Sand screening machine for construction engineering

Abstract

This utility model relates to a sand screening machine for construction engineering, including a frame, a screen mounted on the frame, a funnel-shaped feeding port (larger at the top and smaller at the bottom) above the screen, a spiral stirring blade inside the feeding port, the spiral stirring blade being arranged along the central axis of the feeding port and connected to a first power source, and at least one layer of screen below the feeding port. Due to the above design, this sand screening machine for construction engineering can efficiently screen sand, and has advantages such as reasonable structure, high screening efficiency, and long service life.

Description

Technical Field

[0001] This utility model relates to the field of construction engineering technology, specifically to a sand screening machine for construction engineering. Background Technology

[0002] In the construction process, sand and gravel are fundamental building materials, and their quality directly affects the overall performance and safety of the project. Sand screening machines, as core equipment for sand and gravel grading, have some inconveniences in practical applications.

[0003] Traditional sand screening machines typically use a straight-cylinder open feed inlet. Due to prolonged accumulation of sand or high humidity, sand easily clumps and hardens, piling up at the feed inlet after being fed in, failing to achieve uniform dispersion and resulting in low screening efficiency. While some machines incorporate a mixing structure, the fixed pitch of the mixing components makes it difficult to effectively disperse materials with different properties (such as wet sand exhibiting agglomeration). Agglomerates remain when material enters the screening area, easily causing screen blockage and affecting screening accuracy and continuity. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a sand screening machine for construction engineering, so as to solve the problem that existing sand screening machines are unable to effectively disperse materials with different characteristics (such as wet sand with agglomeration), and that agglomerates still exist when the material enters the screening area, which easily causes screen hole blockage and affects screening accuracy and continuity.

[0005] This utility model is achieved through the following technical solution:

[0006] A sand screening machine for construction engineering includes a frame, on which a screen is provided. Above the screen is a funnel-shaped feeding port that is wider at the top and narrower at the bottom. Inside the feeding port is a spiral stirring blade. The spiral stirring blade is arranged along the central axis of the feeding port and connected to a first power source. Below the feeding port is at least one layer of screen.

[0007] Furthermore, the spiral stirring blade includes a central shaft and spiral blades. The pitch of the spiral blades gradually decreases from the top to the bottom of the feeding port, and the distance between the outer diameter of the blades and the inner wall of the feeding port is maintained at 5-10 cm.

[0008] Furthermore, the inner wall of the feeding port is provided with a removable wear-resistant liner, and the surface of the liner is provided with a guide strip with axial protrusions, the guide strip being consistent with the spiral direction of the spiral stirring blade.

[0009] Furthermore, the screen is provided with multiple layers, all of which are detachably connected to the frame and arranged sequentially from bottom to top. In each pair of adjacent screens, the screen opening of the upper screen is larger than that of the lower screen.

[0010] Furthermore, an eccentric shaft and a second power source are also provided below the screen. The eccentric shaft is located below the screen, and the protrusions on the eccentric shaft abut against the lower side of the screen. The second power source is mounted on the frame, and the output shaft of the second power source is fixedly connected to one end of the eccentric shaft, while the other end of the eccentric shaft is connected to the frame. When the second power source drives the eccentric shaft to rotate, the eccentric shaft can impact the lower side of the screen, causing the screen to vibrate.

[0011] Furthermore, the eccentric shaft includes a shaft and a convex strip. One end of the shaft is fixedly connected to the output shaft of the second power source, and the other end of the shaft is connected to the frame. The convex strip is connected to the shaft and abuts against the lower side of the screen.

[0012] Furthermore, the eccentric shaft has multiple protrusions arranged circumferentially along the axis of the shaft.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The synergistic effect of the funnel-shaped feeding port and the spiral mixing blades: The funnel-shaped feeding port, with its larger upper section and smaller lower section, guides the material to naturally converge towards the center. Combined with the spiral mixing blades arranged along the central axis, the material is forcibly dispersed by the primary power source. The pitch of the spiral blades gradually decreases from top to bottom, causing the material to be progressively compressed and crushed during its downward movement, effectively breaking up sand agglomerates. Simultaneously, the outer diameter of the blades maintains a 5-10cm gap from the inner wall of the feeding port, avoiding rigid contact between the blades and the equipment's inner wall, thus reducing energy consumption and mechanical wear while ensuring effective mixing.

[0015] 2. Multi-level screen gradient screening: The screen mesh size decreases gradually from top to bottom, forming a particle size gradient screening system. It can achieve multi-level screening of sand (coarse, medium, and fine) in one step, which greatly improves screening efficiency and accuracy compared with traditional single-layer screens.

[0016] 3. Eccentric Shaft Vibration Anti-Clogging Mechanism: The convex strips on the eccentric shaft periodically impact the lower side of the screen under the drive of the second power source, causing the screen to vibrate at high frequency and micro-amplitude, effectively preventing fine sand particles from clogging the screen holes. Multiple convex strips impact in sequence to form a uniform vibration load, avoiding local stress concentration on the screen. Compared with the traditional eccentric wheel vibration structure, the vibration energy distribution is more uniform, and the screening stability is better.

[0017] 4. Durability of the wear-resistant liner lifting equipment: The removable wear-resistant liner on the inner wall of the feeding port is made of wear-resistant materials such as high manganese steel. When the liner wears to the critical state, it can be quickly disassembled and replaced without replacing the entire feeding port component, thus reducing maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a sand screening machine for construction engineering according to this utility model;

[0019] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is a cross-sectional view of a sand screening machine for construction engineering according to this utility model.

[0021] In the diagram: 1. Frame; 2. Feed inlet; 21. First power source; 211. Central shaft; 212. Spiral blade; 22. Wear-resistant liner; 221. Guide bar; 3. Screen; 31. Second power source; 32. Eccentric shaft; 321. Protrusion. Detailed Implementation

[0022] Typical embodiments embodying the features and advantages of this utility model will be specifically described in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0023] In the description of this application, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure 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 application.

[0024] This utility model provides a sand screening machine for construction engineering, such as... Figure 1-3 As shown, the machine includes a frame 1, which is welded from steel and has a rectangular frame structure, providing sufficient strength and stability. A screen 3, which is a woven metal mesh, is installed on the frame 1.

[0025] like Figure 1 , Figure 3 As shown, a funnel-shaped feeding port 2, wider at the top and narrower at the bottom, is provided above the screen 3. The feeding port 2 is made of metal sheet, and its axis is perpendicular to the screen 3. A removable wear-resistant liner 22 is provided on the inner wall of the feeding port 2. The wear-resistant liner 22 can be made of high manganese steel and is fixed to the inner wall of the feeding port 2 by bolts. Specifically, the wear-resistant liner 22 has through holes, and the inner wall of the feeding port 2 has screw holes. This invention also includes bolts, which pass through the through holes and are screwed into the screw holes. A guide strip 221 with axial protrusions 321 is provided on the surface of the wear-resistant liner 22. The guide strip 221 is aligned with the spiral direction of the spiral stirring blades.

[0026] Please refer to Figure 3 The feeding port 2 is equipped with a spiral stirring blade, which includes a central shaft 211 and spiral blades 212. The pitch of the spiral blades 212 gradually decreases from the top to the bottom of the feeding port 2, and the distance between the outer diameter of the blades and the inner wall of the feeding port 2 is maintained at 5-10 cm. A first power source 21 is installed at the top of the feeding port 2. The first power source 21 can be a motor, which is connected to the central shaft 211 of the spiral stirring blades via a coupling. With this structure, even wet sand that tends to agglomerate can be dispersed.

[0027] like Figure 1 , Figure 3 As shown, multiple layers of screens 3 are installed below the feeding port 2. These screens 3 are detachably connected to the frame 1 and arranged sequentially from bottom to top. In each pair of adjacent screens 3, the upper screen 3 has larger mesh openings than the lower screen 3. Specifically, the multiple screens 3 are fixed to the frame 1 by snap-fit ​​connections.

[0028] Please refer to Figure 3 The spiral mixing blades include a central shaft 211 and spiral blades 212. The pitch of the spiral blades 212 gradually decreases from the top to the bottom of the feeding port 2, and the distance between the outer diameter of the blades and the inner wall of the feeding port 2 is maintained at 5-10 cm. A removable wear-resistant liner 22, made of high-manganese steel, is installed on the inner wall of the feeding port 2 by bolts. The liner surface has guide strips 221 with axial protrusions 321, the guide strips 221 being aligned with the spiral direction of the spiral mixing blades. Throughout the screening process, the wear-resistant liner 22 effectively reduces material wear on the inner wall of the feeding port 2, extending the service life of the equipment. When the wear-resistant liner 22 is severely worn, it can be easily disassembled and replaced.

[0029] like Figure 2 As shown, an eccentric shaft 32 and a second power source 31 are provided under the screen 3. The second power source 31 can be a motor. The second power source 31 is installed on one side of the frame 1, and its output shaft is fixedly connected to one end of the eccentric shaft 32 through a coupling. The other end of the eccentric shaft 32 is connected to the frame 1 through a bearing.

[0030] Since the screen 3 has multiple layers, the eccentric shaft 32 is also provided with multiple shafts. A pulley can be provided on one end of the eccentric shaft 32 near the second power source 31. A belt is wound on the pulley, and the belt can drive the pulley to rotate. With this structure, one second power source 31 can drive multiple eccentric shafts 32 to rotate.

[0031] The eccentric shaft has at least two protrusions 321. When the eccentric shaft 32 rotates, the two protrusions 321 strike the lower side of the screen 3 in sequence to make the screen 3 vibrate.

[0032] like Figure 1-3As shown, when sand needs to be screened, the first power source 21 and the second power source 31 are activated. Sand is fed into the feed port 2 from the top. Since the feed port 2 is funnel-shaped, the sand will naturally gather towards the center. The first power source 21 drives the spiral mixing blades to rotate. The pitch of the spiral blades 212 gradually decreases from the top to the bottom of the feed port 2, so that the sand is subjected to increasing compressive force as it moves downward, and the clumps of sand are better dispersed. At the same time, the guide strips 221 on the inner wall of the feed port 2 are aligned with the spiral direction of the spiral mixing blades, which can guide the sand to move downward along the spiral direction, preventing the sand from accumulating in the feed port 2 and improving the sand conveying efficiency.

[0033] The sand, initially dispersed by the spiral mixing blades, falls from the bottom of the feed inlet 2 onto the uppermost screen 3. Because the upper screen 3 has larger openings, larger sand particles remain on the screen 3, while smaller particles pass through and fall onto the lower screen 3. The second power source 31 drives the eccentric shaft 32 to rotate. During rotation, the protrusions 321 on the eccentric shaft 32 sequentially impact the lower surface of the screen 3, causing it to vibrate. This vibration prevents clogging of the screen openings and improves screening efficiency.

[0034] Furthermore, the sieve plate can be installed obliquely on the frame 1. The lengths of the multiple sieves 3 decrease sequentially from bottom to top. The top sieve 3 is the longest, retaining the largest particle size of sand, and a container for collecting coarse sand can be placed below the sieve plate. The middle sieve 3 retains medium-sized sand, which is also collected in a container placed below the sieve plate. The bottom sieve 3 passes through the smallest particle size of sand and is discharged from the outlet below the frame 1 for collection. For the multi-layer sieve structure, the sieve aperture size of each sieve 3 is different, gradually decreasing from top to bottom. The sand will pass through the sieves 3 with different aperture sizes in sequence, ultimately achieving the separation of sand of different particle sizes.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A sand screening machine for construction engineering, comprising a frame (1), a screen (3) is arranged on the frame (1), a feeding port (2) is arranged above the screen (3), characterized in that: The feeding port (2) is funnel-shaped with a larger top and a smaller bottom and is equipped with a spiral stirring blade inside. The spiral stirring blade is arranged along the central axis of the feeding port (2) and connected to a first power source (21). The spiral stirring blade includes a central shaft (211) and a spiral blade (212). The pitch of the spiral blade (212) gradually decreases from the top to the bottom of the feeding port (2), and the distance between the outer diameter of the blade and the inner wall of the feeding port (2) is maintained at 5-10cm.

2. A sand screening machine for construction work as claimed in claim 1 wherein: The inner wall of the feeding port (2) is provided with a removable wear-resistant liner (22), and the surface of the liner is provided with a guide strip (221) with an axial protrusion (321), and the guide strip (221) is consistent with the spiral direction of the spiral stirring blade.

3. A sand screening machine for construction work as claimed in claim 1 wherein: The screen (3) is provided with multiple layers. All multiple screens (3) can be detachably connected to the frame (1) and arranged in sequence from bottom to top. In each pair of adjacent screens (3), the screen hole of the upper screen (3) is larger than that of the lower screen (3).

4. A sand screening machine for construction work as claimed in claim 1 wherein: An eccentric shaft (32) and a second power source (31) are also provided below the screen (3), and the eccentric shaft (32) is located below the screen (3); The second power source (31) is mounted on the frame (1), and the output shaft of the second power source (31) is fixedly connected to one end of the eccentric shaft (32), while the other end of the eccentric shaft (32) is connected to the frame (1). When the second power source (31) drives the eccentric shaft (32) to rotate, the eccentric shaft (32) can strike the lower side of the screen (3) to make the screen (3) vibrate.

5. A sand screening machine for construction work as claimed in claim 4 wherein: The eccentric shaft includes a shaft and a protrusion (321). One end of the shaft is fixedly connected to the output shaft of the second power source (31), and the other end of the shaft is connected to the frame (1). The protrusion (321) is connected to the shaft and abuts against the lower side of the screen (3).

6. A sand screening machine for construction work as claimed in claim 5 wherein: The eccentric shaft (32) has multiple protrusions (321), which are arranged circumferentially along the axis of the shaft.

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