CN202984101U - Multi-stage classifier for single box body - Google Patents

Abstract

The utility model discloses a multi-stage classifier for a single box body. The multi-stage classifier comprises a box body, wherein the box body is internally provided with a clapboard used for dividing the inner cavity of the box body into an upper classifying cavity and a lower air inlet cavity, the clapboard is slantwise arranged by gradually lowering from one end to the other end of the box body, and air through holes for communicating the classifying cavity with the air inlet cavity are formed in the clapboard; an air inlet and a material inlet passageway are arranged on the box body, and a feeder is connected to the material inlet passageway; at least two impeller motors which are arranged at intervals are connected to the box body, a classifying impeller arranged in the box body is arranged on a shaft of each impeller motor, and the classifying specifications of the classifying impellers are different from one another; material outlet passageways which correspond to the positions of the classifying impellers one by one and are connected with a power collecting device are arranged on the box body; and the air inlet cavity is internally provided with a blanking passageway which is near to the lower end of the clapboard and communicates the classifying cavity with the outer part of the box body, and a discharging device is arranged on an outlet of the blanking passageway. The classifier is compact in structure, small in system volume, small in system resistance, and low in energy consumption.

Description

Single box multi-stage classifier

technical field

The utility model relates to a single-box multi-stage classifier.

Background technique

In the dry air classification of powder, the impeller classifier (its cavity is mostly cylindrical) is commonly used. In use, a classifier only separates products of one particle size. When producing multi-stage products, then Multiple single-stage classifiers need to be used in series, so the system resistance is high, energy consumption is high, the system is huge, and the floor area is large.

Utility model content

The technical problem to be solved by the utility model is to provide a single-cabinet multi-stage grading machine, so as to avoid the disadvantages of the multi-stage grading series system, such as large resistance, high energy consumption, and large occupied area.

In order to solve the above technical problems, the utility model provides a single-box multi-stage classifier with the following structure, including a box body, and its structural feature is that the box body is provided with a grading chamber that divides the box inner cavity into an upper part and a The baffle of the air inlet chamber at the lower part is arranged in an inclined shape from one end of the box body to the other end, and a plurality of air passage holes connecting the grading chamber and the air inlet chamber are arranged on the baffle; There is an air inlet connected to the air inlet chamber and a high-end feed channel connected to the grading chamber and close to the partition. The feeder is connected to the feeder; the box is connected to more than two impeller motors set in compartments , the shaft of each impeller motor is equipped with a grading impeller located in the box, and the grading specifications of the grading impellers are different; The discharge channel connected to the device; the air inlet chamber is provided with a discharge channel near the lower end of the partition and connected to the classification chamber and the outside of the box body, and the outlet of the discharge channel is equipped with a discharge device.

The grading impellers are arranged in descending order according to the particle size of the separated material particles, and the grading impeller capable of separating the smallest particle size is closest to the feeding channel.

An air regulating valve is installed on the discharge channel.

The air inlet is arranged at the end of the box corresponding to the high end of the partition.

The feeder and the discharger have the same structure, and both include a housing. A material cavity is arranged in the housing, and a feeding impeller driven by a feeding motor connected to the outside of the housing is arranged in the material cavity. The outer blades of the feeding impeller are The edges all form a sealing relationship with the cavity wall of the material cavity. The top of the housing is provided with a material inlet communicating with the material cavity, and the bottom of the housing is provided with a material outlet communicating with the material cavity.

The single-box multi-stage classifier with the above-mentioned structure integrates grading impellers of various specifications into one box, and each grading impeller separates a powder with a particle size specification. It not only has a compact structure, but also has a small system volume and a small footprint. , and can also avoid the defects of large system resistance and high energy consumption caused by the series use of multiple single-stage classifiers.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a sectional view along line A-A in Fig. 1 .

Detailed ways

As shown in Figure 1 and Figure 2, the single-box multi-stage classifier includes a box body 1. For the convenience of description, take the direction of Figure 1 on the drawing as a reference, the left end of Figure 1 is the left end of the box body 1, and the right end of Figure 1 is the right end of the box body 1, the top of FIG. 1 is the rear side of the box body 1, and the bottom of FIG. 1 is the front side of the box body 1. The box body 1 is provided with a partition 4, which divides the inner cavity of the box body 1 into an upper grading chamber 2 and a lower air inlet chamber 3, and the partition 4 is gradually lowered from one end of the box body to the other end. The oblique shape of setting, promptly the left end of dividing plate 4 is high and the right end is low. A plurality of air passage holes 5 connecting the grading chamber 2 and the air inlet chamber 3 are arranged on the partition 4; The feeding channel 7 is arranged obliquely in order to facilitate the material to enter the classification chamber 2 . The feeding channel 7 is connected with a feeder 8 , and a hopper 12 is provided on the feeding port of the feeder 8 . Two or more impeller motors 9 arranged in compartments are connected on the rear side wall of the box body 1, and only three impeller motors 9 are shown in Fig. , four or five, or even more. The shaft of each impeller motor 9 is equipped with a classifying impeller 20 located in the casing 1, and the classification specifications of the classifying impeller 20 are different; Arranged in order from small to large, the grading impeller that can separate the smallest particle size is the closest to the feed channel 7, that is to say, the grading impeller that can separate the smallest particle size is located at the left end of the grading chamber 2, and the other impellers are divided according to the particle size of the separated material. The order of the diameters is from small to large and away from the left end of the grading chamber 2. The three impellers with different grading specifications shown in the figure, the grading impeller capable of separating the smallest particle size is located at the left end of the grading chamber 2, and the grading impeller capable of separating the largest particle size is located at the right end of the grading chamber 2, which can separate the intermediate particles. The grading impeller with diameter is located in the middle. The front side wall of the box body 1 is provided with a discharge channel 15 corresponding to the position of the grading impeller and used to connect with the powder collection device. In other words, there are several grading impellers to provide several discharge channels 15; An air regulating valve 13 is housed on each discharge channel, and the air regulating valve 13 is used for adjusting the air volume. The air inlet chamber 3 is provided with a blanking channel 10 which is located near the lower end, ie, the right end, of the partition plate 4 and communicates with the classification chamber 2 and the outside of the box body 1 . The blanking channel 10 is formed in such a way that a gap is left between the right end of the partition plate 4 and the right end wall of the box body 1 to form an upper blanking opening, and the bottom wall of the box body 1 is provided with a lower blanking opening corresponding to the position of the upper blanking opening The right end of the dividing plate 4 is connected with a vertical plate 14 extending downward and connected with the left edge of the lower blanking port. The vertical plate 14, the right end wall of the box body 1, and the front and rear side walls of the box body 1 enclose the blanking cavity, and the upper and lower blanking The above-mentioned blanking channel 10 is formed by the mouth, the blanking chamber and the lower blanking port. The outlet of the blanking passage 10 can be directly connected with a discharge device 11 , and the outlet of the blanking passage 10 can also be connected with a discharge pipe 16 , and the discharge device 11 is connected to the discharge pipe 16 .

With reference to Fig. 1: described feeder 8 and discharger 11 structure are identical, all comprise housing 30, be provided with material cavity 31 in the housing 30, be provided with in the material cavity 31 and be provided with by the feeding motor drive that is connected on the outside of housing. Feed impeller 32, i.e. feed impeller 32, is connected on the shaft of feed motor, the outer edges of the multiple blades of feed impeller 32 all form a sealed fit relationship with the cavity wall of material cavity 31, and the top of housing 30 is provided with material cavity 31 communicated with. The bottom of the housing 30 is provided with a discharge port communicating with the material cavity 31, and the feeding motor is not shown in the figure; the gap between adjacent blades is the material receiving area. The material entering from the feeding port of the feeder 8 will fall in the material holding area corresponding to the feeding port. With the rotation of the feeding impeller, the material holding area filled with the material will correspond to the feeding port, so as to realize the For conveying from the feed port to the discharge port, during the rotation of the feed impeller, there will always be some blades in a state of sealing cooperation with the wall of the feed chamber 31, so that the material can be transported and sealed at the same time. The working process of the feeder 11 is the same as that of the feeder 8, and will not be repeated here.

The structure of grading impeller 20 is prior art, with reference to Fig. 1 and Fig. 2, grading impeller 20 comprises support plate 17 and flange plate 18, and support plate 17 is used for being connected with impeller motor 9, and flange plate 17 support plate 17 and method There are multiple blades 19 arranged radially and connected to the above two disks at both ends of the ring between the blue disks 18. The inner edges of the blades envelop the inner cavity of the grading impeller, and the inner cavity and the inner hole of the flange 18 A powder flow channel is formed, and the gap between adjacent blades is the entry channel for powder particles. The smaller the gap, the smaller the particle size of the powder particles entering the inner cavity of the classifying impeller through the gap. There should be a proper distance between the flange plate 18 and the inner end of the corresponding discharge channel 15. The size of the distance should meet the requirement that the grading impeller does not contact the inner end of the discharge channel 15 when it rotates, and the material is discharged when the classifier is working. An airtight fit relationship is formed between the inner end of the passage 15 and the flange 18 to prevent material grains from entering between the flange 18 and the inner end of the discharge passage 15 .

The working process of the utility model is described below by taking the single-cabinet multi-stage classifier shown in Fig. 1 and Fig. 2 as an example. The three discharge channels 15 are respectively connected to the powder collecting device, and the powder collecting device is connected to the induced draft fan to be used. The powder collecting device can choose existing products such as cyclone dust collector or bag filter. For ease of description, the grading impeller on the left is called the primary grading impeller, the grading impeller in the middle is called the secondary grading impeller, and the grading impeller on the right is called the tertiary grading impeller. The particle size separated by the stage grading impeller is relatively large, and the particle size separated by the three-stage grading impeller is the largest; the discharge channels 15 corresponding to the three grading impellers are called the primary discharge channel and the secondary discharge channel respectively. And three discharge channels. Start the induced draft fan, the air flow enters the air intake chamber 3 from the air inlet 6, passes through the partition plate 4, and reaches the classification chamber 2, and is respectively attracted by the negative pressure in the three discharge channels 15 in the classification chamber 2 and divided into three airflows, respectively Flow to the primary classifying impeller, the secondary classifying impeller and the tertiary classifying impeller to participate in classification, that is to say, in the classifying chamber 2, there is a total of Three air circulation areas are formed. At this time, start the impeller motor, feeder 8 and discharger 11, the material enters the feeder 8 from the hopper 12 and is sent into the feed channel 7 by the feeder 8, and the material slides along the feed channel 7 into the classification Cavity 2, falls to the high end of the clapboard, and when the material clapboard slides to its low end, when the air flow area where the primary grading impeller of the slideway is located, under the action of the air flow, the most fine-grained material enters the primary grading impeller cavity, enters the corresponding powder collection device through the primary discharge channel; the coarse material continues to slide down along the partition, and when it reaches the air flow area where the secondary grading impeller is located, the finer-grained material in the coarse material enters the secondary grading impeller The inner cavity enters the corresponding powder collection device through the secondary discharge channel; the coarse material continues to slide down along the partition, and when it reaches the air flow area where the three-stage grading impeller is located, the coarser-grained material in the coarse material enters the three-stage classification The inner cavity of the impeller enters the corresponding powder collection device through the three-stage discharge channel; the unselected coarse material slides into the discharge channel 10 and is sent out by the discharge device 11.

In the utility model, among the impeller motors, each impeller motor is controlled by an independent frequency converter to adjust the rotating speed. The relationship between product particle size and classifying impeller speed and air volume is: the higher the speed, the finer the product particle size. The smaller the air volume, the finer the particle size of the product.

Claims (5)

1. A single-box multi-stage classifier, comprising a box (1), characterized in that the box (1) is provided with a grading chamber (2) that separates the inner cavity of the box (1) into an upper part and The partition (4) of the lower air inlet chamber (3), the partition (4) is set in a sloped shape from one end of the box to the other end, and the partition (4) is equipped with a connecting grading chamber (2) and a plurality of air passage holes (5) of the air inlet chamber (3); the box body (1) is provided with an air inlet (6) connected to the air inlet chamber (3) and a grading chamber (2) connected to and close to the compartment The feed channel (7) provided at the high end of the plate (4), the feeder (8) is connected to the feed channel (7); the box body (1) is connected with more than two impeller motors (9 ), the shaft of each impeller motor (9) is equipped with a grading impeller located in the box (1), the grading specifications of the grading impellers are different; the box (1) is equipped with the grading impeller The positions are one-to-one correspondence and are used to connect the discharge channel with the powder collection device; the air inlet chamber (3) is provided near the lower end of the partition (4) and communicates with the classification chamber (2) and the outside of the box (1) The blanking channel (10), the outlet of the blanking channel (10) is equipped with a discharge device (11). 2. The single-box multi-stage classifier as claimed in claim 1, characterized in that: the classifying impellers are arranged in order from small to large according to the particle size of the separated material particles, and can separate the smallest particle size The grading impeller is closest to the feed channel (7). 3. The single-box multi-stage classifier as claimed in claim 1, characterized in that: an air regulating valve is installed on the discharge channel. 4. The single-box multi-stage classifier according to claim 1, characterized in that: the air inlet (6) is set at the end of the box (1) corresponding to the high end of the partition (4). 5. The single-box multi-stage classifier according to any one of claims 1 to 4, characterized in that: the feeder (8) and the discharger (11) have the same structure, and both include a shell (30), the housing (30) is provided with a material chamber (31), the material chamber (31) is provided with a feeding impeller (32) driven by a feeding motor connected to the outside of the housing, and the multiple blades of the feeding impeller (32) The outer edges of the blades form a sealing relationship with the wall of the material chamber (31), the top of the housing (30) is provided with a feed port connected to the material chamber (31), and the bottom of the housing (30) is provided with a The material outlet connected to the material cavity (31).

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