Vibrating screen capable of reducing powder content

Abstract

The utility model discloses a vibrating screen capable of reducing powder content, which comprises a vibrating screen main body, a screen surface is arranged on the vibrating screen main body, a reserved gap is arranged below the screen surface, an air ejector pipe is arranged on the reserved gap, the air ejector pipe is connected with an air inflation unit, a plurality of air nozzles are arranged on the air ejector pipe, and the air nozzles are communicated with the air inflation unit. When the air inflation unit is inflated, the air nozzles form air flow on the screen face, and the vibrating screen body is connected with a negative pressure dust remover. The reserved gap is formed below the screen face, the air spraying pipe in the reserved gap can spray air flow out of the air spraying nozzle by being connected with the air inflation unit, so that high-pressure air flow is formed on the screen face, the flow speed of the air flow can be increased through the air spraying nozzle, and then the blowing capacity of the air flow to powder in gravel aggregate can be improved; therefore, the powder wrapping condition in the gravel aggregate is reduced, the powder content in the gravel aggregate is reduced, and in the using process, the device can adapt to different working conditions to adjust the air volume and the air flow.

Description

Technical Field

[0001] This utility model relates to the field of vibrating screen technology, and in particular to a vibrating screen for reducing powder content. Background Technology

[0002] With economic and social development, the engineering industry has increasingly higher requirements for concrete. High-quality sand and gravel aggregates are beneficial to improving the cost-effectiveness of precast concrete. The problem of high powder content (also known as powder coating) in sand and gravel aggregates is widespread. Traditionally, controlling the powder content of vibrating screens usually involves washing with water, which not only increases production costs and process complexity, but also makes the mud cake after washing difficult to handle, seriously affecting environmental safety.

[0003] For example, publication number "CN222402286U" discloses "a screen box structure for a vibrating screen of sand and gravel aggregates," including an outer box, an inner box, a fixing plate, an L-shaped fixing frame, and a flexible frame. The outer box has openings at both ends and the top. Several damping strips are fixed at equal intervals on the inner wall of the outer box. The inner box is located inside the outer box, with the damping strips fixed to the outside of the inner box. Fixing plates are fixed to both sides of the inner wall of the inner box. Several dampers are fixed at equal intervals along a center line parallel to the long side at the top of the L-shaped fixing frame. All dampers at the top of the same L-shaped fixing frame are jointly fixed to the L-shaped fixing frame. A flexible frame is movably connected to the top of the inner box away from the openings. However, in practical applications, this type of vibrating screen causes powder in the sand and gravel aggregates to form mud cakes after washing, which are difficult to handle and affect the working efficiency of the vibrating screen. Summary of the Invention

[0004] In view of the problem mentioned in the background art that the mud cake after washing is difficult to handle and affects work efficiency, this utility model provides a vibrating screen that reduces the powder content. It can make the wind pass through the screen surface of the vibrating screen, effectively alleviate the powder coating of sand and gravel aggregates, and control the powder content of sand and gravel aggregates.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A vibrating screen for reducing powder content includes a vibrating screen body, a screen surface on the vibrating screen body, a reserved gap below the screen surface, an air jet pipe placed in the reserved gap, an air inflation unit connected to the air jet pipe, and a plurality of air jet nozzles on the air jet pipe. When the air inflation unit is inflated, the air jet nozzles form an airflow on the screen surface. The vibrating screen body is connected to a negative pressure dust collector. A reserved gap is provided below the screen surface. An air jet pipe within this gap can be connected to an air-filling unit to eject airflow from the nozzle, creating a high-pressure airflow on the screen surface. The nozzle increases the airflow velocity, thereby enhancing the airflow's ability to remove powder from the sand and gravel aggregate, reducing powder coating and lowering the powder content. Furthermore, a negative pressure dust collector generates a negative pressure effect, allowing the blown powder to quickly leave the aggregate, alleviating powder coating. High powder content in sand and gravel aggregate can lead to increased dust generation during production, posing a safety risk to equipment and personnel. Therefore, the negative pressure dust collector in this application suppresses powder dispersion, protecting worker safety. The high-pressure gas generated by the air jet pipe further reduces the powder content, preventing mud cake formation during washing. Moreover, if the aggregate contains sulfides or other corrosive components, a high powder content exacerbates corrosion, negatively impacting the durability of prestressed concrete.

[0007] Preferably, the vibrating screen body is provided with several screening layers, each of which is equipped with a screen surface and an air jet pipe. Having multiple screening layers on the vibrating screen improves screening efficiency. Furthermore, the presence of a screen surface and an air jet pipe on each screening layer ensures that the high-speed airflow effectively cleans each screen surface, guaranteeing thorough powder removal from each screening layer and thus improving processing efficiency.

[0008] Preferably, a plurality of air jet pipes are provided in the reserved gap along the extension direction of the screen surface. The multiple air jet pipes are arranged in the same direction as the extension direction of the screen surface, thereby ensuring a more uniform airflow direction on the screen surface, guaranteeing that the sand and gravel aggregates on the screen surface are evenly dispersed and coated with powder, thus improving production quality.

[0009] Preferably, the vibrating screen body is provided with mounting holes, and the air jet pipe is rotatably connected to the mounting holes. The air jet pipe can rotate relative to the vibrating screen body to change the direction of the air jet nozzle. The air jet pipe is rotatably connected to the vibrating screen body, wherein the mounting holes are provided on the vibrating screen body, and the shape of the mounting holes is adapted to the air jet pipe, so that the air jet pipe can rotate within the mounting holes. This allows the direction of the air jet nozzle to be changed by rotating the air jet pipe during operation, thereby changing the air outlet direction of the air jet pipe, thus enabling flexible operation.

[0010] Preferably, the jet pipe is equipped with a positioning baffle. When the jet pipe is connected to the mounting hole, the positioning baffle abuts against the vibrating screen body. The positioning baffle allows the jet pipe to be positioned within the mounting hole, ensuring that the axial position of the jet pipe relative to the vibrating screen body remains constant during rotation. This allows the jet pipe to change only the air outlet direction, ensuring the stability of the angle adjustment.

[0011] Preferably, the vibrating screen body includes side plates on both sides, with a screen surface disposed between the side plates, and the air jet pipe connected in series between the two side plates. The vibrating screen body includes side plates, which serve as supporting bodies. The various screen surfaces are connected in the middle of the side plates, ensuring stable connection of the screen surfaces. The air jet pipe is connected in series between the two side plates, ensuring the connection stability of the air jet pipe.

[0012] Preferably, the vibrating screen body is connected to a drive unit, which can drive the vibrating screen body to vibrate. The drive unit is installed inside the vibrating screen body, enabling the entire vibrating screen body to vibrate, thereby allowing the screen surface to vibrate and screen.

[0013] Preferably, the drive unit is located in the middle of the vibrating screen body. Positioning the drive unit in the middle of the vibrating screen allows it to uniformly drive the entire vibrating screen body to vibrate, avoiding uneven force distribution on the vibrating screen body.

[0014] Preferably, a support spring is connected to the vibrating screen body, with one end of the support spring abutting against the vibrating screen body and the other end connected to a fixed base. By connecting the support spring to the vibrating screen body and the fixed base through the support spring, the vibrating screen body can be suspended on the fixed base. After the drive unit operates, the vibrating screen body is subjected to force and vibrates through the support spring.

[0015] Preferably, the vibrating screen body is provided with a mounting base, which includes a supporting reinforcing rib and a supporting plate. A connecting pin is provided on the side of the supporting plate near the supporting spring. The supporting reinforcing rib can improve the supporting strength, and the pin on the supporting plate can engage with the supporting spring to limit the position of the supporting spring and ensure its stability during the vibration of the vibrating screen body.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) It enables wind to pass through the screen surface of the vibrating screen, effectively alleviating the powder coating of sand and gravel aggregates and controlling the powder content of sand and gravel aggregates.

[0018] (2) It can change the direction of air output during the working process, making the powder blowing operation more flexible and uniform, and improving production quality and efficiency. Attached Figure Description

[0019] Figure 1 This is the first isometric drawing of this utility model.

[0020] Figure 2 This is a partial front view of the present invention.

[0021] Figure 3 This is the second isometric drawing of this utility model.

[0022] Figure 4 This is a partial isometric view of Example 3.

[0023] In the picture:

[0024] 1. Vibrating screen body, 11. Reserved gap, 12. Screening layer, 13. Side plate, 131. Mounting hole;

[0025] 2 sieve surfaces;

[0026] 3 jet pipes, 31 jet nozzles, 32 positioning baffles;

[0027] 4 drive units;

[0028] 5. Support spring, 51. Support reinforcing rib, 52. Support plate, 53. Shaft pin. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1:

[0031] like Figure 1As shown, a vibrating screen for reducing powder content includes a vibrating screen body 1, a screen surface 2 on the vibrating screen body 1, a reserved gap 11 below the screen surface 2, an air jet pipe 3 placed on the reserved gap 11, an air inflation unit connected to the air jet pipe 3, and a plurality of air jet nozzles 31 on the air jet pipe 3. When the air inflation unit is inflated, the air jet nozzles 31 form an airflow on the screen surface 2. The vibrating screen body 1 is connected to a negative pressure dust collector.

[0032] In building materials, sand and gravel aggregates are crucial components for enhancing the strength and toughness of concrete. However, excessive coating with additives can lead to several major problems: Thick powder increases the weight of the aggregates, increasing transportation and handling costs and potentially exceeding budget, thus impacting project economics. Excessive surface additives may hinder the full reaction between internal particles and water, weakening concrete strength. Excessive powder can loosen the aggregate structure, hindering subsequent construction and use. It may also cause chemical reactions with internal particles or dissolve in water, affecting the stability of the mixture and reducing seismic resistance. Excessive powder coating makes precise control during production more difficult, leading to batch-to-batch quality inconsistencies and affecting consistency and reliability. Furthermore, existing technologies involving rewashing the powder with water can produce mud cakes, which are cumbersome to handle and increase production costs.

[0033] Therefore, in this embodiment, a reserved gap 11 is provided below the screen surface 2. The jet pipe 3 in the reserved gap 11 can be connected to the air supply unit to spray air from the jet nozzle 31, thereby forming a high-pressure airflow on the screen surface 2. The jet nozzle 31 can increase the airflow velocity, thereby improving the airflow's ability to blow away powder in the sand and gravel aggregate, thus reducing the powder coating in the sand and gravel aggregate and lowering the powder content in the sand and gravel aggregate. Furthermore, the negative pressure dust collector can generate a negative pressure effect, which allows the blown powder to quickly leave the sand and gravel aggregate, alleviating the powder coating situation in the sand and gravel aggregate. Among them, sand and gravel aggregate with a high powder content may cause more dust to be generated during the production process, which may have a certain impact on the safety of equipment and operators. Therefore, the negative pressure dust collector in this application can suppress the flying of powder, thereby protecting the safety of workers. Furthermore, the high-pressure gas generated by the jet pipe 3 can reduce the powder content in the sand and gravel aggregate, thereby avoiding the formation of mud cakes during water washing. If the sand and gravel aggregate contains sulfides or other easily corrosive components, the high powder content will exacerbate its corrosivity and negatively affect the durability of the prestressed concrete.

[0034] Example 2:

[0035] like Figure 1As shown, a vibrating screen for reducing powder content includes a vibrating screen body 1, a screen surface 2 on the vibrating screen body 1, a reserved gap 11 below the screen surface 2, an air jet pipe 3 placed on the reserved gap 11, an air inflation unit connected to the air jet pipe 3, and a plurality of air jet nozzles 31 on the air jet pipe 3. When the air inflation unit is inflated, the air jet nozzles 31 form an airflow on the screen surface 2. The vibrating screen body 1 is connected to a negative pressure dust collector. A reserved gap 11 is provided below the screen surface 2. The jet pipe 3 in the reserved gap 11 can be connected to the air supply unit to spray air from the jet nozzle 31, thereby forming a high-pressure airflow on the screen surface 2. The jet nozzle 31 can increase the airflow velocity, thereby improving the airflow's ability to blow away powder in the sand and gravel aggregate, thus reducing the powder coating in the sand and gravel aggregate and lowering the powder content in the sand and gravel aggregate. Furthermore, the negative pressure dust collector can generate a negative pressure effect, which can allow the blown powder to leave the sand and gravel aggregate quickly, alleviating the powder coating situation in the sand and gravel aggregate. Among them, sand and gravel aggregate with high powder content may cause more dust to be generated during the production process, which may have a certain impact on the safety of equipment and operators. Therefore, the negative pressure dust collector in this application can suppress the flying of powder, thereby protecting the safety of workers. Furthermore, the high-pressure gas generated by the jet pipe 3 can reduce the powder content in the sand and gravel aggregate, thereby avoiding the formation of mud cakes during water washing. If the sand and gravel aggregate contains sulfides or other easily corrosive components, the high powder content will exacerbate its corrosivity and negatively affect the durability of the prestressed concrete.

[0036] like Figure 2 As shown, the vibrating screen body 1 is provided with several screening layers 12, each of which is equipped with a screen surface 2 and an air jet pipe 3. The presence of multiple screening layers 12 on the vibrating screen improves screening efficiency. Furthermore, the presence of a screen surface 2 and an air jet pipe 3 on each screening layer 12 ensures that the high-speed airflow effectively cleans each screen surface 2, guaranteeing thorough powder removal and thus improving processing efficiency.

[0037] like Figure 1 As shown, several air jet pipes 3 are provided on the reserved gap 11 along the extension direction of the screen surface 2. The multiple air jet pipes 3 are arranged in the same direction as the extension direction of the screen surface 2, so that the airflow direction on the screen surface 2 can be more uniform, ensuring that the sand and gravel aggregate on the screen surface 2 can be evenly blown and coated with powder, thereby improving the production quality.

[0038] like Figure 3As shown, the vibrating screen body 1 is provided with a mounting hole 131, and the air jet pipe 3 is rotatably connected in the mounting hole 131. The air jet pipe 3 can rotate relative to the vibrating screen body 1 to change the orientation of the air jet nozzle 31. The air jet pipe 3 is rotatably connected to the vibrating screen body 1, and the mounting hole 131 is provided in the vibrating screen body 1. The shape of the mounting hole 131 is adapted to the air jet pipe 3, so that the air jet pipe 3 can rotate in the mounting hole 131. Therefore, during operation, by rotating the air jet pipe 3, the orientation of the air jet nozzle 31 can be changed, thereby changing the air outlet direction of the air jet pipe 3, so as to enable flexible operation.

[0039] like Figure 3 As shown, a positioning baffle 32 is provided on the jet pipe 3. When the jet pipe 3 is connected in the mounting hole 131, the positioning baffle 32 abuts against the vibrating screen body 1. By providing the positioning baffle 32 on the jet pipe 3, the jet pipe 3 can be positioned on the mounting hole 131. Thus, during the rotation of the jet pipe 3, the axial position of the jet pipe 3 and the vibrating screen body 1 remains unchanged, so that the jet pipe 3 only changes the air outlet direction, ensuring the stability of the angle adjustment.

[0040] Example 3:

[0041] like Figure 1 As shown, a vibrating screen for reducing powder content includes a vibrating screen body 1, a screen surface 2 on the vibrating screen body 1, a reserved gap 11 below the screen surface 2, an air jet pipe 3 placed on the reserved gap 11, an air inflation unit connected to the air jet pipe 3, and a plurality of air jet nozzles 31 on the air jet pipe 3. When the air inflation unit is inflated, the air jet nozzles 31 form an airflow on the screen surface 2. The vibrating screen body 1 is connected to a negative pressure dust collector. A reserved gap 11 is provided below the screen surface 2. The jet pipe 3 in the reserved gap 11 can be connected to the air supply unit to spray air from the jet nozzle 31, thereby forming a high-pressure airflow on the screen surface 2. The jet nozzle 31 can increase the airflow velocity, thereby improving the airflow's ability to blow away powder in the sand and gravel aggregate, thus reducing the powder coating in the sand and gravel aggregate and lowering the powder content in the sand and gravel aggregate. Furthermore, the negative pressure dust collector can generate a negative pressure effect, which can allow the blown powder to leave the sand and gravel aggregate quickly, alleviating the powder coating situation in the sand and gravel aggregate. Among them, sand and gravel aggregate with high powder content may cause more dust to be generated during the production process, which may have a certain impact on the safety of equipment and operators. Therefore, the negative pressure dust collector in this application can suppress the flying of powder, thereby protecting the safety of workers. Furthermore, the high-pressure gas generated by the jet pipe 3 can reduce the powder content in the sand and gravel aggregate, thereby avoiding the formation of mud cakes during water washing. If the sand and gravel aggregate contains sulfides or other easily corrosive components, the high powder content will exacerbate its corrosivity and negatively affect the durability of the prestressed concrete.

[0042] like Figure 2 As shown, the vibrating screen body 1 is provided with several screening layers 12, each of which is equipped with a screen surface 2 and an air jet pipe 3. The presence of multiple screening layers 12 on the vibrating screen improves screening efficiency. Furthermore, the presence of a screen surface 2 and an air jet pipe 3 on each screening layer 12 ensures that the high-speed airflow effectively cleans each screen surface 2, guaranteeing thorough powder removal and thus improving processing efficiency.

[0043] like Figure 1 As shown, several air jet pipes 3 are provided on the reserved gap 11 along the extension direction of the screen surface 2. The multiple air jet pipes 3 are arranged in the same direction as the extension direction of the screen surface 2, so that the airflow direction on the screen surface 2 can be more uniform, ensuring that the sand and gravel aggregate on the screen surface 2 can be evenly blown and coated with powder, thereby improving the production quality.

[0044] like Figure 3 As shown, the vibrating screen body 1 is provided with a mounting hole 131, and the air jet pipe 3 is rotatably connected in the mounting hole 131. The air jet pipe 3 can rotate relative to the vibrating screen body 1 to change the orientation of the air jet nozzle 31. The air jet pipe 3 is rotatably connected to the vibrating screen body 1, and the mounting hole 131 is provided in the vibrating screen body 1. The shape of the mounting hole 131 is adapted to the air jet pipe 3, so that the air jet pipe 3 can rotate in the mounting hole 131. Therefore, during operation, by rotating the air jet pipe 3, the orientation of the air jet nozzle 31 can be changed, thereby changing the air outlet direction of the air jet pipe 3, so as to enable flexible operation.

[0045] like Figure 3 As shown, a positioning baffle 32 is provided on the jet pipe 3. When the jet pipe 3 is connected in the mounting hole 131, the positioning baffle 32 abuts against the vibrating screen body 1. By providing the positioning baffle 32 on the jet pipe 3, the jet pipe 3 can be positioned on the mounting hole 131. Thus, during the rotation of the jet pipe 3, the axial position of the jet pipe 3 and the vibrating screen body 1 remains unchanged, so that the jet pipe 3 only changes the air outlet direction, ensuring the stability of the angle adjustment.

[0046] like Figure 3 As shown, the vibrating screen body includes side plates 13 located on both sides, with screen surfaces 2 disposed between the side plates 13, and air jet pipes 3 connected in series between the two side plates 13. The vibrating screen body includes side plates 13, which serve as the supporting body. The screen surfaces 2 are connected to each other in the middle of the side plates 13, ensuring stable connection of the screen surfaces 2. The air jet pipes 3 are connected in series between the two side plates 13, ensuring the stability of the connection of the air jet pipes 3.

[0047] like Figure 3 As shown, the vibrating screen body 1 is connected to a drive unit 4, which can drive the vibrating screen body 1 to vibrate. The drive unit 4 is installed inside the vibrating screen body 1, and the drive unit 4 can drive the entire vibrating screen body 1 to vibrate, thereby enabling the screen surface 2 to vibrate and screen.

[0048] like Figure 3 As shown, the drive unit 4 is located in the middle of the vibrating screen body 1. By placing the drive unit 4 in the middle of the vibrating screen, the drive unit 4 can drive the entire vibrating screen body 1 to vibrate evenly, thus avoiding uneven force distribution on the vibrating screen body 1.

[0049] like Figure 4 As shown, a support spring 5 is connected to the vibrating screen body 1. One end of the support spring 5 abuts against the vibrating screen body 1, and the other end is connected to a fixed base. By connecting the support spring 5 to the vibrating screen body 1 and the fixed base through the support spring 5, the vibrating screen body 1 can be suspended on the fixed base. After the drive unit 4 is working, the vibrating screen body 1 is subjected to force and vibrates through the support spring 5.

[0050] like Figure 4 As shown, the vibrating screen body 1 is equipped with a mounting base, which includes a supporting reinforcing rib 51 and a supporting plate 52. A connecting pin 53 is provided on the side of the supporting plate 52 near the supporting spring 5. The supporting reinforcing rib 51 can improve the support strength. The pin 53 on the supporting plate 52 can be engaged with the supporting spring 5, thereby limiting the position of the supporting spring 5 and ensuring the stability of the supporting spring 5 during the vibration of the vibrating screen body 1.

Claims

1. A vibrating screen for reducing powder content, characterized in that, The device includes a vibrating screen body, a screen surface on the vibrating screen body, a reserved gap below the screen surface, an air jet pipe placed in the reserved gap, an air inflation unit connected to the air jet pipe, and several air nozzles on the air jet pipe. When the air inflation unit is inflated, the air nozzles form an airflow on the screen surface. The vibrating screen body is connected to a negative pressure dust collector.

2. The vibrating screen for reducing powder content according to claim 1, characterized in that, The vibrating screen body is provided with several screening layers, and each screening layer is provided with a screen surface and an air jet pipe.

3. A vibrating screen for reducing powder content according to claim 1, characterized in that, Several air jet pipes are provided on the reserved gap along the direction of extension of the screen surface.

4. A vibrating screen for reducing powder content according to claim 1, characterized in that, The vibrating screen body is provided with mounting holes, and the air jet pipe is rotatably connected in the mounting holes. The air jet pipe can rotate relative to the vibrating screen body to change the direction of the air jet nozzle.

5. A vibrating screen for reducing powder content according to claim 4, characterized in that, The jet pipe is equipped with a positioning baffle. When the jet pipe is connected to the mounting hole, the positioning baffle abuts against the vibrating screen body.

6. A vibrating screen for reducing powder content according to claim 1, characterized in that, The vibrating screen body includes side plates on both sides, a screen surface is provided between the side plates, and an air jet pipe is connected in series between the two side plates.

7. A vibrating screen for reducing powder content according to any one of claims 1-6, characterized in that, The vibrating screen body is connected to a drive unit, which can drive the vibrating screen body to vibrate.

8. A vibrating screen for reducing powder content according to claim 7, characterized in that, The drive unit is located in the middle of the vibrating screen body.

9. A vibrating screen for reducing powder content according to any one of claims 1-6, characterized in that, A support spring is connected to the main body of the vibrating screen. One end of the support spring abuts against the main body of the vibrating screen, and the other end is connected to a fixed base.

10. A vibrating screen for reducing powder content according to claim 9, characterized in that, The vibrating screen body is provided with a mounting base, which includes a supporting reinforcing rib and a supporting plate. A connecting shaft pin is provided on the side of the supporting plate near the supporting spring.

Images