Steel slag screening machine for asphalt pavement engineering

Abstract

The utility model belongs to the technical field of steel slag screening, and discloses a steel slag screening machine for asphalt pavement engineering, which comprises a rack and a screen drum rotationally arranged on the rack, and the screen drum is connected with a motor; the cam is fixedly connected with the screen drum, an output shaft of the motor penetrates through the cam to be connected with the screen drum, and the output shaft of the motor is fixedly connected with the cam; the vibrating roller is matched with the cam, the cam intermittently collides with the vibrating roller, the vibrating roller is movably arranged on the rack, a boss is arranged on the rack, the boss is rotationally connected with a supporting plate, a torsional spring used for resetting the supporting plate is arranged at the connecting point of the supporting plate and the boss, and the supporting plate is rotationally connected with the vibrating roller; a stirring assembly is arranged in the screen drum and comprises a main shaft and multiple groups of stirring rods, the main shaft is rotationally connected with the screen drum, and the multiple groups of stirring rods are circumferentially arranged along the axis of the main shaft; the steel slag screening barrel solves the problem that an existing screening barrel is poor in steel slag screening effect due to the centrifugal force effect.

Description

Technical Field

[0001] This solution belongs to the technical field of steel slag screening, and specifically relates to a steel slag screening machine for asphalt pavement engineering. Background Art

[0002] Steel slag is the waste residue generated during the steelmaking process. Steel slag mainly includes oxides generated from furnace charges and slag-making substances that change the properties of steel. The main chemical components of steel slag are CaO, FeO, Fe2O3, SiO2, MgO, Al2O3, and MnO, etc.; the mineral composition is dicalcium silicate (2CaO.SiO2), tricalcium silicate (3CaO.SiO2), dicalcium ferrite (2CaO.Fe2O3), and olivine (2FeO.SiO2), etc.

[0003] Developed countries started the research on using steel slag in asphalt concrete pavement very early. As early as 1969, in a bituminous concrete road built in the Mississauga-Toronto area of Canada, steel slag was used as part of the aggregate. Later test results showed that the quality of this road met the requirements. After that, the Ontario Ministry of Transportation in Canada also used steel slag in a bituminous concrete road north of Toronto. This road was used as an anti-skid test section. After use, the conclusion was drawn that in terms of anti-skid performance, steel slag is superior to natural aggregates. After a long time of research abroad, a large amount of practical experience has been accumulated, and steel slag is increasingly used as aggregate in asphalt pavements.

[0004] Referring to the literature with the existing publication (announcement) number CN116078656A, a multi-granularity steel slag aggregate screening device and method are disclosed. The device includes a main feeding mechanism, a screening material driving mechanism for driving the main feeding mechanism to rotate, and a discharging mechanism for controlling the discharging of the main feeding mechanism. The screening material driving mechanism is installed on the left side of the main feeding mechanism, and the discharging mechanism is installed on the right side of the main feeding mechanism; wherein, a steel slag collection assembly is placed at the discharging end of the main feeding mechanism; among them, the main feeding mechanism includes a feeding barrel, a first screening barrel, a second screening barrel, and a third screening barrel; the first screening barrel, the second screening barrel, and the third screening barrel are sequentially installed inside the feeding barrel from outside to inside, and the left ends of the first screening barrel, the second screening barrel, and the third screening barrel are all connected to the output end of the rotating screening material driving mechanism, and the right ends of the first screening barrel, the second screening barrel, and the third screening barrel are all rotatably connected to the inner wall of the feeding barrel.

[0005] The above-mentioned device screens the steel slag through the first screening barrel, the second screening barrel and the third screening barrel. However, when the steel slag is under the action of the centrifugal force generated by rotation in the screening barrel, the fine-grained steel slag will be pushed towards the periphery of the screening barrel by this force. This is because centrifugal force is essentially an inertial force, which causes the particles to be pushed outward along the radius of rotation. When the screening barrel rotates, the centrifugal force received by the steel slag particles is proportional to their mass, proportional to the radius of rotation, and proportional to the square of the rotation speed. Therefore, even for fine particles, when the rotation speed of the screening barrel is high, they will be subject to a significant centrifugal force. This force causes the small-particle steel slag to tend to be thrown away from the center of the screen and adhere to the side wall of the screening barrel, rather than passing through the screen holes and being discharged. As a result, these fine particles cannot be screened out in the expected manner, leading to a reduction in the screening effect. Moreover, if the rotation speed of the screening barrel is reduced, although the influence of the centrifugal force on the fine-grained steel slag can be reduced and they can be prevented from adhering to the wall of the screening barrel, too low a rotation speed will also result in a poor effect of driving the material to tumble and stratify, causing uneven distribution of the material in the screening barrel and affecting the screening efficiency. Secondly, a slow rotation speed will cause the fluidity of the material to become poor and prolong the time of the material in the screening barrel. Utility Model Content

[0006] The purpose of this solution is to provide a steel slag screening machine for asphalt pavement engineering to solve the problem that the existing screening barrel has a poor screening effect on steel slag due to the action of centrifugal force.

[0007] To achieve the above purpose, this solution provides a steel slag screening machine for asphalt pavement engineering, including a frame and a screening barrel rotatably arranged on the frame, and the screening barrel is connected with a motor; it also includes:

[0008] A cam, the cam is fixedly connected with the screening barrel, the output shaft of the motor passes through the cam and is connected with the screening barrel, and the output shaft of the motor is fixedly connected with the cam;

[0009] A vibrating roller, the vibrating roller is arranged in cooperation with the cam, the cam intermittently collides with the vibrating roller, and the vibrating roller is movably arranged on the frame.

[0010] The principle of this solution is as follows: The steel slag is fed into the screening barrel, the motor drives the screening barrel to rotate circumferentially, driving the steel slag inside the screening barrel to tumble. The rotation of the screening barrel drives the cam to rotate synchronously. The rotation of the cam will periodically collide with the vibrating roller, thereby causing the screening barrel to vibrate periodically, so that the steel slag adhering to the inner wall of the screening barrel will fall off, and then the steel slag is screened.

[0011] The effects of this solution are as follows: (1) By combining the circumferential rotation of the screening cylinder with the periodic vibration generated by the cam and the vibrating roller, the steel slag can be turned over and dispersed more effectively, reducing material blockage and screen mesh blockage, thereby improving the overall screening efficiency. (2) The vibration generated by the intermittent collision between the vibrating roller and the cam can cause the steel slag attached to the inner wall of the screening cylinder to fall off, avoiding the problem of fine particle steel slag attachment caused by centrifugal force and ensuring that the steel slag is fully screened. (3) The structure of the screening machine is simply designed, facilitating regular inspection and maintenance, and reducing the maintenance difficulty and cost. (4) It avoids the problem of the extended screening time caused by reducing the motor speed.

[0012] Furthermore, a boss is provided on the frame. The boss is rotatably connected to a support plate. A torsion spring for resetting the support plate is provided at the connection point between the support plate and the boss. The support plate is rotatably connected to the vibrating roller.

[0013] The principle and effects of this solution are as follows: When the cam collides with the vibrating roller, the support plate is stressed and drives the vibrating roller to rotate. After the cam moves away from the vibrating roller, the torsion spring drives the support plate and the vibrating roller to reset. Through the above settings, direct hard contact between the cam and the vibrating roller is avoided, reducing mechanical wear and damage and extending the service life of the equipment.

[0014] Furthermore, a through groove is provided on the support plate, and a shock absorber is provided in the through groove.

[0015] The principle and effects of this solution are as follows: The shock absorber can adjust the vibration amplitude of the vibrating roller to ensure that the vibration is within a certain range, which can not only achieve the screening effect but also will not cause excessive impact on the equipment, reducing the stress and vibration on the structure of the screening machine.

[0016] Furthermore, a limiting groove is provided on the boss, and the support plate is arranged in the limiting groove.

[0017] The principle and effects of this solution are as follows: The limiting groove provides positioning and guiding functions for the movement of the support plate.

[0018] Furthermore, the motor is a servo motor, and the motor is connected to a PID controller.

[0019] The principle and effects of this solution are as follows: In this solution, the user controls the speed of the motor through the PID controller, making the motor speed sometimes fast and sometimes slow, and the speed of the motor changes periodically. The advantages of such a setting are as follows: (1) This speed change can control the movement state of the steel slag in the screening cylinder. A fast speed helps to quickly turn over and disperse the material, while a slow speed helps to achieve fine separation and reduce screen mesh blockage. (2) The periodically changing speed can optimize the stratification of the material in the screening cylinder, enabling effective screening of fine particles and avoiding the mixing of oversized particles, thereby improving the screening accuracy.

[0020] Further, a stirring assembly is provided inside the sieve cylinder. The stirring assembly includes a main shaft and stirring rods. The main shaft is rotatably connected to the sieve cylinder. The number of the stirring rods is multiple groups, and the multiple groups of stirring rods are circumferentially arranged along the axis of the main shaft.

[0021] The principle and effect of this solution are as follows: First, the stirring assembly can effectively turn over and mix the steel slag in the sieve cylinder, enhance the fluidity of the material, and avoid the fine particles adhering to the inner wall of the sieve cylinder due to the centrifugal force, thereby improving the screening efficiency; Second, this structure helps to break up the possible material agglomeration, ensure the uniform distribution of the material in the sieve cylinder, and reduce the risk of screen clogging.

[0022] Further, the sieve cylinder is inclined.

[0023] The principle and effect of this solution are as follows: The inclined sieve cylinder can utilize gravity to assist the material flow, thereby improving the screening efficiency, making the material easier to slide down along the inclined surface in the sieve cylinder, accelerating the forward speed of the material, and reducing the residence time in the sieve cylinder.

[0024] Further, a belt conveyor is provided at the bottom of the sieve cylinder.

[0025] The principle and effect of this solution are as follows: The belt conveyor is used to convey the screened fine steel slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural view of a steel slag screening machine for an asphalt pavement project of the present utility model Figure 1 ;

[0027] Figure 2 is a schematic structural view of a steel slag screening machine for an asphalt pavement project of the present utility model Figure 2 ;

[0028] Figure 3 is a schematic structural view of the stirring assembly of the present utility model;

[0029] Figure 4 is Figure 2 an enlarged view of part A in

[0030] Figure 5 is a schematic structural view of the belt conveyor of the present utility model.

[0031] The names of the corresponding marks in the drawings are: frame 1, sieve cylinder 2, motor 3, cam 4, vibrating roller 5, convex platform 6, limiting groove 61, support plate 7, through groove 71, stirring assembly 8, main shaft 81, stirring rod 82, shock absorber 9, belt conveyor 10. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The concept and technical effects of the present utility model will be clearly and completely described below in conjunction with embodiments to fully understand the purpose, features, and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present utility model:

[0033] Embodiment:

[0034] Please refer to Figure 1 , a steel slag screening machine for asphalt pavement engineering, including a frame 1 assembled by combining several profiles. A screening cylinder 2 is inclinedly arranged on the frame 1. The aperture of the screening holes on the screening cylinder 2 can be adjusted according to production needs to screen steel slag of suitable size. The inclination angle of the screening cylinder 2 is 120 degrees. Inclining the screening cylinder 2 can utilize gravity to assist the flow of materials, thereby improving the screening efficiency, making it easier for the materials to slide down along the inclined surface in the screening cylinder 2, accelerating the forward speed of the materials, and reducing the residence time in the screening cylinder 2. A belt conveyor 10 is arranged below the screening cylinder 2 for conveying the fine steel slag screened out by the screening cylinder 2. A support seat for supporting the screening cylinder 2 is arranged on the frame 1, and the screening cylinder 2 is rotatably connected to the support seat. A motor 3 is also arranged on the frame 1. The motor 3 is a servo motor and is electrically connected to a PID controller. The screening cylinder 2 is fixedly connected to the output end of the motor 3. Users can control the rotation speed of the motor 3 through the PID controller, making the rotation speed of the motor 3 sometimes fast and sometimes slow, and making the rotation speed of the motor 3 change periodically. This change in rotation speed can control the movement state of the steel slag in the screening cylinder 2. A fast rotation speed helps to quickly turn over and disperse the materials, while a slow rotation speed helps to achieve fine separation and reduce screen clogging.

[0035] Please refer to Figure 2 and Figure 4, a cam 4 is also fixedly connected to the connection end of the sieve cylinder 2 and the motor 3. The output shaft of the motor 3 passes through the cam 4 and is connected to the sieve cylinder 2, and the output shaft of the motor 3 is fixedly connected to the cam 4; there is a boss 6 on the frame 1, and a set of symmetrically arranged support plates 7 are rotatably connected inside the boss 6. A torsion spring for resetting the support plate 7 is provided at the connection point (rotating shaft) of the support plate 7 and the boss 6. One end of the support plate 7 is rotatably connected to a vibration roller 5 that cooperates with the cam 4. The steel slag is fed into the sieve cylinder 2, and the motor 3 drives the sieve cylinder 2 to rotate circumferentially, driving the steel slag inside the sieve cylinder 2 to turn over. The rotation of the sieve cylinder 2 drives the cam 4 to rotate synchronously. The rotation of the cam 4 will periodically collide with the vibration roller 5. When the cam 4 collides with the vibration roller 5, the support plate 7 is stressed and drives the vibration roller 5 to rotate. After the cam 4 moves away from the vibration roller, the torsion spring drives the support plate 7 and the vibration roller 5 to reset. Through the above settings, direct hard contact between the cam and the vibration roller is avoided, mechanical wear and damage are reduced, and the service life of the equipment is extended. At the same time, through the circumferential rotation of the sieve cylinder 2 combined with the periodic vibration generated by the cam 4 and the vibration roller 5, the steel slag can be turned over and dispersed more effectively, reducing material blockage and screen blockage phenomena, thereby improving the overall screening efficiency. The vibration generated by the intermittent collision between the vibration roller 5 and the cam 4 can cause the steel slag attached to the inner wall of the sieve cylinder 2 to fall off, avoiding the problem of fine particle steel slag attachment caused by centrifugal force and ensuring that the steel slag is fully screened.

[0036] Please refer to Figure 4 , a through groove 71 is provided on the support plate 7, and a shock absorber 9 is provided inside the through groove 71. The shock absorber 9 is rotatably connected to the vibration roller 5. The shock absorber 9 can adjust the vibration amplitude of the vibration roller 5 to ensure that the vibration is within a certain range, which can not only achieve the screening effect but also will not cause too much impact on the equipment, reducing the stress and vibration on the structure of the screening machine. A limiting groove 61 is provided on the boss 6, and the support plate 7 is arranged inside the limiting groove 61. The limiting groove 61 provides positioning and guiding functions for the movement of the support plate 7.

[0037] Please refer to Figure 3 , a stirring assembly 8 is provided inside the sieve cylinder 2. The stirring assembly 8 includes a main shaft 81 and stirring rods 82. The main shaft 81 is rotatably connected to the sieve cylinder 2. The number of stirring rods 82 is 6, and the 6 stirring rods 82 are arranged circumferentially along the axis of the main shaft 81. The stirring assembly 8 can effectively turn over and mix the steel slag inside the sieve cylinder 2, enhance the fluidity of the material, avoid the adhesion of fine particles to the wall of the sieve cylinder 2 caused by centrifugal force, thereby improving the screening efficiency; secondly, this structure helps to break up the material agglomerates that may form, ensure the uniform distribution of the material inside the sieve cylinder 2, and reduce the risk of screen blockage.

[0038] The above are only embodiments of the present utility model, and common general knowledge such as specific structures and characteristics known in the solutions is not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A steel slag screening machine for asphalt pavement engineering, comprising a frame (1) and a screen drum (2) rotatably arranged on the frame (1), wherein the screen drum (2) is connected to a motor (3); characterized in that: Also includes: A cam (4), the cam (4) being fixedly connected to the screen drum (2), the output shaft of the motor (3) passing through the cam (4) and connected to the screen drum (2), and the output shaft of the motor (3) being fixedly connected to the cam (4); A vibration roller (5), wherein the vibration roller (5) is arranged in cooperation with the cam (4), the cam (4) intermittently collides with the vibration roller (5), and the vibration roller (5) is movably arranged on the frame (1).

2. The steel slag screening machine for asphalt pavement engineering according to claim 1, characterized in that: The frame (1) is provided with a boss (6), the boss (6) is rotatably connected to a support plate (7), a torsion spring for resetting the support plate (7) is provided at a connection point between the support plate (7) and the boss (6), and the support plate (7) is rotatably connected to the vibration roller (5).

3. The steel slag screening machine for asphalt pavement engineering according to claim 2, characterized in that: The support plate (7) is provided with a through slot (71), and a shock absorber (9) is provided in the through slot (71).

4. The steel slag screening machine for asphalt pavement engineering according to claim 2, characterized in that: The boss (6) is provided with a limiting groove (61), and the support plate (7) is arranged in the limiting groove (61).

5. The steel slag screening machine for asphalt pavement engineering according to claim 1, characterized in that: The motor (3) is a servo motor, and the motor (3) is connected to a PID controller.

6. The steel slag screening machine for asphalt pavement engineering according to claim 1, characterized in that: A stirring assembly (8) is provided in the sieve drum (2), the stirring assembly (8) comprising a main shaft (81) and stirring rods (82), the main shaft (81) being rotatably connected to the sieve drum (2), the stirring rods (82) being provided in a plurality of groups, and the plurality of groups of stirring rods (82) being arranged along the circumference of the axis of the main shaft (81).

7. The steel slag screening machine for asphalt pavement engineering according to claim 1, characterized in that: The screen drum (2) is arranged inclined.

8. The steel slag screening machine for asphalt pavement engineering according to claim 1, characterized in that: A belt conveyor (10) is provided at the bottom of the screen drum (2).

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