Rotary vacuum screening equipment

Abstract

The invention provides rotary type vacuum screening equipment, and relates to the technical field of screening equipment, the rotary type vacuum screening equipment comprises a base, a vibration assembly, a screening mechanism and a top cover, the screening mechanism comprises a screening frame, a screening plate assembly and a bottom shell, the screening plate assembly comprises two screening rings, and screening plates are connected to the screening rings at intervals; the screening plates on the two screening rings are distributed in a staggered mode to form a circular filtering sieve, half-strip-shaped holes are formed in the side walls of the screening plates, a screening motor is fixed to the middle of the bottom shell, the output end of the screening motor is connected with a driving rod, and two sets of spiral sliding grooves are symmetrically formed in the outer wall of the middle of the driving rod. The upper ends and the lower ends of the two sets of spiral sliding grooves communicate with each other, the outer side of the driving rod is symmetrically connected with two driving half cylinders in a sliding mode, sliding rods are arranged on the inner sides of the driving half cylinders, the sliding rods are arranged in the spiral sliding grooves in a sliding and penetrating mode, and the screening rings are fixed to the driving half cylinders correspondingly. The screening plate slides in a staggered mode, so that the screening effect of chippings is better.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, in particular to rotary vacuum screening equipment. Background Art

[0002] With the expansion of high-performance material technology, more and more high-temperature resistant special resins are being used in aerospace, electronics, protection, and energy fields. The particles used for melt spinning generally need to be dried. In order to improve the uniformity and effectiveness of drying during the process, they need to be turned or stirred. This process will produce a large amount of dust and fine particles (triangle materials), and these tiny particles will seriously affect the spinning quality and the smooth progress of spinning, so they need to be cleaned.

[0003] Especially for liquid crystal spinning resin, its particles are very brittle and irregular, and it is easy to fall off during the stirring and friction process. It is very different from the round, smooth and plastic particles of polyester, polypropylene and other fibers. Its debris is irregular particles, mostly in the form of polyhedrons, strips and flat shapes. Using a circular hole net, vibration or blowing to clean it cannot achieve the ideal effect. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides a rotary vacuum screening device that solves the problems raised in the above background technology.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A rotary vacuum screening device comprises a base, a vibration component, a screening mechanism and a top cover, the vibration component is installed on the top of the base, the screening mechanism comprises a screen frame, a screen plate assembly and a bottom shell, the bottom shell is connected above the vibration component, the screen frame is fixed on the top of the bottom shell, the screen plate assembly is slidingly connected to the screen frame, the screen plate assembly comprises two screening rings slidingly connected to each other, the outer edge of the screening ring is provided with a plurality of spaced connecting teeth, a sliding gap is provided between two adjacent connecting teeth, the connecting teeth on the screening ring are slidably passed through the sliding gap of the other screening ring, and a plurality of connecting teeth are connected with screening plates, the screening plates on the two screening rings are staggered to form a circular filter screen, half-strip holes are opened on the left and right side walls of the screening plate, and the half-strip holes on the two adjacent screening plates are connected to form a strip hole.

[0009] Preferably, a screening motor is fixed in the middle of the bottom shell, and the output end of the screening motor is connected to a driving rod. Two groups of spiral chutes are symmetrically arranged on the middle outer wall of the driving rod, and the upper and lower ends of the two groups of spiral chutes are connected. The outer side of the driving rod is symmetrically slidingly connected to two driving half-cylinders, and a sliding rod is provided on the inner side of the driving half-cylinder. The sliding rods on the two driving half-cylinders are symmetrically arranged on the upper and lower sides of the driving half-cylinder, and the end of the sliding rod is rotatably connected to a swing block, and the swing block slides through the spiral chute, and the two screening rings are respectively fixed on the outer wall of the driving half-cylinder.

[0010] Preferably, a sliding groove is provided on the side of the screen plate facing the screen frame, and a sliding ridge is provided on the inner wall of the screen frame, and the sliding ridge slides through the sliding groove.

[0011] Preferably, the height difference between the upper and lower ends of the spiral chute is less than the sum of the thicknesses of the two screening plates, and the number of spiral turns of the spiral chute is 0.5×(2n+1).

[0012] Preferably, the outer wall of the driving half-cylinder is provided with a fan-shaped groove, and a height-adjusting screw is rotatably connected to the top wall of the fan-shaped groove. A guide rod is fixed in the fan-shaped groove, and a height-adjusting spring is sleeved on the guide rod. The inner wall of the screening ring is provided with a fan-shaped plate that matches the concave and convex shape of the fan-shaped groove, and a height-adjusting screw hole is provided in the middle of the fan-shaped plate. The height-adjusting screw is threadedly connected and passes through the height-adjusting screw hole. A guide hole is provided on the fan-shaped plate, and the guide rod passes through the guide hole. The two ends of the height-adjusting spring are respectively fixed on the fan-shaped plate and the driving half-cylinder.

[0013] Preferably, the top of the driving rod is set as a threaded rod, the threaded rod is threadedly connected with a threaded sleeve, the top of the threaded sleeve is fixed with a connecting top plate, the connecting top plate protrudes outward with a sealing ring, the sealing ring is downwardly provided with a number of sealing guide rods, the outer wall of the sealing guide rod is sleeved with a sealing spring, the outer edge of the sealing ring is slidingly connected with a sealing sleeve, the middle part of the inner wall of the sealing sleeve is provided with a connecting ring, the sealing guide rod slides through the connecting ring, the upper and lower ends of the sealing spring are respectively fixed between the sealing ring and the connecting ring, the lower end of the sealing sleeve is in contact with the screening ring, the upper end of the connecting top plate is connected with a guide cone cover, and the guide cone cover is provided on the outside of the sealing sleeve.

[0014] Preferably, a motor sleeve is fixed in the middle of the bottom shell, the screening motor is placed inside the motor sleeve, an inner concave ring is provided on the top of the motor sleeve, the output end of the screening motor passes through the middle of the inner concave ring, and the top of the inner concave ring abuts against the lower side of the driving rod.

[0015] Preferably, the upper side of the inner wall of the half-strip hole is set as a vertical surface, and the lower side of the inner wall of the half-strip hole is set as an inscribed inclined surface.

[0016] Preferably, the vibration assembly includes a vibration sleeve, a vibration motor and a vibration spring. The vibration sleeve is fixed to the middle part of the lower side of the bottom shell, the vibration motor is installed inside the vibration sleeve, an eccentric block is installed at the output end of the vibration motor, and a plurality of vibration guide rods are distributed circumferentially at the lower end of the bottom shell. The vibration guide rods are slidably passed through the top of the base, and the vibration spring is sleeved on the vibration guide rods. The upper and lower ends of the vibration spring respectively abut against the bottom shell and the base.

[0017] (3) Beneficial effects

[0018] The present invention provides a rotary vacuum screening device having the following beneficial effects:

[0019] 1. In the present invention, the screening mechanism vibrates on the base under the action of the vibration motor, and the liquid crystal spinning resin particles are centrifugally vibrated on the screen plate assembly through the eccentric block. The debris is irregular particles and is filtered through the strip holes formed by the half-strip holes, leaving complete resin particles.

[0020] 2. In the present invention, the screening motor rotates, and the threaded groove on the driving rod can make the two driving half-cylinders slide upward and downward synchronously, so that the two groups of screening plates on the two screening rings can move up and down in a staggered manner. During the staggered process, irregular debris with a different direction from the strip holes can be sheared, and the debris can be further crushed, making the debris easier to filter.

[0021] 3. In the present invention, under the action of the sealing spring, the sealing sleeve always contacts the upper side of the screening ring during the up and down sliding of the screening ring, forming a seal to prevent debris from entering the screening ring and jamming the driving half cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a rotary vacuum screening device of the present invention;

[0023] Figure 2 An exploded view of a rotary vacuum screening device according to the present invention;

[0024] Figure 3 Schematic diagram of the structure of the screening mechanism of the present invention;

[0025] Figure 4 Schematic diagram of the structure of the driving device in the present invention;

[0026] Figure 5 Schematic diagram of the structure of the screening plate in the present invention;

[0027] Figure 6 Schematic diagram of the structure of the screening ring in the present invention;

[0028] Figure 7 It is a structural schematic diagram of the threaded sleeve in the present invention.

[0029] In the figure: 1. base; 2. top cover; 3. screen frame; 4. bottom shell; 5. first discharge port; 6. second discharge port; 7. vibrating sleeve; 8. vibrating motor; 9. vibrating spring; 10. vibrating guide rod; 11. docking half ring; 12. feed barrel; 13. screening ring; 14. connecting tooth; 15. screening plate; 16. half-strip hole; 17. motor sleeve; 18. screening motor; 19. driving rod; 20. spiral chute; 21. driving half barrel; 22. sliding rod; 23. swing block; 24. fan-shaped edge; 25. height adjustment screw; 26. guide rod; 27. height adjustment spring; 28. fan-shaped plate; 29. ​​threaded sleeve; 30. sealing ring; 31. sealing guide rod; 32. sealing spring; 33. sealing sleeve; 34. connecting ring; 35. guide cone cover. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] like Figure 1 、 Figure 2 As shown, a rotary vacuum screening device includes a base 1, a vibration component, a screening mechanism and a top cover 2, the screening mechanism includes a screen frame 3, a screen plate assembly and a bottom shell 4, the side wall of the screen frame 3 is connected with a first discharge port 5, the side wall of the bottom shell 4 is connected with a second discharge port 6, the vibration component includes a vibration sleeve 7, a vibration motor 8 and a vibration spring 9, the vibration sleeve 7 is fixed to the middle of the lower side of the bottom shell 4, the vibration motor 8 is installed inside the vibration sleeve 7, the output end of the vibration motor 8 is installed with an eccentric block, the lower end of the bottom shell 4 is circumferentially distributed with a number of vibration guide rods 10, the vibration guide rods 10 are slidably penetrated on the top of the base 1, and the lower end of the vibration guide rods 10 is provided with a plurality of vibration guide rods 10. A limiting nut is fixed at the end, and the limiting nut is in contact with the lower side of the base 1. The vibration spring 9 is sleeved on the vibration guide rod 10. The upper and lower ends of the vibration spring 9 are respectively in contact with the bottom shell 4 and the base 1. The screen frame 3 is installed on the upper side of the bottom shell 4. Two docking semi-rings 11 are sleeved on the outer wall of the top of the screen frame 3 and the bottom shell 4. Both ends of the two docking semi-rings 11 are connected with docking blocks. The docking blocks on the two docking semi-rings 11 are in contact with each other and are buckled on the top of the screen frame 3. A docking semi-ring 11 is also connected between the top cover 2 and the screen frame 3. A feeding barrel 12 is provided in the middle of the top cover 2, and a feeding flange for connecting a feeding device is provided on the top of the feed barrel 12.

[0032] like Figure 2 、 Figure 3 、 Figure 5 、 Figure 6As shown, the screening mechanism includes a screen frame 3, a screen plate assembly and a bottom shell 4, the bottom shell 4 is connected above the vibration assembly, the screen frame 3 is fixed on the top of the bottom shell 4, the screen plate assembly includes two screen rings 13 that are slidably connected to each other, the outer edge of the screen ring 13 is provided with a plurality of spaced connecting teeth 14, the connecting teeth 14 extend toward the direction of the other screen ring 13, a sliding gap is provided between two adjacent connecting teeth 14, the connecting teeth 14 on the screen ring 13 are slidably penetrated in the sliding gap of the other screen ring 13, the connecting teeth 14 are concave-convex matched with the sliding gap, and a plurality of the connecting teeth 14 are connected to the screen The screening plate 15 is provided with a plurality of fixed sieve holes in the middle part, and the screening plates 15 on the two screening rings 13 are staggered to form a circular filter screen, and half-strip holes 16 are provided on the left and right side walls of the screening plate 15, and the upper side of the inner wall of the half-strip hole 16 is set as a vertical surface, and the lower side of the inner wall of the half-strip hole 16 is set as an inscribed inclined surface. The half-strip holes 16 on the two adjacent screening plates 15 are connected to form a strip hole, and the size of the strip hole is designed to be reduced according to the average size of the resin particles. The screening plate 15 is provided with a sliding groove on the side facing the screen frame 3, and a sliding ridge is provided on the inner wall of the screen frame 3, and the sliding ridge slides through the sliding groove.

[0033] In the above technical solution, the two screening rings 13 slide against each other under the guidance of the connecting teeth 14, so that several screening plates 15 fixed on the connecting teeth 14 can slide against each other in an interlaced manner. During the interlaced sliding process, the half-strip holes 16 on the two adjacent screening plates 15 slide up and down in an offset manner to form strip holes that shear each other. The vertical surface of the half-strip hole 16 is higher than the upper side surface of the other screening plate 15 during the offset sliding. The polyhedron, strip, and flat debris that is inconsistent with the direction of the strip hole can be extended to the part directly above the strip hole and pressed down, so that the debris is tilted and screened or sheared and crushed along the strip hole to make the debris smaller and easier to screen. Controlling the sliding size of the two screening rings 13 can avoid damage to the resin particles during the shear screening process.

[0034] like Figure 3 、 Figure 4As shown, a motor sleeve 17 is fixed in the middle of the bottom shell 4, and a screening motor 18 is fixed inside the motor sleeve 17. The output end of the screening motor 18 is connected to a driving rod 19. The top of the motor sleeve 17 is provided with an inner concave ring. The output end of the screening motor 18 passes through the middle of the inner concave ring, and the top of the inner concave ring abuts against the lower side of the driving rod 19. The screening motor 18 can be isolated by the motor sleeve 17 to prevent the debris screened from the upper screening plate 15 from falling to the position of the screening motor 18, so that the debris falling on the bottom shell 4 after screening is conveniently transported from the second discharge port 6 through centrifugal vibration. Discharge, two groups of spiral chutes 20 are symmetrically arranged on the outer wall of the middle part of the driving rod 19, and the upper and lower ends of the two groups of spiral chutes 20 are connected. The height difference between the upper and lower ends of the spiral chutes 20 is less than the sum of the thicknesses of the two screening plates 15. The limitation of the height difference can avoid the two groups of screening plates 15 from moving too far, causing the resin particles to fall. The number of spiral turns of the spiral chutes 20 is 0.5×(2n+1) turns. By limiting the number of turns of the spiral chutes 20, the docking positions of the two groups of spiral chutes 20 can be located on the left and right sides of the driving rod 19, that is, the driving half cylinder 21 on the left is located at the two groups of spiral chutes. When the groove 20 is at the left docking position, the driving half-cylinder 21 on the right is located at the right docking position of the two groups of spiral chutes 20. The outer side of the driving rod 19 is symmetrically connected to the two driving half-cylinders 21. The ends of the two driving half-cylinders 21 are provided with guide blocks and guide grooves that slide with each other. The inner side of the driving half-cylinder 21 is provided with a sliding rod 22. The sliding rods 22 on the two driving half-cylinders 21 are symmetrically arranged on the upper and lower sides of the driving half-cylinder 21. The end of the sliding rod 22 is rotatably connected to a swing block 23. The swing block 23 slides through the spiral chute 20. The two screening rings 13 are respectively Fixed on the outer wall of the driving half-cylinder 21, during the rotation of the screening motor 18, the upper and lower spiral chutes 20 on the driving rod 19 rotate together, so that the sliding rod 22 symmetrically arranged in the spiral chute 20 can slide symmetrically. Under the limiting action of the sliding groove at the end of the screening plate 15 and the sliding ridges on the inner wall of the screen frame 3, the driving half-cylinder 21 can only slide up and down, that is, the two driving half-cylinders 21 slide up and down synchronously in the spiral chute 20. Under the guiding action of the swing block 23, the connecting position of the two groups of spiral chutes 20 is turned, and the unidirectional rotation of the screening motor 18 can realize the reciprocating motion of the two driving half-cylinders 21 in opposite directions.

[0035] like Figure 4 、 Figure 5As shown, the outer wall of the driving half cylinder 21 is provided with a fan-shaped groove, the top of the fan-shaped groove is provided with a fan-shaped edge 24, the fan-shaped edge 24 is rotatably connected to the height adjustment screw 25, a guide rod 26 is fixed in the fan-shaped groove, and a height adjustment spring 27 is sleeved on the guide rod 26. The inner wall of the screening ring 13 is provided with a fan-shaped plate 28 that matches the concave and convex of the fan-shaped groove, and a height adjustment screw hole is provided in the middle of the fan plate 28. The height adjustment screw 25 is threadedly connected and passes through the height adjustment screw hole. There is a guide hole, and the guide rod 26 passes through the guide hole. A positioning ring is provided at the lower end of the guide rod 26. The two ends of the height adjustment spring 27 are respectively fixed on the fan plate 28 and the driving half cylinder 21. By rotating the height adjustment screw hole, the initial height of the screening ring 13 (i.e., the screening plate 15) relative to the driving half cylinder 21 can be adjusted. It can be used to level the height of the two screening rings 13 when the two driving half cylinders 21 are in a flush position, so that the screening plates 15 on the two screening rings 13 remain in a flush position.

[0036] like Figure 3 、 Figure 7 As shown, the top of the driving rod 19 is set as a threaded rod, and a threaded sleeve 29 is threadedly connected to the threaded rod. A connecting top plate is fixed to the top of the threaded sleeve 29, and a sealing ring 30 protrudes outward from the connecting top plate. A plurality of sealing guide rods 31 are provided downwardly on the sealing ring 30. The outer wall of the sealing guide rod 31 is provided with a sealing spring 32. The outer edge of the sealing ring 30 is slidably connected to a sealing sleeve 33. A connecting ring 34 is provided in the middle of the inner wall of the sealing sleeve 33. The sealing guide rod 31 slides through the connecting ring 34. The upper and lower ends of the sealing spring 32 are respectively fixed to the sealing ring 30 and the connecting ring 3 4, the lower end of the sealing sleeve 33 is in contact with the screening ring 13, and the upper end of the connecting top plate is connected to a guide cone cover 35, and the guide cone cover 35 is arranged on the outside of the sealing sleeve 33. When the resin particles enter the screen frame 3 from the feed barrel 12, the guide cone cover 35 can prevent the vertical particles from entering the bottom of the screening ring 13, so that the vertical particles fall on the screening plate 15. At the same time, when the screening ring 13 slides up and down, the sealing sleeve 33 is always in contact with the upper side of the screening ring 13 under the support of the sealing spring 32, and can always block the resin particles and debris from passing through the screening ring 13 into the interior of the driving half cylinder 21 to cause jamming.

[0037] Workflow:

[0038] In the present invention, the resin particles enter the screen frame 3 from the middle of the top cover 2 through the feed tube 12, and all fall into the upper side of the filter screen composed of several screening plates 15 under the guidance of the guide cone cover 35. The screening mechanism vibrates under the drive of the vibration motor 8, and the debris is filtered and screened from the fixed screen holes and the strip holes, so that the resin particles generate centrifugal vibration and are discharged through the first discharge port 5; the screened debris is discharged from the second discharge port 6 under the action of vibration.

[0039] During the vibration process, since the formation of resin particles on the screening plate 15 is limited and the fixed holes and the strip holes are arranged in a fixed direction, some debris will not always be able to maintain the same direction as the strip holes and cannot be screened smoothly and completely. Some debris will be discharged from the first discharge port 5 together with the resin particles, thereby affecting the spinning quality.

[0040] In order to completely screen the debris in the resin particles, the screening motor 18 is rotated to make the driving rod 19 rotate and slide through the spiral chute 20 to make the driving half cylinder 21 slide synchronously in the opposite direction, and slide to the end connection of the two sets of spiral chute 20. The swing block 23 turns under the guidance of the side wall of the connection and enters the other spiral chute 20 to achieve reversal. During the process, the two driving half cylinders 21 always keep opposite synchronization, and the screening ring 13 is fixed on the driving half cylinder 21, so that the screening plate 15 fixed on the connecting tooth 14 of the screening ring 13 slides up and down. The half-strip holes 16 on the two adjacent screen plates 15 are reciprocally offset. The screen plate 15 on one side moves upward, and the vertical surface of the half-strip hole 16 is higher than the upper side surface of the other screen plate 15, forming a height difference. The inscribed inclined surface shrinks inward to form a shear cut. During the vibration process, the debris that is inconsistent with the direction of the strip hole, part of the debris is guided by the height difference between the two screen plates 15 and gradually becomes consistent with the strip hole. The other part is pressed down by the shear cut to slide vertically into the strip hole, or the debris is sheared and crushed, reducing the particle size of the debris and making it easier to screen.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A rotary vacuum screening device, comprising a base, a vibration assembly, a screening mechanism and a top cover, characterized in that: The vibration component is installed on the top of the base, and the screening mechanism includes a screen frame, a screen plate assembly and a bottom shell. The bottom shell is connected above the vibration component, and the screen frame is fixed on the top of the bottom shell. The screen plate assembly is slidably connected to the screen frame. The screen plate assembly includes two screening rings that are slidably connected to each other, and the outer edge of the screening ring is provided with a plurality of spaced connecting teeth, and a sliding gap is provided between two adjacent connecting teeth. The connecting teeth on the screening ring are slidably penetrated in the sliding gap of another screening ring, and a plurality of connecting teeth are connected with screening plates. The screening plates on the two screening rings are staggered to form a circular filter screen, and half-strip holes are opened on the left and right side walls of the screening plate, and the half-strip holes on two adjacent screening plates are connected to form a strip hole.

2. A rotary vacuum screening device according to claim 1, characterized in that: A screening motor is fixed to the middle part of the bottom shell, and a driving rod is connected to the output end of the screening motor. Two groups of spiral grooves are symmetrically arranged on the middle outer wall of the driving rod, and the upper and lower ends of the two groups of spiral grooves are connected. The outer side of the driving rod is symmetrically slidingly connected to two driving half-cylinders, and a sliding rod is arranged on the inner side of the driving half-cylinder. The sliding rods on the two driving half-cylinders are symmetrically arranged on the upper and lower sides of the driving half-cylinder. The end of the sliding rod is rotatably connected to a swing block, and the swing block is slidably inserted in the spiral groove. The two screening rings are respectively fixed on the outer walls of the driving half-cylinder.

3. A rotary vacuum screening device according to claim 2, characterized in that: A sliding groove is arranged on one side of the screening plate facing the screening frame, and a sliding convex strip is arranged on the inner wall of the screening frame, and the sliding convex strip slides through the sliding groove.

4. A rotary vacuum screening device according to claim 3, characterized in that: The height difference between the upper and lower ends of the spiral chute is less than the sum of the thicknesses of the two screening plates, and the number of spiral turns of the spiral chute is 0.5×(2n+1) turns.

5. A rotary vacuum screening device according to claim 4, characterized in that: The outer wall of the driving half-cylinder is provided with a fan-shaped groove, and a height-adjusting screw is rotatably connected to the top wall of the fan-shaped groove. A guide rod is fixed in the fan-shaped groove, and a height-adjusting spring is sleeved on the guide rod. The inner wall of the screening ring is provided with a fan-shaped plate that matches the fan-shaped groove in a concave and convex manner. A height-adjusting screw hole is provided in the middle of the fan-shaped plate, and the height-adjusting screw is threadedly connected and passes through the height-adjusting screw hole. A guide hole is provided on the fan-shaped plate, and the guide rod passes through the guide hole. The two ends of the height-adjusting spring are respectively fixed on the fan-shaped plate and the driving half-cylinder.

6. A rotary vacuum screening device according to claim 5, characterized in that: The top of the driving rod is set as a threaded rod, and a threaded sleeve is threadedly connected to the threaded rod. A connecting top plate is fixed on the top of the threaded sleeve, and a sealing ring protrudes outward from the connecting top plate. A plurality of sealing guide rods are arranged downwardly on the sealing ring. The outer wall of the sealing guide rod is sleeved with a sealing spring, and the outer edge of the sealing ring is slidably connected with a sealing sleeve. A connecting ring is arranged in the middle of the inner wall of the sealing sleeve, and the sealing guide rod is slidably passed through the connecting ring. The upper and lower ends of the sealing spring are respectively fixed between the sealing ring and the connecting ring, and the lower end of the sealing sleeve is in contact with the screening ring. The upper end of the connecting top plate is connected with a guide cone cover, and the guide cone cover is arranged on the outside of the sealing sleeve.

7. A rotary vacuum screening device according to claim 6, characterized in that: A motor sleeve is fixed in the middle of the bottom shell, the screening motor is placed inside the motor sleeve, an inner concave ring is arranged on the top of the motor sleeve, the output end of the screening motor passes through the middle of the inner concave ring, and the top of the inner concave ring abuts against the lower side of the driving rod.

8. The rotary vacuum screening device according to claim 7, characterized in that: The upper side of the inner wall of the half-hole is set as a vertical surface, and the lower side of the inner wall of the half-hole is set as an inscribed inclined surface.

9. The rotary vacuum screening device according to claim 8, characterized in that: The vibration assembly includes a vibration sleeve, a vibration motor and a vibration spring. The vibration sleeve is fixed at the middle part of the lower side of the bottom shell. The vibration motor is installed inside the vibration sleeve. An eccentric block is installed at the output end of the vibration motor. A plurality of vibration guide rods are distributed circumferentially at the lower end of the bottom shell. The vibration guide rods are slidably penetrated on the top of the base. The vibration spring is sleeved on the vibration guide rods. The upper and lower ends of the vibration spring respectively abut against the bottom shell and the base.

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