Adjustable sand screening device for construction

Abstract

The invention belongs to the technical field of constructional engineering, and particularly relates to an adjustable construction sand screening device which comprises a bottom plate, a protection structure is fixedly connected to the upper end face of the bottom plate, a feeding plate is fixedly connected to the upper end face of the protection structure, a separation structure is fixedly connected to the right side of the lower end face of the feeding plate, and a pushing structure is arranged in an inner cavity of the separation structure. A driving structure is arranged on the right end face of the separation structure, a screening structure is arranged in the middle of the right side of an inner cavity of the protection structure, adjusting structures are arranged on the right sides of the end faces of the front side and the rear side of the protection structure correspondingly, and a storage structure is fixedly connected to the lower end face of the inner cavity of the protection structure. The large-size gravel screening device has the advantages that the large-size gravel on the screening structure is cleaned through the movement of the pushing plate and the pushing block, so that the effect of conveniently adding and sorting the gravel by personnel in use is achieved, and the gravel screening precision is improved in use to guarantee that the gravel passes through screening.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and in particular relates to an adjustable sand screening device for construction. Background Art

[0002] Construction projects refer to the engineering entities formed by the construction of various types of buildings and their ancillary facilities and the installation of supporting lines, pipelines, and equipment. "Buildings" refer to projects with roofs, beams, columns, walls, foundations, and internal spaces that can meet people's needs for production, residence, study, and public activities.

[0003] Construction projects refer to the planning, investigation, design, construction, completion and other technical work and completed engineering entities for the construction, reconstruction or expansion of buildings and ancillary structures and facilities, as well as the installation of supporting lines, pipelines and equipment. They also refer to the construction projects of various houses and buildings, also known as construction workload.

[0004] The existing screening device has a simple structure and can only screen gravel of a specific size. At the same time, the screen is set at an angle. When the gravel is screened for a certain period of time, qualified and unqualified gravel are easily mixed, affecting work efficiency. At the same time, the short contact time between the gravel and the screen affects the screening effect.

[0005] The invention patent with publication number CN107138387A provides a crushing and screening sand device for construction, but it still has shortcomings in screening efficiency, especially when processing a large amount of sand and stone materials, the screening speed and accuracy may not meet the needs of efficient construction.

[0006] The invention patent with publication number CN115382749A provides a sand screening device for use in construction. However, long-term use of the sand screening device may cause the conveyor belt to become loose and slip, resulting in insufficient force transmission, and affecting the normal operation of the sand screening device.

[0007] Therefore, the existing construction sand screening device cannot meet the needs in actual use, so there is an urgent need for improved technology in the market to solve the above problems. Summary of the invention

[0008] In view of the technical problem that the above-mentioned existing screening device can only screen sand and gravel of a specific size, the present invention provides an adjustable sand screening device for construction.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0010] An adjustable sand screening device for construction comprises a base plate, an upper surface of the base plate is fixedly connected to a protective structure, an upper surface of the protective structure is fixedly connected to a feed plate, a lower surface of the feed plate is fixedly connected to a separation structure on the right side, an inner cavity of the separation structure is provided with a pushing structure, a right end surface of the separation structure is provided with a driving structure, a screening structure is provided in the middle of the right side of the inner cavity of the protective structure, adjustment structures are provided on the right sides of the front and rear end surfaces of the protective structure, and a storage structure is fixedly connected to the lower end surface of the inner cavity of the protective structure.

[0011] The protection structure includes a protection frame fixedly connected to the upper end surface of the bottom plate, a material guide frame is symmetrically fixedly connected to the middle part of the protection frame along the longitudinal center line, a longitudinally arranged material dividing cone is fixedly connected to the middle part of the inner cavity of the material guide frame, a screening structure is arranged on the upper end surface of the material dividing cone, a feed plate is fixedly connected to the upper end surface of the protection frame, and grooves matching the screening structure are provided on the right sides of the front and rear end surfaces of the protection frame.

[0012] The separation structure includes a sealing plate fixedly connected to the right side of the lower end surface of the feed plate, a placement plate fixedly connected to the left side of the lower end surface of the feed plate, a flipping structure is arranged on the lower end surface of the placement plate, the flipping structure includes a rotating sleeve arranged on the left side of the lower end of the placement plate, a torsion spring is movably sleeved in the inner cavity of the rotating sleeve, the rotating sleeve is located in the inner cavity of the torsion spring and is movably sleeved with a connecting shaft, the connecting shaft is fixedly connected to the placement plate, the two ends of the torsion spring in the inner cavity of the rotating sleeve are respectively fixedly connected to the rotating sleeve and the connecting shaft, the lower part of the outer surface of the rotating sleeve is fixedly connected to the flipping plate, and a pushing structure is arranged between the sealing plate and the placement plate.

[0013] The pushing structure includes a threaded rod symmetrically connected between a sealing plate and a placing plate along a center line, a pushing plate is threadedly connected to the outer surface of the threaded rod, a pushing block is fixedly connected to the left end of the pushing plate, and the pushing plate is slidably connected to the upper end surface of the screening structure.

[0014] The driving structure includes a worm wheel which is symmetrically connected to the right end face of the sealing plate and is rotatably connected along the center line. The right end face of the sealing plate is located at the lower end of the worm wheel and is rotatably connected to a worm through a bracket. Two worms are provided. The right end face of the sealing plate is located between the two worms and is fixedly connected to a driving motor. The rotating shafts on the front and rear sides between the two worms are fixedly connected to the output end of the driving motor.

[0015] The screening structure includes an upper screening plate slidably connected to the lower end of the pushing plate in the inner cavity of the protective structure, and a lower screening plate slidably connected to the lower end surface of the upper screening plate. The front and rear end surfaces of the upper and lower screening plates are fixedly connected with a control structure, and the control structure is located in grooves on the front and rear sides of the protective frame. The control structure includes a connecting rod symmetrically fixedly connected to the front and rear end surfaces of the upper and lower screening plates along the center line, and one end of the connecting rod away from the upper and lower screening plates is fixedly connected to a connecting frame. Two connecting frames are provided, and the upper and lower end surfaces between the two connecting frames are evenly fixedly connected with latch teeth.

[0016] The adjusting structure includes an adjusting motor fixedly connected to the middle of the front end face of the protective frame, and adjusting brackets are fixedly connected on both sides of the groove on the outer surface of the protective frame. An adjusting threaded rod is rotatably connected to the inner cavity of the adjusting bracket, and the adjusting threaded rod is positioned between the two connecting frames. The threads on the outer surface of the adjusting threaded rod are meshed with the latch teeth. One end of the adjusting threaded rod is rotatably connected to a transmission structure, and the other end of the adjusting threaded rod passes through the adjusting bracket and is fixedly connected to the output end of the adjusting motor. The transmission structure includes pulleys rotatably connected to the right end faces of the two adjusting brackets, and the outer surfaces of the two pulleys are transmission-connected with belts. The right end face rotating shafts of the two adjusting threaded rods pass through the adjusting brackets and are fixedly connected to the two pulleys respectively.

[0017] The storage structure includes a slide rail symmetrically fixedly connected to the upper end surface of the base plate along the center line, a slider is symmetrically slidably connected to the upper end surface of the slide rail, and a storage box is fixedly connected to the upper end surface of the slider on the outer surface of the slide rail. Two storage boxes are provided, and the two storage boxes are symmetrically arranged on the left and right sides of the lower end of the dividing cone.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention installs and places the feed plate and the screening structure through the protective structure arranged on the upper end surface of the bottom plate during use, and then guides the flow direction of the gravel through the guide frame and the dividing cone, installs and places the pushing structure through the separation structure on the lower end surface of the feed plate during use, and then limits the accumulation of the gravel through the sealing plate and the flip structure, limits the gravel accumulation area through the flip plate through the flip structure on the separation structure during use, and then rotates the flip plate through the rotating sleeve and the connecting shaft, and resets it after flipping, and rotates the pushing plate left and right through the pushing structure on the separation structure through the threaded rod during use, so that the pushing plate moves left and right, and then the large-sized gravel on the screening structure is cleaned by the movement of the pushing plate and the pushing block, which makes it convenient for personnel to add and sort the gravel during use, and improves the gravel screening accuracy during use to ensure that all the gravel passes the screening.

[0020] 2. The present invention drives the rotation of the threaded rod through the driving structure arranged on the separation structure during use, and then controls the forward and reverse rotation of the threaded rod through the worm gear and the worm, separates and screens the sand and gravel through the screening structure in the inner cavity of the protective structure during use, and then adjusts the pores of the screening structure through the mutual sliding between the upper screening plate and the lower screening plate, adjusts the relative sliding size of the upper screening plate and the lower screening plate during use through the control structure on the screening structure, adjusts the upper screening plate and the lower screening plate during use through the adjustment structure on the outer surface of the protective structure, and then makes the adjusting threaded rods on both sides rotate in the same direction at the same time through the transmission structure, and through the storage structure on the upper end surface of the bottom plate, the qualified and unqualified sand and gravel after screening are classified and placed in the storage box during use, and then the slide rail is used to facilitate personnel to store in the storage box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0023] Figure 1 It is a schematic diagram of the main stereoscopic structure of the present invention;

[0024] Figure 2 This is a schematic diagram of a horizontal half-section three-dimensional structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the installation structure of the screening structure of the present invention;

[0026] Figure 4 For the present invention Figure 2 A schematic diagram of the enlarged structure of the middle A area;

[0027] Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure of area B in the middle.

[0028] Among them: 1 is a bottom plate, 2 is a protective structure, 21 is a protective frame, 22 is a material guide frame, 23 is a material dividing cone, 3 is a feeding plate, 4 is a separation structure, 41 is a sealing plate, 42 is a placement plate, 43 is a flip structure, 431 is a rotating sleeve, 432 is a connecting shaft, 433 is a flip plate, 5 is a pushing structure, 51 is a threaded rod, 52 is a pushing plate, 53 is a pushing block, 6 is a driving structure, 61 is a worm gear, 62 is a worm, 63 is a driving motor, 7 is a screening structure, 71 is an upper screening plate, 72 is a lower screening plate, 73 is a control structure, 731 is a connecting rod, 732 is a connecting frame, 733 is a clamping tooth, 8 is an adjusting structure, 81 is an adjusting motor, 82 is an adjusting bracket, 83 is an adjusting threaded rod, 84 is a transmission structure, 841 is a pulley, 842 is a belt, 9 is a storage structure, 91 is a slide rail, and 92 is a storage box. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. These descriptions are only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 this application can be understood according to specific circumstances.

[0033] Example 1

[0034] like Figure 1-5As shown, this embodiment is an adjustable sand screening device for construction, including a base plate 1, a protective structure 2 is fixedly connected to the upper end surface of the base plate 1, a feed plate 3 is fixedly connected to the upper end surface of the protective structure 2, a separation structure 4 is fixedly connected to the right side of the lower end surface of the feed plate 3, a pushing structure 5 is arranged in the inner cavity of the separation structure 4, a driving structure 6 is arranged on the right end surface of the separation structure 4, a screening structure 7 is arranged in the middle of the right side of the inner cavity of the protective structure 2, adjustment structures 8 are arranged on the right sides of the front and rear end surfaces of the protective structure 2, and a storage structure 9 is fixedly connected to the lower end surface of the inner cavity of the protective structure 2.

[0035] Furthermore, the protective structure 2 includes a protective frame 21 fixedly connected to the upper end surface of the base plate 1, a material guide frame 22 is symmetrically fixedly connected to the middle part of the protective frame 21 along the longitudinal center line, a longitudinally arranged material dividing cone 23 is fixedly connected to the middle part of the inner cavity of the material guide frame 22, a screening structure 7 is arranged on the upper end surface of the material dividing cone 23, a feed plate 3 is fixedly connected to the upper end surface of the protective frame 21, and grooves matching the screening structure 7 are formed on the right sides of the front and rear end surfaces of the protective frame 21. The feed plate 3 and the screening structure 7 are installed and placed through the protective structure 2 on the upper end surface of the base plate 1 during use, and then the flow direction of the gravel is guided by the material guide frame 22 and the material dividing cone 23.

[0036] Further, the separation structure 4 includes a sealing plate 41 fixedly connected to the right side of the lower end surface of the feed plate 3, a placement plate 42 fixedly connected to the left side of the lower end surface of the feed plate 3, a flip structure 43 is arranged on the lower end surface of the placement plate 42, and the flip structure 43 includes a rotating sleeve 431 arranged on the left side of the lower end of the placement plate 42, a torsion spring is movably sleeved in the inner cavity of the rotating sleeve 431, and the rotating sleeve 431 is located in the inner cavity of the torsion spring and is movably sleeved and connected to a connecting shaft 432, and the connecting shaft 432 is fixedly connected to the placement plate 42, and the two ends of the torsion spring in the inner cavity of the rotating sleeve 431 are respectively connected to the rotating sleeve 431 and the connecting shaft 432. The rotating sleeve 431 is fixedly connected with a flip plate 433 at the lower part of the outer surface thereof, and a pushing structure 5 is arranged between the sealing plate 41 and the placing plate 42. The pushing structure 5 is installed and placed through the separation structure 4 on the lower end surface of the feed plate 3 during use, and then the accumulation of gravel is limited by the sealing plate 41 and the flip structure 43. The gravel accumulation area is limited by the flip plate 433 during use through the flip structure 43 on the separation structure 4, and then the flip plate 433 is rotated by the rotating sleeve 431 and the connecting shaft 432, and reset after flipping.

[0037] Furthermore, the pushing structure 5 includes a threaded rod 51 which is symmetrically connected to the sealing plate 41 and the placing plate 42 and rotates along the center line. A pushing plate 52 is threadedly connected to the outer surface of the threaded rod 51. A pushing block 53 is fixedly connected to the left end of the pushing plate 52. The pushing plate 52 is slidably connected to the upper end surface of the screening structure 7. The pushing structure 5 on the separation structure 4 is rotated by the threaded rod 51 during use, so that the pushing plate 52 moves left and right. Then, the large-sized gravel on the screening structure 7 is cleaned by the movement of the pushing plate 52 and the pushing block 53, which makes it convenient for personnel to add and sort the gravel during use, thereby improving the gravel screening accuracy during use and ensuring that all the gravel passes the screening.

[0038] Furthermore, the driving structure 6 includes a worm wheel 61 which is symmetrically connected to the right end face of the sealing plate 41 and rotates along the center line. The right end face of the sealing plate 41 is located at the lower end of the worm wheel 61 and is rotatably connected to a worm 62 through a bracket. The right end face of the sealing plate 41 is located between the two worm gears 62 and is fixedly connected to a driving motor 63. The front and rear side rotating shafts between the two worm wheels 62 pass through the bracket and are fixedly connected to the output end of the driving motor 63. The driving structure 6 on the separation structure 4 drives the rotation of the threaded rod 51 during use, and then the forward and reverse rotation of the threaded rod 51 is controlled by the worm wheel 61 and the worm 62.

[0039] Furthermore, the screening structure 7 includes an upper screening plate 71 slidably connected to the lower end of the pushing plate 52 in the inner cavity of the protective structure 2, and a lower screening plate 72 is slidably connected to the lower end surface of the upper screening plate 71. The front and rear end surfaces of the upper and lower screening plates 71 and 72 are fixedly connected with a control structure 73. The control structure 73 is located in the grooves on the front and rear sides of the protective frame 21. The control structure 73 includes a connecting rod 731 symmetrically fixedly connected to the front and rear end surfaces of the upper and lower screening plates 71 and 72 along the center line, and the ends of the connecting rod 731 away from the upper and lower screening plates 71 and 72 are fixedly connected with a connecting frame 732. The upper and lower end surfaces between the two connecting frames 732 are evenly fixedly connected with latch teeth 733. The screening structure 7 in the inner cavity of the protective structure 2 is used to separate and screen gravel, and then the pores of the screening structure 7 are adjusted by the mutual sliding between the upper and lower screening plates 71 and 72. The relative sliding size of the upper and lower screening plates 71 and 72 is adjusted by the control structure 73 on the screening structure 7 during use.

[0040] Furthermore, the adjustment structure 8 includes an adjustment motor 81 fixedly connected to the middle part of the front end face of the protective frame 21, and adjustment brackets 82 are fixedly connected to both sides of the groove on the outer surface of the protective frame 21. An adjustment threaded rod 83 is rotatably connected to the inner cavity of the adjustment bracket 82. The adjustment threaded rod 83 is located between the two connecting frames 732, and the outer surface threads of the adjustment threaded rod 83 are meshed with the latch teeth 733. The right end face of the adjustment bracket 83 is rotatably connected to the transmission structure 84, and the right end face shaft of the adjustment threaded rod 83 passes through the adjustment bracket 82 and is fixedly connected to the output end of the adjustment motor 81. The transmission structure 84 includes pulleys 841 rotatably connected to the right end faces of the two adjustment brackets 82 respectively, and the outer surfaces of the two pulleys 841 are transmission-connected with belts 842. The right end face shafts of the two adjustment threaded rods 83 pass through the adjustment brackets 82 and are fixedly connected to the two pulleys 841 respectively. Through the adjustment structure 8 on the outer surface of the protective structure 2, the upper screening plate 71 and the lower screening plate 72 are adjusted during use, and then through the transmission structure 84, the adjustment threaded rods 83 on both sides rotate in the same direction at the same time.

[0041] Furthermore, the storage structure 9 includes a slide rail 91 symmetrically fixedly connected to the upper end surface of the base plate 1 along the center line, and a slider is symmetrically slidably connected to the upper end surface of the slide rail 91. The upper end surface of the slider on the outer surface of the slide rod 91 is fixedly connected to a storage box 92. The two storage boxes 92 are symmetrically arranged on the left and right sides of the lower end of the dividing cone 23. Through the storage structure 9 on the upper end surface of the base plate 1, the qualified and unqualified gravel after screening are classified and placed through the storage box 92 during use, and then the slide rail 91 is used to facilitate personnel to store the storage box 92.

[0042] Working principle: During operation, the gravel is placed in the inner cavity of the feed port on the feed plate 3. At this time, the gravel enters the screening structure 7 under the action of gravity. At this time, the gravel is screened and separated according to the size of the gravel through the upper screening plate 71 and the lower screening plate 72 under the influence of gravity. At the same time, the driving structure 6 is started to rotate the output end of the driving motor 61, so the worm 62 rotates, and then the worm wheel 61 meshing with the worm 62 rotates, and further the threaded rod 51 rotates, so that the pushing plate 51 moves left and right, and then the pushing port 53 slides left and right, so as to push the gravel on the upper screening plate 71. At this time, the large-grained gravel is guided by the dividing cone 23 and the guide frame 22 under the action of gravity, so that the gravel enters the inner cavity of the left storage box 92. When the screening pore size needs to be adjusted, the adjusting structure 8 is started to make The output end of the adjusting motor 81 rotates, thereby driving the adjusting threaded rod 83 to rotate, and then driving the front pulley 841 to rotate, so the belt 842 rotates, and then the rear pulley 842 rotates, so that the two adjusting threaded rods 82 rotate at the same time. At this time, since the adjusting threaded rod 83 and the clamping 733 are engaged with each other, the two connecting frames 732 move toward each other, and then the upper screening plate 71 and the lower screening plate 72 slide toward each other, so that the screening pore size of the screening structure 7 changes. At this time, the gravel that meets the size passes through the upper screening plate 71 and the lower screening plate 72 under gravity, and then enters the inner cavity of the right storage box 92 under the guidance of the guide frame 22 and the dividing cone 23. After a certain period of use, the two storage boxes 92 are pulled respectively, so that the storage boxes 92 are taken out respectively and the gravel in the inner cavity of the storage box 92 is taken out for use.

[0043] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. An adjustable sand screening device for construction, comprising a bottom plate (1), characterized in that: The upper end surface of the bottom plate (1) is fixedly connected to a protective structure (2), the upper end surface of the protective structure (2) is fixedly connected to a feed plate (3), the lower end surface of the feed plate (3) is fixedly connected to a separation structure (4) on the right side, the inner cavity of the separation structure (4) is provided with a pushing structure (5), the right end surface of the separation structure (4) is provided with a driving structure (6), a screening structure (7) is provided in the middle of the right side of the inner cavity of the protective structure (2), the right sides of the front and rear end surfaces of the protective structure (2) are both provided with an adjustment structure (8), and the lower end surface of the inner cavity of the protective structure (2) is fixedly connected to a storage structure (9).

2. The adjustable sand screening device for construction according to claim 1, characterized in that: The protective structure (2) comprises a protective frame (21) fixedly connected to the upper end surface of the bottom plate (1); a material guide frame (22) is fixedly connected to the middle part of the protective frame (21) symmetrically along the longitudinal center line; a longitudinally arranged material distribution cone (23) is fixedly connected to the middle part of the inner cavity of the material guide frame (22); a screening structure (7) is arranged on the upper end surface of the material distribution cone (23); a feed plate (3) is fixedly connected to the upper end surface of the protective frame (21); and grooves matching the screening structure (7) are provided on the right sides of the front and rear end surfaces of the protective frame (21).

3. The adjustable sand screening device for construction according to claim 1, characterized in that: The separation structure (4) comprises a sealing plate (41) fixedly connected to the right side of the lower end surface of the feed plate (3); a placement plate (42) is fixedly connected to the left side of the lower end surface of the feed plate (3); a flip structure (43) is arranged on the lower end surface of the placement plate (42); the flip structure (43) comprises a rotating sleeve (431) arranged on the left side of the lower end of the placement plate (42); a torsion spring is movably sleeved in the inner cavity of the rotating sleeve (431); the rotating sleeve (431) is located in the inner cavity of the torsion spring and is movably sleeved with a connecting shaft (432); the connecting shaft (432) is fixedly connected to the placement plate (42); the two ends of the torsion spring in the inner cavity of the rotating sleeve (431) are respectively fixedly connected to the rotating sleeve (431) and the connecting shaft (432); the lower part of the outer surface of the rotating sleeve (431) is fixedly connected to the flip plate (433); and a pushing structure (5) is arranged between the sealing plate (41) and the placement plate (42).

4. The adjustable sand screening device for construction according to claim 3, characterized in that: The pushing structure (5) comprises a threaded rod (51) symmetrically connected to the sealing plate (41) and the placing plate (42) along the center line, the outer surface of the threaded rod (51) is threadedly connected to a pushing plate (52), the left end of the pushing plate (52) is fixedly connected to a pushing block (53), and the pushing plate (52) is slidably connected to the upper end surface of the screening structure (7).

5. The adjustable sand screening device for construction according to claim 3, characterized in that: The driving structure (6) comprises a worm wheel (61) symmetrically rotatably connected to the right end face of the sealing plate (41) along the center line; the right end face of the sealing plate (41) is located at the lower end of the worm wheel (61) and is rotatably connected to a worm (62) through a bracket; two worms (62) are provided; the right end face of the sealing plate (41) is located between the two worms (62) and is fixedly connected to a driving motor (63); the rotating shafts on the front and rear sides between the two worms (62) are fixedly connected to the output end of the driving motor (63).

6. The adjustable sand screening device for construction according to claim 4, characterized in that: The screening structure (7) comprises an upper screening plate (71) arranged in the inner cavity of the protective structure (2) and slidably connected to the lower end of the push plate (52); the lower end surface of the upper screening plate (71) is slidably connected to the lower screening plate (72); the front and rear end surfaces of the upper screening plate (71) and the lower screening plate (72) are fixedly connected to a control structure (73); the control structure (73) is located in grooves on the front and rear sides of the protective frame (21); the control structure (73) comprises a connecting rod (731) symmetrically fixedly connected to the front and rear end surfaces of the upper screening plate (71) and the lower screening plate (72) along the center line; one end of the connecting rod (731) away from the upper screening plate (71) and the lower screening plate (72) is fixedly connected to a connecting frame (732); two connecting frames (732) are provided, and the upper and lower end surfaces between the two connecting frames (732) are evenly fixedly connected with latch teeth (733).

7. The adjustable sand screening device for construction according to claim 6, characterized in that: The adjustment structure (8) comprises an adjustment motor (81) fixedly connected to the middle part of the front end surface of the protection frame (21); the adjustment brackets (82) are fixedly connected to both sides of the groove on the outer surface of the protection frame (21); the inner cavity of the adjustment bracket (82) is rotatably connected to an adjustment threaded rod (83); the adjustment threaded rod (83) is located between the two connecting frames (732); the thread on the outer surface of the adjustment threaded rod (83) is meshed with the latch teeth (733); one end of the adjustment threaded rod (83) is rotatably connected to a transmission structure (84); the other end of the adjustment threaded rod (83) passes through the adjustment bracket (82) and is fixedly connected to the output end of the adjustment motor (81); the transmission structure (84) comprises pulleys (841) rotatably connected to the right end surfaces of the two adjustment brackets (82); the outer surfaces of the two pulleys (841) are transmission-connected with belts (842); the right end surface rotation shafts of the two adjustment threaded rods (83) pass through the adjustment bracket (82) and are respectively fixedly connected to the two pulleys (841).

8. The adjustable sand screening device for construction according to claim 2, characterized in that: The storage structure (9) comprises a slide rail (91) symmetrically fixedly connected to the upper end surface of the bottom plate (1) along the center line, the upper end surface of the slide rail (91) is symmetrically slidably connected with a slider, and the upper end surfaces of the sliders on the outer surfaces of the slide rail (91) are fixedly connected with storage boxes (92), and two storage boxes (92) are provided, and the two storage boxes (92) are symmetrically arranged on the left and right sides of the lower end of the distribution cone (23).

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