Dosing and mixing are critical processes in the compound feed mill, directly influencing the yield, quality, and energy consumption of the final product. The dosing process involves accurately weighing various feed ingredients according to the formula, which is the core of feed production. Mixing, on the other hand, is the key step that ensures all materials are uniformly blended, ultimately determining the mill's production capacity and product quality. Therefore, improving feed yield and quality requires focused research on the dosing and mixing systems.
**1. Constraints of the Dosing and Mixing System**
**1.1 Relationship between Dosing, Mixing Cycle, and Production**
The entire cycle time (T) starts from the first ingredient being fed, through the last material being added, into the mixer for full blending, and ends when the mixed product is discharged. This total time is crucial for production planning. Typically, in feed mill design, T is set at 6 minutes, allowing 10 batches per hour. However, factors such as different ingredients, mixing methods, batching scales, mixers, feeders, and silos can affect this cycle time. By studying these constraints, feed mills can optimize feeder and silo configurations, select appropriate batching scales and mixers, and achieve the best cycle time, thereby increasing production, ensuring quality, and reducing energy use. For example, a mill with a 1-ton batch scale and mixer, operating at T=6 minutes, produces 10 tons per hour. If the cycle is reduced to 5 minutes, output increases to 12 tons per hour. Different cycles lead to varying production capacities, as shown in Table 1.
The power consumption for pelleted feed is generally around 30 kWh per ton. With a 20% increase in output, this can drop to approximately 26.5 kWh per ton, resulting in over a 10% reduction in energy use.
Therefore, shortening the dosing and mixing cycle through technical upgrades is an effective way to boost production and lower energy costs.
**1.2 Main Factors Affecting the Dosing and Mixing Cycle (T)**
As shown in Figure 1, the overall cycle time (T) depends on several stages: t (dosing time), T1, T2, T3, and T4 (mixing and related steps). These operations can run in parallel. To reduce T, t and T1–T4 must be minimized simultaneously. If t exceeds the sum of T1+T2+T3+T4, the mixer may idle or require artificial extension of mixing time. Hence, it is usually necessary for t ≤ T1+T2+T3+T4.
**2. Research on Batching Process Technology**
**2.1 Feeders**
Feeders in the batching section are essential components that ensure accurate weighing and help reduce batching time (t). Common types include electromagnetic vibratory feeders, impeller feeders, and screw feeders. Among these, screw feeders are the most widely used. They utilize advanced control methods, such as fast feeding, slow feeding, and jogging feeding, to maintain high batching accuracy.
**2.1.1 Appropriate Equipment for Capacity and Speed**
Materials with large volume and proportion in the formula are stored in large silos and paired with high-speed feeders, while smaller quantities go into small silos with slower feeders. Medium-sized materials use medium-speed feeders. Some feeders can even operate at different speeds depending on the raw material. During upgrades, increasing the speed of screw feeders (within safe limits) can shorten the batching time. For instance, in a 10-ton-per-hour feed mill, the original design used 15 feeders with a 5-minute batching time. By increasing the screw feeder speed, the time was reduced to 4 minutes, as shown in Table 2.
Electric Screw Driver
Suitable for different soil types
Cost saving and Saving time
Short assembly time and Quick mounting
Immediately loadable and Quick changes of position
HD Model 20,for installing Ground Screw sizing of 76x1200mm or smaller ;mainly applied for mounting garden fences, safety fences, traffic sign post and advertising boards.HD Model 30 and Model 50,for installing ground screw sizing of 89x2000mm or smaller ;mainly applied for solar farm construction, carports, flagpoles, sun shading ,wooden houses and playground facilities.
This Electric ground screw drivers are designed to install or remove various sizes and types of ground screws.This driver is shipped completely assemble.There is a reverser on the handle of host machine.When we push the reverser,the host machine will contrarotate,Then ground screw will be drilled out.When the ground screw work normally,the adjusting knob of control instrument can be adjusted to maximun.It can ensure the host machine output the biggest torque.
features
1,high quality ground screw electric-driver
2,easy and fast install
Mini Screw Driver,Ground Screw Driver,Electric Screw Driver
Hebei Honde Plastic & Metal Co., Ltd. , https://www.foundation-system.com