Powder Fertilizer Packing Machine

Equipment introduction

The powdered fertilizer packaging machine, also known as the powder quantitative packaging scale, is a special automated equipment for the packaging of organic fertilizers, water-soluble fertilizers, and inorganic powdered fertilizer products. It adopts the core solution of spiral double-speed feeding + weighing and measurement to specifically solve the industry pain points such as powders that are prone to dust, moisture absorption and caking, large measurement errors, and strong corrosiveness.

(1) Two mainstream models (special for fertilizers)

1. Open bag powder packaging machine: suitable for 20-50kg woven bags and paper bags, equipped with sewing machine, suitable for large-volume packaging of organic fertilizer powder and phosphorus and potassium raw material powder;
2. Valve bag powder packaging machine: automatic pressure filling, self-sealing bag without sewing, extremely low dust, suitable for high-value powder fertilizers such as monoammonium phosphate and water-soluble fertilizer.

(2) Core advantages

1. Accurate measurement: fast and slow double screw feeding, dynamic weighing error ±0.3%~±1%, meeting agricultural input measurement regulations;
2. Anti-corrosion and dust-proof contact materials: 304/316 stainless steel, fully enclosed filling + negative pressure dust collection, workshop dust meets standards;
3. The anti-blocking and anti-bridging silo has built-in vibration arch breaking and stirring devices to solve the problem of moisture absorption and bridge building of fertilizers that prevents unloading;
4. High degree of automation, automatic bagging, hemming, bag sewing, and palletizing linkage are optional, reducing 3–4 operators in a single shift;
5. Suitable for various bag types such as woven bags, cowhide valve bags, and inner membrane composite bags. The measuring range is adjustable from 10 to 100kg.

Complete Equipment Structure

The entire machine is divided into five main modules: a material storage and arch-breaking unit, a screw feeding and metering unit, a weighing and bag clamping unit, a dust removal and conveying auxiliary machine, and an electrical control system.

1. Material Storage and Buffer Silo: Large-capacity carbon steel silo with a Teflon anti-stick coating on the inner wall, a vibrating arch-breaking motor on the side wall, and an internal stirring rod. It is linked to a high and low level gauge and a front-end elevator for automatic material replenishment.
2. Double Screw Feeding Mechanism (Core Metering Component): Coarse screw (rapidly fills 80% of the target weight) + fine screw (micro-feeding with precise control), frequency conversion independent speed regulation; the screws are polished for wear resistance and are resistant to acid, alkali, and fertilizer corrosion.
3. Weighing and Bag Clamping Assembly: High-precision cantilever weighing sensor, independent weighing hopper (net weight type) / hanging bag weighing frame (gross weight type); pneumatic widened clamps, and a ring-shaped sealed dustproof skirt to completely cover the bag opening during filling to prevent powder spray.
4. Supporting Auxiliary Equipment: Negative pressure pulse dust collector, belt conveyor, column-mounted bag sewing machine/heat sealing machine, automatic bag loading robot (optional), bag leveling machine.
5. PLC Intelligent Control System: Touchscreen operation, stores multiple fertilizer formulas, features automatic zero-point calibration, over-tolerance audible and visual alarms, production statistics, and fault self-diagnosis functions. The entire machine is reliably grounded to prevent static electricity, dust, and explosions.

Working Principle

Utilizing a dual-speed screw feed + closed-loop weighing compensation process, the entire filling process is dust-free and sealed:

1. A bucket elevator at the front end feeds powdered fertilizer into a buffer hopper, where a vibrating motor continuously breaks up clumps to prevent material bridging and breakage.
2. After manual/mechanical gloves are put into bags, a cylinder automatically clamps the bag opening, and a dust-collecting skirt adheres to the bag opening to activate negative pressure dust collection.
3. PLC controls the coarse screw to feed at high speed. When the set weight is reached (80%), the coarse screw stops, and a fine screw is switched to provide micro-feeding.
4. A weighing sensor provides real-time weight feedback, and the fine screw is cut off 0.5 seconds in advance to compensate for the material’s inertial impulse. Once the standard weight is reached, all screws stop.
5. The bag-clamping cylinder releases, and the bag filled with powder falls onto a belt conveyor, which transports it to the sealing station for sealing. The finished product is then transferred to the warehouse.
6. Dust generated during filling is drawn into a dust collector by a ring-shaped dust collection hood for filtration and recovery. Fine powder is returned to the hopper without waste.

Applicable Raw Materials for the Equipment

The powder fertilizer packaging machine is mainly suitable for the following types of materials:

Material Adaptability Requirements:

1. Suitable for powdery, powder-granular mixtures, and flake materials.
2. Suitable for uniform fine granules and non-sticky powder materials.
3. For materials with a certain degree of moisture, or those that are loose or sticky, a special model (such as the XYC-P series) must be selected.
4. For materials with poor flowability, a belt-type graded feeding or a double-screw forced feeding method must be used.

Equipment Application in Production Lines

1. Core Position in Powdered Organic Fertilizer Production Lines

The powdered fertilizer packaging machine is the final, final piece of equipment in the entire powdered organic fertilizer production line.

Complete Processing Flow:

Livestock/Poultry Manure/Straw/Biogas Sludge → Fermentation Treatment (Combustion Turner) → Raw Material Crushing (Semi-Wet Material Crusher) → Screening and Grading (Drum Screen) → Automatic Packaging (Powdered Fertilizer Packaging Machine)

The powdered organic fertilizer production line eliminates the need for granulation and drying equipment. The equipment is simple to configure, has low investment costs, a small footprint, and a short commissioning period. As the final piece of equipment, the packaging machine directly determines whether the finished product can successfully enter the market.

2. Application in Powdered Water-Soluble Fertilizer Production Line

The complete process of a fully automated powdered water-soluble fertilizer batching and packaging production line is as follows: Manually pour raw materials into the low-level raw material silo → Automatic bucket elevator lifts the material to the high-level batching and storage silo → Automatic batching according to the formula (electronic weighing) → Automatic unloading to the mixer → Automatic uniform mixing → Automatic unloading to the quantitative packaging machine hopper (automatic material level control) → Manual bagging → Automatic weighing and metering by a screw scale → Automatic filling → Automatic bag dropping → Conveying → Inner bag heat sealing → Outer bag sewing

3. Supporting Equipment

Powdered fertilizer packaging machines typically require the following equipment:

Feeder/Screw Elevator: Lifts materials to the packaging machine hopper

Conveying Device: Conveys the packaged finished product to the sealing station

Bag Sewing Machine/Sealing Machine: Completes the sealing of the packaging bags

Dust Removal Equipment: Controls dust during the packaging process

Air Compressor: Provides compressed air for pneumatic actuators

Standard Operating Procedures and Full-Cycle Maintenance Methods

(I) Standard Start-up and Shutdown Procedures

Start-up

1. Check that the hopper and screw conveyor are free of clumps, the dust collector filter is intact, the sensors are free of powder accumulation, and the equipment is reliably grounded;
2. First, start the dust collector and vibratory arch-breaking motor, run the screw conveyor unloaded for 3 minutes, and confirm that the rotation direction is correct;
3. Call up the corresponding fertilizer formula on the touch screen, complete the zero-point calibration, and then begin bagging production.

Shutdown

1. Stop the front-end feeding and wait for all material in the hopper and screw conveyor to be emptied;
2. Sequentially shut down the screw conveyor, dust collector, and conveying equipment, and clean any residual powder from the weighing hopper and bag clamping area;
3. For long-term shutdowns, loosen the bag clamping cylinder and protect the sealing dustproof skirt.

(II) Graded Maintenance Standards

1. Wipe the load cell and clean the dust from the bag daily; check the dust collector pressure differential; calibrate the zero point every shift.
2. Disassemble the auger weekly to clean the adhering material, check the wear of the auger blades, and add grease to the cylinder.
3. Replace the dust collector filter element monthly; tighten the drive chain and motor bolts; clean the dust from the electrical control box.
4. Replace all gear oil in the reducer every 4 months; replace aged sealing skirts and air pipe joints.

(III) List of Vulnerable Parts

Auger blades, load cell, dust collector filter bag, dustproof sealing skirt, cylinder seal ring, V-belt, solenoid valve.

Common Faults, Causes, and Standardized Solutions

Comprehensive Technical Features of the Equipment:

1. Compliant Metering: Dual-speed spiral dynamic weighing ensures accuracy meets national agricultural input measurement standards, preventing customer complaints.
2. Environmentally Friendly, Dust-Free, Fully Enclosed Filling + Negative Pressure Dust Removal: Meets environmental protection standards for high-dust powder fertilizer production.
3. Corrosion-Resistant and Durable: Made of corrosion-resistant and durable stainless steel, suitable for long-term use with acidic and high-salt inorganic fertilizers.
4. Anti-Clogging, Stable Vibration + Agitation for Double Arch Breaking: Solves the problem of moisture absorption and bridging in organic fertilizer powder.
5. Automated and Flexible: Can be used with a single machine for easy filling or as part of a fully automated palletizing line, significantly reducing labor costs.
6. Easy Maintenance: Modular spiral and weighing components allow for cleaning and parts replacement by a single person.