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Transfer points
Published in D.V. Subba Rao, The Belt Conveyor, 2020
Vibrating feeders (Figure 8.7) consist of steel pan or feed chute, which is freely supported or suspended and is vibrated electromagnetically in a direction oblique to its surface. The material in the pan is moved along the pan surface by this type of vibration. Its rate of movement depends on the amplitude and frequency of the vibration. Normally, a vibrating feeder is positioned under the opening in the bottom of a hopper or a hole under a storage pile. Vibrating feeders are useful for handling a wide range of materials. They are not suitable for fine materials of size −150 mesh and sticky cohesive materials.
Feeding
Published in Ko Higashitani, Hisao Makino, Shuji Matsusaka, Powder Technology Handbook, 2019
Vibrating feeders use either electromagnetic or electromechanical drives. Figure 5.5.6 shows an electromagnetic vibrating feeder. The vibrating trough transports the particles smoothly. The vibration frequency is selected near the resonance frequency.13 The flow pattern in the feed hopper is affected by the type or design of the feeder. For fine powders, an appropriate system is necessary to prevent flushing. The dynamic characteristic is represented by a first-order model with time delay.14
Study of raw coal identification method by dual-energy X-ray and dual-view visible light imaging
Published in International Journal of Coal Preparation and Utilization, 2023
Lei He, Shuang Wang, Yongcun Guo, Kun Hu, Gang Cheng, Xinquan Wang
The main equipment for obtaining X-ray transmission images of clean coal, gangue, and pseudo-medium coal was a dual-energy X-ray source of model CISSY 16 from Weijie Technology Co. The source voltage was 160 kV, and the current was 2 mA, with the detector’s resolution being 1.5 The principle of acquiring the dual-view images of X-ray pre-discharge waste gangue and pseudo-medium coal was shown in Fig. 3. The material entered the vibrating feeder through the feed hopper, and the vibrating feeder fed the fabric evenly to the belt machine. At the end of the belt machine, two-line scan cameras were at the top and bottom, which imaged the front and back sides of the material in the unloading trajectory plane, respectively. Each line scan camera was equipped with a lengthy blue background. In addition, the whole scanning imaging area was equipped with a fill light source to enhance the material surface information.
On the separation mechanism of high vibration frequency compound dry separator and multi-parameter optimization
Published in International Journal of Coal Preparation and Utilization, 2023
Yadong Zhang, Miao Pan, Ziyi Guo, Zhibin Guo, Haishen Jiang, Chenlong Duan, Hui Deng, Yuemin Zhao, Bo Zhang, Zengqiang Chen
The experimental compound dry separation system is shown in Fig. 1, which mainly comprises a vibrating feeder, a compound separator, a blower system, an air distribution room, a vibration test system, a circuit control system, and a product collector. The air velocity of the blower can be adjusted in the range of 0-5 m/s. The excitation force of one vibration motor can be adjusted in the range of 0-3000N, and the vibration frequency can be adjusted in the range of 0-50 Hz. And the bed area is 0.3 m2. The coordinate system was established with the bed surface as the plane. The z-axis direction represented the direction perpendicular to the bed surface, the x-axis direction represented the moving direction of the gangue, and the y-axis direction represents the moving direction of the clean coal. The three-channels acceleration sensor was fixed at the feeding end and the gangue discharge end respectively. The vibration signals of different regions on the bed surface were obtained through the data acquisition system, and the displacement signals of the measuring point could be obtained by secondary integration of the acceleration signals. In this way, the motion trajectories of different bed regions were reconstructed to clarify the distribution of vibration energy on the bed. In this experiment, the PCB-208 impact force sensors produced by PCB Piezotronics Company in the United States were used to measure the impact force signal of the bed under different conditions. The maximum measurement value is 0.45 N, and the measurement accuracy is ± 0.5% FS. In addition, a high-speed camera system (i-Speed III, Olympus, Japan) was utilized to obtain online synchronous pictures of the test process while recording the pressure drop signals. In order to ensure the clear and accurate recording of the movement of particles using the camera, the camera frame rate was set to 32 fps/s, and the sampling time was set to 20 s.