Gravel screening device for building construction

Abstract

A gravel screening device for building construction comprises a screening box body, a coarse screen arranged in the screening box body, a fine screen arranged at the lower end of the coarse screen, and a coarse gravel discharging opening formed in the side end of the screening box body and located at the lower end of the coarse screen. The fine sand discharging opening is formed in the other side end of the screening box body and is positioned at the lower end of the fine screen; and a sliding plate structure which is located at the upper end of the coarse screen mesh, is in sliding connection with the inner wall of the screening box body and is used for pushing gravels to move on the coarse screen mesh in the direction away from the coarse gravel discharging opening is arranged in the screening box body. The purpose of improving the screening effect of the raw materials is finally achieved by pushing the raw materials to be dispersed for the second time, prolonging the screening path of the raw materials and cleaning the screening holes, and compared with the prior art, the raw material screening device has the advantages of being good in economical efficiency, high in operability and high in practicability.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and specifically relates to a sand and gravel screening device for building construction. Background Technology

[0002] In construction, sand and gravel are essential building materials used in the production of concrete, masonry walls, and road surfaces. To ensure the quality and suitability of sand and gravel, the raw materials need to be screened to meet the requirements of the construction project. Sand and gravel screening is typically done using sieves, with the mesh size selected according to specific needs. Screening separates impurities, soil, and stones that are too large or too small from the raw materials, improving the purity and uniformity of the sand and gravel.

[0003] The document with authorization announcement number CN221208888U discloses a rapid sand and gravel screening device for construction, including a washing tank, a screening tank, a first washing component, and a second washing component. The washing tank is fixed above the screening tank. A feed hopper is set at the center of the top of the washing tank. An upper disc and a lower disc are respectively set inside the washing tank. Both the upper disc and the lower disc are fixedly sleeved on a rotating shaft. The bottom end of the rotating shaft passes through the bottom surface of the washing tank and is fixedly connected to the output shaft of a motor. The motor is fixed to the top of the screening tank. A guide hopper is set between the upper disc and the lower disc. A collision sleeve is fixed on the inner wall of the washing tank.

[0004] However, the device still has the following problems: the sand and gravel are screened by sliding on the inclined screen by their own weight in the screening box. Due to the large difference in the quality of the sand and gravel, the excessively heavy sand and gravel are easy to slide down quickly, while the excessively light sand and gravel will remain on the screen and accumulate. In the environment of water washing, they are also prone to sticking together. All of the above situations require the device to be shut down for maintenance, which greatly reduces the screening efficiency. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide a sand and gravel screening device for construction, which improves the screening effect of raw materials by promoting secondary dispersion of raw materials, extending the screening path of raw materials, and cleaning the screen holes. Compared with the prior art, it has the advantages of good economy, strong operability, and strong practicality.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A sand and gravel screening device for construction includes a screening box, a coarse screen disposed inside the screening box, a fine screen disposed below the coarse screen, a coarse sand and gravel discharge outlet disposed on the side of the screening box and located below the coarse screen, and a fine sand and gravel discharge outlet disposed on the other side of the screening box and located below the fine screen. The screening box is provided with a sliding plate structure located above the coarse screen and slidably connected to the inner wall of the screening box for pushing sand and gravel on the coarse screen in a direction away from the coarse sand and gravel discharge outlet.

[0008] As a further preferred embodiment of the present invention, the sliding plate structure includes a track disposed on the inner wall of the screening box, a rod slidably connected at its end to the track, a fixed rod connected to the rod and located at the upper end of the coarse screen, a push plate disposed on the end of the fixed rod near the coarse screen, and a drive assembly for driving the rod to move along the track.

[0009] As a further preferred embodiment of the present invention, the sliding plate structure further includes a first brush bristle disposed on the surface of the push plate near the coarse screen.

[0010] As a further preferred embodiment of the present invention, the driving assembly includes a driving rail disposed on the outer wall of the screening box and communicating with the track, a driving rod slidably connected to the driving rail and connected to the end of the rod body, and a driving cylinder disposed on the outer wall of the screening box and having its output end connected to the driving rod.

[0011] As a further preferred embodiment of this utility model, the screening box is further provided with a fixed plate structure located at the upper end of the sliding plate structure along the distribution direction of the coarse screen and cooperating with the sliding plate structure to squeeze the sand and gravel.

[0012] As a further preferred embodiment of the present invention, the fixing plate structure includes a fixing groove disposed on the inner wall of the screening box, an installation rod whose end is connected to the fixing groove, and an extrusion plate disposed on the end of the installation rod near the coarse screen.

[0013] As a further preferred embodiment of this utility model, the mounting rod is rotatably connected to the fixing groove; the fixing plate structure also includes a stop bar disposed on the inner wall of the screening box and located on the side end of the mounting rod away from the coarse sand and gravel discharge outlet.

[0014] As a further preferred embodiment of this invention, the extrusion plate is provided with a weight reduction cavity.

[0015] As a further preferred embodiment of the present invention, the fixing plate structure further includes a second brush bristle disposed on the surface of the extrusion plate near the coarse screen.

[0016] As a further preferred embodiment of this invention, the drive track is provided with dustproof bristles.

[0017] The beneficial effects of this utility model are as follows:

[0018] This device features a sliding plate structure on a coarse screen that moves in the opposite direction to the material's movement. By pushing the material to disperse secondary, extending the material's screening path, and cleaning the screen holes, it ultimately improves the screening effect of the material. Compared with existing technologies, it has the advantages of being economical, easy to operate, and highly practical.

[0019] This device further incorporates a fixed plate structure at the upper end of the sliding plate structure's movement path. This plate structure promotes the crushing of raw materials through compression, ultimately improving screening efficiency. This device requires no additional power structure and also boasts advantages such as good economy and strong practicality. Attached Figure Description

[0020] Appendix Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention from the main viewing angle.

[0021] Appendix Figure 2 This is a structural schematic diagram of Embodiment 1 of the present invention from an auxiliary viewing angle.

[0022] Appendix Figure 3 This is a partial schematic diagram A of the present invention.

[0023] Appendix Figure 4 This is a partial structural schematic diagram of Embodiment 2 of the present invention from an auxiliary viewing angle.

[0024] Appendix Figure 5 This is a three-dimensional structural diagram of the sliding plate structure and the fixed plate structure in Embodiment 2 of this utility model.

[0025] Attached diagram descriptions: Sand and gravel a, screening box 11, coarse screen 12, fine screen 13, coarse sand and gravel discharge outlet 14, fine sand and gravel discharge outlet 15, feed inlet 16, discharge outlet 17, coarse sand and gravel receiving box 18, fine sand and gravel receiving box 19, sliding plate structure 2, fixed plate structure 3.

[0026] 21. Track 22. Rod 23. Fixing rod 24. Push plate 25. Drive assembly 26. First brush bristles;

[0027] Drive rail 251, drive rod 252, drive cylinder 253, dustproof brush bristles 254;

[0028] Fixed groove 31, mounting rod 32, extrusion plate 33, stop bar 34, second brush bristles 35;

[0029] Weight reduction chamber 331. Detailed Implementation

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component 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.

[0031] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within 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.

[0033] Example 1

[0034] This embodiment provides a sand and gravel screening device for construction, including a screening box 11, a coarse screen 12 disposed inside the screening box 11, a fine screen 13 disposed at the lower end of the coarse screen 12, a coarse sand and gravel discharge outlet 14 disposed on the side of the screening box 11 and located at the lower end of the coarse screen 12, and a fine sand and gravel discharge outlet 15 disposed on the other side of the screening box 11 and located at the lower end of the fine screen 13. The screening box 11 is provided with a sliding plate structure 2 located at the upper end of the coarse screen 12 and slidably connected to the inner wall of the screening box 11 for pushing sand and gravel a to move on the coarse screen 12 in a direction away from the coarse sand and gravel discharge outlet 14.

[0035] It is understood that the screening box 11 also includes at least a feed inlet 16 located at the upper end of the screening box for conveying screening raw materials into the screening box, and a discharge outlet 17 located at the lower end of the screening box for discharging qualified materials obtained through secondary screening by the coarse screen 12 and the fine screen 13. Preferably, the outer wall of the screening box 11 is also provided with a coarse sand and gravel receiving box 18 for receiving materials discharged from the coarse sand and gravel discharge outlet 14 and a fine sand and gravel receiving box 19 for receiving materials discharged from the fine sand and gravel discharge outlet 15. The two sand and gravel receiving boxes can recycle the discharged materials.

[0036] In this embodiment, the sliding plate structure 2 includes a track 21 disposed on the inner wall of the screening box 11, a rod 22 slidably connected at its end to the track 21, a fixed rod 23 connected to the rod 22 and located at the upper end of the coarse screen 12, a push plate 24 disposed on the end of the fixed rod 23 near the coarse screen 12, a drive assembly 25 for driving the rod 22 to move along the track 21, and a first bristle 26 disposed on the surface of the push plate 24 near the coarse screen 12. The number of tracks 21 is two, which are set on the two opposite inner side walls of the screening box 11. Preferably, the extension direction of the tracks 21 is the same as the setting direction of the coarse screen 12, and is located near the coarse sand and gravel discharge outlet 14, so as to push the sand and gravel that has not passed through the coarse screen 12 near the coarse sand and gravel discharge outlet 14 to the upper end of the coarse screen 12, promote the secondary dispersion of the accumulated sand and gravel raw materials, and improve the screening effect of the coarse screen 12. At the same time, the first brush bristles 26 at the lower end of the push plate 24 can clean the mesh holes on the coarse screen 12 during the movement, avoid clogging the screen holes, and improve the screening efficiency.

[0037] Specifically, the drive assembly 25 includes a drive rail 251 disposed on the outer wall of the screening box 11 and communicating with the track 21, a drive rod 252 slidably connected to the drive rail 251 and connected to the end of the rod 22, a drive cylinder 253 disposed on the outer wall of the screening box 11 and whose output end is connected to the drive rod 252, and dustproof bristles 254 disposed within the drive rail 251. The drive rail 251 is disposed on the inner bottom surface of the track 21 near the outer wall of the screening box 11, and therefore its number and distribution direction are the same as the track 21 to ensure stable movement of the rod 22. The dustproof bristles 254 are used to prevent debris from being discharged from the screening box 11 through the drive rail 251, thus preventing pollution of the working environment. Correspondingly, there are also two drive cylinders 253, corresponding to the two drive rods 252 extending from the two side walls of the box. The connection between the drive rod 252 and the drive cylinder 253 is preferably detachable, which can be achieved using existing structures such as bolts, and therefore will not be described in detail in this embodiment. The purpose of the detachable connection is to disconnect the drive rod 252 from the drive cylinder 253 when the screening work is basically finished, and drive the drive rod 252 to rotate independently, thereby driving the push plate 24 to rotate to increase the distance between the push plate 24 and the coarse screen 12, so that excessive sand and gravel can pass through the push plate 24 and enter the coarse sand and gravel receiving box 18.

[0038] The sand and gravel screening device provided in this embodiment operates on the following principle: the raw material to be screened is fed into the screening box 11 through the upper feed port 16. Under the action of gravity, the raw material moves downward along the coarse screen 12. The sand and gravel passing through the coarse screen 12 fall onto the lower fine screen 13 and are further screened under the action of gravity. Finally, the qualified sand and gravel are discharged from the discharge port 17. Simultaneously, most of the coarse sand and gravel moving downward along the coarse screen 12 is intercepted by the push plate 24 and moved upward along the coarse screen 12 under the action of the drive component 25, thereby promoting the redistribution of the raw material, promoting the breaking and dispersion of agglomerated raw materials, and thus improving the screening effect.

[0039] Example 2

[0040] This embodiment optimizes the structure based on Embodiment 1, aiming to enable the device to effectively crush sand and gravel at the coarse screen, thereby improving screening efficiency. The specific structure is as follows:

[0041] The screening box 11 is further provided with a fixed plate structure 3 located above the sliding plate structure 2 along the distribution direction of the coarse screen 12, and cooperating with the sliding plate structure 2 to compress the sand and gravel a. The fixed plate structure 3 includes a fixing groove 31 on the inner wall of the screening box 11, an installation rod 32 connected to the fixing groove 31 at its end, an extrusion plate 33 on the end of the installation rod 32 near the coarse screen 12, and a second bristle 35 on the surface of the extrusion plate 33 near the coarse screen 12. The installation rod 32 is rotatably connected to the fixing groove 31; the fixed plate structure 3 also includes a stop bar 34 on the inner wall of the screening box 11 and located on the side end of the installation rod 32 away from the coarse sand and gravel discharge outlet 14.

[0042] The fixed plate structure 3 provided in this embodiment has the following technical effects: When the sliding plate structure 2 is working, the push plate 24 pushes the raw material upward along the coarse screen 12 until the raw material is located between the extrusion plate 33 and the push plate 24 and is squeezed. The force generated by the extrusion can promote the crushing of the agglomerated raw material and allow it to pass through the coarse screen 12. Without adding an additional power mechanism, the device has a certain ability to crush raw materials, thereby improving the screening efficiency of the device while satisfying the economic requirements.

[0043] It is worth noting that when the sliding plate structure 2 is not working or has not moved to the position where it can finally produce the effect of squeezing the raw material, since the mounting rod 32 is rotatably connected to the fixed groove 31, even if the squeezing plate 33 intercepts the material, after the first accumulation of the intercepted material, the raw material will push the mounting rod 32 under the action of gravity to drive the squeezing plate 33 to rotate counterclockwise, so that the material can pass through. However, due to the setting of the baffle 34, when the squeezing plate 33 is acted upon by the push plate 24, the squeezing plate 33 will not rotate because it is intercepted by the push rod 34, thus avoiding the loss of the effect of squeezing and crushing agglomerated materials.

[0044] As a further preferred embodiment, the extrusion plate 33 is provided with a weight-reducing cavity 331 inside. The purpose of this arrangement is to improve the ease with which the extrusion plate 33 can be pushed by reducing its weight, while ensuring the basic structural strength of the extrusion plate 33, thereby reducing the amount of material accumulated at the extrusion plate 33 and ensuring screening efficiency.

[0045] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A sand and gravel screening device for construction, comprising a screening box (11), a coarse screen (12) disposed within the screening box (11), a fine screen (13) disposed at the lower end of the coarse screen (12), a coarse sand and gravel discharge outlet (14) disposed on the side of the screening box (11) and located at the lower end of the coarse screen (12), and a fine sand and gravel discharge outlet (15) disposed on the other side of the screening box (11) and located at the lower end of the fine screen (13), characterized in that: The screening box (11) is provided with a sliding plate structure (2) located at the upper end of the coarse screen (12) and slidably connected to the inner wall of the screening box (11) for pushing the sand (a) on the coarse screen (12) in a direction away from the coarse sand discharge outlet (14).

2. The sand and gravel screening device for building construction according to claim 1, characterized in that: The sliding plate structure (2) includes a track (21) disposed on the inner wall of the screening box (11), a rod (22) slidably connected at its end in the track (21), a fixed rod (23) connected to the rod (22) and located at the upper end of the coarse screen (12), a push plate (24) disposed on the end of the fixed rod (23) near the coarse screen (12), and a drive assembly (25) for driving the rod (22) to move along the track (21).

3. The sand and gravel screening device for building construction according to claim 2, characterized in that: The sliding plate structure (2) also includes a first bristle (26) disposed on the surface of the push plate (24) near the coarse screen (12).

4. The sand and gravel screening device for building construction according to claim 2, characterized in that: The drive assembly (25) includes a drive rail (251) disposed on the outer wall of the screening box (11) and communicating with the rail (21), a drive rod (252) slidably connected to the drive rail (251) and connected to the end of the rod (22), and a drive cylinder (253) disposed on the outer wall of the screening box (11) and connected to the drive rod (252) at its output end.

5. The sand and gravel screening device for building construction according to claim 1, characterized in that: The screening box (11) is also provided with a fixed plate structure (3) located at the upper end of the sliding plate structure (2) along the distribution direction of the coarse screen (12) and cooperating with the sliding plate structure (2) to squeeze the sand (a).

6. The sand and gravel screening device for building construction according to claim 5, characterized in that: The fixed plate structure (3) includes a fixed groove (31) provided on the inner wall of the screening box (11), an installation rod (32) whose end is connected to the fixed groove (31), and an extrusion plate (33) provided on the end of the installation rod (32) near the coarse screen (12).

7. A sand and gravel screening device for building construction according to claim 6, characterized in that: The mounting rod (32) is rotatably connected to the fixing groove (31); the fixing plate structure (3) also includes a stop bar (34) disposed on the inner wall of the screening box (11) and located on the side end of the mounting rod (32) away from the coarse sand discharge outlet (14).

8. A sand and gravel screening device for building construction according to claim 6, characterized in that: The extrusion plate (33) has a weight reduction cavity (331) inside.

9. A sand and gravel screening device for building construction according to claim 6, characterized in that: The fixed plate structure (3) also includes a second bristle (35) disposed on the surface of the extrusion plate (33) near the coarse screen (12).

10. A sand and gravel screening device for building construction according to claim 4, characterized in that: The drive track (251) is provided with dustproof bristles (254).

Images