CN112354852B

CN112354852B - Sieving device and concrete aggregate grading separation blanking device

Info

Publication number: CN112354852B
Application number: CN202011182625.6A
Authority: CN
Inventors: 曾维西
Original assignee: Beijing Shoutie General Construction Environmental Protection Engineering Co ltd
Current assignee: Beijing Shoutie General Construction Environmental Protection Engineering Co.,Ltd.
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2022-02-25
Anticipated expiration: 2040-10-29
Also published as: CN112354852A

Abstract

The invention discloses a sieving device.A lifting mechanism is used for driving a screen to move up and down in a limiting cavity formed by enclosing a turnover plate and a side baffle; the first material falling from the meshes of the screen can move downwards along the guide of the first guide plate and the second guide plate until falling from the top of the tail end of the second guide plate; the rotating handheld rod can drive the sliding plate to move towards the position direction of the turnover plate, the turnover plate turns downwards, and the second guide plate moves back to the first guide plate until the blanking through hole is exposed synchronously; so that the second material in the screen mesh synchronously moves towards the position direction of the turnover plate until part of the second material can fall into the blanking through hole from the side opening between the turnover plate and the side baffle plate, and the other part of the second material can fall from the inclined turnover plate from top to bottom. The invention also discloses a concrete aggregate grading separation blanking device. The invention has the advantages of fully screening materials, and conveniently realizing the unloading of residual materials in the screen and the sieved materials at different specified positions.

Description

Sieving device and concrete aggregate grading separation blanking device

Technical Field

The invention relates to the technical field of building engineering material processing, in particular to a sieving device and a concrete aggregate grading separation blanking device.

Background

The material screening is to put the material to be screened into a screen mesh, and realize the separation of a first material with a smaller particle size and a second material with a larger particle size under the filtration of mesh holes of a brush net.

The objects of the material screening can be automobile interior trim part particles, automobile sealing strip particles, sand stones, fertilizer raw materials, crops, coatings, construction wastes, coal mines and the like, so the material screening technology is widely applied to various industries such as chemical industry, construction, machinery, agriculture and the like.

In the material screening device in the prior art, as disclosed in patent application 201320537002.5, a power mechanism provides power to drive a screen frame to swing left and right, so that a screen does left and right swing motion, and powder smaller than meshes and falling on the screen falls on a charging car to realize automatic screening; or, as disclosed in patent application 201711473746.4, the screening method for processing sweet potato powder drives the screen to move by the work of the vibration motor, so as to screen the sweet potato powder, and the sweet potato powder with smaller particle size falls down from the meshes of the screen.

According to the prior art, at present, after the materials are screened, the materials with smaller particle sizes can be input to the next procedure for continuous processing through the filtration of meshes, however, the materials with larger particle sizes usually remain in the screen and need to be unloaded by workers subsequently, or the materials in the screen are carried and removed manually or the screen is disassembled and then poured out; therefore, in any of the above-mentioned methods, there is a technical problem that the discharging is troublesome. And adopt the drum-type device that sieves, like the building rubbish screening cylinder that patent application 201810428627.5 disclosed, the domestic waste drum screening machine that patent application 201410246742.2 disclosed utilizes the cylinder of slope structure as the screen cloth, and after the higher one end feeding in position in the cylinder was followed to the material, the material divides the sieve under the circumstances of downward flow, wherein, the material that the particle size is great falls out the lower one end in position in the cylinder, and the less material of particle size passes through the mesh and falls in the below of cylinder, realizes the separation of the great material of particle size, the less material of particle size to different regions. However, in the technical scheme, the material anisotropic separation of different grain size grades is based on that the materials are in a flowing state all the time in the sieving process, so that the sieving time of the materials can be greatly shortened, the sieving is insufficient, and the technical problems of serious rework situation exist.

Disclosure of Invention

The technical problem to be solved by the invention is that on the basis of ensuring the sufficient screening of the materials, the unloading of the residual materials in the screen and the screened materials at different designated positions can be conveniently realized, so that the anisotropic separation of the materials with different particle size grades is realized, and the continuity of the subsequent processing is improved.

The invention solves the technical problems through the following technical means: a sieving device comprises a handheld rod, a screen, a turnover plate, a side baffle, a lifting mechanism, a first guide plate, a second guide plate, a blanking channel and an extension mechanism;

the side baffle comprises two side plates and a sliding plate which are oppositely arranged, and the two side plates and the sliding plate can form a structure with three closed sides, one open side and up-down conduction; the turnover plate is in rotating fit with the opening side of the side baffle plate, and the first elastic piece is assembled to enable the turnover plate to cover the opening side of the side baffle plate; the stretching mechanism can stretch out to move to drive the sliding plate to slide towards the position direction of the turnover plate; one side of the screen is attached to the inner wall of the turnover plate, and the other three sides of the screen are respectively attached to the inner walls of three mutually closed sides of the side baffle plates; the lifting mechanism is used for driving the screen to move up and down in a limiting cavity formed by the turnover plate and the side baffle;

the first guide plate and the second guide plate are positioned below the screen, and the first guide plate and the second guide plate are in head-to-tail contact to form a transition from the top of the starting end of the first guide plate to the top of the tail end of the second guide plate in a mode of gradually linearly reducing the height; the blanking channel is positioned below the second guide plate, and when the first guide plate is in head-to-tail contact with the second guide plate, the projections of the first guide plate and the second guide plate in the vertical direction completely cover the projection of the blanking through hole in the blanking channel in the vertical direction; the first material falling from the meshes of the screen can move downwards along the guide of the first guide plate and the second guide plate until falling from the top of the tail end of the second guide plate;

the handheld rod is rotated to drive the sliding plate to move towards the position direction of the turnover plate, the turnover plate turns downwards, and the second guide plate moves back to the first guide plate until the blanking through hole is exposed synchronously; and the second material in the screen is synchronously moved towards the position direction of the turnover plate until one part of the second material in the screen can fall into the blanking through hole from the side opening between the turnover plate and the side baffle plate, and the other part of the second material in the screen can fall from the inclined turnover plate from top to bottom.

Preferably, a connecting plate and a second elastic member are arranged on the side baffle plate, and the second elastic member is connected between the sliding plate and the connecting plate.

Preferably, the two groups of meshes are respectively distributed on two sides of the bottom of the screen, an upward-raised material guiding structure is formed on the upper surface of the middle area of the bottom of the screen, and the side surface of the material guiding structure is a slope; the first guide plate, the second guide plate and the blanking channel are arranged on two sides below the screen.

Preferably, the device also comprises a first connecting rod, a second connecting rod, a lifting rack, a first gear, a rotating wheel and a third connecting rod; the upper end of the first connecting rod is hinged to the turnover plate, the lower end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the second connecting rod and the rotating wheel are coaxially connected with the first gear, the lifting rack is meshed with the first gear, and the two ends of the third connecting rod are eccentrically hinged to the first gear and the second guide plate respectively.

Preferably, the lifting device further comprises a second gear, the second gear is meshed with the lifting rack, and the handheld rod is coaxially connected with the second gear.

Preferably, elevating system includes cam, cam pivot, driving motor, cam pivot normal running fit sets up the below of screen cloth, the cam with cam pivot is connected, and with the bottom contact of screen cloth, driving motor is used for the drive the cam rotates.

Preferably, the extension mechanism comprises a wheel disc, a push rod, a movable rod, an extension rod and a guide sleeve, wherein the push rod is eccentrically hinged with the wheel disc, a linear through groove is formed in the movable rod, the push rod extends into the linear through groove, one end of the extension rod is connected with the movable rod, the other end of the extension rod is in sliding fit with the guide sleeve, and the wheel disc is rotated to enable the extension rod to move in a reciprocating manner along the guide sleeve.

Preferably, the hand-held rod further comprises a driving bevel gear, a driven bevel gear and a transmission device, wherein the driving bevel gear is linked with the hand-held rod through the transmission device, and the driven bevel gear is coaxially connected with the wheel disc and meshed with the driving bevel gear.

Preferably, a fixed block and a vertical shaft are fixed on the frame, the vertical shaft is matched with the limit block in a sliding manner, and the limit block is moved downwards so that the bottom of the limit block can be contacted with the top of the fixed block; the third elastic piece is arranged between the handheld rod and the rack and assembled to enable the handheld rod to be inclined and the turnover plate to rotate to be inclined downwards; when the handheld rod is vertical, the turnover plate covers the opening side of the side baffle, and the handheld rod can be pressed against the side face of the limiting block supported on the fixed block; the limiting block is moved upwards until the handheld rod is separated, and the third elastic piece can drive the handheld rod to reset to an inclined state.

The invention also discloses a concrete aggregate grading separation blanking device, wherein a first guide channel and a second guide channel are respectively arranged on the first guide plate and the second guide plate, the first guide channel comprises a first guide baffle and a second guide baffle, the first guide baffle and the second guide baffle are respectively positioned on two sides of the top of the first guide plate, the guide directions of the first guide baffle and the second guide baffle are consistent with the inclination direction of the first guide plate, the second guide channel comprises a bent plate, the bent plate is arranged on one side of the top of the second guide plate, when the first guide plate is in head-tail contact with the second guide plate, the starting end of the bent plate can be in contact with the tail end of the second guide baffle, and the tail end of the bent plate is bent downwards to the other side of the top of the second guide plate; a guide channel is arranged on one surface of the turnover plate, which is opposite to the sliding plate; when the turnover plate is inclined downwards, the guide and falling channel is close to the tail end of the turnover plate and forms a splayed structure with a wider end far away from the tail end of the turnover plate and a narrower end close to the tail end of the turnover plate; coarse aggregate can fall from first direction passageway, second direction passageway, and fine aggregate can fall from leading the passageway that falls.

The invention has the advantages that: (1) by adopting the sieving device, when the sieving is needed, the turnover plate can be turned over and covered on the opening side of the side baffle plate, the sliding plate is closed on the two side plates, so that a box body structure with an opening at the top and meshes at the bottom is formed between the sliding plate, the two side plates, the sieve and the turnover plate; the separation and fixed-point transportation of the first material with smaller particle size are realized; (2) when the second material in the screen needs to be cleaned and discharged, the rotating hand-held rod can drive the sliding plate to move towards the position direction of the turnover plate, the turnover plate turns downwards, the second guide plate moves back to the first guide plate until the discharging through hole is exposed synchronously, so that under the pushing action of the sliding plate, a part of the second material in the screen falls into a second set position range through an opening between the side edge of the turnover plate and the side edge of the side baffle plate, the other part of the second material falls into the second set position range from top to bottom along the inclined turnover plate, the separation and fixed-point transportation of the second material with larger particle size are realized, the unloading of the residual material in the screen and the sieved material at different specified positions is conveniently realized on the basis of ensuring the sufficient screening of the material, and the different-direction separation of the materials with different particle size grades is realized, the technical effect of improving the continuity of subsequent processing is achieved; (3) the structure of the invention realizes the technical effects that different stages of material feeding in different directions after screening are technically independent and the device has high integration level on the whole. Because the rotating handheld rod can drive the sliding plate to move towards the position direction of the turnover plate, the turnover plate turns downwards, and the second guide plate moves back to the first guide plate until the blanking through hole is exposed synchronously, on one hand, the online operation of workers is facilitated, in the practical operation, the linkage of the sliding plate, the turnover plate and the second guide plate can be realized only by rotating the handheld rod, the deformation of the device is carried out, the mechanical cooperation synergy is high, and the working requirements of the sieving stage and the unloading of residual materials (second materials) in the screen mesh can be accurately met; on the other hand, the handheld rod is used as active drive, so that the mounting position of the handheld rod can be separated from the working element, and the relative interference between workers and the working element is weakened; (4) the structural design of relative movement among the screen, the turnover plate and the side baffle plate is a necessary structure for solving the technical problem, the structure reasonably matches the requirements of screening and grading anisotropic blanking, the device is strong in integration, and the linking and matching degree of the two working stages is high; the first guide plate and the second guide plate are in head-to-tail contact, and the structural design that the top of the starting end of the first guide plate is transited to the top of the tail end of the second guide plate in a mode that the height is gradually and linearly reduced is formed, so that the first material filtered from the through hole of the screen can freely fall into a first preset position range which is specified in advance under the action of the formed inclined guide from top to bottom, and the projection of the first guide plate and the second guide plate in the vertical direction completely covers the projection of the blanking through hole in the blanking channel in the vertical direction, the blanking through hole is hidden, and the first material is prevented from falling into the blanking through hole and being mixed into the second preset position range; (5) at the initial stage of pushing the sliding plate, the turnover plate is not formed into a downward inclined structure, an opening is formed between the side edge of the turnover plate and the side edge of the side baffle plate at the moment, because at the moment, the second guide plate can move back to back relative to the first guide plate until the blanking through hole is exposed, and the second guide plate at the moment is moved to a far position, the second material falling from the opening between the side edge and the side edge of the side baffle plate can fall into the blanking through hole, and therefore the second material of the part is prevented from falling into the second guide plate and being mixed into the range of the first set position.

Furthermore, a sealing layer is arranged on the side face of the screen, and the sealing performance between the screen and the inner wall of the turnover plate and the inner walls of three sides of the side baffle plate, which are closed mutually, is improved through the sealing layer.

Further, when the first guide plate and the second guide plate are in end-to-end contact, the projection of the tail end of the screen in the vertical direction is intersected on the second guide plate or is superposed with the boundary line between the first guide plate and the second guide plate; when the returning face plate overturns downwards and is inclined, the second material falling from the opening between the side edge of the returning face plate and the side edge of the side baffle plate is further ensured to accurately fall into the discharging through hole.

Furthermore, as the first guide channel and the second guide channel are respectively arranged on the first guide plate and the second guide plate, the limitation of the motion track of the first material in the blanking process can be further ensured, and the first material can smoothly fall into a first set position range. The second guide channel comprises a bent plate, the tail end of the bent plate is bent downwards to the other side of the top of the second guide plate, the first material is guaranteed to fall from the side face or the position close to the side of the device through the reversing effect of the bent plate, the distance between the first material and a second material blanking area (a first set position range) is increased, and on the premise that the device integration and the low floor area are guaranteed, the phenomenon of crossed blanking between the first material and the second material can be further avoided. Because when the returning face plate downward sloping, lead the passageway and be close to the end of returning face plate and form the one end of keeping away from the end of returning face plate and be wider and the narrower splayed structure of the one end of the end that is close to the returning face plate for part second material that falls from the returning face plate can accurately fall into to the first settlement position within range under the guide effect of leading the passageway, avoids second material because of falling into on the second deflector and lead to the technical problem that material separation purity is low at the blanking in-process.

Furthermore, sealing strips are arranged on the edge of the turnover plate and the edge of the sliding plate. The relative tightness between the turnover plate and the side baffle plate as well as between the sliding plate and the side plate is increased through the sealing strips.

Furthermore, a friction strip made of rubber is arranged on the guide rail, so that the friction coefficient of the upper end of the lifting rack matched with the vertical guide rail is increased, and the stability of the lifting rack in a non-motion state is further ensured.

Furthermore, the connecting plate and the second elastic piece are arranged on the side baffle plate, and when the sliding plate is pushed to move towards the position direction of the turnover plate, the second elastic piece deforms, so that when the sliding plate is reset to move back to the position direction of the turnover plate, the resetting accuracy of the sliding plate is ensured by utilizing the resetting elastic force of the second elastic piece. When the extension bar is not connected with the sliding plate, the second elastic piece realizes the resetting of the sliding plate. The side plate is provided with a guide groove, and the end part of the sliding plate is in sliding fit with the guide groove.

Furthermore, the screen is shaken up and down by adopting a vertical shaking mode, namely a lifting mechanism is required to be arranged at the bottom of the screen, the lifting mechanism can occupy the mesh opening point positions of the screen, in order to reduce the influence of the lifting mechanism on the mesh opening point positions, the meshes are divided into two groups which are respectively distributed at two sides of the bottom of the screen, and the lower surface of the middle area of the bottom of the screen of the lifting mechanism is matched. Due to the structure, the middle area of the bottom of the screen is of a solid structure, and materials can be screened in time in order to meet the requirement. According to the invention, the guide structure which is upwards raised is formed on the upper surface of the middle area at the bottom of the screen, the side surface of the guide structure is a slope, and when the material is screened, the material can continuously move to meshes at two sides of the bottom of the screen under the inclined guide of the slope structure, so that the complete screening effect of the material is ensured.

Furthermore, the bottom of the screen is rotatably connected with a roller, the cam is in rolling contact with the driven roller, a circle of limiting groove is formed in the cam, and the roller is always limited in the limiting groove.

Furthermore, when the handheld rod is rotated to be vertical, the handheld rod can be pressed against the side face of the limiting block supported on the fixed block, so that the position stability of the handheld rod is further ensured, the position stability of the sliding plate, the turnover plate and the second guide plate which are linked with the handheld rod is further ensured, and the elements are prevented from moving in a staggered manner in the screening working process. When the second material in the screen is discharged, the reset of the handheld rod can be realized by moving the limiting block upwards, and the turnover plate, the second guide plate and the sliding plate are linked to move to discharge. The fastening mode of foretell handheld pole compares and offers first screw hole in the frame, offers the second screw hole on handheld pole, when handheld pole rotates to vertical, stretches into the mode that carries out the locking of handheld pole to first screw hole, second screw hole and through the artifical handheld pole of handing always of work through bolt screw-thread fit, is better in the aspect of the flexibility of operation.

Drawings

Fig. 1 is a schematic structural view of a turnover plate in a sieving device in a closed state.

Fig. 2 is a schematic side view of a closed turning plate of a sieving device according to the present invention.

Fig. 3a is a schematic structural view of a turning plate in a sieving device according to the present invention in a rotating state.

Fig. 3b is a schematic structural view of the turnover plate in a downward inclined state in the sieving device of the present invention.

Fig. 4a is a schematic structural view of a turnover plate in a sieving device in a front view under a downward inclined state.

FIG. 4b is a schematic view of the installation structure of the second material guiding plate according to the present invention.

Fig. 5 is a schematic front view of a closed turning plate of a sieving device according to the present invention.

Fig. 6 is a schematic view of a top view of a turnover plate in a downward-inclined state in a sieving device according to the present invention.

Fig. 7 is a schematic view of a side view from above of a turnover plate in a downward-inclined state in a sieving device according to the present invention.

Fig. 8 is a schematic front view of a sifting device of the present invention with a turnover plate tilted downward.

Fig. 9 is a structural schematic diagram of a sieving device according to the present invention at a back view.

Fig. 10 is a schematic structural diagram of a sieving device of the present invention in a state where a roller and a cam are engaged.

Fig. 11 is a schematic structural view of a sieving device according to the present invention in a state of unloading a second material.

Fig. 12 is a schematic structural view of a hand-held rod in a vertically fastened state in a sieving device according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Example 1

As shown in fig. 1 and 2, the present embodiment discloses a sieving device, which includes a hand-held rod 11, a screen 21, a turnover plate 22, a side baffle 3, a lifting mechanism 4, a first guide plate 51, a second guide plate 52, a blanking channel, and an extension mechanism 7.

The side baffle 3 comprises two side plates 31 and a sliding plate 32 which are oppositely arranged, and the two side plates 31 and the sliding plate 32 can form a structure with three closed sides and one open side and can be conducted up and down. As shown in fig. 3a and 3b, the turnover plate 22 is rotatably engaged with the opening side of the side guard 3, and the first elastic member 818 is assembled so that the turnover plate 22 covers the opening side of the side guard 3. The extending mechanism 7 extends to drive the sliding plate to slide towards the position of the turnover plate 22. One side of the screen 21 is abutted against the inner wall of the turning plate 22, and the other three sides of the screen 21 can be respectively abutted against the inner walls of the three sides of the side baffle 3 which are closed to each other. The lifting mechanism 4 is used for driving the screen 21 to move up and down in a limiting cavity formed by the turnover plate 22 and the side baffle 3; when the screen 21 moves to the lowest point, the top surface of the screen 21 is flush with the bottom surface of the slide plate 32.

The first guide plate 51 and the second guide plate 52 are located below the screen 21, and the first guide plate 51 and the second guide plate 52 are in head-to-tail contact to form a top portion that gradually linearly decreases in height from the top of the starting end of the first guide plate 51 to the end of the second guide plate 52. As shown in fig. 4, the blanking channel 61 is located below the second guide plate 52 and when the first guide plate 51 contacts the second guide plate 52 end to end, the projection of the first guide plate 51 and the second guide plate 52 in the vertical direction completely covers the projection of the blanking through hole 611 in the blanking channel 61 in the vertical direction. The first material falling from the meshes of the screen 21 can move downward along the guide of the first and

second guide plates

51 and 52 until falling from the top of the end of the second guide plate 52.

The rotation of the hand-held rod 11 can drive the sliding plate 32 to move towards the position direction of the turnover plate 22, the turnover plate 22 turns downwards, and the second guide plate 52 moves back to the first guide plate 51 until the blanking through hole 611 is exposed, so that the second material in the screen 21 synchronously moves towards the position direction of the turnover plate 22 until a part of the second material in the screen 21 can fall into the blanking through hole 611 from the side opening between the turnover plate 22 and the side baffle 3, and the other part of the second material in the screen 21 can fall from the downward-inclined turnover plate 22 to the top.

When the sieving device is used for sieving materials, the initial state is set as that the turnover plate 22 is closed on the opening side of the side baffle plate 3, the materials are input into the screen 21, the lifting mechanism 4 is started, the lifting mechanism 4 moves up and down to drive the screen 21 to move up and down in a limiting cavity formed by the turnover plate 22 and the side baffle plate 3 in a surrounding mode, the screen 21 shakes up and down in a reciprocating mode, the materials in the screen 21 are sieved under the action of shaking force, and first materials with smaller particle sizes fall through meshes and move down under the guiding action of the first guide plate 51 and the second guide plate 52 until the first materials fall into a first set position range from the top of the tail end of the second guide plate 52; when the screen 21 is adjusted to move to the lowest point by the elevating mechanism 4 after the screening is completed, the top surface of the screen 21 is flush with the bottom surface of the sliding plate 32 or the top surface of the screen 21 is slightly lower than the bottom surface of the sliding plate 32 to the extent that the second material in the screen 21 does not sufficiently pass through the gap between the top surface of the screen 21 and the bottom surface of the sliding plate 32. When the lifting mechanism 4 is closed, the hand-held lever 11 is rotated in the forward direction, and since the hand-held lever 11 is rotated to drive the sliding plate 32 to move towards the position direction of the turning plate 22, the turning plate 22 turns downwards, the second guide plate 52 moves back to the first guide plate 51 until the blanking through hole 611 is exposed, the sliding plate 32 moves towards the position direction of the turning plate 22 at the moment, and drives the second material on the screen 21 to move towards the position direction of the turning plate 22 synchronously, in the initial stage of the process of rotating the turnover plate 22, a part of the second material falls into the blanking through holes 611 through the openings between the side edges of the turnover plate 22 and the side edges of the side guards 3 under the pushing action of the sliding plate 32 until the second material falls into the second set position range, when the turnover plate 22 is turned downwards until the turnover plate 22 is inclined downwards, the other part of the second material falls down from the inclined turnover plate 22 to the second set position range from top to bottom under the pushing action of the sliding plate 32. After the sliding plate 32 pushes the second object and the material is discharged, the rotating hand-held rod 11 is reversely reset, the sliding plate 32 is reset, the turnover plate 22 is covered (closed) on the side opening of the side baffle 3 again under the reset action of the first elastic piece 818, the turnover plate 22 is reset to drive the second guide plate 52 to reset, the discharging through hole 611 is hidden below the first guide plate 51 and the second guide plate 52 again, and the classified material separation discharging is completed.

By adopting the sieving device of the invention, when the sieving is needed, the turnover plate 22 can be turned over and covered (closed) on the opening side of the side baffle 3, the sliding plate 32 is closed on the two side plates 31, so that a box body structure with an open top and a mesh at the bottom is formed among the sliding plate 32, the two side plates 31, the screen 21 and the turnover plate 22, because one side of the screen 21 is abutted against the inner wall of the turnover plate 22, the other three sides of the screen 21 are respectively abutted against the inner walls of the three sides of the side baffle plate 3 which are closed mutually, under the lifting action of the lifting mechanism 4, the screen 21 moves up and down in the limit cavity and has good sealing performance, the smooth shaking and sieving is ensured, the first material with smaller particle size after being screened moves downwards under the guidance of the first guide plate 51 and the second guide plate 52 until falling from the top of the tail end of the second guide plate 52 to a first set position range; the separation and fixed-point transportation of the first material with smaller particle size are realized; when the second material in the screen 21 needs to be cleaned and discharged, because the sliding plate 32 can be driven by rotating the handheld rod 11 to move towards the position direction of the turnover plate 22, the turnover plate 22 turns downwards, and the second guide plate 52 moves back to the first guide plate 51 until the discharging through hole 611 is exposed synchronously, under the pushing action of the sliding plate 32, a part of the second material in the screen 21 falls into the range of the second set position through the opening between the side edge of the turnover plate 22 and the side edge of the side baffle 3, and the other part of the second material falls into the range of the second set position from top to bottom along the inclined turnover plate 22, so that the separation and fixed-point transfer of the second material with larger particle size are realized, and on the basis of ensuring the sufficient material separation, the unloading of the second material remaining in the screen 21 and the first material after sieving at different designated positions can be conveniently realized, thereby realizing the anisotropic separation of materials with different particle size grades and improving the technical effect of the subsequent processing continuity; the structure of the invention realizes the technical effects that the material different-direction blanking of different grades (particle size grades) after screening is independent in process and the integration level of the device is high on the whole. Because the invention rotates the hand-held rod 11 and can drive the sliding plate 32 to move towards the position direction of the turnover plate 22, the turnover plate 22 turns downwards, the second guide plate 52 moves back to the first guide plate 51 until the blanking through hole 611 is exposed synchronously, on one hand, the invention is convenient for the online operation of the working personnel, during the actual operation, the linkage of the sliding plate 32, the turnover plate 22 and the second guide plate 52 can be realized only by rotating the hand-held rod 11, the deformation of the device is carried out, the mechanical cooperation synergy is high, and the working requirements of the sieving stage and the unloading of the residual material (second material) in the screen 21 can be accurately met; on the other hand, as the handheld rod 11 is used as active drive, the separation between the installation position of the handheld rod 11 and the working element can be realized, and the relative interference between workers and the working element is weakened; the structural design of relative movement among the screen 21, the turnover plate 22 and the side baffle 3 is a necessary structure for solving the technical problem, the structure reasonably matches the requirements of screening and material grading anisotropic blanking, the device is strong in integration, and the linking and matching degree of the two working stages is high; the structural design that the first guide plate 51 is in head-to-tail contact with the second guide plate 52, and the top of the first guide plate 51 is transited to the top of the tail end of the second guide plate 52 in a mode that the height is gradually and linearly reduced is formed, so that the first material filtered from the through hole of the screen 21 can freely fall into a first preset position range which is specified in advance by the formed structure in an inclined guide way from top to bottom, and the projection of the first guide plate 51 and the second guide plate 52 in the vertical direction completely covers the projection of the blanking through hole 611 in the blanking channel 61 in the vertical direction, so that the blanking through hole 611 is hidden, and the first material is prevented from falling into the blanking through hole 611 and being mixed into the second preset position range; at the initial stage of pushing the sliding plate 32, the turnover plate 22 is not formed into a downward inclined structure, and at this time, an opening is formed between the side edge of the turnover plate 22 and the side edge of the side shield 3 first, because at this time, the second guide plate 52 can move back to back relative to the first guide plate 51 until the blanking through hole 611 is exposed, and at this time, the second guide plate 52 is moved to a far position, the second material falling from the opening between the side edge of the turnover plate 22 and the side edge of the side shield 3 can fall into the blanking through hole 611 instead of the second guide plate 52, and thus, the second material of the part can be prevented from falling into the second guide plate 52 and mixing into the first set position range.

The screened material can be concrete aggregate which is screened and fed, and can also be automotive upholstery particles, automotive sealing strip particles, sand stones, fertilizer raw materials, crops, coatings, construction wastes and coal mines.

In some embodiments, a sealing layer is provided on the side of the screen 21, and the sealing layer increases the sealing performance between the inner wall of the turning plate 22 and the inner walls of the three sides of the side barrier 3 which are closed to each other.

Preferably, when the first guide plate 51 contacts the second guide plate 52 end to end, the projection of the end of the screen 21 in the vertical direction intersects the second guide plate 52 or coincides with the boundary line between the first guide plate 51 and the second guide plate 52; thus, the second material falling from the opening between the side edge of the turnover plate 22 and the side edge of the side baffle 3 is further ensured to accurately fall into the blanking through hole 611.

As shown in fig. 4 and 5, in some embodiments, a first guide channel and a second guide channel are respectively disposed on the first guide plate 51 and the second guide plate 52, the first guide channel includes a first guide barrier 5111 and a second guide barrier 5112, the first guide barrier 5111 and the second guide barrier 5112 are respectively disposed on two sides of the top of the first guide plate 51, and the guide directions of the first guide barrier and the second guide barrier coincide with the inclined direction of the first guide plate 51, the second guide channel includes a curved plate 5211, the curved plate 5211 is disposed on one side of the top of the second guide plate 52, when the first guide plate 51 and the second guide plate 52 are in head-to-tail contact, the starting end of the curved plate 5211 can contact with the end of the first guide barrier 5111, and the end of the curved plate 5211 is curved downward to the other side of the top of the second guide plate 52. A guide passage 221 is provided in the inversion plate 22 on the side opposite to the slide plate 32. When the flipping panel 22 is tilted downward, the drop guide channel 221 is close to the end of the flipping panel 22 and forms a splayed structure in which the end far from the end of the flipping panel 22 is wider and the end close to the end of the flipping panel 22 is narrower.

As shown in fig. 4, a third guide fence (not shown) is further disposed on the other side of the top of the second guide plate 52, the guide direction of the third guide fence is the same as the inclination direction of the second guide plate 52, and when the first guide plate 51 contacts the second guide plate 52 end to end, the start end of the third guide fence contacts the end of the second guide fence 5112.

Because the first guide channel and the second guide channel are respectively arranged on the first guide plate 51 and the second guide plate 52, the limitation of the movement track of the first material in the feeding process can be further ensured, and the first material can smoothly fall into the first set position range. Because the second guide channel comprises the curved plate 5211, the tail end of the curved plate 5211 is downwardly curved to the other side of the top of the second guide plate 52, and the first material is ensured to fall from the side surface or the position close to the side of the device provided by the invention through the reversing action of the curved plate 5211, the dislocation distance degree between the first material and a second material blanking area (second set position range) is increased, and the phenomenon of blanking intersection between the first material and the second material can be further avoided on the premise of ensuring device integration and low floor space. Because when the turning plate 22 inclines downwards, the guide falling channel 221 is close to the tail end of the turning plate 22 and forms a splayed structure with a wider end far away from the tail end of the turning plate 22 and a narrower end near the tail end of the turning plate 22, so that part of the second material falling from the turning plate 22 can accurately fall into the second set position range under the guide effect of the guide falling channel 221, and the technical problem that the material separation purity is low due to the fact that the second material falls onto the second guide plate 52 in the falling process is solved.

As shown in fig. 4b, a second material guiding plate is further disposed below the blanking through hole 611, and the second material falling from the blanking through hole 611 can fall onto the inclined surface of the second material guiding plate 909, and fall into the second material falling area together with the second material falling from the guiding channel 221 under the guidance of the inclined surface of the second material guiding plate 909.

Example 2

As shown in fig. 4-9, the present embodiment is different from the above embodiments in that a specific way of preferably cooperating the hand-held lever 11, the sliding plate 32, the flipping plate 22, and the second guide plate 52 with each other is provided.

Comprises a first connecting rod 811, a second connecting rod 812, a lifting rack 813, a first gear 814, a rotating disc 815, a third connecting rod 816 and a second gear 817. The lower end of the turning plate 22 is rotationally matched with the lower end of the opening side of the side guard 3, specifically, the lower end of the turning plate 22 may be rotationally connected with the lower end of the opening side of the side guard 3 through a hinge or, as shown in fig. 3b, the lower end of the turning plate 22 is connected to a first shaft 819, two ends of the first shaft 819 are rotationally matched with two sides of the lower end of the opening side (inner walls of the two side plates 31) respectively, and specifically, the first shaft 819 may be rotationally connected with two sides of the lower end of the opening side (inner walls of the two side plates 31) through a bearing.

In some embodiments, the first elastic member 818 includes a torsion spring, and the torsion spring is sleeved on the first shaft 819, and both ends of the torsion spring are respectively connected to the turning plate 22 and the side guards 3.

In some embodiments, the first elastic member 818 includes a compression spring, and both ends of the compression spring are connected to the turning plate 22 and the side barrier 3 respectively or both ends of the compression spring are hooked on the turning plate 22 and the side barrier 3 respectively. Of course, the first elastic member 818 may be other prior art springs such as a tension spring or other elastic members.

The upper end of the first connecting rod 811 is hinged with the upper end of the turnover plate 22, the lower end of the first connecting rod 811 is hinged with one end of the second connecting rod 812, the other end of the second connecting rod 812, the rotating disc 815 and the first gear 814 are all connected on the second shaft 820, and both ends of the second shaft 820 are rotatably matched with the frame 6. The first guide plate 51 is fixed to the frame 6. A vertical guide rail 821 is connected to the frame 6, the upper end of the lifting rack 813 extends into the vertical guide rail 821 to be in sliding fit with the vertical guide rail 821, one side of the lower end of the lifting rack 813 is engaged with the first gear 814, and two ends of the third connecting rod 816 are eccentrically hinged to the first gear 814 and hinged to the second guide plate 52. The second gear 817 is engaged with the other side of the lower end of the lifting rack 813, the handheld rod 11 and the second gear 817 are both connected to the third shaft 822, and two ends of the third shaft 822 are in running fit with the frame 6.

The extension mechanism 7 comprises a wheel disc 71, a push rod 72, a movable rod 73, an extension rod 74 and a guide sleeve 75, wherein the push rod 72 is eccentrically hinged with the wheel disc 71, a linear through groove is formed in the movable rod 73, the push rod 72 extends into the linear through groove, one end of the extension rod 74 is connected with the movable rod 73, the other end of the extension rod 74 is in sliding fit with the guide sleeve 75, and the guide sleeve 75 can be fixed on the rack 6. The wheel 71 is connected to a fourth shaft 823, which shaft 823 is rotatably engaged with the frame 6. The bevel gear transmission device further comprises a driving bevel gear 826, a driven bevel gear 828 and a transmission device, wherein the driving bevel gear 826 is in linkage with a second gear 817 through the transmission device, and the driven bevel gear 828 is coaxially connected with the wheel disc 71 and is meshed with the driving bevel gear 826.

As shown in fig. 9, the transmission may be a prior art belt transmission or a chain transmission. The present embodiment is described by taking a transmission device as a belt transmission device, and includes a driving pulley 8251, an idle pulley 8252, and a belt 8253 sleeved on the driving pulley 8251 and the idle pulley 8252. The driving pulley 8251 is connected to the third shaft 822, the idler pulley 8252 and the driving bevel gear 826 are connected to the rotating shaft 827, the rotating shaft 827 is rotationally engaged with the frame 6, and the driven bevel gear 828 is connected to the fourth shaft 823.

According to the invention, the handheld rod 11 is rotated to drive the third shaft 822 to rotate, the second gear 817 rotates to drive the lifting rack 813 to move, the first gear 814 meshed with the lifting rack 813 is driven to rotate, the second shaft 820 is driven to rotate, the rotating disc 815 is driven to rotate, the second guide plate 52 is driven to slide along the guide of the rack 6 through the transmission of the third connecting rod 816, and the blanking through hole 611 is exposed; meanwhile, the second shaft 820 rotates to drive the second connecting rod 812 to rotate, and the first connecting rod 811 drives the turnover plate 22 to rotate downwards; meanwhile, the second gear 817 rotates to drive the third shaft 822 to rotate, so as to drive the driving pulley 8251 to rotate, the belt 8253 drives the inert pulley 8252 to rotate, and further drives the rotating shaft 827 to rotate, and further drives the driving bevel gear 826 to rotate, and drives the driven bevel gear 828 to rotate, so as to realize the rotation of the fourth shaft 823, the linkage wheel disc 71 rotates, the push rod 72 rotates to drive the movable rod 73, the extension rod 74 moves in the direction of the guide sleeve 75, and the sliding plate 32 is driven to push out the turnover plate 22 in the direction of the position, so as to realize the mutual cooperation of the handheld rod 11, the sliding plate 32, the turnover plate 22 and the second guide plate 52. When the hand-held lever 11 is rotated again, the hand-held lever 11, the sliding plate 32, the turnover plate 22 and the second guide plate 52 cooperate with each other for the same reason. The extension bar 74 of the present invention is preferably attached to the slide plate 32.

In some embodiments, sealing strips are also provided at the edges of the roll-over panel 22 and the sliding panel 32. The relative tightness between the turnover plate 22 and the side baffle plate 3 and between the sliding plate 32 and the side plate 31 is increased by the sealing strips.

In some embodiments, a friction strip made of rubber is disposed on the guide rail 821, so as to increase the friction coefficient of the upper end of the lifting rack 813 matching with the vertical guide rail 821, and further ensure the stability of the lifting rack 813 in the non-motion state.

As shown in fig. 1 and 2, in some embodiments, the extension mechanism 7 of the present invention includes a steering wheel 76, a driving arm 77, an extension rod 74, and a guide sleeve 75, wherein the steering wheel 76 is connected to a fourth shaft 823, one end of the driving arm 77 is eccentrically hinged to the steering wheel 76, the other end of the driving arm 77 is hinged to one end of the extension rod 74, and the other end of the extension rod 74 is slidably engaged with the guide sleeve 75.

Example 3

As shown in fig. 4, the present embodiment is different from the above embodiments in that: the side shutter 3 is provided with a connecting plate 91 and a second elastic member 92, and the second elastic member 92 is provided between the sliding plate 32 and the connecting plate 91. The second elastic member 92 is preferably a spring such as a compression spring, and both ends thereof may be connected to or hooked with the sliding plate 32 and the connecting plate 91, respectively.

According to the invention, the connecting plate 91 and the second elastic piece 92 are arranged on the side baffle 3, when the sliding plate 32 is pushed to move towards the position direction of the turnover plate 22, the second elastic piece 92 deforms, so that when the extension rod 74 is connected with the sliding plate 32 and when the sliding plate 32 is reset to move back to the position direction of the turnover plate 22, the second elastic piece 92 is used for resetting the elastic force, and the resetting accuracy of the sliding plate 32 is ensured; when the protruding bar 74 is not coupled with the sliding plate 32, the restoration of the sliding plate 32 is achieved by the second elastic member 92.

Preferably, a guide slot 311 is opened on the side plate 31, and a side portion of the sliding plate 32 is slidably engaged with the guide slot 311.

Example 4

As shown in fig. 4 and 11, the present embodiment is different from the above embodiments in that: the two groups of meshes are respectively distributed at two sides of the bottom of the screen 21, an upward-raised material guiding structure is formed on the upper surface of the middle area of the bottom of the screen 21, and the side surface of the material guiding structure is a slope. A first guide plate 51, a second guide plate 52, and a blanking passage 61 are provided on both sides of the lower portion of the screen 21. The projection of the end of the guide passage 221 in the vertical direction falls within the gap between the two sets of second guide plates 52.

Because the invention adopts the up-down shaking mode to realize the shaking of the screen 21, namely the lifting mechanism 4 is required to be arranged at the bottom of the screen 21, the lifting mechanism 4 can occupy the mesh opening point position of the screen 21, in order to reduce the influence of the lifting mechanism 4 on the mesh opening point position, the meshes are divided into two groups which are respectively distributed at the two sides of the bottom of the screen 21, and the lower surface of the middle area of the bottom of the screen 21 of the lifting mechanism 4 is matched. Due to the structure, the middle area of the bottom of the screen 21 is of a solid structure, so that materials in the middle area can be screened in time. According to the invention, the guide structure 211 which is upwards raised is formed on the upper surface of the middle area at the bottom of the screen 21, the side surface of the guide structure is a slope, and when the material is screened, the material can continuously move towards meshes at two sides of the bottom of the screen 21 under the inclined guide of the slope structure, so that the complete screening effect of the material is ensured.

Further, the middle area of the bottom of the sliding plate 32 of the present invention is provided with a through slot with a downward opening, and the cross-sectional shape of the through slot is matched with the cross-sectional shape of the material guiding structure 211.

Example 5

As shown in fig. 2, the present embodiment is different from the above embodiments in that: the invention provides a lifting mechanism 4 with a preferable structure, which comprises a cam 41, a cam rotating shaft 42 and a driving motor 43, wherein one end of the cam rotating shaft 42 is connected with an output shaft of the driving motor 43, the fixed end of the driving motor 43 can be fixed on a frame 6, the other end of the cam rotating shaft 42 is in rotating fit with the frame 6, the cam rotating shaft 42 is arranged below a screen 21, the cam 41 is connected with the cam rotating shaft 42 and is in contact with the bottom of the screen 21, and the driving motor 43 is used for driving the cam 41 to rotate.

According to the invention, by starting the driving motor 43, the output shaft of the driving motor 43 rotates to drive the cam rotating shaft 42 connected with the output shaft of the driving motor 43 to rotate, so as to drive the cam 41 to rotate, when the convex part of the cam 41 is contacted with the bottom of the screen 21, the cam 41 rotates to drive the screen 21 to move up and down, and thus the screen 21 shakes up and down. The drive motor 43 of the present invention is preferably a servo motor, but it is also possible to rotate the cam shaft 42 manually instead of rotating the drive motor 43.

As shown in fig. 10, a roller 44 is rotatably connected to the bottom of the screen 21, and the cam 41 is in rolling contact with the driven roller 44, and preferably, a circle of limiting grooves are formed in the cam 41, and the roller 44 is always limited in the limiting grooves.

Example 6

As shown in fig. 12, the present embodiment is different from the above-described embodiments in that: a fixed block 62 and a vertical shaft 63 are fixed on the frame 6, a limit block 64 is matched on the vertical shaft 63 in a sliding mode, and the limit block 64 can be moved downwards to enable the bottom of the limit block 64 to be in contact with the top of the fixed block 62. A third elastic member 65 is further provided between the hand lever 11 and the frame 6, and the third elastic member 65 is assembled such that the hand lever 11 is inclined and the flipping panel 22 is rotated to be inclined downward. When the handheld rod 11 is vertical, the turning plate 22 covers the opening side of the side baffle 3, and the handheld rod 11 can be pressed against the side surface of the limiting block 64 supported on the fixing block 62; the limiting block 64 is moved upwards until the holding rod 11 is separated, and the third elastic element 65 can drive the holding rod 11 to be reset to the inclined state. The third elastic member 65 may be a torsion spring, which is sleeved on the third shaft 822, and two ends of the torsion spring may be connected to the handheld lever 11 and the frame 6, respectively. The third elastic element 65 may also be a tension spring or a compression spring, and two ends of the tension spring or the compression spring are respectively connected with the handheld rod 11 and the rack 6 or hooked in the mounting hole of the handheld rod 11 and the mounting hole of the rack 6.

According to the invention, when the handheld rod 11 is rotated to be vertical, the handheld rod 11 can be pressed against the side surface of the limit block 64 supported on the fixed block 62, so that the position stability of the handheld rod 11 is further ensured, the position stability among the sliding plate 32, the turnover plate 22 and the second guide plate 52 which are linked with the handheld rod is further ensured, and the dislocation movement of each element in the screening working process is avoided. When the second material in the screen 21 is discharged, the hand-held rod 11 can be reset by moving the limit block 64 upwards, and the turnover plate 22, the second guide plate 52 and the sliding plate 32 are linked to move to discharge.

Compared with the fastening mode of the handheld rod 11 shown in fig. 1, the fastening mode of the handheld rod 11 is better in operation flexibility because the frame 6 is provided with the first threaded hole and the handheld rod 11 is provided with the second threaded hole, when the handheld rod 11 rotates to be vertical, the handheld rod 11 extends into the first threaded hole and the second threaded hole through the threaded fit of the bolt 65 and the handheld rod 11 is always manually held by a worker to lock the handheld rod 11.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A sieving device is characterized by comprising a handheld rod, a screen, a turnover plate, a side baffle, a lifting mechanism, a first guide plate, a second guide plate, a discharging channel and an extending mechanism;

the side baffle comprises two side plates and a sliding plate which are oppositely arranged, and the two side plates and the sliding plate can form a structure with three closed sides, one open side and up-down conduction; the turnover plate is in running fit with the opening side of the side baffle plate, and the first elastic piece is assembled to enable the turnover plate to cover the opening side of the side baffle plate; the stretching mechanism can stretch out to move to drive the sliding plate to slide towards the position direction of the turnover plate; one side of the screen is attached to the inner wall of the turnover plate, and the other three sides of the screen can be respectively attached to the inner walls of three mutually closed sides of the side baffle plates; the lifting mechanism is used for driving the screen to move up and down in a limiting cavity formed by the turnover plate and the side baffle;

the first guide plate and the second guide plate are positioned below the screen, and the first guide plate and the second guide plate are in head-to-tail contact to form a transition from the top of the starting end of the first guide plate to the top of the tail end of the second guide plate in a mode of gradually linearly reducing the height; the blanking channel is positioned below the second guide plate, and when the first guide plate is in head-to-tail contact with the second guide plate, the projections of the first guide plate and the second guide plate in the vertical direction completely cover the projection of the blanking through hole in the blanking channel in the vertical direction; the first material falling from the meshes of the screen can move downwards along the guidance of the first guide plate and the second guide plate until falling from the top of the tail end of the second guide plate;

the handheld rod is rotated to synchronously drive the sliding plate to move towards the position direction of the turnover plate, the turnover plate turns downwards, and the second guide plate moves back to the first guide plate until the blanking through hole is exposed; and the second material in the screen is synchronously moved towards the position direction of the turnover plate until one part of the second material in the screen can fall into the blanking through hole from the side opening between the turnover plate and the side baffle plate, and the other part of the second material in the screen can fall from the inclined turnover plate from top to bottom.

2. The screening apparatus of claim 1 wherein said side dams have a connecting plate and a second resilient member disposed therebetween.

3. The screening device of claim 1, wherein two sets of said mesh openings are respectively disposed on both sides of said bottom of said screen, and an upwardly raised material guiding structure is formed on the upper surface of the middle region of said bottom of said screen, and the side surface of said material guiding structure is a slope; the first guide plate, the second guide plate and the blanking channel are arranged on two sides below the screen.

4. The screening apparatus of claim 1, further comprising a first link, a second link, a lifting rack, a first gear, a turning wheel, a third link; the upper end of the first connecting rod is hinged to the turnover plate, the lower end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the second connecting rod and the rotating wheel are coaxially connected with the first gear, the lifting rack is meshed with the first gear, and the two ends of the third connecting rod are eccentrically hinged to the first gear and the second guide plate respectively.

5. The screening apparatus of claim 4, further comprising a second gear, said second gear being engaged with said lifting rack, said hand held rod being coaxially connected to said second gear.

6. The screening apparatus of claim 1, wherein the elevating mechanism comprises a cam, a cam shaft, and a driving motor, the cam shaft is disposed under the screen in a rotation fit manner, the cam is connected to the cam shaft and contacts with the bottom of the screen, and the driving motor is used for driving the cam to rotate.

7. The screening device of claim 1, wherein the extension mechanism comprises a wheel disc, a push rod, a movable rod, an extension rod and a guide sleeve, the push rod is eccentrically hinged to the wheel disc, the movable rod is provided with a linear through groove, the push rod extends into the linear through groove, one end of the extension rod is connected with the movable rod, the other end of the extension rod is in sliding fit with the guide sleeve, and the rotation of the wheel disc can cause the extension rod to reciprocate along the guide sleeve.

8. The screening device of claim 7, further comprising a drive bevel gear, a driven bevel gear, a transmission, wherein the drive bevel gear is linked to the hand held lever through the transmission, and the driven bevel gear is coaxially connected to the wheel disc and is engaged with the drive bevel gear.

9. The screening device of claim 1, wherein a fixed block, a vertical shaft, on which a stopper is slidably fitted, is fixed on the frame, and downward movement of the stopper causes the bottom of the stopper to contact the top of the fixed block; a third elastic piece is arranged between the handheld rod and the rack, and the third elastic piece is assembled to enable the handheld rod to be inclined and the turnover plate to rotate to be inclined downwards; when the handheld rod is vertical, the turnover plate covers the opening side of the side baffle, and the handheld rod can be pressed against the side face of the limiting block supported on the fixed block; the limiting block is moved upwards until the handheld rod is separated, and the third elastic piece can drive the handheld rod to reset to an inclined state.

10. A concrete aggregate classifying and separating blanking device based on the sieving device of any one of claims 1 to 9, it is characterized in that a first guide channel and a second guide channel are respectively arranged on the first guide plate and the second guide plate, the first guide channel comprises a first guide baffle and a second guide baffle, the first guide baffle and the second guide baffle are respectively positioned at two sides of the top of the first guide plate, the guide directions of the first guide baffle and the second guide baffle are consistent with the inclination direction of the first guide plate, the second guide passage includes a bent plate provided at one side of a top of the second guide plate, when the first guide plate is in end-to-end contact with the second guide plate, the starting end of the bent plate can be in contact with the tail end of the second guide baffle, and the tail end of the bent plate is bent downwards to the other side of the top of the second guide plate; a guide channel is arranged on one surface of the turnover plate, which is opposite to the sliding plate; when the turnover plate is inclined downwards, the guide and falling channel is close to the tail end of the turnover plate and forms a splayed structure with a wider end far away from the tail end of the turnover plate and a narrower end close to the tail end of the turnover plate; coarse aggregate can fall from first direction passageway, second direction passageway, and fine aggregate can fall from leading the passageway that falls.