A multi-stage screening sand and gravel device for engineering construction

Abstract

The utility model discloses an engineering construction multistage screening gravel device belongs to sand and stone processing equipment technical field. It includes box, baffle and screen assembly, the box inner inclined surface welds four baffle, and bottom is equipped with support foot, and top is equipped with feed inlet, and screen assembly is installed in the box groove through first support axle, and screen assembly contains small hole round ring screen plate, medium hole round ring screen plate, big hole round ring screen plate and discharge pipe, and multilayer screen plate is fixed through the connection support ring, and cam drive knock column drives knock board, and cooperation spring reset periodic knock screen plate, prevent block, and reciprocating cleaning assembly is driven arc brush along screen plate axial reciprocating movement through reciprocating screw rod, realizes surface impurity cleaning, and single motor passes through transmission assembly synchronous drive rotary screen, knock screen and cleaning assembly. The device solves the problem that traditional screening equipment is easy to block, and the cleaning is inconvenient, and has multistage synchronous screening, self -cleaning prevents and so on the advantage of blocking.

Description

Technical Field

[0001] This utility model relates to the technical field of sand and gravel processing equipment, specifically a multi-stage screening device for sand and gravel in engineering construction. Background Technology

[0002] The rapid development of the engineering construction field has led to increasingly higher requirements for the quality of building materials. As a key raw material for concrete preparation, the particle size classification accuracy of sand and gravel directly affects structural strength and construction quality. On construction sites, it is often necessary to classify sand and gravel into multiple grades (coarse, medium, and fine) according to particle size to meet the mix requirements of different engineering projects.

[0003] In actual operation, sand and gravel screening devices often experience screen clogging during multi-stage screening of sand and gravel with high mud content, high moisture content, or complex particle composition. Existing screening equipment typically lacks efficient anti-clogging and cleaning mechanisms, making it difficult to adapt to the needs of continuous screening operations, resulting in decreased screening efficiency and affecting the operational stability of the device. Utility Model Content

[0004] The purpose of this invention is to provide a multi-stage sand and gravel screening device for engineering construction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage screening sand and gravel device for engineering construction, comprising a box and partitions. Four partitions are welded to the inclined surface in the middle of the box. Four support feet are installed at the four corners of the lower surface of the box. A feed inlet is welded to the upper surface of the box. A groove is formed on the upper surface of the box, and a first support shaft is connected between opposite sidewalls of the groove via bearings. A screen assembly is installed on the first support shaft. Two first support blocks are installed on both sides of the groove on the upper surface of the box. A fixing plate is welded between the two first support blocks. A second support shaft is connected between the two first support blocks via bearings. Several cams are welded to the side. Several through holes are evenly opened on the surface of the fixed plate. Several striking posts are slidably installed in the through holes. Several spring mounting blocks are connected to one end of several striking posts. Several springs are connected between several spring mounting blocks and the fixed plate. Several striking plates are installed at the other end of several striking posts. Several trigger posts are welded to the side walls of several striking posts. The side walls of several trigger posts are in contact with the side walls of several cams. A reciprocating cleaning assembly is installed on the upper surface of the box. A motor is installed on the upper surface of the box. A transmission assembly is connected between the output shaft of the motor and the first support shaft, the second support shaft, and the reciprocating lead screw.

[0006] Preferably, the screen assembly includes a discharge pipe welded to a first support shaft, a plurality of through slots evenly spaced on the discharge pipe, a large-hole circular ring screen plate installed on the side of the discharge pipe, a medium-hole circular ring screen plate installed on the side of the large-hole circular ring screen plate, and a small-hole circular ring screen plate installed on the side of the medium-hole circular ring screen plate. Connecting support rings are fixedly connected to the outer walls of the discharge pipe and the large-hole circular ring screen plate, the large-hole circular ring screen plate and the medium-hole circular ring screen plate, and the medium-hole circular ring screen plate and the small-hole circular ring screen plate by screws. A connecting support ring is installed on one edge of the small-hole circular ring screen plate by screws. The lower end of the feed inlet is located inside the small-hole circular ring screen plate. The screen plates are easy to disassemble and replace.

[0007] Preferably, several of the striking plates are attached to the corresponding small-hole circular mesh plate, medium-hole circular mesh plate, and large-hole circular mesh plate.

[0008] Preferably, the upper surface of the four partition plates is equipped with a plurality of rollers via a rotating shaft, and the outer surface of the rollers is in contact with the outer surface of the connecting support ring.

[0009] Preferably, the reciprocating cleaning assembly includes two sides of a groove on the upper surface of the housing, and two second support blocks are installed beside two first support blocks. A fixed column is welded between the two second support blocks, and a limit slider is slidably connected to the fixed column. A reciprocating screw is connected between the two second support blocks via a bearing, and a reciprocating slider is slidably connected to the reciprocating screw. An arc-shaped brush is welded to the side of the reciprocating slider, and a connecting column is welded between the reciprocating slider and the limit slider. This achieves a reciprocating cleaning mesh plate.

[0010] Preferably, the arc-shaped brush is attached to the small-hole circular mesh plate, the medium-hole circular mesh plate, and the large-hole circular mesh plate. This removes adhering impurities and maintains the permeability of the sieve holes.

[0011] Preferably, the transmission assembly includes a second sprocket mounted on the motor output shaft, a first sprocket mounted on the side wall outside the discharge pipe on the first support shaft, a chain meshing between the first and second sprockets, a fourth sprocket mounted on the side wall outside the discharge pipe on the first support shaft, a third sprocket welded to the side wall of the reciprocating screw without a closed spiral track, a chain meshing between the third and fourth sprockets, a fifth sprocket mounted on the side wall outside the discharge pipe on the first support shaft, a sixth sprocket welded to the second support shaft, and a chain meshing between the fifth and sixth sprockets. Power is precisely distributed to the three systems of screen rotation, screen striking, and cleaning components.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] Multi-stage screening with high efficiency integration: The screen assembly uses coaxially fitted small-hole, medium-hole, and large-hole circular ring screen plates, which are fixed to the discharge pipe by connecting support ring screws. When sand and gravel fall into the rotating screen plate from the feed port, three-stage particle size classification can be completed in a single operation, and the modular screen plates facilitate quick replacement.

[0014] Excellent dynamic anti-clogging performance: The striking plate fits tightly against each level of the screen, and the cam-driven trigger column compresses the spring, causing the striking column to periodically strike the screen surface. This design directly transmits the mechanical impact force to the screen holes, dislodging embedded particles, reducing the probability of clogging, and ensuring the stability of continuous operation.

[0015] Self-cleaning with no blind spots: The reciprocating cleaning component is guided by a fixed column and a reciprocating screw, with the connecting column linking the limit slider and the reciprocating slider, driving the arc-shaped brush to move precisely along the axial direction of the screen. The brush curvature fully conforms to the screen, removing surface impurities and maintaining long-term screen permeability.

[0016] Optimized power transmission loss: The rollers on the partition plate roll in contact with the outer surface of the connecting support ring, transforming traditional sliding friction into rolling friction, reducing the rotational resistance of the screen, significantly reducing the motor load and extending the equipment life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the radial cross-sectional structure of the screen assembly of this utility model;

[0019] Figure 3 This is a schematic diagram of the transmission component structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the top part structure of this utility model;

[0021] Figure 5 For the present utility model Figure 4 Enlarged structural diagram at point A in the middle;

[0022] Figure 6 This is a perspective structural diagram of the reciprocating slider of this utility model.

[0023] In the diagram: 1. Box body; 2. Partition plate; 3. Support foot; 5. Feed inlet; 6. Small-hole circular mesh plate; 7. Medium-hole circular mesh plate; 8. Large-hole circular mesh plate; 9. Discharge pipe; 10. First support shaft; 11. Connecting support ring; 12. Roller; 13. First support block; 14. Second support block; 15. Fixing plate; 16. Second support shaft; 17. Fixing column; 18. Reciprocating screw; 19. Reciprocating slider; 20. First sprocket; 21. Second sprocket; 22. Third sprocket; 23. Fourth sprocket; 24. Fifth sprocket; 25. Sixth sprocket; 26. Cam; 27. Spring mounting block; 28. Striking column; 29. ​​Triggering column; 30. Striking plate; 31. Limiting slider; 32. Connecting column; 33. Arc-shaped brush. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Please see Figure 1-3This utility model provides a technical solution: a multi-stage screening sand and gravel device for engineering construction, including a box body 1 and partitions 2. Four partitions 2 are welded to the inclined surface in the middle of the box body 1. Four support feet 3 are installed at the four corners of the lower surface of the box body 1. A feed inlet 5 is welded to the upper surface of the box body 1. A groove is opened on the upper surface of the box body 1, and a first support shaft 10 is connected between the opposite side walls of the groove through bearings. A screen assembly is installed on the first support shaft 10. Two first support blocks 13 are installed on both sides of the groove on the upper surface of the box body 1. A fixing plate 15 is welded between the two first support blocks 13. A second support shaft 16 is connected between the two first support blocks 13 through bearings. Several [unclear] are welded to the side of the second support shaft 16. The cam 26 and the fixed plate 15 have several through holes evenly distributed on their surfaces. Several striking posts 28 are slidably installed in the through holes. Several spring mounting blocks 27 are connected to one end of each striking post 28. Several springs are connected between the spring mounting blocks 27 and the fixed plate 15. Several striking plates 30 are installed at the other end of each striking post 28. Several trigger posts 29 are welded to the side walls of each striking post 28. The side walls of the trigger posts 29 are in contact with the side walls of each cam 26. A reciprocating cleaning assembly is installed on the upper surface of the housing 1. A motor is installed on the upper surface of the housing 1. A transmission assembly is connected between the motor output shaft and the first support shaft 10, the second support shaft 16, and the reciprocating lead screw 18.

[0028] Furthermore, the screen assembly includes a discharge pipe 9 welded to a first support shaft 10. The discharge pipe 9 has several equally spaced through slots. A large-hole circular annular screen plate 8 is installed on the side of the discharge pipe 9. A medium-hole circular annular screen plate 7 is installed on the side of the large-hole circular annular screen plate 8. A small-hole circular annular screen plate 6 is installed on the side of the medium-hole circular annular screen plate 7. Connecting support rings 11 are fixedly connected to the outer walls of the discharge pipe 9 and the large-hole circular annular screen plate 8, the large-hole circular annular screen plate 8 and the medium-hole circular annular screen plate 7, and the medium-hole circular annular screen plate 7 and the small-hole circular annular screen plate 6 by screws. A connecting support ring 11 is installed on one edge of the small-hole circular annular screen plate 6 by screws. The lower end of the feed inlet 5 is located inside the small-hole circular annular screen plate 6. The screen plates are easy to disassemble and replace.

[0029] Furthermore, several striking plates 30 are attached to the corresponding small-hole circular mesh plate 6, medium-hole circular mesh plate 7, and large-hole circular mesh plate 8.

[0030] Furthermore, several rollers 12 are mounted on the upper surface of the four partitions 2 via a rotating shaft, and the outer surface of the rollers 12 is in contact with the outer surface of the connecting support ring 11.

[0031] Furthermore, the reciprocating cleaning assembly includes the upper surface of the housing 1, and two second support blocks 14 are installed beside the two first support blocks 13. A fixing column 17 is welded between the two second support blocks 14, and a limit slider 31 is slidably connected to the fixing column 17. A reciprocating screw 18 is connected between the two second support blocks 14 via a bearing, and a reciprocating slider 19 is slidably connected to the reciprocating screw 18. An arc-shaped brush 33 is welded to the side of the reciprocating slider 19, and a connecting column 32 is welded between the reciprocating slider 19 and the limit slider 31. This achieves the reciprocating cleaning of the mesh plate.

[0032] Furthermore, the arc-shaped brush 33 is attached to the small-hole circular mesh plate 6, the medium-hole circular mesh plate 7, and the large-hole circular mesh plate 8. This removes adhering impurities and maintains the permeability of the sieve holes.

[0033] Furthermore, the transmission assembly includes a second sprocket 21 mounted on the motor output shaft; a first sprocket 20 mounted on the side wall outside the discharge pipe 9 on the first support shaft 10; a chain meshing between the first sprocket 20 and the second sprocket 21; a fourth sprocket 23 mounted on the side wall outside the discharge pipe 9 on the first support shaft 10; a third sprocket 22 welded to the side wall of the reciprocating screw 18 without a closed spiral track; a chain meshing between the third sprocket 22 and the fourth sprocket 23; a fifth sprocket 24 mounted on the side wall outside the discharge pipe 9 on the first support shaft 10; a sixth sprocket 25 welded to the second support shaft 16; and a chain meshing between the fifth sprocket 24 and the sixth sprocket 25. Power is precisely distributed to the three systems of screen rotation, screen striking, and cleaning components.

[0034] Working principle:

[0035] Sand and gravel feeding and preliminary screening: Sand and gravel fall from the feed inlet 5 into the rotating perforated ring screen plate 6. The motor drives the first support shaft 10 to rotate through the transmission component, causing the screen assembly to rotate as a whole. Small sand and gravel particles fall into the lower collection area after being screened by the perforated ring screen plate 6; medium-sized particles move with the sand and gravel flow to the medium-hole ring screen plate 7 to complete secondary screening; large particles are finally separated by the large-hole ring screen plate 8, achieving three-stage precise particle size classification. Finally, the largest particles are discharged from several equally spaced channels on the discharge pipe 9 and fall into the lower collection area.

[0036] Dynamic anti-blocking mechanism: The second support shaft 16 rotates under the drive of the transmission assembly, and the cam 26 welded to it periodically squeezes the trigger post 29, forcing the striking post 28 to compress the spring and move outward. When the cam 26 disengages from the trigger post 29, the spring releases its potential energy, driving the striking plate 30 to strike the corresponding mesh plate surface and shake off the embedded particles.

[0037] Synchronous self-cleaning process: The first support shaft 10 drives the reciprocating screw 18 to rotate through the transmission assembly. The reciprocating slider 19 moves axially under the drive of the screw's helical groove, and slides on the fixed column 17 via the linkage limit slider 31 through the connecting column 32. The arc-shaped brush 33 welded to the reciprocating slider 19 moves axially back and forth close to the outer surface of the mesh plate to thoroughly remove residual impurities.

[0038] Inclined Setting and Support Optimization: During the rotation of the screen, the outer surface of the connecting support ring 11 and the roller 12 on the partition plate 2 form a rolling pair, converting sliding friction into rolling friction and reducing power loss. The support feet 3 keep the box 1 tilted, so that the discharge pipe 9 is at the lowest end of the screen assembly, using gravity to accelerate the flow of sand and gravel.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage sand and gravel screening device for engineering construction, comprising a housing (1) and a partition (2), characterized in that: Four partitions (2) are welded to the inclined surface in the middle of the box (1). Four support feet (3) are installed at the four corners of the lower surface of the box (1). A feed inlet (5) is welded to the upper surface of the box (1). A groove is opened on the upper surface of the box (1), and a first support shaft (10) is connected between the opposite side walls of the groove by a bearing. A screen assembly is installed on the first support shaft (10). Two first support blocks (13) are installed on both sides of the groove on the upper surface of the box (1). A fixing plate (15) is welded between the two first support blocks (13). A second support shaft (16) is connected between the two first support blocks (13) by a bearing. Several cams (26) are welded to the side of the second support shaft (16). The fixing plate ( 15) Several through holes are evenly opened on the surface, and several striking posts (28) are slidably installed in the through holes. One end of each striking post (28) is connected to a spring mounting block (27). Several springs are connected between each spring mounting block (27) and the fixing plate (15). A striking plate (30) is installed at the other end of each striking post (28). A trigger post (29) is welded to the side wall of each striking post (28). The side wall of each trigger post (29) is in contact with the side wall of the cam (26). A reciprocating cleaning assembly is installed on the upper surface of the housing (1). A motor is installed on the upper surface of the housing (1). A transmission assembly is connected between the output shaft of the motor and the first support shaft (10), the second support shaft (16), and the reciprocating lead screw (18).

2. The multi-stage screening sand and gravel device for engineering construction according to claim 1, characterized in that: The screen assembly includes a discharge pipe (9) welded on a first support shaft (10). Several through slots are equally spaced on the discharge pipe (9). A large-hole circular ring screen plate (8) is installed on the side of the discharge pipe (9). A medium-hole circular ring screen plate (7) is installed on the side of the large-hole circular ring screen plate (8). A small-hole circular ring screen plate (6) is installed on the side of the medium-hole circular ring screen plate (7). A connecting support ring (11) is fixedly connected between the discharge pipe (9) and the outer walls of the large-hole circular ring screen plate (8), the large-hole circular ring screen plate (8) and the medium-hole circular ring screen plate (7), and the medium-hole circular ring screen plate (7) and the small-hole circular ring screen plate (6) by screws. A connecting support ring (11) is installed on one edge of the small-hole circular ring screen plate (6) by screws. The lower end of the feed inlet (5) is located inside the small-hole circular ring screen plate (6).

3. The multi-stage screening sand and gravel device for engineering construction according to claim 1, characterized in that: Several of the aforementioned striking plates (30) are attached to the corresponding small-hole circular mesh plate (6), medium-hole circular mesh plate (7), and large-hole circular mesh plate (8).

4. The multi-stage screening sand and gravel device for engineering construction according to claim 1, characterized in that: Several rollers (12) are mounted on the upper surface of the four partitions (2) via a rotating shaft, and the outer surface of the rollers (12) is in contact with the outer surface of the connecting support ring (11).

5. The multi-stage screening sand and gravel device for engineering construction according to claim 1, characterized in that: The reciprocating cleaning assembly includes two sides of the groove on the upper surface of the housing (1), and two second support blocks (14) are installed on one side of the two first support blocks (13). A fixed column (17) is welded between the two second support blocks (14). A limit slider (31) is slidably connected on the fixed column (17). A reciprocating screw (18) is connected between the two second support blocks (14) through a bearing. A reciprocating slider (19) is slidably connected on the reciprocating screw (18). An arc-shaped brush (33) is welded to the side of the reciprocating slider (19). A connecting column (32) is welded between the reciprocating slider (19) and the limit slider (31).

6. The multi-stage screening device for sand and gravel in engineering construction according to claim 5, characterized in that: The arc-shaped brush (33) is attached to the small-hole circular mesh plate (6), the medium-hole circular mesh plate (7), and the large-hole circular mesh plate (8).

7. The multi-stage screening device for sand and gravel in engineering construction according to claim 1, characterized in that: The transmission assembly includes a second sprocket (21) mounted on the motor output shaft, a first sprocket (20) mounted on the side wall outside the discharge pipe (9) on the first support shaft (10), a chain meshing between the first sprocket (20) and the second sprocket (21), a fourth sprocket (23) mounted on the side wall outside the discharge pipe (9) on the first support shaft (10), a third sprocket (22) welded to the side wall of the reciprocating screw (18) without a closed spiral track, a chain meshing between the third sprocket (22) and the fourth sprocket (23), a fifth sprocket (24) mounted on the side wall outside the discharge pipe (9) on the first support shaft (10), a sixth sprocket (25) welded to the second support shaft (16), and a chain meshing between the fifth sprocket (24) and the sixth sprocket (25).

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