WELCOME TO CALL US (+86) 18203311200 E-mail: admin@tehold-machine.com
In a rice milling plant, the separation of unhulled paddy from brown rice is a decisive step. If unhulled paddy passes into the whitening machine, it is crushed, creating brokens and reducing the value of the final product. If too much brown rice is returned to the husker, the mill loses capacity and wastes energy. The paddy separator machine for rice mill solves both problems by accurately separating grains according to density, size, and surface characteristics.
Tehold International has engineered separators that deliver high efficiency, low recirculation, and stable operation. These machines are designed to work seamlessly with a paddy husker rice milling machine, forming a closed-loop husking and separation circuit. This article provides a complete guide to the Tehold separator, including working principles, technical specifications, maintenance, troubleshooting, and future innovations.
Paddy and brown rice differ in specific gravity. Brown rice is denser because the husk has been removed. Paddy is lighter because the husk contains air and fibrous material. A paddy separator machine for rice mill uses this difference to separate the two streams.
The machine combines three physical actions. First, an oscillating deck moves the grain mixture forward. Second, air is blown upward through the deck, causing the grain bed to fluidize. Third, specially designed screens and weirs direct the lighter paddy to one outlet and the heavier brown rice to another.
The process is continuous. Material enters the top of the deck and travels downward as the deck oscillates. The air flow keeps the bed loose, allowing denser grains to sink and lighter grains to rise. The separation is not based on a single factor but on the combined effect of density, size, shape, and friction.
Without a paddy separator machine for rice mill, a rice mill would have to rely on manual recirculation or accept lower quality. Both options are unacceptable in modern commercial milling.
First, the separator protects the whitening machine. Unhulled paddy is hard and abrasive. If it enters the whitener, it can damage the emery roller and create excessive bran. It also produces broken kernels that reduce head rice yield.
Second, the separator improves husker efficiency. By returning only unhulled paddy to the paddy husker rice milling machine, the separator prevents brown rice from being reprocessed. This reduces wear on rubber rolls and saves energy.
Third, the separator improves product consistency. When the brown rice stream is clean, the whitener can operate at a steady pressure, producing uniform whiteness and fewer brokens.
Fourth, the separator reduces dust and husk content in the milling stream. The aspiration system removes light husk particles and fines, improving the working environment and reducing fire risk.
Tehold International’s paddy separator machine for rice mill is built around a dynamically balanced oscillating deck. The deck is driven by an eccentric shaft supported by heavy-duty bearings. This design reduces vibration and extends the life of the machine frame.
The deck is divided into multiple sections. Each section has a specific screen mesh and air flow. The angle of the deck can be adjusted while the machine is running, allowing operators to fine-tune separation without stopping production. The air flow is controlled by a variable frequency drive, so the fan speed can be matched to the feed rate and grain characteristics.
The separator also includes adjustable weirs. These weirs control the depth of the grain bed and the position of the separation line. By moving the weirs, operators can change the purity of the brown rice outlet and the recirculation rate.
Tehold separators are available in capacities from 2 tons per day to 25 tons per day. Larger capacities can be achieved by using multiple units in parallel or by selecting a custom-built model.
The paddy husker rice milling machine and the paddy separator machine for rice mill must be properly matched. If the husker capacity is much higher than the separator capacity, the separator will be overloaded. If the separator capacity is much higher, it will run inefficiently and waste air.
Tehold International sizes the husker and separator as a pair. For example, a TH-HK-2000 husker is matched with a TH-PS-2000 separator. The husker produces a mixture of brown rice, husk, and paddy. The separator receives this mixture, removes the husk through aspiration, and separates the paddy from the brown rice.
The recirculation rate is a key performance indicator. In a well-adjusted system, the recirculation rate should be between 5% and 10%. If it is higher, the husker may need adjustment or the separator may need tuning. Tehold’s control system can display recirculation rate in real time on the optional touchscreen panel.
The following table shows representative Tehold International paddy separator machine for rice mill models.
Model | Capacity t/h | Deck Area m² | Motor kW | Fan Motor kW | Separation Efficiency | Recirculation Rate | Weight kg |
|---|---|---|---|---|---|---|---|
TH-PS-1 | 1–1.5 | 2.4 | 0.75 | 1.1 | 98.0–98.5% | 8–12% | 420 |
TH-PS-3 | 3–4 | 4.2 | 1.5 | 2.2 | 98.5–99.0% | 7–10% | 780 |
TH-PS-6 | 6–8 | 7.0 | 2.2 | 4.0 | 99.0–99.2% | 6–9% | 1,350 |
TH-PS-12 | 12–15 | 11.5 | 4.0 | 7.5 | 99.2–99.4% | 5–8% | 2,200 |
TH-PS-25 | 25–30 | 18.0 | 7.5 | 11.0 | 99.3–99.5% | 4–7% | 3,800 |
These models can be supplied as standalone units or integrated into a complete rice milling line with a paddy husker rice milling machine, whitener, polisher, and grader.
To evaluate a paddy separator machine for rice mill, millers should track several metrics.
Separation efficiency is the percentage of unhulled paddy removed from the brown rice stream. It is calculated by taking samples from the brown rice outlet and measuring the paddy content. Tehold aims for 99% or higher.
Recirculation rate is the percentage of brown rice that is incorrectly returned to the husker. It is calculated by sampling the recirculation stream and measuring brown rice content. A low recirculation rate means the separator is working accurately.
Capacity is the amount of material the separator can process per hour while maintaining efficiency. If capacity is increased beyond the design limit, efficiency drops.
Air flow is measured in cubic meters per minute. Too much air causes brown rice to be carried into the paddy outlet. Too little air causes paddy to remain in the brown rice outlet.
Deck angle affects the speed at which material moves across the deck. A steeper angle increases capacity but reduces separation time. A shallower angle improves separation but reduces capacity.
Tehold International recommends the following practices to optimize the paddy separator machine for rice mill.
First, maintain a consistent feed rate. Surging feed causes the grain bed to become uneven, which reduces separation efficiency. Use a vibratory feeder or a surge bin to stabilize the flow.
Second, match air flow to grain conditions. Wet paddy is heavier and requires more air. Dry paddy is lighter and requires less air. Adjust the fan speed accordingly.
Third, inspect screens regularly. Blinded screens reduce air flow and cause paddy to remain in the brown rice stream. Clean screens daily and replace them when damaged.
Fourth, check the deck drive. Worn bearings or a loose eccentric drive can reduce the oscillation stroke, which lowers separation efficiency. Lubricate bearings according to the manual.
Fifth, coordinate with the husker. If the paddy husker rice milling machine is producing too many brokens, the separator will have difficulty. Adjust the husker roll gap and pressure to produce a clean, uniform mixture.
A paddy separator machine for rice mill has fewer wear parts than a husker, but regular maintenance is still important.
Component | Typical Lifespan | Maintenance Action | Effect of Neglect |
|---|---|---|---|
Screens | 2,000–4,000 hours | Clean daily, replace when torn | Reduced efficiency |
Deck bearings | 10,000–15,000 hours | Lubricate every 500 hours | Vibration and noise |
Eccentric drive | 15,000–20,000 hours | Check alignment and lubrication | Reduced stroke |
Fan bearings | 12,000–18,000 hours | Lubricate or replace | Low air flow |
Weir plates | 5,000–8,000 hours | Inspect for wear | Poor separation control |
Flexible connections | 12–24 months | Replace if cracked | Dust leakage |
Tehold International stocks genuine spare parts for all separator models. We also provide maintenance training for mill operators.
Problem: Brown rice contains too much paddy.
Solution: Increase air flow slightly, reduce deck angle, or lower feed rate. Check screen condition.
Problem: Paddy outlet contains too much brown rice.
Solution: Reduce air flow, increase deck angle, or adjust weir position.
Problem: Low capacity.
Solution: Increase deck angle, increase air flow, or check for screen blinding.
Problem: Excessive vibration.
Solution: Inspect deck bearings, eccentric drive, and foundation bolts. Balance may be required.
Problem: Dust escaping from the machine.
Solution: Check flexible connections, aspiration ducts, and filter bags.
Problem: Inconsistent separation.
Solution: Stabilize feed rate, check paddy moisture, and verify that the paddy husker rice milling machine is producing a uniform mixture.
Q1: What is the difference between a paddy separator and a destoner?
A: A destoner removes stones and heavy impurities. A paddy separator machine for rice mill separates unhulled paddy from brown rice. They perform different functions in the milling line.
Q2: Can a paddy separator machine for rice mill handle different rice varieties?
A: Yes. Adjustments to air flow, deck angle, and weir position allow the machine to handle long-grain, medium-grain, and short-grain rice. Tehold provides recommended settings.
Q3: How does the separator connect to the paddy husker rice milling machine?
A: The separator receives the husker outlet. Unhulled paddy is returned to the husker by a bucket elevator or pneumatic system. Brown rice moves forward to the whitener.
Q4: What is a good separation efficiency?
A: Tehold International considers 99% or higher to be good. Below 98% indicates a problem that should be corrected.
Q5: How often should screens be replaced?
A: Every 2,000 to 4,000 hours, depending on paddy quality and maintenance. Torn or blinded screens should be replaced immediately.
Q6: Does Tehold International provide installation support?
A: Yes. We provide layout drawings, installation supervision, commissioning, and operator training for complete rice milling plants.
Tehold International is developing next-generation separation technology. One promising direction is the use of optical sensors to detect unhulled paddy in the brown rice stream. A small air jet can then eject the paddy individually. This hybrid approach could raise separation efficiency to 99.9% and reduce reliance on mechanical oscillation.
Another development is the use of smart control systems. The paddy separator machine for rice mill will communicate with the paddy husker rice milling machine to optimize the entire husking circuit. If the separator detects a high recirculation rate, it will signal the husker to adjust roll pressure. If the husker detects a change in paddy moisture, it will signal the separator to adjust air flow.
Tehold is also working on energy-efficient fans and low-vibration deck designs. These improvements will reduce power consumption and maintenance costs. For millers, the future separator will be quieter, more efficient, and easier to operate.
The paddy separator machine for rice mill is a vital link between husking and whitening. It protects downstream equipment, improves yield, and ensures consistent product quality. Tehold International designs separators that deliver high efficiency, low recirculation, and reliable operation. When paired with a Tehold paddy husker rice milling machine, the separator completes a husking circuit that maximizes brown rice recovery and minimizes waste.
Whether you are building a new rice mill or upgrading an existing one, Tehold International can help you select the right separator and husker configuration. Our team provides technical consultation, installation support, operator training, and genuine spare parts. Contact Tehold International today to learn how our separation technology can improve your milling efficiency and profitability.
