CN110918463A

CN110918463A - Screening equipment of rice production and processing

Info

Publication number: CN110918463A
Application number: CN202010002695.2A
Authority: CN
Inventors: 吴迪
Original assignee: Individual
Current assignee: Shandong Jingliang Highway Mach Co ltd
Priority date: 2020-01-02
Filing date: 2020-01-02
Publication date: 2020-03-27
Anticipated expiration: 2040-01-02
Also published as: CN110918463B

Abstract

A screening device for rice production and processing comprises a switch power supply, a motor, a control circuit, a screening device and a power switch; the screening device comprises a frame, an air compressor, an electromagnetic valve and a screening cylinder; the screening cylinder is arranged on the frame, the upper end of the screening cylinder is provided with a conical cover, a discharge pipe, a blanking pipe, an electromagnetic valve, a material groove, a transparent plate and an air inlet pipe, and a plurality of air outlet pipes and a plurality of air inlet pipes of the air compressor are respectively connected together; a shaft lever stirring strip is arranged in the sieving cylinder; the motor is arranged on one side of the frame and is connected with the shaft lever; a material distributing pipe is arranged at the side part of the material discharging pipe, and a front part and a rear part of an opening at the lower side end of the material distributing pipe are respectively provided with a permanent upper magnet; the material distributing pipes are matched with a plurality of blanking pipes, and the front part and the rear part of the upper end of the lower plate at the upper end of each blanking pipe are respectively provided with a strip-shaped lower permanent magnet; a cloth bag is sleeved on the blanking of each blanking pipe; the switch power supply, the control circuit and the power switch are arranged on the circuit board and are electrically connected with the motor and the electromagnetic valve. The invention can achieve good separation effect of rice, rice bran and rice grains.

Description

Screening equipment of rice production and processing

Technical Field

The invention relates to the field of rice fine separation processing equipment, in particular to screening equipment for rice production and processing.

Background

In the rice processing factory, after processing equipment processed millet into rice, the supporting screening plant of processing equipment can sieve out rice and rice bran respectively, and the follow-up packing station packing that gets into of rice, then the rice bran of sieving out sells alone, processes into the fodder as the raw materials of fodder factory etc.. Actually, rice bran sieved after rice processing also contains rice grains with different sizes and particle sizes, the rice bran is different in thickness, and both fine rice bran and coarse rice bran exist. The rice grains have higher economic value, can be used for producing wine and concentrated feed, and various foods and the like prepared by adopting rice as a raw material, so that the direct sale of rice bran containing the rice grains can bring certain influence on the economic benefit of a rice processing factory; meanwhile, the mixed selling of the rice bran with different thicknesses is not beneficial to the graded selling of the rice bran, and the economic benefit of a processing plant is improved. Based on the above, it is especially necessary to provide a rice screening device which is specially used for screening the processed rice and the rice bran, can effectively separate the rice grains and the rice bran in the rice bran according to the grades, and improves the economic benefits of processing enterprises and the like.

Disclosure of Invention

In order to overcome the defects that the existing screening device matched with rice processing equipment cannot separate rice grains and rice bran in rice bran according to grades, and the simultaneous mixed sale of the rice bran and the rice grains is not beneficial to improving the economic benefits of production enterprises, the invention provides a full-automatic rice bran feeding and screening device which has simple and compact structure and good effect, can fully automatically complete the prompting process of feeding to the completion of screening, and in application, the user can randomly and respectively make the screened rice grains and rice bran fall into a plurality of collecting cloth bags according to different weight by conveniently increasing and reducing the transverse distribution number of the blanking pipes and combining with the adjustment of the amount of compressed air entering the screening cylinder, the grain size of the lowest screened rice grains can be set, good rice bran and rice grain sorting effect is achieved, subsequent processing enterprises can sell rice bran and rice grains according to different grain sizes of the rice grains and rice bran fineness after grading treatment, therefore, the screening equipment for rice production and processing can bring greater economic benefits to manufacturers.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a screening device for rice production and processing comprises a switch power supply and a motor, and is characterized by also comprising a control circuit and a screening device; the screening device comprises a rack, an air compressor, an electromagnetic valve and a screening cylinder; the screening cylinder is arranged on the rack, a conical cover and a discharge pipe are arranged at the upper end of the screening cylinder, a blanking pipe is arranged at the lower end of the screening cylinder, and one electromagnetic valve is connected between the blanking pipe and the lower end of the screening cylinder in series; a material groove is arranged at the side end of the screening cylinder, and another electromagnetic valve is arranged between the material groove and the screening cylinder; the front side of the screening cylinder is transversely provided with a transparent plate, the lower end of the screening cylinder is provided with a plurality of air inlet pipes, and a plurality of air outlet pipes and a plurality of air inlet pipes of the air compressor are respectively connected together; a shaft lever stirring strip is arranged in the sieving cylinder; the motor is arranged on one side of the frame and is connected with the shaft lever; a material distributing pipe is arranged on the side part of the material discharging pipe, an opening is formed in the lower side end of the material distributing pipe, and permanent upper magnets are arranged on the front part and the rear part of the lower end of the opening respectively; the distributing pipes are sleeved with a plurality of discharging pipes, the upper end of each discharging pipe is provided with a lower plate, and the front part and the rear part of the upper end of each lower plate are respectively provided with a lower permanent magnet; a cloth bag is sleeved on the blanking pipe of each blanking pipe; the switching power supply, the control circuit and the power switch are installed on the circuit board and are electrically connected with the motor and the electromagnetic valve.

Furthermore, each air inlet pipe is provided with a partition board, and the partition boards are provided with openings.

Furthermore, the left end and the right end of the lower part of the screening cylinder are in an inclined state, the middle of the screening cylinder is low, and the two sides of the screening cylinder are high.

Furthermore, the material distributing pipe is also matched with a plurality of blocking plates with lower fixed permanent magnets at the upper ends, the blocking plates are attracted to the lower end of the upper permanent magnet at the lower end of the connecting plate of the material distributing pipe through the lower fixed permanent magnets and the plurality of material distributing pipes through the lower permanent magnets, and the polarity of the upper permanent magnet is opposite to that of the lower permanent magnet and the lower fixed permanent magnet.

Further, the transverse length and the width of the upper permanent magnet are respectively consistent with the transverse opening length and the width of the connecting plate of the distributing pipe, the opening lengths of the two lower permanent magnets are consistent with the opening length of the lower plate, and the front-back distance of the upper permanent magnet is consistent with the front-back distance of the upper permanent magnet.

Further, the switching power supply is an alternating current to direct current switching power supply module.

Further, the control circuit comprises a resistor, a photodiode, a phototriode, a PNP triode, a loudspeaker and a relay, which are connected through a lead, wherein the photodiode and the phototriode are independently installed on a circuit board, the circuit board is installed in the middle of the rear side in the distributing pipe, the resistor, the PNP triode, the loudspeaker and the relay are installed on the circuit board in the component box, one end of the first resistor is connected with the input end of the control power supply of the first relay and the emitting electrode of the PNP triode, the other end of the first resistor is connected with the anode of the photodiode, the cathode of the photodiode is connected with one end of the second resistor, the collecting electrode of the phototriode is connected with one end of the third resistor, the other end of the third resistor is connected with the base electrode of the PNP triode, the emitting electrode of the phototriode is connected with the sounder, the first, the collector of the PNP triode is connected with the positive power input end of the first relay, and the normally open contact end of the first relay is connected with the loudspeaker and the positive power input end of the second relay.

The invention has the beneficial effects that: before the rice sorting machine is used, rice to be sorted is placed into the sieving cylinder, after compressed air output by the air compressor enters the sieving cylinder, the motor drives the plurality of rectangular stirring strips to rotate at the same time, so that bran and fine rice grains contained in the rice are blown by air and enter the sorting pipe, and the fine rice bran and coarse rice bran have different weights due to different weights of large grains and small grains in the fine rice grains, so that the rice grains and the rice bran entering the sorting pipe can be transversely positioned at different front and rear positions in the sorting pipe under the blowing action of flowing air; according to different weight, the light fine rice bran and rice flour are located at the leftmost side of the material distribution pipe and fall into the lower end collecting cloth bag of the material discharge pipe at the leftmost side, and the rice grains with the largest grain sizes are located at the rightmost side of the material distribution pipe and fall into the lower end collecting cloth bag of the material discharge pipe at the rightmost side, so that the rice bran and rice bran can be automatically classified according to the weight of the rice grains and the rice bran. According to the invention, different numbers of discharging pipes are combined and used as required, and the amount of compressed air entering the sieving cylinder is adjusted, so that rice grains and rice bran which are sieved can randomly and respectively fall into a plurality of collecting cloth bags according to different weight sizes, the lowest particle size of the sieved rice grains can be set, a good rice, rice bran and rice grain sorting effect can be achieved, and rice bran and rice grains can be sold by subsequent processing enterprises according to different particle sizes of the rice bran and rice grains after grading treatment, so that greater economic benefits can be brought to production enterprises. The control circuit of the invention can automatically make sound to prompt a user after the screening is finished, thereby ensuring the continuous production. Based on the above, the invention has good application prospect.

Drawings

The invention is further illustrated below with reference to the figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of the material distributing pipe and one blanking pipe and the blocking plate of the material distributing pipe.

Fig. 3 is a circuit diagram of the present invention.

Detailed Description

As shown in fig. 1 and 2, a screening device for rice production and processing comprises a switching power supply 1, a motor 2, a control circuit 3, a screening device and a power switch 4; the screening device comprises a frame 5, an air compressor,

electromagnetic valves

71 and 72 and a screening cylinder 8; the outer sides of the sieving barrel 8 with the left end, the right end and the lower end of the sieving barrel of a closed structure are arranged at the upper part of the rectangular frame 5 through screw nuts, the upper end of the sieving barrel 8 is an open mechanism, the upper end of the sieving barrel 8 is welded with a conical cover 9, the upper end of the conical cover 9 is small, the lower end of the conical cover is large, and a discharge pipe 10 communicated with the space at the lower part of the conical cover 9 is welded on an opening at the upper middle part of the conical; a blanking pipe 11 is arranged at the lower end of the screening cylinder 8, and a first electromagnetic valve 71 is connected between the blanking pipe 11 and the lower end of the screening cylinder 8 in series; a feeding pipe 12 communicated with the inner space of the screening cylinder is welded at an upper middle part of the right side end of the screening cylinder 8 through an opening, the upper end of the feeding pipe 12 is welded at the lower end of a trough 13 with the lower end being conical and the upper part being an open mechanism, and a second electromagnetic valve 72 is connected in series between the upper end of the feeding pipe 12 and the lower end of the trough 13 through a pipeline and a pipeline joint; a rectangular opening is transversely formed in the front side end of the screening cylinder 8, and a transparent toughened glass plate 81 is fixedly mounted at the front side end of the opening through a screw nut and a mouth-shaped fixing plate (a user can watch the screening condition of the rice in the screening cylinder 8 through the glass plate); twelve rows of air inlet pipes 82 which are communicated with the inner space of the screening cylinder are welded at certain intervals in the transverse direction at the front and back of the lower end of the screening cylinder 8, each row is provided with three air inlet pipes 82, an air compressor is positioned at the right lower end of the screening cylinder 8, the exhaust pipe of the air compressor is welded with thirty-six air outlet pipes 83 in parallel, and thirty-six air outlet pipes 83 and a plurality of air inlet pipes 82 are respectively connected together through hoses; the left side and the right side of the inner middle part of the sieving cylinder 8 are respectively and fixedly provided with a bearing seat 84, a shaft lever 85 is transversely sleeved between the bearings of the two bearing seats 84, the right side of the shaft lever 85 is positioned outside the middle part of the right side end of the sieving cylinder 8, and the upper end and the lower end of the shaft lever 85 are respectively vertically distributed at intervals and transversely welded with sixteen rectangular stirring strips 86; the upper part of the right side end of the frame 5 is welded with a supporting seat 14, the motor 2 is transversely arranged on the supporting seat through a screw nut, and a flange plate of a power output shaft at the left end is connected with a flange plate at the right outer side end of the shaft lever 85 through the screw nut; a material distributing pipe 15 with a closed structure at the left end is transversely welded at the left part of the discharging pipe 10 (the left end is communicated with the space), a coherent rectangular opening 151 is transversely distributed at the lower side end of the material distributing pipe 15 from left to right, and a connecting plate 152 with an opening at the middle part transversely is transversely welded below the rectangular opening; the front part and the rear part of the lower end of the connecting plate 152 are respectively glued with a strip-shaped permanent upper magnet 16; the distributing pipes 15 are matched with ten discharging pipes 17, the upper end of each discharging pipe 17 is transversely welded with a rectangular lower plate 171 with an opening in the middle, and the front part and the rear part of the upper end of each lower plate 171 are respectively adhered with a strip-shaped lower permanent magnet 18; the outer side of the lower end of each blanking pipe 17 is welded with a fixing ring 172, the upper end of the fixing ring 172 of each blanking pipe is sleeved with a cloth bag, the cloth bag is bound and fixed through a rope, and the lower end of the cloth bag is in contact with the ground; the switching power supply 1, the control circuit 3 and the power switch 4 are installed on a circuit board, the circuit board is installed in an element box 19, and the element box 19 is installed at the right end of the front side of the rack 1.

As shown in fig. 1 and 2, a partition plate 82-1 having a plurality of micropores is welded to a lower end portion of each air inlet pipe 82 in the sieving cylinder, and the diameter of the micropores is smaller than the particle size of rice bran and rice grains (preventing the rice bran and the rice grains from entering the air inlet pipe 82). The left end and the right end of the lower part of the sieving cylinder 8 are in an inclined state, the lower end of the middle part of the sieving cylinder 8 is lower, the two ends of the sieving cylinder are higher, and the height of the stirring strips 86 is slightly less than the height from the shaft lever to the bottom in the cylinder body. The branch pipe is also provided with ten rectangular blocking plates 21 (spare) with block-shaped lower fixed permanent magnets at the upper ends, the ten blocking plates 21 are transversely attracted to the lower end of the upper permanent magnet 16 at the lower end of the branch pipe connecting plate through the block-shaped lower fixed permanent magnets 22 and the rectangular lower plates at the upper ends of the plurality of blanking pipes through the lower permanent magnet 18, then an opening 151 at the lower end of the connecting plate is just sealed, and the polarity of the upper permanent magnet 16 is just opposite to that of the lower permanent magnet 18 and the lower fixed permanent magnet 22.

The length of the opening 152 of the connecting plate is consistent with the length of the opening 151 at the lower end of the distributing pipe, the front-back width of the opening is consistent with the front-back spacing at the lower end of the distributing pipe 15, the transverse length and width of the upper permanent magnet 16 are respectively consistent with the length and width of the transverse opening 151 of the connecting plate, the opening lengths of the two lower permanent magnets 18 are consistent with the opening length of the lower plate 171, and the front-back spacing is consistent with the front-back spacing of the upper permanent magnet 16.

As shown in fig. 1 and 3, the switching power supply a is a finished product of a 220V ac to 12V dc switching power supply module with a power of 1 KW. The motor M is an ac motor having an operating voltage of 380V. The control circuit comprises resistors R, R1 and R2, a photodiode VL, a phototriode Q, a PNP triode Q2, a loudspeaker B and a relay K, K1; the device is connected through a lead, wherein an emitting head of a photoelectric diode VL and a light receiving surface of a photoelectric triode Q are welded face to face and independently arranged on a circuit board 20, the circuit board 20 is transversely and fixedly arranged in the middle of the rear side in a material separating pipe 15 through a screw nut, a lead connected with the circuit board is led out through an opening of the rear side end of the material separating pipe 15, the lead and the opening are sealed through sealing glue, a resistor, a PNP triode, a loudspeaker and a relay are arranged on the circuit board in a component box 19, one end of a first resistor R is connected with a control power supply input end of a first relay K and an emitting electrode of the PNP triode Q2, the other end of the first resistor R is connected with the positive electrode of the photoelectric diode VL, the negative electrode of the photoelectric diode VL is connected with one end of a second resistor R1, a collector electrode of the photoelectric triode Q is connected with one end of a third resistor R2, the other end of the third resistor R36, The negative power input end of the second relay K2 and the other end of the second resistor R1 are connected, the collector of the PNP triode Q2 is connected with the positive power input end of the first relay K, and the normally open contact end of the first relay K is connected with the positive power input end of the loudspeaker B and the second relay K2. The power input ends 1 and 2 of a switch power supply A and two poles of an alternating current 220V power supply are respectively connected through leads, the two ends 3 and 4 of the power output of the switch power supply A are respectively connected with one ends of resistors R at the two power input ends of a control circuit and the other ends of the resistors R through leads, the power input ends of a 380V three-phase alternating current power supply and a relay K1 of the control circuit are respectively connected through leads, three normally closed contact ends of a relay K1 are respectively connected with the power input end of a motor M through leads, and the two power input ends of two electromagnetic valves DC1 and DC2 are respectively connected with the two ends 3 and 4 of the power output of the switch power supply A through leads respectively through a power switch S1 and S2.

As shown in fig. 1, 2 and 3, after the 220V ac power enters pins 1 and 2 of the switching power supply a, pins 3 and 4 of the switching power supply a will output a stable 12V dc power into the two power switches S1 and S2 and the two power inputs of the control circuit. According to the invention, a rice and bran mixture to be screened is firstly added into the conical cover 9, then the first power switch S1 is turned on, then the electromagnetic valve DC1 is electrified to work, the inner valve core of the electromagnetic valve is opened, the rice and bran mixture enters the screening cylinder 8, then the power switch S1 is turned off, and the power of the air compressor is turned on. Because the 380V three-phase alternating current power supply is connected with the control power supply input end of the relay K1 of the control circuit, and the three normally closed contact ends of the relay K1 are connected with the power supply input end of the motor M, the motor M can be electrified to work after the 380V power supply switch is opened, and then the screening program can be entered. After the motor M is powered on to work, the shaft lever 85 and the stirring strips 86 are driven to rotate, then thirty-two stirring strips 86 can roll the mixture of rice and bran in the sieving cylinder 8, and at the same time, compressed air output by the air compressor enters the sieving cylinder 8 through thirty-six air inlet pipes 82 and thirty-six air outlet pipes 83 to blow up the mixture of rice and bran in the sieving cylinder 8, and the blown-up height is not high due to the fact that the weight of the whole rice grains is heavy, and the whole rice grains can fall into the sieving cylinder 8 again; light rice grains and rice bran can enter the transversely distributed material distributing pipes 15 through the discharging pipes 10 under the action of wind power, and the light rice bran and rice flour are positioned in the leftmost part of the material distributing pipes 15 and fall into the lower end collecting cloth bag of the leftmost end discharging pipe 17, the light rice bran and rice grains are positioned in the middle part of the material distributing pipes 15 and fall into the lower end collecting cloth bag of the middle lower end discharging pipe 17, the heavy larger rice grains are positioned in the right part of the material distributing pipes 15 and fall into the lower end collecting cloth bag of the right lower end discharging pipe 17, and air is discharged from micropores of the cloth bags, so that the flow of air flow is ensured (in actual conditions, the light rice grains and rice flour, the coarse rice bran, the fine rice grains and the rice grains can be different in weight, can fall into a plurality of blanking pipes at the lower end of the material distributing pipe respectively from left to right, and the sorting effect of the rice grains is particularly optimal). According to the invention, more blanking pipes 17 can be transversely attracted and combined together closely under the material distributing pipe as required, and a plurality of blanking pipes 17 are closer to the lower left part of the material distributing pipe 15 (the connecting plate at the lower end of the material distributing pipe is not attracted to the blanking pipes and is blocked by a plurality of blocking plates 153{ lower fixed magnets } with blocking plate magnets, so that the use is more convenient); then open the exhaust valve of air compressor machine great relatively, because it is bigger to get into the air flow in the screening section of thick bamboo 8, so because the air flow is great relatively, the great grain of rice of relative particle size can obtain the screening as far as possible in the rice and fall into the sack, better separation effect has been reached (more unloading pipe 17 is more by the lower left part of branch material pipe 15, because the air flow grow, lightest fine rice bran and ground rice also can be in relatively more left part in branch material pipe 15, consequently need more by the lower left part of branch material pipe 15 with many unloading pipe 17). The invention can transversely attract a small number of blanking pipes 17 which are combined together closely under the material distributing pipe according to the requirement, and a plurality of blanking pipes 17 are closer to the lower right part of the material distributing pipe 15 (a connecting plate at the lower end of the material distributing pipe does not attract the blanking pipes and is blocked by a plurality of blocking plates 153 with blocking plate magnets, so that the use is more convenient); then it is relatively little to open the air discharge valve of air compressor machine, because it is littleer to get into the interior airflow of screening section of thick bamboo 8, so because airflow is relatively little, the great rice grain of relative particle diameter can no longer obtain the screening in the rice and fall into the sack, better sorting effect has been reached (more the unloading pipe 17 is more by the right part under the unloading pipe 15, because airflow diminishes, the lightest rice bran and ground rice also can be in the more right part in the unloading pipe 15, consequently need more the unloading pipe 17 by the right part under the unloading pipe 15). When the air compressor screening device is used, a user can conveniently adjust the left and right positions of the plurality of discharging pipes 17 attracted below the material distributing pipe 15 through magnet attraction according to needs by an original magnet attraction mode, and the screening effect is adjusted by combining the effect of adjusting the size of the air flow output by the air compressor, so that the use is more convenient.

As shown in fig. 1, 2 and 3, the photodiode VL of the control circuit is powered on and emits infrared light (the resistor R, R1 mainly plays a role of voltage reduction and current limitation), the infrared light irradiates on the light receiving surface of the phototriode Q, when screening is performed, because rice bran and rice grains continuously enter between the photodiode VL and the phototriode Q, thus, because foreign matters continuously pass through the light receiving surfaces of the photodiode VL and the phototriode Q, the infrared light received by the light receiving surface of the phototriode is weakened, the low level output by the collector electrode of the phototriode is reduced in voltage and current limited by the resistor R2, the base voltage of the PNP triode Q1 is lower than the 0.3V initial voltage of the PNP triode Q1, the PNP triode Q1 is in a cut-off state, the collector electrode of the PNP triode Q1 is not output, the relay K is not powered on, the motor M is continuously in a powered working state, and the sorting is ensured (a power switch, in actual use, after rice bran and the like enter the material separating pipe 15 when the motor M works, the power switch is turned on, and the normal work of the motor M is ensured). After sorting is finished, namely rice bran and rice grains do not exist in the rice and enter the material separating pipe 15 through the material discharging pipe 10, at the moment, because the light receiving surfaces of the photodiode VL and the phototriode Q do not have foreign matters to pass through, infrared light received by the light receiving surface of the phototriode Q can be increased, low level output by a collector electrode of the phototriode Q is subjected to voltage reduction and current limitation through the resistor R2, base voltage of the PNP triode Q1 is higher than initial voltage of the PNP triode Q1, the PNP triode Q1 is in a conducting state, the collector electrode of the PNP triode Q1 outputs high level to enter the positive power input end of the relay K, and the relay K is electrified to attract the control power input end; because the positive power supply input end of the relay K1 and the positive power supply input end of the buzzer B are connected with the normally K-open contact end of the relay, the relay K1 can attract the three control power supply input ends and the three normally closed contact ends of the relay to be open at the moment (the buzzer B is electrified to make a loud prompt sound to prompt a user that the screening process is completely finished and the next screening process can be carried out); because the 380V three-phase alternating current power supply is connected with the control power supply input end of the relay K1 of the control circuit, and the three normally closed contact ends of the relay K1 are connected with the power supply input end of the motor M, the motor M can lose power and does not work any more at the moment, so that the purpose of automatic control is achieved, and a user can enter the next screening process. Before entering the next screening process, a user firstly turns on the second power switch S2, then the second electromagnetic valve DC2 is electrified to work, the inner valve core of the second electromagnetic valve DC2 is opened, because the left end and the right end of the lower part of the screening cylinder 8 are in an inclined state, the height of the lower end of the middle part of the screening cylinder 8 is lower than that of the two ends, and the two ends are higher, the rice which is screened with the inner rice grains and the rice bran can be conveyed to the next process through the output pipe through the blanking pipe 11, or directly enters the packaging bag.

As shown in fig. 1, 2 and 3, when the invention is used, rice to be sorted enters the sieving cylinder 8, after compressed air output by the air compressor enters the sieving cylinder 8, the motor 2 drives the rectangular stirring strips 86 to rotate at the same time, so that bran and fine rice grains contained in the rice are blown up by the air and enter the material distributing pipe 15, and because the weight of large grains and small grains in the fine rice grains is different, the weight of the fine rice bran and coarse rice bran in the rice bran is different, so that the rice grains and the rice bran entering the material distributing pipe 15 can be transversely positioned at different front and rear positions in the material distributing pipe under the blowing action of the flowing air; according to different weight, the light fine rice bran and rice flour are located on the leftmost side of the material distribution pipe 15 and fall into the lower end collecting cloth bag of the material discharge pipe at the leftmost end, and the rice grains with the largest grain sizes are located on the rightmost side of the material distribution pipe and fall into the lower end collecting cloth bag of the material discharge pipe at the rightmost end, so that the rice grains and the rice bran can be automatically classified according to the weight of the rice grains and the rice bran. According to the invention, different numbers of the discharging pipes 17 are combined and used as required, and the amount of the compressed air entering the sieving cylinder 8 is adjusted, so that the rice grains and the rice bran which are sieved can be randomly and sequentially dropped into a plurality of collecting cloth bags according to different weights, the grain size of the lowest sieved rice grains can be set, good rice, rice bran and rice grain sorting effect can be achieved, and rice bran and rice grains can be sold by subsequent processing enterprises according to different grain sizes of the rice grains and the rice bran which are subjected to grading treatment, so that greater economic benefit can be brought to production enterprises. The control circuit of the invention can automatically make sound to prompt a user after the screening is finished, thereby ensuring the continuous production. In conclusion, the invention has excellent application prospect. The relay K is a 12V relay of Songle brand; the relay K is a high-power 12V relay with Songle brand; the resistances of the resistors R, R1 and R2 are 1.5K, 3K and 2.34M respectively; the model of the PNP triode Q2 is 9012; the sounder B is a 12V active continuous sound alarm of a wing union brand; photodiode VL model is HG 410; the model of the photoelectric triode Q is 3 DU; the solenoid valves DC1, DC2 are off-center valve spool solenoid valves of the brand deluxe.

While there have been shown and described what are at present considered to be the essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A screening device for rice production and processing comprises a switch power supply and a motor, and is characterized by also comprising a control circuit and a screening device; the screening device comprises a rack, an air compressor, an electromagnetic valve and a screening cylinder; the screening cylinder is arranged on the rack, a conical cover and a discharge pipe are arranged at the upper end of the screening cylinder, a blanking pipe is arranged at the lower end of the screening cylinder, and one electromagnetic valve is connected between the blanking pipe and the lower end of the screening cylinder in series; a material groove is arranged at the side end of the screening cylinder, and another electromagnetic valve is arranged between the material groove and the screening cylinder; the front side of the screening cylinder is transversely provided with a transparent plate, the lower end of the screening cylinder is provided with a plurality of air inlet pipes, and a plurality of air outlet pipes and a plurality of air inlet pipes of the air compressor are respectively connected together; a shaft lever stirring strip is arranged in the sieving cylinder; the motor is arranged on one side of the frame and is connected with the shaft lever; a material distributing pipe is arranged on the side part of the material discharging pipe, an opening is formed in the lower side end of the material distributing pipe, and permanent upper magnets are arranged on the front part and the rear part of the lower end of the opening respectively; the distributing pipes are sleeved with a plurality of discharging pipes, the upper end of each discharging pipe is provided with a lower plate, and the front part and the rear part of the upper end of each lower plate are respectively provided with a lower permanent magnet; a cloth bag is sleeved on the blanking pipe of each blanking pipe; the switching power supply, the control circuit and the power switch are installed on the circuit board and are electrically connected with the motor and the electromagnetic valve.

2. A screening apparatus for rice processing as claimed in claim 1 wherein each air inlet duct has a partition with openings therein.

3. The screening apparatus for rice production and processing according to claim 1, wherein the lower left and right ends of the screening drum are inclined and the middle is lower and the two sides are higher.

4. The screening device for rice production and processing as claimed in claim 1, wherein the distribution pipe is further provided with a plurality of blocking plates having lower fixed permanent magnets at upper ends, the plurality of blocking plates are attracted to the lower end of the upper permanent magnet at the lower end of the connection plate of the distribution pipe through the lower fixed permanent magnets, the plurality of discharging pipes are attracted to the lower end of the upper permanent magnet at the lower end of the connection plate of the distribution pipe through the lower permanent magnets, and the polarity of the upper permanent magnet is opposite to that of the lower permanent magnet and the lower fixed permanent magnet.

5. A screening apparatus for rice production and processing according to claim 1, wherein the transverse length and width of the upper permanent magnet are respectively the same as the transverse opening length and width of the connection plate of the distribution pipe, the opening length of the lower permanent magnets is the same as the opening length of the lower plate, and the front-rear distance is the same as the front-rear distance of the upper permanent magnet.

6. The rice processing and screening apparatus as recited in claim 1, wherein the switching power supply is an ac to dc switching power supply module.

7. The rice processing and screening apparatus as claimed in claim 1, wherein the control circuit comprises a resistor, a photodiode, a photo transistor, a PNP transistor, a speaker and a relay, which are connected by a wire, wherein the photodiode and the photo transistor are separately mounted on a circuit board, the circuit board is mounted in the middle of the rear side of the feed tube, the resistor, the PNP transistor, the speaker and the relay are mounted on the circuit board in the component box, one end of the first resistor is connected to the control power input terminal of the first relay and the emitter of the PNP transistor, the other end of the first resistor is connected to the anode of the photodiode, the cathode of the photodiode is connected to one end of the second resistor, the collector of the photo transistor is connected to one end of the third resistor, the other end of the third resistor is connected to the base of the PNP transistor, the emitter of the photo transistor and the first relay, the emitter of the, The negative power input end of the second relay and the other end of the second resistor are connected, the collector of the PNP triode is connected with the positive power input end of the first relay, and the normally open contact end of the first relay is connected with the loudspeaker and the positive power input end of the second relay.