeding head 5, the drum 1, and the discharging tail 4, and the rotating shaft 201 is offset within the drum 1. Multiple groups of mixing blades 202 are installed at intervals on the rotating shaft 201. The pushing spiral blades 203 are installed at one end of the rotating shaft 201 close to the discharging tail 4. The feeding spiral blades 204 are arranged at the front end of the feeding cylinder. The reverse pushing spiral blades 205 are arranged at the end of the inclined conical cylinder. The spiral direction of the reverse pushing spiral blades 205 is opposite to that of the pushing spiral blades 203. The main function of the pushing spiral blades 203 is to push out the mixed material, and the function of the reverse pushing spiral blades 205 is mainly to push the material back into the discharging port to prevent the material from entering the gap between the rotor shaft and the hole and leaking out.

[0037] The mixing blades 202 are detachably installed on the rotating shaft 201, and the deflection angle of the mixing blades 202 is adjustable. The mixing blades 202 on the entire shaft can be segmented to set different deflection angles to meet the requirements of different materials and mixing processes. At the same time, each mixing blade 202 and the spiral blade can be disassembled and replaced. To enhance the service life of the spiral, high wear-resistant alloys are inlaid on the outer periphery of the spiral blades of the pushing spiral blades 203, the feeding spiral blades 204, and the reverse pushing spiral blades 205.

[0038] The stirring and pushing rotor driving device 6 is used to drive the rotating shaft 201 to rotate, and the rotating direction of the rotating shaft 201 is opposite to that of the drum 1. The rotation speed of the rotating shaft 201 is greater than the rotation speed of the drum 1.

[0039] As Figure 3 , Figure 4As shown, the dynamic sealing mechanism includes conical dynamic rings 103 respectively fixed and installed at both ends of the drum 1 through angle steel rings 104. The drum sealing cover includes an end plate 901, a labyrinth sealing static conical ring 902, a conical static ring 903, a carbon-silicon-aluminum composite sealing plate 904, a spring piece 905, a socket cylinder 906, and a nylon ring 907. The outer diameter of the end plate 901 is greater than the diameter of the drum 1. The socket cylinder 906 is fixedly connected to the end plate 901 and sleeved at the port of the drum 1. The nylon ring 907 is lined on the contact surface between the socket cylinder 906 and the drum 1. The conical static ring 903 is fixed on the outer edge of the end plate 901 and inclined towards the side close to the drum 1. The inclination angles of the conical dynamic ring 103 and the conical static ring 903 are the same. The labyrinth sealing static conical ring 902 is arranged between the socket cylinder 906 and the conical static ring 903. Multiple carbon-silicon-aluminum composite sealing plates 904 and spring pieces 905 are fixed on the conical static ring 903 by screws. Multiple carbon-silicon-aluminum composite sealing plates 904 are sequentially spliced through joint ports. The spring piece 905 presses the carbon-silicon-aluminum composite sealing plates 904 and closely adheres them to the conical static ring 903 and the conical dynamic ring 103, so as to achieve the purpose of sealing.

[0040] As Figure 1 , Figure 5 shown, a dust leakage port is opened on the end plate 901 between the labyrinth sealing static conical ring 902 and the socket cylinder 906 below the drum sealing cover. A dust collection cylinder 10 is docked at the dust leakage port, and a small amount of escaped dust can be collected and cleaned regularly.

[0041] The reduction motors of the stirring and pushing rotor driving device 6 and the drum driving device 7 in this embodiment adopt a parallel shaft - helical gear reduction motor with a highly modular design, which has high mechanical efficiency, a large transmission ratio, low noise, high strength, a small volume, and a long service life. The stirring and pushing rotor driving device 6 drives the stirring and pushing rotor through a reduction motor and a pair of V-belt pulleys. The drum driving device 7 drives the drum through a reduction motor and a pair of large and small gears.

[0042] With the help of the teachings present in the foregoing specification and the related drawings, those skilled in the art to which the present invention pertains will envision many modifications and other embodiments of the present invention. Therefore, it is to be understood that the present invention is not limited to the specific embodiments disclosed, and that modifications and other embodiments are considered to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a general and descriptive sense only and not for purposes of limitation.

Claims

1. A large continuous mixer, comprising a frame (8) and a drum (1), characterized in that: It further includes a stirring and pushing rotor (2), a supporting roller device (3), a discharging machine tail (4), a feeding machine head (5), a stirring and pushing rotor driving device (6), and a roller driving device (7); The supporting roller device (3) is fixedly installed on the frame (8), and the roller (1) is inclined and placed on the supporting roller device (3); The feeding machine head (5) includes a roller sealing cover, a feeding cylinder connected to the roller sealing cover, and a feeding cylinder shaft end sealing cover connected to the feeding cylinder. The discharging machine tail (4) includes a roller sealing cover, an inclined conical cylinder connected to the roller sealing cover, an inclined conical cylinder shaft end sealing cover connected to the inclined conical cylinder, and a discharging cylinder connected to the inclined conical cylinder. The roller sealing covers are respectively rotationally and cooperatively connected to both ends of the roller (1) through dynamic sealing mechanisms; The dynamic sealing mechanism includes conical surface dynamic rings (103) respectively fixedly installed at both ends of the roller (1) through angle steel rings (104). The roller sealing cover includes an end plate (901), a labyrinth sealing static conical ring (902), a conical surface static ring (903), a carbon silicon aluminum composite sealing plate (904), a spring piece (905), a sleeved cylinder (906), and a nylon ring (907). The outer diameter of the end plate (901) is larger than the diameter of the roller (1). The sleeved cylinder (906) is fixedly connected to the end plate (901) and sleeved at the port of the roller (1). The nylon ring (907) is lined on the contact surface between the sleeved cylinder (906) and the roller (1). The conical surface static ring (903) is fixed on the outer edge of the end plate (901) and is inclined towards the side close to the roller (1). The inclination angles of the conical surface dynamic ring (103) and the conical surface static ring (903) are the same. The labyrinth sealing static conical ring (902) is arranged between the sleeved cylinder (906) and the conical surface static ring (903). Multiple carbon silicon aluminum composite sealing plates (904) and spring pieces (905) are fixed on the conical surface static ring (903) through screws. The spring piece (905) presses the carbon silicon aluminum composite sealing plate (904) and tightly adheres it to the conical surface static ring (903) and the conical surface dynamic ring (103); The stirring and pushing rotor (2) includes a rotating shaft (201), mixing paddle blades (202), and pushing screw blades (203). The rotating shaft (201) penetrates through the feeding machine head (5), the roller (1), and the discharging machine tail (4), and the rotating shaft (201) is offset inside the roller (1). Multiple groups of mixing paddle blades (202) are installed at intervals on the rotating shaft (201). The pushing screw blades (203) are installed at one end of the rotating shaft (201) close to the discharging machine tail (4); A feeding screw blade (204) and a reverse pushing screw blade (205) are also installed on the rotating shaft (201); The stirring and pushing rotor driving device (6) is used to drive the rotating shaft (201) to rotate, and the rotating direction of the rotating shaft (201) is opposite to the rotating direction of the roller (1). The rotation speed of the rotating shaft (201) is greater than the rotation speed of the roller (1).

2. The large continuous mixer according to claim 1, characterized in that: The inclined angle of the roller (1) is 5 - 12 degrees.

3. A large continuous mixer as claimed in claim 1, characterized in that: The outer wall of the drum (1) is welded with a load-bearing roller ring (101). The drum (1) is cooperated with the supporting and blocking drum device (3) through the load-bearing roller ring (101). The supporting and blocking drum device (3) includes two groups of supporting wheel assemblies and one group of blocking wheel assemblies. The two groups of supporting wheel assemblies are respectively arranged on both sides of the load-bearing roller ring (101) for vertically supporting the drum (1), and the blocking wheel assembly is arranged on one side of the load-bearing roller ring (101) for laterally supporting the drum (1).

4. A large continuous mixer according to claim 1, characterized in that: Multiple carbon silicon aluminum composite sealing plates (904) are sequentially spliced through the joint.

5. A large continuous mixer as claimed in claim 1, wherein: A dust leakage port is opened on the end plate (901) between the labyrinth seal static cone ring (902) and the socket cylinder (906) under the drum sealing cover, and a dust collecting cylinder (10) is butted at the dust leakage port.

6. A large continuous mixer as claimed in claim 1, wherein: The mixing paddle (202) is detachably installed on the rotating shaft (201), and the deflection angle of the mixing paddle (202) is adjustable.

7. A large continuous mixer as claimed in claim 1, wherein: The feeding spiral blade (204) is arranged at the front end of the feeding cylinder, and the reverse pushing spiral blade (205) is arranged at the end of the inclined conical cylinder. The spiral direction of the reverse pushing spiral blade (205) is opposite to that of the material pushing spiral blade (203).

8. The large continuous mixer according to claim 1, characterized in that: The outer peripheries of the spiral blades of the material pushing spiral blade (203), the feeding spiral blade (204) and the reverse pushing spiral blade (205) are inlaid with high wear-resistant alloys.

9. A large continuous mixer as claimed in claim 1, wherein: High wear-resistant porcelain chips are pasted on the inner wall of the drum (1).

10. A large continuous mixer as claimed in claim 1, characterized in that: Manholes are respectively opened at both ends of the drum (1), and the manholes are closed by openable manhole covers (102).

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