115results about How to "Improve sand screening efficiency" patented technology

The invention discloses a circulating type sand sieving device for building engineering. The circulating type sand sieving device for building engineering comprises a stirring cavity, a sieving cavity, a conveying belt and a circulating mechanism, wherein a motor is further arranged at the upper end of the stirring cavity; the inner side wall of the sieving cavity is hinged to a hinged plate; a groove is formed in the inner side of the hinged plate; a first spring is arranged in the groove; the left end of the first spring is fixedly connected with a sieve plate; a collecting cavity is formedin the left end of the sieving cavity; and a circulating mechanism is arranged at the left end of the collecting cavity. The circulating type sand sieving device for building engineering is novel in design, the arranged sieve plate vertically moves under the effect of an eccentric wheel to sieve sand, when the sieve plate reaches the highest end, impurities and part of sand on the sieve plate enter the collecting cavity through a through hole, the sand which enters the collecting cavity enters the circulating mechanism through a filter screen, and then enters the stirring cavity through a conveying belt of the circulating mechanism, therefore, the impurities are separately stored effectively, and are treated conveniently, meanwhile, the frequency of secondary sand sieving is reduced, and then the sand sieving efficiency is improved.

The invention discloses a multistage high-efficiency anti-blocking sand screening device. The multistage high-efficiency anti-blocking sand screening device comprises a shell and a screen plate, wherein the upper part of the right side of the shell is connected to a feed hopper; a rotating drum is arranged in the shell; a screen mesh is arranged at the right side of the rotating drum; the screen plate is arranged below the screen mesh; and the upper part of the screen plate is leaned against a hair brush. The multistage high-efficiency anti-blocking sand screening device has the beneficial effects that hardened blocks in coarse sand are efficiently smashed by arranging the rotating screen drum and smashing cutter blades distributed in a staggering manner, thereby improving the sand screening efficiency of the screen drum and saving coarse sand raw materials; the multistage high-efficiency anti-blocking sand screening device is provided with a squeezing plate and a slag discharging opening which are used for collecting large-grained garbage screened out by the screen drum, thereby facilitating the continuous operation and improving the screening efficiency; the multistage high-efficiency anti-blocking sand screening device is provided with the reciprocating screen plate and the hair brush, and the hair brush is used for cleaning the screen plate in real time, thereby avoiding the blockage of the screen plate and improving the screening efficiency; the screening quality is improved through two-stage screening; and the multistage high-efficiency anti-blocking sand screening device is compact in structure and is suitable for screening small batches of coarse sand; and as the multistage high-efficiency anti-blocking sand screening device is provided with idler wheels, the multistage high-efficiency anti-blocking sand screening device is convenient to move and transport.

The invention discloses an efficient sand screening device for construction engineering. The efficient sand screening device comprises a box, a feeding hopper, a first screen plate, a second screen plate, a connecting plate, a connecting block, an electric pushing rod, a sliding sleeve, a spring, a first connecting rod, a ratchet wheel, a first motor, a guiding sleeve, a U-shaped rod, a pushing plate, a hairbrush, a second motor, a second connecting rod, a vertical rod, a conical plate, a movable plate, a rotating shaft and collecting frames. According to the efficient sand screening device for construction engineering, the first screen plate, the second screen plate and the electric pushing rod are arranged, therefore, the size of screen holes can be adjusted, and then sand with different particle sizes can be screened out to meet the different construction operation requirements; the first motor, the ratchet wheel and the first connecting rod are arranged, the first screen plate and the second screen plate can be driven to move left and right through cooperation of the first motor, the ratchet wheel and the first connecting rod, and therefore the sand screening efficiency is improved; the U-shaped rod, the pushing plate, the hairbrush, the second connecting rod, the vertical rod and the second motor are arranged, therefore, sand can be spread on the first screen plate, the hairbrush continuously brushes the second screen plate to avoid the condition that circular holes of the second screen plate are blocked, and then the screening efficiency is further improved.

The invention discloses a multi-stage high-efficiency sand screening device for construction engineering, which comprises a base plate, a sand screening box, a crushing device, a first screen, a second screen, a second spring, a sliding rod, a sliding sleeve, a connecting plate, a wool Brush, transmission mechanism, first gear, first reel, first traction rope, second gear, first cam, second cam, second reel and second traction rope, said transmission mechanism includes motor, The second disc, the movable rod, the first rack and the second rack, the present invention is provided with a crushing device, which crushes the agglomerated sand, avoids affecting the efficiency of sand screening, and is provided with a transmission mechanism, a first winding wheel, The second winding wheel, sliding rod, sliding sleeve, connecting plate and brush drive the brush to move left and right, brush the first screen and the second screen, and avoid the mesh holes of the first screen and the second screen from being blocked , Improve the screening efficiency, equipped with a first cam, a second cam and a second spring, so that the first screen and the second screen shake left and right, further improving the screening efficiency.

The invention discloses a sand screening device used in construction engineering, which comprises a device body; the device body is mainly composed of a base, a support rod, a top plate and a sand screening bucket; the surface of the base is fixedly connected with a support rod, and the top of the support rod is fixedly connected with a top plate , and the device body is provided with a sand sieve bucket, the two sides of the top of the sand sieve bucket are fixedly connected with sleeves, the sleeves are sleeved on the outside of the support rod and slidably connected with the support rod, the support rod is sleeved with a spring, and the surface of the base The two-axis motor is fixedly connected by bolts, and the two sides of the two-axis motor are connected with a rotating shaft. A moving part is set on the rotating shaft, and a sliding block is fixedly connected to the top of the moving part. The surface of the sliding block is inclined to cooperate with the bottom of the sand screening bucket. . The device improves the sand screening efficiency and sand screening effect, and is convenient for people to carry out sand screening. The sand and stones on the sand screening plate move upwards, and the position sensor controls the operation of the second cylinder to open the hinge door, which is convenient for discharging sand and stones, and the vibration is small. , easy to use.

The invention discloses a high-efficiency sand sieving device for municipal construction. The high-efficiency sand sieving device for municipal construction comprises a sieving box. The top of the sieving box is provided with a top plate. A driving motor is arranged on the top plate. An output shaft of the driving motor is coaxially and fixedly provided with a driving belt pulley. A second smashing rotary roller is coaxially and fixedly provided with a fourth driven belt pulley and a third driven belt pulley. A first driving bet is wound around the third driven belt pulley and the driving beltpulley. The right end of a concentric-square-shaped frame is horizontally and fixedly provided with a right guide slide rod which is slidably connected with the right sidewall of the sieving box. Sand entering the sieving box through a feed hopper is scattered by a first smashing rotary roller and the second smashing rotary roller in the rotating process, so that caking sand blocks in the sand are broken up and scattered. Rotary blades rotate to promote scattering of the sand. Meanwhile, wind generated by rotating of the rotary blades promotes flowing of air in the sieving box to play a rolein drying the sand. The fluidity of the sand is improved, and the subsequent sieving effect is improved accordingly.

The invention discloses a circulating sand screening device for a construction site, which comprises a vibrating motor, a screen, a hydraulic cylinder and a circulating conveying device. The vibration of the vibrating motor is used to speed up the screening of the sand by the screen, and at the same time, the sand screening of the sand screen is avoided. The holes cause blockage and affect the normal use of the screen. The screen is set horizontally to fully screen the sand, and the hydraulic cylinder is used to drive the hydraulic rod to extend and then push the frame to rotate along the side hinged with the box, thus realizing the screen. The inclined setting of the screen makes the sand that does not pass through the screen fall into the collection tank under the action of gravity, which realizes the automatic cleaning of the sand that does not pass through the screen, improves the practicability of the equipment, and falls from the screen into the collection tank The sand inside further slides into the cylinder body along the slanting plate, thereby realizing the circular screening of the sand and improving the effect of sand screening.

The invention discloses a gap type sand screening device with an automatic feeding and discharging function. The gap type sand screening device comprises a transverse plate and a sand screening frame;the sand screening frame is located on the upper side of the transverse plate; the two sides of the sand screening frame are both provided with screw rod shafts, and the two screw rod shafts are rotationally connected with the transverse plate through bearings; one end of the sand screening frame is fixed to the upper end face of the transverse plate through a supporting seat; the two screw rod shafts are both provided with driving sleeves which are connected with the two screw rod shafts through threads in a matched mode; the end, away from the supporting seat, of the transverse plate is provided with a vertical lifting barrel which is internally provided with a conveyor auger, and the lifting barrel and the conveyor auger are coaxial; the shaft section of the lower end of the conveyor auger is provided with a first transmission gear, and the first transmission gear is engaged with a sector gear; and the lower end of the lifting barrel is provided with a feeding inlet, and the upperend of the lifting barrel is provided with a discharging outlet located in the upper end of the sand screening frame. The gap type sand screening device is simple in structure, high in sand screeningefficiency, low in manpower labor intensity, capable of automatically conducting feeding and discharging, convenient to control and high in practicality.

The invention discloses an intermittent discharge type multi-stage screening device for building. The device comprises a first screening box, a second screening box, a first sand screening device, a second sand screening device, a second motor, an incomplete gear, a first gear, a second gear, a third gear, a first rack, a first baffle and a second baffle. The first sand screening device comprisesa square frame, a screening net, a first spring, a first motor, a cam and a second spring. Since the first sand screening device and the second sand screening device are arranged, multi-stage sand screening can be carried out to meet different working requirements; since the second motor, the incomplete gear, the first gear, the second gear, the third gear, the first rack, the second gear, the first baffle and the second baffle are arranged, intermittent discharge is achieved by matching the components, the problem that net holes of a screening net are blocked since the one-time discharge amount is too high so as to affect the screening efficiency is avoided, sand on the screening net can be immediately discharged after each screening, and the screening efficiency is prevented from being affected.

The invention relates to a high-efficiency sand screening device for buildings. The high-efficiency sand screening device comprises a bottom plate, a frame device, an air cylinder device, a first filtering device, a second filtering device, a retaining ring device and a centrifugal device, wherein a recycling bin, a first locating rod, a first support rod, a sliding block and a first push-against rod are arranged on the bottom plate; the frame device comprises a first retainer ring, a feeding hopper, a second retainer ring, a first filter screen, a first vibrator, a second filter screen, a first support, a first connecting rod, a second support, a second connecting rod and a first inclined rod; the air cylinder device comprises a material distribution hopper, a first cross bar, a first vertical rod, a second cross bar, an air cylinder, a first pushing rod, a second pushing rod, a third cross bar, a second vertical rod and a fourth cross bar; and the first filtering device comprises a first support plate, a first through hole, a third retainer ring, a third filter screen, a second support rod, a third connecting rod, a third support and a fourth support. The high-efficiency sand screening device can rapidly and effectively screen sands and the blocking phenomenon can be avoided.

The invention discloses sand screening equipment for construction. The sand screening equipment comprises a sand screening box, an electric push rod, a first screen, a second screen, springs, a first gear, a second gear, an incomplete gear, a first rotary shaft, a first motor, a first bevel gear, a second bevel gear, a second rotary rod, cross rods, brushes, a reel and a second motor. The sand screening equipment is provided with the first screen and the second screen, and multi-stage screening can be conducted to meet requirements of different construction operations; the sand screening equipment is provided with the first motor, the first rotary shaft, the incomplete gear, the first gear, the second gear and the springs, the first screen and the second screen are made to shake continuously through cooperation, and the sand screening efficiency is improved; the sand screening equipment is provided with the first bevel gear, the second bevel gear, the second rotary shaft, the cross rods and the brushes, the bottom of the first screen and the top of the second screen are brushed continuously through the brushes, meshes of the first screen and the second screen are prevented from being blocked, and the sand screening efficiency is further improved; and the sand screening equipment is provided with the electric push rod, the reel and the second motor, and discharging is convenient.

The invention discloses a sand screening device for construction, and belongs to the field of architectural engineering. The sand screening device for construction comprises a screening box and a vibrating screen plate, wherein the drive end of a motor is connected with a third rotary shaft; one end, away from the inner side wall of a drive cavity, of a fourth rotary shaft passes through a partition, extends into a screening cavity, and the extending end is connected with a dispersing assembly; one end, away from the third rotary shaft, of a first linking assembly is connected to one end, inside a drive shaft, of a second rotary shaft; one end, away from a rotary rod, of a transmission assembly is connected to the rod wall, inside the drive cavity, of the fourth rotary shaft; and one end,away from a rotary rod, of a reciprocating mechanism is connected to the side wall of the vibrating screen plate. The motor works to drive a first pressure roller and a second pressure roller for pressing sand through the first linking assembly, the dispersing assembly disperses pressed sand onto the vibrating screen plate, and the reciprocating mechanism drives the vibrating screen plate to shakeback and forth to perform sand screening, so that sand screening speed is quickened, and working efficiency of the device is improved.

The invention discloses a sand sieving device for building construction. The device comprises a sieving box, supporting columns and a base, wherein a sand pre-sieving component and a sand grading-sieving component are sequentially arranged from top to bottom in the sieving box; the sand pre-sieving component comprises a first sieving plate, a reset spring, a fixed plate and a driven shaft; and thesand grading-sieving component comprises a pushrod, a discharging hopper, a sieving frame, a telescopic rod and a second sieving plate. According to the device, the sand pre-sieving component and thesand grading-sieving component are driven by a driving component to work simultaneously, a scraping plate in the sand pre-sieving component rotates to turn over sand gathering on the first sieving plate, so that accumulation is prevented, and sand sieving efficiency is improved; and the second sieving plate in the sand grading-sieving component realizes sand grading sieving according to the sizeof the sand, so that the sand sieving quality is improved.

The invention discloses a small efficient sand screening machine for civil engineering. The machine comprises a box body; a sand screening net plate is matched at the bottom of the box body; multiplevibrators are arranged on the lower side of the sand screening net plate; a rotating shaft is arranged in middle of the upper side of the sand screening net plate; spiral blades matched with the bottom of the sand screening net plate are mounted on the rotating shaft; a driven belt wheel is fixedly mounted on the rotating shaft on the right side of the box body; the driven belt wheel is connectedwith a driving belt wheel mounted on an output shaft of a speed reducer through a triangular belt; an input shaft of the speed reducer is connected with an output shaft of a driving motor; and the speed reducer and the driving motor are fixed at the top of the box body. The machine can use one motor for controlling unloading and overturning of sand and prolonging the stop time of the sand, and canadjust the angle to improve the sand screening effect and efficiency and to reduce the production cost.

The invention provides a sand screening device for construction. The sand screening device for the construction comprises a rectangular frame, four machine legs, two symmetrically-arranged baffles, ascreen frame connected to the frame through a pivot and a screen arranged on the screen frame; the frame, the machine legs and the baffles define a space capable of containing a trolley; a rotating shaft is rotatably arranged at the position, corresponding to the end of the free end of the screen frame, of the frame, a plurality of cams are arranged on the rotating shaft, and the circumferential surfaces of the cams abut against the screen frame; and a motor platform is further arranged on the frame, a motor is arranged on the motor platform, and the motor drives the rotating shaft to rotate through a belt transmission mechanism. The sand screening device for the construction is high in sand screening efficiency.

The invention discloses a sand screening device for building construction. The sand screening device comprises a box body, a material collecting box, a material guiding hopper, a circular screen, an installation sleeve, a sponge ring, a screen cylinder, a cam, a feeding hopper, a stepping motor, a material inlet bin, a rotary sleeve, a telescopic rod, an installation plate, a driven gear, a gear ring, a guide rod, a brush, a movable bolt and an arc-shaped screen. According to the sand screening device, the sand can be better screened, the manual operation of the staff is avoided, thus the labor intensity of the staff is greatly reduced, the efficiency of sand screening is greatly improved, the sponge ring is impacted repeatedly by the screen cylinder which is horizontally moved, thus the sand is prevented from clogging the arc-shaped screen and the circular screen, meanwhile the brush is used for cleaning the arc-shaped screen, the screened fine sand is guided into the material collecting box through the material guiding hopper for collection, thus the sand is prevented from clogging screen holes on the arc-shaped screen and the circular screen, the screening efficiency is greatlyimproved, and meanwhile the practicability is also enhanced.

The invention discloses environment-friendly sand sieving equipment for constructional engineering. The environment-friendly sand sieving equipment comprises a vehicle body, the vehicle body comprises a chassis, a front axle bracket is connected to the front portion of the lower end of the chassis through a steering shaft, front wheels are connected to the front axle bracket through a front vehicle axle, and a guiding rod is connected to the steering shaft; a back axle bracket is connected to the back portion of the lower end of the chassis through a following shaft, back wheels are connected to the back axle bracket through a back vehicle axle, and a following rod is connected to the following shaft; a sliding groove is formed in the back portion of the guiding rod, a sliding block is rotatably connected to the front end of the following rod and arranged in the sliding groove in a matched manner, the guiding rod is perpendicularly connected with the front axle bracket, and the following rod is perpendicularly connected with the back axle bracket. According to the equipment, flexible steering can be achieved, and the sand sieving efficiency of a sand sieving device is high.

A high-efficient construction site sand sieving system comprising a base plate, a first rack device, a recovery device, a collection frame, a first frame body device, a second frame body device and a second rack device. A first supporting block and first rolling wheels are mounted on the base plate; the first rack device is formed by a first support, a second support, a first cross rod, a first vertical rod and a second cross rod; the recovery device is formed by a recovery case, a third cross rod and a first fixing block; a first through hole, a first filter net, a first vibrator, second rolling wheels and brush hair; the first frame body device is formed a first frame body, a third rolling wheel, a second filter net, second supporting blocks, first springs and third supports; the second frame body device is formed by a second frame body, a third filter net, a first fixing rod, a second vibrator, a second spring, a fourth rolling wheel and projecting blocks; and the second rack device is formed by a fourth support and a connection rod. Sand can be automatically sieved with high efficiency by the use of the high-efficient construction site sand sieving system.

The invention relates to a rotary sand screening machine comprising a sand screening drum having two open ends, and supporting columns, wherein the supporting columns are arranged on bilateral sides of the sand screen drum; two ends of the sand screening drum are connected with end caps having gears; a central spindle is arranged inside the sand screening drum; two ends of the central spindle extend outside the end caps and are movably connected with the supporting columns; the central spindle is provided with a plurality of blades; a rotating shaft is arranged above the sand screening drum; and the rotating shaft is arranged on the supporting columns; the rotating shaft is movably connected with the supporting columns; a drive gear is sleeved on the rotating shaft; the drive gear is arranged above the end caps; one end of the rotating shaft is connected with an electric motor; the inner surface of the sand screening drum is provided with a gravity sensor; the supporting columns are provided with a controller, an alarm device and a storage battery; the gravity sensor and the alarm device are respectively connected with the controller; and the electric motor, the gravity sensor, the controller and the alarm device are all respectively connected with the storage battery. The problems that the sand screening efficiency is low, the sand agglomeration is hard to be crushed by screening, and the screening mesh is easily broken during the screening are solved by the rotary sand screening machine.

The invention discloses a high-efficient and easy-for-discharging sand screening device used at a construction site. The high-efficient and easy-for-discharging sand screening device comprises a base,a sand screening frame, a screening plate and a sliding rod, wherein the sliding rod is arranged on a right and lower part of the sand screening frame; a bottom of the sliding rod is connected with the base through a telescopic spring; and a resisting plate is fixedly arranged on a left side of the sliding rod and is matched with a rotary resisting wheel. According to the high-efficient and easy-for-discharging sand screening device, through cooperation use of the resisting wheel and the resisting plate, the sliding rod can be driven to impact the sand screening frame continuously during rotation of a rotary rod, so that the sand screening frame which is elastically connected is vibrated so as to screen sand; meanwhile, the sand screening frame is suddenly tilted under impact of the sliding rod, so that the sand on the screening plate is flung about; sand caking is prevented, and sand screening efficiency is improved; after sand screening is finished, the sand screening frame is tilted by pulling a steel rope, so that the sand screening frame is lower on the left and higher on the right; and the sand can automatically slide out of a material outlet pipe under the effect of gravity, and an effect of more convenient discharging is reached.

The invention discloses a sand drying and grading device for building construction. The device comprises a drying box body, wherein a feed hopper is arranged at the top of the drying box body; a double-shaft stirring device is arranged in the drying box body; an electric heater and a humidity sensor are arranged on the inner side wall of the drying box body; a discharge plate is hinged to the bottom of the drying box body; a first vibrating motor is arranged at the bottom of the discharge plate; an annular vibrating basket is arranged at a position obliquely below the discharge plate; a second vibrating motor is arranged on the annular vibrating basket; a screen mesh is arranged in the annular vibrating basket; the bottom of the annular vibrating basket is connected with the top of a fixing groove through a spring; and a collecting basket is arranged in a notch of the fixing groove. According to the device, the sand can be dried and graded, the phenomenon of agglomeration is effectively avoided, the sand with proper water content and proper mesh number is finally obtained, the sand screening efficiency is improved, and the labor intensity of workers is reduced.

The invention discloses a sand screening device for building construction, which includes a feed box. The sand screening device for building construction has a simple structure and stable operation. The second gear motor drives the screen material cylinder to rotate to perform coarse screening of sand and gravel. Layered screening, the sieve plate rotates and lifts to carry out secondary screening of the gravel to improve the screening efficiency and quality of the gravel. The feeding hopper and slag discharge plate can be turned and adjusted to facilitate the discharge of coarse slag on the upper side and inner side of the sieve material cylinder. The outer pipe and the inner pipe are driven to rotate by the first reduction motor, so that the sieve plate rotates in the sliding seat with the inner pipe, and the sand falling from the blanking plate is evenly distributed on the sieve plate under the action of centrifugal force, and cooperates with the sieve plate The movement in the vertical direction makes the gravel quickly pass through the sieve plate, which improves the efficiency of sand screening. The separation of coarse sand and fine sand is realized through the partition plate, which is more convenient to use, simple in structure, high in sand screening efficiency, and reduces the labor intensity of workers. , more convenient to use.

The invention discloses a novel sand screening device for constructional engineering. The device comprises a sand inlet groove, a screening plate, a bottom plate and a shell, wherein the shell is arranged at the top of the bottom plate, a mounting frame is transversely arranged at the upper end of the inner wall of the shell, a mounting shaft is vertically arranged in the center of the mounting frame, a second gear is arranged in the position, on the outer side of the mounting shaft, in the mounting frame, an electric piston rod is arranged on one side of the interior of the mounting frame, asecond rack matched with the second gear is transversely arranged at the output end of the electric piston rod, the top end of the mounting shaft extends to the outer side of the mounting frame and isprovided with a striker plate, a mounting plate is fixedly connected to the position, above the striker plate, of the inner wall of the shell, and the sand inlet groove is formed in the top end of the shell. According to the device, through ingenious structural design, intermittent falling is achieved, a transverse rod and a protruding strip can be driven to stir back and forth, sand accumulationis effectively prevented, and meanwhile, sand screening can be accelerated, and the working efficiency is improved.

The present invention relates to a screening device, in particular to a fine sand screening device capable of automatically discharging coarse sand, comprising a sand feeding cylinder assembly, a rotating disk assembly, a sand screening assembly, a coarse sand collection assembly, a sand screening drive assembly and The installation frame assembly, the sand inlet barrel assembly includes the sand inlet barrel body, the sand falling pipe, the sand rotating anti-blocking device, the upper supporting plate, the fixing column and the lower supporting plate; the lower end of the sand inlet barrel body is welded and connected to the falling Sand pipe; the lower end of the sand rotating anti-blocking device is connected to the inside of the sand inlet barrel body in rotation, and the upper end of the sand rotating anti-blocking device is connected to the upper supporting plate in a rotating fit, and the lower end of the upper supporting plate is fixed by The column is connected to the lower supporting plate; the sand falling pipe is connected to the lower supporting plate through threads. The invention can effectively solve the problem that the sand screening device in the prior art cannot automatically discharge the remaining coarse sand after fine sand screening; the invention can automatically discharge the coarse sand without manual cleaning, and its sand screening efficiency is high, and Sand works better.

The invention discloses an environment-friendly sand screening equipment for construction and municipal use, which includes a car body, the car body includes a chassis, the front part of the lower end of the chassis is connected with a front axle frame through a steering shaft, and the front axle frame passes through The front axle is connected with the front wheel, the steering axle is also connected with the guide rod, the rear part of the lower end of the chassis is connected with the rear axle frame through the follower shaft, and the rear axle frame is connected with the rear wheel through the rear axle. The follower shaft is also connected with a follower rod, the rear part of the guide rod is provided with a slide groove, and the front end of the follower rod is connected with a slide block, and the slide block is cooperatingly arranged in the slide groove. The guide rod is vertically connected with the front axle frame, and the follower rod is vertically connected with the rear axle frame. The equipment of the invention can be turned flexibly, and the sand screening device has high sand screening efficiency.

The invention relates to the technical field of building devices, and discloses an efficient sand screening device for a construction site and a using method thereof.The efficient sand screening device comprises a sand screening device body, the inner wall of the sand screening device body is rotationally connected with a sand screening roller, the upper surface of the sand screening device body is fixedly connected with a frame rod, and the inner wall of the frame rod is rotationally connected with a reciprocating lead screw; the outer wall of the reciprocating lead screw is in threaded connection with a blowing head, the inner wall of the blowing head is slidably connected with a sliding rod, and the two ends of the sliding rod are fixedly connected with the frame rods. According to the sand screening device, the air pump, the pipeline, the communicating assembly, the air blowing head and the like are arranged and used in cooperation, when the sand screening roller conducts sand screening, the air blowing head is inflated through the air pump, then air is blown to the sand screening roller through the air blowing head, and small sand grains clamped on meshes of the sand screening roller are blown off through air blown to the sand screening roller through the air blowing head; and small sand grains clamped on meshes of the sand screening roller are prevented from blocking sand screening of the device, so that the sand screening efficiency of the device is improved.

The invention discloses a multifunctional construction machinery sand screening machine, and relates to the technical field of mechanical equipment for construction sites. The multifunctional construction machinery sand screening machine comprises a crushing barrel, a sand screening fan and a distribution box, wherein a fixed screen plate, a rotary screen plate and a crushing roller are arranged in the crushing barrel and are rotationally matched; and a screening air pipe and a speed reducing air pipe are arranged on the surface of the sand screening fan, and both the screening air pipe and the speed reducing air pipe communicate with the crushing barrel. According to the multifunctional construction machinery sand screening machine, the crushing barrel is arranged, a crushing column of the fixed screen plate is matched with the rotary screen plate to shear and crush bonded sand blocks so as to improve the sand screening efficiency, and the arranged crushing roller is located at the uppermost part of the crushing barrel to preliminarily crush sand so as to facilitate subsequent layer-by-layer screening; the speed reducing air pipe and the screening air pipe are arranged, the sand screening fan is used for blowing air, and rapidly falling sand flow is reduced through the speed reducing air pipe, so that subsequent accurate screening is facilitated; and meanwhile, light impurities in the decelerated sand flow are screened out by using the screening air pipe, or the sand is directly screened into fine sand and coarse sand, so that the working efficiency is improved.