Construction waste recycled aggregate screening device

Abstract

The utility model relates to screening device technical field especially relates to a kind of construction waste recycled aggregate screening device, including first conveyor belt and second conveyor belt and fan screening assembly, the second conveyor belt is at the output end of first conveyor belt, for receiving the construction waste aggregate conveyed by first conveyor belt, the second conveyor belt is inside the shell of cube, the shell has first output and second output respectively in the both ends of second conveyor belt extension direction, the airflow output direction of fan screening assembly is contrary to the direction of second conveyor belt conveying construction waste aggregate, by setting first conveyor belt, second conveyor belt and fan screening assembly, it can be realized that the construction waste aggregate conveyed on first conveyor belt is conveyed to second conveyor belt suspension, wind selection is carried out by fan screening assembly, to avoid the problem that the weight of material is pressed to the weight of material in the process of wind selection, leading to the problem that part of lightweight material cannot be screened out.

Description

Technical Field

[0001] This utility model relates to the field of screening device technology, and in particular to a screening device for recycled aggregates from construction waste. Background Technology

[0002] Screening of recycled aggregates from construction waste is a crucial step in the construction waste recycling process that significantly impacts the quality of the final product, directly affecting its purity. Existing screening equipment includes particle size screening, screening of ferrous and concrete materials, screening of wood and concrete blocks, and screening of lightweight materials such as plastic film and concrete blocks. Different screening devices achieve different screening effects. For example, particle size screening typically uses screens with specific apertures; screening of ferrous and concrete blocks usually employs magnetic sieving; screening of wood and concrete blocks often uses flotation; and screening of plastic film and other lightweight materials often involves different methods. The screening of lightweight materials such as plastic films and concrete blocks is carried out using air classification. The existing air classification method screens lightweight materials such as plastic films and concrete blocks. The air classification device includes a conveyor belt and a negative pressure fan assembly placed above the conveyor belt. The negative pressure fan assembly adsorbs the lightweight materials in the construction waste aggregate and separates them from the heavier materials such as concrete. The problem with the existing air classification device is that the range of the negative pressure area is limited during the air classification process. Some lightweight materials may be pressed under the heavier materials, making them unable to be adsorbed and separated. Based on this problem, it is necessary to design a screening device for recycled aggregates from construction waste to solve the above problems. Utility Model Content

[0003] This utility model provides a screening device for recycled aggregates from construction waste, which uses a blower screening component to perform air separation, thereby avoiding the problem that heavier materials press down on lighter materials during the air separation process, resulting in some lightweight materials not being screened out.

[0004] The technical problem solved by this utility model is achieved by the following technical solution:

[0005] This utility model provides a screening device for recycled aggregate from construction waste, including a first conveyor belt, a second conveyor belt, and a fan screening assembly. The second conveyor belt is located at the output end of the first conveyor belt and is used to receive the construction waste aggregate conveyed by the first conveyor belt. The second conveyor belt is located inside a cubic shell. The shell has a first output port and a second output port at both ends of the extension direction of the second conveyor belt, respectively. The airflow output direction of the fan screening assembly is opposite to the direction in which the second conveyor belt conveys the construction waste aggregate.

[0006] Preferably, the second conveyor belt is located below the first conveyor belt, and the output end of the first conveyor belt is provided with a guide cylinder that communicates with the interior of the shell on the outer surface of the second conveyor belt.

[0007] Preferably, the housing includes a U-shaped bracket with a U-shaped cross-section and a cover for closing the top of the U-shaped bracket.

[0008] Preferably, the fan screening assembly includes a positive pressure fan, an air outlet pipe at the output end of the positive pressure fan, and a flow guide at the output end of the air outlet pipe, wherein the flow guide is oriented in the airflow output direction.

[0009] Preferably, the output end of the flow guide is provided with a mesh cover.

[0010] Preferably, the distance between the conveying plane of the second conveyor belt and the inner top wall of its outer casing is not less than a multiple of the maximum particle size of the conveyed construction waste aggregate.

[0011] The beneficial effects of this utility model are: by setting up a first conveyor belt, a second conveyor belt and a fan screening component, the construction waste aggregate conveyed on the first conveyor belt can be air-separated by the fan screening component when it is suspended on the second conveyor belt. This avoids the problem that heavier materials press down on lighter materials during the air separation process, resulting in some lightweight materials not being screened out.

[0012] The gap between the first and second conveyor belts allows the construction waste aggregate on the first conveyor belt to impact the second conveyor belt, causing the lightweight material adhering to the heavier waste aggregate to detach, thus improving the air separation effect of the lightweight material. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a first-view perspective three-dimensional structural diagram of the prior art of this utility model;

[0015] Figure 2 This is a first cross-sectional view of the prior art of this utility model;

[0016] Figure 3 This is a second sectional view of the prior art of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram from a first-view perspective of the present invention;

[0018] Figure 5 This is a two-dimensional structural diagram of the present invention from a second perspective;

[0019] Figure 6 This is a first sectional view of the present invention;

[0020] Figure 7 This is a second sectional view of the present invention.

[0021] In the diagram, 1. First conveyor belt; 2. Funnel; 3. Shell; 4. Negative pressure fan; 5. Connecting pipe; 6. Second conveyor belt; 7. Adsorption hole; 8. Motor; 9. Brush; 10. U-shaped bracket; 11. Cover; 12. Guide cylinder; 13. Positive pressure fan; 14. Air outlet pipe; 15. Flow guide hood; 16. First output port; 17. Second output port; 18. Mesh cover. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0023] refer to Figures 1-3An existing construction waste recycled aggregate screening device includes a first conveyor belt 1 for conveying construction waste aggregate, which is placed on a U-shaped bracket 10. A funnel 2 is installed at one end of the U-shaped bracket 10, and the other end (the end without the funnel 2) is the output end of the construction waste aggregate. A blower screening assembly is also installed above the first conveyor belt 1 for air-separating and screening the construction waste aggregate conveyed on the first conveyor belt 1. The blower screening assembly includes an outer cover (with an opening at the bottom) located above the U-shaped bracket 10, and inside the outer cover... A second conveyor belt 6 with adsorption holes 7 is provided. One side of the outer casing is connected to the negative pressure fan 4 through a connecting pipe 5. In the specific operation process, the first conveyor belt 1, the second conveyor belt 6, and the negative pressure fan 4 are all running. When the construction waste aggregate on the first conveyor belt 1 is conveyed (the conveying direction is from the end with the funnel 2 to the end without the funnel 2), the negative pressure fan 4 creates a negative pressure inside the outer casing. Air enters the outer casing through the adsorption holes 7 on the second conveyor belt 6, driving the lightweight materials in the construction waste aggregate towards the adsorption holes 7 and moving with the second conveyor belt. 6. With the second conveyor belt 6 in motion, friction causes the lightweight material to move along the second conveyor belt 6 to one side of the first conveyor belt 1, thus achieving the effect of screening lightweight material from construction waste. At the output end of the second conveyor belt 6, a brush 9 is also installed. Driven by a motor 8, the brush 9 rotates to remove the lightweight material adsorbed at the output end of the second conveyor belt 6, causing it to fall to one side of the conveyor belt. The above describes the principle of existing lightweight material screening in construction waste aggregates. However, this method has the following drawbacks during the screening process: Firstly, due to the partial... Firstly, the lighter materials are pressed down by the heavier construction waste aggregate, preventing them from being adsorbed by the negative pressure and resulting in incomplete screening. Secondly, the negative pressure zone generated by the negative pressure fan 4 is relatively short. Some of the lighter materials (which have an initial velocity along the direction of the first conveyor belt 1 and continue to move forward along the direction of the first conveyor belt 1 while being adsorbed upward by the negative pressure) may detach from the negative pressure zone when they rise to half their height, causing them to fall back into the construction waste aggregate. Based on this situation, it is necessary to design a construction waste recycled aggregate screening device to solve the above problems.

[0024] refer to Figures 4-7This utility model provides a screening device for recycled aggregate from construction waste, comprising a first conveyor belt 1, a second conveyor belt 6, and a fan screening assembly. The second conveyor belt 6 is located at the output end of the first conveyor belt 1 and is used to receive the construction waste aggregate conveyed by the first conveyor belt 1. The second conveyor belt 6 is located inside a cubic shell 3. The shell 3 has a first output port 16 and a second output port 17 at both ends of the extension direction of the second conveyor belt 6, respectively. The airflow output direction of the fan screening assembly is opposite to the direction in which the construction waste aggregate is conveyed by the second conveyor belt 6. In the specific working process, the construction waste aggregate conveyed by the first conveyor belt 1 moves along the conveying direction of the first conveyor belt 1. When it moves to the output end of the first conveyor belt 1, it falls onto the second conveyor belt 6. The second conveyor belt 6 is installed in the cubic shell 3, which is enclosed by a cover 11 at the top of the existing U-shaped frame. The construction waste that falls onto the upper surface of the second conveyor belt 6... The aggregate continues to be conveyed along the second conveyor belt 6. This invention installs a fan screening component (positive pressure) at one end of the housing 3. The airflow output direction of the fan screening component is opposite to the direction in which the construction waste aggregate is conveyed by the second conveyor belt 6. This ensures that the heavier materials in the construction waste aggregate conveyed on the second conveyor belt 6 continue to be conveyed along the conveying direction of the second conveyor belt 6, while the lighter materials are blown in the opposite direction to the second conveyor belt 6 by the airflow. That is, the second conveyor belt 6 has two outlets. One outlet is located at the end of the conveying direction of the second conveyor belt 6 and is the outlet for the heavier materials of the construction waste aggregate. The other outlet is used to discharge the lighter materials from this position by the airflow. The main function of the housing 3 is to make the airflow generated by the positive pressure fan 13 more concentrated on the conveying plane of the second conveyor belt 6, and at the same time to guide the light materials and prevent them from scattering everywhere.

[0025] Furthermore, the second conveyor belt 6 is located below the first conveyor belt 1. The output end of the first conveyor belt 1 is equipped with a guide cylinder 12, which communicates with the interior of the shell 3 on the outer surface of the second conveyor belt 6. Because the second conveyor belt 6 is below the first conveyor belt 1, when the construction waste aggregate on the first conveyor belt 1 falls onto the second conveyor belt 6, an impact effect occurs. This causes some of the lighter aggregate adhering to the heavier aggregate to separate upon impact. The separated lighter aggregate is then more easily carried by the airflow and detached from the construction waste aggregate. Specifically, some of the construction waste aggregate at the output end of the first conveyor belt 1 also impacts the guide cylinder 12, achieving separation of the lighter and heavier aggregates. It should be further noted that the second conveyor belt 6 being located below the first conveyor belt 1 also has the effect that the construction waste aggregate on the first conveyor belt 1 undergoes a descent process when transferred to the second conveyor belt 6. During this descent, the lighter aggregate is not pressed down by the gravity of the heavier aggregate and is more easily blown away and separated by the fan.

[0026] Furthermore, the shell 3 mentioned above is formed by the U-shaped bracket 10 and the cover 11 at the top of the U-shaped bracket 10. In the specific design process, the shell 3 formed by combining the U-shaped bracket and the cover 11 on the first conveyor belt 1 can also be used to relatively enclose the outside of the first conveyor belt 1.

[0027] Furthermore, the fan screening assembly of this utility model includes a positive pressure fan 13, an air outlet pipe 14 at the output end of the positive pressure fan 13, and a flow guide shroud 15 at the output end of the air outlet pipe 14. The flow guide shroud 15 points in the direction of airflow output. The positive pressure fan 13 sprays airflow through the air outlet pipe 14 and through the flow guide shroud 15. The sprayed airflow moves in the opposite direction to the output direction of the second conveyor belt 6, thereby achieving the separation of light materials and heavy materials.

[0028] Furthermore, a mesh cover 18 is provided at the output end of the flow guide 15 to prevent some of the construction waste aggregate from entering the interior of the flow guide 15 when the second conveyor belt 6 is conveying too fast. It should be further noted that when the second conveyor belt 6 is conveying construction waste aggregate, the thickness of the construction waste aggregate on the second conveyor belt 6 should not be too thick, and single-layer conveying is preferred (i.e., there is no stacking or the stacking is very low). Moreover, the particle size of the conveyed construction waste aggregate should not be too large. Preferably, the distance between the conveying plane of the second conveyor belt 6 and the inner top wall of its own outer shell 3 should not be less than 5 times the maximum particle size of the conveyed construction waste aggregate.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above-described embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A screening device for recycled aggregate from construction waste, comprising a first conveyor belt (1), a second conveyor belt (6), and a blower screening assembly, characterized in that, The second conveyor belt (6) is located at the output end of the first conveyor belt (1) and is used to receive the construction waste aggregate conveyed by the first conveyor belt (1). The second conveyor belt (6) is located inside the cubic shell (3). The shell (3) has a first output port (16) and a second output port (17) at both ends of the extension direction of the second conveyor belt (6). The airflow output direction of the fan screening assembly is opposite to the direction in which the second conveyor belt (6) conveys the construction waste aggregate.

2. The construction waste recycled aggregate screening device according to claim 1, characterized in that, The second conveyor belt (6) is located below the first conveyor belt (1). The output end of the first conveyor belt (1) is provided with a guide cylinder (12) which communicates with the interior of the shell (3) on the outer surface of the second conveyor belt (6).

3. The construction waste recycled aggregate screening device according to claim 1, characterized in that, The housing (3) includes a U-shaped bracket (10) with a U-shaped cross-section and a cover (11) for closing the top of the U-shaped bracket (10).

4. The construction waste recycled aggregate screening device according to claim 1, characterized in that, The fan screening assembly includes a positive pressure fan (13), an air outlet pipe (14) at the output end of the positive pressure fan (13), and a flow guide (15) at the output end of the air outlet pipe (14), wherein the flow guide (15) is oriented in the direction of airflow output.

5. A screening device for recycled aggregates from construction waste according to claim 4, characterized in that, The output end of the flow guide (15) is provided with a mesh cover (18).

6. A screening device for recycled aggregates from construction waste according to claim 2, characterized in that, The distance between the conveying plane of the second conveyor belt (6) and the inner top wall of its own outer shell (3) is not less than 5 times the maximum particle size of the conveyed construction waste aggregate.

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