CN112170163A

CN112170163A - Efficient sand screening machine for producing concrete and working method thereof

Info

Publication number: CN112170163A
Application number: CN202011062066.5A
Authority: CN
Inventors: 吴陈华
Original assignee: Zoomlion Xiangqiao Building Materials Co ltd
Current assignee: Zoomlion Xiangqiao Building Materials Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-01-05

Abstract

The invention discloses a high-efficiency sand screening machine for producing concrete and a working method thereof, wherein a crushing mechanism is arranged at the top of one side of a first supporting table, a second supporting table is connected to the top of the other side of the first supporting table, a collecting box is arranged at the bottom of the other side of the first supporting table, a rotating mechanism is arranged in the middle of the top of the second supporting table, the rotating mechanism is connected with a screening mechanism, a supporting ring is arranged at one side of the top of the second supporting table, one end of the screening mechanism is clamped in the supporting ring, two first supports are welded at the other side of the top of the second supporting table, and a feeding hopper is arranged at the top ends of the two first supports in a matched; after adopting above-mentioned structure, can effectually separate the sand material, make the sand material after the separation satisfy the requirement of production concrete, simultaneously through broken mechanism, break into the tiny particle sand material that satisfies the requirement to the large granule sand material, resources are saved has also improved production efficiency simultaneously.

Description

Efficient sand screening machine for producing concrete and working method thereof

Technical Field

The invention relates to the technical field of building processing equipment, in particular to a high-efficiency sand screening machine for producing concrete and a working method thereof.

Background

In the concrete production process, certain requirements are imposed on the thickness degree of raw sand grains, and the quality of concrete is affected by overlarge sand grains, so that finer sand grains are obtained by screening through a sand screening machine. But the current sand sieving machine of on the other hand mostly exists only static filtration screening, problem that screening efficiency is low, and the large granule sand grain that the screening was collected in addition also is simply piled up, and inconvenient in time is collected and is transported away.

Patent publication No. CN205253535U discloses an electric sand sieving machine, which comprises a base and a screen, wherein the front end of the top surface of the base is low, the rear end of the top surface of the base is high, a height difference of 2m is formed between the front end and the rear end of the top surface of the base, the screen is a flat screen welded on the top surface of the base, and the screen surface of the flat screen is 30-degree gradient with the horizontal; the grid size of the horizontally arranged screen is 15mm multiplied by 15 mm; the horizontally arranged screen is formed by welding phi 12 steel bars in a transverse and longitudinal staggered manner; the front end of base is equipped with abandons the stone baffle, it adopts the steel sheet that thickness is 5mm to abandon stone baffle 3, be fixed with a vibrator on the base. Although the electric sand screening machine is convenient to install and use, low in cost and good in economic benefit, the electric sand screening machine has the problems of poor vibrating sand screening effect and inconvenient collection of large-particle sand grains.

Patent publication No. CN209663708U discloses a high efficiency sand screening machine for producing concrete. Through the mode that sets up filter screen framework, fine sand conveyer belt, roll wheel, hinge post, fluting support column, framework bulge unit, eccentric jack-up unit and receipts material frame unit on the bottom plate, reach the effect of effective screening of sand material. Although the screening automation degree of the sand screening machine is high, the coarse sand after screening is easy to recycle, the screening efficiency of the sand screening machine is not high, large-particle sand particles cannot be synchronously processed, and the working efficiency is reduced.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide a high-efficiency sand screening machine for producing concrete and a working method thereof, wherein the high-efficiency sand screening machine comprises the following steps:

pouring sand into a feeding funnel, enabling the sand to enter an inner cylinder of a screening mechanism through the feeding funnel, starting a second motor, driving a first rotating shaft to rotate, driving a first fluted disc to rotate by the first rotating shaft, driving an outer cylinder and a second fluted disc to rotate by the fluted disc, driving the inner cylinder to rotate by the outer cylinder, screening the sand through a helical blade and a second sieve mesh in the inner cylinder, enabling the sand with the size smaller than the second pore diameter of the sieve mesh to enter an area between the inner cylinder and the outer cylinder through the second sieve mesh, falling into a guide chute from a discharge port along with the rotation of the outer cylinder, and enabling the sand to enter a collection box through a discharge chute; through setting up rotatory urceolus and inner tube to set up helical blade in the inner tube and set up sieve mesh two, make sand material increase the motion distance at the in-process of screening, the effectual screening effect that has improved has increased screening efficiency, carries out abundant screening to sand material, avoids the resource loss too much.

In the screening process of the screening mechanism, sand materials with the size larger than the second aperture of the sieve mesh drop into the crushing tank through the rotation of the inner cylinder, the two first motors are started simultaneously, the two crushing rollers rotate oppositely to crush and crush the sand materials in the crushing tank, and meanwhile, in the crushing process, the air cylinder is started to push the crushing tank body to move back and forth on the first supporting table, so that the crushed sand materials drop into the guide groove through the first sieve mesh, finally slide into the collecting tank, after the screening is finished, the collecting tank is taken out, and the sand materials in the collecting tank are conveyed to the next process; the crushing box body is driven to move back and forth on the top of the first supporting table by the air cylinder, so that the screening speed of the crushing box body is increased, and meanwhile, two crushing rollers which move in opposite directions are arranged in the crushing groove to roll and crush large-particle sand materials, so that the resource utilization rate is improved, and the cost is saved; and screening and crushing are carried out simultaneously, so that the time is saved, and the working efficiency is improved.

The purpose of the invention can be realized by the following technical scheme:

a high-efficiency sand screening machine for producing concrete comprises a first supporting table, a crushing mechanism, a screening mechanism, a feeding funnel, a first support, a second supporting table, a rotating mechanism, a supporting ring and a collecting box, wherein the crushing mechanism is installed at the top of one side of the first supporting table, the second supporting table is connected to the top of the other side of the first supporting table, the collecting box is placed at the bottom of the other side of the first supporting table, the rotating mechanism is arranged in the middle of the top of the second supporting table and connected with the screening mechanism, the supporting ring is arranged on one side of the top of the second supporting table, one end of the screening mechanism is clamped in the supporting ring, the two first supports are welded to the other side of the top of the second supporting table, and the feeding funnel is installed at the tops of the two first supports in a matched;

the crushing mechanism comprises two air cylinders, the two air cylinders are fixedly arranged at the top of a third supporting table and symmetrically distributed about the transverse central line of a first supporting table, piston rods of the air cylinders penetrate through the first connecting table and are arranged on a connecting frame through fixing pins, a crushing groove is formed in the top of a crushing box body, a plurality of first sieve holes are formed in the bottom of the crushing groove and distributed in a matrix manner, a first supporting plate is arranged on one side, close to the air cylinders, of the crushing box body, the connecting frame is welded to the top of the first supporting plate, a second supporting plate is arranged on the other side of the crushing box body, two first motors are fixedly arranged at the top of the second supporting plate, the output shafts of the two first motors are connected with crushing rollers, the two crushing rollers are rotatably arranged in the crushing groove, and sliding bosses are arranged on two, the sliding boss is slidably mounted in the sliding groove.

As a further scheme of the invention: first supporting platform one side is provided with the third brace table, first supporting platform top is provided with two first connecting stations, two the horizontal central line symmetric distribution of first connecting station about first supporting platform, first supporting platform top is provided with two spouts, two the spout is about the horizontal central line symmetric distribution of first supporting platform, two first connecting station is located between two spouts, the guide slot has been seted up at first supporting platform top, the guide slot is located between two spouts, the dead slot has been seted up in the middle of the first supporting platform top, the dead slot is located one side that the first connecting station was kept away from to the guide slot, the standing groove has been seted up to first supporting platform opposite side bottom, the dead slot and standing groove intercommunication are kept away, the collecting box has been placed in the standing groove.

As a further scheme of the invention: the top of the second supporting table is of a slope structure, an installation table is arranged on one side, low in the top, of the second supporting table, and a fixing groove is formed in the middle of the installation table.

As a further scheme of the invention: slewing mechanism includes eight mounts, eight per two divide into a set ofly in the mount, and four group's mounts pass through bolt fixed mounting at a second supporting bench top, and four group's mounts are all filled up the shock pad, eight about a second supporting bench's horizontal central line symmetric distribution, between four group's mounts and the second supporting bench all the mount top is inside all to be installed the bearing, and two sets of front side the mount cooperation is rotated and is installed first axis of rotation, two sets of the rear side the mount is all rotated and is installed the second axis of rotation, two fluted disc two is all installed at second axis of rotation middle part, two fluted discs are installed to first axis of rotation, and two fluted disc one is located first axis of rotation both ends, the one end that the mount table was kept away from to first axis of rotation is connected with the second motor, second motor fixed.

As a further scheme of the invention: screening mechanism includes the urceolus, urceolus outside axial plane is provided with two installation bosss, and there is the ring gear installation boss one side through bolt fixed mounting, urceolus one end is provided with the support round platform, two discharge gates have been seted up to urceolus one end, two the discharge gate is located the support round platform outside, the urceolus passes through the ring gear and connects on slewing mechanism's fluted disc one and fluted disc two, the ring gear is connected with the meshing of fluted disc one and fluted disc two, urceolus internally mounted has the inner tube, the inside fixed mounting of inner tube has two sets of helical blade, and is two sets of helical blade is crisscross to be set up, a plurality of sieve mesh two, a plurality of sieve.

As a further scheme of the invention: the support ring bottom fixedly connected with goes out the feed cylinder, the baffle box has been seted up to support ring inside, go out the inside blown down tank that is provided with of feed cylinder, baffle box and blown down tank intercommunication, the welding of support ring is on the mount table, and urceolus one end cup joints in the support ring, and the discharge gate corresponds in the baffle box position, go out feed cylinder fixed mounting in the fixed slot, go out the feed cylinder bottom and pass the dead slot and extend to the collecting box top.

As a further scheme of the invention: the working steps of the high-efficiency sand screening machine for producing concrete are as follows:

step one, pouring sand into a feeding funnel, enabling the sand to enter an inner cylinder of a screening mechanism through the feeding funnel, starting a second motor, driving a first rotating shaft to rotate, driving a first fluted disc to rotate by the first rotating shaft, driving an outer cylinder and a second fluted disc to rotate by the second fluted disc, driving the inner cylinder to rotate by the outer cylinder, screening the sand through a helical blade and a second sieve mesh in the inner cylinder, enabling the sand with the size smaller than the aperture of the second sieve mesh to enter a region between the inner cylinder and the outer cylinder through the second sieve mesh, falling into a guide chute from a discharge port along with the rotation of the outer cylinder, and then entering a collection box through a discharge chute;

step two, the size is greater than the sand material in the two apertures of sieve mesh, rotate through the inner tube, drop to the broken groove in, start two first motors simultaneously, and make two crushing rollers rotate in opposite directions, roll the breakage to the sand material in the broken groove, simultaneously in crushing process, start the cylinder, promote broken box round trip movement on first supporting station, make the sand material after the breakage pass through sieve mesh one and sieve, drop to the guide slot in, finally in the collecting box that slides, after the screening, take out the collecting box, carry the sand material in the collecting box to process on next step.

The invention has the beneficial effects that:

Drawings

The invention will be further described with reference to the accompanying drawings.

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

FIG. 2 is a schematic view of the overall cross-sectional structure of the present invention;

FIG. 3 is a schematic view of the support ring structure of the present invention;

FIG. 4 is a schematic view of the overall structure of the outer tub of the present invention;

FIG. 5 is a schematic view of the overall structure of the inner cylinder according to the present invention;

FIG. 6 is a schematic view of the overall structure of the crushing box of the present invention;

FIG. 7 is a schematic view of the entire structure of the rotating mechanism of the present invention;

FIG. 8 is a schematic view of the overall structure of the first support table of the present invention.

In the figure: 1. a first support table; 2. a crushing mechanism; 3. a screening mechanism; 4. a feed hopper; 5. a first bracket; 6. a second support table; 7. a rotating mechanism; 8. a support ring; 9. a collection box; 11. a first connection station; 12. a third support table; 13. a chute; 14. a guide groove; 15. an empty avoiding groove; 16. a placement groove; 21. a cylinder; 22. fixing the pin; 23. crushing the box body; 24. a crushing roller; 25. a first motor; 31. an outer cylinder; 32. an inner barrel; 33. a toothed ring; 34. a helical blade; 61. an installation table; 62. fixing grooves; 71. a second motor; 72. a fixed mount; 73. a first fluted disc; 74. a first rotating shaft; 75. a bearing; 76. a shock pad; 77. a second rotating shaft; 78. a second fluted disc; 81. a material guide chute; 82. a discharging barrel; 83. a discharge chute; 231. a first support plate; 232. a connecting frame; 233. a second support plate; 234. screening holes I; 235. a crushing tank; 311. a supporting circular table; 312. a discharge port; 321. and (5) screening holes II.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

Referring to fig. 1-8, a high-efficiency sand sieving machine for producing concrete comprises a first supporting table 1, a crushing mechanism 2, a sieving mechanism 3, a feeding funnel 4, a first support 5, a second supporting table 6, a rotating mechanism 7, a supporting ring 8 and a collecting box 9, the top of one side of the first supporting platform 1 is provided with a crushing mechanism 2, the top of the other side of the first supporting platform 1 is connected with a second supporting platform 6, a collecting box 9 is arranged at the bottom of the other side of the first supporting platform 1, a rotating mechanism 7 is arranged in the middle of the top of the second supporting platform 6, the rotating mechanism 7 is connected with the screening mechanism 3, one side of the top of the second supporting platform 6 is provided with a supporting ring 8, screening mechanism 3 one end joint is in supporting the ring 8, the welding of 6 top opposite sides of second brace table has two first supports 5, two feed hopper 4 is installed in the cooperation of first support 5 top.

The crushing mechanism 2 comprises two air cylinders 21, the two air cylinders 21 are fixedly arranged at the top of the third supporting table 12, the two air cylinders 21 are symmetrically distributed about the transverse central line of the first supporting table 1, piston rods of the air cylinders 21 penetrate through the first connecting table 11 and are arranged on the connecting frame 232 through fixing pins 22, the piston rods are guided to move through the first connecting table 11 so as to avoid deviation in the moving process, a crushing groove 235 is formed in the top of the crushing box body 23, a plurality of first sieve holes 234 are formed in the bottom of the crushing groove 235, the sieve holes 234 are distributed in a matrix shape, a first supporting plate 231 is arranged on one side, close to the air cylinders 21, of the crushing box body 23, the connecting frame 232 is welded to the top of the first supporting plate 231, a second supporting plate 233 is arranged on the other side of the crushing box body 23, two first motors 25 are fixedly arranged at the top of the second supporting plate 233, and the, the two crushing rollers 24 are rotatably arranged in the crushing grooves 235, sliding bosses are arranged on two sides of the bottom of the crushing box body 23 and are slidably arranged in the sliding grooves 13, so that the crushing box body 23 is prevented from shifting in the process of moving back and forth; drive broken box 23 at 1 top round trip movement of first supporting station through setting up cylinder 21 for the screening speed of broken box 23 sets up two crushing roller 24 of relative motion simultaneously in broken groove 235, rolls the breakage to the sand material of big granule, improves resource utilization and rates, saves the cost.

A third supporting table 12 is arranged on one side of the first supporting table 1, two first connecting tables 11 are arranged on the top of the first supporting table 1, the two first connecting tables 11 are symmetrically distributed about the transverse center line of the first supporting table 1, two sliding grooves 13 are arranged on the top of the first supporting table 1, the two sliding grooves 13 are symmetrically distributed about the transverse center line of the first supporting table 1, the two first connecting tables 11 are positioned between the two sliding grooves 13, a guide groove 14 is arranged on the top of the first supporting table 1, the guide groove 14 is positioned between the two sliding grooves 13, the bottom surface of the guide groove 14 is inclined downwards so as to facilitate the conveying of sand materials, an empty avoiding groove 15 is arranged in the middle of the top of the first supporting table 1, the empty avoiding groove 15 is positioned on one side of the guide groove 14 far away from the first connecting table 11, a placing groove 16 is arranged on the bottom of the other side of the first supporting table 1, and the empty avoiding groove 15 is communicated with the placing groove 16, the collecting box 9 is placed in the placing groove 16.

The top of the second supporting table 6 is of a slope structure, an installation table 61 is arranged on one side, low in the top, of the second supporting table 6, and a fixing groove 62 is formed in the middle of the installation table 61.

The rotating mechanism 7 comprises eight fixing frames 72, every two of the eight fixing frames 72 are divided into a group, four groups of fixing frames 72 are fixedly installed at the top of the second supporting table 6 through bolts, the four groups of fixing frames 72 are symmetrically distributed about the transverse center line of the second supporting table 6, shock-absorbing pads 76 are respectively arranged between the four groups of fixing frames 72 and the second supporting table 6, the shock-absorbing pads 76 are rubber shock-absorbing pads and used for reducing the vibration generated by the rotation of the sieving mechanism 3, bearings 75 are respectively installed inside the top ends of the eight fixing frames 72, a first rotating shaft 74 is installed on the two groups of fixing frames 72 on the front side in a matched and rotating mode, a second rotating shaft 77 is installed on the two groups of fixing frames 72 on the rear side in a rotating mode, two gear discs 78 are installed in the middle of the two second rotating shafts 77, two gear discs 73 are installed on the first rotating, one end of the first rotating shaft 74, which is far away from the mounting table 61, is connected with a second motor 71, and the second motor 71 is fixedly mounted at the top of the second support table 6; the outer cylinder 31 is driven to rotate by arranging the first toothed disc 73 and the second toothed disc 78, and the outer cylinder 31 is enabled to rotate more stably by meshing the first toothed disc 73 and the second toothed disc 78 with the toothed ring 33.

The screening mechanism 3 comprises an outer cylinder 31, two mounting bosses are arranged on the outer side shaft surface of the outer cylinder 31, a toothed ring 33 is fixedly mounted on one side of each mounting boss through a bolt, a supporting circular truncated cone 311 is arranged at one end of the outer cylinder 31, two discharge holes 312 are formed in one end of the outer cylinder 31, which is provided with the supporting circular truncated cone 311, the two discharge holes 312 are symmetrically distributed about the axis of the outer cylinder 31, the two discharge holes 312 are located on the outer side of the supporting circular truncated cone 311, the outer cylinder 31 is connected to a first toothed disc 73 and a second toothed disc 78 of the rotating mechanism 7 through the toothed ring 33, the toothed ring 33 is meshed and connected with the first toothed disc 73 and the second toothed disc 78, an inner cylinder 32 is mounted inside the outer cylinder 31, two groups of helical blades 34 are fixedly mounted inside the inner cylinder 32, the two groups of helical blades 34 are arranged, the aperture of the second sieve pore 321 is consistent with the aperture of the first sieve pore 234; through the screening of pivoted urceolus 31, inner tube 32 and helical blade 34 to the sand material, add long sand material motion stroke, can fully screen the sand material, improve the efficiency of screening simultaneously.

The bottom of the supporting ring 8 is fixedly connected with a discharging barrel 82, a guide chute 81 is formed in the supporting ring 8, a discharging chute 83 is formed in the discharging barrel 82, the guide chute 81 is communicated with the discharging chute 83, the supporting ring 8 is welded on the mounting table 61, one end of the outer barrel 31 is sleeved in the supporting ring 8, and the discharging port 312 corresponds to the position of the guide chute 81, so that screened sand materials are conveyed out from the discharging port 312 in the rotating process conveniently, the supporting ring 8 is matched with the outer barrel 31 to avoid the sand materials from scattering, the discharging barrel 82 is fixedly installed in the fixing groove 62, and the bottom end of the discharging barrel 82 penetrates through the empty avoiding groove 15 and extends to the upper part of the collecting box 9; the supporting ring 8 is connected with the discharging barrel 82 at an angle.

The working steps of the high-efficiency sand screening machine for producing concrete are as follows:

firstly, sand is poured into a feeding funnel 4, the sand enters an inner cylinder 32 of a screening mechanism 3 through the feeding funnel 4, a second motor 71 is started to drive a first rotating shaft 74 to rotate, the first rotating shaft 74 drives a first fluted disc 73 to rotate, the first fluted disc 73 drives an outer cylinder 31 and a second fluted disc 78 to rotate, the outer cylinder 31 drives the inner cylinder 32 to rotate, the sand is screened through a helical blade 34 and a second sieve mesh 321 in the inner cylinder 32, the sand with the size smaller than the second sieve mesh 321 enters a region between the inner cylinder 32 and the outer cylinder 31 through the second sieve mesh 321, and falls into a guide chute 81 from a discharge port 312 along with the rotation of the outer cylinder 31, and then enters a collecting box 9 through a discharge chute 83;

step two, the sand material that the size is greater than two 321 apertures of sieve mesh rotates through inner tube 32, drop to crushing groove 235, start two first motors 25 simultaneously, and make two crushing rollers 24 rotate in opposite directions, roll the breakage to the sand material in crushing groove 235, simultaneously in crushing process, start cylinder 21, promote broken box 23 round trip movement on first supporting station 1, make the sand material after the breakage pass through sieve mesh one 234 screening, drop to guide slot 14, finally the landing is to the collection box 9, after the screening is finished, take out collection box 9, carry the sand material in the collection box 9 to next process.

The working principle of the invention is as follows:

the sand material is poured into the feeding funnel 4, the sand material enters the inner cylinder 32 of the screening mechanism 3 through the feeding funnel 4, the second motor 71 is started to drive the first rotating shaft 74 to rotate, the first rotating shaft 74 drives the first fluted disc 73 to rotate, the first fluted disc 73 drives the outer cylinder 31 and the second fluted disc 78 to rotate, the outer cylinder 31 drives the inner cylinder 32 to rotate, the sand material is screened through the helical blades 34 and the second sieve holes 321 in the inner cylinder 32, the sand material with the size smaller than the second sieve hole 321 enters the area between the inner cylinder 32 and the outer cylinder 31 through the second sieve holes 321, the sand material falls into the guide chute 81 from the discharge port 312 along with the rotation of the outer cylinder 31, and then enters the collection box 9 through the discharge chute 83; through setting up rotatory urceolus 31 and inner tube 32 to set up helical blade 34 and set up sieve mesh two 321 in inner tube 32, make sand material increase the motion distance at the in-process of screening, the effectual screening effect that has improved has increased screening efficiency, carries out abundant screening to sand material, avoids the resource loss too much.

In the screening process of the screening mechanism 3, sand materials with the size larger than the second 321 pore diameter of the sieve pores drop into the crushing groove 235 through the rotation of the inner cylinder 32, the two first motors 25 are started simultaneously, the two crushing rollers 24 rotate oppositely to crush and crush the sand materials in the crushing groove 235, meanwhile, in the crushing process, the air cylinder 21 is started to push the crushing box body 23 to move back and forth on the first supporting table 1, so that the crushed sand materials are screened through the first sieve pore 234, drop into the guide groove 14 and finally slide into the collecting box 9, after the screening is finished, the collecting box 9 is taken out, and the sand materials in the collecting box 9 are conveyed to the next working procedure; the cylinder 21 is arranged to drive the crushing box body 23 to move back and forth on the top of the first supporting table 1, so that the screening speed of the crushing box body 23 is increased, and meanwhile, two crushing rollers 24 which move in opposite directions are arranged in the crushing groove 235 to roll and crush large-particle sand materials, so that the resource utilization rate is improved, and the cost is saved; and screening and crushing are carried out simultaneously, so that the time is saved, and the working efficiency is improved.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims

1. A high-efficiency sand screening machine for producing concrete comprises a first supporting platform (1), a crushing mechanism (2), a screening mechanism (3), a feeding hopper (4), a first support (5), a second supporting platform (6), a rotating mechanism (7), a supporting ring (8) and a collecting box (9), and is characterized in that the crushing mechanism (2) is installed at the top of one side of the first supporting platform (1), the second supporting platform (6) is connected to the top of the other side of the first supporting platform (1), the collecting box (9) is placed at the bottom of the other side of the first supporting platform (1), the rotating mechanism (7) is arranged in the middle of the top of the second supporting platform (6), the rotating mechanism (7) is connected with the screening mechanism (3), the supporting ring (8) is arranged at one side of the top of the second supporting platform (6), one end of the screening mechanism (3) is clamped in the supporting ring (8), the other side of the top of the second support table (6) is welded with two first supports (5), and the tops of the two first supports (5) are provided with a feeding hopper (4) in a matching way;

the crushing mechanism (2) comprises two cylinders (21), the two cylinders (21) are fixedly arranged at the top of a third supporting table (12), the two cylinders (21) are symmetrically distributed about the transverse center line of a first supporting table (1), piston rods of the cylinders (21) penetrate through a first connecting table (11) and are arranged on a connecting frame (232) through fixing pins (22), a crushing groove (235) is formed in the top of a crushing box body (23), a plurality of first sieve holes (234) are formed in the bottom of the crushing groove (235), the plurality of first sieve holes (234) are distributed in a matrix form, a first supporting plate (231) is arranged on one side, close to the cylinders (21), of the crushing box body (23), the connecting frame (232) is welded to the top of the first supporting plate (231), a second supporting plate (233) is arranged on the other side of the crushing box body (23), and two first motors (25) are fixedly arranged on the top of the second supporting plate (, the output shafts of the two first motors (25) are connected with two crushing rollers (24), the two crushing rollers (24) are rotatably installed in the crushing groove (235), sliding bosses are arranged on two sides of the bottom of the crushing box body (23), and the sliding bosses are slidably installed in the sliding groove (13).

2. The high-efficiency sand screening machine for producing concrete according to claim 1, wherein a third supporting table (12) is arranged on one side of the first supporting table (1), two first connecting tables (11) are arranged on the top of the first supporting table (1), the two first connecting tables (11) are symmetrically distributed about the transverse center line of the first supporting table (1), two sliding grooves (13) are arranged on the top of the first supporting table (1), the two sliding grooves (13) are symmetrically distributed about the transverse center line of the first supporting table (1), the two first connecting tables (11) are positioned between the two sliding grooves (13), a guide groove (14) is formed in the top of the first supporting table (1), the guide groove (14) is positioned between the two sliding grooves (13), and an empty avoiding groove (15) is formed in the middle of the top of the first supporting table (1), the empty avoiding groove (15) is located on one side, away from the first connecting table (11), of the guide groove (14), a placing groove (16) is formed in the bottom of the other side of the first supporting table (1), the empty avoiding groove (15) is communicated with the placing groove (16), and the collecting box (9) is placed in the placing groove (16).

3. The high-efficiency sand screening machine for producing concrete according to claim 1, wherein the top of the second support platform (6) is in a slope structure, an installation platform (61) is arranged on one side of the second support platform (6) at the lower part, and a fixing groove (62) is formed in the middle of the installation platform (61).

4. The high-efficiency sand screening machine for producing concrete according to claim 1, wherein the rotating mechanism (7) comprises eight fixed frames (72), every two of the eight fixed frames (72) are divided into one group, four groups of fixed frames (72) are fixedly installed at the top of the second supporting platform (6) through bolts, the four groups of fixed frames (72) are symmetrically distributed about the transverse center line of the second supporting platform (6), shock absorption pads (76) are padded between the four groups of fixed frames (72) and the second supporting platform (6), bearings (75) are installed inside the top ends of the eight fixed frames (72), a first rotating shaft (74) is installed in the two groups of fixed frames (72) on the front side in a matching and rotating mode, a second rotating shaft (77) is installed in the two groups of fixed frames (72) on the rear side in a rotating mode, and a second fluted disc (78) is installed in the middle of the two second rotating shafts (77), two first fluted discs (73) are installed to first axis of rotation (74), and two first fluted disc (73) are located first axis of rotation (74) both ends, the one end that installation platform (61) was kept away from in first axis of rotation (74) is connected with second motor (71), second motor (71) fixed mounting is at second brace table (6) top.

5. The efficient sand screening machine for producing concrete according to claim 1, wherein the screening mechanism (3) comprises an outer barrel (31), two mounting bosses are arranged on the outer shaft surface of the outer barrel (31), a toothed ring (33) is fixedly mounted on one side of the mounting bosses through bolts, a supporting circular truncated cone (311) is arranged at one end of the outer barrel (31), two discharge ports (312) are formed at one end of the outer barrel (31), the two discharge ports (312) are located on the outer side of the supporting circular truncated cone (311), the outer barrel (31) is connected to a first toothed disc (73) and a second toothed disc (78) of the rotating mechanism (7) through the toothed ring (33), the toothed ring (33) is meshed with the first toothed disc (73) and the second toothed disc (78), an inner barrel (32) is mounted inside the outer barrel (31), and two sets of helical blades (34) are fixedly mounted inside the inner barrel (32), the two groups of spiral blades (34) are arranged in a staggered mode, the wall of the inner barrel (32) is provided with a plurality of second sieve holes (321), and the plurality of second sieve holes (321) are distributed in an array mode.

6. The efficient sand screening machine for producing concrete according to claim 1, wherein a discharge chute (82) is fixedly connected to the bottom of the support ring (8), a guide chute (81) is formed inside the support ring (8), a discharge chute (83) is arranged inside the discharge chute (82), the guide chute (81) is communicated with the discharge chute (83), the support ring (8) is welded on the mounting table (61), one end of the outer cylinder (31) is sleeved in the support ring (8), the position of the discharge port (312) corresponds to the position of the guide chute (81), the discharge cylinder (82) is fixedly installed in the fixing groove (62), and the bottom end of the discharge cylinder (82) penetrates through the clearance groove (15) and extends to the position above the collection box (9).

7. The working method of the high-efficiency sand screening machine for producing concrete is characterized by comprising the following working steps of:

step one, sand is poured into a feeding funnel (4), the sand enters an inner cylinder (32) of a screening mechanism (3) through the feeding funnel (4), a second motor (71) is started to drive a first rotating shaft (74) to rotate, the first rotating shaft (74) drives a first fluted disc (73) to rotate, the first fluted disc (73) drives an outer cylinder (31) and a second fluted disc (78) to rotate, the outer cylinder (31) drives the inner cylinder (32) to rotate, the sand is screened through a spiral blade (34) and a second sieve mesh (321) in the inner cylinder (32), the sand with the size smaller than the aperture of the second sieve mesh (321) enters an area between the inner cylinder (32) and the outer cylinder (31) through the second sieve mesh (321), falls into a guide chute (81) from a discharge hole (312) along with the rotation of the outer cylinder (31), and then enters a collection box (9) through the discharge chute (83);

step two, the size is greater than the sand material in sieve mesh two (321) aperture, rotate through inner tube (32), drop to broken groove (235), start two first motors (25) simultaneously, and make two crushing roller (24) rotate in opposite directions, grind the breakage to the sand material in broken groove (235), simultaneously in crushing process, start cylinder (21), promote broken box (23) round trip movement on first supporting station (1), make the sand material after the breakage sieve mesh one (234) sieve, drop to in guide slot (14), finally the landing is to collection case (9), after the screening, take out collecting case (9), carry the sand material in collecting case (9) to next process.