CN211412756U - Multistage gangue screening plant of high efficiency - Google Patents

Abstract

The utility model discloses a multistage gangue screening plant of high efficiency, the on-line screen storage device comprises a base, the base top is equipped with the screening box, the screening bottom half is close to the left and right sides first montant of fixedly connected with respectively, and two first montant bottom difference fixedly connected with pulleys, the base top seted up with the first spout of pulley assorted, the L shaped plate is all installed to the screening box left and right sides, the screening box left and right sides inner chamber lateral wall is close to top department and all installs first bearing, and first bearing inner circle swing joint has the pivot, screening box top is equipped with two feed plates, and one side that two feed plates kept away from mutually respectively with two pivot fixed connection on the first bearing, thereby can realize the screening processing to the gangue, and then can reach quick ejection of compact, screening efficiency is high and the good purpose of dust removal effect.

Description

Multistage gangue screening plant of high efficiency

Technical Field

The utility model relates to a gangue screening technical field specifically is a multistage gangue screening plant of high efficiency.

Background

The coal gangue is a solid waste discharged in the coal mining process and the coal washing process, is a black and gray rock which has lower carbon content and is harder than coal and is associated with a coal bed in the coal forming process, and needs to be screened for secondary utilization of the coal gangue.

Disclosure of Invention

The utility model provides a technical problem lie in overcoming prior art's screening efficiency low and dust removal effect defect such as poor, provide a multistage gangue screening plant of high efficiency. A multistage gangue screening plant of high efficiency has characteristics such as screening efficiency is high and dust removal effect is good.

In order to achieve the above object, the utility model provides a following technical scheme: a high-efficiency multistage coal gangue screening device comprises a base, wherein a screening box body is arranged at the top of the base, the bottom of the screening box body is close to the left side and the right side and is respectively and fixedly connected with a first vertical rod, the bottom ends of the two first vertical rods are respectively and fixedly connected with pulleys, the top of the base is provided with a first chute matched with the pulleys, L-shaped plates are respectively arranged at the left side and the right side of the screening box body, first bearings are respectively arranged at the positions, close to the tops, of the side walls of inner cavities at the left side and the right side of the screening box body, the inner rings of the first bearings are movably connected with a rotating shaft, two feeding plates are arranged above the screening box body, the far sides of the two feeding plates are respectively and fixedly connected with the rotating shafts on the two first bearings, a first screen is arranged in the screening, the screening box is internally provided with a second screen, the second screen is located below the first screen, a second discharge port is formed in the side wall of the left side of the screening box, the bottom of the second discharge port is fixedly connected with the left side of the second screen, a discharge pipe is arranged below the second screen, the front side of the screening box below the discharge pipe is arranged as an opening, a third discharge box is arranged below the discharge pipe, the side walls of the two sides of the discharge pipe are close to the bottom and the side walls of the two sides of the third discharge box, and are close to the top and are provided with screw holes, screws are inserted into the screw holes, the bottom of the third discharge box is close to the left side and the right side and is fixedly connected with second vertical rods, the bottom of the two second vertical rods is fixedly connected with second sliders respectively, and a second chute matched with the second sliders is formed.

Preferably, one side that the L shaped plate is close to the screening box installs first connecting piece, and installs the second bearing on the antetheca of first connecting piece, the inner circle swing joint of second bearing has the pivot, and changes epaxial fixedly connected with hydraulic stem, install the second connecting piece on the feed plate, and the antetheca of second connecting piece installs the third bearing, the inner circle swing joint of third bearing has the pivot, and the one end and the pivot fixed connection of L shaped plate are kept away from to the hydraulic stem.

Preferably, a transverse plate is fixedly connected between the L-shaped plate on the left side and the screening box body, a first discharging box is arranged above the transverse plate, the top of the first discharging box is provided with an opening, the right side of the first discharging box is fixedly connected with the bottom of the first discharging hole, the bottom of the first discharging box is respectively and fixedly connected with a third vertical rod, the bottom ends of the two third vertical rods are fixedly connected with a third slide block, the top of the transverse plate is provided with a third slide groove matched with the third slide block, a second discharging box is arranged above the L-shaped plate positioned on the left side, the top of the second discharging box is provided with an opening, the right side of the second discharging box is fixedly connected with the bottom of the second discharging hole, the bottom of the second discharging box is respectively and fixedly connected with a fourth vertical rod, and the bottom ends of the two fourth vertical rods are fixedly connected with fourth sliding blocks, and the top of the L-shaped plate positioned on the left side is provided with a fourth sliding groove matched with the fourth sliding blocks.

Preferably, be located the right side L shaped plate top is equipped with the dust collection box, the bottom of dust collection box is close to left and right sides difference fixedly connected with fifth montant, and the bottom fixedly connected with fifth slider of fifth montant, is located the right side L shaped plate top seted up with fifth slider assorted fifth spout, the dust collection box top is equipped with the dust absorption pipe, the dust collection box top seted up with dust absorption pipe assorted through-hole, and the bottom of dust absorption pipe passes the through-hole and is linked together with the dust collection box is inside, the equal fixedly connected with sealing plug of through-hole at dust collection box top, install the dust absorption pump on the dust absorption pipe, screening box right side lateral wall seted up with dust absorption pipe assorted jack, and the left end of dust absorption pipe passes the jack and is linked together with screening box internal portion.

Preferably, all be equipped with the scraper blade on first screen cloth and the second screen cloth, the equal fixedly connected with curb plate in scraper blade both sides, and the equal fixedly connected with quarter butt in one side that the curb plate is close to the quarter butt one end fixedly connected with sixth slider of curb plate is kept away from, all set up on the both sides lateral wall of first screen cloth and second screen cloth with sixth slider assorted spout, be located the right side two electric telescopic handle of one side fixedly connected with that the L shaped plate is close to the screening box, and screen box right side lateral wall set up two with electric telescopic handle assorted through-hole, two electric telescopic handle keeps away from the one end of L shaped plate and passes the through-hole respectively with two scraper blade fixed connection.

Preferably, an arc-shaped plate is installed on the top of the base close to the right side, a fourth bearing is installed on the front wall of the arc-shaped plate, a rotating shaft is movably connected to the inner ring of the fourth bearing, a first connecting rod is fixedly connected to the front end of the rotating shaft, a driving motor is installed on the top of the base close to the right side, a transmission belt is connected between the output shaft of the driving motor and the rotating shaft on the arc-shaped plate in a transmission manner, a fifth bearing is installed on the front wall of the first connecting rod close to the top end, a rotating shaft is movably connected to the inner ring of the fifth bearing, a second connecting rod is fixedly connected to the front end of the rotating shaft, a sixth bearing is installed on the front wall of the second connecting rod close to the left end, a rotating shaft is movably connected to the inner ring of the sixth bearing, a third connecting rod is fixedly connected to the front end of the rotating shaft, two gears, the base top is equipped with the round bar, and round bar bottom and base top all be equipped with gear assorted rack, the straight-bar is installed at the base top, and straight-bar top fixedly connected with pipe, the round bar left end passes the pipe to extend to the pipe outside and screening box right side lateral wall fixed connection, the thick pipe of straight-bar left side fixedly connected with, and the thick intraductal tubule that is equipped with, the tubule left end passes thick pipe left end mouth of pipe and screening box right side lateral wall fixed connection, the cover is equipped with the spring on the tubule, and the spring about both ends respectively with screening box right side lateral wall and thick pipe left end fixed connection.

Compared with the prior art, the beneficial effects of the utility model are that:

1. in the technical scheme, the two feeding plates can be driven to turn outwards through the two hydraulic rods, feeding is achieved, and the screening box body can be pushed to move left and right under the mutual matching of the driving motor, the gear, the rack, the round rod, the round pipe, the first connecting rod, the second connecting rod and the third connecting rod, so that screening is more efficient, and screening efficiency is effectively improved;

2. in the technical scheme, the thick pipe, the thin pipe and the spring are matched with each other, so that the screening box can play a role in buffering protection in the left-right moving process, the scraper and the electric telescopic rod can clean the residual coal gangue on the first screen and the second screen, and the influence of the residual coal gangue on the next screening is prevented;

3. in the technical scheme, the dust collection box, the dust collection pipe and the dust collection pump can be arranged to clean dust generated in the screening process, so that the dust collection effect is improved, and the fifth slide block and the fifth slide groove can be used for discharging and cleaning the dust in the dust collection box;

4. in this technical scheme, drive first ejection of compact case, second ejection of compact case and third ejection of compact case and carry out the quick ejection of compact through the setting of second slider, second spout, third slider, third spout, fourth slider and fourth spout to can reach quick ejection of compact, screening efficiency height and the good purpose of dust removal effect.

Drawings

Fig. 1 is an original structure diagram of the present invention.

Fig. 2 is a side view of the squeegee of fig. 1.

Fig. 3 is an enlarged view of a portion a in fig. 1.

Reference numbers in the figures: 1. a base; 2. screening the box body; 3. a first screen; 4. a second screen; 5. an L-shaped plate; 6. a hydraulic lever; 7. a feeding plate; 8. a first discharging box; 9. a second discharging box; 10. a third discharging box; 11. an electric telescopic rod; 12. a dust suction pump; 13. a dust collection box; 14. a drive motor; 15. a first link; 16. a second link; 17. a third link; 18. a round bar; 19. a rack; 20. a gear; 21. a squeegee; 22. a circular tube; 23. a thick pipe; 24. a thin tube; 25. a spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a high-efficiency multistage coal gangue screening device comprises a base 1, a screening box body 2 is arranged at the top of the base 1, first vertical rods are respectively and fixedly connected to the bottom of the screening box body 2 close to the left side and the right side, pulleys are respectively and fixedly connected to the bottom ends of the two first vertical rods, first chutes matched with the pulleys are formed in the top of the base 1, L-shaped plates 5 are respectively installed on the left side and the right side of the screening box body 2, first bearings are respectively installed on the side walls of inner cavities on the left side and the right side of the screening box body 2 close to the top, rotating shafts are movably connected to the inner rings of the first bearings, two feeding plates 7 are arranged above the screening box body 2, the side far away from the two feeding plates 7 is respectively and fixedly connected with the rotating shafts on the two first bearings, a first screen 3 is arranged in the screening box body 2, a first, a second screen 4 is arranged in the screening box body 2, the second screen 4 is positioned below the first screen 3, a second discharge hole is formed in the side wall of the left side of the screening box body 2, the bottom of the second discharge hole is fixedly connected with the left side of the second screen 4, a discharge pipe is arranged below the second screen 4, the front side of the screening box body 2 positioned below the discharge pipe is provided with an opening, a third discharge box 10 is arranged below the discharge pipe, screw holes are formed in the positions, close to the bottom, of the side walls of the two sides of the discharge pipe and the positions, close to the top, of the side walls of the two sides of the third discharge box 10, screws are inserted into the screw holes, second vertical rods are respectively and fixedly connected to the positions, close to the left side and the right side, of the bottom of the third discharge box 10, second slide blocks are respectively and fixedly connected to the bottoms of the two second vertical rods, a second slide groove matched, a second bearing is arranged on the front wall of the first connecting piece, the inner ring of the second bearing is movably connected with a rotating shaft, a hydraulic rod 6 is fixedly connected with the rotating shaft, a second connecting piece is arranged on the feeding plate 7, a third bearing is arranged on the front wall of the second connecting piece, the inner ring of the third bearing is movably connected with the rotating shaft, one end of the hydraulic rod 6, far away from the L-shaped plate 5, is fixedly connected with the rotating shaft, the two feeding plates 7 can be driven by the two hydraulic rods 6 to turn outwards to realize feeding, a transverse plate is fixedly connected between the L-shaped plate 5 on the left side and the screening box body 2, a first discharging box 8 is arranged above the transverse plate, the top of the first discharging box 8 is provided with an opening, the right side of the first discharging box 8 is fixedly connected with the bottom of a first discharging hole, the bottom of the first discharging box 8 is respectively and fixedly connected with a third vertical rod, a third chute matched with the third slide block is formed in the top of the transverse plate, a second discharging box 9 is arranged above the L-shaped plate 5 on the left side, the top of the second discharging box 9 is arranged in an opening mode, the right side of the second discharging box 9 is fixedly connected with the bottom of the second discharging port, fourth vertical rods are fixedly connected to the bottom of the second discharging box 9 respectively, fourth slide blocks are fixedly connected to the bottom ends of the two fourth vertical rods, a fourth chute matched with the fourth slide blocks is formed in the top of the L-shaped plate 5 on the left side, a dust collecting box 13 is arranged above the L-shaped plate 5 on the right side, fifth vertical rods are fixedly connected to the bottom of the dust collecting box 13 close to the left side and the right side respectively, a fifth slide block is fixedly connected to the bottom end of the fifth vertical rods, a fifth chute matched with the fifth slide block is formed in the top of the L-shaped plate 5 on the right side, The fourth slide block and the fourth chute are arranged to drive the first discharging box 8, the second discharging box 9 and the third discharging box 10 to rapidly discharge materials, a dust suction pipe is arranged above the dust collection box 13, a through hole matched with the dust suction pipe is formed in the top of the dust collection box 13, the bottom end of the dust suction pipe penetrates through the through hole and is communicated with the inside of the dust collection box 13, the through hole in the top of the dust collection box 13 is fixedly connected with a sealing plug, a dust suction pump 12 is installed on the dust suction pipe, a jack matched with the dust suction pipe is formed in the side wall of the right side of the screening box 2, the left end of the dust suction pipe penetrates through the jack and is communicated with the inside of the screening box 2, the dust collection box 13, the dust suction pipe and the dust suction pump 12 are arranged to clean dust generated in the screening process, the dust removal effect of the dust collection box is improved, the fifth slide block and the fifth chute can realize discharging and cleaning of the dust in, both sides of the scraper 21 are fixedly connected with side plates, one side, close to the side plates, of each short rod is fixedly connected with a short rod, one end, far away from the side plates, of each short rod is fixedly connected with a sixth slider, the side walls of both sides of the first screen 3 and the second screen 4 are respectively provided with a sixth chute matched with the sixth slider, one side, close to the screening box body 2, of the L-shaped plate 5 on the right side is fixedly connected with two electric telescopic rods 11, the side wall of the right side of the screening box body 2 is provided with two through holes matched with the electric telescopic rods 11, one ends, far away from the L-shaped plate 5, of the two electric telescopic rods 11 penetrate through the through holes and are respectively and fixedly connected with the two scraper 21, the arrangement of the scraper 21 and the electric telescopic rods 11 can realize the cleaning of residual coal gangue on the;

an arc-shaped plate is arranged on the top of the base 1 close to the right side, a fourth bearing is arranged on the front wall of the arc-shaped plate, a rotating shaft is movably connected to the inner ring of the fourth bearing, a first connecting rod 15 is fixedly connected to the front end of the rotating shaft, a driving motor 14 is arranged on the top of the base 1 close to the right side, a transmission belt is connected between the output shaft of the driving motor 14 and the rotating shaft on the arc-shaped plate in a transmission manner, a fifth bearing is arranged on the front wall of the first connecting rod 15 close to the top end, a rotating shaft is movably connected to the inner ring of the fifth bearing, a second connecting rod 16 is fixedly connected to the front end of the rotating shaft, a sixth bearing is arranged on the front wall of the second connecting rod 16 close to the left end, a rotating shaft is movably connected to the inner ring of the sixth bearing, a third connecting rod 17 is fixedly connected to the front end of the rotating shaft, two, a round bar 18 is arranged above the base 1, racks 19 matched with a gear 20 are arranged at the bottom of the round bar 18 and the top of the base 1, a straight bar is arranged at the top of the base 1, a round pipe 22 is fixedly connected to the top end of the straight bar, the left end of the round bar 18 penetrates through the round pipe 22 and extends out of the round pipe 22 to be fixedly connected with the right side wall of the screening box 2, a driving motor 14, a gear 20, a rack 19, the round bar 18, the round pipe 22, a first connecting rod 15, a second connecting rod 16 and a third connecting rod 17 are matched with each other, the screening box 2 can be pushed to move left and right, screening efficiency is improved effectively, a thick pipe 23 is fixedly connected to the left side of the straight bar, a thin pipe 24 is arranged in the thick pipe 23, the left end of the thin pipe 24 penetrates through a left end pipe orifice of the thick pipe 23 to be fixedly connected with the right side wall of the screening box 2, a spring 25 is sleeved on the thin pipe 24, through the mutual cooperation of the thick pipe 23, the thin pipe 24 and the spring 25, the effect of buffer protection can be realized in the left-right moving process of the screening box body 2, so that the purposes of quick discharging, high screening efficiency and good dust removal effect can be achieved, the hydraulic rod 6, the electric telescopic rod 11, the dust collection pump 12 and the driving motor 14 are respectively electrically connected with a control switch through an external power line, the model of the electric telescopic rod 11 is TF12-100, the model of the driving motor 14 is Y2-132M-4 pole, the model of the dust collection pump 12 is NEG-8560BB-24V, and the model of the hydraulic rod 6 is YTZ 450-/110.

The working principle is as follows: in this technical scheme, at first start hydraulic stem 6, drive two feeding plates 7 through two hydraulic stems 6 and outwards overturn and realize the feeding of gangue, start driving motor 14 after that, driving motor 14 is through first connecting rod 15, second connecting rod 16 and third connecting rod 17 drive two gears 20 and rotate, gear 20 drives round bar 18 through rack 19 and controls the removal, round bar 18 removes through pulley promotion screening box 2 and controls, it is more high-efficient to make its screening, thereby effectual improvement screening efficiency, thick pipe 23, mutually supporting of tubule 24 and spring 25, can realize removing the effect that the in-process played the buffering protection about screening box 2, start electric telescopic handle 11 after that, two electric telescopic handle 11 promote scraper blade 21 on first screen cloth 3 and the second screen cloth 4 through sixth slider and sixth spout and carry out the left movement, thereby realize that the gangue that promotes first screen cloth 3 and second screen cloth 4 goes out workbin 8 and the second play workbin and go out workbin 9 in, insert the jack to the dust absorption pipe after that, start dust absorption pump 12, dust absorption pump 12 inhales the dust collection box 13 through the dust absorption pipe in with the dust, thereby realize clearing up the dust in screening box 2, improve its dust removal effect, pulling dust collection box 13, make the fifth slider slide in the fifth spout, thereby realize clearing up the dust in the dust collection box 13, after the screening, stimulate first ejection of compact case 8 respectively, second ejection of compact case 9 and third ejection of compact case 10, through the second slider, third slider and fourth slider slide in the second spout, it carries out the ejection of compact to slide in third spout and the fourth spout, thereby can reach quick ejection of compact, the screening is efficient and the good purpose of dust removal effect.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a multistage gangue screening plant of high efficiency, includes base (1), its characterized in that: the screening box body (2) is arranged at the top of the base (1), first vertical rods are fixedly connected to the bottom of the screening box body (2) close to the left side and the right side respectively, pulleys are fixedly connected to the bottoms of the two first vertical rods respectively, first sliding grooves matched with the pulleys are formed in the top of the base (1), L-shaped plates (5) are mounted on the left side and the right side of the screening box body (2), first bearings are mounted on the inner cavity side walls of the left side and the right side of the screening box body (2) close to the top respectively, rotating shafts are movably connected to inner rings of the first bearings, two feeding plates (7) are arranged above the screening box body (2), one sides, far away from the two feeding plates (7), of the two feeding plates are fixedly connected with the rotating shafts on the two first bearings respectively, a first screen (3) is arranged in the screening box body (, and the bottom of the first discharge port is fixedly connected with the left side of the first screen (3), a second screen (4) is arranged in the screening box body (2), the second screen (4) is positioned below the first screen (3), the left side wall of the screening box body (2) is provided with a second discharge port, the bottom of the second discharge port is fixedly connected with the left side of the second screen (4), a discharge pipe is arranged below the second screen (4), the front side of the screening box body (2) positioned below the discharge pipe is provided with an opening, a third discharge box (10) is arranged below the discharge pipe, screw holes are respectively formed in the positions, close to the bottom, of the side walls at two sides of the discharge pipe and the positions, close to the top, of the side walls at two sides of the third discharge box (10), screws are inserted into the screw holes, the positions, close to the left side and the right side, of the bottom of the third discharge box (10) are respectively and fixedly connected with a second vertical rod, and a second sliding groove matched with the second sliding block is formed in the bottom of the inner cavity of the screening box body (2).

2. The high-efficiency multistage coal gangue screening device as claimed in claim 1, wherein: l shaped plate (5) are close to one side of screening box (2) and install first connecting piece, and install the second bearing on the antetheca of first connecting piece, the inner circle swing joint of second bearing has the pivot, and changes epaxial fixedly connected with hydraulic stem (6), install the second connecting piece on feed plate (7), and the antetheca of second connecting piece installs the third bearing, the inner circle swing joint of third bearing has the pivot, and the one end and the pivot fixed connection of L shaped plate (5) are kept away from in hydraulic stem (6).

3. The high-efficiency multistage coal gangue screening device as claimed in claim 1, wherein: a transverse plate is fixedly connected between the left L-shaped plate (5) and the screening box body (2), a first discharging box (8) is arranged above the transverse plate, the top of the first discharging box (8) is arranged in an opening manner, the right side of the first discharging box (8) is fixedly connected with the bottom of a first discharging port, the bottom of the first discharging box (8) is respectively and fixedly connected with a third vertical rod, the bottom of the two third vertical rods is fixedly connected with a third sliding block, the top of the transverse plate is provided with a third sliding chute matched with the third sliding block, a second discharging box (9) is arranged above the left L-shaped plate (5), the top of the second discharging box (9) is arranged in an opening manner, the right side of the second discharging box (9) is fixedly connected with the bottom of the second discharging port, the bottom of the second discharging box (9) is respectively and fixedly connected with a fourth vertical rod, and the bottom of the two fourth vertical rods is fixedly connected with a fourth sliding block, and a fourth sliding groove matched with the fourth sliding block is formed in the top of the L-shaped plate (5) on the left side.

4. The high-efficiency multistage coal gangue screening device as claimed in claim 3, wherein: a dust collection box (13) is arranged above the L-shaped plate (5) on the right side, the bottom of the dust collection box (13) close to the left side and the right side is fixedly connected with a fifth vertical rod respectively, the bottom end of the fifth vertical rod is fixedly connected with a fifth sliding block, the top of the L-shaped plate (5) positioned on the right side is provided with a fifth sliding chute matched with the fifth sliding block, a dust suction pipe is arranged above the dust collection box (13), a through hole matched with the dust suction pipe is arranged at the top of the dust collection box (13), the bottom end of the dust collection pipe penetrates through the through hole to be communicated with the interior of the dust collection box (13), the through holes at the top of the dust collection box (13) are fixedly connected with sealing plugs, install dust absorption pump (12) on the dust absorption pipe, screening box (2) right side lateral wall seted up with dust absorption pipe assorted jack, and the left end of dust absorption pipe passes the jack and is linked together with screening box (2) inside.

5. The high-efficiency multistage coal gangue screening device as claimed in claim 1, wherein: all be equipped with scraper blade (21) on first screen cloth (3) and second screen cloth (4), the equal fixedly connected with curb plate in scraper blade (21) both sides, and the equal fixedly connected with quarter butt in one side that the curb plate is close to the one end fixedly connected with sixth slider of curb plate is kept away from to the quarter butt, all seted up on the both sides lateral wall of first screen cloth (3) and second screen cloth (4) with sixth slider assorted sixth spout, be located the right side two electric telescopic handle (11) of one side fixedly connected with of screening box (2) are close to L shaped plate (5), and screen box (2) right side lateral wall set up two with electric telescopic handle (11) assorted through-hole, two the one end that L shaped plate (5) were kept away from in electric telescopic handle (11) passes the through-hole respectively with two scraper blade (21) fixed connection.

6. The high-efficiency multistage coal gangue screening device as claimed in claim 1, wherein: the arc-shaped plate is installed at the position, close to the right side, of the top of the base (1), a fourth bearing is installed on the front wall of the arc-shaped plate, the inner ring of the fourth bearing is movably connected with a rotating shaft, a first connecting rod (15) is fixedly connected with the front end of the rotating shaft, a driving motor (14) is installed at the position, close to the right side, of the top of the base (1), the output shaft of the driving motor (14) is in transmission connection with the rotating shaft on the arc-shaped plate, a fifth bearing is installed at the position, close to the top end, of the front wall of the first connecting rod (15), a rotating shaft is movably connected with the inner ring of the fifth bearing, a second connecting rod (16) is fixedly connected with the front end of the rotating shaft, a sixth bearing is installed at the position, close to the left end, of the front wall of the second connecting rod, and all be equipped with seventh bearing and pivot on the antetheca of two gears (20), the both ends of third connecting rod (17) respectively with two gears (20) on pivot fixed connection, base (1) top is equipped with round bar (18), and round bar (18) bottom and base (1) top all be equipped with gear (20) assorted rack (19), the straight-bar is installed at base (1) top, and straight-bar top fixedly connected with pipe (22), round bar (18) left end passes pipe (22) to extend to pipe (22) outer with screening box (2) right side lateral wall fixed connection, straight-bar left side fixedly connected with thick pipe (23), and be equipped with tubule (24) in thick pipe (23), thick pipe (23) left end is passed thick pipe (23) left end mouth of pipe and screening box (2) right side lateral wall fixed connection, the cover is equipped with spring (25) on tubule (24), and the left end and the right end of the spring (25) are respectively fixedly connected with the right side wall of the screening box body (2) and the left end of the thick pipe (23).

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