Aggregate multi-stage particle size screening apparatus

Abstract

This utility model relates to the technical field of building material processing equipment, specifically to a multi-stage aggregate particle size screening device. The multi-stage aggregate particle size screening device includes a frame, screening components, a feeding conveyor belt, and a multi-stage discharge conveyor belt. The screening components are inclinedly arranged on the upper part of the frame. The feeding conveyor belt is parallel to the screen components above them for feeding aggregates to be screened. The multi-stage discharge conveyor belts are arranged sequentially from top to bottom below the screen components for receiving screened aggregates of different particle sizes. The screening components include a frame plate, screen bars, and hopper plates. The frame plates are symmetrically installed on the upper part of the frame. The screen bars are spaced apart along the length of the frame plates and divided into multiple rows along the height direction. The screening gap between each row of screen bars decreases progressively from top to bottom. Each row of screen bars has a hopper plate at its discharge end, with the hopper plate length decreasing progressively from top to bottom. A motor is installed on the outside of the frame plate.

Description

Technical Field

[0001] This utility model relates to the field of building material processing equipment technology, specifically to a multi-stage aggregate particle size screening device. Background Technology

[0002] In concrete production, mining, and construction waste recycling, it is often necessary to classify aggregates according to particle size to meet the gradation requirements of different applications. Existing aggregate screening equipment, especially multi-stage screening equipment, typically suffers from the following problems and drawbacks in practical applications: First, screening efficiency and effectiveness need to be improved; many traditional equipment use horizontally arranged vibrating screens, where aggregates mainly make throwing motions on the screen mesh, resulting in uneven distribution and easy accumulation. This makes it difficult for fine particles to contact the screen surface, leading to incomplete screening, screen blockage, and affecting screening efficiency and accuracy.

[0003] Secondly, the discharge flexibility is insufficient and it is difficult to adapt to diverse discharge conditions. The discharge conveyor belt of existing equipment is usually installed at a fixed angle or can only be adjusted in a simple angle. When it is necessary to change the discharge direction or height to adapt to different subsequent stacking or loading requirements, it is often necessary to move the entire equipment or use other auxiliary machinery, which is cumbersome and has poor adaptability.

[0004] Third, the collection and treatment of powdery materials are easily overlooked. Existing technologies focus on screening aggregates of different particle sizes, but for the powders (stone powder, soil powder, etc.) generated after screening, there is usually a lack of effective dedicated collection and conveying devices. They are often left to scatter or accumulate under the equipment, causing environmental pollution, material waste, and increasing the workload of subsequent cleaning. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this invention provides a multi-stage aggregate screening device with high screening efficiency, flexible discharge angle adjustment, and effective powder collection. This device combines multi-stage decreasing screening with vibration excitation and is equipped with a discharge conveyor belt with adjustable spatial angle, achieving efficient aggregate screening, flexible discharge, and comprehensive powder recovery.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a multi-stage aggregate particle size screening device, including a frame, a screening component, a feeding conveyor belt, and a multi-stage discharge conveyor belt. The screening component is inclinedly arranged on the upper part of the frame, and the feeding conveyor belt is arranged parallel above the screening component for conveying the aggregate to be screened to the screening component. The multi-stage discharge conveyor belt is arranged sequentially from top to bottom below the screening component for receiving the screened aggregates of different particle sizes. The screening component includes a frame plate, screen bars, and hopper plates, and the frame plate is symmetrically installed. At the top of the frame, the screen bars are arranged at intervals along the length of the frame plate and divided into multiple rows along the height direction. The screening gap between each row of screen bars decreases progressively from top to bottom. Each row of screen bars is provided with a hopper plate at its discharge end, and the length of the hopper plate decreases progressively from top to bottom. A motor is installed on the outside of the frame plate, and the motor output shaft passes through the frame plate and is connected by a shaft rod. The vibration of the motor is used to improve the screening efficiency of the screen bars. The multi-stage discharge conveyor belt includes a block material conveyor belt, a primary conveyor belt, a secondary conveyor belt, and a powder conveyor belt, which respectively receive aggregates of different particle size ranges.

[0007] In the above-mentioned multi-stage aggregate particle size screening equipment, the screen bars are divided into three rows, with the gap between the top row of screen bars being 50mm, the middle row being 20mm, and the bottom row being 5mm.

[0008] In the above-mentioned multi-stage aggregate particle size screening equipment, a frame rod is placed horizontally below the screen bar, and the two ends of the frame rod are welded to the frame plate to reinforce the screen bar.

[0009] In the above-mentioned multi-stage aggregate particle size screening equipment, the motor is a side plate vibration motor.

[0010] In the above-mentioned multi-stage aggregate particle size screening equipment, a base is provided below the block material conveyor belt, the base is rotatably connected to the frame, the block material conveyor belt is hinged to the base, and a first drive cylinder is provided between the base and the block material conveyor belt.

[0011] In the above-mentioned multi-stage aggregate particle size screening equipment, first support rods are symmetrically arranged on both sides of the first drive cylinder. The first support rods are composed of a first inner rod and a first outer rod that are slidably connected and are locked and limited by pins.

[0012] In the above-mentioned multi-stage aggregate particle size screening equipment, a second drive cylinder is horizontally arranged between the base and the frame for adjusting the circumferential angle of the block material conveyor belt.

[0013] In the above-mentioned multi-stage aggregate particle size screening equipment, one end of the primary conveyor belt is hinged to the frame, and a third drive cylinder and a second support rod are provided between the middle of the primary conveyor belt and the frame.

[0014] In the above-mentioned multi-stage aggregate particle size screening equipment, one end of the secondary conveyor belt is hinged to the frame, and a fourth drive cylinder and a third support rod are provided between the middle of the conveyor belt and the frame.

[0015] In the above-mentioned multi-stage aggregate particle size screening equipment, the powder conveyor belt is arranged flatly at the bottom of the frame plate to receive powdered aggregate.

[0016] The beneficial effects of this utility model are: 1. High screening efficiency and good anti-clogging effect: By adopting multiple rows of inclined screen bars with decreasing gaps and combined with vibration motor excitation, the aggregate is fully dispersed and jumps on the screen surface, accelerating the passage of small-diameter materials through the screen, effectively preventing material accumulation and screen hole clogging, and improving screening efficiency and accuracy.

[0017] 2. Flexible discharge and strong adaptability: By setting an adjustment mechanism consisting of a drive cylinder and a lockable support rod, the spatial position and inclination angle of the block material, primary and secondary conveyor belts can be adjusted independently and stably. It can flexibly adapt to different discharge directions and height requirements without moving the whole machine, which greatly improves the applicability of the equipment under different working conditions.

[0018] 3. Clear grading and complete powder recovery: By setting up multi-stage conveyor belts from top to bottom and precisely corresponding to the hopper plates of the screening components, the orderly separation and accurate discharge of aggregates at each level are ensured, avoiding mixing. A dedicated conveyor belt for powder is specially set up to achieve centralized collection and transportation of all screening products (including powder), reducing material waste and environmental pollution.

[0019] 4. Stable structure and reliable operation: The screening components are reinforced by frame rods, and the conveyor belt is supported and adjusted in coordination with the drive cylinder and the support rod, which enhances the overall structural rigidity and stability of key components under vibration and load conditions, and ensures the long-term reliability of the equipment. Attached Figure Description

[0020] The present invention will be further described below with reference to the embodiments and examples.

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment.

[0022] Figure 2 This is a front view structural diagram of an embodiment.

[0023] Figure 3 This is a schematic diagram of the overall structure of the screening component.

[0024] Figure 4 This is a schematic diagram of the motor and shaft structure of the screening assembly.

[0025] Figure 5 This is a schematic diagram of the rear view structure of an embodiment.

[0026] Figure 6 This is a structural diagram of the base, the first drive cylinder, the first support rod, the second drive cylinder, the fourth drive cylinder, and the third support rod.

[0027] Figure 7 This is a schematic diagram of the third drive cylinder and the second support rod.

[0028] In the diagram: 1. Frame; 2. Screening assembly; 21. Frame plate; 22. Screen bar; 23. Frame rod; 24. Bucket plate; 25. Motor; 26. Shaft; 3. Feeding conveyor belt; 4. Block material conveyor belt; 41. Base; 42. First drive cylinder; 43. First support rod; 44. Second drive cylinder; 5. Primary conveyor belt; 51. Third drive cylinder; 52. Second support rod; 6. Secondary conveyor belt; 61. Fourth drive cylinder; 62. Third support rod; 7. Powder conveyor belt. Detailed Implementation

[0029] This embodiment details a multi-stage aggregate particle size separation and screening device, such as... Figure 1-7 As shown, the multi-stage aggregate screening equipment mainly consists of a frame 1, screening components 2, a feeding conveyor belt 3, and a four-stage discharge conveyor belt. The frame 1 serves as the basic support structure, providing a stable installation platform for the entire equipment. The screening components 2 are arranged at an incline on the upper part of the frame 1. The feeding conveyor belt 3 is arranged parallel above the screening components 2 to convey the concrete aggregate to be screened to the screening components 2. The four-stage discharge conveyor belts, from top to bottom, are a block material conveyor belt 4, a primary conveyor belt 5, a secondary conveyor belt 6, and a powder conveyor belt 7, respectively arranged at corresponding positions below the screening components 2 to receive aggregates after screening of different particle sizes.

[0030] The screening assembly 2 includes frame plates 21, screen bars 22, support rods 23, bucket plates 24, a motor 25, and shafts 26. The frame plates 21 are symmetrically and spaced apart on the upper part of the frame 1 and are firmly connected to the frame 1 by bolts. Multiple screen bars 22 are evenly spaced along the length of the frame plates 21, and the screen bars 22 are divided into three rows along the height of the frame plates 21. The screening gap between each row of screen bars 22 decreases progressively from top to bottom; for example, the gap between the top row of screen bars 22 is 50mm, the middle row is 20mm, and the bottom row is 5mm, to meet the screening requirements of aggregates of different particle sizes. Support rods 23 are horizontally placed below the screen bars 22, and both ends of the support rods 23 are welded to the two frame plates 21 respectively, serving to reinforce the screen bars 22 and enhance the overall structural stability. A bucket plate 24 is provided at the discharge end of each row of screen bars 22. The two ends of the bucket plate 24 are connected to the frame plate 21 by bolts, and the length of each row of bucket plates 24 decreases from top to bottom to ensure that the aggregate after screening can fall accurately into the corresponding discharge conveyor belt and avoid mixing. In order to improve the screening effect of the screen bar 22, a motor 25 is installed on the outer side of the middle of each frame plate 21. The motor body is connected to the frame plate 21 by bolts. The output shaft of the motor 25 passes through the frame plate 21 and is connected to the output shaft of another motor 25 through the shaft 26. The shaft 26 and the output shaft of the motor 25 are connected by a coupling to ensure the stability of power transmission. In this embodiment, the motor 25 is a side plate vibration motor 25. The vibration of the motor 25 increases the vibration amplitude of the frame plate 21, causing the aggregate on the screen bar 22 to vibrate, thereby accelerating the material falling process and improving the screening efficiency.

[0031] A block material conveyor belt 4 is arranged on the upper part of the frame 1, below the uppermost bucket plate 24, to receive aggregates that are too large to pass through the uppermost screen bar 22. A base 41, rotatably connected to the frame 1, is located below the block material conveyor belt 4. The top of the base 41 is hinged to the block material conveyor belt 4. A first drive cylinder 42 is arranged between the upper part of the base 41 and the block material conveyor belt 4. The end of the cylinder body of the first drive cylinder 42 is hinged to the base 41, and the front end of the cylinder rod is hinged to the block material conveyor belt 4. To improve the support stability of the block material conveyor belt 4, first support rods 43 are symmetrically arranged on both sides of the first drive cylinder 42. Each first support rod 43 consists of a slidingly connected first inner rod and a first outer rod. The first outer rod is hinged to the bottom of the block material conveyor belt 4, and the first inner rod is hinged to the side of the base 41. The first inner rod is sleeved and connected to the first outer rod. The upper part of the first inner rod has through holes spaced apart along its length. The upper end of the first outer rod has a groove that matches the through holes. A pluggable pin is inserted into the through hole of the first inner rod to lock and limit the groove of the first outer rod. This improves the load-bearing strength of the block material conveyor belt 4 when it is suspended in space after adjusting the angle of the block material conveyor belt 4. A second drive cylinder 44 is horizontally arranged between the base 41 and the frame 1. The end of the cylinder body of the second drive cylinder 44 is hinged to the frame 1, and the front end of the cylinder rod is hinged to the block material conveyor belt 4. The extension and retraction of the second drive cylinder 44 can change the circumferential angle of the block material conveyor belt 4. The extension and retraction of the first drive cylinder 42 can change the longitudinal angle of the block material conveyor belt 4, so as to realize the flexible adjustment of the spatial position of the block material conveyor belt 4 to meet the discharge requirements under different working conditions.

[0032] The primary conveyor belt 5 is arranged on the upper part of the frame 1, below the middle bucket plate 24, and is used to receive the aggregate with larger particle size after the initial screening by the screen bar 22. One end of the primary conveyor belt 5 is hinged to the frame 1, and a third drive cylinder 51 and a second support rod 52 are arranged between the middle of the primary conveyor belt 5 and the frame 1. The end of the cylinder body of the third drive cylinder 51 is hinged to the frame 1, and the front end of the cylinder rod is hinged to the primary conveyor belt 5. The arrangement and structure of the second support rod 52 are the same as those of the first support rod 43, and are used to assist the third drive cylinder 51 in supporting the primary conveyor belt 5 in the longitudinal space to ensure the stability of the primary conveyor belt 5 during operation.

[0033] The secondary conveyor belt 6 is arranged on the upper part of the frame 1, below the lowest bucket plate 24, and is used to receive aggregates with smaller particle sizes after being screened again by the screen bars 22. One end of the secondary conveyor belt 6 is hinged to the frame 1, and a fourth drive cylinder 61 and a third support rod 62 are arranged between the secondary conveyor belt 6 and the frame 1 in the middle. The end of the cylinder body of the fourth drive cylinder 61 is hinged to the frame 1, and the front end of the cylinder rod is hinged to the secondary conveyor belt 6. The arrangement and structure of the third support rod 62 are the same as those of the second support rod 52, which assists the fourth drive cylinder 61 in supporting the secondary conveyor belt 6 in the longitudinal space, ensuring that the secondary conveyor belt 6 can operate stably and accurately transport the screened aggregates.

[0034] The powder conveyor belt 7 is arranged flush with the bottom of the frame plate 21 to receive the powdered aggregate that has been screened out by the three rows of screen bars 22, ensuring that the powdered aggregate can be transported to the designated position in a timely and accurate manner to complete the entire screening process.

[0035] Working process: After the equipment starts, the feeding conveyor belt 3 transports the concrete aggregate to be screened to the screening component 2. The motor 25 starts working, driving the frame plate 21 to vibrate, causing the aggregate on the screen bars 22 to vibrate. Aggregates with a particle size larger than the gap between the top row of screen bars 22 remain on the screen bars 22 and gradually move to the top bucket plate 24 under the action of vibration, and fall into the block conveyor belt 4. Aggregates with a particle size between the gap between the top row and the middle row of screen bars 22 pass through the top row of screen bars 22, are intercepted by the middle row of screen bars 22, move to the middle bucket plate 24 and fall into the primary conveyor belt 5. Aggregates with a particle size between the gap between the middle row and the bottom row of screen bars 22 pass through the gap between the middle row of screen bars 22. 2. The aggregates are intercepted by the bottom row of screen bars 22 and move to the bottom bucket plate 24 before falling into the secondary conveyor belt 6. Powdered aggregates with a particle size smaller than the gap between the bottom row of screen bars 22 pass directly through the screen bars 22 and fall into the powder conveyor belt 7. Each level of conveyor belt transports aggregates of different particle sizes to the corresponding positions according to the preset conveying direction, thus completing the multi-stage particle size screening of aggregates. In actual use, the vibration amplitude of the screening component 2 and the position angle of each level of discharge conveyor belt can be flexibly adjusted according to the characteristics of different aggregates and screening requirements by adjusting the vibration frequency of the motor 25, the extension and retraction of each drive cylinder, and the support position of the support rod, so as to achieve the best screening effect.

Claims

1. A multi-stage aggregate particle size screening device, characterized in that: Includes the frame, screening components, feeding conveyor belt, and multi-stage discharge conveyor belt. The screening assembly is inclinedly arranged on the upper part of the frame, the feeding conveyor belt is arranged parallel above the screening assembly for feeding the aggregate to be screened to the screening assembly, and the multi-stage discharge conveyor belt is arranged sequentially from top to bottom below the screening assembly for receiving the screened aggregate of different particle sizes. The screening assembly includes a frame plate, screen bars, and a hopper plate. The frame plate is symmetrically installed on the upper part of the frame. The screen bars are arranged at intervals along the length of the frame plate and divided into multiple rows along the height direction. The screening gap between each row of screen bars decreases progressively from top to bottom. The discharge end of each row of screen bars is provided with a hopper plate, and the length of the hopper plate decreases progressively from top to bottom. A motor is installed on the outside of the frame plate. The motor output shaft passes through the frame plate and is connected by a shaft rod. The vibration of the motor is used to improve the screening efficiency of the screen bars. The multi-stage discharge conveyor belt includes a block material conveyor belt, a primary conveyor belt, a secondary conveyor belt, and a powder material conveyor belt, which respectively receive aggregates of different particle size ranges.

2. The aggregate multi-stage particle size screening equipment according to claim 1, characterized in that: The screen bars are divided into three rows, with the gap between the top row of screen bars being 50mm, the middle row being 20mm, and the bottom row being 5mm.

3. The aggregate multi-stage particle size screening equipment according to claim 1, characterized in that: A support rod is placed horizontally below the screen bar, and the two ends of the support rod are welded to the frame plate to reinforce the screen bar.

4. The aggregate multi-stage particle size screening equipment according to claim 1, characterized in that: The motor is a side plate vibration motor.

5. The aggregate multi-stage particle size screening equipment according to claim 1, characterized in that: A base is provided below the block material conveyor belt, the base is rotatably connected to the frame, the block material conveyor belt is hinged to the base, and a first drive cylinder is provided between the base and the block material conveyor belt.

6. The aggregate multi-stage particle size screening equipment according to claim 5, characterized in that: The first drive cylinder has first support rods symmetrically arranged on both sides. The first support rod is composed of a first inner rod and a first outer rod that are slidably connected and are locked and limited by pins.

7. The aggregate multi-stage particle size screening equipment according to claim 5, characterized in that: A second drive cylinder is horizontally arranged between the base and the frame, used to adjust the circumferential angle of the block material conveyor belt.

8. The aggregate multi-stage particle size screening equipment according to claim 1, characterized in that: One end of the primary conveyor belt is hinged to the frame, and a third drive cylinder and a second support rod are provided between the middle of the belt and the frame.

9. The aggregate multi-stage particle size screening equipment according to claim 1, characterized in that: One end of the secondary conveyor belt is hinged to the frame, and a fourth drive cylinder and a third support rod are provided between the middle of the belt and the frame.

10. The aggregate multi-stage particle size screening equipment according to claim 1, characterized in that: The powder conveyor belt is arranged flush with the bottom of the frame plate to receive powdered aggregate.

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