CN205253571U - Powder grading plant - Google Patents

Abstract

The utility model discloses a powder grading device, which comprises a shell, the shell has a feed port, a fine powder discharge port at the top and a coarse powder discharge port at the bottom, and a powder stirring mechanism, wherein the powder stirring mechanism includes a cylinder rotatably installed in the housing along the vertical axis, the side wall of the cylinder is spaced apart from the side wall of the housing, and a plurality of screens are respectively distributed along the axial direction and the circumferential direction. There are sub-channels, and the inner wall of the cylinder is fixed with an inwardly protruding stirring piece. In this way, under the agitation of the powder agitating mechanism, the powder that enters through the feed port with the conveying wind can effectively separate the coarse powder and the fine powder through the centrifugal force of the rotation and the action of the air flow. An air induction device can be installed downstream to help the separated finer powder rise to the top of the shell with the air flow and be discharged from the fine powder outlet, while the coarser powder will fall to the bottom of the shell and be discharged. Discharge from the coarse powder outlet.

Description

Powder classification device

technical field

The utility model relates to the field of powder classification, in particular to a powder classification device, which is especially suitable for the separation of catalyst coarse powder and fine powder.

Background technique

Powder is widely used in various fields of chemical industry, which often involves the classification of powder. For example, in the chemical industry, catalytic cracking catalysts undergo gelation, spraying and other processes during the preparation process. After the spraying process, the catalyst particles are uneven in thickness. Therefore, according to the requirements of different refineries, we need to screen the catalyst particles. For particularly fine and particularly coarse Particles are filtered out. Generally, the particles of catalysts are required to be sieved between 40-80 μm, and the existing cyclone separators cannot accurately and effectively meet the industrial requirements. Therefore, it is necessary to develop a coarse powder and fine powder separation device that can effectively control the sieving of catalysts. Within its range, catalyst particles of different sizes can be separated according to requirements, so that it is convenient to recycle fine powder and coarse powder of catalyst with different particle sizes.

For example, Chinese patent publication CN1935349 provides a gas-solid fluidization coupling device, which includes at least one stage of gas-solid fluidized bed body, the fluidized bed body is a vertically arranged cylinder, and the top is a tapered diameter-reducing structure. The upper part of the reduced-diameter structure forms a small particle outlet pipe, and the bottom of the fluidized bed is provided with a large particle outlet pipe, and a particle inlet pipe is provided on the side wall; a gas distribution plate is provided in an inverted conical shape in the cylinder, and the upper part of the fluidized bed is provided with a gas distribution plate. The lower end of the fluidized bed is closed, and the lower part is connected to the large particle outlet pipe, so that the gas distribution plate, the large particle outlet pipe, part of the cylinder and the lower head of the gas-solid fluidized bed form a closed space for the particles, and the closed space The cylinder wall corresponding to the space is provided with an air inlet pipe for introducing fluidization gas.

Chinese patent publication CN102676206A proposes a gas-solid circulation mixed stripper and a method for mixing and stripping solid particles. The gas-solid circulating mixed stripper comprises: a cylinder with an inner cavity, a draft cylinder, an annular gas distributor, a gas distributor for the draft cylinder, a gas outlet extending into the interior of the cylinder, the The lower end of the cylinder is connected to the cone, the outlet of the mixed solid particles is arranged below the cone, the loose steam ring is located at the bottom of the cone and above the outlet of the mixed solid particles, and is respectively connected to the inside of the cylinder. The solid particles of the first type enter the channel and the solid particles of the second type enter the channel. The mixing and stripping method of the solid particles shown above adopts the aforementioned gas-solid circulation mixed stripper.

In addition, the existing fine powder separation device also has the technology of arranging multi-layer screens to achieve particle separation. The above-mentioned separation technology has the disadvantages of imprecise particle separation and inconcentrated catalyst screening in the process of separating coarse powder and fine powder. It is easy to appear too fine or too coarse particles in catalyst screening, and these separated fine particles And the size range of coarse particles is too wide, which is not conducive to recycling and effective utilization.

Utility model content

The purpose of the utility model is to provide a powder classifying device, which has a simple structure and good powder separation effect.

In order to achieve the above object, the utility model provides a powder classifying device, which includes a housing, the housing has a feed inlet, a fine powder outlet at the top and a coarse powder outlet at the bottom, and the housing A powder agitating mechanism is installed in the body, wherein the powder agitating mechanism includes a cylinder rotatably installed in the housing along a vertical axis, the side wall of the cylinder is spaced apart from the side wall of the housing and A plurality of screening passages are respectively distributed along the axial direction and the circumferential direction, and an inwardly protruding stirring plate is fixed on the inner wall of the cylinder.

In this way, under the agitation of the powder agitating mechanism, the powder that enters through the feed port with the conveying wind can effectively separate the coarse powder and the fine powder through the centrifugal force of the rotation and the action of the air flow. An air induction device can be installed downstream to help the separated finer powder rise to the top of the shell with the airflow and be discharged from the fine powder outlet, that is, the fine powder can be carried out by the airflow from bottom to top. The coarser powder then descends to the bottom of the shell and is discharged from the coarse powder outlet.

Other features and advantages of the present utility model will be described in detail in the following specific embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, together with the following specific embodiments, are used to explain the utility model, but do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is a schematic structural view of a powder classifying device provided by the first embodiment of the present invention;

Fig. 2 is a schematic structural view of a powder classifying device provided by the second embodiment of the present invention;

Fig. 3 is a schematic structural view of a powder classifying device provided by the third embodiment of the present invention;

Fig. 4 is the cross-sectional view of the powder classification device in Fig. 3;

Fig. 5 is a schematic diagram of the structure of the powder classification system provided by the embodiment of the present invention.

detailed description

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

In the present utility model, unless otherwise specified, the used orientation words such as "upper, lower, bottom, top" are usually defined under the normal operation of the powder classifying device provided by the embodiment of the utility model , specifically refer to the direction of the drawings described in FIGS. 1 to 3 , and “inside and outside” refer to the inside and outside of the contours of the corresponding components.

As shown in Fig. 1 to Fig. 4, the utility model provides three kinds of powder classification devices through three implementation modes. In addition, as shown in FIG. 5 , the utility model also provides a powder classification system that can apply the three implementation modes. The powder classifying device and system are especially suitable for classifying powdered catalysts. Each powder classification device and classification system of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the powder classifying device provided by the first embodiment of the utility model includes a housing 100, which has a feed inlet 101, a fine powder outlet 102 at the top and a coarse powder outlet at the bottom. material inlet 103, and a powder stirring mechanism 104 is installed in the housing 100, and the powder stirring mechanism is used to stir the powder entering from the feed inlet 101, so that the powder entering through the feed inlet 101 along with the conveying wind is Under the agitation of the powder stirring mechanism 104, the coarse powder and the fine powder can be effectively separated by the rotating centrifugal force and the air flow. In practical applications, an air induction device can be installed downstream of the fine powder outlet 102 to facilitate the separation. The finer powder that comes out can rise to the top of the housing 100 with the airflow and be discharged from the fine powder outlet 102, that is, the fine powder can be carried out by the airflow from bottom to top, while the coarser powder descends to the shell. The bottom of the body 100 is discharged from the coarse powder discharge port 103.

Wherein in this embodiment, the powder stirring mechanism 104 includes a rotating shaft 105 rotatably connected to the side wall of the housing 100 and a stirring member 106 connected to the rotating shaft 105, and the stirring member 106 is connected to the axial direction of the rotating shaft 105. Set on an angled slope. Specifically, the axial angle between the stirring member 106 and the rotating shaft may be 45°-60°, for example, 45°. Thereby by the rotation of rotating shaft 105, the agitator 106 that is inclined to be arranged on the rotating shaft 105 has larger axial stirring area, and can stir in peripheral region, the centrifugal force that stirs formation and air flow, coarse powder and fine powder are stirred and Its own weight is separated from top to bottom, and the induced wind set at the outlet 102 will take out the fine powder upwards with the air flow, so that the fine powder can be effectively discharged through the fine powder discharge port 102.

In this embodiment, the rotating shaft 105 is vertically connected to the side wall of the housing 100 to facilitate assembly between the rotating shaft 105 and the side wall of the housing 100 , for example, the two may be assembled through bearings. In addition, for the rotation of the rotating shaft 105 , a power device connected to the rotating shaft 105 , such as a motor, is provided outside the housing 100 to drive the rotating shaft 105 to rotate. In other possible implementation manners, the rotating shaft 105 may also be inclined to the side wall of the casing 100 .

In this embodiment, the stirring member 106 may be a plate, such as a metal circular plate, and the rotating shaft 105 is connected through the plate, such as welding. Thereby, the structure and connection mode of the stirring member and the rotating shaft are simplified conveniently. It is easy to process, and the rotating circular plate can evenly throw out the powder towards the surroundings, and the separation effect is better. In addition, the plate can also be a square plate, or other paddle-shaped structures that are not plates, such as columns.

In this embodiment, there are multiple rotating shafts 105 arranged at intervals along the height direction. In order to improve the stirring effect of the powder, furthermore, the uppermost rotating shaft 105 extends from the side wall of the housing 100 toward the feeding port 101 . Thus, the powder just entering the housing 100 is stirred to increase the efficiency of separation and classification.

In addition, as shown in Figure 1, the adjacent rotating shafts 105 are respectively connected on the opposite side walls of the casing 100, and the inclination directions of the adjacent stirring members 106 are opposite, so that the rotation between the two rotating shafts 105 The areas form mutually disturbing airflow, which in turn increases the agitation effect of the powder, so that the airflow can better separate the fine powder from the coarse powder, so that it can be discharged through the fine powder outlet 102 on the top of the housing 100 under the action of the airflow, thereby efficiently Complete powder classification. In addition, in this embodiment, in order to increase the stirring efficiency, there are multiple stirring members 106 arranged at intervals along the axial direction of the rotating shaft 105 , that is, there are also plural stirring members 106 on each rotating shaft 105 .

In this embodiment, in order to facilitate the discharge of coarse powder from the bottom of the housing 1, the housing 100 includes a cylindrical section 107 and a conical section 108 connected up and down. The port 102 is located at the top of the side wall on the opposite side of the cylindrical section 107 and the feeding port 101, and the coarse powder outlet 103 is located at the bottom cone point of the conical section 108, so that the coarse powder thrown onto the side wall of the housing 1 can pass through the conical section. 108 tapers and converges to the coarse powder outlet, thereby avoiding powder accumulation in the housing 1 and causing waste of powder. In addition, the fine powder discharge port 102 is located on the opposite side of the feed port 101 to facilitate the discharge of fine powder.

Among them, in order to ensure the separation effect that enters with the conveying wind, the feed port 101 is located between the fine powder discharge port 102 and the coarse powder discharge port 103, that is, the three are staggered in the vertical direction, so that the freshly entered The powder is directly discharged through the fine powder outlet 102 along with the conveying wind, but the stirred fine powder is discharged from the outlet 102 under the drag force of the air flow through the agitation of the powder stirring mechanism. In addition, in order to avoid that the fine powder head is too large and affect the discharge efficiency, it is further preferred that the vertical distance between the feed port 101 and the fine powder discharge port 102 is the same as the vertical distance between the feed port 101 and the coarse powder discharge port 103. The ratio of the vertical distance is 1:1-1:6, for example, 1:3-1:6. That is, the feed port 101 is arranged closer to the fine powder discharge port 102 . In addition, it should be noted that the above arrangement of the feed inlet, the fine powder outlet and the coarse powder outlet in this embodiment is also applicable to the second and third embodiments described below.

In the specific work, taking the catalyst as an example, in order to realize that the fine powder and coarse powder can be discharged, for example, the spray-molded catalyst can be carried into the housing 1 through the feed port 101 at a certain speed, for example, carried by the conveying wind. . In addition, suction devices can also be installed downstream of the fine powder outlet 102 and the coarse powder outlet 103, so as to discharge the classified fine powder and coarse powder through vacuum suction. In addition, in the specific work, the rotating shaft 105 rotates at a speed of, for example, 300-500r/min, and is selected according to the requirements of the catalyst particles. The fine powder outlet 102 obtains the relatively finest catalyst particles (commonly known as catalyst fine powder, generally particle diameter less than 20μm).

The powder classifying device in the first embodiment has been introduced above, and the powder classifying device in the second embodiment protection mode will be described in detail below with reference to FIG. 2 .

The powder classifying device provided by the second embodiment of the present utility model includes a housing 200, the housing 200 has a feed port 201, and the housing 200 also has a fine powder discharge port 202 at the top and a coarse powder discharge port at the bottom. Inlet 203, and a powder agitating mechanism 204 is installed in the housing 200, and the powder agitating mechanism 204 is used to stir the powder entering from the feed port 201, so that the powder entering through the feed port 201 with the conveying wind is Under the agitation of the powder stirring mechanism 204, the coarse powder and the fine powder can be effectively separated by the rotating centrifugal force and the air flow. In practical applications, an air induction device can be installed downstream of the fine powder outlet 202 to facilitate the separation. The finer powder that comes out rises to the top of the casing 200 with the airflow and is discharged from the fine powder outlet 202, that is, the fine powder can come out by the airflow from bottom to top, while the coarser powder falls to the casing 200. The bottom of the powder is discharged from the coarse powder outlet 203.

Specifically, the powder agitating mechanism 204 provided by the second embodiment of the present invention includes a rotating shaft 205 rotatably connected to the top wall of the housing 200 , and the rotating shaft 205 is connected with a stirring paddle 212 . Therefore, in this embodiment, the powder stirring mechanism 204 realizes stirring the powder by means of stirring. Among them, under the agitation of the stirring paddle 212, the powder in the housing 1 is agitated, and the coarse powder and fine powder are agitated and separated by their own weight through the rotating centrifugal force and air flow generated by the agitation. The induced air will take out the fine powder with the air flow upward, so as to realize the classification of coarse powder and fine powder.

In this embodiment, the rotating shaft 205 extends vertically downward from the top wall, so as to facilitate the assembly of the rotating shaft 205 and the top wall. And the stirring paddle 212 extends perpendicularly to the rotating shaft 205, so that the stirring paddle 205 extending toward the side wall can agitate the powder 1 through the swirling airflow generated during rotation. At this point, the fine powder is separated from the coarse powder by centrifugal force and the resulting air flow. Further, there are a plurality of agitating paddles 212 arranged at intervals along the axial direction of the rotating shaft 205 , and each agitating paddle 212 has a plurality of paddles arranged at equal intervals along the circumferential direction. Therefore, the inside of the casing 1 has a stirring effect in the height direction, and the multiple paddles make the stirring effect of the powder better. The agitating paddle 212 can be in the form of a propeller, so that when a rotating airflow is generated, an upward airflow can also be generated in the height direction of the housing 1 to better separate the fine powder. Furthermore, the direction of the airflow generated by the plurality of agitating paddles arranged in the axial direction is the same, so as to separate the fine powder more effectively, so as to better facilitate the discharge of the fine powder from the fine powder outlet.

In addition, in this embodiment, the housing 200 includes a cylindrical section 206 and a conical section 207 connected up and down in sequence, the feeding port 201 is located on the side wall of the cylindrical section 206, and the fine powder outlet 202 is located between the cylindrical section 206 and the feeding port. At the top of the side wall opposite to 201 , the coarse powder outlet 203 is located at the bottom of the conical section 207 . Therefore, it is convenient for the coarse powder to pass through the conical section 207 to complete the collection to the coarse powder outlet 203 . In addition, the feed port 201 is located between the fine powder discharge port 202 and the coarse powder discharge port 203, and the vertical distance between the feed port 201 and the fine powder discharge port 202 is the same as that between the feed port 201 and the coarse powder discharge port. The ratio of the vertical distance between the feed ports 203 is 1:1-1:6, for example, 1:3-1:6, so as to better discharge the fine powder.

More specifically, the conical segment 207 includes a plurality of conical segments that connect up and down in sequence and whose cone angles become larger in sequence. Like this, through the conical section 207 that cone angle changes, can make bigger coarse powder particle settle down to the coarse powder outlet 203 discharge of bottom from several cone sections earlier, and other smaller coarse powder particles are discharged according to the cone section. The rolling settling ability of each section gradually settles along each cone section. In this way, in the mode of intermittent feeding, the coarse powder in the powder entered in the same period can be discharged from the coarse powder outlet 203 at the bottom at different times. As shown in Figure 2, as an embodiment, a plurality of cone segments include a first cone segment 208, a second cone segment 209 and a third cone segment 210 connected up and down in sequence, and the first cone segment 208 is in contact with the cylindrical segment 206 Then, the bottom of the third cone section 210 is butted with a fourth cone section 211, the cone angle of the fourth cone section 211 is smaller than the cone angle of the first cone section 210, and the coarse powder outlet 103 is located at the fourth cone section 211 Bottom cone angle. That is, the smallest cone angle of the fourth cone section 211 facilitates the collection and discharge of the powder. The cone angles of the first cone section 208, the second cone section 209 and the third cone section 210 gradually become larger, thereby ensuring that the coarse powder with larger particles falls first. This way of arranging multiple cone segments can be applied to the first or third embodiment as well as the present embodiment.

Specifically, the cone angle of the first cone section 208 can be 15°-20°, the cone angle of the second cone section 209 can be 20°-35°, and the cone angle of the third cone section 210 can be 35°-60°, The cone angle of the fourth cone segment 211 may be 1°-5°. In addition, in order to cope with the tapered conical section 207, the radial length of the plurality of agitating paddles 212 arranged at intervals along the axial direction gradually decreases from top to bottom, so that the coarse powder can slide down the side wall smoothly, and ensure that the casing 1 The airflow inside is stable. More specifically, there may be three stirring paddles 212, corresponding to the first, second and third cone segments respectively.

In specific work, the rotating shaft 205 can rotate at a speed of, for example, 300-500r/min, which is selected according to the requirements of the catalyst particles. The fine powder outlet 202 can obtain relatively the finest catalyst particles, generally with a particle size of less than 20 μm.

The powder classifying device in the second embodiment has been described above, and the powder classifying device in the third embodiment will be described below with reference to FIG. 3 .

The powder classifying device provided by the third embodiment of the utility model includes a housing 300, the housing 300 has a feed port 301, and the housing 300 also has a fine powder outlet 302 at the top and a coarse powder outlet at the bottom. Inlet 303, and a powder agitating mechanism 304 is installed in the housing 300, and the powder agitating mechanism is used to stir the powder entering from the feed port 301, so that the powder entering through the feed port 301 with the conveying wind is in the powder Under the agitation of the material stirring mechanism 304, the effective separation of the coarse powder and the fine powder is achieved through the centrifugal force of rotation and the action of the air flow. In practical applications, an air induction device can be installed downstream of the fine powder outlet 302 to facilitate the separation. The finer powder rises to the top of the housing 300 with the airflow and is discharged from the fine powder outlet 302, that is, the fine powder can be carried out by the airflow from bottom to top, while the coarser powder descends to the housing 300 and discharged from the coarse powder outlet 303.

In this embodiment, the powder stirring mechanism 304 includes a cylinder 305 rotatably installed in the housing 300 along the vertical axis, the side wall of the cylinder 305 is spaced from the side wall of the housing 300 and arranged along the shaft. A plurality of screening passages 306 are respectively distributed in the axial direction and the circumferential direction, that is, there are a plurality of screening passages 306 in the axial direction and the circumferential direction, and the inner wall of the side wall is fixed with an inwardly protruding stirring plate 307 . Therefore, through the rotation of the cylinder 305, the agitating blade 307 in the cylinder 305 can stir the powder, at this time, a rotating airflow can be generated in the cylinder, and under the action of the centrifugal force and airflow formed by the agitation, the coarse powder can mainly pass through the sieve. The sub-channel 306 throws out the cylinder 305 and settles to the coarse powder outlet 303 to be discharged, while the fine powder can be carried to the fine powder outlet 302 by the airflow from bottom to top to be discharged, so that the coarse powder and The fine powder is stirred and separated up and down by its own weight.

Wherein, in this embodiment, the side wall of the cylinder body 305 is formed as a grid structure formed by the intersection of the axial rod 308 and the ring rod 309, and the screening channel 306 is a grid hole, so that multiple The formation of a screening channel 306, and the strength of this structure can be guaranteed. In other embodiments, the cylindrical body 305 can also be rolled and processed with a plurality of screening channels 306 from a whole plate.

In addition, in this embodiment, in order to realize the agitation of the powder, one embodiment is that the agitation piece 307 is formed as a helical structure extending up and down along the inner wall of the cylinder 305, so that when the cylinder 305 rotates, it can not only The rotating air flow is generated in the cylinder 305 to stir the powder, and it can also make the air flow have a tendency to move upwards to help separate the fine powder, so that the classification effect of the powder is better. In this embodiment, there can be one or more stirring pieces 307 .

In addition, another embodiment is that, as shown in FIG. 4 , there are multiple stirring plates 307, and each stirring plate in the multiple stirring plates 307 is a structure formed on a plane, and is connected to the axis of the cylinder body 305 respectively. Arranged at an angle. Therefore, when the cylinder 305 rotates, an upwardly flowing airflow can also be formed in the cylinder 305 to separate the fine powder. Specifically, the included angle between the stirring plate 307 and the axis of the barrel 305 is 30°-60°, for example, 45°. In addition, preferably, a plurality of agitating blades 307 are respectively located on a plurality of parallel planes, that is, the planes where the agitating blades are located are parallel to each other and, thus, the cylinder body 305 can be made Airflow can be formed in the height direction in the 305 to improve the effect of coarse powder throwing and fine powder separation.

As a way of rotating the cylinder 300, as shown in FIGS. The connecting columns 311 are connected together. In this way, the rotation of the cylinder 300 along the vertical axis can be realized, and the structure can be simplified, so that the powder can enter and exit the cylinder 305 through the gaps between the plurality of connecting columns 311 . In other embodiments, the cylinder body 300 can also realize the rotation along the vertical axis through chain transmission, gear transmission and other ways.

In addition, in order to achieve more levels of separation of the powder, as shown in Figure 3, the housing 300 is also provided with a middle discharge port 312, the middle discharge port 312 is located between the coarse powder discharge port 303 and the fine powder discharge port. Between the feed port 302. In this way, the particle diameter of the powder discharged from the middle part discharge port 312 will be between the particle diameters of the powder discharged from the fine powder discharge port 302 and the coarse powder discharge port 303 . More preferably, there are multiple middle outlets 312 , such as two, and they are arranged at intervals along the height direction on the side wall of the housing 300 , so as to achieve more stages of separation of the powder. This way of setting the middle outlet 312 is not only applicable to this embodiment, but also can be applied to the first and second embodiments.

In this embodiment, the housing 300 includes a cylindrical section 313 and a conical section 314 connected up and down, the feed inlet 301 is located on the side wall of the cylindrical section 313, and the fine powder outlet 302 is located in the cylindrical section 313 opposite to the feed inlet 301 At the top of the side wall of the side, the coarse powder outlet 303 is located at the bottom cone point of the conical section 314. Thereby avoiding the accumulation of powder in the housing 1 . In addition, the feed port 301 is located between the fine powder discharge port 302 and the coarse powder discharge port 303, and the vertical distance between the feed port 301 and the fine powder discharge port 302 is the same as that between the feed port 301 and the coarse powder discharge port. The ratio of the vertical distance between the feed ports 303 is 1:1-1:6, for example, 1:3-1:6, so as to better discharge the fine powder.

In specific work, the rotating shaft 305 can rotate at a speed of, for example, 300-500r/min, which is selected according to the requirements of the catalyst particles. The fine powder outlet 302 can obtain relatively the finest catalyst particles, generally with a particle size of less than 20 μm. In addition, when the middle outlet 312 is not needed, a detachable blind plate can be installed on the middle outlet 312 . Thereby, the optional use of the middle discharge port 312 is realized.

The powder classification devices in the three embodiments are described above, and the powder classification system provided by the present invention is introduced below in conjunction with Fig. 5, wherein the powder classification system includes a plurality of powder classification devices, wherein each powder classification device All have the separation ability of coarse powder and fine powder, specifically, each powder classifying device comprises housing 300, and this housing 300 has feed inlet 301, and housing 300 also has the fine powder outlet 302 that is positioned at the top and Coarse powder outlet 303 is positioned at the bottom, and the powder stirring mechanism 304 that is used to stir the powder that enters from feed inlet 301 is installed in the housing 300, and this powder stirring mechanism is used for stirring the powder that enters from feed inlet 301. Powder, and the downstream of the fine powder outlet 302 of the powder classification device located in the most downstream is installed with an air induction device. In this way, under the agitation of the powder agitating mechanism 304, the powder that enters through the feed port 301 with the conveying wind achieves the effective separation of coarse powder and fine powder through the centrifugal force of rotation and the action of air flow, and under the action of the air-inducing device, it can make The separated finer powder rises to the top of the housing 300 with the airflow and is discharged from the fine powder outlet 302, that is, the fine powder can be carried out by the airflow from top to bottom, while the coarser powder is Descend to the bottom of the housing 300 and be discharged from the coarse powder outlet 303.

In order to classify the powder more finely, in the powder classification system provided by the utility model, the feed port 301 of the downstream powder classification device and the coarse powder discharge port 303 or The fine powder outlet 302 is connected. In this way, the powder classification system provided by the utility model can further separate the coarse powder or fine powder separated by the upstream device through the downstream classification device, so as to accurately obtain the required grade of powder.

As shown in Figure 5, in this embodiment, in order to meet the fine powder that is difficult to obtain accurately in the process, the fine powder outlet 302 of the powder classification device located at the most upstream is connected in series with multi-stage powder classification devices in sequence. In the multi-stage powder classifying device, the feed port 301 of the downstream powder classifying device communicates with the fine powder outlet 302 of the upstream powder classifying device. Therefore, the fine powder in the powder material can be separated multiple times, so that the precision of the fine powder discharged from the fine powder discharge port in each powder material classifying device gradually increases. Furthermore, in this embodiment, the coarse powder can only be separated twice, that is, the coarse powder outlet 303 of the most upstream powder classifying device is connected to a powder classifying device. In other embodiments, multiple powder classifying devices may be connected in series on the coarse powder outlet 303 and only one powder classifying device is connected to the fine powder outlet 302 .

It should be noted that what the powder classification system in Fig. 5 uses is the powder classification device in the above-mentioned third embodiment of the utility model, and in other embodiments, the powder classification system of the utility model can also use The powder classifying devices in the first and second embodiments, or the first, second and third powder classifying devices can be used at the same time, and these modifications all fall within the protection scope of the present invention.

The preferred embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the specific details of the above-mentioned embodiment. These simple modifications all belong to the protection scope of the present utility model.

In addition, it should be noted that the specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be explained separately.

In addition, any combination of various implementations of the present invention can also be made, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (12)

1. a powder lot classifying apparatus, it is characterized in that, comprise housing (300), this housing (300) has charging aperture (301), it is characterized in that, described housing (300) also has the meal discharging opening (303) that is positioned at the fine powder discharging opening (302) at top and is positioned at bottom, and powder stirring mechanism (304) is installed in described housing (300), wherein said powder stirring mechanism (304) comprises along vertical axis and is installed in rotation on the cylindrical shell (305) in described housing (300), the sidewall spacers setting of the sidewall of this cylindrical shell (305) and described housing (300) and be distributed with respectively along the axial and circumferential directions multiple screening passages (306), on the inwall of described cylindrical shell (305), be fixed with to projecting inward stirring sheet (307).

2. powder lot classifying apparatus according to claim 1, it is characterized in that, the sidewall of described cylindrical shell (305) is formed as intersecting by axial stem (308) and circular rod (309) cell structure forming, and described screening passage (306) is grate opening.

3. powder lot classifying apparatus according to claim 1 and 2, is characterized in that, described stirring sheet (307) is formed as along the helical structure of downward-extension on the inwall of described cylindrical shell (305).

4. powder lot classifying apparatus according to claim 1 and 2, is characterized in that, described stirring sheet (307) is many, and these many stirring sheets (307) are angle with the axis of described cylindrical shell (305) respectively and are in tilted layout.

5. powder lot classifying apparatus according to claim 4, is characterized in that, described stirring sheet (307) is 30 °-60 ° with the angle of the axis of described cylindrical shell (305).

6. powder lot classifying apparatus according to claim 4, is characterized in that, described many stirring sheets (307) lay respectively in the multiple planes that are parallel to each other.

7. powder lot classifying apparatus according to claim 1, it is characterized in that, described cylindrical shell (305) is installed on the roof of described housing (300) by the rotating shaft along described vertical axis (310), between described rotating shaft (310) and described cylindrical shell (305), is connected by many joint pins (311).

8. powder lot classifying apparatus according to claim 1, it is characterized in that, on described housing (300), be also provided with middle part discharging opening (312), this middle part discharging opening (312) is positioned between described meal discharging opening (303) and described fine powder discharging opening (302).

9. powder lot classifying apparatus according to claim 8, is characterized in that, described middle part discharging opening (312) is two and wants short transverse to be disposed on the sidewall of described housing (300).

10. powder lot classifying apparatus according to claim 1, it is characterized in that, described housing (300) comprises cylindrical section (313) and the conical section (314) of joining up and down, described charging aperture (301) is positioned at the sidewall of described cylindrical section (313), described fine powder discharging opening (302) is positioned at the sidewall top of described cylindrical section (313) and described charging aperture (301) opposite side, and described meal discharging opening (303) is positioned at the bottom cone point of described conical section (314).

11. according to the powder lot classifying apparatus described in claim 1 or 10, it is characterized in that, described charging aperture is positioned between described fine powder discharging opening (302) and described meal discharging opening (303), and vertical ratio of distances constant between vertical distance and described charging aperture (301) and described meal discharging opening (303) between described charging aperture (301) and described fine powder discharging opening (302) is 1:1-1:6.

12. powder lot classifying apparatus according to claim 11, it is characterized in that, the vertical ratio of distances constant between the vertical distance between described charging aperture (301) and described fine powder discharging opening (302) and described charging aperture (301) and described meal discharging opening (303) is 1:3-1:6.