CN113171877A

CN113171877A - Aggregate screening plant is retrieved to building

Info

Publication number: CN113171877A
Application number: CN202110732358.3A
Authority: CN
Inventors: 王烨嘉
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-07-27
Anticipated expiration: 2041-06-30
Also published as: CN113171877B

Abstract

The invention discloses a building recycled aggregate screening device which comprises a frame, wherein the discharge end of a primary conveyor belt corresponds to a feed inlet of a screening cavity, a screening barrel is arranged in the screening cavity, a screening roller is rotatably arranged in the screening barrel, a plurality of air suction pipes are sequentially arranged in the air suction cavities, a plurality of shifting forks are arranged on the outer circumferential wall of the screening roller along the radial direction of the screening roller, air holes are formed between every two adjacent shifting forks, two arc-shaped air exhaust cavities with open end faces are arranged on the inner wall of the screening barrel, a discharge port is arranged between the two air exhaust cavities, the open ends of the air exhaust cavities are completely sealed through a filter screen, and a plurality of exhaust pipes are arranged in each air exhaust cavity. The invention can perform screening and dedusting treatment on the recycled aggregate, and prevent the aggregate from causing dust pollution to the periphery during transportation.

Description

Aggregate screening plant is retrieved to building

Technical Field

The invention relates to the field of building aggregate screening, in particular to a building recycled aggregate screening device.

Background

The construction waste recycled aggregate is as follows: the construction waste is crushed and screened to form materials with different specifications, the materials have good water permeability, do not swell in the presence of water and shrink, and then cement, water and the like are added to form the recycled concrete. When carrying out production to the regeneration aggregate, be mingled with a large amount of piece granule and dust in the fashioned aggregate, unable direct input is used, can't satisfy the preparation requirement of concrete promptly, and along with multistage conveyor's transport, and then lead to whole aggregate processing environment to be covered with the raise dust, not only cause the interference to staff's normal operating, still can lead to the more dust of adhesion on the treatment facility, influence treatment facility's heat dissipation function, and the dust of everywhere loss when open-air construction can also cause peripheral environmental pollution, be not conform to the requirement of green construction now.

Disclosure of Invention

The invention aims to provide a building recycled aggregate screening device which is used for carrying out airflow screening on molded aggregates to ensure that dust mixed in the aggregates is completely screened out so as to be convenient for direct use in preparation of recycled concrete.

The invention is realized by the following technical scheme: a building recycled aggregate screening device comprises a rack, wherein a primary conveyor belt and a screening cavity are sequentially arranged on the rack, a feeding port and a discharging port are respectively arranged at two ends of the screening cavity, a discharging end of the primary conveyor belt corresponds to the feeding port of the screening cavity, a screening cylinder is arranged in the screening cavity, a feeding port of the screening cylinder is communicated with the feeding port, and a discharging port of the screening cylinder is communicated with the discharging port; the screening roller is rotationally arranged in the screening barrel, an air suction cavity is formed in the screening roller along the circumferential direction of the screening roller, a plurality of air suction pipes with axes parallel to the axes of the screening roller are sequentially arranged in the air suction cavity, a plurality of shifting forks are uniformly arranged on the outer circumferential wall of the screening roller along the radial direction of the screening roller, air holes communicated with the annular air suction cavities are formed between every two adjacent shifting forks, two air exhaust cavities with arc-shaped end faces and open end faces are arranged on the inner wall of the screening barrel, the two air exhaust cavities are symmetrically distributed along the axes of the screening roller, a discharge port is formed between the two air exhaust cavities, the open ends of the air exhaust cavities are completely sealed through filter screens, and a plurality of exhaust pipes are arranged in each air exhaust cavity.

Aiming at the problem that a large amount of suspended dust is generated during conveying of the currently formed building rubbish aggregate, the invention designs a screening device; when carrying out aggregate dust removal screening, the air current that erupts in the blast pipe screens the aggregate in the screening section of thick bamboo, and the dust that mix with in the aggregate is adsorbed to the aspiration channel in through the bleeder vent after, and then guarantees not have the raise dust when the aggregate is carried, avoids causing dust pollution to the periphery. In the specific operation: the formed aggregate enters the feed inlet through the primary conveyor belt and then moves into the screening cylinder, the exhaust pipe, the air suction pipe and the exhaust fan connected with the exhaust pipe in the screening cylinder are all started, namely the exhaust pipe begins to exhaust high-speed gas in the screening cylinder, the exhausted gas forms a plurality of air flows and is directly sprayed to the outer wall of the screening roller, the air suction pipes on the screening roller begin to suck the gas exhausted by the exhaust pipe, the exhaust pipes in the two exhaust cavities form two air curtains in the screening cylinder at the moment, the aggregate transferred into the screening cylinder from the feed inlet directly sweeps over the two air curtains, dust and particles with extremely small size mixed in the formed aggregate enter the air suction pipe through the air holes, then the formed aggregate is intensively exhausted out of the screening cylinder through the exhaust pipes, finally the formed aggregate is collected and processed by the existing dust collecting equipment such as a dust collecting cloth bag and the like, and finally the formed aggregate is discharged to the discharge outlet from the discharge outlet of the screening cylinder, the aggregate of final shaping promptly can not have the dust in convenient piling up or transporting, avoids causing dust pollution in follow-up multistage conveying or transportation, ensures that the shaping aggregate can directly put into use.

Further, the air output of blast pipe and the pump drainage volume homoenergetic of breathing pipe are adjusted, and the pump drainage function of breathing pipe lasts the effect, the gravity of the aggregate that accords with the standard in the screening section of thick bamboo and the produced power of support cylinder rotation enough offset the blast pipe in the produced impact force of release gas, and the dust that mix with in the aggregate then can enter into the breathing pipe smoothly because of volume and weight are less, and then guarantee that no dust is gone out in the discharge gate department of screening section of thick bamboo, and the bore of discharge gate is less for the size of pan feeding mouth or discharge gate when in-service, outside air receives the influence of breathing pipe less. And because the air suction pipe is arranged inside the supporting cylinder, the supporting cylinder can continuously rotate, so as to avoid the interference between the movement of the air suction pipe and the rotation of the screening roller, in the technical scheme, the air suction pipe and the screening roller can be designed into a whole, namely, two ends of the screening cylinder are arranged into an open shape, two open ends of the screening cylinder are rotatably provided with cover plates, the end parts of a plurality of air suction pipes and a rotating shaft of the screening roller penetrate through the cover plates and then horizontally extend outwards, the extension sections of the air suction pipes penetrate through the sealing plates and then form a whole with the sealing plates, a cylindrical air suction pipe joint is arranged on the screening cylinder, one end of the air suction pipe joint is closed, the other end of the air suction pipe joint is open, a bearing is arranged in the open end of the air suction pipe joint, the extension sections of the air suction pipes are fixed with the inner ring of the bearing, the sealing plates realize dynamic sealing with the open end of the air suction pipe joint, and the air suction pipe joint is connected with the air inlet end of the air suction fan, the air suction pipe can normally pump and discharge air while rotating along with the screening roller. To sum up, this technical scheme is through setting up a plurality of air current injection structures in a screening section of thick bamboo, and spun air current can be to screening the aggregate through a screening section of thick bamboo, and this air current can not influence the normal removal of the aggregate that the size meets the requirements, and the aggregate after being screened is then directly through arranging material discharge, and a plurality of breathing pipes in the suction cavity then can carry out the pump drainage to the air current that the blast pipe sprayed and the dust that mix with in the aggregate, avoid the amount of wind of gathering in a screening section of thick bamboo too big and cause the air current overflow.

The exhaust cavity is minor arc-shaped, and the central angle of the circular arc where the exhaust cavity is located corresponds to 60-90 degrees. Further, be equipped with a plurality of blast pipes in the exhaust cavity, the air current of spraying in the blast pipe can be screened the dust that is mingled with in the aggregate when removing, make the dust can follow the bleeder vent and enter into to the breathing pipe, and the level of screening section of thick bamboo is lower, set the exhaust cavity into the bad arcuation, and the central angle that the circular arc that the exhaust cavity place corresponds 60~90, in the shared space of feed inlet and the bin outlet of detaching the screening section of thick bamboo, the air current of spraying can be completely will be removed the aggregate cover to in the screening section of thick bamboo by the pan feeding mouth in the blast pipe, and then the improvement is to the screening efficiency of dust.

The inner wall of the air suction cavity is provided with a screen matched with the air suction cavity along the circumferential direction of the air suction cavity, the air holes are separated from the inner part of the air suction cavity by the screen, and the aperture of the filtering holes on the screen is smaller than that of the air holes. Further, for preventing that the dust in the cavity of breathing in from appearing piling up and can't in time outwards discharging through the breathing pipe, set up the screen cloth in the cavity of breathing in, and the filtration pore aperture on the filter screen is less than the aperture of bleeder vent, can filter the separation once more to the tiny aggregate that adheres to on the screening roller outer wall, prevent simultaneously that the breathing pipe from appearing blockking up.

A plurality of blast pipes are at the internal equidistance interval distribution of exhaust cavity, at each blast pipe all opens a plurality of fumaroles on just to screening roller's a lateral wall, and a plurality of fumaroles on two adjacent blast pipes crisscross distribution, each the fumarole is the same with the interval of screening roller outer circumferential wall. Further, the blast pipe is as the important part of screening dust, and its air current that erupts has direct influence to the screening effect, consequently, for the maximize that realizes the screening effect, be located a plurality of blast pipes equidistance interval distribution in same exhaust cavity promptly, and be located a plurality of fumaroles staggered distribution on two adjacent blast pipes, a plurality of air currents of formation form a plurality of evenly distributed's air current on screening roller outer wall behind the filter screen, and a great deal of air current can cover the aggregate through screening roller completely.

The inside diameter of the through hole decreases progressively from inside to outside along the radial direction of the exhaust pipe. Furthermore, the movement track of the aggregate in the screening cylinder is disordered and irregular, so that compared with the linear airflow jetted by the exhaust pipe, the disordered airflow acting on the moving aggregate can improve the screening efficiency of the dust mixed in the aggregate, in contrast, in the technical scheme, a ball head is rotatably arranged in the gas ejecting hole, a through hole is formed in the middle of the ball head, a rubber hose is arranged at the outer side end of the ball head, gas in the exhaust pipe enters the rubber hose after passing through the through hole, because the rubber hose has stronger deformation capability and the through hole with the inner diameter decreasing from inside to outside can accelerate the gas due to the change of the flow section, namely, the rubber hose can generate non-directional swing in a short time when the air flows through, so that the air flow passing through the filter screen can be continuously redirected, carry out unordered impact to the aggregate that removes, and then improve the screening efficiency to the dust that is mingled with in the aggregate.

The screening cavity is internally provided with a sorting cylinder communicated with the screening cylinder, the two ends of the sorting cylinder are open, two end covers are rotatably arranged at the two ends of the sorting cylinder and used for sealing the open ends of the sorting cylinder, the two ends of the roller are respectively connected with the end covers, a plurality of barrier strips are arranged on the outer circumferential wall of the roller at intervals along the axial direction of the roller, a magnetic suction plate is arranged between every two adjacent barrier strips in a sliding manner, an arc-shaped hole for the magnetic suction plate to pass through is formed in any one end cover, the end part of the magnetic suction plate movably penetrates through the arc-shaped hole and then extends outwards, a baffle plate is arranged at the extending end of the magnetic suction plate, the length of the baffle plate in the vertical direction is larger than that of the arc-shaped hole in the vertical direction, and a plurality of electromagnets are uniformly arranged on the surface of the magnetic suction plate; when the baffle plate works, the inner side wall of the baffle plate is in contact with the outer side wall of the end cover. Furthermore, in the technical scheme, part of small-size metal components, such as steel wires, screws or other metal embedded parts, generated by crushing can still be mixed in the formed aggregate, so that before the aggregate is screened, a sorting cylinder is arranged in a screening cavity, namely, metal objects mixed in the aggregate are removed before the aggregate moves to the multistage conveyor belt, and the damage of sharp corners of the metal objects to the conveying surface of the multistage conveyor belt is avoided; the specific working principle is as follows: the roller and the end covers are arranged at two ends of the sorting cylinder in a rotating mode, a plurality of magnetic suction plates can screen the aggregates passing through the outer wall of the roller while the roller rotates, namely, the metal objects in the aggregates are adsorbed, the discharging channel is opposite to the roller, the magnetic suction plates opposite to the discharging channel can directly adsorb the metal objects when the roller rotates, when the magnetic suction plates rotate to back to the discharging channel, the magnetic suction plates can be pulled out from the arc-shaped holes along the axis of the roller, until the magnetic suction plates are completely moved out of the sorting cylinder, the adsorption magnetic force on the magnetic suction plates is relieved, the adsorbed metal objects directly fall into the collecting frame, and then the magnetic suction plates move into the sorting cylinder again to complete continuous screening of the metal objects in the moving aggregates; wherein both ends of inhaling the board at magnetism are equipped with the baffle respectively, and two baffles are located a letter sorting section of thick bamboo one, another baffle then is located outside the letter sorting section of thick bamboo, when guaranteeing magnetism suction disc normal removal promptly, the removal displacement volume to magnetism suction disc limits, the axial along the roller is provided with a plurality of blend stops in its periphery wall interval simultaneously, and magnetism is inhaled the arc that the board itself is matchd with the roller outer wall, form a frame region on magnetism suction disc promptly, make things convenient for the collection of electro-magnet on the magnetism suction disc to the metallics, the blend stop can be stirred the removal aggregate, in order to avoid appearing the metallics of omitting.

The end cover is provided with a plurality of cylinders, the axis of the output end of each cylinder is parallel to the axis of the sorting cylinder, and the output end of each cylinder is connected with the baffle through a connecting rod. Further, the air cylinder arranged on the end cover can ensure that the magnetic suction plate can simultaneously perform linear motion along with the rotation of the roller, so that the magnetic suction plate can reset again after being moved out to release the metal objects, and the uninterrupted screening of the metal objects is ensured. It should be noted that the electromagnets are electrically connected with the air cylinder through the controller, that is, when the output end of the air cylinder moves to the maximum displacement, that is, one end part of the magnetic suction plate located at the inner side is contacted with the inner wall of the sorting cylinder, the electromagnets are powered off; when the output end of the air cylinder begins to retract, the electromagnet is restarted.

Still include secondary conveyor, secondary conveyor is located the discharge gate below. Further, the secondary conveyor belt is located below the discharge port and can transport the aggregates which are subjected to screening and dedusting procedures.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. blast pipe in two exhaust cavities in this scheme forms two air curtains in a screening section of thick bamboo, shift to the aggregate of a screening section of thick bamboo in by the pan feeding mouth and can directly skim two air curtains, and the dust that mix with in the fashioned aggregate and the minimum granule of size can enter into to the breathing tube through the bleeder vent, then concentrate by the blast pipe and arrange outside to the screening section of thick bamboo, collect the processing by current dust collecting equipment such as dust absorption sack is unified at last, discharge to discharge gate department by the bin outlet of a screening section of thick bamboo finally, conveniently pile up or transport, can not have the dust in final fashioned aggregate promptly, avoid causing dust pollution in follow-up multistage conveying or transportation.

2. This scheme sets into bad arcuation with the exhaust cavity, and the central angle that the circular arc that the exhaust cavity belongs to corresponds 60~90, in the shared space of feed inlet and the bin outlet of detaching the screening section of thick bamboo, the air current of spraying in the blast pipe can be completely with removing the aggregate cover to the screening section of thick bamboo in by the pan feeding mouth, and then improves the screening efficiency to the dust.

3. This scheme is through setting up a plurality of air current injection structures in a screening section of thick bamboo, the spun air current can be screened the aggregate through a screening section of thick bamboo, and this air current can not influence the normal removal of the aggregate that the size meets the requirements, the aggregate after being screened then directly discharges through row's material, and a plurality of breathing pipes in the suction cavity then can carry out the pump drainage to the air current that the blast pipe sprayed and the dust that mix with in the aggregate, the amount of wind of avoiding gathering in a screening section of thick bamboo is too big and cause the air current excessive.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a screening chamber configuration;

FIG. 3 is a schematic structural view of an end cap;

FIG. 4 is a longitudinal cross-sectional view of the exhaust pipe;

FIG. 5 is a distribution diagram of gas injection holes on a plurality of exhaust pipes;

FIG. 6 is a schematic structural view of a sieving drum;

FIG. 7 is a schematic structural view of a sorting cylinder;

fig. 8 is an enlarged view of a portion a in fig. 4.

Reference numbers and corresponding part names in the drawings:

1-frame, 2-primary conveyor belt, 3-conveying gear set, 4-driving motor, 5-feeding port, 6-screening cavity, 7-discharging port, 8-secondary conveyor belt, 9-main motor, 10-operation frame, 11-through hole, 12-ball head, 13 air injection hole, 14-rubber hose, 15-baffle, 16-feeding channel, 17-sorting cylinder, 18-magnetic suction plate, 19-baffle strip, 20-discharging channel, 21-screening cylinder, 22-discharging cavity, 23-discharging pipe, 24-discharging port, 25-screen, 26-air suction cavity, 27-air suction pipe, 28-filter screen, 29-screening roller, 30-roller, 31-chute, 32-slide block, 33-end cover, 34-cylinder, 35-connecting rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1:

as shown in fig. 1 to 8, the present embodiment includes a frame 1, a primary conveyor belt 2 and a screening chamber 6 are sequentially disposed on the frame 1, a feeding port 5 and a discharging port 7 are respectively disposed at two ends of the screening chamber 6, a discharging end of the primary conveyor belt 2 corresponds to the feeding port 5 of the screening chamber 6, a screening cylinder 21 is disposed in the screening chamber 6, a feeding port of the screening cylinder 21 is communicated with the feeding port 5, and a discharging port 24 of the screening cylinder 21 is communicated with the discharging port 7; the screening cylinder 21 is rotatably provided with a screening roller 29, an air suction cavity 26 is formed in the screening roller 29 along the circumferential direction of the screening roller, air suction pipes 27 with axes parallel to the axes of the screening roller 29 are sequentially arranged in the air suction cavity 26, a plurality of shifting forks are uniformly arranged on the circumferential wall of the screening roller 29 along the radial direction, air holes communicated with the annular air suction cavities 26 are formed between every two adjacent shifting forks, two arc-shaped exhaust cavities 22 with open end faces are arranged on the inner wall of the screening cylinder 21, the two exhaust cavities 22 are symmetrically distributed along the axes of the screening roller 29, a discharge port 24 is formed between the two exhaust cavities 22, the open ends of the exhaust cavities 22 are completely sealed through a filter screen 28, and a plurality of exhaust pipes 23 are arranged in each exhaust cavity 22.

When the device is used, the molded aggregate enters the feeding port 5 through the primary conveyor belt 2 and then enters the sieving cylinder through the feeding port, the exhaust pipe 23, the air suction pipe 27 and the exhaust fan connected with the exhaust pipe 23 in the sieving cylinder are all started, namely, the exhaust pipe 23 starts to exhaust high-speed gas in the sieving cylinder, the exhausted gas forms a plurality of air flows which are directly sprayed to the outer wall of the sieving roller 29, the air suction pipes 27 on the sieving roller 29 start to suck the gas exhausted from the exhaust pipe 23, at this time, the exhaust pipes 23 in the two exhaust cavities 22 form two air curtains in the sieving cylinder 21, the aggregate transferred to the sieving cylinder 21 from the feeding port 5 directly sweeps over the two air curtains, the dust and particles with extremely small sizes in the molded aggregate enter the air suction pipe 27 through the air holes and then are intensively exhausted outside the sieving cylinder 21 through the exhaust pipes 23, finally, the aggregate is collected and processed by existing dust collection equipment such as a dust collection cloth bag in a unified mode, and is finally discharged to a discharge port 7 through a discharge port 24 of a screening cylinder 21, so that the aggregate is convenient to stack or transport, namely dust cannot exist in the finally-formed aggregate, and dust pollution in the subsequent multi-stage conveying or transportation process is avoided.

Wherein, as the aggregates moving from the feeding port 5 to the sieving cylinder 21 mainly pass through the lower area of the sieving roller 29 during the moving process, the exhaust amount of the exhaust pipe 23 under the sieving roller 29 can be increased during the actual construction to realize the strong blowing of the moving aggregates in the large flow area, and ensure that the dust in the partial area can be absorbed by the air suction pipe 27, and a plurality of shifting forks are arranged on the outer wall of the sieving roller 29, and can not only stir the aggregates, so that the dust included in the aggregates can be fully released, but also because the shifting forks protrude out of the surface of the sieving roller 29, the area formed between two adjacent shifting forks on the upper part of the sieving roller 29 can temporarily store a part of the aggregates with smaller size, and the part of the aggregates can be quickly pushed into the air suction pipe 27 by the air flow formed by the corresponding exhaust pipe 23 and air suction pipe 27, and it should be noted that the part of the aggregate chips can be introduced into the air suction pipe 27 through the air holes. The outer circumferential wall of the air suction pipe 27 is provided with a plurality of small holes for sucking the dust in the air suction chamber 26. The air output of the exhaust pipe 23 and the pumping and discharging amount of the air suction pipe 27 can be adjusted, and the pumping and discharging function of the air suction pipe 27 continues to work, the gravity of aggregate meeting the standard in the sieving cylinder and the power generated by the rotation of the supporting cylinder can sufficiently offset the impact force generated when the air is released from the exhaust pipe 23, and the dust mixed in the aggregate can smoothly enter the air suction pipe 27 due to the small volume and weight, so that no dust is discharged from the discharge opening 24 of the sieving cylinder 21, and the caliber of the discharge opening 24 is small relative to the size of the feed opening 5 or the discharge opening 7 in actual use, and the external air is less influenced by the air suction pipe 27.

This embodiment is equipped with handling frame 10 in frame 1 side, and operating personnel accessible handling frame 10 carries out equipment and patrols and examines, and wherein elementary conveyer belt 2 drives conveying gear set 3 through driving motor 4 and carries out the elementary conveying of aggregate to can set up the cover body when in actual use on frame 1, it is airtight with the transfer path of elementary conveyer belt 2 to make things convenient for, and secondary conveyor 8 is located discharge gate 7 below, can transport the aggregate that has accomplished screening, dust removal process.

Example 2:

as shown in fig. 1 to 8, in this embodiment, on the basis of embodiment 1, a plurality of exhaust pipes 23 are equidistantly and alternately distributed in an exhaust cavity 22, a side wall of each exhaust pipe 23, which faces a sifting roller 29, is provided with a plurality of air injection holes 13, the plurality of air injection holes 13 on two adjacent exhaust pipes 23 are distributed in a staggered manner, and the distance between each air injection hole 13 and the outer circumferential wall of the sifting roller 29 is the same; be equipped with a plurality of blast pipes 23 in the exhaust cavity 22, the air current of spraying in the blast pipe 23 can be sieved the dust that mix with in the aggregate when removing, make the dust can follow the bleeder vent and enter into to breathing pipe 27 in, and the level of screening section of thick bamboo 21 is lower, set exhaust cavity 22 into the minor arc shape, and the central angle that exhaust cavity 22 place circular arc corresponds 60~90, in the shared space of feed inlet and bin outlet 24 of detaching screening section of thick bamboo 21, the air current of spraying in the blast pipe 23 can be completely with removing the aggregate cover to in the screening section of thick bamboo in by pan feeding mouth 5, and then improve the screening efficiency to the dust.

And in order to prevent the dust in the air suction cavity 26 from accumulating and being unable to be discharged outside through the air suction pipe 27 in time, the screen 25 is arranged in the air suction cavity 26, and the aperture of the filter holes on the screen 28 is smaller than that of the air holes, so that the fine aggregates attached to the outer wall of the screening roller 29 can be screened and separated again, and the air suction pipe 27 is prevented from being blocked. The blast pipe 23 is as the important part of screening dust, and its air current that erupts has direct influence to the screening effect, consequently, for the maximize that realizes the screening effect, be located same exhaust cavity 22 a plurality of blast pipes 23 equidistance interval distribution promptly, and be located a plurality of fumaroles 13 staggered distribution on two adjacent blast pipes 23, a plurality of air currents that form a plurality of evenly distributed's air current on screening roller 29 outer wall behind filter screen 28, a great deal of air current can cover the aggregate through screening roller 29 completely.

In the embodiment, another optimization scheme of the exhaust pipe 23 is provided, namely, a ball head 12 is rotatably arranged in the air injection hole 13, a through hole 11 is formed in one end of the ball head 12, a rubber hose 14 is arranged at the other end of the ball head 12, the rubber hose 14 is opposite to the outer wall of the screening roller 29, and the inner diameter of the through hole 11 decreases from inside to outside along the radial direction of the exhaust pipe 23. The moving track of the aggregates in the screening drum 21 is disordered and irregular, so that compared with the linear airflow jetted by the exhaust pipe 23, the disordered airflow acting on the moving aggregates can improve the screening efficiency of the dust mixed in the aggregates, for this, in this embodiment, a ball head 12 is rotatably disposed in the air injection hole 13, a through hole 11 is formed in the middle of the ball head 12, and a rubber hose 14 is arranged at the outer end of the bulb 12, the gas in the exhaust pipe 23 enters the rubber hose 14 after passing through the through hole 11, because the rubber hose 14 has strong deformation capacity and the through hole 11 with the inner diameter decreasing from inside to outside can accelerate the gas due to the change of the flow cross section, i.e. the rubber hose 14 can oscillate nondirectionally in a short time while the gas flows through, so that the gas flow passing through the sieve 28 is continuously redirected, carry out unordered impact to the aggregate that removes, and then improve the screening efficiency to the dust that is mingled with in the aggregate.

Example 3:

as shown in fig. 1 to 8, in this embodiment, on the basis of embodiment 1, a sorting cylinder 17 communicated with a sieving cylinder 21 is arranged in the sieving chamber 6, two ends of the sorting cylinder 17 are open, two end caps 33 are rotatably arranged at two ends of the sorting cylinder 17 and used for closing the open ends thereof, two ends of the roller 30 are respectively connected with the end caps 33, a plurality of barrier strips 19 are arranged on the outer circumferential wall of the roller 30 at intervals along the axial direction thereof, a magnetic attraction plate 18 is arranged between two adjacent barrier strips 19 in a sliding way, an arc-shaped hole for the magnetic attraction plate 18 to pass through is arranged on any end cover 33, the end part of the magnetic attraction plate 18 movably penetrates through the arc-shaped hole and then extends outwards, a baffle plate 15 is arranged at the extending end of the magnetic suction plate 18, the length of the baffle plate 15 in the vertical direction is larger than that of the arc-shaped hole in the vertical direction, and a plurality of sucker electromagnets are uniformly arranged on the surface of the magnetic suction plate 18; in operation, the inner side wall of the baffle 15 is in contact with the outer side wall of the end cap 33.

In this embodiment, the sorting cylinder 17 is provided with a feeding channel 16 and a discharging channel 20, the feeding channel 16 is communicated with the feeding port 5, the discharging channel 20 is communicated with the feeding port of the sieving cylinder 21, and the sorting cylinder 17 can sieve out metal objects mixed in the aggregate before the aggregate moves to the multi-stage conveyor belt, so as to avoid damage to the conveying surface of the multi-stage conveyor belt caused by sharp corners of the metal objects; the specific working principle is as follows: the roller 30 and the end covers 33 are rotatably arranged at two ends of the sorting cylinder 17, the magnetic suction plates 18 can sieve the aggregates passing through the outer wall of the roller 30 while the roller 30 rotates, namely, the metal objects in the aggregates are adsorbed, and because the discharge channel 16 is over against the roller 30, the magnetic suction plates 18 over against the discharge channel 16 can directly adsorb the metal objects when the roller 30 rotates, when the magnetic suction plates 18 rotate to back against the discharge channel 16, the magnetic suction plates 18 can be pulled out from the arc-shaped holes along the axis of the roller 30 until the magnetic suction plates 18 are completely moved out of the sorting cylinder 17, the adsorption magnetic force on the magnetic suction plates 18 is released, the adsorbed metal objects directly fall into the collecting frame, and then the magnetic suction plates 18 are moved into the sorting cylinder 17 again to complete continuous screening of the metal objects in the moving aggregates; wherein both ends at board 18 are inhaled to magnetism are equipped with baffle 15 respectively, and one in two baffle 15 is located a letter sorting section of thick bamboo 17, another baffle 15 then is located outside a letter sorting section of thick bamboo 17, when guaranteeing magnetism and inhale board 18 normal removal promptly, the removal displacement volume of inhaling board 18 to magnetism limits, axial along roller 30 is provided with a plurality of blend stops 19 on its outer circumferential wall interval simultaneously, and magnetism inhale board 18 itself and be the arc that matches with roller 30 outer wall, form a frame region on board 18 is inhaled to magnetism promptly, make things convenient for the collection of electro-magnet on the magnetism inhale board 18 to the metal object, blend stop 19 can stir the removal aggregate, in order to avoid appearing the metal object of omission.

It should be further noted that, when the magnetic attraction plate 18 that has completed the metal part adsorption rotates to the position back to the discharging channel 16, the magnetic attraction plate 18 starts to be drawn to move outward, the moving aggregate cannot directly contact with the outer wall of the roller 30, and the magnetic attraction plate 18 can complete the reset before moving to the position right opposite to the discharging channel 16, that is, the aggregate in the sorting cylinder 17 does not interfere with the movement of the magnetic attraction plate 18 between the two bars 19, and the linear movement of the end of the magnetic attraction plate 18 in the sorting cylinder 17 is obstructed.

In the embodiment, a plurality of air cylinders 34 are further arranged on the end cover 33, the axis of the output end of each air cylinder 34 is parallel to the axis of the sorting cylinder 17, and the output end of each air cylinder 34 is connected with the baffle 15 through a connecting rod 35. The air cylinder 34 arranged on the end cover 33 can ensure that the magnetic suction plate 18 can simultaneously perform linear motion along with the rotation of the roller 30, so that the magnetic suction plate 18 can reset after being moved out to release metal objects, and uninterrupted screening of the metal objects is ensured. It should be noted that the plurality of electromagnets are electrically connected to the air cylinder 34 through the controller, that is, when the output end of the air cylinder 34 moves to its maximum displacement, that is, when one end of the magnetic attraction plate 18 located at the inner side contacts the inner wall of the sorting cylinder 17, the electromagnets are powered off; when the output of the cylinder 34 begins to retract, the solenoid is reactivated.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a building recovery aggregate screening plant, includes frame (1), is equipped with elementary conveyer belt (2) and screening cavity (6) in proper order in frame (1), and the both ends of screening cavity (6) are equipped with pan feeding mouth (5) and discharge gate (7) respectively, and the discharge end of elementary conveyer belt (2) corresponds its characterized in that with pan feeding mouth (5) of screening cavity (6): a screening cylinder (21) is arranged in the screening cavity (6), a feed inlet of the screening cylinder (21) is communicated with the feed inlet (5), and a discharge outlet (24) of the screening cylinder (21) is communicated with the discharge outlet (7); a screening roller (29) is rotatably arranged in the screening cylinder (21), an air suction cavity (26) is arranged in the screening roller (29) along the circumferential direction of the screening roller, a plurality of air suction pipes (27) with the axes parallel to the axes of the screening roller (29) are sequentially arranged in the air suction cavity (26), a plurality of shifting forks are uniformly arranged on the outer circumferential wall of the screening roller (29) along the radial direction, and air holes communicated with the annular air suction cavity (26) are formed between two adjacent shifting forks, two arc-shaped exhaust cavities (22) with open end surfaces are arranged on the inner wall of the screening cylinder (21), the two exhaust cavities (22) are symmetrically distributed along the axis of the screening roller (29), a discharge opening (24) is arranged between the two exhaust cavities (22), and the open end of the exhaust cavity (22) is completely closed by a filter screen (28), a plurality of exhaust pipes (23) are arranged in each exhaust cavity (22); when aggregate dust removal screening is carried out, aggregate in the screening cylinder (21) is screened by air flow jetted from the exhaust pipe (23), and dust mixed in the aggregate is adsorbed into the air suction pipe (27) after passing through the air holes.

2. The building recycled aggregate screening device of claim 1, wherein: the exhaust cavity (22) is in a minor arc shape, and the central angle corresponding to the arc where the exhaust cavity (22) is located is 60-90 degrees.

3. The building recycled aggregate screening device of claim 1, wherein: follow the circumference of inhaling air cavity (26) is equipped with screen cloth (25) that matches with it on its inner wall, and screen cloth (25) will bleeder vent and inhaling the inside separation of air cavity (26), and the filtration pore aperture on filter screen (28) is less than the aperture of bleeder vent.

4. The building recycled aggregate screening device of claim 1, wherein: it is a plurality of blast pipe (23) equidistance interval distribution in exhaust cavity (22) each blast pipe (23) just all opened a plurality of fumaroles (13) on the lateral wall of screening roller (29), and a plurality of fumaroles (13) staggered distribution on two adjacent blast pipes (23), each fumarole (13) are the same with the interval of screening roller (29) outer circumferential wall.

5. The building recycled aggregate screening device of claim 4, wherein: the inner diameter of the through hole (11) is gradually decreased from inside to outside along the radial direction of the exhaust pipe (23).

6. The construction recycled aggregate screening device as claimed in any one of claims 1 to 5, wherein: a sorting cylinder (17) communicated with the screening cylinder (21) is arranged in the screening cavity, two ends of the sorting cylinder (17) are open, two end covers (33) are rotatably arranged at two ends of the sorting cylinder (17) and used for sealing the open ends of the sorting cylinder, two ends of the roller (30) are respectively connected with the end covers (33), a plurality of barrier strips (19) are arranged on the outer circumferential wall of the roller (30) at intervals along the axial direction of the roller, a magnetic suction plate (18) is arranged between two adjacent barrier strips (19) in a sliding way, an arc-shaped hole for the magnetic suction plate (18) to pass through is arranged on any end cover (33), the end part of the magnetic suction plate (18) movably penetrates through the arc-shaped hole and then extends outwards, a baffle (15) is arranged at the extending end of the magnetic suction plate (18), the length of the baffle (15) in the vertical direction is greater than that of the arc-shaped hole in the vertical direction, and a plurality of suction cup electromagnets are uniformly arranged on the surface of the magnetic suction plate (18); in operation, the inner side wall of the baffle (15) is contacted with the outer side wall of the end cover (33).

7. The building recycled aggregate screening device of claim 6, wherein: the end cover (33) is provided with a plurality of air cylinders (34), the axis of the output end of each air cylinder (34) is parallel to the axis of the sorting cylinder (17), and the output end of each air cylinder (34) is connected with the baffle (15) through a connecting rod (35).

8. The building recycled aggregate screening device of claim 6, wherein: still include secondary conveyor (8), secondary conveyor (8) are located discharge gate (7) below.