Sand screening device applied to building engineering

Abstract

The application discloses a sand screening device applied to building engineering and relates to the field of sand screening of building engineering, which comprises a side plate, the inner wall of the side plate is provided with a screening mechanism, the inner wall of the side plate is rotationally connected with multiple groups of rotating rollers, and the top end of the multiple groups of rotating rollers is slidably connected with a collecting box. The sand screening device can drive the lower vibrating screen and the upper vibrating screen to simultaneously sort sand in the sand screening process through a power mechanism, so that the sand can be sorted in multiple stages and collected and stored respectively during screening, the sand screening work efficiency is improved, the sand screening device does not need to replace the screen mesh for secondary screening during sand screening, the sand screening work efficiency is improved, the rotating shaft is driven to move up and down through the No. 2 sliding frame during sand screening, so that the sand can be intermittently placed on the upper vibrating screen during sand screening, so that the sand on the upper vibrating screen is always maintained within a reasonable range, and the sand on the upper vibrating screen is prevented from being too much and causing the sand to be blocked on the upper vibrating screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sand screening for construction engineering, and particularly to a sand screening device for construction engineering. BACKGROUND

[0002] Sand can be divided into river sand, sea sand and mountain sand according to its source. Mountain sand has rough surface, many angular particles, high sand content and high content of organic impurities, and has poor quality. Sea sand and river sand have smooth surface, but sea sand has high salt content, which has certain influence on concrete and mortar. River sand is relatively clean and is widely used. In the process of construction, the coarser the sand, the more difficult it is to prepare pumped concrete. Therefore, a certain amount of fine particle content needs to be ensured. In order to ensure the working performance, the sand rate needs to be increased. The increase of sand rate can increase the strength of concrete. The finer the sand, the worse the gradation, which leads to the discontinuity of concrete gradation and reduces the strength of concrete. The cement dosage also needs to be increased, which increases the hydration heat and is not conducive to saving and crack resistance. When mixing concrete with fine sand, sometimes the concrete mixture has large cohesiveness, poor fluidity, viscosity or poor cohesiveness, and the mortar cannot fill the pores between the aggregates and appears to be stratified and segregated. It is difficult to vibrate and compact. In order to prepare the required concrete mortar, sand, one of the concrete materials, needs to be screened. Sand with different fineness also becomes a factor affecting the quality of the prepared concrete. Therefore, sand needs to be screened before the production of concrete, which can guarantee the quality of concrete as much as possible and improve the engineering quality of construction engineering.

[0003] During use, due to the large size and heavy weight of the sand screening machine, it is difficult to move. Workers have to place the sand screening machine far away from the construction area to reduce the movement of the sand screening machine. However, such arrangement makes workers have to transport the screened sand back and forth during construction, which increases the labor intensity of workers and reduces the efficiency of construction site construction.

[0004] The existing patent (publication number: CN110404759A) is a sand screening device for construction engineering which is convenient to move and transport, comprising a base frame, a hopper fixedly arranged at the upper end of the base frame, a rolling screen cylinder rotatably arranged on the base frame, and a conveying assembly for transporting finished fine sand. The discharge end of the hopper extends into the feed end of the rolling screen cylinder. The conveying assembly is installed below the rolling screen cylinder. The disassembly and assembly between the sand screening mechanism and the moving mechanism are convenient and fast. When the sand screening mechanism is installed on the moving mechanism, the sand screening device is convenient and fast to move and transport. The finished fine sand screened out of the rolling screen cylinder slides onto two sand conveying plates under the action of the sand guide plate, so that the finished fine sand can be conveyed to the opposite sides of the base frame at the same time, which facilitates the simultaneous sand conveying to two sand conveying vehicles, thereby improving the working efficiency of the sand screening device.

[0005] For the above problems, the existing patent gives a solution, which is convenient and fast to disassemble and assemble between the sand screening mechanism and the moving mechanism. The finished fine sand slides down to two sand conveying plates under the action of the sand guide plate, so that the finished fine sand can be conveyed to the opposite sides of the base frame at the same time, thereby improving the working efficiency of the sand screening device. However, in the existing patent, dust mixed in the sand will be scattered into the air during the sand screening process, causing air pollution and affecting the health of workers near the sand screening device. SUMMARY

[0006] Therefore, the present application aims to provide a sand screening device applied to construction engineering to solve the technical problems raised in the above background.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a sand screening device applied to construction engineering, comprising a side plate, the inner wall of the side plate is provided with a screening mechanism, the inner wall of the side plate is rotatably connected with a plurality of rotating rollers, the top end of the plurality of rotating rollers is slidably connected with a collection box, the inner wall of the side plate is fixedly connected with two groups of wear-resistant plates, the top end of the side plate is fixedly connected with two groups of power mechanisms, the top end of the side plate is fixedly connected with a discharging mechanism beside the power mechanism, and the side wall of the side plate is communicated with two groups of dust removal mechanisms.

[0008] As a preferred technical scheme of the present application, the screening mechanism comprises a lower vibrating screen, a first supporting rod, an upper vibrating screen, a second supporting rod, a rotating rod, a first top rod and a second top rod, the inner wall of the side plate is rotatably connected with the lower vibrating screen, the top end of the lower vibrating screen is fixedly connected with two groups of first supporting rods, the inner wall of the side plate is rotatably connected with the upper vibrating screen above the lower vibrating screen, and the bottom end of the upper vibrating screen is fixedly connected with two groups of second supporting rods.

[0009] As a preferred technical scheme of the present application, the side wall of the side plate is rotatably connected with two groups of rotating rods, the rotating rod comprises a rotating arm, a first sliding frame and a second sliding frame, the side wall of the side plate is rotatably connected with two groups of rotating arms, one end of each of the two groups of rotating arms is fixedly connected with a group of first sliding frames, and the other end of each of the two groups of rotating arms is fixedly connected with a group of second sliding frames.

[0010] As a preferred technical scheme of the present application, the inner wall of the first sliding frame is slidably connected with a first top rod, the first top rod is fixedly connected to the top end of the first supporting rod, the inner wall of the second sliding frame is slidably connected with a second top rod, and the second top rod is fixedly connected to the bottom end of the second supporting rod.

[0011] As a preferred technical scheme of the present application, the power mechanism comprises a box, a motor, a No. 3 sliding frame, an eccentric wheel, a pressing rod, a pushing frame, a No. 1 sliding column and a No. 1 connecting rod, the top end of the side plate is fixedly connected with two groups of boxes, the side walls of the two groups of boxes are respectively fixedly connected with a group of motors extending into the box, the inner walls of the two groups of boxes are respectively slidably connected with a group of No. 3 sliding frames, the output end of the motor is fixedly connected with an eccentric wheel located in the box, and the eccentric wheel is slidably connected to the inner wall of the No. 3 sliding frame.

[0012] As a preferred technical scheme of the present application, the bottom end of the No. 3 sliding frame is fixedly connected with a pressing rod extending to the outside of the box, one end of the pressing rod located outside the box is fixedly connected with a pushing frame, the inner wall of the pushing frame is slidably connected with a No. 1 sliding column, one end of the No. 1 sliding column is fixedly connected with one end of a No. 1 connecting rod, and the other end of the No. 1 connecting rod is fixedly connected to the top end of the rotating arm.

[0013] As a preferred technical scheme of the present application, the blanking mechanism comprises a shell, a sliding groove, a No. 2 sliding column, a flap, a rotating shaft and a pull rod, the top end of the side plate is fixedly connected with a shell, the inner wall of the shell is provided with two groups of sliding grooves, the inner parts of the two groups of sliding grooves are respectively slidably connected with a group of No. 2 sliding columns, and the outer walls of the two groups of No. 2 sliding columns are respectively fixedly connected with a group of flaps.

[0014] As a preferred technical scheme of the present application, the two groups of flaps are rotatably connected with a group of rotating shafts extending to the outside of the shell, the two ends of the rotating shaft are respectively rotatably connected with a group of pull rods located outside the shell, and the ends of the two groups of pull rods away from the rotating shaft are respectively rotatably connected to the ends of a group of No. 2 ejector rods.

[0015] As a preferred technical scheme of the present application, the other ends of the two groups of No. 2 connecting rods in front of the side plate are respectively fixedly connected to the top ends of a group of No. 1 sliding frames, and the other ends of the two groups of No. 2 connecting rods at the back of the side plate are respectively fixedly connected to the bottom ends of a group of No. 2 sliding frames.

[0016] In summary, the present application mainly has the following beneficial effects:

[0017] 1. The dust removal mechanism is designed, the gas cover, the air bag, the No. 2 connecting rod, the filter bag, the No. 1 one-way valve and the No. 2 one-way valve in the dust removal mechanism are matched with each other, the air bag is sucked by the up-down vibration of the lower vibrating screen and the upper vibrating screen during sand screening, the dust flying in the sand during screening is sucked and collected, the dust flying to the outside of the sand screening device during sand screening is reduced, the workers inhale a large amount of dust, and the health of the workers is protected.

[0018] 2. The application designs the discharging mechanism, utilizes the mutual cooperation of the box, motor, No. 3 sliding frame, eccentric wheel, pressing rod, pushing frame, No. 1 sliding column and No. 1 connecting rod in the discharging mechanism, drives the rotating shaft to move up and down through the No. 2 sliding frame in the sand screening process, so that the sand can be intermittently put on the upper vibrating screen in the sand screening process, so that the sand on the upper vibrating screen is always maintained within a reasonable range, so as to prevent the sand on the upper vibrating screen from being too much and causing the sand to be blocked on the upper vibrating screen.

[0019] 3. The application designs the screening mechanism, utilizes the mutual cooperation of the lower vibrating screen, No. 1 supporting rod, upper vibrating screen, No. 2 supporting rod, rotating rod, rotating arm, No. 1 sliding frame, No. 2 sliding frame, No. 1 ejector rod and No. 2 ejector rod in the screening mechanism, drives the lower vibrating screen and the upper vibrating screen to sort sand at the same time through the power mechanism in the sand screening process, so that the sand can be sorted in multiple stages and collected and stored respectively when screening, so that the screen mesh does not need to be replaced for secondary screening when screening sand, and the work efficiency of the sand screening work is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a side view structure schematic diagram of the application;

[0021] Figure 2 It is an enlarged structure schematic diagram of A of the application;

[0022] Figure 3 It is a front view structure schematic diagram of the application;

[0023] Figure 4 It is a right view structure schematic diagram of the application;

[0024] Figure 5 It is a rear view structure schematic diagram of the application;

[0025] Figure 6 It is a box internal structure schematic diagram of the application;

[0026] Figure 7 It is a dust removal mechanism cross-section structure schematic diagram of the application;

[0027] Figure 8 It is a shell cross-section structure schematic diagram of the application.

[0028] In the figure: 1, side plate; 2, screening mechanism; 3, rotating roller; 4, collection box; 5, wear plate; 6, power mechanism; 7, discharging mechanism; 8, dust removal mechanism;

[0029] 201, lower vibrating screen; 202, first supporting rod; 203, upper vibrating screen; 204, second supporting rod; 205, rotating rod; 2051, rotating arm; 2052, first sliding frame; 2053, second sliding frame; 206, first ejector rod; 207, second ejector rod;

[0030] 601, box body; 602, motor; 603, third sliding frame; 604, eccentric wheel; 605, pressing rod; 606, pushing frame; 607, first sliding column; 608, first connecting rod;

[0031] 701, outer shell; 702, sliding groove; 703, second sliding column; 704, flap; 705, rotating shaft; 706, pull rod;

[0032] 801, gas collecting cover; 802, air bag; 803, second connecting rod; 804, filter bag; 805, first one-way valve; 806, second one-way valve. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0034] The embodiments of the present application will be described below according to the overall structure of the present application.

[0035] A sand screening device applied to building engineering, as shown in the accompanying drawings, Figures 1-8As shown, including side plate 1, the inner wall of side plate 1 is provided with screening mechanism 2, the inner wall of side plate 1 is rotatably connected with a plurality of groups of rotating rollers 3, the top end of the plurality of groups of rotating rollers 3 is slidably connected with a collection box 4, the inner wall of side plate 1 is fixedly connected with two groups of wear-resistant plates 5, the top end of side plate 1 is fixedly connected with two groups of power mechanisms 6, the top end of side plate 1 is fixedly connected with a discharging mechanism 7 beside the power mechanism 6, the side wall of side plate 1 is communicated with two groups of dust removal mechanisms 8, the screening mechanism 2 includes a lower vibrating screen 201, a first supporting rod 202, an upper vibrating screen 203, a second supporting rod 204, a rotating rod 205, a first top rod 206 and a second top rod 207, the inner wall of side plate 1 is rotatably connected with lower vibrating screen 201, the top end of lower vibrating screen 201 is fixedly connected with two groups of first supporting rods 202, the inner wall of side plate 1 is rotatably connected with upper vibrating screen 203 above lower vibrating screen 201, the bottom end of upper vibrating screen 203 is fixedly connected with two groups of second supporting rods 204, the side wall of side plate 1 is rotatably connected with two groups of rotating rods 205, rotating rod 205 includes a rotating arm 2051, a first sliding frame 2052 and a second sliding frame 2053, the side wall of side plate 1 is rotatably connected with two groups of rotating arms 2051, one end of the two groups of rotating arms 2051 is respectively fixedly connected with a group of first sliding frames 2052, the other end of the two groups of rotating arms 2051 is respectively fixedly connected with a group of second sliding frames 2053, the inner wall of first sliding frame 2052 is slidably connected with first top rod 206, first top rod 206 is fixedly connected at the top end of first supporting rod 202, the inner wall of second sliding frame 2053 is slidably connected with second top rod 207, second top rod 207 is fixedly connected at the bottom end of second supporting rod 204, power mechanism 6 includes a box body 601, a motor 602, a third sliding frame 603, an eccentric wheel 604, a pressing rod 605, a pushing frame 606, a first sliding column 607 and a first connecting rod 608, the top end of side plate 1 is fixedly connected with two groups of box bodies 601, the side wall of the two groups of box bodies 601 is respectively fixedly connected with a group of motors 602 extending into the box body 601, the inner wall of the two groups of box bodies 601 is respectively slidably connected with a group of third sliding frames 603, the output end of motor 602 is fixedly connected with eccentric wheel 604 located in the box body 601, eccentric wheel 604 is slidably connected with the inner wall of third sliding frame 603, the bottom end of third sliding frame 603 is fixedly connected with pressing rod 605 extending to the outside of box body 601, one end of pressing rod 605 located outside the box body 601 is fixedly connected with pushing frame 606, the inner wall of pushing frame 606 is slidably connected with first sliding column 607, one end of first sliding column 607 is fixedly connected with one end of first connecting rod 608, the other end of first connecting rod 608 is fixedly connected with the top end of rotating arm 2051.

[0036] The two groups of eccentric wheels 604 are driven to rotate by the two groups of motors 602, so that the two groups of eccentric wheels 604 respectively push the two groups of third sliding frames 603 to slide up and down inside the box body 601. In the process of the third sliding frame 603 sliding up and down, the two groups of pressing rods 605 are respectively driven to slide up and down, the two groups of pushing rods are respectively driven to slide up and down by the two groups of pressing rods 605, the two groups of first sliding columns 607 are respectively driven to move up and down by the two groups of pushing rods, the two groups of first connecting rods 608 are respectively driven to move up and down by the two groups of first sliding columns 607, the rotating arm 2051 is driven to reciprocatingly rotate in the process of the first connecting rod 608 moving up and down, the first sliding frame 2052 and the second sliding frame 2053 are driven to reciprocatingly turn over in the process of the rotating arm 2051 reciprocatingly rotating, the first supporting rod 202 is driven to move up and down by the first top rod 206 through the first sliding frame 2052, so that the lower vibrating screen is driven to turn over up and down, the second supporting rod 204 is driven to move up and down by the second top rod 207 through the second sliding frame 2053, so that the upper vibrating screen 203 is driven to turn over up and down, so that the lower vibrating screen 201 and the upper vibrating screen 203 can be driven by the power mechanism 6 to sort sand at the same time in the process of screening sand, so that the sand can be sorted in multiple stages and collected and stored respectively when screening, so that the screen mesh does not need to be replaced for secondary screening when screening sand, and the work efficiency of the sand screening work is improved.

[0037] Please refer to Figures 1-8 The blanking mechanism 7 comprises an outer shell 701, a sliding groove 702, a second sliding column 703, a flap 704, a rotating shaft 705 and a pull rod 706. The top end of the side plate 1 is fixedly connected with the outer shell 701. The inner wall of the outer shell 701 is provided with two groups of sliding grooves 702. The inner part of the two groups of sliding grooves 702 is respectively slidably connected with a group of second sliding columns 703. The outer wall of the two groups of second sliding columns 703 is respectively fixedly connected with a group of flaps 704. The two groups of flaps 704 are rotatably connected with a group of rotating shafts 705 extending to the outside of the outer shell 701. The two ends of the rotating shaft 705 are respectively rotatably connected with a group of pull rods 706 located outside the outer shell 701. The ends away from the rotating shaft 705 of the two groups of pull rods 706 are respectively rotatably connected with the ends of a group of second top rods 207.

[0038] In the above process, the second ejector rod 207 moves up and down, and the pull rod 706 drives the shaft 705 to move up and down. When the shaft 705 moves up, the shaft 705 drives the two sets of flaps 704, so that the two flaps 704 drive the two sets of second sliding columns 703 to slide up in the sliding groove 702. At this time, the two sets of second sliding rods slide along the sliding groove 702 and approach each other, so that the sand above the flaps 704 falls from the two sides of the two flaps 704. When the shaft 705 moves down, the shaft 705 pushes the two sets of flaps 704, so that the two sets of flaps 704 push the two sets of second sliding columns 703 to slide down in the sliding groove 702, so that the two sets of second sliding columns 703 move away from each other. At this time, the two sets of flaps 704 are driven to open by the second sliding column 703, so as to block the sand above the flaps 704 and prevent the sand from falling onto the upper vibrating screen 203. In the process of screening sand, the shaft 705 is driven to move up and down by the second sliding frame 2053, so as to intermittently put sand onto the upper vibrating screen 203 during the screening process, so as to maintain the sand on the upper vibrating screen within a reasonable range, thereby preventing the sand on the upper vibrating screen 203 from being too much and causing the sand to be blocked on the upper vibrating screen.

[0039] Please refer to Figures 1-8 The dust removal mechanism 8 includes a gas collecting hood 801, a gas bag 802, a second connecting rod 803, a filter bag 804, a first one-way valve 805, and a second one-way valve 806. The side wall of the side plate 1 is communicated with two sets of gas collecting hoods 801. The side wall of each set of gas collecting hoods 801 is communicated with a gas bag 802. The outer wall of each set of gas bags 802 is fixedly connected with one end of a second connecting rod 803. The other end of each set of second connecting rods 803 in front of the side plate 1 is fixedly connected to the top end of a first sliding frame 2052. The other end of each set of second connecting rods 803 at the back of the side plate 1 is fixedly connected to the bottom end of a second sliding frame 2053.

[0040] In the process of driving the first sliding frame 2052 and the second sliding frame 2053 by the rotating arm 2051, the first sliding frame 2052 and the second sliding frame 2053 move up and down to drive the two groups of air bags 802 through the second connecting rod 803, when the rotating arm 2051 rotates clockwise, the first sliding frame 2052 is driven to overturn downward, and the second sliding frame 2053 is driven to overturn upward, at this time, the first sliding frame 2052 and the second sliding frame 2053 drive the two groups of air bags 802 to expand, so that negative pressure is generated in the air bag 802, at this time, the first one-way valve 805 opens to suck the dust in the side plate 1 into the air bag 802, and when the rotating arm 2051 rotates counterclockwise, the first sliding frame 2052 and the second sliding frame 2053 drive the two groups of air bags 802 to reset, so that the pressure in the two groups of air bags 802 becomes larger, at this time, the air in the air bag 802 drives the dust to push away the second one-way valve 806, so that the dust enters the filter bag 804 and is filtered down, so that when sand screening is performed, the air bag 802 can be driven to suck by the up and down vibration of the lower vibrating screen 201 and the upper vibrating screen 203, so that the dust flying in the sand screening process is sucked and collected, so that when sand screening is performed, the dust flying to the outside of the sand screening device can be reduced, the workers are prevented from inhaling a large amount of dust, and the health of the workers is protected.

[0041] When in use, the two groups of eccentric wheels 604 are driven to rotate by the two groups of motors 602, so that the two groups of eccentric wheels 604 respectively push the two groups of third sliding frames 603 to slide up and down in the box body 601, the third sliding frames 603 slide up and down to respectively drive the two groups of pressing rods 605 to slide up and down, the two groups of pressing rods 605 respectively drive the two groups of pushing rods to slide up and down, the two groups of pushing rods respectively drive the two groups of first sliding columns 607 to move up and down, so that the two groups of first sliding columns 607 respectively drive the two groups of first connecting rods 608 to move up and down, the first connecting rods 608 move up and down to drive the rotating arm 2051 to reciprocate, the rotating arm 2051 reciprocates to drive the first sliding frame 2052 and the second sliding frame 2053 to reciprocate, the first sliding frame 2052 drives the first supporting rod 202 to move up and down through the first jacking rod 206, so as to drive the lower rotating screen to overturn up and down, the second sliding frame 2053 drives the second supporting rod 204 to move up and down through the second jacking rod 207, so as to drive the upper vibrating screen 203 to overturn up and down, so that the lower vibrating screen 201 and the upper vibrating screen 203 can be driven to sort sand by the power mechanism 6 at the same time in the sand screening process, so that the sand can be sorted in multiple stages and collected and stored respectively when screening, so that the screen mesh does not need to be replaced for secondary screening when sand screening, and the work efficiency of sand screening work is improved.

[0042] Although the embodiments of the present application have been shown and described, the specific embodiments are merely exemplary and are not to be construed as limiting the present application, and the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner, and those skilled in the art can make modifications, replacements and variations to the embodiments without creative contribution after reading the specification, and as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A sand screening device for use in construction engineering, comprising a side plate (1), characterized in that: The inner wall of the side plate (1) is provided with a screening mechanism (2), and the inner wall of the side plate (1) is rotatably connected with multiple sets of rotating rollers (3). The top of the multiple sets of rotating rollers (3) is slidably connected with a collection box (4). The inner wall of the side plate (1) is fixedly connected with two sets of anti-wear plates (5). The top of the side plate (1) is fixedly connected with two sets of power mechanisms (6). The top of the side plate (1) is fixedly connected with a feeding mechanism (7) located next to the power mechanism (6). The side wall of the side plate (1) is connected to two sets of dust removal mechanisms (8). The screening mechanism (2) includes a lower vibrating screen (201), a first support rod (202), an upper vibrating screen (203), a second support rod (204), a rotating rod (205), a first top rod (206), and a second top rod (207). The lower vibrating screen (201) is rotatably connected to the inner wall of the side plate (1). Two sets of first support rods (202) are fixedly connected to the top of the lower vibrating screen (201). The upper vibrating screen (203) located above the lower vibrating screen (201) is rotatably connected to the inner wall of the side plate (1). Two sets of second support rods (204) are fixedly connected to the bottom of the upper vibrating screen (203). The side wall of the side plate (1) is rotatably connected to two sets of rotating rods (205). The rotating rods (205) include rotating arms (2051), a first sliding frame (2052) and a second sliding frame (2053). The side wall of the side plate (1) is rotatably connected to two sets of rotating arms (2051). One end of each set of rotating arms (2051) is fixedly connected to a first sliding frame (2052), and the other end of each set of rotating arms (2051) is fixedly connected to a second sliding frame (2053). The inner wall of the first sliding frame (2052) is slidably connected to a first top rod (206), and the first top rod (206) is fixedly connected to the top end of the first support rod (202). The inner wall of the second sliding frame (2053) is slidably connected to a second top rod (207), and the second top rod (207) is fixedly connected to the bottom end of the second support rod (204). The feeding mechanism (7) includes a housing (701), a chute (702), a second sliding column (703), a flap (704), a rotating shaft (705), and a pull rod (706). The top of the side plate (1) is fixedly connected to the housing (701). The inner wall of the housing (701) is provided with two sets of chute (702). The interior of each of the two sets of chute (702) is slidably connected to a set of second sliding columns (703). The outer walls of each of the two sets of second sliding columns (703) are fixedly connected to a set of flaps (704). A set of rotating shafts (705) extending to the outside of the outer shell (701) are rotatably connected between the two sets of flaps (704). A set of pull rods (706) located outside the outer shell (701) are rotatably connected to both ends of the rotating shafts (705). The ends of the two sets of pull rods (706) away from the rotating shafts (705) are rotatably connected to the ends of a set of second top rods (207).

2. The sand screening device for construction engineering according to claim 1, characterized in that: The power mechanism (6) includes a housing (601), a motor (602), a third sliding frame (603), an eccentric wheel (604), a pressure rod (605), a push frame (606), a first sliding column (607), and a first connecting rod (608). Two sets of housings (601) are fixedly connected to the top of the side plate (1). A set of motors (602) extending into the housing (601) is fixedly connected to the side walls of the two sets of housings (601). A set of third sliding frames (603) is slidably connected to the inner walls of the two sets of housings (601). An eccentric wheel (604) located in the housing (601) is fixedly connected to the output end of the motor (602). The eccentric wheel (604) is slidably connected to the inner wall of the third sliding frame (603).

3. A sand screening device for construction engineering according to claim 2, characterized in that: The bottom end of the third sliding frame (603) is fixedly connected to a pressure rod (605) extending to the outside of the box (601). The end of the pressure rod (605) located outside the box (601) is fixedly connected to a push frame (606). The inner wall of the push frame (606) is slidably connected to a first sliding column (607). One end of the first sliding column (607) is fixedly connected to one end of a first connecting rod (608). The other end of the first connecting rod (608) is fixedly connected to the top of the rotating arm (2051).

4. A sand screening device for construction engineering according to claim 1, characterized in that: The dust removal mechanism (8) includes a gas collection hood (801), an air bag (802), a second connecting rod (803), a filter bag (804), a first one-way valve (805), and a second one-way valve (806). The side wall of the side plate (1) is connected to two sets of gas collection hoods (801). The side walls of the two sets of gas collection hoods (801) are respectively connected to a set of air bags (802). The outer walls of the two sets of air bags (802) are respectively fixedly connected to one end of the two sets of second connecting rods (803).

5. A sand screening device for construction engineering according to claim 4, characterized in that: The other ends of the two sets of No. 2 connecting rods (803) in front of the side plate (1) are respectively fixedly connected to the top of a set of No. 1 sliding frames (2052), and the other ends of the two sets of No. 2 connecting rods (803) behind the side plate (1) are respectively fixedly connected to the bottom of a set of No. 2 sliding frames (2053).

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