Sand screening device for building construction

Abstract

The sand screening device for building construction is composed of a first supporting frame, a second supporting frame, an auxiliary mechanism and a collecting mechanism, materials enter from an inlet guide groove, fine sand on a screen flows into a second sand containing box through a third guide plate, pebbles roll into a pebble collecting box from a first guide plate under the action of the gravity of the pebbles, and the pebbles are collected through a second sand containing box. In the process that stones roll on the surface of the first guide plate, part of fine sand adhering to the surfaces of the stones flows into the first sand containing box from the sand leaking holes, the situation that sand falls down along with the stones without being completely screened is avoided, the sand is collected in the second sand containing box through the guide effect of the second guide plate, the stones and the fine sand are conveniently separated and collected, and the sand screening efficiency is improved. Through the design of the auxiliary mechanism, stones are prevented from being clamped in the screen, the screening effect is improved, manual cleaning is avoided, the investment of human resources is saved, meanwhile, the auxiliary mechanism can conveniently collect the stones, time and labor are saved, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sand screening, and more particularly to a sand screening device for construction. Background Art

[0002] Some small sand screening devices are often used on construction sites, and the drum type is currently the most commonly used.

[0003] The utility model with the publication number CN212596972U provides a sand screening device for construction, which relates to the technical field of construction. The sand screening device for construction includes a screening box, the interior of the screening box is a hollow structure, the upper surface of the screening box is fixedly connected to a feed hopper connected to the interior, a mounting frame is arranged inside the screening box, the left and right sides of the mounting frame are fixedly connected to two plug-in rods, a rotating frame is arranged below the mounting frame, a screen is fixedly plugged inside the rotating frame, the right end of the rotating frame is hinged to the right end of the mounting frame, and the ends of the four plug-in rods that are away from each other slide through the left and right inner walls of the screening box respectively. The sand screening device for construction achieves the effect of sliding impurities on the screen when the left end of the rotating frame rotates downward by setting an extrusion spring, a clamping rod and a vertical spring, thereby solving the problem that the screened impurities accumulate more and more on the screen, which is inconvenient to clean, blocks the screen, and reduces the screening efficiency.

[0004] The above-mentioned sand screening device cannot effectively and completely separate sand and gravel, and the drum often causes sand and gravel to fall down together during rotation. Therefore, when the amount of sand is relatively large or the sand is relatively moist, it is easy for the sand to fall down with the gravel before being screened out. Since the gravel varies in size, it is easy to get stuck in the screen, resulting in a poor screening effect, and manual cleaning is required every once in a while. At the same time, some machines on the market use a horizontally placed gauze screen and then use vibration to fully separate the sand from the gravel. However, after separation, the gauze screen needs to be lifted out manually and the gravel is then dumped out. This is not only time-consuming and labor-intensive, but also reduces the working efficiency of the sand screening device. Summary of the invention

[0005] The present invention provides a sand screening device for construction, aiming to solve the above problems in the prior art.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] A sand screening device for construction consists of a first supporting frame, a second supporting frame, an auxiliary mechanism and a collecting mechanism.

[0008] Among them, a first motor is fixedly connected to the front of the first support frame, and the first motor is a forward and reverse motor. The outlet end of the first motor is fixedly connected to the first rotating shaft through a coupling. The first rotating shaft runs through the first support frame, and the first rotating shaft and the first support frame are rotatably connected together through a bearing. A second connecting plate is welded on the middle outer wall of the first rotating shaft. Starting the first motor can drive the first rotating shaft to rotate, and the rotation of the first rotating shaft drives the second connecting plate to rotate.

[0009] Among them, the second support frame is arranged above the first support frame, and a screen is arranged at the bottom of the second support frame. A support rod is fixedly connected to the middle part of the lower end of the screen, and the middle part of the lower end of the support rod is welded to the second connecting plate. The rotation of the second connecting plate drives the first support frame to rotate, and an inlet guide groove is arranged on one side wall of the second support frame, and an outlet guide groove is arranged on the other side wall of the second support frame. The material enters from the inlet guide groove, the fine sand is shaken off the screen and falls into the collecting mechanism, and the gravel rolls into the collecting mechanism from the outlet guide groove.

[0010] Among them, the auxiliary mechanism is fixedly connected to the second support frame. Through the design of the auxiliary mechanism, stones can be prevented from getting stuck in the screen, the screening effect is improved, manual cleaning is avoided, and human resource investment is saved. At the same time, the auxiliary mechanism can facilitate the collection of stones, save time and effort, and improve work efficiency.

[0011] The collecting mechanism is arranged below the second supporting frame, and the design of the collecting mechanism facilitates the collection of gravel and fine sand respectively.

[0012] As a preferred solution of the present invention, the front and back sides of the first support frame are rotatably connected to a pair of hollow tubes via bearings, the inner walls of the pair of hollow tubes are slidably connected to sliding plates, a rotating rod is welded to the back side of the sliding plate, and the other end of the rotating rod is rotatably connected to the second support frame via a bearing.

[0013] As a preferred solution of the present invention, the auxiliary mechanism includes a first support plate and a second support plate, a first slide groove is opened on the upper surface of the first support plate, a first slider is slidably connected in the first slide groove, a first fixed plate and a first track plate are welded to the upper end of the first slider, a second slide groove is opened on the front side of the first track plate, a first slide column is slidably connected in the second slide groove, and the first slide column is T-shaped.

[0014] As a preferred solution of the present invention, a first vertical plate is welded to the front side of the first support plate, a second motor is fixedly connected to the front side of the first vertical plate, an outlet end of the second motor is fixedly connected to a second rotating shaft via a coupling, the second rotating shaft passes through the first vertical plate, and the second rotating shaft and the first vertical plate are rotatably connected together via a bearing.

[0015] As a preferred solution of the present invention, a first rotating wheel is welded to the other end of the second rotating shaft, the back side of the first rotating wheel is welded to the first sliding column, a first F-shaped plate is slidably connected to the outer wall of the first rotating wheel, and the lower end of the first F-shaped plate is rotatably connected to the first fixed plate through a first T-shaped column.

[0016] As a preferred solution of the present invention, a third sliding groove is formed on the upper surface of the second support plate, a second slider is slidably connected in the third sliding groove, a second fixed plate and a second track plate are welded to the upper end of the second slider, a fourth sliding groove is formed on the front side of the second track plate, a second sliding column is slidably connected in the fourth sliding groove, a second rotating wheel is welded on the back side of the second sliding column, and the back side of the second rotating wheel is rotatably connected to the second vertical plate via a third rotating shaft.

[0017] As a preferred solution of the present invention, a second F-shaped plate is slidably connected to the outer wall of the second rotating wheel, the lower end of the second F-shaped plate is connected to the second fixed plate through a second T-shaped column, a first connecting plate is welded between the first F-shaped plate and the second F-shaped plate, and a scraper is arranged at the bottom of the first connecting plate.

[0018] As a preferred solution of the present invention, the collecting mechanism includes a first guide plate, a sand leakage hole is opened at the bottom of the first guide plate, a first sand box is welded to the lower end of the first guide plate, a second sand box is welded to the bottom of the first sand box, a third guide plate is welded to the upper end of the second sand box, a stone collection box is arranged on one side wall of the first guide plate, an inlet groove is opened on one side wall of the stone collection box, and a second guide plate is welded to the inner wall of the first sand box.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) The material enters from the inlet guide groove, and starting the first motor can drive the first rotating shaft to rotate. The rotation of the first rotating shaft drives the second connecting plate to rotate. Through the mutual cooperation between a pair of hollow tubes and the sliding plate, the first support frame is driven by the first motor to shake, thereby facilitating sand screening.

[0021] (2) The fine sand on the screen flows into the second sand box through the third guide plate, and the gravel rolls from the first guide plate into the gravel collection box under the action of its own gravity. When the gravel rolls on the surface of the first guide plate, some of the fine sand adhering to the surface of the gravel flows into the first sand box from the sand leakage holes, avoiding the situation where the sand falls with the gravel before being screened out. After being guided by the second guide plate, the sand is collected in the second sand box, which is convenient for the separate collection of gravel and fine sand.

[0022] (3) Start the second motor to drive the second shaft to rotate, and the rotation of the second shaft drives the first wheel to rotate. The first F-shaped plate is conveniently moved through the cooperation between the first slide groove and the first slider, between the second slide groove and the first slide column, and between the first F-shaped plate and the first wheel. The second F-shaped plate is conveniently moved through the cooperation between the third slide groove and the second slider, between the fourth slide groove and the second slide column, and between the second wheel and the second F-shaped plate. The movement of the first F-shaped plate and the second F-shaped plate drives the scraper to push the stone on the screen toward the outlet guide groove to avoid the stone being stuck in the screen, thereby improving the screening effect, avoiding manual cleaning, and saving investment in human resources. At the same time, the stone can be automatically collected, saving time and effort, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0025] Figure 3 It is a side view structural schematic diagram of the present invention;

[0026] Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement at point A;

[0027] Figure 5 It is a schematic diagram of the structure of the collection mechanism in an embodiment of the present invention;

[0028] Figure 6 Schematic diagram of the auxiliary mechanism structure in an embodiment of the present invention.

[0029] Description of the numbers in the figure:

[0030] 1. First support frame; 2. A pair of hollow tubes; 3. Sliding plate; 4. Rotating rod; 5. Second support frame; 6. Screen; 7. Auxiliary mechanism; 71. First support plate; 72. First slide groove; 73. First slider; 74. First fixed plate; 75. First track plate; 76. First vertical plate; 77. Second motor; 78. Second rotating shaft; 79. First rotating wheel; 710. First slide column; 711. Second slide groove; 712. First F-shaped plate; 713. First T-shaped column; 714. Second support plate; 715. Third slide groove; 716. Second slider; 717. Second fixed plate; 718. Second track plate ;719, second vertical plate;720, second rotating wheel;721, second sliding column;722, fourth sliding groove;723, second F-shaped plate;724, second T-shaped column;725, third rotating shaft;726, first connecting plate;727, scraper;8, collecting mechanism;81, stone collecting box;82, first guide plate;83, first sand containing box;84, second sand containing box;85, second guide plate;86, third guide plate;87, inlet groove;88, sand leakage hole;9, first motor;10, first rotating shaft;11, second connecting plate;12, supporting rod;13, inlet guide groove;14, outlet guide groove. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Example:

[0035] See also Figure 1-6 A sand screening device for construction is composed of a first support frame 1, a second support frame 5, an auxiliary mechanism 7 and a collecting mechanism 8.

[0036] Among them, a first motor 9 is fixedly connected to the front of the first support frame 1, and the first motor 9 is a forward and reverse motor. The outlet end of the first motor 9 is fixedly connected to a first rotating shaft 10 through a coupling. The first rotating shaft 10 runs through the first support frame 1, and the first rotating shaft 10 and the first support frame 1 are rotatably connected together through a bearing. A second connecting plate 11 is welded on the middle outer wall of the first rotating shaft 10. Starting the first motor 9 can drive the first rotating shaft 10 to rotate, and the rotation of the first rotating shaft 10 drives the second connecting plate 11 to rotate.

[0037] Among them, the second support frame 5 is arranged above the first support frame 1, and a screen 6 is arranged at the bottom of the second support frame 5. A support rod 12 is fixedly connected to the middle part of the lower end of the screen 6. The middle part of the lower end of the support rod 12 is welded to the second connecting plate 11. The rotation of the second connecting plate 11 drives the first support frame 1 to rotate. An inlet guide groove 13 is arranged on one side wall of the second support frame 5, and an outlet guide groove 14 is arranged on the other side wall of the second support frame 5. The material enters from the inlet guide groove 13, the fine sand is shaken off the screen 6 and falls into the collecting mechanism 8, and the gravel rolls into the collecting mechanism 8 from the outlet guide groove 14.

[0038] Among them, the auxiliary mechanism 7 is fixedly connected to the second support frame 5. Through the design of the auxiliary mechanism 7, stones can be prevented from being stuck in the screen 6, thereby improving the screening effect, avoiding manual cleaning, and saving human resource investment. At the same time, the auxiliary mechanism 7 can facilitate the collection of stones, save time and effort, and improve work efficiency.

[0039] The collecting mechanism 8 is arranged below the second supporting frame 5. The design of the collecting mechanism 8 facilitates the collection of gravel and fine sand.

[0040] Specifically, the front and back sides of the first support frame 1 are rotatably connected to a pair of hollow tubes 2 via bearings, a sliding plate 3 is slidably connected to the inner walls of the pair of hollow tubes 2, a rotating rod 4 is welded to the back side of the sliding plate 3, and the other end of the rotating rod 4 is rotatably connected to the second support frame 5 via a bearing.

[0041] In a further embodiment, through the cooperation between a pair of hollow tubes 2 and the sliding plate 3, the first support frame 1 is driven by the first motor 9 to shake, thereby facilitating sand screening.

[0042] Specifically, the auxiliary mechanism 7 includes a first support plate 71 and a second support plate 714. A first slide groove 72 is opened on the upper surface of the first support plate 71. A first slider 73 is slidably connected in the first slide groove 72. A first fixed plate 74 and a first track plate 75 are welded to the upper end of the first slider 73. A second slide groove 711 is opened on the front side of the first track plate 75. A first slide column 710 is slidably connected in the second slide groove 711. The first slide column 710 is T-shaped.

[0043] In a further embodiment, the first track plate 75 is facilitated to move in the horizontal direction by the mutual cooperation between the first slide groove 72 and the first slider 73, and the first slide column 710 is facilitated to move in the vertical direction by the mutual cooperation between the second slide groove 711 and the first slide column 710.

[0044] Specifically, a first vertical plate 76 is welded to the front of the first support plate 71, a second motor 77 is fixedly connected to the front of the first vertical plate 76, an outlet end of the second motor 77 is fixedly connected to a second rotating shaft 78 via a coupling, the second rotating shaft 78 passes through the first vertical plate 76, and the second rotating shaft 78 and the first vertical plate 76 are rotatably connected together via a bearing.

[0045] In a further embodiment, the first vertical plate 76 supports the second motor 77 , and the second motor 77 is a forward and reverse motor. The second motor 77 is started to drive the second rotating shaft 78 to rotate.

[0046] Specifically, a first rotating wheel 79 is welded to the other end of the second rotating shaft 78, the back of the first rotating wheel 79 is welded to the first sliding column 710, a first F-shaped plate 712 is slidably connected to the outer wall of the first rotating wheel 79, and the lower end of the first F-shaped plate 712 is rotatably connected to the first fixed plate 74 through a first T-shaped column 713.

[0047] In a further embodiment, the rotation of the second shaft 78 drives the first wheel 79 to rotate. The first wheel 79 is shaped like a triangle. The first slide column 710 and the second shaft 78 are respectively located at two corners of the first wheel 79. Through the mutual cooperation between the first F-shaped plate 712 and the first wheel 79, the rotation of the first wheel 79 drives the first F-shaped plate 712 to move.

[0048] Specifically, a third sliding groove 715 is opened on the upper surface of the second support plate 714, and a second slider 716 is slidably connected in the third sliding groove 715. A second fixed plate 717 and a second track plate 718 are welded to the upper end of the second slider 716. A fourth sliding groove 722 is opened on the front side of the second track plate 718, and a second slide column 721 is slidably connected in the fourth sliding groove 722. A second rotating wheel 720 is welded on the back side of the second sliding column 721, and the back side of the second rotating wheel 720 is rotatably connected to the second vertical plate 719 through a third rotating shaft 725.

[0049] In a further embodiment, through the mutual cooperation between the third slide groove 715 and the second slider 716, the second track plate 718 can be conveniently moved in the horizontal direction, and through the mutual cooperation between the fourth slide groove 722 and the second slide column 721, the second slide column 721 can be conveniently moved in the vertical direction. Through the design of the third rotating shaft 725 and the second vertical plate 719, the second rotating wheel 720 can be conveniently rotated.

[0050] Specifically, a second F-shaped plate 723 is slidably connected to the outer wall of the second rotating wheel 720, and the lower end of the second F-shaped plate 723 is connected to the second fixed plate 717 through a second T-shaped column 724. A first connecting plate 726 is welded between the first F-shaped plate 712 and the second F-shaped plate 723, and a scraper 727 is provided at the bottom of the first connecting plate 726.

[0051] In a further embodiment, the rotation of the second rotating wheel 720 drives the second F-shaped plate 723 to move. Under the connection of the first connecting plate 726, the movement of the first F-shaped plate 712 and the second F-shaped plate 723 drives the scraper 727 to push the stones on the screen 6 toward the outlet guide groove 14, thereby preventing the stones from getting stuck on the screen 6 and facilitating the collection of the stones.

[0052] Specifically, the collecting mechanism 8 includes a first guide plate 82, a sand leakage hole 88 is opened at the bottom of the first guide plate 82, a first sand box 83 is welded to the lower end of the first guide plate 82, a second sand box 84 is welded to the bottom of the first sand box 83, a third guide plate 86 is welded to the upper end of the second sand box 84, a stone collecting box 81 is arranged on one side wall of the first guide plate 82, an inlet groove 87 is opened on one side wall of the stone collecting box 81, and a second guide plate 85 is welded to the inner wall of the first sand box 83.

[0053] In a further embodiment, the third guide plate 86 is located directly below the screen 6, the first guide plate 82 is located directly below the outlet guide slot 14, and the first guide plate 82 is inclined toward the screen 6, the outlet end of the first guide plate 82 matches the inlet slot 87, the second guide plate 85 is arc-shaped, and the second guide plate 85 is bent toward the screen 6, the fine sand on the screen 6 flows into the second sand box 84 through the third guide plate 86, and the gravel rolls from the first guide plate 82 into the gravel collecting box 81 under the action of its own gravity. When the gravel rolls on the surface of the first guide plate 82, some of the fine sand adhered to the surface of the gravel flows into the first sand box 83 from the sand leakage hole 88, and is guided by the second guide plate 85 and gathered in the second sand box 84.

[0054] The working principle of this embodiment:

[0055] Starting the first motor 9 can drive the first rotating shaft 10 to rotate, and the rotation of the first rotating shaft 10 drives the second connecting plate 11 to rotate. Through the mutual cooperation between the pair of hollow tubes 2 and the sliding plate 3, the first supporting frame 1 is driven by the first motor 9 to shake, thereby facilitating the sand screening process;

[0056] The fine sand on the screen 6 flows into the second sand box 84 through the third guide plate 86, and the stones roll into the stone collection box 81 from the first guide plate 82 under the action of their own gravity. When the stones roll on the surface of the first guide plate 82, some of the fine sand adhering to the surface of the stones flows into the first sand box 83 from the sand leakage holes 88, and is guided by the second guide plate 85 and collected in the second sand box 84.

[0057] The second motor 77 is started to drive the second rotating shaft 78 to rotate. The rotation of the second rotating shaft 78 drives the first rotating wheel 79 to rotate. The first sliding groove 72 and the first sliding block 73 cooperate with each other, which facilitates the first track plate 75 to move in the horizontal direction. The second sliding groove 711 and the first sliding column 710 cooperate with each other, which facilitates the first sliding column 710 to move in the vertical direction. The first F-shaped plate 712 and the first rotating wheel 79 cooperate with each other, which facilitates the rotation of the first rotating wheel 79 to drive the first F-shaped plate 712 to move. The third sliding groove 715 and the second sliding block 716 cooperate with each other, which facilitates the first track plate 75 to move in the horizontal direction. The second track plate 718 moves in the horizontal direction, and the fourth slide groove 722 and the second slide column 721 cooperate with each other to facilitate the second slide column 721 to move in the vertical direction. The design of the third rotating shaft 725 and the second vertical plate 719 facilitates the second rotating wheel 720 to rotate. The rotation of the second rotating wheel 720 drives the second F-shaped plate 723 to move. Under the connection of the first connecting plate 726, the movement of the first F-shaped plate 712 and the second F-shaped plate 723 drives the scraper 727 on the screen 6 to push the stones toward the outlet guide groove 14, thereby avoiding the stones from being stuck on the screen 6 and facilitating the collection of the stones.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and improved concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A sand screening device for construction, characterized in that: include: A first support frame (1), a first motor (9) is fixedly connected to the front of the first support frame (1), an outlet end of the first motor (9) is fixedly connected to a first rotating shaft (10) via a coupling, the first rotating shaft (10) passes through the first support frame (1), and the first rotating shaft (10) and the first support frame (1) are rotatably connected together via a bearing, and a second connecting plate (11) is welded to the outer wall of the middle portion of the first rotating shaft (10); A second support frame (5) is arranged above the first support frame (1), a screen (6) is arranged at the bottom of the second support frame (5), a support rod (12) is fixedly connected to the middle part of the lower end of the screen (6), the middle part of the lower end of the support rod (12) is welded to the second connecting plate (11), an inlet guide groove (13) is arranged on one side wall of the second support frame (5), and an outlet guide groove (14) is arranged on the other side wall of the second support frame (5); An auxiliary mechanism (7) fixedly connected to the second support frame (5); The collecting mechanism (8) is arranged below the second supporting frame (5).

2. A sand screening device for construction according to claim 1, characterized in that: The front and back sides of the first support frame (1) are rotatably connected to a pair of hollow tubes (2) via bearings; a sliding plate (3) is slidably connected to the inner walls of the pair of hollow tubes (2); a rotating rod (4) is welded to the back side of the sliding plate (3); and the other end of the rotating rod (4) is rotatably connected to the second support frame (5) via a bearing.

3. A sand screening device for construction according to claim 1, characterized in that: The auxiliary mechanism (7) comprises a first support plate (71) and a second support plate (714), the upper surface of the first support plate (71) is provided with a first slide groove (72), a first slider (73) is slidably connected in the first slide groove (72), a first fixing plate (74) and a first track plate (75) are welded to the upper end of the first slider (73), a second slide groove (711) is provided on the front side of the first track plate (75), a first slide column (710) is slidably connected in the second slide groove (711), and the first slide column (710) is T-shaped.

4. A sand screening device for construction according to claim 3, characterized in that: A first vertical plate (76) is welded to the front side of the first support plate (71); a second motor (77) is fixedly connected to the front side of the first vertical plate (76); an outlet end of the second motor (77) is fixedly connected to a second rotating shaft (78) via a coupling; the second rotating shaft (78) passes through the first vertical plate (76); and the second rotating shaft (78) and the first vertical plate (76) are rotatably connected together via a bearing.

5. A sand screening device for construction according to claim 4, characterized in that: A first rotating wheel (79) is welded to the other end of the second rotating shaft (78), the back side of the first rotating wheel (79) is welded to the first sliding column (710), a first F-shaped plate (712) is slidably connected to the outer wall of the first rotating wheel (79), and the lower end of the first F-shaped plate (712) is rotatably connected to the first fixed plate (74) via a first T-shaped column (713).

6. A sand screening device for construction according to claim 3, characterized in that: A third slide groove (715) is provided on the upper surface of the second support plate (714), and a second slider (716) is slidably connected in the third slide groove (715), a second fixed plate (717) and a second track plate (718) are welded to the upper end of the second slider (716), a fourth slide groove (722) is provided on the front side of the second track plate (718), a second slide column (721) is slidably connected in the fourth slide groove (722), a second rotating wheel (720) is welded on the back side of the second rotating wheel (720), and the back side of the second rotating wheel (720) is rotatably connected to the second vertical plate (719) via a third rotating shaft (725).

7. A sand screening device for construction according to claim 6, characterized in that: A second F-shaped plate (723) is slidably connected to the outer wall of the second rotating wheel (720); the lower end of the second F-shaped plate (723) is connected to the second fixed plate (717) via a second T-shaped column (724); a first connecting plate (726) is welded between the first F-shaped plate (712) and the second F-shaped plate (723); a scraper (727) is provided at the bottom of the first connecting plate (726).

8. A sand screening device for construction according to claim 1, characterized in that: The collecting mechanism (8) comprises a first guide plate (82), a sand leakage hole (88) is provided at the bottom of the first guide plate (82), a first sand containing box (83) is welded to the lower end of the first guide plate (82), a second sand containing box (84) is welded to the bottom of the first sand containing box (83), a third guide plate (86) is welded to the upper end of the second sand containing box (84), a stone collecting box (81) is arranged on one side wall of the first guide plate (82), an inlet groove (87) is provided on one side wall of the stone collecting box (81), and a second guide plate (85) is welded to the inner wall of the first sand containing box (83).

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