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1. Structural characteristics For mechanical products, the functional characteristics are closely related to their structural characteristics. First, the internal structure of these two products is briefly introduced:
The key function of the impeller feeder is a feeding wheel with intersecting blades. The structure is shown in Figure 1. The automatic feeder is mainly composed of a shallow long groove feeding wheel and an adjustable feeding door. as shown in picture 2.
2. Working principle The commonality of the two feeders is that they need to adjust the feeding amount according to the load condition of the crusher, and serve to maximize the energy efficiency of the crusher. The following describes their respective work processes:
The principle of the impeller feeder is relatively simple, and the feeding amount can be relatively stable under the condition of constant feeding frequency. The control can be done manually or automatically via a PLC. In the manual control mode: the worker adjusts the feeding frequency according to the experience and the load condition of the pulverizer, so as to control the feeding speed by the speed of the feeding wheel, when the pulverizer load slowly rises to about 98% of the rated load. Suspend the feeding frequency and increase or decrease according to the fluctuation range of the working current of the pulverizing motor. Under normal circumstances, the working current should be slightly less than the rated current, and its peak value should be controlled within 120% of the rated value. In the automatic control mode: the PLC adjusts the feeding frequency in real time according to the detected working current value of the pulverizer, and realizes the real-time adjustment of the pulverizer feeding amount through a closed-loop control system, thereby ensuring that the pulverizer is in a “full load†working state. To maximize the capacity and efficiency of the crusher.
The principle of the automatic feeder is shown in Figure 3. The control process must involve PLC.
The sensor detects the working current of the pulverizer in real time and transmits the signal to the feeder control unit; by comparing the set current with the detected value and outputting the control signal, the opening degree of the feeding door and the rotating speed of the variable frequency motor are changed, thereby The purpose of automatically controlling the feed amount is achieved. Adjusting the opening degree of the feeding door can control the approximate range of feeding amount; changing the feeding wheel speed can finely adjust the feeding amount, so that the adjustment precision and the reflecting time rate can be effectively improved.
3. Performance characteristics From the analysis of the above two sections and a large number of field application practice cases:
The impeller feeder has a simple control method and is difficult to operate, and can be widely used in feed and grain processing plants. However, it has its own technical vacuum zone: 1. It is not possible to finely adjust the feed amount by adjusting the impeller speed. When processing some raw materials with high difficulty in crushing, the current fluctuation will be relatively large, which will reduce the capacity and efficiency of the crusher; The gap between the feeding roller and the adjusting plate is difficult to control, especially when processing a material with a high hardness, there is a hidden danger that the feeding wheel is stuck.
The automatic feeder adopts the working current value of the pulverizer as the control basis, and adjusts the feeding amount of the pulverizer in real time by changing the rotation speed of the variable frequency motor and the opening degree of the feeding door, and the adjustment speed and precision are remarkably improved; the feeding wheel adopts The shallow long groove significantly reduces the possibility of material jamming in the tank.
4. Summary In summary, the impeller feeder belongs to a traditional feeding device, which is easy to install and maintain, and the control model is simple and easy to operate, and has a wide application range. The automatic feeder improves the structure of the feeding stick, and an adjustable feeding door is added to accelerate the feeding adjustment speed, improve the adjustment precision and system stability, and effectively improve the production efficiency of the pulverizer and reduce the pulverization. The system produces energy consumption. It is believed that with the further promotion of intensive large-scale production mode, the automatic feeder will replace the traditional impeller feeder, becoming a popular “new star†in the crushing feeding system, saving energy and improving Make outstanding contributions to productivity!
Difference analysis between automatic feeder and impeller feeder
During the working process of the pulverizer, the upstream feeding speed is too fast or the adjustment is not timely, resulting in overload or even blocking the machine. The feeding speed is too slow and the performance is low, and the feeder plays a crucial role in the working process. Important role. This paper analyzes and compares the two feeding devices commonly used in the feed processing industry, the automatic feeder and the impeller feeder, to reveal their performance differences and guide the process application.