CN111889369A - Continuous-rotation continuous-blowing dredging method for cylinder of traditional Chinese medicine sieving machine - Google Patents
Continuous-rotation continuous-blowing dredging method for cylinder of traditional Chinese medicine sieving machine Download PDFInfo
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- CN111889369A CN111889369A CN202010822747.0A CN202010822747A CN111889369A CN 111889369 A CN111889369 A CN 111889369A CN 202010822747 A CN202010822747 A CN 202010822747A CN 111889369 A CN111889369 A CN 111889369A
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- barrel
- push rod
- sieve
- sieve mesh
- traditional chinese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
- B07B1/52—Cleaning with brushes or scrapers
- B07B1/522—Cleaning with brushes or scrapers with brushes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
- B07B1/22—Revolving drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
- B07B1/55—Cleaning with fluid jets
Abstract
The invention relates to a continuous rotation and continuous blowing type dredging method for a barrel of a traditional Chinese medicine sieving machine, wherein in the continuous rotation process of the barrel, air blown out of an air blowing hole blows traditional Chinese medicine decoction pieces blocked in a sieve mesh into the barrel to play a role in dredging the sieve mesh, a push rod pushes the part, extending out of the sieve mesh, of the traditional Chinese medicine decoction pieces, which extend out of the sieve mesh and are toppled towards the front of the rotation direction of the barrel, towards the rear of the rotation direction of the barrel, so that the traditional Chinese medicine decoction pieces, which extend out of the sieve mesh and are toppled towards the front of the rotation direction of the barrel when the push rod reaches the edge of the sieve mesh, are converted into the traditional Chinese medicine decoction pieces, which extend out of the sieve mesh and are toppled towards the. The invention has the advantage that the sieve can be dredged without stopping, and solves the problem of labor waste in the process of manually dredging the drum sieve in the production process of traditional Chinese medicines.
Description
Technical Field
The invention belongs to the technical field of production of traditional Chinese medicine preparations, and particularly relates to a continuous rotating and air blowing type dredging method for a cylinder of a traditional Chinese medicine sieving machine.
Background
In the production process of traditional Chinese medicine, the sliced traditional Chinese medicine decoction pieces are sometimes required to be screened, and the traditional Chinese medicine decoction pieces with granularity which does not meet the requirement are screened out and then subjected to secondary crushing treatment so as to enable the sizes of the traditional Chinese medicine decoction pieces to meet the requirement. The traditional Chinese medicine screening is finished by manually screening through a sieve, and is changed into screening through a drum sieve, but the traditional drum sieve needs to manually dredge sieve pores after blockage is generated in the traditional Chinese medicine screening process, so that inconvenience is caused when the sieve pores are dredged.
Disclosure of Invention
The invention provides a continuous rotating and air blowing type dredging method for a cylinder of a traditional Chinese medicine sieving machine, which can be dredged without stopping a sieve, and solves the problem of labor waste in the process of manually dredging a drum sieve in the production process of traditional Chinese medicines.
The technical problem is solved by the following technical scheme: a continuous rotation and continuous blowing type dredging method for a barrel of a traditional Chinese medicine screening machine is characterized by comprising a rack, a barrel and a push rod, wherein a driving rotating shaft which is obliquely arranged is rotatably connected to the rack, the barrel is coaxially sleeved on the driving rotating shaft and is fixed together with the driving rotating shaft, the barrel is circular, a plurality of rows of sieve mesh rows which are distributed along the axial direction of the barrel are arranged on the circumferential surface of the barrel, a plurality of sieve meshes which are distributed along the circumferential direction of the barrel are arranged on each row of sieve mesh rows, the outer circumferential surface of the barrel is a smooth surface, the push rod extends from one end to the other end of the barrel, the push rod is used for pushing the part, extending out of the sieve meshes, of traditional Chinese medicine decoction pieces which extend out of the sieve mesh parts and are poured towards the front of the rotation direction of the barrel towards the rear of the rotation direction of the barrel, the side surface of the push rod positioned at the rear end in the rotating direction of the cylinder body is a plane, the gas distribution cavity is provided with a plurality of gas blowing holes distributed along the extending direction of the push rod, the gas blowing holes are positioned on the surface of the end plate facing the side of the cylinder body, the opening direction of the gas blowing holes is parallel to the side surface of the push rod positioned at the rear end in the rotating direction of the cylinder body, the cylinder body rotates until the sieve holes are aligned with the sieve holes in a one-to-one correspondence manner on the plane of the side surface of the push rod positioned at the rear end in the rotating direction of the cylinder body when the edge of the sieve holes positioned at the front end in the rotating direction of the cylinder body is positioned on the plane of the side surface of the push rod positioned at the rear end in the rotating direction of the cylinder body, the gas blowing holes are aligned with the sieve hole rows in a one-to-one correspondence manner, the wind blown from the gas blowing holes blows Chinese herbal pieces blocked in the sieve holes into the Therefore, when the push rod reaches the edge of the sieve hole, the part of the Chinese herbal pieces extending out of the sieve hole and toppling over towards the front of the rotation direction of the barrel body is converted into the part extending out of the sieve hole, the part extending out of the sieve hole and toppling over towards the front of the rotation direction of the barrel body is just opposite to the sieve hole, the air blown out from the air blowing hole can more reliably push the Chinese herbal pieces extending out of the sieve hole and toppling over towards the front of the rotation direction of the. When the sieve is used, the traditional Chinese medicine decoction pieces are poured into the barrel from the high end of the barrel, the barrel rotates under the driving of the driving rotating shaft, the traditional Chinese medicine decoction pieces move towards the low end of the barrel while rotating along with the barrel in the barrel, the traditional Chinese medicine decoction pieces are sieved in the process, the thick traditional Chinese medicine decoction pieces fall out from the low end of the barrel, and the thin traditional Chinese medicine decoction pieces fall out from the sieve pores. If the push rod is not arranged, the traditional Chinese medicine decoction pieces which extend out of the sieve holes and are toppled towards the front of the rotation direction of the cylinder body are easy to generate the phenomenon that the traditional Chinese medicine decoction pieces cannot be blown back into the cylinder body, namely, the reliability is poor when the sieve holes are dredged. The hole of blowing among this technical scheme can align the sieve mesh one-to-one and blow, and the reliability when the mediation is better.
Preferably, a connecting strip is arranged at one end, away from the push rod, of the end plate, a blowing hole communicated with the air distribution cavity is formed in the connecting strip, the blowing hole is formed in the surface, facing one side of the push rod, of the connecting strip, and when the barrel rotates to the position, along the plane where the side face of the front end of the rotating direction of the barrel is located, of the push rod, of the sieve hole, when the edge of the front end of the rotating direction of the barrel is located, the part, exposed outside the barrel, of the traditional Chinese medicine decoction piece, blocked in the sieve hole, of the side face of the rear end of the rotating direction of the barrel, of the push rod is. When the push rod reaches the edge of the sieve mesh, the part of the Chinese herbal pieces extending out of the sieve mesh and toppling over towards the rear of the rotation direction of the barrel body is opposite to the sieve mesh by the air blown out of the air blowing hole, so that the function of dredging reliability is improved.
Preferably, the opening direction line of the blowing hole and the opening direction line of the blowing hole are located on the same plane in a one-to-one correspondence manner. The reliability that the part of the traditional Chinese medicine decoction pieces which extend out of the sieve pores and topple over towards the rear of the rotation direction of the barrel body by the air blown out from the air blowing holes is over against the sieve pores can be improved.
Preferably, when the cylinder is rotated until the edge of the sieve hole at the front end in the rotation direction of the cylinder is located on the plane of the side surface of the push rod at the rear end in the rotation direction of the cylinder, the distance between the outer end of the sieve hole blocked on the plane of the side surface of the push rod at the rear end in the rotation direction of the cylinder and the neutral line of the cylinder at the farthest position from the outer end of the sieve hole and the line of the opening direction of the air blowing hole located on the same plane as the air outlet hole aligned with the sieve hole blocked on the plane of the side surface of the push rod at the rear end in the rotation direction of the cylinder are greater than zero. The reliability that the part of the traditional Chinese medicine decoction pieces which extend out of the sieve pores and topple over towards the rear of the rotation direction of the barrel body by the air blown out from the air blowing holes is over against the sieve pores can be improved.
Preferably, the end of the connecting strip, which is far away from the air distribution cavity, is provided with bristles for brushing the surface of the cylinder, the push rod, the air distribution cavity and the connecting strip enclose a U-shaped pressurizing groove, and the air blowing hole is positioned in the pressurizing groove. The pressure boosting effect can be achieved, the reliability that the part of the traditional Chinese medicine decoction pieces, which extends out of the sieve pores and is inclined towards the rear of the rotation direction of the barrel body, is just aligned to the sieve pores by the wind blown out of the blowing holes can be improved, and the reliability that the traditional Chinese medicine decoction pieces in the sieve pores are blown into the barrel body by the wind blown out of the blowing holes can be improved.
Preferably, a cutting edge extending in the extending direction of the push rod is formed between the end surface of the push rod facing one end of the cylinder and the side surface of the push rod located at the rear end of the cylinder in the rotating direction. When the traditional Chinese medicine decoction pieces cannot be blown back into the barrel, the part of the traditional Chinese medicine decoction pieces extending out of the sieve holes is cut off, so that the sieve holes can be reliably dredged when the sieve holes are blown twice.
Preferably, one side surface of the cutting edge is in contact and abutment with the cylinder surface. The rotation of barrel can play the effect of whetting a knife for the blade keeps sharp for a long time.
Preferably, the push rod is provided with a guide rod, the rack is provided with a guide ring sleeved on the guide rod, and the rack is further provided with a pressing spring for driving the push rod to move towards the cylinder body so that one side surface of the cutting edge is in contact and abutted with the surface of the cylinder body. The reliability of whetting a knife can be improved.
Preferably, the end face, facing one end of the barrel, of the push rod is provided with a plurality of mounting holes aligned with the sieve mesh rows in a one-to-one correspondence mode, pressing balls and pressing ball ejection springs for driving the pressing balls to extend out of the mounting holes are arranged in the mounting holes, and the diameters of the pressing balls are larger than those of the sieve meshes. Can press the herbal pieces which are not blown into the barrel in the sieve pores, so that the herbal pieces fall into the barrel. Further improving the reliability of dredging the sieve pores.
Preferably, the high end of the cylinder is provided with an inner retainer ring extending along the axial direction of the cylinder, and the rack is provided with a feeding hopper with an outlet end extending into the high end of the cylinder. Can prevent the Chinese herbal pieces from falling out from the high end of the barrel when the Chinese herbal pieces are poured into the barrel.
Preferably, the rack is provided with a coarse medicine feeding hopper for receiving the traditional Chinese medicine with coarse medicine falling from the lower end of the barrel and a fine medicine feeding hopper for receiving the traditional Chinese medicine with coarse medicine falling through the sieve pores of the barrel.
The invention has the following beneficial effects: the sieve mesh can be dredged in the process of sieving the Chinese herbal pieces, so that the phenomenon of blockage caused by penetration can be avoided.
Drawings
Fig. 1 is a schematic front view of a traditional Chinese medicine sieving machine according to a first embodiment of the present invention;
FIG. 2 is a schematic sectional view A-A of FIG. 1;
FIG. 3 is an enlarged partial schematic view of FIG. 2;
fig. 4 is a schematic view of a traditional Chinese medicine sieving machine in the second embodiment of the present invention.
In the figure: a frame 1, a cylinder 2, a driving rotating shaft 3, a connecting rib 4, a sieve pore 5, an inner retainer ring 6, a feeding hopper 7, a coarse medicine discharging hopper 8, a fine medicine discharging hopper 9, a cylinder rotating motor 10, a push rod 11, a connecting rod 12, an end plate 13, an air distribution cavity 14, a side surface 15 of the push rod at the rear end in the rotating direction of the cylinder, an air blowing hole 16, an edge 17 of the front end of the sieve pore in the rotating direction of the cylinder, a connecting strip 18, an air blowing hole 19, a distance L of the farthest distance from the outer end of the sieve pore on the plane of the side surface of the push rod at the rear end in the rotating direction of the cylinder to the opening direction line of the air blowing hole aligned with the sieve pore on the plane of the side surface of the push rod at the rear end in the rotating direction of the cylinder, bristles 20, a pressurizing groove 21, a cutting edge 22, a mounting hole 23, a pressing ball 24, a pressing spring 25, A guide rod 26, a guide ring 27, a pressing spring 28, and an air inlet hole 29.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
In the first embodiment, a method for continuously blowing air to dredge a cylinder of a traditional Chinese medicine sieving machine is realized by the traditional Chinese medicine sieving machine shown in fig. 1 to 3, and the traditional Chinese medicine sieving machine comprises a frame 1, a cylinder 2 and a push rod 11. The frame is rotatably connected with a driving rotating shaft 3 which is obliquely arranged. The cylinder 2 is circular, and the two ends of the cylinder are open. The cylinder body is coaxially sleeved on the driving rotating shaft and is connected to the driving rotating shaft through a plurality of connecting ribs 4. The circumferential surface of the barrel is provided with a plurality of rows of sieve mesh rows distributed along the axial direction of the barrel, and each row of sieve mesh rows is provided with a plurality of sieve meshes 5 distributed along the circumferential direction of the barrel. The outer peripheral surface of the cylinder body is a smooth surface and is provided with a chromium coating. The sieve pores are round holes. Radial extension of the mesh bowl. The high end of the cylinder body is provided with an inner retainer ring 6 which extends along the axial direction of the cylinder body. The frame is provided with a feeding hopper 7 with an outlet end extending into the high end of the cylinder. The frame is provided with a coarse medicine feeding hopper 8 for receiving the coarse traditional Chinese medicine at the lower end of the barrel body and a fine medicine feeding hopper 9 for receiving the coarse traditional Chinese medicine through the sieve pores of the barrel body. The present invention further includes a drum rotating motor 10 for driving the rotation of the driving shaft. One end of the rotating shaft of the cylinder rotating motor is coaxially connected with the high end of the driving rotating shaft. The push rod 11 extends from one end of the cylinder to the other. The two ends of the push rod are fixed with the frame through a connecting rod 12 respectively. The push rod is used for pushing the part of the Chinese herbal pieces, which extends out of the sieve pores and is toppled towards the front of the rotation direction of the cylinder body (the rotation direction of the cylinder body is the clockwise direction in figure 2), towards the back of the rotation direction of the cylinder body. The end of the push rod remote from the barrel is provided with an end plate 13 located on the rear end of the push rod in the direction of rotation of the barrel. An air distribution cavity 14 is arranged in the end plate. The side 15 of the push rod located at the rear end in the rotational direction of the cylinder is a flat surface. The air distribution chamber is provided with an air inlet 29. The air distribution chamber is provided with a plurality of air blowing holes 16 distributed along the extension direction of the push rod. The blow holes are located on the surface of the end plate facing the cylinder side. The opening direction of the air blowing hole is parallel to the side surface of the push rod at the rear end of the cylinder in the rotating direction. When the barrel rotates to the position that the edge 17 of the front end of the sieve hole along the rotating direction of the barrel is positioned on the plane of the side surface of the rear end of the push rod in the rotating direction of the barrel, the sieve holes with the edges positioned on the plane of the side surface of the rear end of the push rod in the rotating direction of the barrel are aligned with the air blowing holes in a one-to-one correspondence mode. The air blowing holes are aligned with the sieve pore rows in a one-to-one correspondence manner. The end of the end plate remote from the push rod is provided with a connecting strip 18. The connecting strip is provided with a blowing hole 19 communicated with the air distribution cavity. The air blowing hole is arranged on the surface of one side of the connecting strip facing the push rod. When the barrel rotates to the position that the edge of the front end of the sieve pore along the rotation direction of the barrel is positioned on the plane of the side surface of the push rod positioned at the rear end of the rotation direction of the barrel, the part of the Chinese herbal pieces, which is exposed outside the barrel, in the sieve pore of which the edge is positioned on the plane of the side surface of the push rod positioned at the rear end of the rotation direction of the barrel can be blown by the wind blowing hole. The opening direction line of the blowing hole and the opening direction line of the blowing hole are correspondingly positioned on the same plane one by one. When the barrel rotates to the position that the edge of the front end of the sieve pore along the rotation direction of the barrel is positioned on the plane of the side surface of the push rod positioned at the rear end of the rotation direction of the barrel, the distance between the outer end of the sieve pore blocked on the plane of the side surface of the push rod positioned at the rear end of the rotation direction of the barrel and the neutral line of the barrel is the farthest distance from the outer end of the sieve pore and the opening direction line of the air blowing hole positioned on the same plane as the aligned air outlet hole of the sieve pore blocked on the plane of the side surface of the push rod positioned at the rear end of the rotation direction of the barrel. The end of the connecting strip far away from the air distribution cavity is provided with brush bristles 20 for brushing the surface of the cylinder body. The push rod, the air distribution cavity and the connecting strip are enclosed into a U-shaped pressurizing groove 21. The air blowing hole is positioned in the pressurizing groove. A cutting edge 22 extending in the extension direction of the push rod is formed between the end surface of the push rod facing one end of the cylinder and the side surface of the push rod located at the rear end in the rotation direction of the cylinder. One side surface of the cutting edge is contacted and abutted with the cylinder surface. The end face of the push rod facing one end of the barrel is provided with a plurality of mounting holes 23 which are aligned with the sieve mesh rows in a one-to-one correspondence mode, and a pressing ball 24 and a pressing ball ejection spring 25 for driving the pressing ball to extend out of the mounting holes are arranged in the mounting holes. The diameter of the pressing ball is larger than that of the sieve pore.
When the feeding device is used, the traditional Chinese medicine decoction pieces are poured into the barrel from the high end of the barrel through the feeding hopper, the barrel continuously rotates under the driving of the barrel driving motor, the traditional Chinese medicine decoction pieces move towards the low end of the barrel while rotating along with the barrel in the barrel, the traditional Chinese medicine decoction pieces are screened in the process, the thick traditional Chinese medicine decoction pieces fall out from the low end of the barrel to the thick medicine feeding hopper to flow out, and the thin traditional Chinese medicine decoction pieces fall out from the screen holes to the thin medicine feeding hopper to flow out. The continuous pivoted process sieve mesh of barrel is dredged, and the process that the sieve mesh specifically was dredged is: the traditional Chinese medicine decoction pieces which extend out of the sieve pores and are blocked in the sieve pores (hereinafter referred to as protruding traditional Chinese medicine decoction pieces which extend out of the sieve pores and are blocked in the sieve pores) firstly pass through the bristles and are flexibly pushed by the bristles, then the protruding traditional Chinese medicine decoction pieces reach the pressurizing groove, the part, extending out of the sieve pores, of the protruding traditional Chinese medicine decoction pieces, which are inclined towards the rear of the rotation direction of the cylinder body, move towards the front of the rotation direction of the cylinder body under the action of air blown by the air blowing holes, then the protruding traditional Chinese medicine decoction pieces are contacted with the push rod, the part, extending out of the sieve pores, of the protruding traditional Chinese medicine decoction pieces, which are inclined towards the front of the rotation direction of the cylinder body, move towards the rear of the rotation direction of the cylinder body, the part, extending out of the sieve pores, and the traditional Chinese medicine decoction pieces; if the Chinese herbal pieces blocked in the sieve holes are not pushed out of the barrel body, the part of the Chinese herbal pieces blocked in the sieve holes, which protrudes out of the barrel body, is cut off under the action of the cutting edge, and then the Chinese herbal pieces blocked in the sieve holes are driven towards the inside of the barrel body for the second time to fall into the barrel body under the action of the pressing ball ejecting spring matched with the pressing ball.
In the second embodiment, the different supports from the first embodiment are:
referring to fig. 4, two ends of the push rod are provided with two guide rods 26, and the frame is provided with 2 guide rings 27 which are sleeved on the two guide rods in a one-to-one correspondence manner. The frame is also provided with a pressing spring 28 which drives the push rod to move towards the cylinder body so that one side surface of the cutting edge is in contact and abutted with the surface of the cylinder body. The pressing spring is a tension spring.
Claims (1)
1. A continuous rotation and continuous blowing type dredging method for a barrel of a traditional Chinese medicine screening machine is characterized in that the traditional Chinese medicine screening machine comprises a rack, a barrel and a push rod, a driving rotating shaft which is obliquely arranged is rotatably connected to the rack, the barrel is coaxially sleeved on the driving rotating shaft and is fixed together with the driving rotating shaft, the barrel is circular, a plurality of rows of sieve mesh rows which are distributed along the axial direction of the barrel are arranged on the circumferential surface of the barrel, a plurality of sieve meshes which are distributed along the circumferential direction of the barrel are arranged on each row of sieve mesh rows, the outer circumferential surface of the barrel is a smooth surface, the push rod extends from one end of the barrel to the other end, the push rod is used for pushing the part of traditional Chinese medicine decoction pieces which extend out of the sieve meshes and are toppled towards the front of the rotation direction of the barrel towards the rear direction of the barrel, an, the end plate is internally provided with an air distribution cavity, the side surface of the push rod, which is positioned at the rear end of the cylinder in the rotating direction, is a plane, the air distribution cavity is provided with a plurality of air blowing holes distributed along the extending direction of the push rod, the air blowing holes are positioned on the surface of the end plate, which faces the cylinder, the opening direction of the air blowing holes is parallel to the side surface of the push rod, which is positioned at the rear end of the cylinder in the rotating direction, when the cylinder rotates to the position that the edge of the sieve mesh, which is positioned at the front end of the cylinder in the rotating direction, is positioned on the plane where the side surface of the push rod is positioned at the rear end of the cylinder in the rotating direction, the sieve mesh, which is positioned on the plane where; the wind that the continuous pivoted in-process blowhole of barrel blew off blows the herbal pieces-ready prepared for use who blocks up in the sieve mesh and blows the effect that plays mediation sieve mesh in the barrel, the push rod will stretch out the part of sieve mesh towards the part of stretching out of the herbal pieces-ready prepared for use who topples over in barrel direction of rotation the place ahead of sieve mesh and push away towards the rear of barrel direction of rotation, thereby it is just right with the sieve mesh to stretch out the herbal pieces-ready prepared for use who stretches out sieve mesh part and topple over towards barrel direction of rotation the place ahead when making the push rod reach the sieve mesh edge, make the wind that the blowhole blew off can with blocking up in the sieve mesh more reliably in the.
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| CN202010822747.0A CN111889369B (en) | 2020-08-17 | 2020-08-17 | Continuous-rotation continuous-blowing dredging method for cylinder of traditional Chinese medicine sieving machine |
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| CN202010822747.0A CN111889369B (en) | 2020-08-17 | 2020-08-17 | Continuous-rotation continuous-blowing dredging method for cylinder of traditional Chinese medicine sieving machine |
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| CN115445932A (en) * | 2022-11-14 | 2022-12-09 | 中节能(达州)新材料有限公司 | Glass bead isolated dynamic screening device and screening method |
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