Dual-shaft plow mixer for homogenizing powders with large density difference

Abstract

The present invention relates to the technical field of powder engineering material mixing. Disclosed is a dual-shaft plow mixer for homogenizing powders with a large density difference. The dual-shaft plow mixer comprises an electric-motor driving device, an omega-shaped mixing drum, a stirrer, an air pressure balance device and a discharge device, wherein the electric-motor driving device is mounted on a fixed bracket of a sealing head on one side of the omega-shaped mixing drum, and two output shafts of the electric-motor driving device are connected to a main shaft of the stirrer by means of couplings or keys, respectively; the stirrer is mounted in the omega-shaped mixing drum; the air pressure balance device is mounted at an air pressure balance port of a cover plate of the omega-shaped mixing drum; the discharge device is mounted at the bottom of the omega-shaped mixing drum; and each U-shaped bottom of the omega-shaped mixing drum is provided with a large hatch, the opening and closing of each hatch is controlled by means of two electric or pneumatic push rods, and each hatch is configured for discharge. A plow mixing mode is used, and there is no need for a high throwing and flipping space, such that the material loading rate is greatly increased, and the problem of uniform mixing being difficult due to the fact that lightweight components in the powders with a large density difference float is solved.

Description

A twin-shaft tillage mixer for homogenizing powders with large density differences Technical Field

[0001] The present invention relates to the field of powder mixing technology, in particular to a double-shaft tillage mixer for homogenizing powders with large density differences, particularly suitable for powders with a maximum density difference of more than 2.5 g / cm 3 Homogenization of powders. Background Art

[0002] Powder mixing is an indispensable production process in modern industry, widely used in nearly every industry, including chemicals, metallurgy, building materials, pharmaceuticals, light industry, feed, and ceramics. With the advancement of technology, mixing processes have been continuously innovated and improved in recent years. Mixers have evolved from an early stage represented by ribbon screw mixers, planetary twin-screw conical mixers, and plowshare mixers, to a second stage dominated by twin-shaft paddle mixers, ribbon mixers, combined ribbon and paddle mixers, twin-screw mixers, and vertical cantilever rotary mixers, particularly the new twin-shaft paddle mixer, to a third stage represented by the zero-gravity mixer, which has developed to date. The horizontal ribbon mixer has a fast mixing speed, short mixing time and good mixing quality. This mixer can not only mix materials with good scattering properties, but also mix materials with poor scattering properties and high adhesion. The horizontal twin-shaft paddle mixer has a fast mixing speed (45-60s), good mixing uniformity and allows for the addition of large amounts of viscous materials. The advantages of the conical planetary mixer are strong mixing action, short mixing time, rapid and complete mixing, and small amount of residue. The V-type mixer has a short mixing time and can effectively prevent agglomeration. It is mostly used for dilution and premixing of additives. The horizontal zero-gravity mixer has a fast mixing speed, high efficiency, short discharging time and clean unloading.

[0003] The mixer loading rate has a great influence on the uniformity and quality of the powder. Too high or too low a mixer loading rate will have a negative impact on the powder mixing uniformity. Therefore, appropriate mixer loading is conducive to ensuring the mixing uniformity of the powder. The loading rate of most mixers is 40% to 60%.

[0004] The innovation and development of mixers have better met the needs of production development. However, with the in-depth development of social economy and technology, the types of mixed raw materials are becoming more and more extensive. The homogenization and mixing of large density difference, trace and ultra-light powders are becoming more and more common. For example, in underground mine tailings filling cementing materials and heavy metal solidification and stabilization materials, some minerals have a density of only 2.3g / cm 3 , and some mineral components are as high as 5.0-6.0 g / cm 3 , the maximum density difference is greater than 3.0g / cm 3, the existing powder mixing equipment and technology can hardly meet the homogenization mixing requirements of similar powders, and the development of new equipment is an urgent need for actual production.

[0005] In general, the current problems of powder mixing equipment are:

[0006] (1) Ultra-light and ultra-fine powders are easy to float and difficult to mix into the main powder;

[0007] (2) It is difficult to achieve fine mixing at the microscopic level. The uniformity of the mixed powder is poor, the material composition and particle size are uneven, and the product performance varies greatly.

[0008] (3) The loading coefficient is low, the mixing efficiency is not high, and the equipment production capacity cannot be normally exerted.

[0009] Summary of the Invention

[0010] The object of the present invention is to provide a twin-shaft tillage mixer for homogenizing powders with large density differences, so as to solve the problem in the background art mentioned above that light components in powders with large density differences float and thus are difficult to mix uniformly.

[0011] To achieve the above object, the present invention provides the following technical solutions: a double-shaft tillage mixer for homogenizing powders with large density differences, which is used for mixing different mineral components with a maximum density difference greater than 2.5 g / cm 3The powder homogenization process includes a motor drive device, an ω-shaped mixing drum, an agitator, an air pressure balancing device and a discharge device. The motor drive device is installed on a fixed bracket of a head on one side of the ω-shaped mixing drum, and the two output shafts of the motor drive device are respectively connected to the main shaft of the agitator through couplings or key pins; the agitator is installed in the ω-shaped mixing drum; the air pressure balancing device is installed on the air pressure balancing port of the cover plate of the ω-shaped mixing drum; the discharge device is installed at the bottom of the ω-shaped mixing drum, and a large bin door is respectively opened on the U-shaped bottom of the ω-shaped mixing drum, and the opening and closing of each bin door is controlled by two electric or pneumatic push rods. The agitator consists of a main shaft, a support shaft, an inner spiral belt, an inner spiral belt lifting plate, an outer spiral belt, an outer spiral belt lifting plate and a main lifting plate; the diameter of the support shaft D3 is ≤ 1 / 2 of the main shaft diameter D4; the main shaft is a thick-walled seamless steel pipe, one end of which is fixed in the support bearing at the head mounting hole, and the other end is connected to the motor drive device through a coupling or a keyway; a support shaft is welded on the main shaft, and the support shaft is a thick-walled round tube or round steel with a shaft diameter that is half of the main shaft diameter. The support shafts welded at both ends are 2-3 mm away from the head, and adjacent support shafts are perpendicular to each other, and each support shaft is symmetrical about the main shaft; the inner spiral belt is a spiral metal strip steel, which is divided into left-hand spiral The inner spiral ribbon is welded to the support shaft; the inner spiral ribbon is perpendicular to the inner spiral ribbon and welded along the edge of the inner spiral ribbon. The metal strip steel of the same material as the inner spiral ribbon is welded; the outer spiral ribbon is a spiral metal strip steel, divided into a left spiral and a right spiral, welded to the support shaft outside the inner spiral ribbon; the outer spiral ribbon is perpendicular to the outer spiral ribbon, welded along the edge of the outer spiral ribbon and made of the same material as the outer spiral ribbon; the main copying plate is a metal plate with a width of 80-300mm welded to the top of the support shaft on the outer periphery of the outer spiral ribbon, and its length is ≤4-6mm of the internal length of the mixing barrel; the outer diameter D2 of the inner spiral ribbon is 1 / 2 to 1 / 3 of the outer diameter D1 of the outer spiral ribbon.

[0012] Preferably, the motor drive device consists of a motor, a reducer and a gear transmission mechanism. The motor is connected to the reducer through a motor shaft head spline to form an integrated device. The reducer is engaged with a passive gear on the left and right through the output end driving gear. The passive gears are engaged with a shaft gear at the far end from the driving gear. The shaft gears are connected to the main shaft of the agitator through a coupling or a keyway to form a motor drive device.

[0013] Preferably, the ω-shaped mixing cylinder consists of a cylinder, a cover plate, a head and a fixed bracket. The cylinder is made of two identical U-shaped cylinders welded symmetrically along one side, and a connecting plate with a mounting hole is horizontally welded on the upper edge; the two ends of the cylinder are connected to the head through flanges. The head is ω-shaped and is provided with mounting holes corresponding to the flange holes on the cylinder. The heads at both ends have symmetrical openings in the center and corresponding fixed brackets are welded for installing the main shaft bearings and sealing devices. The semi-closed mixing cylinder formed by the head is connected to the cover plate through a flange, and there is a feed port on the cover plate.

[0014] Preferably, the air pressure balancing device consists of a dust collector and a valve, one end of the valve is mounted on the air pressure balancing port of the cover plate, and the dust collector is mounted on the other end of the valve.

[0015] Preferably, the unloading device consists of a bin door, an opening and closing actuator, a sealing ring, a bin door plate and a pad. The bin door is 2-3 mm smaller than the discharge port and has the same thickness as the wall thickness of the cylinder. A metal sealing ring is welded around the bottom of the bin door, and an 8-12 mm thick pad is provided between the sealing ring and the bin door. The outer edge of the pad is flush with the bin door. Half of the sealing ring is welded to the bin door, and the other half extends out to form a step with the bin door. A 3-5 mm thick rubber strip is glued to the step.

[0016] Preferably, the sealing ring width W1 is ≥40 mm, and the arc-shaped sealing ring with a welding width of 1 / 4 W1 and a height of 3-9 mm is formed at a distance of 1 / 2 W1 from the center of the outer side of the opening.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) This twin-shaft tillage mixer is used for homogenizing powders with large density differences. The shovel on the outer edge of the agitator shovels the high-density material settled at the bottom to the upper part of the material, covering the low-density material floating on the upper part, solving the problem that the low-density material cannot be integrated into the main powder.

[0019] (2) This is a twin-shaft tillage mixer used for homogenizing powders with large density differences. The lifting plate on the outer spiral belt picks up the middle main powder from the bottom and sprinkles it on the upper part of the material in a spiral shape, which not only covers the low-density material on the upper part, but also promotes the horizontal movement and improves the mixing accuracy.

[0020] (3) This twin-shaft tillage mixer is used for homogenizing powders with large density differences. The inner spiral ribbon lifter flips the material at the bottom of the inner spiral ribbon to the upper part of the inner spiral ribbon, strengthening the upward and downward convection of the material, reducing the problem of weight segregation locally, and is beneficial to fine mixing at the micro level.

[0021] (4) This twin-shaft tillage mixer is used for homogenizing powders with large density differences. Because it is a tillage mixing machine, it does not require a large space for throwing and turning, which greatly improves the material loading rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of a motor drive device according to the present invention;

[0023] FIG2 is a schematic structural diagram of an ω-type mixing cylinder according to the present invention;

[0024] FIG3 is a schematic structural diagram of an agitator according to the present invention;

[0025] FIG4 is a schematic structural diagram of an air pressure balancing device according to the present invention;

[0026] Figure 5 is a schematic structural diagram of the unloading device of the present invention;

[0027] FIG6 is a schematic diagram of the overall structure of the present invention.

[0028] In the figure: 1. Motor drive device; 101. Motor; 102. Reducer; 103. Gear transmission mechanism; 2. ω-shaped mixing barrel; 201. Barrel; 202. Cover plate; 203. Head; 204. Fixed bracket; 205. Feed inlet; 206. Electric or pneumatic push rod; 3. Agitator; 301. Main shaft; 302. Support shaft; 303. Inner spiral ribbon; 304. Inner spiral ribbon copy plate; 305. Outer spiral ribbon; 306. Outer spiral ribbon copy plate; 307. Main copy plate; 4. Air pressure balancing device; 401. Dust collector; 402. Valve; 5. Discharging device; 501. Bin door; 502. Opening and closing actuator; 503. Sealing ring; 504. Bin door plate; 505. Pad. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0030] As shown in Figure 6, a double-shaft tillage mixer for homogenizing powders with large density differences in this embodiment includes a motor drive device 1, an ω-shaped mixing drum 2, an agitator 3, an air pressure balance device 4 and a discharge device 5. The motor drive device 1 is installed on a fixed bracket 204 of a head 203 on one side of the ω-shaped mixing drum 2, and the two output shafts of the motor drive device 1 are respectively connected to the main shaft 301 of the agitator 3 through a coupling or a key pin; the ω-shaped mixing drum 2 is a container for mixing and stirring and a bracket for installing related components and facilities. The main shaft 301 mounting holes are symmetrically opened on the heads 203 on both sides of the drum 201, and the shafts are respectively Bearings, bearing seats, seals, etc. are used to install the agitator 3. The cover plate 202 is provided with a feed port 205, an air pressure balance port and a window; the agitator 3 is installed in the ω-shaped mixing drum 2, and the main shaft 301 has a fixed support at one end and a floating support at the other end. The floating support is connected to the motor drive device 1, and the two agitators 3 rotate synchronously in opposite directions for stirring; the air pressure balance device 4 is installed on the air pressure balance port of the cover plate 202 of the ω-shaped mixing drum 2; the unloading device 5 is installed at the bottom of the ω-shaped mixing drum 2, and the U-shaped bottom of the ω-shaped mixing drum 2 is respectively provided with a large warehouse door 501, and the opening and closing of each warehouse door 501 is controlled by two electric or pneumatic push rods 206.

[0031] As shown in Figure 1, the motor drive device 1 in this embodiment consists of a motor 101, a reducer 102 and a gear transmission mechanism 103. The motor 101 is preferably a vertical 6-level or 8-level three-phase asynchronous variable frequency motor to ensure that the motor has sufficient torque, reduce the speed ratio, and is beneficial to protecting the driving wheel. The motor 101 and the reducer 102 can be separated and connected by a coupling or a key. Preferably, the motor 101 and the reducer 102 are connected in an integrated manner. The output shaft of the reducer 102 is connected to the driving wheel of the gear transmission mechanism 103 through a key pin. The reducer 102 is fixed to the corresponding station of the gear transmission mechanism 103 with bolts. The gear transmission mechanism 103 has a driven wheel group on the left and right. Through the corresponding gear transmission conversion, the gear transmission mechanism 103 has two output shafts at the same horizontal height, a certain distance apart, the same torque, opposite rotation direction, and synchronization. The gear transmission mechanism 103 is fixed to the mounting bracket welded on the head 203 by bolts.

[0032] As shown in FIG2 , the ω-shaped mixing cylinder (2) in this embodiment is composed of a cylinder (201), a cover plate (202), a head (203) and a fixed bracket (204). The bottom of the cylinder 201 is formed by welding two U-shaped grooves of the same diameter along the outside to form an ω-shaped groove. Two vertical sections of the cylinder wall are welded on both sides of the ω-shaped groove. A skid-mounted connecting plate is welded on the outer edge. The connecting plate is 40 to 80 mm wide and 6 to 16 mm thick. A discharge hopper is opened at the bottom of the two U-shaped grooves. Both ends of the discharge hopper are connected to the ω-shaped mixing cylinder. 2 corresponds to the end face 30 to 80 mm, and the two sides are 50 to 100 mm from the top of the U-shaped groove; the two ends of the cylinder 201 are connected to the head 203 through flanges. The head 203 is ω-shaped and has mounting holes corresponding to the flange holes on the cylinder 201. The heads 203 at both ends have symmetrical openings and are welded with corresponding fixing brackets 204 for installing the main shaft bearings and sealing devices. The semi-enclosed mixing cylinder composed of the head 203 is connected to the cover plate 202 through flanges. The cover plate 202 has a feed port 205.

[0033] As shown in Figure 3, the agitator 3 in the present embodiment is composed of a main shaft 301, a support shaft 302, an inner spiral ribbon 303, an inner spiral ribbon copying plate 304, an outer spiral ribbon 305, an outer spiral ribbon copying plate 306 and a main copying plate 307. The agitator 3 is installed in the ω-shaped mixing drum 2, and is connected to the corresponding mounting bearings at both ends of the main shaft 301. The two ends are sealed with a machine seal or a packing seal to prevent the mounting hole from leaking powder. The main shaft 301 is a thick-walled seamless steel pipe made of ordinary carbon steel or stainless steel. The support shaft 302 is welded on the main shaft 301, and the support shaft 302 welded at both ends is 2032 to 3m away from the end caps. m, a support shaft 302 is welded at each 90° rotation of the spiral ribbon, and the support shaft 302 may have two short axes symmetrically welded about the main shaft 301. Preferably, a single long axis perforated main shaft 301 is symmetrically welded, and adjacent support shafts 302 are perpendicular to each other, and the length L1 of the support shaft 302 is equal to the diameter D-80 to 200 mm of the U-shaped groove, and the diameter D3 of the support shaft 302 is ≤ 1 / 2 of the diameter D4 of the main shaft 301; the spiral ribbon is a double-headed double spiral ribbon, i.e., an inner spiral ribbon 303 and an outer spiral ribbon 305, and the outer diameter D1 of the outer spiral ribbon 305 is equal to the length L1 of the support shaft 302 - 60 to 160 mm, and the outer diameter D1 of the inner spiral ribbon 303 is equal to the outer diameter D4 of the inner spiral ribbon 303. The diameter D2 is 1 / 2 to 1 / 3 of the outer diameter D1 of the outer spiral belt 305. The width of the outer spiral belt 305 is 40 to 120 mm. The inner spiral belt 303 and the outer spiral belt 305 are reverse threads. The pitch of the inner spiral belt 303 and the outer spiral belt 305 are equal. In order to ensure that the material conveying capacity of the inner and outer spiral belts is equal, the width of the inner spiral belt 303 is 2 to 3 times the width of the outer spiral belt 305. The inner spiral belt copy plate 304 is a metal strip steel that is perpendicular to the inner spiral belt 303 and welded along the outer edge of the inner spiral belt 303. It is made of the same material as the spiral belt, has a width of 20 to 100 mm, a thickness of 3 to 12 mm, and is placed on the inner spiral belt 303. During rotation, the material with higher density is stirred from the bottom to the top, reducing the component segregation caused by density difference; the outer spiral ribbon lifting plate 306 is a metal strip steel vertically welded along the outer edge of the outer spiral ribbon 305, and is made of the same material as the spiral ribbon, with a width of 20 to 100 mm and a thickness of 3 to 12 mm. When the outer spiral ribbon 305 rotates, the material with higher density is stirred from the bottom to the top, and together with the inner spiral ribbon lifting plate 304, a multi-layer stirring is formed, so that the light component falls and the heavy component covers the light component, reducing the component segregation caused by density difference. The rotation of the double-layer spiral ribbon strengthens the convection, diffusion, shear and seepage mixing effects of the powder;The main scraper plate 307 is welded horizontally to the support shaft 302, closely attached to the outer edge of the outer spiral ribbon 305. It is a horizontal, arc-shaped steel plate with a straight section, 3-12 mm thick. Its total length L2 is equal to the inner diameter L0 of the ω-shaped mixing drum 2 (2-4 mm), and its width w is equal to the radius D / 2 of the U-shaped groove (40-100 mm). The horizontal section is 20-60 mm long, and the arc section has a projected length of 20-60 mm. The horizontal section is welded to the support shaft 302, and the arc radius is equal to the radius D / 2 of the U-shaped groove (1-2 mm). As the agitator 3 rotates, the main scraper plate 307 scoops the heavy components from the bottom of the U-shaped groove along the wall of the ω-shaped mixing drum 2 to the top of the material, where they are dispersed toward the center. The outer spiral ribbon scraper plate 306 also scoops the material from the bottom toward the center. Due to the different radii and scraper linear speeds, the dispersion distances vary, creating a three-dimensional, multi-level mixing process.

[0034] As shown in Figure 4, the air pressure balancing device 4 in this embodiment is composed of a dust collector 401 and a valve 402. One end of the valve 402 is installed on the air pressure balancing port of the cover plate 202, and the dust collector 401 is installed at the other end of the valve 402. The dust collector 401 is a pulse bag or filter cartridge dust collector, preferably with natural exhaust and a pulse compressed air purge system. When the mixer is fed, the valve 402 is opened, and compressed gas is generated and discharged from the dust collector 401. When the feeding is completed, the valve 402 is closed; when unloading, the valve 402 is opened to maintain the pressure balance of the mixer.

[0035] As shown in Figure 5, the unloading device 5 in this embodiment consists of a bin door 501, an opening and closing actuator 502, a sealing ring 503, a bin door plate 504 and a pad 505. The two U-shaped bottoms of the ω-shaped mixing drum 2 are each equipped with a bin door 501. The bin door 501 is 2 to 3 mm smaller than the discharge port and has the same thickness as the wall thickness of the drum 201. A metal sealing ring 503 is welded around the bottom of the bin door 501. There is an 8 to 12 mm thick pad 5 between the sealing ring 503 and the bin door 501. 05. The outer edge of the pad 505 is flush with the warehouse door 501. Half of the sealing ring 503 is welded to the warehouse door 501, and the other half extends out to form a step with the warehouse door 501. A rubber strip 3 to 5 mm thick is glued on the step. The width W1 of the sealing ring 503 is ≥ 40 mm. The outer center of the warehouse opening is 1 / 2W1 away from the warehouse opening, and an arc-shaped sealing ring with a welding width of 1 / 4W1 and a height of 3 to 9 mm is welded. The opening and closing of each warehouse door 501 is performed by two electric or pneumatic push rods 206.

[0036] The present invention has been used in the production of underground mine tailings filling cementitious materials with an annual output of 100,000 tons. The maximum density difference among the mineral components is greater than 3.5g / cm 3 Experimental studies have shown that the maximum density difference of different mineral components used in this invention is greater than 3.5g / cm 3The homogenization treatment of the powder overcomes the problem of difficulty in uniform mixing due to the floating of light components in powders with large density differences. After sampling and analysis, the material components and particle size distribution after homogenization treatment of the present invention are very uniform, ensuring the stability of product performance and achieving unexpected technical effects.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A double-shaft tillage type mixer for homogenizing powders with a large density difference, which is used for homogenizing powders with a maximum density difference between different mineral components greater than 2.5 g / cm 3 It includes a motor drive device (1), a ω-shaped mixing cylinder (2), a stirrer (3), a pneumatic balance device (4) and a discharging device (5), and is characterized in that: The motor drive device (1) is installed on the fixed bracket (204) of one end head (203) of the ω-shaped mixing cylinder (2). The two output shafts of the motor drive device (1) are respectively connected to the main shaft (301) of the stirrer (3) through couplings or key pins. The stirrer (3) is installed inside the ω-shaped mixing cylinder (2). The air pressure balance device (4) is installed on the air pressure balance port of the cover plate (202) of the ω-shaped mixing cylinder (2). The discharging device (5) is installed at the bottom of the ω-shaped mixing cylinder (2). A large bin door (501) is respectively opened on the U-shaped bottom of the ω-shaped mixing cylinder (2), and the opening and closing of each bin door (501) are controlled by two electric or pneumatic push rods (206). The stirrer (3) is composed of a main shaft (301), a support shaft (302), an inner spiral ribbon (303), an inner spiral ribbon scraper (304), an outer spiral ribbon (305), an outer spiral ribbon scraper (306) and a main scraper (307). The diameter D3 of the support shaft (302) is less than or equal to 1 / 2 of the diameter D4 of the main shaft (301). The main shaft (301) is a thick-walled seamless steel pipe, one end of which is fixedly installed in the support bearing at the installation hole of the end head (203), and the other end is connected to the motor drive device (1) through a coupling or a keyway. The support shaft (302) is welded on the main shaft (301). The support shaft (302) is a thick-walled round pipe or round steel with a shaft diameter that is one-half of the shaft diameter of the main shaft (301). The support shafts (302) welded at both ends are 2 - 3 mm away from the end head (203). The adjacent support shafts (302) are perpendicular to each other, and each support shaft (302) is symmetric about the main shaft (301). The inner spiral ribbon (303) is a spiral-shaped metal strip, which is divided into left-handed spiral and right-handed spiral and is welded on the support shaft (302). The inner spiral ribbon scraper (304) is a metal strip perpendicular to the inner spiral ribbon (303) and welded along the edge of the inner spiral ribbon (303) with the same material as the inner spiral ribbon (303). The outer spiral ribbon (305) is a spiral-shaped metal strip, which is divided into left-handed spiral and right-handed spiral and is welded on the support shaft (302) outside the inner spiral ribbon (303). The outer spiral ribbon scraper (306) is a metal strip perpendicular to the outer spiral ribbon (305) and welded along the edge of the outer spiral ribbon (305) with the same material as the outer spiral ribbon (305). The main scraper (307) is outside the outer spiral ribbon (305), and is a metal plate with a width of 80 - 300 mm welded on the top of the support shaft (302), and the length is less than or equal to 4 - 6 mm of the internal length of the mixing cylinder. The outer diameter D2 of the inner spiral ribbon (303) is 1 / 2 - 1 / 3 of the outer diameter D1 of the outer spiral ribbon (305).

2. The biaxial tillage type mixer for homogenizing powders with large density difference according to claim 1, characterized in that: The motor drive device (1) consists of a motor (101), a speed reducer (102) and a gear transmission mechanism (103). The motor (101) is connected to the speed reducer (102) through the spline of the motor shaft head to form an integrated device. The speed reducer (102) meshes with a passive gear on each of the left and right sides through the driving gear at the output end. The distal ends of the passive gears away from the driving gear are respectively meshed with a shaft gear. The shaft gear is connected to the main shaft (301) of the stirrer (3) through a coupling or a keyway, thus constituting the motor drive device (1).

3. The biaxial tillage type mixer for homogenizing powders with a large density difference according to claim 1, characterized in that: The ω-shaped mixing cylinder (2) consists of a cylinder body (201), a cover plate (202), a head (203) and a fixing bracket (204). The cylinder body (201) is formed by symmetrically welding two identical U-shaped cylinders along one side, and a connecting plate with mounting holes is horizontally welded on the upper edge. The two ends of the cylinder body (201) are connected to the head (203) through flanges. The head (203) is ω-shaped and is provided with mounting holes corresponding to the flange holes on the cylinder body (201). The centers of the two ends of the head (203) are symmetrically drilled, and the corresponding fixing brackets (204) are welded for installing the main shaft bearings and the sealing device. The semi-closed mixing cylinder formed by the head (203) is connected to the cover plate (202) through a flange, and there is a feed port (205) on the cover plate (202).

4. A double-shaft ploughing type mixer for homogenizing powders with a large density difference according to claim 1, characterized in that: The main baffle (307) is outside the outer spiral belt (305), and is a metal plate with a width of 80 - 300 mm welded to the top of the support shaft (302), and the length ≤ 4 - 6 mm of the internal length of the mixing cylinder.

5. A double-shaft rotary tillage type mixer for homogenizing powders with a large density difference according to claim 1, characterized in that: The air pressure balance device (4) consists of a dust collector (401) and a valve (402). One end of the valve (402) is installed on the air pressure balance port of the cover plate (202), and the dust collector (401) is installed at the other end of the valve (402).

6. A double-shaft rotary tillage type mixer for homogenizing powders with a large density difference according to claim 1, characterized in that: The discharging device (5) consists of a hatch door (501), an opening and closing actuator (502), a sealing ring (503), a hatch door plate (504) and a backing plate (505). The hatch door (501) is 2 - 3 mm smaller than the discharging opening, and has the same thickness as the wall thickness of the cylinder body (201). A metal sealing ring (503) is welded around the bottom of the hatch door (501). There is a backing plate (505) with a thickness of 8 - 12 mm between the sealing ring (503) and the hatch door (501). The outer edge of the backing plate (505) is flush with the hatch door (501). Half of the sealing ring (503) is welded to the hatch door (501), and the other half extends out to form a step with the hatch door (501). A rubber strip with a thickness of 3 - 5 mm is glued on the step.

7. A double-shaft tillage type mixer for homogenizing powders with a large density difference according to claim 6, characterized in that: The width W1 of the sealing ring (503) ≥ 40 mm, and an arc-shaped sealing ring with a width of 1 / 4W1 and a height of 3 - 9 mm is welded at a distance of 1 / 2W1 from the center of the outside of the hatch opening.

Images