CN212238182U

CN212238182U - Small-size dry nut frequency conversion multichannel selection by winnowing processing complete sets

Info

Publication number: CN212238182U
Application number: CN202020366392.4U
Authority: CN
Inventors: 朱占江; 杨莉玲; 刘佳; 崔宽波; 沈晓贺; 祝兆帅; 买合木江·巴吐尔; 阿布里孜·巴斯提; 马文强; 孙俪娜; 毛吾兰; 闫圣坤; 刘奎; 田翔
Original assignee: Agricultural Mechanization Research Institute Xinjiang Academy of Agricultural Sciences
Current assignee: Agricultural Mechanization Research Institute Xinjiang Academy of Agricultural Sciences
Priority date: 2020-03-22
Filing date: 2020-03-22
Publication date: 2020-12-29
Anticipated expiration: 2030-03-22

Abstract

The utility model provides a small-size dry nut frequency conversion multichannel selection by winnowing processing complete sets, includes the frame, arranges two selection by winnowing systems in the frame, its characterized in that: the two separation chambers are vertical flat, the settling box is in a shape of an upper cone and a lower cone, the bottom of the funnel is provided with an air lock, and the volume of the settling box is obviously larger than that of the separation chambers; the two separation chambers are respectively positioned on the side walls of the two settling tanks, the upper parts of the separation chambers are provided with openings communicated with the settling tanks, the outer walls of the separation chambers are provided with feed inlets, and the feed limiting and air adjusting mechanisms are arranged on the feed inlets; the two settling tanks are arranged side by side from left to right and staggered up and down, and share a middle partition wall and a middle partition wall of the air outlet channel; a material blocking and air adjusting mechanism is arranged on the first settling tank. The utility model discloses can realize dry nut broken shell backshell, benevolence, the fan-type separation of heart wood and dry nut flat fruit, fruit stalk, other light impurity selection by winnowing, compact structure, the selection by winnowing is effectual.

Description

Small-size dry nut frequency conversion multichannel selection by winnowing processing complete sets

Technical Field

The utility model relates to an agricultural material processing machinery especially relates to an equipment that is used for dry nut broken shell backshell, benevolence, the separation of core wood selection by winnowing and dry nut flat fruit, fruit stalk and other light impurity selection by winnowing, belongs to agricultural machine technical field.

Background

The method comprises the steps of separating shells and kernels of dry nuts after the shells of the dry nuts are broken to obtain clean nuts, separating the shells, the kernels and the split cores of the dry nuts partially containing the split cores after the shells of the dry nuts are broken, mixing shriveled nuts, fruit stalks and other light impurities in the dry nuts, and performing sorting operation. The existing multi-channel dry nut winnowing equipment is generally complex in structure, large in occupied space and high in one-time investment cost, and has large investment pressure on most small enterprises and cooperative society. And current simple machinery generally can not realize the continuous secondary separation to the material, if can not be simultaneously with the shrivelled fruit of dry nut and light impurity separately simultaneously, can not be simultaneously with shell and the diaphragma juglandis that has medicinal value separately simultaneously. The baffle plate in the prior art equipment winnowing settling tank is mostly fixed, can not adjust according to the material condition, and the ability that suits multiple material winnowing remains to improve, and partial winnowing machine settling tank is provided with adjustable fender air register but adjusts inconveniently. The existing sorting equipment is generally provided with a vibration feeder, the machine body has vibration to a certain degree due to the action of the vibration feeder, a fan and other components, a regulating plate of a material feeding port limiting regulating mechanism is easy to loosen, and the firmness is to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a small-size dry nut frequency conversion multichannel selection by winnowing processing complete sets. The winnowing processing complete equipment has the advantages of convenience in adjustment, compact structure and small occupied space, meets the processing requirements of small enterprises and cooperative society, and can separate the shell, kernel and core wood mixed materials of the dry nuts after the shells are broken and separate the shrunken nuts, fruit stalks and other light impurities. The utility model discloses an equipment not only adapts to dry nut class material selection by winnowing, also has better adaptability to other agricultural material selection by winnowing.

The purpose of the utility model is realized like this: the utility model provides a small-size dry nut frequency conversion multichannel selection by winnowing processing complete sets, includes the frame, arranges two air separation systems in the frame, and two air separation systems all include feed mechanism, separation chamber, settling tank, close wind ware and air feed dust pelletizing system, its characterized in that: the two separation chambers are vertical flat, the settling box is in a shape of an upper cone and a lower cone, the bottom of the funnel is provided with an air lock, and the volume of the settling box is obviously larger than that of the separation chambers; the two separation chambers are respectively positioned on the side walls of the two settling tanks, the upper parts of the separation chambers are provided with openings communicated with the settling tanks, the outer walls of the separation chambers are provided with feed inlets, and the feed limiting and air adjusting mechanisms are arranged on the feed inlets; the two settling tanks are arranged side by side from left to right and staggered up and down, and share a middle partition wall and a middle partition wall of the air outlet channel; a material blocking and air adjusting mechanism is arranged on the first settling tank.

The purpose of the utility model can also be realized like this: the material limiting and air adjusting mechanism is fixed on the upper part of a feed inlet on the side wall of the separation cavity and consists of a rotary handle, a rotating shaft, a gear, a fixed seat, an adjustable elastic pressing block and an adjusting plate; the fixed seat is provided with a shaft hole with one open side and two long holes, so that the shaft can be conveniently mounted and dismounted; the adjustable elastic pressing block is fixed on the fixed seat through a bolt, and is provided with a shaft hole, a long clearance hole, a connecting threaded hole and an adjusting threaded hole; the long clearance hole is positioned between the two shaft holes and is communicated with the side walls of the shaft holes, and the adjusting threaded hole penetrates through the long clearance hole; two shaft holes are formed in the upper part of the adjustable elastic pressing block; two rows of long holes are formed in the adjusting plate, each row is composed of a plurality of long holes, and the long holes and the gear form a gear rack mechanism.

The material blocking and air adjusting mechanism consists of a rotating handle, a rotating shaft, a gear, an adjustable elastic pressing block, a fixed material blocking plate and an adjustable material blocking and air adjusting plate; the fixed baffle plate is fixed between two side walls of the settling box, and the rotating handle, the rotating shaft, the gear, the adjustable elastic pressing block and the adjustable baffle air adjusting plate are arranged on one side of the fixed baffle plate, which is close to the air outlet of the settling box; the adjustable material blocking air adjusting plate is designed into a folded plate shape, and the folded plate faces to a middle partition wall shared by the two settling boxes.

The separation cavity side wall on one side of the separation cavity feed inlet is a variable-section air cavity with the separation cavity side wall and the angle (alpha) in the horizontal direction larger than 90 degrees, or the separation cavity section thickness (L2) on the lower portion of the separation cavity side wall is smaller than the variable-section air cavity with the upper portion separation cavity section thickness (L1) by taking the cross section in the middle of the separation cavity feed inlet as a reference.

Two fixed material blocking air adjusting plates are arranged in the second settling tank.

The side wall of the settling tank is provided with a visual window, and silica gel pads are arranged between the visual window cover and the tank wall.

The upper part of the first settling tank is provided with a detachable cover plate.

The air closer power system of the air closer consists of a motor and a belt transmission component; the edges of the rotating blades in the air closer are all fixed with silica gel sheets, and the axial end parts of the rotating blades are also fixed with silica gel sheets.

The air supply dust removal system is composed of a cyclone settler, a variable frequency fan and a collecting bucket, wherein the cyclone settler is connected with the variable frequency fan through flexible connection, the collecting bucket is fixed at the lower part of the cyclone settler, and the power of the variable frequency fan is provided by a variable frequency motor.

The material limiting and air adjusting mechanism is fixed on the upper portion of a feeding port of the side wall of the separation cavity, and a fixed guide rail is arranged on the lower portion of the side wall of the separation cavity.

The feeding machine comprises a feeding hopper, a hopper frame and a vibrating feeding machine, the vibrating feeding machine is positioned on a supporting seat arranged below the hopper frame, a material placing plate is arranged on the upper portion of the hopper frame close to the feeding side, and a material limiting adjusting mechanism is arranged at a discharge port on the lower portion of the feeding hopper; the lifter is a bucket type lifter.

The utility model discloses have following positive beneficial effect: (1) the materials are sorted in multiple channels, the equipment structure is compact, and reference is provided for the miniaturization design of dry nut material sorting equipment. (2) The separation cavity adopts a variable cross-section structure, and the material separation effect is improved. (3) An adjustable material blocking and air adjusting plate is designed in the settling tank, so that the air-separating device can adapt to air separation operation of more materials and different requirements of the same material. (4) The material limiting and air adjusting mechanism of the separation cavity and the material blocking and air adjusting mechanism of the first settling tank adopt gear and rack adjusting mechanisms, the adjustment is convenient, and especially, the adjustable gap elastic pressing block is adopted, so that the adjusting plate is more firmly fixed after adjustment. (5) Thereby can change the selection that the selection of selection by winnowing flow field air current speed size adaptation material according to the change frequency fan rotational speed and then change the selection by winnowing fan air current speed of material condition regulation inverter motor frequency, owing to adopt inverter motor, it is more convenient to adjust. (6) Before the material enters the separation cavity, the material passes through a feeding hopper with a material limiting mechanism and a two-vibration feeding machine, so that the feeding is more uniform, and the winnowing effect is improved. (7) The whole winnowing system runs under a negative pressure state, and the cyclone settler is added behind the air outlet of the fan to ensure that the whole system is relatively closed, so that the adverse effect of light impurities and dust on the environment is avoided.

Drawings

FIG. 1 is a schematic view of a frequency conversion multi-pass winnowing processing complete equipment for small dry nuts.

FIG. 2 is a perspective view of a frequency conversion multi-pass winnowing processing plant for dry nuts. (a) Front view, and (b) back view.

FIG. 3 is a diagram of a preferred embodiment of the separation chamber. (a) Scheme one figure and scheme two figure.

Fig. 4 is a perspective view of a material limiting and air adjusting mechanism of the first separation cavity.

Fig. 5 is a schematic view of an adjustable elastic pressing block.

Figure 6 is a cross-sectional view of the first settling tank. (a) A front sectional view, and (b) a side sectional view.

Figure 7 is a cross-sectional view of the second settling tank.

Fig. 8 is a cross-sectional view of the airlock.

Detailed Description

Legend: 1-a feeder; 2-a hoisting machine; 3-vibrating the feeder I; 4-a frame; 5-material limiting and air adjusting mechanism I; 6-separation chamber I; 7-discharge hopper I; 8-a settling tank I; 9-a material blocking and air adjusting mechanism; 10-a visible window; 11-airlock I; 12-a material guide hopper; 13-vibration feeder II; 14-material limiting and air adjusting mechanism II; 15-separation chamber ii; 16-a vibrating discharging machine; 17-a settling tank II; 18-airlock II; 19-a discharge hopper II; 20-air outlet channel I; 21-variable frequency fan I; 22-cyclone settler I; 23-collecting barrel I; 24-air outlet channel II; 25-variable frequency fan II; 26-cyclone settler II; 27-a collecting bucket II; 28-airlock power system; 29-caster.

Example (b): as shown in fig. 1 and 2, the utility model comprises a feeding machine 1, a lifting machine 2, a vibration feeding machine I3, a frame 4, a material limiting and air adjusting mechanism I5, a separation chamber I6, a discharge hopper I7, a settling tank I8, a material stopping and air adjusting mechanism 9, a visible window 10, an air closing device I11, a material guide hopper 12, a vibration feeding machine II 13, a material limiting and air adjusting mechanism II 14, a separation chamber II 15, a vibration discharge machine 16, a settling tank II 17, an air closing device II 18, a discharge hopper II 19, an air outlet channel I20, a variable frequency fan I21, a cyclone settler I22, a material collecting barrel I23, an air outlet channel II 24, a variable frequency fan II 25, a cyclone settler II 26, a material collecting barrel II 27, an air closing device power system 28 and a caster 29; the device is characterized in that a first winnowing system and a second winnowing system which are independent from each other are formed by a separation cavity I6, a settling box I8, an air lock I11, an air outlet channel I20, a variable frequency fan I21, a cyclone settler I22, a separation cavity II 15, a settling box II 17, an air lock II 18, an air outlet channel II 24, a variable frequency fan II 25 and a cyclone settler II 26; the separation chambers I6 and II 15 are respectively connected with settling tanks I8 and II 17 fixed on the frame 4, and the air lock devices I11 and II 18 are positioned at the lower parts of the corresponding settling tanks I8 and II 17; air inlets of variable frequency fans I21 and II 25 fixed on the rack 4 are respectively connected with settling tanks I8 and II 17 through air outlets I20 and II 24, and air outlets of the variable frequency fans I21 and II 25 are connected with cyclone settlers I22 and II 26 fixed on the front section of the rack; the preferable sedimentation boxes I8 and II 17 and the air outlets I20 and II 24 respectively share a side wall A, B, so that the mutual independence of two air separation systems is ensured, and the equipment space is saved; the mixed materials such as shells, kernels, core-breaking wood and other light impurities such as dust and hair uniformly enter a first winnowing system through a feeding machine 1, a lifting machine 2 and a vibration feeding machine I3, heavy material walnut kernels sink through a discharge hopper I7 and are collected due to the difference of suspension speeds of different materials, air-separated sub-heavy material walnut shells and core-breaking wood enter a sedimentation box I8 through a separation cavity I6, the space of the sedimentation box I8 is sharply enlarged relative to the space of the separation cavity I6, the internal air speed and air pressure are rapidly reduced, relatively heavy material walnut shells and core-breaking wood in the sub-heavy materials sink, the heavy material enters a guide hopper 12 below through an air closer I11 and is guided into a vibration feeding machine II 13 positioned at the lower part of a rack 4, the heavy material is uniformly fed into a second winnowing system again for secondary winnowing, and part of separated light impurities such as dust and hair are uniformly fed through an air outlet channel I20, Settling and collecting by using a variable frequency fan I21 and a cyclone settler I22; after the heavier materials pass through the separation cavity II 15, the walnut shells of the heavier materials sink to fall on a vibrating discharging machine 16, the lower part of the vibrating discharging machine is fixed on the rack 4, the heavy materials are conveyed and collected, the heavy materials enter a settling box II 17 for settling, then pass through an air lock II 18 and a discharging hopper II 19 for collection, and light impurities such as dust, hair and the like separated by air of a secondary air separation system enter a cyclone settler II 26 for settling and collection through an air outlet channel II 24 and a variable frequency fan II 25, so that the mixed materials are subjected to two air separation to separate the walnut kernels, the shells, the diaphragma and other light impurities.

The feeding machine 1 comprises a feeding hopper 101, a hopper frame 102 and a vibrating feeding machine 103, wherein the vibrating feeding machine 103 is located on a supporting seat 1021 arranged below the hopper frame, a material placing plate 1022 is arranged on the upper portion of the hopper frame close to the feeding side, so that a material basket, a bag and the like filled with materials can be conveniently placed, the labor intensity of placing the materials at the manual end in the feeding process is reduced, and a material limiting adjusting mechanism 1011 is arranged at the position of a discharge port on the lower portion of the feeding hopper 101, so that uniform feeding is facilitated.

The preferable scheme of the elevator 2 is a bucket elevator, so that the occupied space is saved.

As shown in fig. 3, a preferable scheme one of the side walls of the separation chambers at the feed inlets of the separation chambers i 6 and ii 15 is that an included angle α between the side wall of the separation chamber and the horizontal direction is slightly larger than 90 degrees to form a variable cross-section air chamber, so that after materials enter the separation chamber, heavy materials such as walnut kernels and original walnuts sink with the decrease of air flow velocity and air pressure, and light materials such as walnut shells, core-split wood and shriveled walnuts rise with the increase of air flow velocity and the increase of air pressure, so as to promote the rapid separation of the materials; the second preferred scheme is that the cross sections of the middle parts of the feeding holes of the separation cavities I6 and II 15 are taken as the reference, the thickness L2 of the cross section of the separation cavity at the lower part of the separation cavity is smaller than the thickness L1 of the cross section of the separation cavity at the upper part of the separation cavity, the separation cavity is also designed into a variable cross section wind cavity, materials are conveniently fed into the middle parts of the cross sections of the separation cavities I6 and II 15, and the.

As shown in fig. 1, 4 and 5, the material limiting and air adjusting mechanism i 5 is fixed on the upper portion of the feed inlet on the side wall of the separation cavity i 6, and is composed of a rotary handle 501, a rotary shaft 502, a gear 503, a fixed seat 504, an adjustable elastic pressing block 505 and an adjusting plate 506; the fixed seat 504 is provided with a shaft hole with one side opened and two long holes, so that the shaft can be conveniently mounted and dismounted; the adjustable elastic pressing block 505 is fixed on the fixed seat 504 through bolts, and the adjustable elastic pressing block 505 is provided with a shaft hole 5051, a long clearance hole 5052, a connecting threaded hole 5053 and an adjusting threaded hole 5054; the strip clearance hole 5052 is located between the two shaft holes 5051 and is communicated with the side wall of the shaft hole 5051, the adjusting threaded hole 5054 penetrates through the strip clearance hole 5052, and the distance between the upper end face and the lower end face of the strip clearance hole 5052 can be changed through the tightness of a bolt fixed at the adjusting threaded hole 5054, so that the rotating shaft 502 is pressed or loosened, and the pressing force on the adjusting plate 506 is adjusted through the gear 503; two shaft holes 5051 are formed in the upper portion of the adjustable elastic pressing block 505, so that the shaft holes can be replaced for continuous use after one shaft hole is worn; two rows of long holes are formed in the adjusting plate 506, each row of long holes is formed by a plurality of long holes, a gear rack mechanism is formed by the long holes and the gear 503, and after the rotating handle 501 is rotated, the gear 503 synchronously rotates to drive the adjusting plate 506 to move up and down, so that the purposes of limiting the feeding amount of the separation cavity I6 and adjusting the wind speed at the feeding port of the separation cavity I6 are achieved.

As shown in fig. 1 and 2, the material limiting and air regulating mechanism ii 14 is fixed on the upper portion of the side wall feed inlet of the separation cavity ii 15, and is different from the material limiting and air regulating mechanism i 5 in that the space where the material limiting and air regulating mechanism ii 14 is located is small, and the side edge of the feed inlet of the separation cavity ii 15 is provided with the air closer power system 28, so that the operation is inconvenient, and therefore, the material limiting and air regulating mechanism ii 14 is preferably designed to be close to the upper portion, so that the interference with the air closer power system 28 is avoided, and the guide rail 1401 is fixed on the lower portion, so that the purpose that the adjustment can be performed by rotating.

As shown in fig. 1, 2 and 6, the material blocking and air adjusting mechanism 9 in the settling box i 8 mainly comprises a rotating handle 901, a rotating shaft 902, a gear 903, an adjustable elastic pressing block 904, a fixed material blocking plate 905 and an adjustable material blocking and air adjusting plate 906; the fixed material baffle 905 is fixed between two side walls of the settling box I8, and in consideration of the movement of materials in the settling box I8, in order to reduce the probability that the materials fall onto the rotating shaft 902 of the material blocking and air adjusting mechanism 9 to influence the use of the material blocking and air adjusting mechanism 9, the rotating handle 901, the rotating shaft 902, the gear 903, the adjustable elastic pressing block 904 and the adjustable material blocking and air adjusting plate 906 are arranged on one side, close to the air outlet of the settling box I8, of the fixed material baffle 905; the difference with the material limiting and air adjusting mechanism I5 is that the preferable fixed seat is replaced by a movable cover plate 907 fixed at the opening of the side wall of the settling box I8 and a side wall reinforcing plate 908 of the settling box I8, and the adjustable material blocking and air adjusting plate 906 is designed into a folded plate shape and faces to the public side wall A; silica gel pads are arranged between the adjustable elastic pressing block 904 and the movable cover plate 907 and between the adjustable elastic pressing block 908 and the side wall reinforcing plate 908 and between the movable cover plate 908 and the side wall of the settling box I8, and therefore the sealing effect is achieved.

As shown in fig. 1 and 7, two fixed baffle air adjusting

plates

1701 and 1702 are arranged in the sedimentation tank ii 17 to stop the air and change the moving direction of the air flow in the sedimentation tank, so that light materials such as walnut diaphragma juglandis and the like sink and are collected, and lighter materials such as hair, dust and the like enter the cyclone settler ii 26 through an air outlet to be collected.

As shown in fig. 1 and 2, visual windows 10 are arranged on the side walls of the settling tanks I8 and II 17, and silica gel pads are arranged between the visual window covers and the tank walls to play a role in sealing; visible window 10 has removed the interior material condition of observation box on the settling box I8, and the apron can be dismantled on the I8 upper portion of cooperation settling box and the convenience is kept off the installation, is maintained of adjusting wind mechanism 9 to the incasement.

As shown in fig. 1, 2 and 8, the airlock power system 28 of the airlock i 11, ii 18 preferably consists of a motor and belt transmission assembly; silica gel sheets are fixed on the edges of the rotating blades 1101 in the air closer I11 and the air closer II 18, and particularly, the silica gel sheets are fixed on the axial end parts of the rotating blades 1101 and are in contact with the end cover of the air closer, so that a good sealing effect can be achieved.

As shown in fig. 1 and 2, cyclone settlers I22 and II 26 are preferably connected with variable frequency fans I21 and II 25 through flexible connections, collecting barrels I23 and II 27 are fixed at the lower parts of the cyclone settlers I22 and II 26, and are used for collecting the discharged materials of the cyclone settlers I22 and II 26; the I21 and II 25 power of the variable frequency fan is provided by a variable frequency motor, and the rotating speed of the variable frequency motor can be conveniently and rapidly adjusted through a frequency converter, so that the aim of conveniently adjusting the wind speed of the winnowing system to adapt to the winnowing requirement of materials is fulfilled.

The utility model discloses obtain better effect through the experiment, experimental use Xinjiang Aksu regional new 2 walnuts as the object, the moisture of benevolence is 6.0% in the experiment walnut primary fruit, and equipment productivity 280kg/h selects preferred scheme a in the separation chamber. Performing air separation operation on the shell and kernel mixed material (the shelled walnut after shell breaking is removed) under the condition of no classification, wherein the shell content of the main indexes after air separation is less than or equal to 3 percent and the kernel content of the shells is less than or equal to 2 percent (the walnut kernels in the shells are rice grain size kernels); the winnowing effect under the condition that the shell and kernel mixed materials are divided into four grades is as follows:

in both cases, the core wood is separated out separately, and other light impurities are collected by a cyclone precipitator.

Claims

1. The utility model provides a small-size dry nut frequency conversion multichannel selection by winnowing processing complete sets, includes the frame, arranges two air separation systems in the frame, and two air separation systems all include feed mechanism, separation chamber, settling tank, close wind ware and air feed dust pelletizing system, its characterized in that: the two separation chambers are vertical flat, the settling box is in a shape of an upper cone and a lower cone, the bottom of the funnel is provided with an air lock, and the volume of the settling box is obviously larger than that of the separation chambers; the two separation chambers are respectively positioned on the side walls of the two settling tanks, the upper parts of the separation chambers are provided with openings communicated with the settling tanks, the outer walls of the separation chambers are provided with feed inlets, and the feed limiting and air adjusting mechanisms are arranged on the feed inlets; the two settling tanks are arranged side by side from left to right and staggered up and down, and share a middle partition wall and a middle partition wall of the air outlet channel; a material blocking and air adjusting mechanism is arranged on the first settling tank.

2. The small dry nut frequency conversion multi-pass air classification processing plant of claim 1, wherein: the material limiting and air adjusting mechanism is fixed on the upper part of a feed inlet on the side wall of the separation cavity and consists of a rotary handle, a rotating shaft, a gear, a fixed seat, an adjustable elastic pressing block and an adjusting plate; the fixed seat is provided with a shaft hole with one open side and two long holes, so that the shaft can be conveniently mounted and dismounted; the adjustable elastic pressing block is fixed on the fixed seat through a bolt, and is provided with a shaft hole, a long clearance hole, a connecting threaded hole and an adjusting threaded hole; the long clearance hole is positioned between the two shaft holes and is communicated with the side walls of the shaft holes, and the adjusting threaded hole penetrates through the long clearance hole; two shaft holes are formed in the upper part of the adjustable elastic pressing block; two rows of long holes are formed in the adjusting plate, each row is composed of a plurality of long holes, and the long holes and the gear form a gear rack mechanism.

3. The small dry nut frequency conversion multi-pass air classification processing plant of claim 1, wherein: the material blocking and air adjusting mechanism consists of a rotating handle, a rotating shaft, a gear, an adjustable elastic pressing block, a fixed material blocking plate and an adjustable material blocking and air adjusting plate; the fixed baffle plate is fixed between two side walls of the settling box, and the rotating handle, the rotating shaft, the gear, the adjustable elastic pressing block and the adjustable baffle air adjusting plate are arranged on one side of the fixed baffle plate, which is close to the air outlet of the settling box; the adjustable material blocking air adjusting plate is designed into a folded plate shape, and the folded plate faces to a middle partition wall shared by the two settling boxes.

4. The small dry nut frequency conversion multi-pass air classification processing plant of claim 1, 2 or 3, wherein: the separation cavity side wall on one side of the separation cavity feed inlet is a variable-section air cavity with the separation cavity side wall and the angle (alpha) in the horizontal direction larger than 90 degrees, or the separation cavity section thickness (L2) on the lower portion of the separation cavity side wall is smaller than the variable-section air cavity with the upper portion separation cavity section thickness (L1) by taking the cross section in the middle of the separation cavity feed inlet as a reference.

5. The small dry nut frequency conversion multi-pass air classification processing plant of claim 1, 2 or 3, wherein: the side wall of the settling tank is provided with a visual window, and silica gel pads are arranged between the visual window cover and the tank wall.

6. The small dry nut frequency conversion multi-pass air classification processing plant of claim 1, 2 or 3, wherein: the air closer power system of the air closer consists of a motor and a belt transmission component; the edges of the rotating blades in the air closer are all fixed with silica gel sheets, and the axial end parts of the rotating blades are also fixed with silica gel sheets.

7. The small dry nut frequency conversion multi-pass air classification processing plant of claim 1, 2 or 3, wherein: the air supply dust removal system is composed of a cyclone settler, a variable frequency fan and a collecting bucket, wherein the cyclone settler is connected with the variable frequency fan through flexible connection, the collecting bucket is fixed at the lower part of the cyclone settler, and the power of the variable frequency fan is provided by a variable frequency motor.

8. The small dry nut frequency conversion multi-pass air classification processing plant of claim 1, 2 or 3, wherein: the material limiting and air adjusting mechanism is fixed on the upper portion of a feeding port of the side wall of the separation cavity, and a fixed guide rail is arranged on the lower portion of the side wall of the separation cavity.

9. The small dry nut frequency conversion multi-pass air classification processing plant of claim 1, wherein: the feeding machine comprises a feeding hopper, a hopper frame and a vibrating feeding machine, the vibrating feeding machine is positioned on a supporting seat arranged below the hopper frame, a material placing plate is arranged on the upper portion of the hopper frame close to the feeding side, and a material limiting adjusting mechanism is arranged at a discharge port on the lower portion of the feeding hopper; the lifter is a bucket type lifter.