CN221413516U - Negative pressure grading cleaning and selecting machine - Google Patents

Abstract

The utility model discloses a negative pressure grading cleaning and selecting machine, which comprises a negative pressure cleaning and selecting bin A, a negative pressure cleaning and selecting bin B, a vibration distributing device, a material control mechanism and a rotary discharging mechanism; the material control mechanisms are arranged at the material inlet of the negative pressure clean bin A and the material inlet of the negative pressure clean bin B, and the rotary material discharging mechanisms are arranged in the material outlet of the negative pressure clean bin A and the material outlet of the negative pressure clean bin B; the light sundries conveyor belt and the vibration distributor are respectively arranged below the discharging opening and the discharging opening of the negative pressure clean bin A, the vibration distributor extends at the feeding opening of the negative pressure clean bin B, and the heavy sundries conveyor belt and the qualified product conveyor belt are respectively arranged at the discharging opening and the discharging opening of the negative pressure clean bin B. The advantages are that: the rotary discharging mechanism is arranged, so that the inside of the separation bin body is in a relatively airtight state, the pressure in the bin is well maintained, and some heavy materials can smoothly enter the bin along with air flow to realize separation. The material control device is arranged, so that the feeding thickness and the feeding quantity of materials can be effectively controlled.

Description

Negative pressure grading cleaning and selecting machine

Technical Field

The utility model relates to the technical field of clean selection, in particular to a negative pressure grading clean selector.

Background

In the processing and production processes of traditional Chinese medicines and foods, impurities and dust doped in materials are removed, and qualified materials are classified, and the impurities and dust doped in the materials and the qualified materials are classified by adopting manual, windmill, blower or cleaning modes.

However, the manual selection mode is low in efficiency and long in time consumption; the method of adopting windmill and air blower is poor in environment, can not grade the involuntary materials, is inapplicable in many scenes by adopting a cleaning method, and is easy to damage the materials and influence the taste of foods and the property and form of medicines even if the materials are removed by adopting the cleaning method, and the subsequent procedures of drying and the like are needed.

In order to avoid the problems, the efficient air separation device is generally used for classifying and screening materials at present, but the existing efficient air separation device also has the following problems:

(1) The material outlet is open or sealed not tightly, has very big influence to wind pressure in the storehouse, amount of wind, leads to some heavier materials unable to get into in the storehouse, can not reach the purpose of separation effectively.

(2) The bin gate mechanism of the existing clean selector drives a gear to rotate by manual rotation of a hand wheel by a person, and drives the bin gate to move up and down through meshing of the gear and a rack.

(3) The problems of mixing materials often occur due to difficult and incomplete cleaning.

Disclosure of utility model

The utility model aims to provide a negative pressure grading cleaner so as to solve the problems in the prior art.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

A negative pressure grading cleaning machine comprises a negative pressure cleaning bin A, a negative pressure cleaning bin B, a vibration distributing device, a material control mechanism and a rotary discharging mechanism; the negative pressure clean bin A and the negative pressure clean bin B are respectively provided with a material control mechanism at the feed inlet, and rotary discharging mechanisms are respectively arranged in the discharge openings of the negative pressure clean bin A and the negative pressure clean bin B; the discharging port of the negative pressure clean bin A is provided with a light sundry conveying belt, the discharging port of the negative pressure clean bin A is provided with a vibration distributing device, the vibration distributing device stretches to the feeding port of the negative pressure clean bin B, the discharging port of the negative pressure clean bin B is provided with a heavy sundry conveying belt, and the discharging port of the negative pressure clean bin B is provided with a qualified product conveying belt.

Preferably, the rotary unloading mechanism comprises an unloading body, an unloading motor and a sealing plate, wherein the unloading body is arranged in the unloading opening, the unloading body is connected with the unloading motor, a plurality of sealing plates extending outwards in a protruding mode in the radial direction are uniformly arranged at intervals in the circumferential direction of the unloading body, and the sealing plates are in contact with the inner wall of the unloading opening.

Preferably, the diameter of the rotary discharge mechanism is greater than the diameter of the discharge opening.

Preferably, the front top shaft and the motor connecting shaft are respectively connected to the two ends of the discharging body, the motor connecting shaft is fixedly connected with the discharging motor, and the front top shaft is arranged on the side wall of the negative pressure clean bin through a bearing.

Preferably, the material control mechanism comprises a material control shaft, a material control plate and a material control fixing part, wherein the material control shaft is parallel to the separating cylinder and is rotatably arranged at the feeding port, the material control plate is arranged on the outer wall of the material control shaft in parallel, and the material control fixing part is connected with the material control shaft and the feeding bin so as to lock the material control shaft at a corresponding position, so that a certain included angle is kept between the material control plate and the feeding port.

Preferably, the negative pressure clean bin is provided with a cleaning opening, the cleaning opening is correspondingly covered with a cleaning window, the cleaning window is rotationally connected to the negative pressure clean bin, and the cleaning window is far away from or close to the cleaning opening so as to open or close the cleaning opening.

Preferably, the negative pressure grading cleaning machine further comprises a cyclone separator, and the air channel of the negative pressure cleaning bin A and the air channel of the negative pressure cleaning bin B are connected with the cyclone separator.

Preferably, the negative pressure classifying cleaner further comprises a dust remover, and the cyclone separator is connected with the dust remover.

Preferably, the transverse length of the negative pressure cleaning bin B is greater than that of the negative pressure cleaning bin A.

Preferably, the negative pressure grading cleaning and selecting machine further comprises a mounting frame, the negative pressure cleaning and selecting bin A and the negative pressure cleaning and selecting bin B are mounted on the upper side of the mounting frame in parallel, the vibration distributing device, the light sundry conveying belt, the heavy sundry conveying belt and the qualified product conveying belt are mounted on the lower side of the mounting frame, the vibration distributing device is located below the negative pressure cleaning and selecting bin A, the light sundry conveying belt is located above the vibration distributing device and below the negative pressure cleaning and selecting bin A, the heavy sundry conveying belt is located obliquely above the vibration distributing device, and the qualified product conveying belt is arranged below the negative pressure cleaning and selecting bin B.

The beneficial effects of the utility model are as follows: 1. the rotary discharging mechanism is arranged at the discharging opening, so that the inside of the negative pressure clean selection bin is in a relatively airtight state, the pressure in the bin is well maintained, some heavy materials can smoothly enter the bin along with air flow to realize separation, and meanwhile, the heavy materials can be discharged out of the bin under the running state of the device. 2. The feeding port is provided with the material control device, so that the feeding thickness and the feeding quantity of materials can be effectively controlled, and the situation that a bin gate mechanism falls off and is blocked due to material extrusion and equipment vibration is avoided. 3. The cleaning window is arranged, and after the cleaning window is opened, the interior of the bin body is conveniently and thoroughly cleaned. 4. The air duct and the rotary unloading mechanism can be integrally and quickly pulled out from the negative pressure clean selection bin to be removed, so that the bin is effectively cleaned, and residues of materials and sundries are avoided. 5. The device realizes the production of materials under the negative pressure state with the outside in the operation process, avoids the flying of dust and sundries everywhere, and ensures better production environment. 6. The cyclone separator and the dust remover are arranged to screen and collect dust discharged from the air duct, so that the clean selection degree of the device is further improved.

Drawings

FIG. 1 is a top view of a negative pressure fractionation cleaner in an embodiment of the present utility model;

FIG. 2 is a front view of a negative pressure fractionation cleaner in an embodiment of the present utility model;

FIG. 3 is a side view of a negative pressure fractionation cleaner in an embodiment of the present utility model;

FIG. 4 is a schematic diagram of the operation of the negative pressure classification cleaning machine in an embodiment of the utility model;

FIG. 5 is a schematic diagram of the structure of a negative pressure clean bin in an embodiment of the utility model;

FIG. 6 is a cross-sectional view of a negative pressure clean bin in an embodiment of the utility model.

In the figure: 1. a dust remover; 2. a cyclone separator; 3. negative pressure cleaning bin A; 301. a bin body fixing plate; 302. an air inlet; 303. a material blocking wall; 304. a guide arc plate; 305. an arcuate rear wall; 306. a discharge wall; 307. a feed inlet; 308. an air duct; 309. a feed opening; 4. a dust removal pipeline; 5. dust; 6. chipping; 7. light impurity materials; 8. heavy impurity materials; 9. qualified materials; 10. vibrating the distributing device; 11. negative pressure clean bin B; 12. a mounting frame; 13. a light sundry conveying belt; 14. heavy sundry conveying belt; 15. a qualified product conveyor belt; 16. a rotary discharge mechanism; 1601. a sealing plate; 1602. sealing the fixing frame; 1603. a discharge body; 17. cleaning the window; 18. a material control mechanism; 1801. a material control plate; 1802. a material control shaft; 1803. and a material control fixing piece.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the utility model.

As shown in fig. 1 to 3, in the present embodiment, there is provided a negative pressure classification cleaning machine including a negative pressure cleaning bin A3, a negative pressure cleaning bin B11, a vibration distributor 10, a material control mechanism 18, and a rotary discharge mechanism 16; the feeding ports 307 of the negative pressure clean bin A3 and the negative pressure clean bin B11 are respectively provided with a material control mechanism 18, and the discharging ports of the negative pressure clean bin A3 and the negative pressure clean bin B11 are respectively provided with a rotary discharging mechanism 16; the light sundries conveyor belt 13 is arranged below the discharging opening of the negative pressure clean bin A3, the vibration distributing device 10 is arranged at the discharging opening 309 of the negative pressure clean bin A3, the vibration distributing device 10 stretches to the feeding opening 307 of the negative pressure clean bin B11, the heavy sundries conveyor belt 14 is arranged at the discharging opening 309 of the negative pressure clean bin B11, and the qualified objects conveyor belt 15 is arranged at the discharging opening of the negative pressure clean bin B11.

As shown in fig. 1 to 3 and fig. 5 to 6, the negative pressure classification cleaner mainly comprises a negative pressure cleaning bin, a vibration distributor 10, a rotary discharging mechanism 16, a material control mechanism 18, a cleaning window 17, a cyclone separator 2, a dust remover 1 and a mounting frame 12; the specific arrangement of each part is as follows:

1. Negative pressure clean selection bin

In this embodiment, two negative pressure cleaning bins A3 and B11 which have the same structure and are connected are arranged in parallel. The negative pressure clean bin comprises a separating cylinder, a feeding cylinder and an air channel 308; the separating cylinder and the feeding cylinder are respectively arranged transversely and longitudinally, the air duct 308 is arranged in the separating cylinder, and the air inlet 302 is arranged on the separating cylinder; the circumferential upper side of the separating cylinder is communicated with the upper end of the feeding cylinder, and the circumferential lower side of the separating cylinder is provided with a discharge opening communicated with the inside of the separating cylinder; the lower extreme of feed cylinder is the feed opening 309, the upside of feed opening 309 is provided with the feed opening 307 with feed cylinder intercommunication.

In this embodiment, the air duct 308 is disposed parallel to the separating cylinder and inside the separating cylinder, and the air duct 308 is inserted from outside to achieve rapid assembly and disassembly.

The separating cylinder comprises a bin body fixing plate 301, a material blocking wall 303, a guide arc plate 304, an arc rear wall 305 and a discharging wall 306; the upper end of the guide arc plate 304 is connected with the upper end of the arc-shaped rear wall 305, the lower end of the arc-shaped rear wall 305 is connected with a first discharging wall 306 which extends vertically downwards, a second discharging wall 306 which is parallel to the first discharging wall 306 is arranged beside the first discharging wall 306 at intervals, the upper end of the second discharging wall 306 is connected with the lower end of the material blocking wall 303, the upper end of the material blocking wall 303 extends towards the direction close to the lower end of the guide arc plate 304, the upper end of the material blocking wall 303 and the lower end of the guide arc plate 304 enclose a connecting port, and the connecting port is correspondingly communicated with the upper end of the feeding cylinder; the first discharge wall 306 and the second discharge wall 306 enclose a discharge opening. The two ends of the cylindrical structure surrounded by the material blocking wall 303, the guide arc plate 304, the arc rear wall 305 and the discharging wall 306 are respectively covered with a bin body fixing plate 301 correspondingly to form a separating cylinder. And all parts of the separating cylinder are welded and connected, so that the stability of connection is ensured. The bin body fixing plate 301 is fixedly connected with the mounting frame 12 to mount the negative pressure cleaning bin on the mounting frame 12.

In this embodiment, the width of the air inlet 302 is smaller than the width of the feeding cylinder. The width of the feed inlet 307 is the same as the width of the air inlet 302.

The negative pressure clean bin is operated according to the principle that materials are fed from a feed port 307, the material control mechanism 18 controls the thickness and the feeding amount of the materials, air flows into the separating drum through an air inlet 302 and moves together with the materials, dust 5 and impurities, the dust 5 and the materials are lighter in weight, the impurities are larger in weight along with the air flows entering the separating drum through the feed drum, and the impurities are directly discharged through a feed port 309 at the lower end of the feed drum. The dust 5 and the impurities change the linear motion into circular motion through the guide arc plate 304, rotate to the material blocking wall 303 through the arc-shaped rear wall 305, and slide down to the rotary discharging mechanism 16 after the material blocking wall 303 blocks the material to strike the material blocking wall 303, so that the dust 5 is sent out of the separating cylinder by the rotary discharging mechanism 16 and is sucked away along with the airflow through the air duct 308 to be discharged out of the negative-pressure clean bin.

2. Vibration distributing device 10

The vibration distributor 10 is used for uniformly feeding the materials discharged from the discharging opening 309 of the negative pressure cleaning bin A3 to the negative pressure cleaning bin B11 for cleaning again.

3. Rotary discharge mechanism 16

In this embodiment, the rotary discharging mechanism 16 includes a discharging body 1603, a discharging motor and a sealing plate 1601, the discharging body 1603 is disposed in the discharging opening, the discharging body 1603 is connected with the discharging motor, a plurality of sealing plates 1601 extending along the radial outward protruding direction of the discharging body 1603 are disposed at uniform intervals in the circumferential direction of the discharging body 1603, and the sealing plates 1601 are in contact with the inner wall of the discharging opening.

In order to facilitate the installation of the sealing plate 1601, a sealing holder 1602 may be provided on the outer wall of the discharge body 1603, and the sealing plate 1601 may be installed on the sealing holder 1602.

In this embodiment, the diameter of the rotary discharge mechanism 16 is greater than the diameter of the discharge opening.

In this embodiment, the front top shaft and the motor connecting shaft are respectively connected to two ends of the discharging body 1603, the motor connecting shaft is fixedly connected with the discharging motor, and the front top shaft is installed on the side wall of the negative pressure clean bin through a bearing.

The diameter of the rotary discharge mechanism 16 is greater than the diameter of the discharge opening. That is, when the rotary discharging mechanism 16 is installed at the discharging opening, the sealing plate 1601 deforms to abut against the inner wall of the discharging opening, so that the negative pressure clean-selecting bin is guaranteed to be in a closed state, the pressure of the negative pressure clean-selecting bin is well guaranteed, some heavy materials can be guaranteed to effectively enter the separating cylinder along with air flow to realize separation, and meanwhile, the materials can be discharged under the running state of the device. The discharge motor acts to drive the discharge body 1603 to rotate via the motor connection shaft, thereby delivering the material out of the separator cartridge.

4. Material control mechanism 18

The material control mechanism 18 comprises a material control shaft 1802, a material control plate 1801 and a material control fixing piece 1803, wherein the material control shaft 1802 is parallel to the separating cylinder and is rotatably arranged at the feeding hole 307, the material control plate 1801 is arranged on the outer wall of the material control shaft 1802 in parallel, and the material control fixing piece 1803 is connected with the material control shaft 1802 and the feeding bin so as to lock the material control shaft 1802 at a corresponding position, so that a certain included angle is kept between the material control plate 1801 and the feeding hole 307.

The rotation of the material control shaft 1802 of the material control device can be controlled electrically or manually, and after the manual control is adjusted to a certain angle, the material control shaft 1802 needs to be fixed on the angle by using the material control fixing piece 1803, so that the included angle between the material control plate 1801 and the material inlet 307 is ensured to be kept at a certain angle, and the thickness and the feeding amount of feeding are controlled. When the electric control is used, the material control shaft 1802 rotates to a certain angle and then automatically self-locks at the angle, so that the included angle between the material control plate 1801 and the feeding port 307 is ensured to be kept at a certain angle, and the thickness and the feeding amount of feeding are controlled.

5. Cleaning window 17

The negative pressure clean bin A3 and the negative pressure clean bin B11 are respectively provided with a cleaning opening, the cleaning openings are correspondingly covered with cleaning windows 17, the cleaning windows 17 are rotationally connected to the separating cylinder, and the cleaning windows 17 are far away from or close to the cleaning openings so as to open or close the cleaning openings. The cleaning window 17 is connected with the separating cylinder through the rotating component, and the rotation of the cleaning window 17 can be realized by driving the rotating component, so that the cleaning window 17 is opened or closed. When the inside of the negative pressure clean bin is required to be cleaned, the cleaning window 17 is opened, the air duct 308 is firstly removed from the negative pressure clean bin, and then the inside of the negative pressure clean bin is cleaned.

6. Cyclone separator 2

The negative pressure classifying and cleaning machine further comprises a cyclone separator 2, and an air duct 308 of the cyclone separator 2 and an air duct 308 of the negative pressure cleaning bin B11 are connected with the cyclone separator 2 through a dust removal pipeline 4. The scraps 6 which are cleaned by the cyclone separator 2 and the negative pressure cleaning bin B11 enter the cyclone separator 2 through the air duct 308 and the dust removing pipeline 4, the cyclone separator 2 carries out secondary separation on the scraps 6, large scraps 6 remain in a waste barrel below the cyclone separator 2, and small scraps 6 enter the dust remover 1 through the dust removing pipeline 4.

7. Dust remover 1

The negative pressure classifying cleaner further comprises a dust remover 1, and the cyclone separator 2 is connected with the dust remover 1 through a dust removing pipeline 4. The filter inside the precipitator 1 filters the small debris 6 so that the small debris 6 is collected in the dust 5 collection bin inside the precipitator 1.

8. Mounting frame 12

The negative pressure grading cleaning machine further comprises a mounting frame 12, the negative pressure cleaning bin A3 and the negative pressure cleaning bin B11 are mounted on the upper side of the mounting frame 12 in parallel, the vibration distributing device 10, the light sundry conveying belt 13, the heavy sundry conveying belt 14 and the qualified object conveying belt 15 are mounted on the lower side of the mounting frame 12, the vibration distributing device 10 is located below the negative pressure cleaning bin A3, the light sundry conveying belt 13 is located above the vibration distributing device 10 and below the negative pressure cleaning bin A3, the heavy sundry conveying belt 14 is located obliquely above the vibration distributing device 10, and the qualified object conveying belt 15 is arranged below the negative pressure cleaning bin B11. The provision of the mounting frame 12 enables the relevant components to be integrated together, improving the integrity and modularity of the device, facilitating installation and movement.

In this embodiment, the lateral length of the negative pressure cleaning bin B11 is greater than the lateral length of the negative pressure cleaning bin A3.

In this embodiment, as shown in fig. 4, the working principle of the negative pressure classification and cleaning machine is as follows: the dust 5 and the light sundries 7 enter a negative pressure clean bin A3 for separation under the action of negative pressure after the flow of the materials is controlled by a material control mechanism 18, the dust 5 and the light sundries 7 are separated under the condition that the suspension speed between the dust 5 and the light sundries 7 is different from the centrifugal force generated at high speed, the light sundries 7 are discharged to the outside of the negative pressure clean bin A3 through a rotary discharging mechanism 16 by rotation, and are conveyed into a collector outside the equipment by a light sundry conveying belt 13; the dust 5 is secondarily separated from the dust removing pipeline 4 through the cyclone separator 2 by the air duct 308, the dust 5 of secondarily separated particles is remained in the waste barrel below the cyclone separator 2, the small particle dust 5 enters the dust remover 1 through the dust removing pipeline 4, and the small particle dust 5 is remained in the dust 5 collecting box inside the dust remover 1 through the filter inside the dust remover 1. The materials discharged from the discharging opening 309 of the negative pressure clean bin A3 fall into the vibration distributing device 10, the materials are uniformly fed into the negative pressure clean bin B11 by the vibration distributing device 10 after being controlled to be thin and thick by the material control mechanism 18, the materials enter the negative pressure clean bin B11 under the action of negative pressure, and heavy impurity materials 8 fall into the heavy impurity conveying belt 14 through the discharging opening 309 of the negative pressure clean bin B11 and are conveyed into a collecting box outside the equipment by the heavy impurity conveying belt 14; the rest materials enter the negative pressure clean bin B11, and the separated qualified materials 9 are discharged onto a qualified material conveyor belt 15 through a rotary discharging mechanism 16 and are transmitted to a collecting box for collection; the scraps 6 are secondarily separated from unqualified materials through the cyclone separator 2 by the air duct 308 and the dust removing pipeline 4, large scraps 6 are left in a waste barrel below the cyclone separator 2, small scraps 6 enter the dust remover 1 through the dust removing pipeline 4, and small scraps 6 are left in a dust 5 collecting box inside the dust remover 1 through a filter inside the dust remover 1.

By adopting the technical scheme disclosed by the utility model, the following beneficial effects are obtained:

The utility model provides a negative pressure grading cleaning and selecting machine, wherein a rotary discharging mechanism is arranged at a discharging opening, so that the inside of a negative pressure cleaning and selecting bin is in a relatively airtight state, the pressure in the bin is well maintained, some heavy materials can smoothly enter the bin along with air flow to realize separation, and meanwhile, the heavy materials can be discharged out of the bin under the running state of the device. The feeding port is provided with the material control device, so that the feeding thickness and the feeding quantity of materials can be effectively controlled, and the situation that a bin gate mechanism falls off and is blocked due to material extrusion and equipment vibration is avoided. The cleaning window is arranged, and after the cleaning window is opened, the interior of the bin body is conveniently and thoroughly cleaned. The air duct and the rotary unloading mechanism can be integrally and quickly pulled out from the negative pressure clean selection bin to be removed, so that the bin is effectively cleaned, and residues of materials and sundries are avoided. The device realizes the production of materials under the negative pressure state with the outside in the operation process, avoids the flying of dust and sundries everywhere, and ensures better production environment. The cyclone separator and the dust remover are arranged to screen and collect dust discharged from the air duct, so that the clean selection degree of the device is further improved.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which is also intended to be covered by the present utility model.

Claims (10)

1. The utility model provides a negative pressure grading cleaning machine which characterized in that: the device comprises a negative pressure clean bin A, a negative pressure clean bin B, a vibration distributing device, a material control mechanism and a rotary discharging mechanism; the negative pressure clean bin A and the negative pressure clean bin B are respectively provided with a material control mechanism at the feed inlet, and rotary discharging mechanisms are respectively arranged in the discharge openings of the negative pressure clean bin A and the negative pressure clean bin B; the discharging port of the negative pressure clean bin A is provided with a light sundry conveying belt, the discharging port of the negative pressure clean bin A is provided with a vibration distributing device, the vibration distributing device stretches to the feeding port of the negative pressure clean bin B, the discharging port of the negative pressure clean bin B is provided with a heavy sundry conveying belt, and the discharging port of the negative pressure clean bin B is provided with a qualified product conveying belt.

2. The negative pressure classification screen machine of claim 1, wherein: the rotary discharging mechanism comprises a discharging body, a discharging motor and a sealing plate, wherein the discharging body is arranged in the discharging opening, the discharging body is connected with the discharging motor, a plurality of sealing plates extending outwards in the radial direction are uniformly arranged at intervals in the circumferential direction of the discharging body, and the sealing plates are in contact with the inner wall of the discharging opening.

3. The negative pressure classification screen machine of claim 2, wherein: the diameter of the rotary discharging mechanism is larger than that of the discharging opening.

4. The negative pressure classification screen machine of claim 2, wherein: the utility model discloses a negative pressure clean bin, including unloading body, motor connecting axle, bearing, negative pressure clean bin, motor connecting axle, front top axle and motor connecting axle are connected with respectively at the both ends of unloading body, motor connecting axle and unloading motor fixed connection, front top axle is installed on the lateral wall of negative pressure clean bin through the bearing.

5. The negative pressure classification screen machine of claim 1, wherein: the material control mechanism comprises a material control shaft, a material control plate and a material control fixing piece, wherein the material control shaft is parallel to a separating cylinder of the negative pressure clean selection bin and is rotatably arranged at the feed inlet, the material control plate is arranged on the outer wall of the material control shaft in parallel, and the material control fixing piece is connected with the material control shaft and the feed inlet so as to lock the material control shaft at a corresponding position, so that a certain included angle is kept between the material control plate and the feed inlet.

6. The negative pressure classification screen machine of claim 1, wherein: the negative pressure clean bin is provided with a cleaning opening, the cleaning opening is correspondingly covered with a cleaning window, the cleaning window is rotationally connected to the negative pressure clean bin, and the cleaning window is far away from or close to the cleaning opening so as to open or close the cleaning opening.

7. The negative pressure classification screen machine of claim 1, wherein: the negative pressure grading cleaning and separating machine further comprises a cyclone separator, and the air duct of the negative pressure cleaning and separating bin A and the air duct of the negative pressure cleaning and separating bin B are connected with the cyclone separator.

8. The negative pressure classification screen machine of claim 7, wherein: the negative pressure grading cleaner further comprises a dust remover, and the cyclone separator is connected with the dust remover.

9. The negative pressure classification screen machine of claim 1, wherein: the transverse length of the negative pressure clean bin B is greater than that of the negative pressure clean bin A.

10. The negative pressure classification screen machine of claim 1, wherein: the negative pressure grading cleaning machine further comprises a mounting frame, the negative pressure cleaning bin A and the negative pressure cleaning bin B are mounted on the upper side of the mounting frame in parallel, the vibration distributing device, the light sundry conveying belt, the heavy sundry conveying belt and the qualified product conveying belt are mounted on the lower side of the mounting frame, the vibration distributing device is located below the negative pressure cleaning bin A, the light sundry conveying belt is located above the vibration distributing device and below the negative pressure cleaning bin A, the heavy sundry conveying belt is located obliquely above the vibration distributing device, and the qualified product conveying belt is arranged below the negative pressure cleaning bin B.