A steel fiber screening apparatus

Abstract

The utility model relates to screening equipment technical field especially relates to a kind of steel fiber screening equipment, comprising: conveying mechanism, including support frame and the conveying belt rotationally connected on support frame;Main truss, main truss straddles the initial end of conveying mechanism and is set;Screening mechanism, fixed on main truss, screening mechanism includes screening subassembly, for material is sent into the feeding platform in screening subassembly, and the discharge outlet of screening subassembly is correspondingly set with the discharge hopper;Wherein, screening subassembly at least includes coaxial setting inner layer screening drum and outer layer screening drum, inner layer screening drum and outer layer screening drum relatively rotate, discharge hopper is set towards conveying belt.The utility model is set by the rotation of inner layer screening drum and outer layer screening drum, by the centrifugal force generated by rotation and the impact force generated by steel fiber following rotation and falling, and by the combination of vibration and rotation, so that the effect of screening is further improved.

Description

Technical Field

[0001] This utility model relates to the field of screening equipment technology, and in particular to a steel fiber screening device. Background Technology

[0002] Ultra-high performance concrete (UHPC) materials can increase the stiffness of bridges and reduce the probability of pavement defects, and are widely used in bridge and road engineering. During the preparation of UHPC, steel fibers are usually added. The addition of steel fibers can, on the one hand, transfer stress through interfacial adhesion with the matrix, delaying crack propagation and penetration; on the other hand, steel fibers can effectively disperse local stress concentration, reduce the stress intensity factor at crack tips, and inhibit crack initiation and propagation, thereby improving the overall performance of the composite material. However, clumping is prone to occur during steel fiber cutting, which reduces the road performance of UHPC and also reduces construction efficiency.

[0003] In the prior art, such as Chinese utility model patent with publication number CN2051530U, a metal fiber dispersing screen is disclosed. The dispersing screen is vibrated by a vibrating table, so that the agglomerated steel fibers automatically slide into the collection hopper under the vibration of the dispersing screen, thereby realizing the dispersing operation of the agglomerated steel fibers.

[0004] However, the dispersion effect of the above-mentioned vibrating screening method is limited. For some tightly clustered steel fiber clumps, vibration alone cannot achieve effective dispersion. Utility Model Content

[0005] In view of at least one of the above technical problems, the present invention provides a steel fiber screening device, which adopts structural improvements to enhance the effectiveness of steel fiber screening.

[0006] According to a first aspect of the present invention, a steel fiber screening device is provided, comprising: A conveying mechanism, including a support frame and a conveyor belt rotatably connected to the support frame; A main truss, which is arranged across the initial end of the conveying mechanism; A screening mechanism is fixed on the main truss. The screening mechanism includes a screening component, a feeding platform for feeding materials into the screening component, and a discharge hopper corresponding to the discharge port of the screening component. The screening assembly includes at least an inner screening drum and an outer screening drum arranged coaxially, the inner screening drum and the outer screening drum rotating relative to each other, and the discharge hopper being positioned toward the conveyor belt.

[0007] Furthermore, the support frame includes a horizontal section and an inclined section connected to the horizontal section. The highest point of the inclined section is adapted to the height of the mixing plant. The main truss is arranged across the horizontal section, and the discharge port faces the horizontal section.

[0008] Furthermore, both the inner and outer screening rollers are arranged radially and vertically, and screens are provided on the radial surfaces of both the inner and outer screening rollers. The aperture of the screen of the inner screening roller is larger than that of the outer screening roller.

[0009] Furthermore, the screening assembly also includes a rolling drive assembly for driving the outer screening drum to rotate.

[0010] Furthermore, the rolling drive assembly is connected to the outer screening roller, and the inner wall of the outer screening roller is also provided with a toothed ring. A gear is also rotatably connected between the outer screening roller and the inner screening roller, so that the outer screening roller and the inner screening roller rotate in opposite directions.

[0011] Furthermore, the rolling drive assembly includes a motor, a belt connected to the output end of the motor, and a rotating shaft connected to the other end of the belt. The rotating shaft is connected to the outer screening drum to drive the rotation of the outer screening drum.

[0012] Furthermore, electromagnetic exciters are fixed at the vertical edges of both the outer and inner screening rollers to drive the vibration of the inner and outer screening rollers.

[0013] Furthermore, the electromagnetic exciter includes an iron core, a coil wrapped around the iron core, and an armature disposed opposite to the iron core, wherein the armature reciprocates in the alternating magnetic field formed by the coil.

[0014] Furthermore, the screening assembly also includes a middle screening roller coaxially disposed between the inner screening roller and the outer screening roller, wherein the aperture of the screen on the middle screening roller is between the apertures of the screens on the inner screening roller and the outer screening roller.

[0015] Furthermore, the inner screening drum, the middle screening drum, and the outer screening drum are all equipped with vibration sensors, which are used to detect the frequency and amplitude of vibration.

[0016] The beneficial effects of this utility model are as follows: By setting an inner screening drum and an outer screening drum in the screening assembly, the steel fibers fed into the inner screening drum by the feeding platform are screened by the inner screening drum and fall to the outer screening drum, which improves the reliability of steel fiber agglomeration screening. Furthermore, by rotating the inner and outer screening drums, the centrifugal force generated by the rotation and the impact force generated by the steel fibers falling with the rotation further improve the screening effect. Attached Figure Description

[0017] 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 recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the steel fiber screening equipment in an embodiment of the present invention; Figure 2 This is a schematic diagram of the screening mechanism in an embodiment of the present invention; Figure 3 This is an exploded structural diagram of the inner and outer screening rollers in an embodiment of the present invention; Figure 4 This is a schematic diagram of the rotating connection structure between the inner screening drum and the outer screening drum in an embodiment of this utility model; Figure 5 This is a schematic diagram of the electromagnetic exciter in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1. Conveying mechanism; 2. Main truss; 3. Screening mechanism; 31. Screening assembly; 311. Inner screening drum; 3111. Screen; 312. Outer screening drum; 313. Gear; 314. Middle screening drum; 32. Feeding platform; 33. Discharge hopper; 34. Rolling drive assembly; 35. Electromagnetic exciter; 351. Iron core; 352. Coil; 353. Armature; 36. Vibration sensor. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] like Figures 1 to 5 The steel fiber screening equipment shown includes a conveying mechanism, a main truss 2, and a screening mechanism 3. Please refer to the details. Figure 1 and Figure 2 In an embodiment of this utility model, the conveying mechanism includes a support frame and a conveyor belt rotatably connected to the support frame. It should be noted that the rotation of the conveyor belt is achieved through a drive mechanism. This rotation allows the dispersed steel fibers, screened by the screening mechanism 3, to be transported to, for example, a mixing plant for mixing with concrete. Please continue to refer to... Figure 1 and Figure 2 In some embodiments of this utility model, the main truss 2 spans the initial end of the conveying mechanism; in some embodiments of this utility model, the main truss 2 is hollowed out in the middle for mounting the screening mechanism 3. The main truss 2 can be welded from steel profiles, or, as needed, can be implemented using screws or other materials. The screening mechanism 3 is fixed to the main truss 2 and includes a screening component 31, a feeding platform 32 for feeding materials into the screening component 31, and a discharge hopper 33 corresponding to the discharge port of the screening component 31; in some embodiments of this utility model, such as Figure 2 As shown, the feeding platform 32 has a discharge port, which is connected to the screening component 31, allowing the steel fibers to enter the screening component 31 for screening; please continue to refer to Figure 2In this embodiment of the invention, the screening assembly 31 includes at least an inner screening roller 311 and an outer screening roller 312 arranged coaxially. The inner screening roller 311 and the outer screening roller 312 rotate relative to each other, and the discharge hopper 33 is positioned towards the conveyor belt. It should be noted that during the screening process, the steel fibers flow through the inner screening roller 311 first, then the rotation of the inner screening roller 311 causes the steel fibers to enter the outer screening roller 312, and finally fall onto the conveyor belt through the discharge hopper 33. Of course, it should also be noted that there are various ways to rotate the inner screening roller 311 and the outer screening roller 312. For example, the outer screening roller 312 can be rotated between at least two rotating rollers, and the ends of the inner screening roller 311 and the outer screening roller 312 can be rotated through bearings. The rotation of the inner screening roller 311 and the outer screening roller 312 can be driven by setting bevel teeth on the outer side of the inner screening roller 311 and the outer screening roller 312. It should be noted that coaxial connection and rotation are conventional technical means in this field and will not be elaborated here.

[0024] In the above embodiment, the inner screening drum 311 and the outer screening drum 312 in the screening assembly 31 ensure that the steel fibers fed into the inner screening drum 311 by the feeding platform 32 are screened and fall onto the outer screening drum 312, improving the reliability of steel fiber agglomeration screening. Furthermore, the rotation of the inner and outer screening drums 311 and 312, combined with the centrifugal force generated by rotation and the impact force generated by the steel fibers falling with the rotation, further enhances the screening effect. Various specific feeding methods are possible, such as feeding through an opening in the axial side wall.

[0025] Based on the above embodiments, such as Figure 1As shown, in some embodiments of this utility model, the support frame includes a horizontal section and an inclined section connected to the horizontal section. The highest point of the inclined section is adapted to the height of the mixing tower. The main truss 2 is arranged across the horizontal section, and the discharge port faces the horizontal section. Here, the discharge port refers to the outlet of the hopper 33. In embodiments of this utility model, by setting the horizontal section below the main truss 2, the steel fibers after screening can fall onto the horizontal section without falling outside the conveying mechanism 1 due to their own weight. In addition, in embodiments of this utility model, a negative pressure mechanism can be set at the discharge port to achieve negative pressure unloading. Furthermore, in embodiments of this utility model, the discharge port on the loading platform 32 can also be set as an adjustable structure. Specifically, the discharge port can be set as a "basket" type, and the opening size of the discharge port can be adjusted. The specific adjustment method can be achieved by driving the side walls on both sides of the discharge port to move closer or further apart through a linear drive component. In addition, to ensure the reliability of the adjustment, a fiber sensor, such as a limit switch, can be installed at the discharge port to avoid excessive reduction or increase of the opening. Of course, to ensure the safety of feeding, guardrails can also be installed on both sides of the feeding platform 32.

[0026] In some embodiments of this utility model, such as Figure 3 As shown in the schematic diagram, both the inner screening drum 311 and the outer screening drum 312 are arranged vertically in the radial direction, and both the inner screening drum 3111 and the outer screening drum 312 are provided with screens 3111 on their radial surfaces. The aperture of the screen 3111 of the inner screening drum 311 is larger than that of the outer screening drum 312. It should be noted that the specific rotational connection method and driving form of the inner screening roller 311 and the outer screening roller 312 have been described in detail above and will not be repeated here. Regarding the specific dimensions of the screening rollers, in some embodiments of this utility model, the diameter of the inner screening roller 311 can be set to 0.2m, and the diameter of the outer screening roller 312 can be set to 0.6m. Regarding the specific material of the screen 3111, in some embodiments of this utility model, a manganese steel perforated plate can be used, and the specific perforation size can be between 1mm and 1cm. For example, a 1cm perforation can be set on the inner screening roller 311, and a 1mm perforation can be set on the outer screening roller 312. In order to reduce the jamming of steel fibers, in the embodiments of this utility model, the screen holes are set as conical holes, that is, a structure with a large inner hole diameter and a small outer hole diameter.

[0027] In some embodiments of this utility model, the screening assembly 31 further includes a rolling drive assembly 34 for driving the outer screening roller 312 to rotate. Please refer to [the relevant documentation] for details. Figure 4In some embodiments of this utility model, the rolling drive assembly 34 is connected to the outer screening roller 312, and the inner wall of the outer screening roller 312 also has a gear ring. A gear 313 is rotatably connected between the outer screening roller 312 and the inner screening roller 311, causing the outer screening roller 312 and the inner screening roller 311 to rotate in opposite directions. It should be noted that in some embodiments of this utility model, some specific structures of the rolling drive assembly 34 are as follows: Figure 2 As shown, the rolling drive assembly 34 includes a motor, a belt connected to the output end of the motor, and a rotating shaft connected to the other end of the belt. The rotating shaft is connected to the outer screening drum 312 to drive the rotation of the outer screening drum 312. With this configuration, the rotation of the motor drives the rotation of the belt, which in turn drives the rotation of the shaft. The shaft then drives the rotation of the outer screening drum 312. Simultaneously, due to the meshing of the gear ring and gear 313 inside the outer screening drum 312, and the meshing of the gear 313 with the inner screening drum 311, the rotation of the outer screening drum 312 drives the rotation of the gear 313, which in turn drives the rotation of the inner screening drum 311. This achieves the opposite rotation of the outer and inner screening drums 312 and 311. As a result, the clumps of steel fibers are carried to a high position by the screen 3111 under the action of rotation, and then fall down, causing the clumps of steel fibers to scatter until they fall from the screen 3111 of the inner screening drum 311 into the outer screening drum 312. The process continues in the outer screening drum 312, effectively breaking up the clumps of steel fibers.

[0028] Furthermore, in some embodiments of this utility model, in order to further improve the screening effect, such as... Figure 2 As shown, electromagnetic actuators 35 are fixed at the vertical edges of both the outer screening drum 312 and the inner screening drum 311 to drive the vibration of the inner screening drum 311 and the outer screening drum 312. The specific installation positions are as follows... Figure 2 As shown, the connection can be achieved by using a dovetail groove structure fixed on the frame of the screen 311, specifically inside the vertical upper and lower edges of the inner screening roller 311 and the outer screening roller 312. In addition, in this embodiment of the invention, in order to improve the service life of the exciter, oil-resistant silicone is also embedded in the contact surface between the electromagnetic exciter 35 and the screen 3111.

[0029] Regarding the specific structure and working principle of the electromagnetic actuator 35, as follows: Figure 5As shown, the electromagnetic exciter 35 includes an iron core 351, a coil 352 wrapped around the iron core 351, and an armature 353 disposed opposite to the iron core 351. The armature 353 reciprocates in the alternating magnetic field formed by the coil 352. It should be noted that in the embodiments of this utility model, the armature 353 achieves reciprocating motion in at least one direction through a device such as a spring arm. An alternating magnetic field is formed by passing an alternating current through the coil 352, which can interact with the armature 353 in the magnetic field, so that the armature 353 can reciprocate, thereby driving the vibration of the inner screening roller 311 and the outer screening roller 312. The vibration is designed to facilitate the falling of steel fibers from the screen 3111. In addition, in the embodiments of this utility model, multiple electromagnetic exciters 35 vibrate synchronously. In addition to the aforementioned oil-resistant silicone, rubber or other materials can be used as a buffer device to avoid damage to the screen 3111.

[0030] In some other embodiments of this utility model, the screening assembly 31 further includes a middle screening roller 314 coaxially disposed between the inner screening roller 311 and the outer screening roller 312, wherein the aperture of the screen 3111 on the middle screening roller 314 is between the apertures of the screen 3111 on the inner screening roller 311 and the outer screening roller 312. That is, by adding an intermediate screening roller, the vibratory screening is more thorough, further increasing the particle size and improving the screening effect.

[0031] Furthermore, in this embodiment of the invention, vibration sensors 36 are provided on the inner screening drum 311, the middle screening drum 314, and the outer screening drum 312. The vibration sensors 36 are used to detect the frequency and amplitude of vibration. In this embodiment of the invention, for example, the vibration sensors 36 can be monitored by a PLC. The system can provide real-time feedback on the screening status based on the frequency and amplitude of vibration, and can also adjust the rotation speed and vibration frequency to achieve intelligent adjustment. In this embodiment of the invention, the motor voltage is 380V, and the speed range is 800~3000rpm; the vibration frequency of the electromagnetic exciter 35 is 800-3000RPM, and the amplitude is 1-8mm.

[0032] In actual use, first confirm that the power supply is properly grounded and all fasteners are secure. Check the integrity of the screen 3111. Taking a three-layer screen 3111 as an example, check whether the aperture of the three-layer screen 3111 is assembled according to the process requirements. Add grease to the shaft and motor lubrication points. Start the equipment under no-load and run it for 3 minutes. Observe whether the motor current is stable and whether there is any abnormal noise from each layer of the vibration mechanism. Next, set the parameters. Set the shaft speed, the vibration frequency and amplitude of the electromagnetic exciter 35 on each layer of screen 3111, and the conveyor belt speed on the control panel. Next, start the equipment by pressing the main power switch to start the conveyor belt drive, activating the electromagnetic exciter 35 and calibrating the synchronization. Then, feed the material evenly through the feeding platform 32, with a recommended feeding speed not exceeding 50 kg / min. After the material passes through the vibrating screen of the inner screening drum 311, large clumps are separated. It then enters the middle screening drum 314, where small steel fiber clumps are separated. Finally, it enters the outer screening drum 312, where fine particles are separated. Finally, it enters the conveyor belt through the discharge hopper 33. During the vibration process, the monitoring system monitors the process in real time. Finally, when shutting down, turn off the feed and wait 1 to 2 minutes for the screen 3111 to empty. Then, stop each electromagnetic exciter 35 in sequence, cut off the motor power, and finally clean the screen 3111 residue with an air gun.

[0033] Those skilled in the art should understand that this utility model is not limited to the above 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 steel fiber screening device, characterized in that, include: A conveying mechanism, including a support frame and a conveyor belt rotatably connected to the support frame; A main truss, which is arranged across the initial end of the conveying mechanism; A screening mechanism is fixed on the main truss. The screening mechanism includes a screening component, a feeding platform for feeding materials into the screening component, and a discharge hopper corresponding to the discharge port of the screening component. The screening assembly includes at least an inner screening drum and an outer screening drum arranged coaxially, the inner screening drum and the outer screening drum rotating relative to each other, and the discharge hopper being positioned toward the conveyor belt.

2. The steel fiber screening equipment according to claim 1, characterized in that, The support frame includes a horizontal section and an inclined section connected to the horizontal section. The highest point of the inclined section is adapted to the height of the mixing plant. The main truss is arranged across the horizontal section, and the discharge port faces the horizontal section.

3. The steel fiber screening equipment according to claim 2, characterized in that, Both the inner and outer screening rollers are arranged vertically in the radial direction, and screens are provided on the radial surfaces of both the inner and outer screening rollers. The aperture of the screen in the inner screening roller is larger than that in the outer screening roller.

4. The steel fiber screening equipment according to claim 2, characterized in that, The screening assembly also includes a rolling drive assembly for driving the outer screening drum to rotate.

5. The steel fiber screening equipment according to claim 4, characterized in that, The rolling drive assembly is connected to the outer screening roller. The inner wall of the outer screening roller also has a toothed ring. A gear is rotatably connected between the outer screening roller and the inner screening roller, so that the outer screening roller and the inner screening roller rotate in opposite directions.

6. The steel fiber screening equipment according to claim 4, characterized in that, The rolling drive assembly includes a motor, a belt connected to the output end of the motor, and a rotating shaft connected to the other end of the belt. The rotating shaft is connected to the outer screening drum to drive the rotation of the outer screening drum.

7. The steel fiber screening equipment according to claim 1, characterized in that, Electromagnetic exciters are fixed at the vertical edges of both the outer and inner screening rollers to drive their vibration.

8. The steel fiber screening equipment according to claim 7, characterized in that, The electromagnetic exciter includes an iron core, a coil wrapped around the iron core, and an armature disposed opposite to the iron core. The armature reciprocates in the alternating magnetic field formed by the coil.

9. The steel fiber screening equipment according to claim 3, characterized in that, The screening assembly also includes a middle screening drum coaxially disposed between the inner screening drum and the outer screening drum, wherein the aperture of the screen on the middle screening drum is between the apertures of the screens on the inner screening drum and the outer screening drum.

10. The steel fiber screening equipment according to claim 9, characterized in that, The inner, middle, and outer screening drums are all equipped with vibration sensors, which are used to detect the frequency and amplitude of vibration.

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