The loss-in-weight feeder is generally composed of main parts such as a feed gate, a weighing hopper, an agitator, a discharge device, a frame, a load cell, and a metering control device.
1. Feed gate
The feed gate is used to feed the weighing hopper, and ball valves, butterfly valves, gate valves, etc. are mostly used. Generally, the main focus is on its airtightness, switching flexibility, fast and smooth feeding and other performance indicators.
2. Weighing hopper
The weighing hopper is the carrier of the weighing material. The material selection should consider corrosion resistance and acid resistance. Its volume is selected according to the feeding amount in 3 minutes under the maximum feeding flow rate. The feeding time should account for the largest proportion of the entire weighing process. About 10%.
3. Stirrer
The agitator is mainly used for auxiliary unloading of materials with poor fluidity. It is generally composed of a simple drive motor for an arch breaking machine with helical blades or nail teeth. Materials can fall smoothly to the outlet.
4. Discharging device
The discharge device is used to discharge the bulk materials in the weighing hopper. According to the characteristics of the conveyed materials and the different use environments, screw feeders, impeller feeders, vibrating feeders, and belt feeders can be used. In most applications, the screw feeder is superior to other closed discharge devices. It can not only convey the material evenly, but also prevent the flying and spraying of the powdery material.
5. Rack
The rack is the support of other equipment and devices, and the load cell is installed on it.
6. Load cell
The load cell is the core weighing component of the weight loss scale, and it mostly uses a strong high-resolution strain gauge sensor, which converts the weight signal of the material into an electrical signal for output.
7. Metering control device
The metering control device is composed of an intelligent weighing instrument and an automatic control system, which is used to control and measure the feeding rate and conveying volume.
In addition, the inlet and outlet of the loss-in-weight scale should generally adopt flexible dust-proof and air-tight soft connections to ensure that the connection between the storage bin and the subsequent equipment does not hinder weighing. The weighing hopper of the loss-in-weight scale and the adjustable discharge device installed under it are all located on the load cell fixed with the frame.