how to make Liquid fertilizers filling machine factory

The characteristics of liquid fertilizers are that they are highly corrosive (containing nitrogen / phosphorus / potassium / trace elements), somewhat viscous / containing particles, and prone to foaming. They differ significantly from common liquids such as beverages and alcoholic drinks. The materials, configurations, and processes of the filling machines need to be specifically adapted to suit them. This is divided into selection precautions and usage precautions, covering the entire process from equipment selection to daily production.

1. Material selection: Corrosion resistance is the primary principle, which directly determines the service life of the equipment.

The chemical composition of liquid fertilizers can corrode ordinary metals. Therefore, all components in contact with the fertilizer must be made of 304/316 stainless steel. The core components are preferably made of 316 stainless steel (with stronger corrosion resistance, suitable for water fertilizers containing strong acids and strong alkalis). Specific requirements are as follows:

Contact parts: Filling head, storage tank, discharge pipe, flow meter, pump body - all made of stainless steel, no iron or ordinary carbon steel materials;

Sealing parts: Use polytetrafluoroethylene (PTFE) and nitrile butadiene rubber (NBR), to avoid ordinary rubber sealing parts being corroded by fertilizers and leaking or aging;

Frame: Ordinary carbon steel can be spray-painted for protection (for non-contact parts), but it needs to be treated for rust prevention to avoid rusting in the workshop due to dampness.

2. Select the appropriate filling machine based on the type of fertilizer

Different liquid fertilizers require different filling machines. The core selection criteria are based on viscosity, whether they contain particles, and filling accuracy. Here are the mainstream models and their corresponding application scenarios, simply matching them up:

Filling machine modelCore configurationAdapted fertilizer typeFilling accuracyApplicable production capacity

Piston-type filling machineStainless steel piston, anti-block discharge portThick liquid fertilizer, paste fertilizer, suspension fertilizer (with particles ≤ 5mm)±1mlSmall batch (500 - 2000 bottles / hour)

Flowmeter-type filling machineStainless steel turbine flowmeter, variable frequency pumpClear liquid fertilizer, low viscosity water fertilizer (without particles)±0.5mlMedium batch (2000 - 5000 bottles / hour)

Weighing-type filling machineHigh-precision weighing sensor, shock-proof hopperAll liquid fertilizers (especially for large-batch filling, such as 20L/50L)±2gLarge-batch filling (100 - 500 barrels / hour)

Fully automatic straight-line filling machineWith multiple filling heads, bottle sorting machine, and cap sealing machine联动Clear liquid fertilizer / low viscosity fertilizer (large-scale production)±0.5mlBig batch filling (5000 bottles / hour or more)

Key reminder： If filling a suspension fertilizer with particles， the manufacturer must design anti-block measures (such as increasing the discharge port， installing a stirring device， or equipping the filling head with a non-blocking brush) to avoid particle blockage in the filling head， which could lead to leakage or inaccurate filling accuracy.

3. Core Configuration:

Manufacturers often reduce the core components to lower the price, and these components are prone to failure later. The following core configurations must be clearly specified in the contract regarding brand / specifications, without any compromise:

Pump Body: Clear liquid fertilizer selection stainless steel magnetic pump (no leakage, high precision), viscous fertilizer selection stainless steel gear pump / rotor pump (large suction capacity, anti-blocking), refuse ordinary plastic pumps;

Control System: Select PLC touch screen control (simple operation, adjustable filling volume and speed, supports one-click start/stop), refuse pure mechanical control (difficult adjustment, low precision);

Anti-bubbling / Anti-dripping: The filling head is equipped with an anti-dripping nozzle and a lifting-type filling (the filling head is inserted into the bottle for filling, reducing bubbling), suitable for water fertilizers that tend to bubble (such as liquid fertilizers containing surfactants);

Auxiliary Devices: Select the required batching bucket mixing device (to prevent suspended fertilizer particles from settling), heating device (suitable for high-viscosity fertilizers, heating reduces viscosity and makes filling easier), anti-corrosion conveying chain (for workshop use, avoiding rust).

4. Filling Accuracy & Production Capacity:

Filling Accuracy: The filling accuracy requirement in the agricultural materials industry is within ±1% (inclusive). For small bottles (such as 500ml/1L), the accuracy must be ≥ ±0.5ml, and for large barrels (20L/50L), it must be ≥ ±2g;

Production Capacity: Choose based on your own production scale. Small factories should select semi-automatic (manual bottle loading / capping), while large factories should select fully automatic (bottle sorting - filling - capping - labeling and other packaging production lines).

5. Clarify Details

Qualifications: CE certification (for export), equipment inspection, provide brand certificates for core components (pump body, flowmeter);

Contract: Specify material (304/316 stainless steel marked), core configuration brand, filling accuracy, warranty period, installation and commissioning time, training, and after-sales response time. Provide export services.

(II) Usage & Daily Maintenance Precautions (To extend equipment lifespan and ensure stable production)

Before startup: Before each startup, check if the seals are leaking, if the filling head is clogged, and if there are impurities in the bucket. Ensure that the pump body and flow meter are operating normally without abnormal noises;

Material filtration: Install a stainless steel filter screen (80-100 mesh) at the inlet of the bucket to filter out large particles of impurities in the fertilizer to prevent clogging of the filling head and pump body. The filter screen needs to be cleaned daily;

Avoid idling: The pump body must not idle without water or material. Otherwise, it will burn out the seals and the pump body. Before stopping, close the feed valve first and empty the fertilizer in the pipeline;

Daily cleaning: After each production session, rinse all components in contact with the fertilizer (filling head, bucket, pipeline) with clean water. If filling high-corrosive water fertilizer, use weak alkaline water for cleaning and then rinse with clean water to avoid residual fertilizer corrosion of the equipment;

Regular maintenance: Add lubricating oil to the bearings, gears, and conveying chain of the equipment monthly (food-grade / corrosion-resistant lubricating oil). Check the seals and flow meters every 3 months. Replace them in time if they are aging or worn;

Workshop environment: Maintain a dry and ventilated workshop to prevent the equipment from rusting due to long-term exposure to damp conditions. Do not stack strong acid / strong alkali materials around the equipment to prevent splashing and corrosion of the material;

Operator training: Require the manufacturer to provide professional training to operators, including equipment operation, simple fault troubleshooting (such as leakage, handling methods for inaccurate filling accuracy), and daily maintenance to avoid equipment failures caused by improper operation.

For more detailed information, you can directly contact the manufacturer of the liquid fertilizer filling machine: http://www.fillingsealingmachine.com Address: NO 43 HaiYong Road, Shiji town, PanYun, Guangzhuo China

Tel: 008613794308529   Wechat / Whatsapp Email:   chinamachine6@gmail.com