CN211488576U - Multistage air separator - Google Patents

Abstract

The utility model relates to a multistage air separator, which comprises an air separation chamber extending vertically, wherein a rotary blanking valve is arranged at the top inlet of the air separation chamber, a plurality of air inlet openings of the air separation chamber are arranged on the left side wall of the air separation chamber from top to bottom, a plurality of air outlet openings of the air separation chamber are arranged on the right side wall of the air separation chamber from top to bottom, and each air outlet opening of the air separation chamber is higher than the air inlet opening of the opposite air separation chamber; the upper edge and the lower edge of the air inlet of each air separation chamber are respectively connected with an upper left inclined plate and a lower left inclined plate which incline rightwards and downwards and are parallel to each other, the upper edge of the air outlet of each air separation chamber is respectively connected with a right inclined plate which inclines leftwards and downwards, the lower edge of each right inclined plate points to the upper part of the left inclined plate, and the bottom of the air separation chamber is provided with an air separation discharge hole; the right side of the air separation chamber is provided with an air extraction chamber which covers the air outlet of each air separation chamber, and the top of the air extraction chamber is connected with an air separation shell opening. This multistage air separator can contain the seed benevolence of a small amount of shells and shells in the benevolence shell separator ejection of compact and carry out the reseparation, further reduces the shell rate, greatly improves the precision of benevolence shell separation.

Description

Multistage air separator

Technical Field

The utility model relates to a multistage air separator for the sunflower seed after will shelling separates with the hull, belongs to food processing equipment technical field.

Background

The sunflower seed oil is golden in color, clear and transparent, has faint scent and is an important edible oil. It contains a large amount of unsaturated fatty acids such as linoleic acid, which are necessary for human body, and can promote the regeneration and growth of human body cells, protect the health of skin, and reduce the accumulation of cholesterol in blood, thus being a high-grade nutrient oil.

The global production of sunflower seed oil generally shows a slow growth trend, the annual average composite growth rate of the global production of sunflower seed oil is 7.72% from 2012 to 2015, and the global production of sunflower seed oil breaks 1700 ten thousand tons in 2018. Ukrainian, russia and the european union are the major countries and regions of sunflower oil production, accounting for around 76% of the total world.

During the production process of sunflower seed oil, sunflower seeds are first shelled by a shelling machine and then enter a kernel-shell separation section to separate kernels from shells. The traditional process of the kernel-shell separation section comprises the following steps: the whole seeds and fine powder are firstly sieved by a plane rotary sieve, a part of the hulls are removed, and the rest kernels containing a small amount of hulls enter the subsequent working section. Because the separation effect of the kernels and the shells is poor, the content of the shells and the shells in the kernels entering the subsequent working section is about 16 percent generally, so that the ideal index proportion cannot be achieved, and because the shells contain a large amount of wax, the quality of the sunflower seed oil is influenced, and the economic index of production and processing is also reduced seriously.

Disclosure of Invention

An object of the utility model is to overcome the problem that exists among the prior art, provide a multistage air separator, can carry out the reseparation to the seed benevolence that contains a small amount of shells in the benevolence shell separator ejection of compact, further reduce the shell rate, greatly improve the precision of benevolence shell separation.

In order to solve the technical problem, the utility model discloses a multistage air separator, include along the air selection chamber of vertical extension, the top entry of air selection chamber is installed and is rotated the unloading valve, and the left side wall top-down of air selection chamber is equipped with multichannel air selection chamber air intake, and the right side wall top-down of air selection chamber is equipped with multichannel air selection chamber air outlet, and each air selection chamber air outlet is higher than the air selection chamber air intake of offside; the upper edge and the lower edge of the air inlet of each air separation chamber are respectively connected with an upper left inclined plate and a lower left inclined plate which incline rightwards and downwards and are parallel to each other, the upper edge of the air outlet of each air separation chamber is respectively connected with a right inclined plate which inclines leftwards and downwards, the lower edge of each right inclined plate points to the upper part of the left inclined plate, and the bottom of the air separation chamber is provided with an air separation discharge hole; an air extracting chamber covering the air outlets of the air separating chambers is arranged on the right side of the air separating chamber, and an air separating shell opening is connected to the top of the air extracting chamber.

Compared with the prior art, the utility model discloses following beneficial effect has been obtained: the seed kernels discharged from the kernel-shell separator have the content of the shells of about 16 percent, are sent to an inlet at the top of the air separation chamber through a rotary blanking valve to close air, and are alternately thrown back and forth between an upper left inclined plate and a right inclined plate in the falling process; meanwhile, fresh air enters the inner cavity of the air separation chamber from the air inlets of the air separation chambers, flows along the space between the upper left inclined plate and the lower left inclined plate to the lower right side, and is blown off rightwards from the lower edge of the upper left inclined plate, so that the fresh air is crossed with the seed kernels scattered from the upper left inclined plate, and the husk in the seed kernels is blown off by airflow due to light weight, flies upwards and rightwards along with the airflow, flies out from the air outlet of the air separation chamber above, enters the air extraction chamber, and is discharged from the air separation husk outlet at the top of the air extraction chamber under the negative pressure suction of the air extraction chamber; the winnowed kernels are scattered on the right sloping plate below, and when scattered from the lower edge of the right sloping plate, the kernels are crossed with the air flow rising below again, and once again, the hulls are blown away from the material flow; then the seeds are scattered on the upper left inclined plate of the next stage to be winnowed again, so that the seed kernels are winnowed from top to bottom in multiple stages, and the shell content in the seed kernels can reach below 9 percent.

As the utility model discloses an improve, it has left swash plate to adjust the seat to weld respectively on the lateral wall around the air separation chamber, has connect left swash plate adjusting screw in each left swash plate adjusting seat soon respectively, and left swash plate adjusting screw's upper end is supported and is leaned on the below at last left swash plate, and left swash plate adjusting screw has connect left swash plate set nut and left swash plate lock nut on, and left swash plate set nut supports and leans on the lower terminal surface at left swash plate down, and left swash plate lock nut supports and leans on the lower terminal surface at left swash plate adjusting seat. The screwing position of the left swash plate positioning nut on the left swash plate adjusting screw determines the distance between the lower left swash plate and the upper left swash plate, and the lower left swash plate and the upper left swash plate are usually kept in a parallel state. The screwing position of the left inclined plate locking nut determines the inclination angle of the upper left inclined plate and the lower left inclined plate, and the downward sliding speed and the throwing state of the seed kernels are changed, so that the winnowing effect is improved.

As a further improvement of the utility model, the length of the lower left sloping plate is greater than that of the upper left sloping plate. In the air separation process of each stage, when the seeds are scattered from the lower edge of the upper left inclined plate, the seeds are subjected to the strongest first blowing of air flow between the upper left inclined plate and the lower left inclined plate; the seeds scattered from the upper left inclined plate are scattered on the lower left inclined plate to form secondary scattering, and are subjected to secondary blowing by the air flow below; when the air flows fall from the lower edge of the lower right inclined plate, the air is blown for the third time by the lower air flow; therefore, the husk is blown three times by each stage of winnowing, and the separation effect is higher.

As a further improvement of the utility model, each air selection room air intake department is furnished with the air intake regulating plate that has can reciprocate respectively, is equipped with a plurality of air intake adjust knob respectively along the length direction of air intake regulating plate, and each air intake adjust knob's screw rod connects soon on the left side wall of air selection room, is equipped with multichannel air intake regulating plate on the air intake regulating plate and erects the groove, and each air intake adjust knob's screw rod is located corresponding air intake regulating plate and erects the groove. The air inlet adjusting knob is unscrewed, the L-shaped air inlet adjusting plate can move up and down, when the air inlet adjusting plate moves up and down, the width of the air inlet of the air separation chamber is narrowed, and the air inlet amount is reduced; when the air inlet adjusting plate moves downwards, the width of the air inlet of the air separation chamber is widened, and the air inlet amount is increased; the air inlet adjusting plate vertical groove provides an avoiding space for a screw rod of the air inlet adjusting knob, and after the air inlet adjusting knob is adjusted properly, the air inlet adjusting knob is screwed tightly to fix the air inlet adjusting plate.

As the utility model discloses a further improvement is equipped with right swash plate adjusting seat on the lateral wall around the air separation chamber respectively, has connect right swash plate adjusting screw in each right swash plate adjusting seat soon respectively, and right swash plate adjusting screw's upper end is supported and is leaned on the below at right swash plate, and right swash plate adjusting screw has screwed the right swash plate lock nut, and right swash plate lock nut supports and leans on the lower terminal surface at right swash plate adjusting seat. The right sloping plate adjusting screw is screwed in or screwed out of the right sloping plate adjusting seat, the inclination angle of the right sloping plate can be changed, and after the right sloping plate adjusting screw is adjusted properly, the right sloping plate locking nut is locked below the right sloping plate adjusting seat.

As a further improvement, the right side wall lower part of the air separation chamber is provided with a plurality of sampling ports, and each sampling port is uniformly arranged in the width direction of the air separation chamber and is positioned below the air separation chamber. The kernels which are about to be discharged from the air separation discharge hole can be sampled from the sampling hole, the content of husks and shells can be tested, and the uniformity of husking in the width direction of the air separation chamber can be judged.

As a further improvement of the utility model, the air pumping chamber is of a wide-upper and narrow-lower structure in the left and right direction. The air outlets of the air separation chambers corresponding to the upper parts are more, and the air quantity is large; the air outlets of the air separation chambers corresponding to the lower parts are few, the air quantity is small, and the air extraction chambers with wide upper parts and narrow lower parts are arranged, so that the air outlet quantity of each air separation chamber is uniform.

As a further improvement of the utility model, the front and the back of the air separation chamber are respectively covered with an air separation chamber sight glass, and the right side wall of the air separation chamber is provided with an air separation chamber sight glass. An operator can observe the air separation effect of the inner cavity of the air separation chamber from top to bottom through the sight glass of the air separation chamber, and a basis is provided for the adjustment of the air inlet of the air separation chamber and the adjustment of the inclination angles of the left inclined plate and the right inclined plate. The air draft chamber sight glass is convenient for observing the state that the separated shell flies upwards in the inner cavity of the air draft chamber.

As the utility model discloses a further improvement, the upper portion and the lower part of air separation chamber sight glass are equipped with the sight glass handle respectively, install a plurality ofly on the flange of air separation chamber and extraction chamber and press the fast depression bar of handle manipulation soon, and the rubber head of each fast depression bar is pressed at the outer terminal surface of air separation chamber sight glass. When the pneumatic separation chamber is in a working state, the quick pressing rods are pressed on the outer end face of the visual mirror of the pneumatic separation chamber, and the visual mirror of the pneumatic separation chamber is pressed on the side wall frame of the pneumatic separation chamber. When the visual mirror of the air separation chamber needs to be disassembled, the quick pressing rods can be quickly separated from the visual mirror of the air separation chamber by pulling the quick pressing handles, and then the visual mirror of the air separation chamber can be easily carried by the visual mirror handles.

As a further improvement, the air inlet and the air outlet of the air separation chamber are provided with three to eight pairs in the height direction of the air separation chamber. The air separation stage number of the air separation chamber can be selected according to the hulling state and the yield requirement of the seeds, and the most common air separation stage number is four to six.

Drawings

The invention will be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

Fig. 1 is a front view of the multistage air classifier of the present invention.

Fig. 2 is a left side view of fig. 1 with the wind outlet removed.

Fig. 3 is a right side view of fig. 1.

Fig. 4 is a top view of fig. 1.

Fig. 5 is a perspective view of fig. 1 with the air outlet removed.

Fig. 6 is a partially enlarged view of fig. 1.

In the figure: 1. rotating the blanking valve; 2. an air separation chamber; 2a, an air inlet of the air separation chamber; 2b, air outlet of the air separation chamber; 2c, winnowing a discharge hole; 2d, a sampling port; 2e, viewing mirror of air separation chamber; 2f, a sight glass handle; 2g, quickly pressing a handle; 2g1. quick-acting lever; 3. an upper left sloping plate; 4. a lower left sloping plate; 5. a right sloping plate; 6. a left sloping plate adjusting screw; 6a, a left inclined plate adjusting seat; 6b, positioning a nut of the left inclined plate; 6c, locking a nut of the left inclined plate; 7. a right swash plate adjusting screw; 7a, a right sloping plate adjusting seat; 7b, a right inclined plate locking nut; 8. an air inlet adjusting plate; 8a, adjusting a knob of the air inlet; 9. an air extraction chamber; 9a, an air extraction chamber sight glass; 10. the wind escapes the shell opening.

Detailed Description

As shown in fig. 1 to 6, the multistage air separator of the present invention includes an air separation chamber 2 extending vertically, a rotary blanking valve 1 is installed at an inlet at the top of the air separation chamber 2, a plurality of air separation chamber air inlets 2a are formed in a left side wall of the air separation chamber 2 from top to bottom, a plurality of air separation chamber air outlets 2b are formed in a right side wall of the air separation chamber 2 from top to bottom, and each air separation chamber air outlet 2b is higher than the opposite air separation chamber air inlet 2 a; the upper edge and the lower edge of the air inlet 2a of each air separation chamber are respectively connected with an upper left inclined plate 3 and a lower left inclined plate 4 which incline rightwards and downwards and are parallel to each other, the upper edge of the air outlet 2b of each air separation chamber is respectively connected with a right inclined plate 5 which inclines leftwards and downwards, the lower edge of each right inclined plate 5 points to the upper part of the left inclined plate, and the bottom of the air separation chamber 2 is provided with an air separation discharge hole 2 c; an air extracting chamber 9 covering the air outlets 2b of the air separating chambers is arranged at the right side of the air separating chamber 2, and an air separating shell opening 10 is connected to the top of the air extracting chamber 9.

The content of peel and shell in the kernels discharged from the kernel-shell separator is about 16%, the kernels are fed into an inlet at the top of the air separation chamber 2 through the rotary blanking valve 1 in an air-closed mode, and the kernels are alternately thrown back and forth between the upper left inclined plate 3 and the right inclined plate 5 in the falling process; meanwhile, fresh air enters the inner cavity of the air separation chamber 2 from the air inlet 2a of each air separation chamber, flows along the space between the upper left inclined plate 3 and the lower left inclined plate 4 towards the right lower part, and forms intersection with the seed kernels scattered from the upper left inclined plate 3 when blowing off towards the right from the lower edge of the upper left inclined plate 3, and the peel and shell in the seed kernels are blown away from the material flow by the air flow and fly upwards towards the right along with the air flow due to lighter weight, fly out from the air outlet 2b of the air separation chamber above, enter the air extraction chamber 9, and are discharged from the air separation shell outlet 10 at the top of the air extraction chamber 9 under the negative pressure suction of the air extraction chamber 9; the winnowed kernels are scattered on the right sloping plate 5 below, and when scattered from the lower edge of the right sloping plate 5, the kernels are crossed with the air flow rising below again, and once again, the hulls are blown away from the material flow; then the seeds are scattered on the upper left inclined plate 3 of the next stage to be winnowed again, so that the seed kernels are winnowed from top to bottom in multiple stages, and the shell content in the seed kernels can reach below 9 percent.

The front and back lateral walls of the air separation chamber 2 are respectively welded with a left inclined plate adjusting seat 6a, each left inclined plate adjusting seat 6a is respectively screwed with a left inclined plate adjusting screw 6, the upper end of the left inclined plate adjusting screw 6 is abutted against the lower part of the upper left inclined plate 3, the left inclined plate adjusting screw 6 is screwed with a left inclined plate positioning nut 6b and a left inclined plate locking nut 6c, the left inclined plate positioning nut 6b is abutted against the lower end face of the lower left inclined plate 4, and the left inclined plate locking nut 6c is abutted against the lower end face of the left inclined plate adjusting seat 6a. The screwing position of the left swash plate positioning nut 6b to the left swash plate adjusting screw 6 determines the distance between the lower left swash plate 4 and the upper left swash plate 3, and normally the lower left swash plate 4 and the upper left swash plate 3 are held in parallel with each other. The screwing position of the left inclined plate locking nut 6c determines the inclination angles of the upper left inclined plate 3 and the lower left inclined plate 4, and the downward sliding speed and the throwing state of the seed kernels are changed, so that the winnowing effect is improved.

The length of the lower left sloping plate 4 is greater than that of the upper left sloping plate 3. In the process of each stage of air separation, when the seeds are scattered from the lower edge of the upper left inclined plate 3, the seeds are subjected to the strongest first blowing of the air flow between the upper left inclined plate 3 and the lower left inclined plate 4; the seeds scattered from the upper left inclined plate 3 are scattered on the lower left inclined plate 4 to form secondary scattering, and are subjected to secondary blowing by the air flow below; when scattering from the lower edge of the lower right inclined plate 5, the air is subjected to third blowing of lower air flow; therefore, the husk is blown three times by each stage of winnowing, and the separation effect is higher.

An air inlet adjusting plate 8 capable of moving up and down is respectively sleeved at the air inlet 2a of each air separation chamber, a plurality of air inlet adjusting knobs 8a are respectively arranged along the length direction of the air inlet adjusting plate 8, the screw rods of the air inlet adjusting knobs 8a are screwed on the left side wall of the air separation chamber 2, a plurality of air inlet adjusting plate vertical grooves are formed in the air inlet adjusting plate 8, and the screw rods of the air inlet adjusting knobs 8a are positioned in the corresponding air inlet adjusting plate vertical grooves. The air inlet adjusting knob 8a is unscrewed, the L-shaped air inlet adjusting plate 8 can move up and down, when the air inlet adjusting plate 8 moves up and down, the width of the air inlet 2a of the air separation chamber is narrowed, and the air inlet amount is reduced; when the air inlet adjusting plate 8 moves downwards, the width of the air inlet 2a of the air separation chamber is widened, and the air inlet amount is increased; the air inlet adjusting plate vertical groove provides an avoiding space for a screw rod of the air inlet adjusting knob 8a, and after the air inlet adjusting knob 8a is adjusted properly, the air inlet adjusting knob 8a is screwed tightly to fix the air inlet adjusting plate 8.

Be equipped with right swash plate adjusting seat 7a on the lateral wall respectively around the selection by winnowing room 2, have connect right swash plate adjusting screw 7 in each right swash plate adjusting seat 7a respectively soon, and the upper end of right swash plate adjusting screw 7 is supported and is leaned on the below at right swash plate 5, and right swash plate adjusting screw 7 top spin has connect right swash plate lock nut 7b, and right swash plate lock nut 7b supports and leans on the lower terminal surface at right swash plate adjusting seat 7a. The right swash plate adjusting screw 7 is screwed in or screwed out of the right swash plate adjusting seat 7a, the inclination angle of the right swash plate 5 can be changed, and the right swash plate locking nut 7b is locked below the right swash plate adjusting seat 7a after the right swash plate adjusting screw is properly adjusted.

The lower part of the right side wall of the air separation chamber 2 is provided with a plurality of sampling ports 2d, and the sampling ports 2d are uniformly arranged in the width direction of the air separation chamber 2 and are positioned below the air extraction chamber 9. The kernels which are about to be discharged from the air separation discharge port 2c can be sampled from the sampling port 2d, the content of the husks and the shells can be tested, and the uniformity of the husking of the air separation chamber 2 in the width direction can be judged.

The air draft chamber 9 is wide at the top and narrow at the bottom in the left-right direction. The air outlets 2b of the air separation chambers corresponding to the upper parts are more, and the air quantity is large; the air outlets 2b of the air separation chambers corresponding to the lower parts are less, the air volume is small, and the air extraction chamber 9 with the wide upper part and the narrow lower part is favorable for the uniform air volume of the air outlet 2b of each air separation chamber.

The front side and the rear side of the air separation chamber 2 are respectively covered with an air separation chamber sight glass 2e, and the right side wall of the air extraction chamber 9 is provided with an air extraction chamber sight glass 9a. An operator can observe the air separation effect from top to bottom of the inner cavity of the air separation chamber through the air separation chamber view mirror 2e, and basis is provided for adjustment of the air inlet 2a of the air separation chamber and adjustment of the inclination angles of the left inclined plate and the right inclined plate. The extraction chamber view mirror 9a facilitates observation of the state of the separated casing flying upward in the inner chamber of the extraction chamber 9.

The upper part and the lower part of the vision mirror 2e of the air separation chamber are respectively provided with a vision mirror handle 2f, and the outer end head of the vision mirror handle 2f is provided with a hand wheel convenient to hold. A plurality of quick-pressing rods 2g1 operated by a quick-pressing handle 2g are arranged on a connecting flange of the air separation chamber 2 and the air extraction chamber 9, and the rubber head of each quick-pressing rod 2g1 is pressed on the outer end surface of the air separation chamber view mirror 2e. In the working state, each quick-pressing rod 2g1 is pressed on the outer end surface of the air separation chamber view mirror 2e, and the air separation chamber view mirror 2e is pressed on the side wall frame of the air separation chamber 2. When the visual mirror 2e of the air separation chamber needs to be disassembled, the quick pressing rods 2g1 can be quickly separated from the visual mirror 2e of the air separation chamber by pulling the quick pressing handles 2g, and then the visual mirror 2e of the air separation chamber can be easily carried by the visual mirror handle 2f.

Three to eight pairs of air inlets 2a and air outlets 2b of the air separation chamber are arranged in the height direction of the air separation chamber. The air separation stage number of the air separation chamber 2 can be selected according to the hulling state and the yield requirement of the seeds, and the most common air separation stage number is four to six.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not described herein again.

Claims (10)

1. A multistage air separator comprises an air separation chamber extending along the vertical direction, and is characterized in that: a rotary blanking valve is installed at an inlet at the top of the air separation chamber, a plurality of air inlet openings of the air separation chamber are formed in the left side wall of the air separation chamber from top to bottom, a plurality of air outlet openings of the air separation chamber are formed in the right side wall of the air separation chamber from top to bottom, and the air outlet openings of the air separation chambers are higher than the air inlet openings of the opposite air separation chamber; the upper edge and the lower edge of the air inlet of each air separation chamber are respectively connected with an upper left inclined plate and a lower left inclined plate which incline rightwards and downwards and are parallel to each other, the upper edge of the air outlet of each air separation chamber is respectively connected with a right inclined plate which inclines leftwards and downwards, the lower edge of each right inclined plate points to the upper part of the left inclined plate, and the bottom of the air separation chamber is provided with an air separation discharge hole; an air extracting chamber covering the air outlets of the air separating chambers is arranged on the right side of the air separating chamber, and an air separating shell opening is connected to the top of the air extracting chamber.

2. The multistage air classifier of claim 1, wherein: the left inclined plate adjusting seats are welded on the front side wall and the rear side wall of the air separation chamber respectively, left inclined plate adjusting screws are screwed in the left inclined plate adjusting seats respectively, the upper ends of the left inclined plate adjusting screws are abutted to the lower portion of the upper left inclined plate, left inclined plate positioning nuts and left inclined plate locking nuts are screwed on the left inclined plate adjusting screws, the left inclined plate positioning nuts are abutted to the lower end face of the lower left inclined plate, and the left inclined plate locking nuts are abutted to the lower end face of the left inclined plate adjusting seats.

3. The multistage air classifier of claim 1, wherein: the length of the lower left sloping plate is greater than that of the upper left sloping plate.

4. The multistage air classifier of claim 1, wherein: air inlet adjusting plates capable of moving up and down are respectively sleeved at air inlets of the air separation chambers, a plurality of air inlet adjusting knobs are respectively arranged along the length direction of the air inlet adjusting plates, screw rods of the air inlet adjusting knobs are screwed on the left side wall of the air separation chambers, a plurality of air inlet adjusting plate vertical grooves are formed in the air inlet adjusting plates, and the screw rods of the air inlet adjusting knobs are positioned in the corresponding air inlet adjusting plate vertical grooves.

5. The multistage air classifier of claim 1, wherein: be equipped with right swash plate on the lateral wall respectively around the air classification room and adjust the seat, have connect right swash plate adjusting screw in each right swash plate adjusting seat respectively soon, and right swash plate adjusting screw's upper end is supported and is leaned on the below at right swash plate, and right swash plate adjusting screw has connect right swash plate lock nut on the top, and right swash plate lock nut supports and leans on the lower terminal surface at right swash plate adjusting seat.

6. The multistage air classifier of claim 1, wherein: the lower part of the right side wall of the air separation chamber is provided with a plurality of sampling ports, and the sampling ports are uniformly arranged in the width direction of the air separation chamber and are positioned below the air extraction chamber.

7. The multistage air classifier of claim 1, wherein: the air pumping chamber is of a structure with a wide upper part and a narrow lower part in the left-right direction.

8. The multistage air classifier according to any one of claims 1 to 7, wherein: the front side and the rear side of the air separation chamber are respectively covered with an air separation chamber sight glass, and the right side wall of the air extraction chamber is provided with an air extraction chamber sight glass.

9. The multistage air classifier of claim 8, wherein: the upper part and the lower part of the visual mirror of the air separation chamber are respectively provided with a visual mirror handle, a plurality of quick pressing rods operated by the quick pressing handles are arranged on a connecting flange of the air separation chamber and the air extraction chamber, and the rubber head of each quick pressing rod is pressed on the outer end surface of the visual mirror of the air separation chamber.

10. The multistage air classifier according to any one of claims 1 to 7, wherein: three to eight pairs of air inlets and air outlets of the air separation chamber are arranged in the height direction of the air separation chamber.

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