Two-stage metering high-precision fiber batching device and method

Abstract

The invention discloses a two-stage metering high-precision fiber batching device and method.The two-stage metering high-precision fiber batching device comprises a buffering feeding belt conveyor, a fiber feeder and a precise weighing belt conveyor, a discharge port of the buffering feeding belt conveyor is provided with an arc door discharge mechanism, the arc door discharge mechanism corresponds to a stock bin of the fiber feeder, and the precise weighing belt conveyor is arranged on the arc door discharge mechanism; a coarse weighing device is arranged at the lower end of the fiber feeder, a discharge port of the fiber feeder corresponds to a guide hopper of the fine weighing belt conveyor, an electric disperser is arranged on the fine weighing belt conveyor, a discharge port of the fine weighing belt conveyor corresponds to a discharge port vibrating screen, and a fine weighing device is arranged at the lower end of the fine weighing belt conveyor. By adopting a mode of combining rough weighing of the fiber feeder with fine weighing of the fine weighing belt conveyor, the influence of vibration and start-stop buffer of the fiber feeder on weighing is eliminated, so that the batching precision is greatly improved, automatic operation of the whole batching process is realized, the labor cost is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This invention relates to a steel fiber batching technology, and more particularly to a high-precision fiber batching device and method with dual-stage metering. Background Technology

[0002] In the concrete industry, adding steel fibers to the mixer can effectively improve various performance indicators of concrete. Traditionally, this is done manually, which is inefficient, labor-intensive, and lacks precision in dosage. While there are cases in the industry where fiber feeders have been introduced to reduce manpower and improve efficiency, the start-up and shutdown processes of these feeders are typically lengthy to minimize the impact of large vibrations on sensor readings, making it difficult to precisely control the stopping point of material feeding, resulting in low weighing accuracy. Furthermore, because fiber feeders use a vibratory feeding method, material accumulation is still possible, leading to inconsistent and uneven feeding. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of existing calibration technology and provide a high-precision fiber dispensing device and method with reasonable design, accurate measurement and good dispersion effect of two-stage metering.

[0004] The technical solution of this invention is: A high-precision fiber batching device with dual-stage metering includes a buffer feeding belt conveyor, a fiber feeder, and a precision weighing belt conveyor. The outlet of the buffer feeding belt conveyor is equipped with an arc gate discharge mechanism, which corresponds to the hopper of the fiber feeder. A coarse weighing device is installed at the lower end of the fiber feeder, and the outlet of the fiber feeder corresponds to the guide hopper of the precision weighing belt conveyor. An electric disperser is installed on the precision weighing belt conveyor, and the outlet of the precision weighing belt conveyor corresponds to the outlet vibrating screen. A precision weighing device is installed at the lower end of the precision weighing belt conveyor.

[0005] Furthermore: the arc gate discharge mechanism includes two arc gates and a pressure cylinder. The upper parts of the two arc gates are rotatably connected to the arc gate hopper body through hinge shafts. The upper ends of the two arc gates are connected by connecting rods. The lower end of one arc gate is connected to the piston rod of the pressure cylinder. The piston rod of the pressure cylinder extends and retracts, driving the two arc gates to move and complete the opening and closing.

[0006] Furthermore: the electric disperser includes a rotating shaft and a drive motor. The two ends of the rotating shaft are rotatably connected to the upper ends of two supports through bearing assemblies. Distributing teeth are provided at intervals along the radial and axial directions on the rotating shaft. The lower ends of the two supports are connected to both sides of the frame of the precision weighing belt conveyor. One end of the rotating shaft is connected to the drive motor.

[0007] Furthermore, the conveyor belt of the precision weighing conveyor is provided with skirts on both sides to form a skirted conveyor belt, and baffles are respectively provided on both sides of the upper end of the frame of the precision weighing conveyor. The combined use of the skirts and baffles effectively avoids material leakage during the weighing process.

[0008] Furthermore: the discharge port vibrating screen includes a hopper, the lower end of the hopper is provided with a screening grid, and a vibrator is provided on the outer wall of the hopper.

[0009] Furthermore: the fiber feeder includes a hopper, a frame, and a vibrator. The hopper is provided with a spiral feed channel, the upper end of the hopper is provided with a discharge port, the lower end of the hopper is provided with a frame, the lower end of the frame is provided with the coarse weighing device, and the vibrator is provided on the frame.

[0010] A high-precision fiber dispensing method using any of the aforementioned high-precision two-stage metering fiber dispensing devices includes the following steps: S1. Preparation: Adjust the positions of the buffer feeding belt conveyor, fiber feeder, precision weighing belt conveyor and discharge vibrating screen so that adjacent mechanisms can be connected in series. Debug the drive motor and pressure cylinder to ensure they can work normally. S2. Place the steel fiber on the conveyor belt of the buffer feeding belt conveyor and move with the belt conveyor. Through the pressure cylinder, open the two arc-shaped gates to let the steel fiber fall into the hopper of the fiber feeder. The coarse weigher monitors the weight of the steel fiber entering. When the set weight is reached, the pressure cylinder moves in the reverse direction to close the two arc-shaped gates and stop the steel fiber from entering the hopper. S3. The hopper of the fiber feeder vibrates under the action of the vibrator, causing the steel fibers to disperse and gradually move to the discharge port, and finally enter the guide hopper of the precision belt conveyor. S4. The steel fibers in the guide hopper fall onto the skirted conveyor belt and move together with the skirted conveyor belt. The rotating shaft of the electric disperser rotates, and the distributing teeth further disperse the steel fibers. S5. The steel fibers dispersed by the electric disperser fall into the vibrating screen at the discharge port. After being vibrated by the vibrator, they are finally discharged through the screen grid, completing one working cycle. S6. The arc-shaped gate is opened by the pressure cylinder to continue feeding material and achieve continuous operation.

[0011] Furthermore, in step S4, the rotation speed of the rotating shaft is adjusted according to the thickness of the steel fibers on the conveyor belt and the size of their own agglomeration.

[0012] The beneficial effects of this invention are: 1. This invention eliminates the influence of vibration and start / stop buffer symmetry of the fiber feeder by combining coarse weighing of the fiber feeder with fine weighing of the fine weighing belt conveyor, thereby greatly improving the accuracy of batching and realizing the automated operation of the entire batching process, reducing labor costs and improving work efficiency.

[0013] 2. The present invention sets an arc gate at the discharge port of the buffer feeding belt conveyor, and cuts off the feeding after the feeding is completed, which can prevent excess material from falling from the discharge port of the feeding belt conveyor due to vibration and other factors during the weighing process, thus affecting the weighing accuracy.

[0014] 3. The electric disperser on the precision weighing belt conveyor of this invention can disperse and spread the steel fibers on the belt, reduce the accumulation of steel fibers on the precision weighing belt conveyor, and further improve the weighing accuracy.

[0015] 4. The combined use of the skirted belt and the baffles on both sides of the precision weighing conveyor in this invention can effectively prevent material leakage during the weighing process and ensure weighing accuracy.

[0016] 5. The present invention sets a discharge port vibrating screen at the discharge port of the precision weighing belt conveyor, which further improves the dispersion uniformity of steel fibers added to concrete and improves the qualification rate of concrete after adding steel fibers.

[0017] 6. This invention is reasonably designed, has accurate measurement and good dispersion effect, high degree of automation, is easy to promote and implement, and has good economic benefits. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a high-precision fiber dispensing device with dual-stage metering. Figure 2 for Figure 1 Schematic diagram of the structure of the medium-buffered feeding belt conveyor; Figure 3 for Figure 2 Schematic diagram of the material discharge mechanism of the central arc gate; Figure 4 for Figure 1 Schematic diagram of the medium fiber feeder; Figure 5 for Figure 1 Schematic diagram of the Zhongjing conveyor belt; Figure 6 for Figure 1 Schematic diagram of the structure of the electric disperser; Figure 7 for Figure 1 A schematic diagram of the structure of the vibrating screen with the discharge port in the middle. Detailed Implementation

[0019] Example: See Figure 1 -- Figure 7In the diagram, 1-Buffer feeding belt conveyor, 2-Fiber feeder, 3-Precision weighing belt conveyor, 4-Electric disperser, 5-Discharge vibrating screen, 11-Drive motor, 12-Conveyor belt, 13-Tensioning mechanism, 14-Frame, 15-Arc gate discharge mechanism, 151-Arc gate hopper, 152-Connecting rod, 153-Pressure cylinder, 154-Arc gate, 155-Hinge shaft, 21-Hopper, 22-Discharge port, 23-Frame, 24-Coarse weighing device, 25-Vibrator, 31-Guide hopper, 32-Skirted conveyor belt, 33-Baffle plate, 34-Precision weighing device, 35-Drive motor, 36-Frame, 37-Tensioning mechanism, 41-Support, 42-Bearing assembly, 43-Rotating shaft, 44-Distribution teeth, 45-Drive motor, 51-Hopper, 52-Screening grid, 53-Vibrator.

[0020] A high-precision fiber batching device with dual-stage metering includes a buffer feeding belt conveyor 1, a fiber feeder 2, and a precision weighing belt conveyor 3. The outlet of the buffer feeding belt conveyor 1 is equipped with an arc gate discharge mechanism 15, which corresponds to the hopper 21 of the fiber feeder 2. A coarse weighing device 24 is installed at the lower end of the fiber feeder 2. The outlet 22 of the fiber feeder 2 corresponds to the guide hopper 31 of the precision weighing belt conveyor 3. An electric disperser 4 is installed on the precision weighing belt conveyor 3. The outlet of the precision weighing belt conveyor 2 corresponds to the outlet vibrating screen 5. A precision weighing device 34 is installed at the lower end of the precision weighing belt conveyor 3.

[0021] Specifically: The buffer feeding belt conveyor 1 includes a frame 14, a rotating roller is provided at the upper end of the frame 14, a conveyor belt 12 is mounted on the rotating roller, one of the drive rollers is connected to the drive motor 11, and the other drive roller is provided with a tensioning mechanism 13. The discharge end of the frame 14 is provided with an arc gate discharge mechanism 15.

[0022] The fiber feeder 2 includes a hopper 21, a frame 23, and a vibrator 25. The hopper 21 is provided with a spiral feed channel, the upper end of the hopper 21 is provided with a discharge port 22, the lower end of the hopper 21 is provided with a frame 23, the lower end of the frame 23 is provided with a coarse weighing device 24, and the vibrator 25 is provided on the frame 23 or the hopper 21.

[0023] The precision weighing belt conveyor 3 includes a frame 36, a rotating roller at the upper end of the frame 36, a skirted conveyor belt 32 fitted on the rotating roller, one of the drive rollers being connected to a drive motor 35, and a tensioning mechanism 37 being installed on the other drive roller. Baffles 33 are respectively installed on both sides of the upper end of the frame 36. The cooperation between the skirt and the baffles 33 effectively prevents material leakage during the weighing process.

[0024] During operation, the buffer feeding belt conveyor 1 is responsible for feeding material into the hopper 21 of the fiber feeder 2. Through weighing and calculation by the coarse weighing sensor 24, combined with the set maximum and minimum limits of material weight in the vibratory feeder, feeding can be automatically started when the material weight in the vibratory feeder hopper is less than the minimum limit, and feeding can be stopped when the maximum limit is reached. At the same time, the arc gate discharge mechanism 15 can cut off the feeding after the feeding is completed, preventing excess material from falling from the feed belt conveyor outlet into the fiber feeder 2 due to vibration and other factors during the weighing process, thus affecting the weighing results. Figure 3 The arc gate discharge mechanism 15 shown consists of an arc gate hopper 151, an arc gate 154, a connecting rod 152, and a pressure cylinder 153. There are two arc gates 154, and their upper parts are rotatably connected to the arc gate hopper 151 through hinged columns 155. The upper ends of the two arc gates 154 are connected by the connecting rod 152. The extension and retraction of the piston rod of the pressure cylinder 153 drives the connecting rod 152 to realize the opening and closing of the arc gates 154.

[0025] At the start of weighing, the fiber feeder 2 and the precision weighing conveyor 3 begin operation simultaneously. The fiber feeder 2 first causes the steel fibers to rise along a spiral track via vibration, falling from the discharge port 22 into the guide trough 31 of the precision weighing conveyor 3. The precision weighing conveyor 3 then transports the steel fibers to the vibrating screen 5 at the discharge port. According to... Figure 4 The crude sensor 24 shown is... Figure 5 The difference in weighing values ​​before and after the precision weighing sensor 34 shown can be used to calculate the weight of the material discharged from the batching station. When the weight of the discharged material is close to the target weight, the fiber feeder 2 stops, and the precision weighing belt 3 starts to decelerate. The remaining steel fibers on the precision weighing belt 3 are used for precision weighing until the target weight is reached, after which the system stops.

[0026] Figure 5 The Zhongjing weighing belt conveyor 3 is designed with a guide chute and side baffles. Since the skirt height of the skirt belt is generally not high and the hardness is limited, by covering the outside of the skirt with a baffle 33, the material blocking effect on both sides of the belt can be further improved, thereby ensuring that the steel fibers do not leak out during the weighing process and improving the weighing accuracy.

[0027] Figure 5 The electric disperser 4 on the precision weighing conveyor 3 shown can disperse and spread the steel fibers on the belt, reducing the accumulation of steel fibers on the precision weighing conveyor 3 and further improving weighing accuracy. (See attached structural reference for electric disperser 4.) Figure 6 It consists of a drive motor 45, a bearing assembly 42, a rotating shaft 43, a material distribution gear 44, and a support 41. The output shaft of the drive motor 45 drives the rotating shaft 43 to rotate, thereby causing the material distribution gear 44 to break up the steel fibers on the belt and achieve dispersed paving.

[0028] Structural reference of discharge port vibrating screen 5 Figure 7It mainly consists of a bucket body 51, a screening grid 52, and a vibrator 53. A discharge port vibrating screen 5 is set at the discharge port of the precision conveyor belt 3 to further improve the dispersion uniformity of the steel fibers added to the concrete and improve the pass rate of the concrete after adding steel fibers.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications made based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A high-precision fiber dosing device with double-stage metering, comprising a buffer feeding belt conveyor, a fiber feeder and a precision belt conveyor, characterized in that: The discharge port of the buffer feeding belt conveyor is equipped with an arc gate discharge mechanism, which corresponds to the hopper of the fiber feeder. A coarse weighing device is installed at the lower end of the fiber feeder, and the discharge port of the fiber feeder corresponds to the guide hopper of the precision weighing belt conveyor. An electric disperser is installed on the precision weighing belt conveyor, and the discharge port of the precision weighing belt conveyor corresponds to the discharge port vibrating screen. A precision weighing device is installed at the lower end of the precision weighing belt conveyor.

2. A two-stage metering high-precision fiber dosing device according to claim 1, characterized in that: The arc gate discharge mechanism includes two arc gates and a pressure cylinder. The upper parts of the two arc gates are rotatably connected to the arc gate hopper body through hinge shafts. The upper ends of the two arc gates are connected by connecting rods. The lower end of one arc gate is connected to the piston rod of the pressure cylinder. The piston rod of the pressure cylinder extends and retracts, driving the two arc gates to move and complete the opening and closing.

3. The high-precision fiber dispensing device with dual-stage metering according to claim 1, characterized in that: The electric disperser includes a rotating shaft and a drive motor. The two ends of the rotating shaft are rotatably connected to the upper ends of two supports through bearing assemblies. Distributing teeth are provided at intervals along the radial and axial directions on the rotating shaft. The lower ends of the two supports are connected to the two sides of the frame of the precision weighing belt conveyor. One end of the rotating shaft is connected to the drive motor.

4. The high-precision fiber dispensing device with dual-stage metering according to claim 1, characterized in that: The conveyor belt of the precision weighing conveyor is provided with skirts on both sides to form a skirted conveyor belt. In addition, baffles are provided on both sides of the upper end of the frame of the precision weighing conveyor. The combined use of the skirts and baffles effectively avoids material leakage during the weighing process.

5. The high-precision fiber dispensing device with dual-stage metering according to claim 1, characterized in that: The discharge port vibrating screen includes a hopper, a screening grid is provided at the lower end of the hopper, and a vibrator is provided on the outer wall of the hopper.

6. The high-precision fiber dispensing device with dual-stage metering according to claim 1, characterized in that: The fiber feeder includes a hopper, a frame, and a vibrator. The hopper is equipped with a spiral feed channel, and the upper end of the hopper is equipped with a discharge port. The lower end of the hopper is equipped with a frame, and the lower end of the frame is equipped with the coarse weighing device. The vibrator is mounted on the frame.

7. A high-precision fiber dispensing method using a high-precision fiber dispensing device with dual-stage metering as described in any one of claims 1-5, comprising the following steps: S1. Preparation: Adjust the positions of the buffer feeding belt conveyor, fiber feeder, precision weighing belt conveyor and discharge vibrating screen so that adjacent mechanisms can be connected in series. Debug the drive motor and pressure cylinder to ensure they can work normally. S2. Place the steel fiber on the conveyor belt of the buffer feeding belt conveyor and move with the belt conveyor. Through the pressure cylinder, open the two arc-shaped gates to let the steel fiber fall into the hopper of the fiber feeder. The coarse weigher monitors the weight of the steel fiber entering. When the set weight is reached, the pressure cylinder moves in the reverse direction to close the two arc-shaped gates and stop the steel fiber from entering the hopper. S3. The hopper of the fiber feeder vibrates under the action of the vibrator, causing the steel fibers to disperse and gradually move to the discharge port, and finally enter the guide hopper of the precision belt conveyor. S4. The steel fibers in the guide hopper fall onto the skirted conveyor belt and move together with the skirted conveyor belt. The rotating shaft of the electric disperser rotates, and the distributing teeth further disperse the steel fibers. S5. The steel fibers dispersed by the electric disperser fall into the vibrating screen at the discharge port. After being vibrated by the vibrator, they are finally discharged through the screen grid, completing one working cycle. S6. The arc-shaped gate is opened by the pressure cylinder to continue feeding material and achieve continuous operation.

8. The high-precision fiber dispensing method with two-stage metering according to claim 7, characterized in that: In step S4, the rotation speed of the rotating shaft is adjusted according to the thickness of the steel fibers on the conveyor belt and the size of their own agglomeration.

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