CN111744575A

CN111744575A - Novel wheat screening is used in flour processing device

Info

Publication number: CN111744575A
Application number: CN202010446127.1A
Authority: CN
Inventors: 陈燃
Original assignee: Anhui Tianqi Flour Technology Co ltd
Current assignee: Anhui Tianqi Flour Technology Co ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2020-10-09

Abstract

The invention relates to the technical field of wheat screening machines, and particularly discloses a novel wheat screening device for flour processing; the screening machine comprises a bottom plate, a screening cylinder and a feeding hopper, wherein a plurality of support legs are connected to the lower surface of the screening cylinder, the support legs are fixedly connected to the upper surface of the bottom plate, a plurality of feeding holes are formed in the circle center of the upper surface of the screening cylinder in an annular array, the feeding hopper is arranged at the circle center of the upper surface of the screening cylinder, a cleaning opening is formed in the top wall of the screening cylinder, which is located beside the feeding hopper, a cover plate is rotatably arranged on the cleaning opening, a bearing is arranged at the circle center of the top wall of the screening cylinder, a rotating shaft is welded on the bearing, and; this device can realize simultaneously that its compact structure, area are little to the wheat screening of large granule rubble, tiny particle rubble and shrivelled and vacant shell in the wheat.

Description

Novel wheat screening is used in flour processing device

Technical Field

The invention relates to the technical field of wheat screening machines, and particularly discloses a novel wheat screening device for flour processing.

Background

When wheat is processed into flour, the wheat is firstly filtered and screened, and aims to screen out the empty-shell wheat and broken stones in the wheat. At present, people need pass through the multiple operation screening when screening wheat, and its first screening step utilizes the air separator to get rid of the wheat of shrivelled and vacant shell, then recycles multistage screening machine and loops through the first screen cloth and the second screen cloth that the aperture is different, gets rid of large granule rubble and tiny particle rubble respectively, and its screening step is complicated, and whole set of screening system area is big moreover, equipment composition is high.

For example, the utility model with the patent number of CN208261261U discloses a wheat screening production line, which comprises a crushing device, a first screening device, a second screening device and a grinding device, wherein the crushing device is connected with the first screening device through a first conveying belt mechanism, the first screening device comprises a bracket and a screen body arranged on the bracket through a spring, an upper screen and a lower screen are respectively arranged on the screen body along the up-down direction, the lower end of the lower screen is provided with a wheat grain outlet, the lower part of the lower screen is provided with a sundry bin, the sundry bin is arranged in an inclined manner, and the lower end of the sundry bin is provided with a stone outlet; a second screening device is arranged behind the first screening device through a second conveying belt mechanism, the second screening device comprises a case, a vibrating motor, a screen and a feeding hopper, a vibrating motor electric cabinet is arranged on the case, the feeding hopper is arranged at the top of the case, a distributor is arranged at the bottom of the feeding hopper, three feeding chutes are arranged at the lower part of the distributor, the distributor comprises a first compartment, a second compartment and a third compartment which are uniformly distributed, the three compartments are funnel-shaped, the upper parts of the three compartments are large, the lower parts of the three compartments are small, and a first outlet, a second outlet and a third outlet are respectively arranged at the lower parts of the three compartments; although the wheat screening production line can sequentially realize air separation, primary vibration screening and secondary vibration screening of wheat in the process of screening the wheat, the whole screening step is more, and the whole set of screening equipment occupies a large area and has higher equipment components. Therefore, to the above-mentioned not enough of current wheat screening production line, it is a technical problem that remains to solve to design a equipment small, and can realize simultaneously that it is empty shell, the novel high-efficient sieving mechanism of screening big or small rubble are removed to wheat selection by winnowing.

Disclosure of Invention

The invention aims to overcome the defects of large occupied area and high equipment component of the whole set of screening equipment of the existing wheat screening production line, and designs a novel efficient screening device which has small equipment volume and can simultaneously realize air separation and removal of empty shells and screening of large and small crushed stones for wheat.

The invention is realized by the following technical scheme:

a novel wheat screening device for flour processing comprises a bottom plate, a screening cylinder and a feeding hopper, wherein a plurality of support legs are connected to the lower surface of the screening cylinder, the support legs are fixedly connected to the upper surface of the bottom plate, a plurality of feeding ports are formed in the circle center of the upper surface of the screening cylinder in an annular array, the feeding hopper is arranged in the circle center of the upper surface of the screening cylinder, a cleaning port is formed in the top wall of the screening cylinder beside the feeding hopper, a cover plate is rotatably arranged on the cleaning port, a bearing is arranged in the circle center of the top wall of the screening cylinder, a rotating shaft is welded on the bearing, the lower end of the rotating shaft is connected with a centrifugal sieve tray, a round hole is formed in the circle center of the centrifugal sieve tray, a round platform lug is connected to the centrifugal sieve tray at the upper end of the round hole, a cavity communicated with the, the centrifugal screen disc is provided with a plurality of small gravel sieve holes, the circumferential surface of the centrifugal screen disc is connected with an annular side plate, the upper end of the annular side plate is outwards opened, the annular side plate is provided with a plurality of wheat sieve holes, the inner wall of the circumference of the screening drum at the level of the upper end of the annular side plate is provided with a plurality of sundry blow-out ports in an annular array manner, the outer wall of the screening drum outside the sundry blow-out ports is provided with an annular shell, the lower surface of the annular shell is connected with a plurality of sundry suction pipes, and the lower end of each sundry suction pipe is connected with a spiral separator;

a motor is fixed at the circle center of the bottom wall of the screening cylinder, the output end of the motor is connected with a first rotating rod, a fan blade is arranged on the first rotating rod, an air supply pipe is fixed above the motor, the upper end of the air supply pipe is aligned with the round hole on the centrifugal sieve tray, a gap is reserved between the upper end of the air supply pipe and the round hole, a reduction box is fixed in the middle of the blast pipe, the upper end of the first rotating rod is connected with the reduction box, the upper end of the reduction gearbox is connected with a second rotating rod, the top end of the second rotating rod penetrates through the air supply pipe to be connected with the top wall of the circular truncated cone convex block, an annular baffle is arranged on the bottom wall of the screening cylinder positioned at the outer circumferential surface of the centrifugal screen disc, a plurality of wheat discharge ports are formed in the bottom wall of the screening cylinder positioned between the inner circumferential wall of the screening cylinder and the annular baffle, and a plurality of small crushed stone discharge ports are formed in the bottom wall of the screening cylinder positioned on the inner side of the annular baffle.

As a further arrangement of the scheme, a conical block is arranged in the feed hopper, a plurality of triangular prism blocks are connected between the conical block and the inner wall of the feed hopper in an annular array shape, and a feed opening corresponding to each feed opening is formed between every two adjacent triangular prism blocks; the wheat to be screened which is added can uniformly fall on the centrifugal sieve tray through each feed inlet through the conical blocks and the triangular prism blocks which are arranged in the feed hopper.

As a further arrangement of the scheme, the outer end of the air blowing pipe is obliquely arranged upwards at an angle of 15-20 degrees; the outer end of the air blowing pipe is arranged at an upward inclined angle in a reasonable range, and the wheat which is shriveled and has a hollow shell on the upper surface of the centrifugal sieve tray can be blown up and then blown into the sundries blowing port.

According to the scheme, the upper end of the annular side plate is outwards opened, and the included angle between the upper end of the annular side plate and the horizontal plane is 30-60 degrees; the reasonable setting of its annular curb plate opening angle for receive centrifugal force to be close to the wheat of annular curb plate and fall from the wheat sieve mesh, and its angle can make the wheat of shrivelled and empty shell that blows up can be blown into in the debris blowout port and do not receive the hindrance.

As a further arrangement of the scheme, a plurality of small gravel sieve holes are arranged on the centrifugal sieve tray far away from the circular truncated cone bump in an annular array; through setting up little rubble sieve mesh on keeping away from the centrifugal sieve dish of round platform lug, its wheat that falls rolls to annular curb plate department under the effect of its centrifugal force, and little rubble is less at the rolling in-process through can being in the bottommost layer of centrifugal sieve dish upper surface because of the particle diameter, then sees through little rubble sieve mesh at outside rolling in-process, realizes the little rubble separation in the wheat.

As a further arrangement of the scheme, the blast pipe comprises a lower air inlet pipe section and an upper reinforcing pipe section, the lower air inlet pipe section and the upper reinforcing pipe section are connected through a circular truncated cone pipe section, and the diameter of the lower air inlet pipe section is larger than that of the upper reinforcing pipe section; with the above-mentioned design of blast pipe for because the pipe diameter diminishes when the style of blowing into gets into the upper end, its velocity of flow increases, then the air current after strengthening blows off from the gas blow pipe again, can guarantee that the air current after strengthening can blow up the wheat of shrivelled and vacant shell.

As a further arrangement of the above scheme, the reduction gearbox comprises a box body, a transmission shaft, a lower large gear and an upper small gear, wherein the upper end and the lower end of the transmission shaft are rotatably arranged at the left end inside the box body, the lower large gear is arranged at the lower end of the transmission shaft, the small gear is arranged at the upper end of the transmission shaft, a driving gear meshed with the lower large gear is arranged at the top end of the first rotating rod, which extends into the box body, and a driven gear meshed with the upper small gear is arranged at the bottom end of the second rotating rod, which extends into the box body; through the reasonable reduction ratio of the reduction gearbox, the centrifugal force of the centrifugal sieve tray is in a reasonable range when the fan blade is ensured to be sent into strong enough airflow.

As a further arrangement of the scheme, a first material guide block is arranged between two adjacent wheat discharge ports, a second material guide block is arranged between two adjacent small crushed stone discharge ports, the first material guide block and the second material guide block are both in a triangular arc shape, and the top end of the triangular arc shape is a sharp ridge line; through the first guide block and the second guide block, fallen wheat and small crushed stones can smoothly fall from the wheat outlet and the crushed stone outlet respectively.

Has the advantages that:

1. compared with the prior art, the wheat to be screened is discharged into the circle center side of the centrifugal sieve tray, then the centrifugal sieve tray is driven by the motor to be in a reasonable rotating speed range, the wheat falling on the upper surface of the centrifugal sieve tray rolls around under the action of centrifugal force, the wheat is uniformly spread in the process of rolling to the annular side plate, crushed stones with small particle sizes can be positioned at the bottommost layer through gaps among the wheat, and then screening is carried out through small crushed stone sieve holes in the process of rolling around; meanwhile, the wheat which is shriveled and empty can roll to the uppermost layer due to low density in the process of rolling around, then is blown into the sundries blowing outlet along the upper end of the annular side plate under the action of the airflow discharged from the air blowing pipe, and is settled in the separator under the action of the negative pressure adsorption of the spiral separator; meanwhile, the full-grain wheat rolls to the outermost end of the centrifugal sieve tray, then rolls upwards along the annular side plate, finally falls through the wheat sieve pores, and large-grain crushed stones cannot pass through the wheat sieve pores and finally roll into the sundries blowing-out port; this device can realize simultaneously that its compact structure, area are little to the wheat screening of large granule rubble, tiny particle rubble and shrivelled and vacant shell in the wheat.

2. The invention can realize the air supply and the rotation driving of the centrifugal sieve tray through one motor, and the wheat on the centrifugal sieve tray can realize the sieving of various impurities in the process of rolling under the centrifugal force, so that the invention has the advantages of simple sieving step, excellent sieving effect, lower manufacturing cost of the whole set of equipment and stronger practicability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of the feed hopper of the present invention;

FIG. 3 is a front view of the internal plan structure of the present invention;

FIG. 4 is a three-dimensional structure view of a centrifugal screen tray and an annular side plate in the invention;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 3;

FIG. 6 is an interior plan view of the reduction gearbox of the present invention;

FIG. 7 is a perspective view of the lower end of the screen cylinder in example 2;

fig. 8 is a perspective view of a first material guide block according to embodiment 2.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", and,

The terms "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like, refer to an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to the accompanying drawings 1 to 8, in conjunction with the embodiments.

Example 1

Example 1 describes a novel wheat screening apparatus for flour processing, which rotates a centrifugal screen plate to roll wheat to be screened all around, and then realizes multi-stage screening through screen holes with different diameters and different wind forces, and the apparatus is specifically described below with reference to the accompanying drawings.

Referring to the attached drawings 1 and 2, the main structure of the screening drum comprises a bottom plate 1, a screening drum 2 and a feeding hopper 3, wherein four support legs 4 are connected to the lower surface of the screening drum 2, the support legs 4 are fixedly connected to the upper surface of the bottom plate 1, five feeding holes 201 are formed in the circle center of the upper surface of the screening drum 2 in an annular array mode, and the feeding hopper 3 is arranged at the circle center of the upper surface of the screening drum 2. In order to enable the wheat to be screened in the feeding hopper 3 to uniformly fall into each feeding hole 201, a conical block 301 is further arranged in the feeding hopper 3, five triangular prism blocks 302 are connected between the conical block 301 and the inner wall of the feeding hopper 3 in an annular array shape, and a feeding hole corresponding to each feeding hole 201 is formed between every two adjacent triangular prism blocks 302. Meanwhile, a cleaning opening 202 is formed in the top wall of the screening drum 2 and located beside the feeding hopper 3, a cover plate 5 is rotatably arranged on the cleaning opening 202, and a handle (not marked in the drawing) convenient to open is further arranged on the cover plate 5.

Referring to fig. 3 and 4, a bearing 203 is arranged at the center of a circle of the top wall of the screening cylinder 2, a rotating shaft 6 is welded in an inner ring of the bearing 203, a centrifugal sieve tray 7 is connected to the lower end of the rotating shaft 6, a circular hole is formed in the center of the circle of the centrifugal sieve tray 7, a circular boss bump 8 is connected to the centrifugal sieve tray 7 at the upper end of the circular hole, the lower end of the rotating shaft 6 is welded to the upper surface of the circular boss bump 8, a cavity 801 communicated with the circular hole is formed in the lower end of the circular boss bump 8, a plurality of air blowing pipes 802 are uniformly connected to the circumferential surface of the circular boss bump 801, eight air blowing pipes 802 are arranged in the embodiment, and the outer end of each air. In that

A plurality of small gravel sieve holes 701 are formed in the centrifugal sieve tray 7, and when the small gravel sieve holes 701 are specifically arranged, the small gravel sieve holes are arranged on the centrifugal sieve tray 7 far away from the circular truncated cone convex blocks 8 in an annular array mode. An annular side plate 9 is connected to the outer circumferential surface of the centrifugal screen tray 7, the upper end of the annular side plate 9 is outwards opened, and the included angle between the opening angle of the annular side plate and the horizontal plane is 45 degrees. Meanwhile, a plurality of wheat sieve pores 901 are formed in the annular side plate 9, wherein the diameter of each small gravel sieve pore 701 is smaller than that of the full wheat, and the diameter of each wheat sieve pore 901 is slightly larger than that of the full wheat. Referring to fig. 1, fig. 3 and fig. 5, six sundries blowing-out openings 204 are arranged in a circular array on the inner wall of the circumference of the screen cylinder 2 at the level of the upper end of the circular side plate 9, an annular housing 10 is arranged on the outer wall of the screen cylinder 2 at the outer side of the sundries blowing-out openings 204, three sundries suction pipes 101 are connected to the lower surface of the annular housing 10, and then the lower ends of the three sundries suction pipes 101 and the same spiral separator (not shown in the figure) are connected, and the spiral separator is the prior art, so the detailed description is not provided here.

Referring to fig. 3, a motor 11 is fixed at the center of the bottom wall of the screen cylinder 2, the output end of the motor 11 is connected with a first rotating rod 12, and a fan blade 13 is arranged on the first rotating rod 12, and the fan blade 13 can generate upward wind force when rotating along with the first rotating rod 12. An air supply pipe 14 is fixed above the motor 11, the upper end of the air supply pipe 14 is aligned with the round hole on the centrifugal screen disc 7, and a gap which is not more than 10mm is reserved between the air supply pipe and the round hole. A reduction box 15 is arranged in the middle of the blast pipe 14, and the reduction box 15 is welded and fixed with the inside of the blast pipe 14 through a welding strip on one side. Specifically, referring to fig. 6, the reduction box 15 includes a box 151, a transmission shaft 152, a lower large gear 153 and an upper small gear 154, the upper and lower ends of the transmission shaft 152 are rotatably disposed at the left end inside the box 151, a lower large gear 153 is provided at the lower end of the driving shaft 152, a small gear 154 is provided at the upper end of the driving shaft 152, the top end of the first rotating rod 12 extending into the box body 151 is provided with a driving gear 155 engaged with the lower big gear 153, the upper end of the reduction box 15 is connected with a second rotating rod 16, the bottom end of the second rotating rod 16 extending into the case 151 is provided with a driven gear 156 engaged with the upper pinion 154, then the top end of the second rotating rod 16 passes through the blast pipe 14 to be connected with the top wall of the circular truncated cone bump 8, through the reasonable reduction ratio of the reduction gearbox 15, the centrifugal force of the centrifugal screen disc 7 is in a reasonable range when the fan blades 13 are ensured to send into strong enough airflow.

Finally, referring to fig. 3, an annular baffle 17 is disposed on the bottom wall of the screening cylinder 2 located at the outer circumferential surface of the centrifugal screen tray 7, the annular baffle 17 divides the screening cylinder 2 below the centrifugal screen tray 7 into two sections, a plurality of wheat discharge ports 205 are disposed on the bottom wall of the screening cylinder 2 located between the inner circumferential wall of the screening cylinder 2 and the annular baffle 17, and a plurality of small crushed stone discharge ports 206 are disposed on the bottom wall of the screening cylinder 2 located inside the annular baffle 17.

Example 2

The embodiment 2 is a further improvement on the basis of the embodiment 1, and mainly improves the blast pipe 14 and the discharge mode of the small crushed stone discharge port 206 and the wheat discharge port 205. This is explained in detail below:

the embodiment 2 is the same as the embodiment 1 and will not be described again, but the embodiment is different in that the air supply duct 14 is designed in sections, referring to fig. 3, the air supply duct 14 in the embodiment includes a lower air inlet duct section 141 and an upper reinforcing duct section 142, wherein the lower air inlet duct section 141 and the upper reinforcing duct section 142 are connected by a circular truncated cone section 143, and the diameter of the lower air inlet duct section 141 is larger than that of the upper reinforcing duct section 142, so that the fan blades 13 and the reduction gearbox 15 are designed inside the lower air inlet duct section 141 during design, and the outer wall of the upper reinforcing duct section 142 is also connected with a welding strip (not shown in the figure), and the welding strip is welded and fixed with the inside of the annular baffle 17. Embodiment 2 with the above design of the blast pipe 14, when the blown-in air body enters the upper end, the flow velocity is increased because the pipe diameter is reduced, and then the reinforced air flow is blown out from the air blowing pipe, so that the reinforced air flow can blow the wheat which is shriveled and is empty.

Referring to fig. 3 and 7, a first material guiding block 18 is disposed between two adjacent wheat discharge ports 205, a second material guiding block 19 is disposed between two adjacent small crushed stone discharge ports 206, and both the first material guiding block 18 and the second material guiding block 19 are in a triangular arc shape (refer to fig. 8), and the top end of the triangular arc shape is a sharp ridge; when the screened wheat falls on the first material guide block 18, the wheat slides down to the wheat discharge port 205 along the inclined planes at the two ends of the first material guide block 18; meanwhile, the fallen small crushed stones slide down to the small crushed stone discharge port 206 along the inclined planes at the two ends of the second material guide block 19. In the embodiment, the first material guide block 18 and the second material guide block 19 are designed to realize centralized blanking of each wheat discharge port 205 or small crushed stone discharge port 206, so that the wheat discharge ports or small crushed stone discharge ports can be conveniently received.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel wheat screening device for flour processing comprises a bottom plate, a screening cylinder and a feed hopper, wherein a plurality of support legs are connected to the lower surface of the screening cylinder, and are fixedly connected to the upper surface of the bottom plate, the wheat screening device is characterized in that a plurality of feed inlets are formed in the circle center of the upper surface of the screening cylinder in an annular array, the feed hopper is arranged in the circle center of the upper surface of the screening cylinder, a cleaning opening is formed in the top wall of the screening cylinder beside the feed hopper, a cover plate is rotatably arranged on the cleaning opening, a bearing is arranged in the circle center of the top wall of the screening cylinder, a rotating shaft is welded on the bearing, the lower end of the rotating shaft is connected with a centrifugal sieve tray, a round hole is formed in the circle center of the centrifugal sieve tray, a round boss is connected to the centrifugal sieve tray at the upper end of the round hole, a cavity communicated with, the centrifugal screen disc is provided with a plurality of small gravel sieve holes, the circumferential surface of the centrifugal screen disc is connected with an annular side plate, the upper end of the annular side plate is outwards opened, the annular side plate is provided with a plurality of wheat sieve holes, the inner wall of the circumference of the screening drum at the level of the upper end of the annular side plate is provided with a plurality of sundry blow-out ports in an annular array manner, the outer wall of the screening drum outside the sundry blow-out ports is provided with an annular shell, the lower surface of the annular shell is connected with a plurality of sundry suction pipes, and the lower end of each sundry suction pipe is connected with a spiral separator;

2. The novel wheat screening device for flour processing as claimed in claim 1, wherein a conical block is arranged in the feed hopper, a plurality of triangular prism blocks are connected between the conical block and the inner wall of the feed hopper in an annular array, and a feed opening corresponding to each feed opening is formed between adjacent triangular prism blocks.

3. The novel wheat screening device for flour processing as claimed in claim 1, wherein the outer end of the air blowing pipe is inclined upwards at an angle of 15-20 degrees.

4. The novel wheat screening device for flour processing as claimed in claim 3, wherein the upper end of the annular side plate is flared outward and has an included angle with the horizontal plane within a range of 30-60 °.

5. The new wheat screening device for flour processing as claimed in claim 1, wherein a plurality of said small crushed stone sieve holes are opened in a circular array on the centrifugal sieve tray away from the circular truncated cone convex block.

6. The novel wheat screening device for flour processing as claimed in claim 1, wherein the blast pipe comprises a lower air inlet pipe section and an upper reinforcing pipe section, the lower air inlet pipe section and the upper reinforcing pipe section are connected through a circular truncated cone pipe section, and the diameter of the lower air inlet pipe section is larger than that of the upper reinforcing pipe section.

7. The novel wheat screening device for flour processing as claimed in claim 1, wherein the reduction box comprises a box body, a transmission shaft, a lower gearwheel and an upper pinion, the upper end and the lower end of the transmission shaft are rotatably arranged at the left end inside the box body, the lower gearwheel is arranged at the lower end of the transmission shaft, the pinion is arranged at the upper end of the transmission shaft, a driving gear meshed with the lower gearwheel is arranged at the top end of the first rotating rod extending into the box body, and a driven gear meshed with the upper pinion is arranged at the bottom end of the second rotating rod extending into the box body.

8. The novel wheat screening device for flour processing as claimed in claim 1, wherein a first material guiding block is arranged between two adjacent wheat discharge ports, a second material guiding block is arranged between two adjacent small crushed stone discharge ports, the first material guiding block and the second material guiding block are both in a triangular arc shape, and the top end of the triangular arc shape is a sharp ridge line.