阅读说明：本技术 一种透水砖用面砂筛选设备 (Facing sand screening equipment for water permeable bricks ) 是由 谢俊斌 蒋继云 于 2020-07-07 设计创作，主要内容包括：本发明属于面砂筛选设备技术领域,具体的说是一种透水砖用面砂筛选设备,包括机架；所述机架上部自左向右依次设有一组筛筒；所述筛筒直径次增大,且相邻两个筛筒的连接部相互嵌套并转动连接；所述筛筒底部设有一对滚轴,滚轴用于支撑筛筒旋转；所述筛筒一端固连有外齿圈,机架上与外齿圈对应位置通过支架固连有电机；所述电机的输出轴固连的齿轮与外齿圈啮合；所述筛筒靠近外齿圈对应位置通过支架固连有进料斗；相邻所述筛筒连接处直径较小的筛筒外周设有一对一号卡块,直径较大的筛筒内周设有二号卡块；本发明通过电机正反向转动时配合一号卡块与二号卡块增加筛筒震荡,减少筛孔堵塞。(The invention belongs to the technical field of facing sand screening equipment, and particularly relates to facing sand screening equipment for water permeable bricks, which comprises a rack; a group of screen drums are sequentially arranged on the upper part of the rack from left to right; the diameters of the screen cylinders are increased for several times, and the connecting parts of two adjacent screen cylinders are nested and rotatably connected with each other; the bottom of the screen drum is provided with a pair of rolling shafts, and the rolling shafts are used for supporting the screen drum to rotate; one end of the screen drum is fixedly connected with an outer gear ring, and a motor is fixedly connected to the position, corresponding to the outer gear ring, of the rack through a support; a gear fixedly connected with an output shaft of the motor is meshed with the outer gear ring; the corresponding position of the sieve cylinder close to the outer gear ring is fixedly connected with a feed hopper through a support; a pair of first clamping blocks is arranged on the periphery of the sieve drum with a smaller diameter at the joint of the adjacent sieve drums, and a second clamping block is arranged on the inner periphery of the sieve drum with a larger diameter; according to the invention, when the motor rotates forwards and backwards, the first clamping block and the second clamping block are matched to increase the vibration of the screen cylinder, so that the blockage of the screen holes is reduced.)

1. The utility model provides a face sand screening installation for brick permeates water which characterized in that: comprises a frame (1); a group of screen drums (11) are sequentially arranged on the upper part of the rack (1) from left to right, and a group of screen holes (12) are uniformly distributed on the circumference of each screen drum (11); the diameter of each screen cylinder (11) is increased for several times, and the connecting parts of two adjacent screen cylinders (11) are nested and rotatably connected with each other; the bottom of the screen drum (11) is provided with a pair of rolling shafts (13), the top of the frame (1) is provided with supports (14) at positions corresponding to the two ends of the rolling shafts (13), the rolling shafts (13) are rotatably connected with the supports (14), and the rolling shafts (13) are used for supporting the screen drum (11) to rotate; one end of the screen drum (11) is fixedly connected with an outer gear ring (15), a motor (16) is fixedly connected to the position, corresponding to the outer gear ring (15), on the rack (1) through a support, and the motor (16) is connected with a power supply through a controller; a gear (17) fixedly connected with an output shaft of the motor (16) is meshed with the outer gear ring (15); a feed hopper (18) is fixedly connected to the corresponding position of the screen drum (11) close to the outer gear ring (15) through a support; a one-to-one clamping block (2) is arranged on the periphery of the sieve drum (11) with a smaller diameter at the joint of the adjacent sieve drums (11), and a second clamping block (21) is arranged on the inner periphery of the sieve drum (11) with a larger diameter; when the motor (16) rotates forwards and backwards, the first clamping block (2) and the second clamping block (21) are matched to increase the vibration of the screen drum (11), so that the blockage of the screen holes (12) is reduced.

2. The facing sand screening apparatus for water permeable bricks according to claim 1, wherein: the screen drum (11) is conical and gradually increases in diameter in the direction away from the feed hopper (18); through conical sieve section of thick bamboo (11) reduce the rotation resistance of adjacent sieve section of thick bamboo (11) junction, further increase sieve section of thick bamboo (11) and vibrate, increase screening efficiency.

3. The facing sand screening apparatus for water permeable bricks according to claim 2, wherein: a set of balancing weight (22) has been arranged to sieve a section of thick bamboo (11) periphery straggly, drives sieve a section of thick bamboo (11) rotation with higher speed through balancing weight (22) dead weight, further increases a sieve section of thick bamboo (11) and vibrates, further increases screening efficiency.

4. The facing sand screening apparatus for water permeable bricks according to claim 3, wherein: balancing weight (22) link firmly through stay cord (23) and connecting rod (24) and sieve a section of thick bamboo (11) periphery, hit hitting through balancing weight (22) and hit sieve a section of thick bamboo (11), further increase screening efficiency.

5. The facing sand screening apparatus for water permeable bricks according to claim 4, wherein: a set of elastic steel needles (25) are uniformly distributed on the periphery of the roller (13), the steel needles (25) correspond to the sieve holes (12) mutually, and the steel needles (25) are inserted into the sieve holes (12), so that the blockage of the sieve holes (12) is further reduced.

6. The facing sand screening apparatus for water permeable bricks according to claim 5, wherein: the roller (13) is of a hollow structure, and the steel needle (25) penetrates through the side wall of the roller (13) and is connected with the roller (13) in a sliding manner; one end of the steel needle (25) positioned inside the rolling shaft (13) is fixedly connected with a sliding column (26) with the diameter slightly larger than that of the steel needle (25), the bottom of the sliding column (26) is provided with an air valve (27), an air bag (28) is fixedly connected between the air valve (27) and the sliding column (26), and the air bag (28) is in a gas deficiency state; the steel needle (25) is of a hollow structure, the steel needle (25) is communicated with the air valve (27) through an air pipe (29), and the air valve (27) is communicated with a high-pressure air source through a pipeline; the air valve (27) is opened by pressing the air bag (28) through a plurality of sliding columns (26) to inflate the screen drum (11), and the screening efficiency is further increased.

Technical Field

The invention belongs to the technical field of facing sand screening equipment, and particularly relates to facing sand screening equipment for water permeable bricks.

Background

For a long time, due to random exploitation of natural medium-coarse sand, the water area environment is seriously damaged, and certain hidden danger is caused to shipping safety. The current situation has attracted high attention of relevant administrative departments, mining prohibition strength is continuously increased, and many natural rivers and lakes are prohibited from mining permanently. The market supply of natural medium-coarse sand is increasingly tense, and concrete production enterprises are searching for various alternative materials of the natural medium-coarse sand, machine-made sand, washed stone chips, tailing sand, facing sand and the like which can replace fine aggregate silt to go to the field. Because the performance difference of the replaceable fine aggregates is large, the performance of the replaceable fine aggregates is matched and used according to the self performance of various fine aggregates, so that the replaceable fine aggregates are the best choice for concrete enterprises.

A large amount of facing sand resources are stored in the rivers and the downstream of the river basin, the fineness modulus of the facing sand is generally between 0.7 and 0.9, the facing sand belongs to superfine sand, the particle size range is almost below 0.315mm, the specific surface is enlarged, but the mud content is low, and the facing sand is suitable for serving as a filling component of fine aggregates in the small particle size range. The surface sand is used in a proper amount, so that the workability of concrete can be adjusted, the segregation and bleeding mark of the concrete are improved, and the large-scale use of the surface sand is favorable for stabilizing the overall price of fine aggregate in the market and reducing the preparation cost of the concrete due to the lower market price of the surface sand.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problems that the existing screening machine is only suitable for medium sand and coarse sand with larger particle diameter, soil blocks in the surface sand easily block a screen cylinder, the screening efficiency of the surface sand is seriously influenced, the machine needs to be stopped for manual cleaning, the labor intensity is increased, and the screening efficiency of the surface sand is reduced, the surface sand screening equipment for the water permeable brick provided by the invention is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to facing sand screening equipment for water permeable bricks, which comprises a rack; a group of screen drums are sequentially arranged on the upper part of the rack from left to right, and a group of screen holes are uniformly distributed on the circumference of each screen drum; the diameters of the screen cylinders are increased for several times, and the connecting parts of two adjacent screen cylinders are nested and rotatably connected with each other; the bottom of the screen drum is provided with a pair of rolling shafts, the top of the rack is provided with supports corresponding to the two ends of the rolling shafts, the rolling shafts are rotatably connected with the supports, and the rolling shafts are used for supporting the screen drum to rotate; one end of the screen cylinder is fixedly connected with an outer gear ring, a motor is fixedly connected to the position, corresponding to the outer gear ring, of the rack through a support, and the motor is connected with a power supply through a controller; a gear fixedly connected with an output shaft of the motor is meshed with the outer gear ring; the corresponding position of the sieve cylinder close to the outer gear ring is fixedly connected with a feed hopper through a support; a pair of first clamping blocks is arranged on the periphery of the sieve drum with a smaller diameter at the joint of the adjacent sieve drums, and a second clamping block is arranged on the inner periphery of the sieve drum with a larger diameter; when the motor rotates forwards and backwards, the first clamping block and the second clamping block are matched to increase the vibration of the screen cylinder, so that the blockage of screen holes is reduced; when the screening machine works, the existing screening machine is only suitable for medium sand and coarse sand with larger particle diameters, when the screening machine is used for screening the face sand with larger mud content, soil blocks in the face sand easily block a screen cylinder, the screening efficiency of the face sand is seriously influenced, the machine needs to be stopped for manual cleaning, the labor intensity is increased, and the screening efficiency of the face sand is reduced; make No. two fixture blocks at a screen section of thick bamboo reversal time intermittent type's collision fixture block, and then arouse the continuous vibration of a screen section of thick bamboo, the efficiency of shaking off of earth in the increase sieve mesh, and then increase the screening efficiency of a screen section of thick bamboo, further increase the screening efficiency of face sand, reduce artifical clearance frequency, improve production efficiency.

Preferably, the sieve cylinder is conical and gradually increases in diameter in the direction away from the feed hopper; the rotating resistance at the joint of the adjacent screen drums is reduced through the conical screen drums, so that the vibration of the screen drums is further increased, and the screening efficiency is increased; through a conical sieve section of thick bamboo for the face sand in the sieve section of thick bamboo is at a sieve section of thick bamboo rotatory in-process, constantly along with the dead weight to the lower one end nature whereabouts of a sieve section of thick bamboo and remove, and then increases the discharge efficiency of the great impurity of granule after the screening of face sand for the discharge soil block reduces the sieve mesh and blocks up, makes adjacently simultaneously the face sand of sieve section of thick bamboo junction flows downwards fast, reduces the junction that the face sand flows into an adjacent sieve section of thick bamboo, and then reduces the relative pivoted resistance of an adjacent sieve section of thick bamboo, further guarantees the shock effect of a sieve section of thick bamboo, further increases the screening efficiency of face sand.

Preferably, a group of balancing weights are arranged on the periphery of the screen drum in a staggered manner, the screen drum is driven to rotate at an accelerated speed through the self weight of the balancing weights, the vibration of the screen drum is further increased, and the screening efficiency is further increased; drive the balancing weight through a sieve section of thick bamboo and constantly rotate, after the balancing weight rotated the peak, the balancing weight drove a sieve section of thick bamboo rotation with higher speed under the effect of self gravity, and the vibration frequency of a sieve section of thick bamboo is increased to cooperation fixture block and No. two fixture blocks, and then the efficiency of shaking off of earth in the further increase sieve mesh, further increases the screening efficiency of face sand.

Preferably, the balancing weight is fixedly connected with the periphery of the screen drum through a pull rope and a connecting rod, and the screen drum is hit by falling of the balancing weight, so that the screening efficiency is further increased; carry out the activity through stay cord cooperation connecting rod to the balancing weight and link firmly, increase the migration range of balancing weight, and then make the balancing weight rotate the peak along with a sieve section of thick bamboo after, the balancing weight rolls downwards and falls, after the complete tensioning of stay cord, the stay cord drives balancing weight striking sieve section of thick bamboo periphery, and then increases the vibration effect of a sieve section of thick bamboo, further accelerates the earth in the sieve mesh to shake off, further increases the screening efficiency of face sand.

Preferably, a group of elastic steel needles are uniformly distributed on the periphery of the roller, correspond to the sieve pores, and are inserted into the sieve pores, so that the blockage of the sieve pores is further reduced; through the steel needle along with the roll in-process of roller bearing constantly rotatory and insert the sieve mesh in, dredge the clearance fast to the sieve mesh, further increased the unblocked of sieve mesh, guarantee the screening efficiency of face sand, reduce the face sand that the sieve mesh jam arouses and can not fully screen, need carry out the step of secondary screening, and then increase the utilization efficiency of face sand, reduce the energy consumption of face sand extravagant and secondary screening, further improve economic benefits.

Preferably, the roller is of a hollow structure, and the steel needle penetrates through the side wall of the roller and is in sliding connection with the roller; one end of the steel needle, which is positioned in the rolling shaft, is fixedly connected with a sliding column with the diameter slightly larger than that of the steel needle, the bottom of the sliding column is provided with an air valve, an air bag is fixedly connected between the air valve and the sliding column, and the air bag is in a gas deficiency state; the steel needle is of a hollow structure and is communicated with an air valve through an air pipe, and the air valve is communicated with a high-pressure air source through a pipeline; the air valve is opened by extruding the air bag through the plurality of sliding columns to inflate the screen drum, so that the screening efficiency is further improved; block up during the higher stone of hardness in the sieve mesh, hardly clear away through the steel needle, after a plurality of sieve meshes blockked up, seriously reduce the screening efficiency of a sieve section of thick bamboo, the steel needle received the extrusion of stone this moment, make a plurality of steel needles slide to the roller bearing, and then drive traveller extrusion gasbag, because the gasbag is in the insufficient gas state, make behind the more traveller extrusion gasbag, the gasbag fully deforms and makes gasbag internal gas pressure rise, and then make the gasbag top move and open the pneumatic valve, make compressed air spout from hollow steel needle through the trachea, blast the stone and clear away, and then guarantee the sieve mesh unblocked, further increase the screening efficiency of face sand.

The invention has the following beneficial effects:

1. according to the flour sand screening equipment for the water permeable bricks, the motor drives the screen cylinder to continuously and intermittently rotate forwards and backwards, so that the second clamping block intermittently collides with the first clamping block in the reverse rotation time of the screen cylinder, the screen cylinder is further caused to continuously vibrate, the soil shaking-off efficiency in screen holes is increased, the screening efficiency of the screen cylinder is further increased, the screening efficiency of the flour sand is further increased, the manual cleaning frequency is reduced, and the production efficiency is improved.

2. According to the flour sand screening equipment for the water permeable bricks, disclosed by the invention, the plurality of steel needles slide towards the rolling shaft, so that the sliding columns are driven to extrude the air bags, and the air bags are in a gas deficiency state, so that after more sliding columns extrude the air bags, the air bags are fully deformed, the air pressure in the air bags is increased, the air bags are pushed to open the air valves, compressed air is sprayed out from the hollow steel needles through the air pipes, stones are blasted and removed, the sieve holes are ensured to be smooth, and the screening efficiency of the flour sand is further increased.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is a cross-sectional view taken at B-B of FIG. 2;

fig. 5 is a partial cross-sectional view of the roller of the present invention;

in the figure: the device comprises a frame 1, a screen drum 11, screen holes 12, a roller 13, a support 14, an outer gear ring 15, a motor 16, a gear 17, a feed hopper 18, a first fixture block 2, a second fixture block 21, a balancing weight 22, a pull rope 23, a connecting rod 24, a steel needle 25, a sliding column 26, an air valve 27, an air bag 28 and an air pipe 29.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the facing sand screening device for water permeable bricks comprises a frame 1; a group of screen drums 11 are sequentially arranged on the upper part of the rack 1 from left to right, and a group of screen holes 12 are uniformly distributed on the circumference of each screen drum 11; the diameters of the screen cylinders 11 are increased for several times, and the connecting parts of two adjacent screen cylinders 11 are nested and rotatably connected; the bottom of the screen drum 11 is provided with a pair of rollers 13, the top of the frame 1 is provided with supports 14 at positions corresponding to two ends of the rollers 13, the rollers 13 are rotatably connected with the supports 14, and the rollers 13 are used for supporting the screen drum 11 to rotate; one end of the screen drum 11 is fixedly connected with an outer gear ring 15, a motor 16 is fixedly connected to the position, corresponding to the outer gear ring 15, of the rack 1 through a support, and the motor 16 is connected with a power supply through a controller; a gear 17 fixedly connected with an output shaft of the motor 16 is meshed with the outer gear ring 15; a feed hopper 18 is fixedly connected to the corresponding position of the screen drum 11 close to the outer gear ring 15 through a support; a pair of first clamping blocks 2 is arranged on the periphery of the sieve drum 11 with a smaller diameter at the joint of the adjacent sieve drums 11, and a second clamping block 21 is arranged on the inner periphery of the sieve drum 11 with a larger diameter; when the motor 16 rotates forwards and backwards, the first clamping block 2 and the second clamping block 21 are matched to increase the vibration of the screen drum 11, so that the blockage of the screen holes 12 is reduced; when the screening machine works, the existing screening machine is only suitable for medium sand and coarse sand with large particle diameters, when the screening machine is used for screening surface sand with large mud content, soil blocks in the surface sand easily block the screen cylinder 11, the screening efficiency of the surface sand is seriously influenced, the machine needs to be stopped for manual cleaning, the labor intensity is increased, and the screening efficiency of the surface sand is reduced, a large amount of sewage is generated if the surface sand is washed, the sewage treatment cost is high, the motor 16 drives the screen cylinder 11 to continuously intermittently rotate forwards and backwards, a one-to-one fixture block 2 is arranged at the periphery of the screen cylinder 11 with small diameter at the joint of the adjacent screen cylinders 11, and a two-to-one fixture block 21 is arranged at the inner periphery of the screen cylinder 11 with large diameter; make No. two fixture blocks 21 at a screen section of thick bamboo 11 reversal time intermittent type's collision fixture block 2, and then arouse constantly shaking of a screen section of thick bamboo 11, increase the efficiency of shaking off of earth in the sieve mesh 12, and then increase the screening efficiency of a screen section of thick bamboo 11, further increase the screening efficiency of face sand, reduce artifical clearance frequency, improve production efficiency.

As an embodiment of the present invention, the screen cylinder 11 is conical and gradually increases in diameter in a direction away from the feed hopper 18; the rotation resistance at the joint of the adjacent screen drums 11 is reduced through the conical screen drums 11, the vibration of the screen drums 11 is further increased, and the screening efficiency is increased; through conical sieve section of thick bamboo 11 for the face sand in a sieve section of thick bamboo 11 is at sieve section of thick bamboo 11 rotatory in-process, constantly along with the dead weight to the lower one end of a sieve section of thick bamboo 11 nature whereabouts removal, and then increases the discharge efficiency of the great impurity of granule after the screening of face sand for the soil block of discharging reduces sieve mesh 12 and blocks up, makes adjacently simultaneously the face sand of sieve section of thick bamboo 11 junction flows downwards fast, reduces the junction that the face sand flows into adjacent sieve section of thick bamboo 11, and then reduces the relative pivoted resistance of adjacent sieve section of thick bamboo 11, further guarantees the vibration effect of a sieve section of thick bamboo 11, further increases the screening efficiency of face sand.

As an embodiment of the invention, a group of balancing weights 22 are arranged on the periphery of the screen drum 11 in a staggered manner, the self weight of the balancing weights 22 drives the screen drum 11 to rotate at an accelerated speed, so that the oscillation of the screen drum 11 is further increased, and the screening efficiency is further increased; drive balancing weight 22 through a sieve section of thick bamboo 11 and constantly rotate, after balancing weight 22 rotated the peak, balancing weight 22 drove a sieve section of thick bamboo 11 with higher speed and rotates under the effect of self gravity, and cooperation fixture block 2 and No. two fixture blocks 21 increase the vibration frequency of a sieve section of thick bamboo 11, and then further increase the shake-off efficiency of earth in the sieve mesh 12, further increase the screening efficiency of face sand.

As an embodiment of the invention, the counterweight 22 is fixedly connected with the periphery of the screen drum 11 through the pull rope 23 and the connecting rod 24, and the counterweight 22 falls to strike the screen drum 11, so that the screening efficiency is further increased; carry out the activity through stay cord 23 cooperation connecting rod 24 to balancing weight 22 and link firmly, increase balancing weight 22's displacement, and then make balancing weight 22 rotate the peak along with a sieve section of thick bamboo 11 after, balancing weight 22 rolls downwards and falls, after the complete tensioning of stay cord 23, stay cord 23 drives balancing weight 22 striking sieve section of thick bamboo 11 periphery, and then increases sieve section of thick bamboo 11's vibration effect, further accelerates the earth in the sieve mesh 12 to shake off, further increases the screening efficiency of face sand.

As an embodiment of the invention, a group of elastic steel needles 25 are uniformly distributed on the periphery of the roller 13, the steel needles 25 correspond to the sieve holes 12, and the steel needles 25 are inserted into the sieve holes 12 to further reduce the blockage of the sieve holes 12; in the roll in-process through steel needle 25 along with roller 13 constantly rotates and inserts sieve mesh 12, dredges the clearance fast to sieve mesh 12, has further increased sieve mesh 12 unblocked, guarantees the screening efficiency of face sand, reduces the face sand that sieve mesh 12 blockked up and arouses and can not fully screen, need carry out the step of secondary screening, and then increases the utilization efficiency of face sand, reduces the energy consumption of face sand waste and secondary screening, further improves economic benefits.

As an embodiment of the present invention, the roller 13 is a hollow structure, and the steel needle 25 penetrates through the side wall of the roller 13 and is slidably connected with the roller 13; one end of the steel needle 25, which is positioned inside the roller 13, is fixedly connected with a sliding column 26, the diameter of which is slightly larger than that of the steel needle 25, the bottom of the sliding column 26 is provided with an air valve 27, an air bag 28 is fixedly connected between the air valve 27 and the sliding column 26, and the air bag 28 is in a gas loss state; the steel needle 25 is of a hollow structure, the steel needle 25 is communicated with the air valve 27 through an air pipe 29, and the air valve 27 is communicated with a high-pressure air source through a pipeline; the air valve 27 is opened by extruding the air bag 28 through the plurality of sliding columns 26, and the screen drum 11 is inflated, so that the screening efficiency is further increased; block up during the higher stone of hardness in sieve mesh 12, hardly clear away through steel needle 25, after a plurality of sieve meshes 12 block up, seriously reduce the screening efficiency of a sieve section of thick bamboo 11, steel needle 25 receives the extrusion of stone this moment, make a plurality of steel needles 25 slide to roller bearing 13, and then drive traveller 26 extrusion gasbag 28, because gasbag 28 is in insufficient gas state, make behind more traveller 26 extrusion gasbag 28, gasbag 28 fully deforms and makes gasbag 28 internal gas pressure rise, and then make gasbag 28 top move and open pneumatic valve 27, make compressed air spout from hollow steel needle 25 through trachea 29, blast the stone and clear away, and then guarantee that sieve mesh 12 is unblocked, further increase the screening efficiency of face sand.

When the screening machine works, the existing screening machine is only suitable for medium sand and coarse sand with large particle diameters, when the screening machine is used for screening surface sand with large mud content, soil blocks in the surface sand easily block the screen cylinder 11, the screening efficiency of the surface sand is seriously influenced, the machine needs to be stopped for manual cleaning, the labor intensity is increased, and the screening efficiency of the surface sand is reduced, a large amount of sewage is generated if the surface sand is washed, the sewage treatment cost is high, the motor 16 drives the screen cylinder 11 to continuously intermittently rotate forwards and backwards, a one-to-one fixture block 2 is arranged at the periphery of the screen cylinder 11 with small diameter at the joint of the adjacent screen cylinders 11, and a two-to-one fixture block 21 is arranged at the inner periphery of the screen cylinder 11 with large diameter; the second fixture block 21 intermittently collides with the first fixture block 2 when the screen drum 11 rotates reversely, so that the screen drum 11 is continuously vibrated, the soil shaking-off efficiency in the screen holes 12 is increased, the screening efficiency of the screen drum 11 is increased, the screening efficiency of the facing sand is further increased, the manual cleaning frequency is reduced, and the production efficiency is improved; through the conical screen drum 11, the face sand in the screen drum 11 is enabled to naturally fall and move towards the lower end of the screen drum 11 continuously along with the dead weight in the rotation process of the screen drum 11, so that the discharge efficiency of impurities with larger particles after screening of the face sand is increased, the discharge of soil blocks is accelerated, the blockage of the screen holes 12 is reduced, meanwhile, the face sand at the joint of the adjacent screen drums 11 is enabled to rapidly flow downwards, the flow of the face sand into the joint of the adjacent screen drums 11 is reduced, the resistance of the relative rotation of the adjacent screen drums 11 is further reduced, the oscillation effect of the screen drum 11 is further ensured, and the screening efficiency of the face sand is further increased; the balancing weight 22 is driven to rotate continuously through the screen drum 11, after the balancing weight 22 rotates to the highest point, the balancing weight 22 drives the screen drum 11 to rotate at an accelerated speed under the action of self gravity, the first clamping block 2 and the second clamping block 21 are matched to increase the oscillation frequency of the screen drum 11, the soil shaking-off efficiency in the screen holes 12 is further increased, and the screening efficiency of the surface sand is further increased; the balancing weight 22 is movably and fixedly connected through the pull rope 23 and the connecting rod 24, the moving range of the balancing weight 22 is increased, the balancing weight 22 rolls downwards and falls after the balancing weight 22 rotates with the highest point of the screen drum 11, and when the pull rope 23 is completely tensioned, the pull rope 23 drives the balancing weight 22 to impact the periphery of the screen drum 11, so that the vibration effect of the screen drum 11 is increased, the soil in the screen holes 12 is further accelerated to shake off, and the screening efficiency of the face sand is further increased; the steel needles 25 continuously rotate along with the rolling shaft 13 in the rolling process and are inserted into the sieve holes 12, so that the sieve holes 12 are quickly dredged and cleaned, the smoothness of the sieve holes 12 is further increased, the screening efficiency of the face sand is ensured, the problem that the face sand cannot be sufficiently screened due to the blockage of the sieve holes 12 is reduced, the step of secondary screening is required, the utilization efficiency of the face sand is further increased, the waste of the face sand and the energy consumption of the secondary screening are reduced, and the economic benefit is further improved; block up during the higher stone of hardness in sieve mesh 12, hardly clear away through steel needle 25, after a plurality of sieve meshes 12 block up, seriously reduce the screening efficiency of a sieve section of thick bamboo 11, steel needle 25 receives the extrusion of stone this moment, make a plurality of steel needles 25 slide to roller bearing 13, and then drive traveller 26 extrusion gasbag 28, because gasbag 28 is in insufficient gas state, make behind more traveller 26 extrusion gasbag 28, gasbag 28 fully deforms and makes gasbag 28 internal gas pressure rise, and then make gasbag 28 top move and open pneumatic valve 27, make compressed air spout from hollow steel needle 25 through trachea 29, blast the stone and clear away, and then guarantee that sieve mesh 12 is unblocked, further increase the screening efficiency of face sand.

The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.