阅读说明：本技术 一种基于螺旋输送的颗粒分离装置 (Particle separation device based on spiral conveying ) 是由 赵云华 周明涵 王成静 庄健崇 段总样 王勤勇 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种基于螺旋输送的颗粒分离装置,包括物料入口、螺旋输送器以及物料出口收集装置,所述螺旋输送器包括管壁、蛟龙叶片、内轴管,所述内轴管分为三段,第一段为直径较小的实心轴,靠近物料入口,与电机相接提供旋转动力,第二段为中空部分,去除内轴管使大颗粒有足够空间下落,第三段为大颗粒收集装置的薄壁管道；所述的蛟龙叶片分为与内轴管对应的三段,第一段与实心轴相接,叶片较宽,第二段叶片逐渐变窄,给予大颗粒足够的掉落空间,第三部分与大颗粒收集装置的薄壁管道相接,叶片最窄。本装置实现了大小颗粒的分离与分别收集,装置具有连续运行、自动化程度高、单机处理能力大等优点,具有重要的工程应用价值。(The invention discloses a particle separation device based on spiral conveying, which comprises a material inlet, a spiral conveyor and a material outlet collection device, wherein the spiral conveyor comprises a pipe wall, a flood dragon blade and an inner shaft pipe, the inner shaft pipe is divided into three sections, the first section is a solid shaft with a smaller diameter, is close to the material inlet and is connected with a motor to provide rotary power, the second section is a hollow part, the inner shaft pipe is removed to enable large particles to have enough space to fall, and the third section is a thin-wall pipeline of the large particle collection device; the flood dragon blade divide into the three-section that corresponds with interior axle tube, first section meets with solid axle, and the blade is wider, and the second section blade narrows down gradually, gives the sufficient space that drops of large granule, and the third part meets with the thin wall tube of large granule collection device, and the blade is narrowest. The device realizes separation and respective collection of large and small particles, has the advantages of continuous operation, high automation degree, large single machine processing capacity and the like, and has important engineering application value.)

1. A particle separation device based on spiral conveying comprises a material inlet, a spiral conveyor and a material outlet collection device, wherein the spiral conveyor comprises a pipe wall, a dragon blade and an inner shaft pipe, and is characterized in that,

the inner shaft pipe is divided into three sections, the first section is a solid shaft with a smaller diameter, is arranged close to the material inlet and is connected with the motor to provide rotating power, the second section is a hollow part, the inner shaft pipe is removed to enable large particles in the material to have enough space to fall, and the third section is a thin-wall pipeline of the large particle collecting device;

the flood dragon blade divide into the three-section that corresponds with interior axle tube, first section meets with solid axle, and the blade is wider, and the second section blade narrows down gradually, gives the sufficient space that drops of large granule, and the third part meets with the thin wall tube of large granule collection device, and the blade is narrowest.

2. The particle separating device based on spiral conveying of claim 1, wherein the material outlet collecting device comprises a large particle collecting device and a small particle collecting device, the large particle collecting device is a section of additionally-installed thin-walled pipeline, and large particles falling from a central area can fall into the large particle collecting device under the action of gravity; the small particle collecting device is a bucket-shaped material outlet additionally arranged at the tail part of the screw conveyor.

3. A particle separating apparatus based on screw conveyor according to claim 1 or 2, characterized in that the inner diameter of the screw conveyor is in the range of 630mm-1000mm, and the diameter of the first section of the inner tube shaft is in the range of 168mm-267 mm.

4. The particle separating device based on the screw conveyor is characterized in that the fixed screw pitch of the screw conveyor ranges from 450mm to 715mm, and the thickness of the screw conveyor blade ranges from 2mm to 5 mm.

5. The device of claim 1, wherein the auger has an overall length determined by the number of auger blades, an overall length of 5 x turns/7 in the length of the auger diameter, and a wall thickness in the range of 2mm to 5 mm.

6. A particle separation unit based on screw conveyor according to claim 1, characterized in that the rotation speed of the screw conveyor is 60-140 rpm.

7. A particle separation unit based on screw transport according to claim 1, characterized in that the thin-walled tube has an inner diameter of 225mm-260 mm.

8. A particle separating apparatus based on screw conveying according to claim 1, characterized in that the particle size ratio of large particles to small particles in the separated material is more than 5: 1.

9. a particle separation method based on spiral conveying, which is characterized by adopting the particle separation device of any one of claims 1-7, and comprises the following steps: starting equipment, allowing materials to be separated to enter a spiral conveying pipe from a material inlet, dividing the spiral conveying in the spiral conveying pipe into three sections from top to bottom, connecting a flood dragon blade and an inner shaft pipe with a smaller diameter together in a first stage, allowing the materials with different particle sizes to be separated in a rotating manner due to high-speed rotation of the spiral conveying, allowing large particles to gather in a central region and small particles to be distributed in a pipe wall region, allowing the materials to reach a certain stable state, allowing the materials to enter a second stage, removing the inner shaft pipe in the second stage, further reducing the width of the flood dragon blade, allowing the middle of the flood dragon blade to be in a hollow state, allowing the large particles to fall from the middle, allowing the small particles to continue to rotate along with the flood dragon blade, achieving an effective separation effect, and finally allowing the materials to enter a third stage, arranging a thin-wall pipeline for collecting the large particles in the center of a tail pipeline, further reducing the width of the flood dragon blade and connecting the thin-wall pipeline, the large granule of central zone falls into the thin-walled pipeline under the action of gravity to leave screw conveyor separator through this pipeline, set up the material export of collecting the small granule at the outer wall of screw conveyor afterbody, the small granule receives "annular brazil fruit effect" to influence, and the gathering is at outer pipe wall, and under the effect of centrifugal force, the small granule will leave screw conveyor separator through the material export that sets up, thereby has realized the separation of big small granule and has collected respectively.

Technical Field

The invention belongs to the technical field of spiral separation, and particularly relates to a particle separation device based on spiral conveying.

Background

The spiral conveying device is widely applied to various departments of national economy such as the grain industry, the building material industry, the chemical industry, the mechanical manufacturing industry, the transportation industry and the like. The spiral conveying device is mainly used for conveying various powdery, granular and small-block materials, and the conveyed bulk materials comprise grain products such as grains, beans and flour, building materials such as cement, clay and sand, chemicals such as salts, alkalis and chemical fertilizers, and bulk goods such as coal, coke and ores. In addition to conveying bulk materials, screw conveyors may also be used to convey various pieces. The spiral conveying device can complete mixing, stirring, cooling and other operations while conveying materials.

The spiral separation technique is a method for separating particles by rotating at a high speed and generating different centrifugal forces for the particles with different properties. The spiral separation has the advantages of continuous operation, high automation degree, large single machine processing capacity, strong adaptability to materials and the like. At present, spiral separation technology is mostly applied to solid-liquid separation, gas-liquid separation, oil-water separation and the like, the application in the solid-solid separation is not much, and the requirements for separation of cement powder and quartz sand in engineering are not rare. Therefore, it is very urgent to develop a separation method based on a screw conveyor, which can be widely applied to various solid particles and is easy to be practically applied.

A phenomenon called "loop brazil effect" also occurs during the actual study of the separation method based on the screw conveyor. The separation of particles of different sizes caused by vertical mechanical vibration is a common particle stratification phenomenon, in which generally larger particles move to the upper part of the bed and smaller particles move to the lower part of the bed during vibration, and this stratification phenomenon is called "Brazil effect". The 'annular Brazil effect' is a 'Brazil' separation structure that large particles are distributed on the upper layer and small particles are distributed on the bottom layer in the circular area of the rotary motion device, and the large particles are all distributed in the area close to the circle center.

Disclosure of Invention

Aiming at the defects of the prior art, the particle separating device based on spiral conveying is provided, and is suitable for separating solid small particles such as cement powder, quartz sand and the like.

In order to achieve the purpose, the invention adopts the technical scheme that:

a particle separation device based on spiral conveying comprises a material inlet, a spiral conveyor and a material outlet collection device, wherein the spiral conveyor comprises a pipe wall, a dragon blade and an inner shaft pipe, the inner shaft pipe is divided into three sections, the first section is a solid shaft with a smaller diameter and is close to the material inlet and serves as a part which is connected with a motor and provides rotary power, the second section is a hollow part, the inner shaft pipe is removed to enable large particles to have enough space to fall, and the third section is a thin-wall pipeline of the large particle collection device; the flood dragon blade divide into the three-section that corresponds with interior axle tube, first section meets with solid axle, and the blade is wider, and the second section blade narrows down gradually, gives the sufficient space that drops of large granule, and the third part meets with the thin wall tube of large granule collection device, and the blade is narrowest.

Further, the material outlet collecting device comprises a large particle collecting device and a small particle collecting device, the large particle collecting device is a section of additionally-installed thin-wall pipeline, and large particles falling from the central area can fall into the large particle collecting device under the action of gravity; the small particle collecting device is a bucket-shaped material outlet additionally arranged at the tail part of the screw conveyor.

Further, the inner diameter and the outer diameter of the screw conveyer range from 630mm to 1000mm, and the diameter of the first section of the inner pipe shaft ranges from 168mm to 267 mm.

Further, the range of the fixed screw pitch of the screw conveyor is 450mm-715mm, and the range of the thickness of the flood dragon blades is 2mm-5 mm.

Furthermore, the total length of the screw conveyer is determined according to the number of turns of the screw conveyer blades, the total length is equal to the length of the screw conveyer in the diameter direction by 5 turns/7, and the thickness range of the pipe wall is 2mm-5 mm.

Further, the rotating speed of the screw conveyor is 60-140 rpm.

Further, the inner diameter of the thin-wall pipeline is 225mm-260 mm.

Still further, the particle size ratio of large particles to small particles in the separated material is more than 5: 1.

the invention also provides a particle separation method based on spiral conveying, which is carried out by adopting the particle separation device and comprises the following steps: starting equipment, allowing materials to be separated to enter a spiral conveying pipe from a material inlet, dividing the spiral conveying in the spiral conveying pipe into three sections from top to bottom, connecting a flood dragon blade and an inner shaft pipe with a smaller diameter together in a first stage, allowing the materials with different particle sizes to be separated in a rotating manner due to high-speed rotation of the spiral conveying, allowing large particles to gather in a central region and small particles to be distributed in a pipe wall region, allowing the materials to reach a certain stable state, allowing the materials to enter a second stage, removing the inner shaft pipe in the second stage, further reducing the width of the flood dragon blade, allowing the middle of the flood dragon blade to be in a hollow state, allowing the large particles to fall from the middle, allowing the small particles to continue to rotate along with the flood dragon blade, achieving an effective separation effect, and finally allowing the materials to enter a third stage, arranging a thin-wall pipeline for collecting the large particles in the center of a tail pipeline, further reducing the width of the flood dragon blade and connecting the thin-wall pipeline, the large granule of central zone falls into the thin-walled pipeline under the action of gravity to leave screw conveyor separator through this pipeline, set up the material export of collecting the small granule at the outer wall of screw conveyor afterbody, the small granule receives "annular brazil fruit effect" to influence, and the gathering is at outer pipe wall, and under the effect of centrifugal force, the small granule will leave screw conveyor separator through the material export that sets up, thereby has realized the separation of big small granule and has collected respectively.

Advantageous effects

The invention discloses a particle separation device based on spiral conveying, which comprises inequilateral flood dragon blades, an inner pipe intercepted in the middle and a separation and collection device for large and small particles. Through the high-speed rotation of screw conveying, the centrifugal force of different size is produced to the granule of different properties, realizes the preliminary separation of granule by the difference of atress. And in a high-speed rotating device such as a screw conveyor, a phenomenon of 'annular Brazil effect' occurs, that is, after the rotating separation, large particles are gathered in a central area, and small particles are distributed in a pipe wall area.

Based on the conditions, the invention provides that the particles are conveyed and separated in the screw conveyer for a certain distance for a certain time, the inner shaft tube is removed at the current position after the particles reach a stable separation state, the flood dragon blades are gradually narrowed until the large particles can smoothly fall down, the large particles fall into the hollow area at the center, and the small particles continue to rotate along with the flood dragon blades, so that the effective separation effect is achieved. After the separation of the large and small particles, a thin-wall pipeline for collecting the large particles is arranged at the center of the tail pipeline, and the large particles in the central area fall into the thin-wall pipeline under the action of gravity and leave the spiral conveying separation device through the thin-wall pipeline. The outer wall surface of the spiral conveying separation device is provided with a material outlet for collecting small particles, the small particles are influenced by the annular Brazil effect and are gathered on the outer pipe wall, and the small particles can leave the spiral conveying separation device through the material outlet under the action of centrifugal force, so that the separation and the respective collection of the large particles and the small particles are realized. Meanwhile, the invention carries out simulation calculation by means of domestic discrete element analysis software to obtain the horizontal distribution condition of the large and small particles at each moment, and the separation of the large and small particles can reach a stable state at a position with a tube length of several meters, thereby determining the parameters (the inner diameter of the dragon blade and the length of the head and tail inner tubes) for customizing the spiral conveying separation. The device has the advantages of continuous operation, high automation degree, large single machine processing capacity and the like, and has important engineering application value.

Drawings

FIG. 1 is a schematic diagram of a screw conveyor commonly used in engineering in the prior art;

FIG. 2 is a three-dimensional view of the structure of the screw conveyor of the present invention;

FIG. 3 is a schematic sectional view of the material inlet of the spiral conveying and separating device of the present invention;

FIG. 4 is a schematic cross-sectional view of a small particle collection apparatus of the present invention;

FIGS. 5-7 are top views of partial screw conveying separation devices of different heights;

FIG. 8 is a discrete element analysis software simulation: simulating a distribution diagram of the small particles in the device at the time of 3 s;

FIG. 9 is a discrete element analysis software simulation: simulating a distribution diagram of the small particles in the device at 19 s;

FIG. 10 shows the average distance between different sized particles in the screw conveyer tube and the axis;

FIG. 11 shows the average distance between different sized particles in the spiral duct and the axis.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The screw conveyer commonly used in the engineering can refer to fig. 1, and the invention redesigns partial position on the basis of the conventional screw conveyer. After the high-speed rotation of screw conveying, the centrifugal force of different sizes is produced to the granule of different properties, can take place the preliminary separation of granule by the difference of atress. And in a high-speed rotating device such as a screw conveyor, a phenomenon of 'annular Brazil effect' occurs, that is, after the rotating separation, large particles are gathered in a central area, and small particles are distributed in a pipe wall area.

According to the phenomenon, the inner shaft tube is redesigned, fig. 2 is a three-view of the designed spiral conveying and separating device, it can be seen that the inner shaft tube does not penetrate through the whole pipeline any more, but the inner shaft tube is divided into three sections, the first section is a solid shaft with a smaller diameter and serves as a part which is connected with a motor and provides rotary power, the second section is a hollow part, the inner shaft tube is removed, so that large particles can fall down in a sufficient space, and the third section is a thin-wall pipeline of a large particle collecting device. The flood dragon blade has carried out redesign with corresponding flood dragon blade simultaneously, the flood dragon blade be not the isodiametric, can narrow down after certain transport length, promptly the flood dragon blade also divide into corresponding three-section, first section meets with solid axle, the blade broad, second section blade narrows down gradually, gives the sufficient space that drops of large granule, the third portion meets with the thin wall pipeline of large granule collection device, the blade is narrowest. The large particle collecting device is a section of thin-wall pipeline additionally arranged, and large particles falling from the central region can fall into the large particle collecting device under the action of gravity. The small particle collecting device is shown in fig. 4, and is a bucket-shaped material outlet additionally arranged at the tail part of the spiral separating device, and small particles are influenced by the 'annular Brazil effect' and can be gathered near the tube wall and leave the device through the material outlet under the action of centrifugal force. Thereby realizing the separation and separate collection of the large and small particles in the transportation process.

The reference parameters of the spiral conveying separation device are as follows: the spiral delivery pipe who designs is the standard component, and the diameter is in the scope 630mm-1000mm, and the proportion of inner tube diameter in with is 4: 15, wall thickness, flood dragon blade thickness are 2mm-5mm, flood dragon blade fixed pitch be with in the proportion of being 5: 7, flood dragon blade number of turns can decide by oneself, and the full length is in driving 5 number of turns/7, and the wall diameter is in driving +/-2 mm. The motor capable of providing the rotating speed of 60-140rpm is used for driving, and the width degree of the flood dragon blade and the length of the solid inner shaft tube need to be determined according to a simulation calculation result.

The concrete connection is as follows: the materials enter from a material inlet on the upper left of the spiral conveying and separating device, a first section of pipeline for the materials to enter is a pipeline of a conventional spiral conveyor, namely an isoflood dragon blade is connected with a solid inner shaft tube, and the inner shaft tube is connected with a motor for providing rotary power; the second section is a pipeline without an inner shaft tube and with gradually narrowed flood dragon blades; the third section of pipeline flood dragon blade is restored to be equal diameter and is connected with the thin-wall pipeline of the large particle collecting device, and the outer wall surface of the spiral conveying and separating device is connected with the outlet of the small particle collecting device.

Fig. 1 shows a spiral conveying device commonly used in engineering applications, and the spiral conveying and separating device designed by the invention is taken as a reference.

Fig. 2 is a three-dimensional view of the designed spiral conveying and separating device, and the parts designed by the invention, namely the three-section inner shaft pipe and the flood dragon blade, and the large and small particle collecting device can be visually and accurately shown in the engineering drawing, and meanwhile, the working form of the spiral conveying and separating device can also be shown.

Fig. 3 is a schematic sectional view of a material inlet, which can accurately show the condition that the large and small particles are randomly distributed when the material enters the spiral conveying and separating device.

Fig. 4 is a schematic cross-sectional view of a small particle collection apparatus. The figure can accurately show that after the spiral conveying separation, large particles fall into a thin-wall pipeline in the central area, and small particles are influenced by the 'annular Brazil effect', are gathered on the outer pipe wall of the spiral conveying separation device under the action of centrifugal force, and leave the device from a material outlet at the position.

Fig. 5-7 are top views of partial screw conveying separation devices of different heights. The spiral conveying and separating device can accurately show that the spiral conveying and separating device is provided with the flood dragon blades with multiple diameters, after the spiral conveying and separating device is separated for a distance, the flood dragon blades gradually narrow, so that large particles have enough central regions and can fall to the thin-wall pipeline at the tail part, and the separation and collection of the large particles are realized.

Fig. 8 and 9 are domestic discrete element analysis software simulations: the distribution of small particles at the inlet of the apparatus at the simulation times of 3s and 19s, it is evident from both figures that the particle generation sites are random and that, at the completion of particle generation, the small particles are spread over the entire cross section of the apparatus. After the spiral conveying separation of the device is carried out for a certain time, the distribution of small particles in the central annular area is obviously reduced, and the small particles are gathered near the wall surface to present the annular Brazil effect and meet the expectation.

Fig. 10 and 11 show the average distance between the large and small particles and the axis in the screw conveyer, and it is obvious from the above two figures that the "ring brazil effect" produced by the screw conveyer can not completely separate the large and small particles, and after the screw separation for a while, a certain steady state can be reached, and the larger the difference of the particle diameters, the shorter the time for reaching the steady state.

After spiral separation reached steady state, the structure in the conveyer pipe changed, got rid of the interior central siphon promptly and dwindled flood dragon blade radius for the large granule that is in central zone directly falls, and the tiny particle of gathering at the pipe wall then continues along with the flood dragon blade rotation, thereby realizes the thorough separation of big small particle.