25t Agri-Bulk Grain Gantry Cranes: Sealed Bucket Unloaders for Port Grain Terminals
Traditional bulk grain loading and unloading equipment has high dust, high grain loss, and high operation and maintenance costs, and cannot be adapted to the green, efficient, and compliant operating requirements of modern grain terminals.The 25-ton bulk grain gantry crane is equipped with a sealed hopper system.
It is suitable for bulk grain loading and unloading scenarios such as wheat, corn, soybeans, etc., relying on the advantages of sealing and dust suppression, intelligent control, and strong adaptability, it is the preferred equipment for grain terminal upgrades.This article explains its structure, advantages, selection and operation and maintenance specifications in detail, and provides a reference for the selection and standardized operation of port equipment.
What Is a 25t Agri-Bulk Grain Gantry Crane
The 25-ton agricultural bulk grain gantry crane is a heavy-duty rail loading and unloading equipment built for port grain terminals, grain and oil storage and grain logistics hubs. It mainly completes the loading and unloading of bulk grain ships, transshipment and warehousing.The whole machine consists of four modules: gantry, lifting trolley, walking mechanism, and electronic control system. It is equipped with a sealed hopper reclaiming system and is suitable for bulk grain operations such as wheat, corn, and soybeans. It is the main equipment of large and medium-sized grain ports.
Compared with ordinary door machines, this machine abandons traditional hooks and is equipped with closed/semi‑closed sealed hoppers to lock bulk grain throughout the transfer process to reduce dust spills and material spills; the electric-hydraulic system can accurately control the displacement and lift, support mechanization and automation of high-frequency operations, and meet the needs of large-throughput bulk grain loading and unloading in ports.
The standard operating procedures of the equipment form a closed loop, which is also the core working logic of bulk grain loading and unloading in the port.：
- Precise alignment: The gantry crane travels smoothly along the dedicated track, accurately docks to the operating area of the ship's cargo hold, and completes the calibration and positioning of the operating point, with no offset and no blind spots.；
- Sealed reclaiming: The sealed hopper is smoothly lowered into the interior of the grain stack in the cargo hold, and the bulk grain material is captured in sufficient quantity through a precision closed structure. After it is closed, a fully sealed state is formed to lock the dust and material from the source.；
- Smooth lifting: The equipment adopts a controllable acceleration lifting mode to smoothly lift the fully loaded hopper, which effectively reduces material shaking, grain scattering and dust lifting, and ensures the stability and safety of the lifting process.；
- Precise transfer: the lifting trolley and the gantry work together to translate smoothly, and the sealed bulk grain materials are accurately transported to the terminal hopper and directly above the conveying equipment, and the whole process is stable without spilling.；
- Fixed-point unloading: the hopper is opened accurately at the designated station, and the bulk grain falls into the back-end conveying system at a uniform speed, completing the efficient transfer of materials and eliminating material waste and site pollution.；
- Circular operation: After the unloading is completed, the empty hopper quickly returns to reset, returns to the ship's cargo hold to carry out a new round of reclaiming operations, and runs in a closed loop back and forth until the whole ship's bulk grain unloading operations are all completed.
Core advantage
In the field of port bulk grain loading and unloading equipment, the 25-ton rated load is recognized by the industry as the gold standard for small and medium-sized grain terminals. The core advantages are concentrated in the three dimensions of working condition adaptation, safety redundancy, and investment cost performance, accurately matching the actual needs of mainstream bulk grain operation scenarios.
Advantages of adapting to working conditions
The operating parameters of the 25-ton bulk grain gantry crane are highly adapted to the loading and unloading conditions of mainstream bulk grain such as wheat, corn, and soybeans, and are perfectly adapted to the operating scale of most small and medium-sized grain and oil terminals, storage bases, and import and export logistics hubs.
The equipment can be flexibly adapted to different tonnage grain ships, standard terminal hoppers, conveying lines and silo storage systems. It has strong compatibility and can cover the whole process of conventional bulk grain loading and unloading, transshipment, warehousing, cross-modal transit and other operations in all directions. The versatility far exceeds that of special equipment for small tonnage.
Safety redundancy advantage
Sufficient safety margin is reserved for the rated load of the equipment, and the operating stability is extremely high.Taking wheat (bulk density of about 780kg/m3) as an example, the industry standard is equipped with a special sealed hopper of 2-3m3, and the weight of a single full load of grain is only 1.5-2.5 tons, which is much lower than the rated lifting weight of 25 tons.
Sufficient load margin can easily offset additional loads such as hopper weight, wind load, dynamic start-stop impact, etc., and avoid safety hazards such as overload, fuselage shaking, and material spilling throughout the process, and adapt to the high-frequency and continuous heavy-duty operation mode of the port.
Cost-effective advantage
The 25-ton model achieves the optimal balance between equipment investment and operating efficiency, and accurately adapts to the budget and production capacity requirements of the mid-range grain terminal.Compared with 50-ton and 100-ton large-scale ship unloading equipment, its procurement, infrastructure and operation and maintenance costs are lower, easy to deploy, and the threshold for landing is small.；
Compared with 10-ton and 16-ton small-tonnage equipment, the machine's operating efficiency, load stability, and operating coverage are all-round advantages. It can effectively improve the throughput of the terminal and avoid the problems of insufficient production capacity and frequent start-up and stop of small equipment. It is a cost-effective choice for small and medium-sized grain and oil terminals and private grain storage bases.
Mainstream application scenarios
With its high adaptability, high flexibility and high stability, the 25-ton agricultural bulk grain gantry crane is widely used in various bulk grain processing scenarios, covering the whole chain of grain import and export, warehousing and transshipment.：
- Port grain terminal: Focus on specialized loading and unloading operations of bulk grain ships, and efficiently complete the material transfer between ships and shore-based equipment. It is the core main loading and unloading equipment of grain ports.
- Grain and oil import and export park: suitable for cross-border grain and oil bulk loading, unloading, transit and transshipment operation scenarios, can meet the needs of foreign trade grain standardization, high frequency, and large throughput operations.
- Agricultural bulk grain yard: The whole process of bulk grain stacking, on-site transshipment, loading and warehousing can be mechanized in one stop, effectively improving the efficiency of warehouse turnover and the level of standardization of operations in the yard.
- Professional ship unloading station: accurately adapt to the centralized unloading conditions of bulk grain ships, greatly shorten the length of time for ships to dock in the port, and significantly improve the utilization rate of dock berths and overall operating efficiency.
- Grain silo transit base: it can be seamlessly connected with conveyors, hoists, and silo storage systems to realize the automation of the whole process of bulk grain transfer, transportation, and warehousing, and adapt to the needs of large-scale warehousing and transit.
- Public railway-water multimodal transport hub: adapt to multi-scenario and multi-modal transport conditions, efficiently complete the bulk grain transit connection between waterways, railways, and roads, and ensure efficient and smooth logistics links.
How Sealed Bucket Unloaders Improve Bulk Grain Handling
The 25-ton agricultural bulk grain gantry crane is a special orbital loading and unloading equipment for grain terminals, warehousing and multimodal transport hubs. It is suitable for unloading, transshipment and warehousing of bulk grains such as wheat, corn and soybeans.The equipment consists of four core structures: a gantry, a lifting trolley, a walking mechanism, and an electronic control system. It is equipped with a special sealed hopper to adapt to various bulk grain operation scenarios.
The machine abandons the traditional hook structure and adopts a fully/semi-enclosed sealed hopper, which operates in a closed manner throughout the process, effectively controlling dust and preventing material from spilling.Relying on the electro-hydraulic collaborative system to achieve accurate start-stop translation, the degree of automation is high, which can meet the needs of high-frequency and large-capacity loading and unloading operations in grain ports.
Precise control
There are two major industry pain points of dust pollution and grain spilling and loss in bulk grain loading and unloading operations in grain ports, which not only increase the cost of operation and maintenance and cause waste of food resources, but also easily cause environmental protection problems and endanger the occupational health of operators.The 25-ton bulk grain gantry crane is equipped with an exclusive sealed hopper system to solve various disadvantages in a targeted manner from the source of the operation. The core values are reflected in three dimensions.：
Operating environment
The sealed hopper adopts a closed structure design, which firmly locks the fine grain dust and powder materials in the closed loop of grain grabbing, full load lifting, horizontal transfer, and fixed-point unloading operations, and eliminates the dust-raising problem of open grab operations from the source.
At the same time, it can be used with the terminal's windproof hopper and dust collection equipment to work together to effectively resist the spread of dust caused by wind, greatly reduce the dust concentration in the operating area, and completely improve the dirty operating environment of the terminal.
Strictly control material spilling
Compared with the disadvantages of traditional grab gaps leaking materials and transportation spills, sealed hoppers rely on high-precision bite structure and flexible sealing accessories to achieve leak-free operation throughout the process.Effectively avoid the material loss of bulk grain in the transit process, minimize grain loss, greatly improve the utilization rate of bulk grain, reduce material loss costs for port enterprises, and achieve quality and efficiency improvement.
Adapt to environmental standards
The complete set of sealed unloading system fully conforms to the port's environmental protection control and occupational safety protection regulations, effectively solves the problem of excessive dust in bulk grain loading and unloading, and avoids the risk of environmental penalties.A clean and low-dust operating environment can not only protect the occupational health of operators, but also help grain terminals build a green, standardized and compliant bulk grain operating system, which is suitable for the green development requirements of modern ports.
Controllable precise unloading
The sealed hopper is equipped with a hydraulic and electric dual-mode precision opening and closing mechanism, with fast response speed and high control accuracy. The operator can accurately control the timing and opening and closing amplitude of the hopper through the control system, and only complete the unloading operation directly above the receiving hopper and conveyor.
The hopper is precisely adapted to the terminal receiving equipment, which can realize the fixed-point unloading of grain and prevent material spilling and offset.It not only reduces the loss of grain and the amount of cleaning work, but also stabilizes the pace of transportation, and adapts to the large-scale and standardized efficient operation mode of the port.
Key Components of a 25t Grain Gantry Crane
Heavy-duty door-type main structure
The main body of the equipment adopts box-shaped double-beam welded steel structure, and high-strength industrial steel is selected. The overall structure is stable, the bearing capacity is strong, and the fatigue resistance is excellent.The complete set of door frame consists of the main steel beam, support legs, end beam, lower beam, walking platform, guardrail, access ladder, operation room and other accessories. The structure is reasonably laid out and the working space is sufficient to facilitate transportation, installation and daily maintenance.
In view of the high-frequency cycle operation conditions of the port, the main structure has been optimized by professional mechanics to withstand tens of thousands of repeated heavy loads, effectively resist the structural fatigue caused by sea breeze, vibration, and dynamic loads, and adapt to the long-term heavy-duty operation needs of outdoor ports to ensure the long-term stable operation of equipment.
Lifting mechanism
The lifting mechanism is the power core of the equipment, which directly determines the efficiency and safety of bulk grain loading and unloading. The core configuration includes a lifting motor, a deceleration gearbox, a wire rope reel, a braking system, and an overload protection device.The whole system has plenty of power and stable operation, and can achieve precise lifting and speed regulation.
The equipment is specially optimized for bulk grain operations, with low-speed and stable movement in the hopper compartment, dust suppression and anti-spreading, and air transportation to speed up and increase efficiency.With multiple braking and overload protection, it can lock the load in real time, automatically alarm and power off if it exceeds the standard, and build a strong lifting safety line of defense from the hardware level.
Sealed hopper for grain
As an exclusive operating accessory, the sealed hopper is customized according to the characteristics of grain materials, and its core advantages are outstanding: it matches the exclusive volume according to the bulk density of grain and the throughput of the operation; the inner wall is equipped with wear-resistant steel plates to resist grain friction, fine sand and gravel wear, and extend the service life.；
The occlusal part is equipped with high-elastic sealing tape to achieve full-dimensional dust-proof and leak-proof; it is equipped with a hydraulic/electric intelligent opening and closing mechanism, which has stable operation and low failure rate, and is suitable for long-term high-frequency operations.
The whole machine walking operation system
The equipment walking mechanism consists of an end beam, a load-bearing walking wheel, a dedicated port track, and a frequency conversion drive system (VFD), which is the key to ensure the precise alignment and smooth operation of the equipment.
The walking speed range of the equipment is 60-110m/min. With frequency conversion speed regulation technology, it can achieve smooth start-stop and stepless speed regulation, completely eliminate the shaking of the fuselage caused by starting and braking, and greatly improve the alignment accuracy. At the same time, reduce the wear of wheels and tracks, and reduce operation and maintenance costs.
The special heavy-duty track is adapted to the outdoor paving environment of the port, with strong bearing capacity and high stability, which can ensure the long-term smooth operation of the whole machine and cover a wide range of terminal operating areas.
Electrical intelligent control system
The equipment is equipped with a PLC intelligent control system, which supports multiple operating modes of cab, wired handle, and wireless remote, and is suitable for various operating scenarios.It has functions such as operation monitoring, fault alarm, emergency shutdown, and data recording, and can be connected to terminal automated transportation and storage equipment to realize the whole process of bulk grain loading, unloading, transshipment, and warehousing.
The electrical system adopts a special design for dustproof, moisture-proof and anti-corrosion, which is suitable for the high humidity, dust and salt spray environment of the port, and the redundant design of the control system greatly reduces the probability of electrical failure and guarantees the stable operation of the equipment around the clock.
Advantages of 25t Gantry Cranes for Port Grain Terminals
High work efficiency
The operation cycle of the equipment is stable and the rhythm is compact. With a customized sealed hopper, the single reclaiming volume is large and the cycle time is short, which can achieve high-frequency continuous operation.Compared with traditional loading and unloading equipment, it greatly improves the hourly throughput of bulk grain, effectively reduces the demurrage fee of ships in the port, improves the utilization rate of terminal berths, and adapts to the needs of large-scale grain import and export operations.
Green
Relying on the closed operation design of the sealed hopper, the problems of dust and material loss in bulk grain loading and unloading are solved from the source.The low dust concentration and very little material spilling in the operating area not only improve the operating environment of the terminal, reduce the cost of clean operation and maintenance, but also fully meet the environmental protection and compliance requirements of the port. It is the core standard equipment of the green grain terminal.
Flexible layout
The orbital gantry structure covers a wide range and can operate back and forth along the long-distance track of the terminal. A single equipment can cover multiple cargo compartments and multiple receiving points, which are suitable for different terminal layout and different storage and transshipment configurations.The equipment does not need to occupy a large area of the ground space of the terminal, optimize the layout of the site, and adapt to the renovation and new construction projects of the old and new grain terminals.
Strong outdoor weather resistance
In view of the harsh working conditions of high humidity, salt spray, high winds and rainy weather in coastal ports, the equipment adopts a full set of anti-corrosion, waterproof and dustproof designs.The main steel structure is equipped with a multi-layer anticorrosive coating, the electrical components are sealed with a high protection level, and are equipped with windproof anchoring and track clamping devices, which can withstand high winds, heavy rains, and salt spray corrosion. Stable outdoor operations all year round, and longer service life.
Multiple security protections
The equipment is equipped with a full set of intelligent safety protection systems, including travel limit switch, overload protection, emergency braking, anti-collision system, real-time load monitoring, fault alarm and other functions, to avoid safety hazards such as lifting overload, travel overrun, equipment collision, and sudden failure in all directions, to ensure the safety of personnel, equipment, and cargo, and to adapt to high-intensity and high-load operation scenarios in ports.
How to Select the Right 25t Grain Gantry Crane
Clear job throughput
Hourly operating throughput of equipment = weight of material in a single bucket × number of operating cycles per hour.The selection needs to be combined with the average daily and monthly grain operation volume of the terminal to match the adapted hopper volume and equipment operating speed, so as to avoid insufficient production capacity caused by too small selection and waste of resources caused by too large selection. At the same time, it matches the frequency of ships' port operations to ensure that the operating efficiency matches the production capacity.
Analyze the characteristics of grain materials
The bulk density, fluidity, dust volume, and wear resistance of different grains vary greatly, which directly affects the hopper selection and equipment parameter configuration: the bulk density of wheat, corn, and soybeans is different, and the corresponding hopper volume needs to be matched; high-moisture grains are easy to clump, and the unloading structure needs to be optimized; grain categories with large dust volume need to strengthen the sealing configuration of the hopper; grains containing fine impurities need to strengthen the wear-resistant protection of the hopper.
Accounting for span and lifting height
According to the width of the pier trestle, the maximum width of the operating ship, the height of the cargo hold, and the installation location of the receiving hopper, the span and lifting height of the equipment are accurately calculated, and sufficient safe operating margin is reserved to ensure that the equipment can cover the entire operating area, there are no operating blind spots, and it is suitable for all kinds of conventional grain ship operations.
Match the working level of the equipment
The working level directly determines the service life and heavy-duty capacity of the equipment: for high-frequency large grain terminals that operate continuously in two or three shifts a day, the high-frequency A5 and A6 working levels need to be selected; for seasonal operations and low-frequency grain depots, the A4 level can be selected to meet the needs, and the precise selection can balance the cost and service life of the equipment.
Adapt to the outdoor environmental conditions of the port
Coastal ports need to focus on factors such as salt spray corrosion, high winds, high humidity, and temperature difference changes, and customize anticorrosive coatings, stainless steel fittings, high-protection electrical systems, and windproof safety devices; inland grain terminals can simplify anticorrosive configuration, focus on wear-resistant and dust-proof design, and fit actual working conditions to avoid over-configuration or under-configuration.
Safety and Environmental Considerations
Mechanical safety protection
The equipment is equipped with a full set of mechanical safety devices, and the overload protection system can monitor the load in real time and automatically stop and alarm if it exceeds the standard; the travel limit switches in all directions prevent over-range operations; the lifting and walking mechanisms are equipped with reliable braking systems, which can be quickly locked in emergency situations; the whole machine is equipped with an emergency shutdown button, which can be powered off and stopped with one key in case of sudden failure, avoiding the risks of mechanical operations in all directions.
Electrical safety protection
All electrical equipment adopts dust-proof, moisture-proof, and waterproof sealing design, which is suitable for the dusty and high-humidity environment of the port; the equipment is equipped with a perfect grounding system to eliminate the hidden dangers of static electricity in the dust environment; the motor is equipped with overheating protection, short circuit protection, and redundant design of key components of the control system to avoid safety accidents caused by electrical failures.
Special treatment of grain dust
With the dust control at the source of the sealed hopper as the core, it is equipped with the terminal pulse bag dust removal equipment, the dust-proof enclosure of the receiving hopper, and the closed design of the conveyor to form a complete dust control system.Regularly clean up the dust on the surface of the equipment to eliminate the hidden dangers of dust accumulation, not only to meet the requirements of environmental protection, but also to avoid the risk of grain dust explosion, and to ensure the safety and compliance of operations.
Special protection against corrosion and rust
In view of the corrosive environment of coastal ports, the main body of the equipment adopts the multi-layer anticorrosive process of sandblasting and rust removal + zinc-rich primer + intermediate paint + topcoat, and the exposed bolts and accessories are made of galvanized and stainless steel; the paint surface is regularly checked for integrity, and the wear and tear and shedding coatings are repaired in time to prevent the corrosion and aging of steel structures and extend the service life of the equipment.
Conclusion
The 25-ton agricultural bulk grain gantry crane is equipped with a sealed hopper unloading system, which is suitable for small and medium-sized and medium-sized grain terminals, grain and oil storage bases, and multimodal grain logistics hubs. It can take into account operational efficiency, equipment investment and safety margin. At the same time, it can improve the dust, spilling and material loss problems in traditional bulk grain loading and unloading.
The equipment adopts a sturdy steel structure, a precise control system and an outdoor weather-resistant design, and is equipped with multiple safety protections. The operation is stable, continuous and environmentally friendly.The whole machine supports the customization of working conditions of lifting weight, span, hopper and other parameters, which can improve quality and efficiency, reduce costs and consumption, and help the standardization and green operation of grain ports.
Henan Mine Crane can provide customized design and manufacturing solutions for 25-ton bulk grain gantry cranes and sealed hopper unloading systems according to the material characteristics, operating procedures and on-site working conditions of grain terminals.
