CN117000579A

CN117000579A - A sand and gravel screening device for concrete preparation

Info

Publication number: CN117000579A
Application number: CN202311282774.3A
Authority: CN
Inventors: 闫兴海; 习友冬; 王硕; 赵彤昕; 杨寿玉; 王娟娟
Original assignee: Henan Lvzhu Concrete Co ltd
Current assignee: Henan Lvzhu Concrete Co ltd
Priority date: 2023-10-07
Filing date: 2023-10-07
Publication date: 2023-11-07
Anticipated expiration: 2043-10-07
Also published as: CN117000579B

Abstract

The application provides a screening device for preparing sand and stone materials from concrete, and belongs to the technical field of sand and stone screening. A concrete preparation gravel material screening device comprising: an equipment rack; a feed frame; the middle screen roller is rotatably arranged on the equipment rack; a discharge cylinder fixed on the equipment rack; the spiral lifting rod is arranged in the feeding frame and the middle screen roller; the first thread blade is fixedly connected between the spiral lifting rod and the inner side wall of the middle screen roller; the fine screen roller is rotationally connected with the equipment rack; the first receiving hopper is used for receiving materials obtained through screening by the fine screening roller; a second receiving hopper for receiving the material after screening by the fine screen drum; the second thread blade is fixedly connected between the inner side wall of the fine screen roller and the outer side wall of the middle screen roller. The application can solve the problems that the conventional sand screening equipment can not thoroughly screen sand materials and the screening grids are easy to block.

Description

Screening plant for sand and stone materials prepared from concrete

Technical Field

The application relates to the technical field of sand and stone screening, in particular to a sand and stone material screening device for concrete preparation.

Background

Concrete is a common building material and is prepared by using sand and stone as aggregate. The sand and stone materials are usually screened to remove impurities and undesirable particles therefrom, ensuring that the concrete produced has a certain strength and quality.

Traditional grit material screening plant mainly adopts the screen cloth to sieve, through mechanical vibration or the effect of rivers, separates the grit material according to different sizes. However, conventional screening devices have problems such as easy clogging of screens, low screening efficiency, large equipment footprints, etc.

Meanwhile, refer to the Chinese patent with publication number CN109499872B, which discloses a sand screening device for construction engineering, and adopts a mode of multiple screening to realize the separation of screening materials.

Disclosure of Invention

In order to solve part or all of the technical problems, the application provides a screening device for preparing sand and stone materials from concrete, which has the technical advantages that a screen is not easy to block and sand and stone materials are fully separated.

A concrete preparation sand screening plant comprising: the equipment rack is vertically arranged on a horizontal plane; the feeding frame is fixed on the equipment rack; the middle screen roller is rotatably arranged on the equipment frame, the inside of the feeding frame is communicated with the inside of the middle screen roller, and the middle screen roller is obliquely upwards arranged from the feeding frame; the discharging cylinder is fixed on the equipment rack, and the inside of the discharging cylinder is communicated with one end, far away from the feeding frame, of the middle screen roller; the spiral lifting rod is arranged in the feeding frame and the middle screen roller along the inclined direction of the middle screen roller, and two ends of the spiral lifting rod are both in rotary connection with the equipment rack; the first thread blade is fixedly connected between the spiral lifting rod and the inner side wall of the middle screen roller; the rotating source is fixedly arranged on the equipment rack and used for driving the spiral lifting rod to rotate; the fine screen roller is sleeved at one end, close to the feeding frame, of the middle screen roller, and two ends of the fine screen roller are rotatably connected with the equipment frame; the first receiving hopper is fixedly connected to the equipment rack and is used for receiving materials obtained by screening by the fine screen roller; the second receiving hopper is fixedly connected to the equipment rack and used for receiving the materials screened by the fine screening roller; the second thread blade is fixedly connected between the inner side wall of the fine screen roller and the outer side wall of the middle screen roller; wherein, the sieve pore aperture of well sieve cylinder lateral wall is greater than the sieve pore aperture of fine screen cylinder lateral wall.

By adopting the technical scheme, the screening operation of the sand and stone materials is realized, wherein the screening operation comprises primary screening of a middle screen roller and secondary screening of a fine screen roller. Through the rotation effect of the rotation source to the spiral lifting rod, the first thread blade, the middle screen roller, the second thread blade and the fine screen roller are further driven to synchronously rotate.

Under the rotary motion of the middle screen roller, the rolling mixing of the sand and stones is realized, sand and stones with the specification and the size smaller than the aperture of the sieve holes in the middle screen roller pass through the middle screen roller and drop into the fine screen roller, and the preliminary screening of the sand and stones is realized. Simultaneously, under the rotary motion of spiral lifting rod, first screw thread blade carries out the synchronous lifting motion of grit material, separates the discharge through a play feed cylinder to the grit material of accomplishing screening operation. And similarly, the rotary motion of the fine screening roller realizes the secondary screening of the sand and stone materials. And separating and discharging the sand and stone materials screened by the fine screen drum through a first receiving hopper. The second screw thread blade rotates to realize that the sand and stone materials after screening are separated and discharged through the second receiving hopper.

Through the arrangement, the screening operation of the device on the sand and stone materials is realized. The rotation of the middle screen roller and the fine screen roller completes the screening operation of the sand and stone materials; and the spiral lifting rod, the first thread blade and the second thread blade rotate to finish separation and discharge of sand and stones. The roller type screening operation mode is adopted, and the treatment volume and screening efficiency of sand and stone materials are improved. The spiral lifting rod, the first thread blade and the second thread blade are designed to finish synchronous screening and lifting operation, so that the utilization efficiency of equipment is improved, and the performance waste caused by independently designing a lifting mechanism is avoided.

Optionally, prismatic sieve holes are formed in the walls of the middle sieve roller and the fine sieve roller, the second thread blades are consistent with the fine sieve roller in length, and the length of the fine sieve roller is smaller than that of the middle sieve roller.

By adopting the technical scheme, the rotary drum with the diamond screening grids is not easy to block holes, and the operation efficiency is improved. The bottom plate of fine screen cylinder is set up, realizes the separation to the grit material, when avoiding the integrated design, partial grit material drops from the bottom plate, causes the leak of grit material.

Optionally, the feeding frame includes: the feeding hopper is fixedly arranged on the lower end face of the equipment rack; the silo, the silo with feeder hopper fixed connection, the silo with the lower terminal surface sliding butt of well sieve cylinder, the silo with the centre of a circle line of well sieve cylinder is on same axis, first screw thread blade with the inside wall sliding butt of silo.

Through adopting above-mentioned technical scheme, design and the silo of first screw blade slip butt, be convenient for collect the constraint of grit material, solve the grit material and pile up the feeding jam that causes at the feeding frame, optimize operating efficiency.

Optionally, a concrete preparation grit material screening plant still includes: the dust separation cover is fixedly sleeved on the equipment frame; the air pipe is fixedly arranged on the equipment rack and penetrates through the dust-separation cover; the discharging cylinder is fixedly arranged at the upper end of one side surface of the equipment rack, the discharging cylinder is in sliding connection with the upper end surface of the middle screen roller, and the outlet direction of the discharging cylinder is inclined downwards.

By adopting the technical scheme, the dust-separating cover realizes the separation of dust in the screening operation process. And the air pipe is used for collecting dust in the dust-proof cover.

Optionally, a concrete preparation grit material screening plant still includes: the knocking roller is arranged on the equipment rack; the tapping roller includes: the driving shaft is rotatably installed on the equipment rack, is parallel to the fine screen roller and has the same length; the utility model discloses a sieve, including the sieve cylinder, the sieve cylinder is provided with the sieve cylinder, the sieve rod is provided with a plurality ofly, a plurality of the sieve rod is spiral equidistance distribution setting in on the drive shaft, the sieve rod with sieve cylinder intermittent type butt.

Through adopting above-mentioned technical scheme, the drive shaft is rotatory, drives the mode that the beating pole carried out intermittent type nature collision butt to the fine screen cylinder, shakes the clearance operation to the grit material of card on screening net.

Optionally, a concrete preparation grit material screening plant still includes: the energy storage separation rod is fixedly arranged on the equipment rack, and the distance between the energy storage separation rod and the driving shaft is smaller than the length of the beating rod.

Through adopting above-mentioned technical scheme, design energy storage separation pole is used for promoting the relative speed when beating pole and fine screen cylinder intermittent type nature collision butt, promotes cleaning efficiency.

Optionally, a concrete preparation grit material screening plant still includes: the guide rollers are arranged on the equipment rack and used for rotating and supporting the middle screen roller and the fine screen roller.

Optionally, the guide roller further comprises a first guide wheel and a second guide wheel; the first guide wheel is abutted against the upper end face of the fine screen roller, and the first guide wheel is fixedly connected with the upper end face of the driving shaft; the second guide wheel is abutted against the lower end face of the fine screen roller, and the second guide wheel is fixedly connected with the lower end face of the driving shaft.

By adopting the technical scheme, the operation linkage between the knocking roller and the fine screen roller is realized, and the transmission mode is optimized.

Optionally, the rotation source is connected with the spiral lifting rod in a transmission way through a driving chain, and the rotation source is a driving motor.

In summary, compared with the prior art, the application has the beneficial technical effects that the sand and stone screening device for concrete preparation comprises at least one of the following components:

1. the design mode that drum-type screening structure and spiral lifting structure combined is adopted, screening and lifting operation's combination is realized, and the waste that peripheral hardware lifting mechanism caused is avoided.

2. And the drum-type screening structure of the upward movement is designed, so that the screening efficiency is improved. The defect that the traditional downstream screening motion structure is not thorough in screening and the parallel vibration type screening structure is low in operation efficiency is overcome, and the repeated screening operation on sand and stones can be synchronously completed.

3. The first thread blade and the second thread blade are designed to conduct lifting movement on the sand and stones in screening. Realize screening and promote going on in step, improve the operating efficiency, accomplish the separation discharge of screening sand and stones.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. The elements or portions thereof are not necessarily drawn to scale:

FIG. 1 is a schematic diagram of the structure of the present application;

FIG. 2 is a cross-sectional view of the present patent;

FIG. 3 is a schematic view of the structure of the screening and lifting mechanism of the present application;

FIG. 4 is a cross-sectional view of the present application patent highlighting a screening lifting mechanism;

FIG. 5 is a cross-sectional view of the present application patent highlighting the fine screen drum and the second threaded vane;

fig. 6 is a schematic view of the structure of the application in which the striking roller and the energy storage blocking rod are mounted on the stand of the projecting display device.

Reference numerals illustrate: 1. an equipment rack; 2. a feed frame; 3. a middle screen roller; 4. a discharging cylinder; 5. a spiral lifting rod; 6. a first thread blade; 7. a rotating source; 8. a fine screen roller; 9. a second threaded vane; 11. a first receiving hopper; 12. a second receiving hopper; 21. a feed hopper; 22. a silo; 31. a dust-proof cover; 32. an air duct; 40. knocking the roller; 41. a drive shaft; 42. beating the rod; 43. an energy storage blocking rod; 51. a guide roller; 52. a first guide wheel; 53. and a second guide wheel.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to fig. 1 to 6 of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present patent. All other embodiments, based on the described embodiments of the present application, which are available to one of ordinary skill in the art, are within the scope of the present application.

The embodiment of the application discloses a sand and stone screening device for concrete preparation.

Referring to fig. 1 to 5, a screening device for preparing sand and stone materials from concrete comprises a device frame 1, wherein a feeding frame 2 for adding sand and stone materials is fixedly arranged on the lower end face of the device frame 1, and sand and stone materials added from the feeding frame 2 are screened and separated.

The structure setting of screening, separation treatment includes: the middle screen roller 3 arranged on the equipment frame 1 is rotated, the inside of the feeding frame 2 is communicated with the inside of the middle screen roller 3, and the middle screen roller 3 is obliquely upwards arranged from the feeding frame 2. Spiral lifting rods 5 are arranged in the feeding frame 2 and the middle screen roller 3 along the inclined direction of the middle screen roller 3, and two ends of each spiral lifting rod 5 are rotatably connected with the equipment rack 1. A first screw blade 6 fixedly connected between the spiral lifting rod 5 and the inner side wall of the middle screen drum 3. The fine screen roller 8 is sleeved on one end of the middle screen roller 3 close to the feeding frame 2, and two ends of the fine screen roller 8 are rotatably connected with the equipment frame 1. And a second thread blade 9 fixedly connected between the inner side wall of the fine screen roller 8 and the outer side wall of the middle screen roller 3. Wherein, the sieve pore aperture of the side wall of the middle sieve roller 3 is larger than the sieve pore aperture of the side wall of the fine sieve roller 8.

A first receiving hopper 11 fixedly connected to the equipment rack 1 is used for receiving the materials obtained by screening through the fine screen roller 8. A second receiving hopper 12 fixedly connected to the equipment rack 1 for receiving the material after screening by the fine screen drum 8. And the discharging cylinder 4 is fixed on the equipment frame 1, and the inside of the discharging cylinder 4 is communicated with one end, far away from the feeding frame 2, of the inside of the middle screen roller 3. The discharging cylinder 4 is fixedly arranged at the upper end of one side surface of the equipment rack 1, the discharging cylinder 4 is in sliding connection with the upper end surface of the middle screen roller 3, and the outlet direction of the discharging cylinder 4 is inclined downwards. A rotation source 7 fixedly installed on the equipment rack 1 is used for driving the spiral lifting rod 5 to rotate through a driving chain.

The spiral lifting rod 5 is fixedly connected with the first thread blade 6, the middle screen roller 3, the second thread blade 9 and the fine screen roller 8 in sequence, so that the integral rotation design of screening operation is realized. The rotation source 7 is connected with the spiral lifting rod 5 through a driving chain, and then the structure is driven to rotate.

The operation principle of screening and separating treatment comprises: the sand added from the feed box 2 enters the mid-screen drum 3. Under the rotary motion of the middle screen roller 3, the rolling mixing of sand and stones is realized, sand and stones with the specification and size smaller than the aperture of the middle screen holes in the middle screen roller 3 pass through the middle screen roller 3 and drop into the fine screen roller 8, and the preliminary screening operation of the sand and stones is realized. Simultaneously, under the rotary motion of the spiral lifting rod 5, the first thread blade 6 carries out synchronous lifting motion of sand and stone materials, and sand and stone materials which finish screening operation are separated and discharged through the discharging cylinder 4. Similarly, the rotary motion of the fine screen roller 8 realizes the secondary screening operation of the sand and stone materials falling into the fine screen roller 8. Sand and stone materials falling from the sieve pore diameter of the fine sieve drum 8 are separated and discharged through the first receiving hopper 11. The second screw blade 9 rotates to realize the lifting motion of the sand and stone materials after screening and is separated and discharged through the second receiving hopper 12.

Through the operation, the secondary screening of the sand and stone materials is realized. Wherein, after screening, the materials remained after the screening operation are referred to; screening to obtain materials which are screened and fall off in the screening process

Wherein, set up prismatic sieve mesh on the section of thick bamboo wall of well sieve cylinder 3 and fine screen cylinder 8, second screw thread blade 9 is unanimous with the length of fine screen cylinder 8, and the length of fine screen cylinder 8 is less than the length of well sieve cylinder 3.

Referring to fig. 1 and 2, the feed frame 2 includes a feed hopper 21 and a silo 22. The feed hopper 21 is fixedly provided on the lower end face of the equipment rack 1. The silo 22 is fixedly connected with the feed hopper 21, the silo 22 is in sliding abutting connection with the lower end face of the middle screen roller 3, the silo 22 and the circular axis of the middle screen roller 3 are on the same axis, and the first thread blade 6 is in sliding abutting connection with the inner side wall of the silo 22.

The added sand enters the silo 22 from the hopper 21. Sand and stone materials are lifted and conveyed into the middle screen roller 3 through the first screw thread blades 6 by the screw lifting rods 5 arranged in the silo 22 for screening the sand and stone materials.

Referring to fig. 1 and 2, a dust-proof cover 31 is fixedly sleeved on the equipment rack 1, and the dust-proof cover 31 is used for dust isolation. An air pipe 32 is fixedly arranged on the equipment frame 1, an air inlet of the air pipe 32 is arranged in the dust-proof cover 31, an air outlet of the air pipe 32 is arranged on the outer side of the dust-proof cover 31, and the air pipe 32 is connected with dust removing equipment and used for dust treatment. The first receiving hopper 11 and the second receiving hopper 12 pass through the dust-separating hood 31.

Referring to fig. 2 and 6, a knocking roller 40 is provided on the equipment rack 1 in the dust cover 31. The tapping roller 40 includes: a driving shaft 41, and a tapping rod 42 provided on the driving shaft 41. The beating rods 42 are arranged in a spiral equidistant distribution with the driving shaft 41 as the center of a circle. The driving shaft 41 rotates to act on the intermittent collision abutting of the beating rod 42 on the fine screen roller 8, so that the vibration cleaning of the sand and stone clamped on the screen is realized.

Referring to fig. 6, an energy storage blocking lever 43 is fixedly provided on the equipment rack 1. The energy storage blocking lever 43 is spaced from the driving shaft 41 by a distance less than the length of the flapping lever 42.

The energy storage blocking rod 43 is arranged in front of intermittent abutting of the beating rod 42 and the fine screen roller 8, and the energy storage blocking rod 43 is used for restraining deformation of the beating rod 42 and improving relative speed when the beating rod 42 collides and abuts against the fine screen roller 8. The cleaning efficiency of the tapping roller 40 is improved.

Referring to fig. 1 and 6, the equipment rack 1 is provided with a plurality of guide rollers 51, and the plurality of guide rollers 51 are used for rotatably supporting the middle screen drum 3 and the fine screen drum 8.

Wherein, referring to fig. 6, the guide roller 51 further includes a first guide wheel 52 and a second guide wheel 53; the first guide wheel 52 is abutted against the upper end surface of the fine screen roller 8, and the first guide wheel 52 is fixedly connected with the upper end surface of the driving shaft 41; the second guide wheel 53 abuts against the lower end face of the fine screen drum 8, and the second guide wheel 53 is fixedly connected with the lower end face of the driving shaft 41. The fine screen roller 8 drives the first guide wheel 52 and the second guide wheel 53 to perform abutting movement, and the first guide wheel 52 and the second guide wheel 53 act on the rotation operation of the driving shaft 41, so that the cleaning operation of the beating rod 42 on the fine screen roller 8 is realized. Wherein, the abutting means synchronous movement with consistent linear velocity after abutting between round wheel structures.

Wherein, the first guide wheel 52 and the second guide wheel 53 are used for transmitting the rotation driving force of the fine screen roller 8 to the knocking roller 40. The adoption of the linked design mode facilitates the cleaning operation of the knocking roller 40.

The equipment rack 1 is provided with a rotation source 7, and the rotation source 7 is a driving motor. The rotation source 7 is in transmission connection with the spiral lifting rod 5 through a driving chain. Further, the spiral lifting rod 5 acts on the synchronous motion of the first thread blade 6, the middle screen roller 3, the second thread blade 9 and the fine screen roller 8, so that the purpose of screening operation is realized. Meanwhile, the fine screen roller 8 acts on the driving shaft 41 through the transmission of the first guide wheel 52 and the second guide wheel 53 to drive the beating rod 42 to rotate, so that the technical purpose of cleaning the fine screen roller 8 is achieved.

In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "vertical", "horizontal", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the term "A, B" and the like is used for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, the meaning of "plurality" is two or more unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A concrete preparation sand stone screening plant, characterized by comprising:

a device rack (1) which is erected on a horizontal plane;

the feeding frame (2) is fixed on the equipment rack (1);

the middle screen roller (3) is rotatably arranged on the equipment frame (1), the inside of the feeding frame (2) is communicated with the inside of the middle screen roller (3), and the middle screen roller (3) is obliquely upwards arranged from the feeding frame (2);

the discharging cylinder (4) is fixed on the equipment rack (1), and the inside of the discharging cylinder (4) is communicated with one end, far away from the feeding frame (2), of the inside of the middle screen roller (3);

the spiral lifting rod (5) is arranged in the feeding frame (2) and the middle screen roller (3) along the inclined direction of the middle screen roller (3), and two ends of the spiral lifting rod (5) are rotationally connected with the equipment frame (1);

the first thread blade (6) is fixedly connected between the spiral lifting rod (5) and the inner side wall of the middle screen roller (3);

the rotating source (7) is fixedly arranged on the equipment rack (1) and is used for driving the spiral lifting rod (5) to rotate;

the fine screen roller (8) is sleeved at one end, close to the feeding frame (2), of the middle screen roller (3), and two ends of the fine screen roller (8) are rotationally connected with the equipment frame (1);

the first receiving hopper (11) is fixedly connected to the equipment rack (1) and is used for receiving materials obtained by screening by the fine screening roller (8);

a second receiving hopper (12) fixedly connected to the equipment rack (1) and used for receiving the materials screened by the fine screening roller (8);

the second thread blade (9) is fixedly connected between the inner side wall of the fine screen roller (8) and the outer side wall of the middle screen roller (3);

wherein, the sieve pore aperture of the side wall of the middle screen roller (3) is larger than the sieve pore aperture of the side wall of the fine screen roller (8).

2. A concrete preparation sand screening plant according to claim 1, characterized in that: the middle screen roller (3) and the cylinder wall of the fine screen roller (8) are provided with prismatic sieve holes, the second thread blades (9) are consistent with the fine screen roller (8) in length, and the fine screen roller (8) is smaller than the middle screen roller (3) in length.

3. A concrete-making sand screening plant according to claim 1, characterized in that the feed frame (2) comprises:

the feeding hopper (21) is fixedly arranged on the lower end face of the equipment rack (1);

the silo (22), silo (22) with feeder hopper (21) fixed connection, silo (22) with the lower terminal surface sliding butt of well screen cylinder (3), silo (22) with the circle heart line of well screen cylinder (3) is on same axis, first screw blade (6) with the inside wall sliding butt of silo (22).

4. A concrete preparation sand screening plant according to claim 1, further comprising:

the dust-proof cover (31) is fixedly sleeved on the equipment frame (1);

the air pipe (32) is fixedly arranged on the equipment rack (1), and the air pipe (32) penetrates through the dust-proof cover (31);

the discharging cylinder (4) is fixedly arranged at the upper end of one side surface of the equipment rack (1), the discharging cylinder (4) is in sliding connection with the upper end surface of the middle screen roller (3), and the outlet direction of the discharging cylinder (4) is inclined downwards.

5. A concrete preparation sand screening plant according to claim 4, further comprising:

a knocking roller (40), wherein the knocking roller (40) is arranged on the equipment rack (1);

the tapping roller (40) includes:

-a drive shaft (41), said drive shaft (41) being rotatably mounted on said equipment rack (1), said drive shaft (41) being parallel and of equal length to said fine screen drum (8);

the plurality of the beating rods (42) are arranged on the driving shaft (41) in a spiral equidistant distribution mode, the beating rod (42) is intermittently abutted with the fine screen roller (8).

6. A concrete preparation sand screening plant according to claim 5, further comprising: the energy storage blocking rod (43), the energy storage blocking rod (43) is fixedly arranged on the equipment rack (1), and the distance between the energy storage blocking rod (43) and the driving shaft (41) is smaller than the length of the flapping rod (42).

7. A concrete preparation sand screening plant according to claim 5, further comprising: the guide rollers (51) are arranged in a plurality, the guide rollers (51) are arranged on the equipment rack (1), and the guide rollers (51) are used for rotating and supporting the middle screen roller (3) and the fine screen roller (8).

8. A concrete preparation sand screening plant according to claim 7, characterized in that: the guide roller (51) further comprises a first guide wheel (52) and a second guide wheel (53); the first guide wheel (52) is abutted against the upper end face of the fine screen roller (8), and the first guide wheel (52) is fixedly connected with the upper end face of the driving shaft (41); the second guide wheel (53) is abutted against the lower end face of the fine screen roller (8), and the second guide wheel (53) is fixedly connected with the lower end face of the driving shaft (41).

9. A concrete preparation sand screening plant according to claim 5, characterized in that: the rotating source (7) is in transmission connection with the spiral lifting rod (5) through a driving chain, and the rotating source (7) is a driving motor.