In the entire process of coal mine bulk material conveying, the stockpiling link is a key node connecting mining, processing, and outward transportation. However, it has long been restricted by three scenario-specific pain points: Raw coal (with a moisture content of 18%-25%) at coal mine shafts is prone to adhering to equipment, causing stockpiling blockages, and traditional stackers require frequent shutdowns for cleaning; Clean coal (with a particle size of 0.3-5mm) in coal washing plants exhibits a "top powder, bottom lumps" phenomenon due to stockpiling segregation, requiring secondary screening during subsequent outward transportation and increasing additional costs; The soft ground in gangue stockpiling areas makes it difficult for fixed stackers to move, resulting in a site utilization rate of less than 30%. As a professional manufacturer with 22 years of experience in the bulk material conveying field, Zoomry Heavy Industry takes the ZR-SF series radial stackers as the core, matching them with anti-adhesion belt conveyors, gangue-specific truck unloaders, and independently developed components such as high-sealing idlers and wear-resistant chute liners. It creates customized solutions featuring "scenario adaptation + intelligent control + wear resistance and durability" for coal mine bulk material stockpiling, fundamentally solving the stockpiling problems of different coal types and helping coal mines improve turnover efficiency and reduce operational losses.

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Scenario Advantages of Zoomry ZR-SF Radial Stackers in Coal Mines

Compared with universal stackers in the industry, the Zoomry ZR-SF series radial stackers have undergone targeted upgrades in aspects such as "material adaptation, space utilization, and environmental resistance":

• Precise Material Adaptation: Customized functional modules are developed based on the different characteristics of raw coal, clean coal, and gangue — During raw coal stockpiling, the stacker hopper is equipped with a built-in high-frequency vibration device (vibration frequency of 50Hz), which, combined with PTFE anti-adhesion liners, can reduce the raw coal adhesion rate from 12% (of traditional equipment) to below 1.5%; During clean coal stockpiling, a "uniform material distributor" is installed at the discharge port, and the clean coal is evenly dispersed onto the stockpile through 3 sets of guide plates, controlling the segregation rate within 2% without the need for secondary treatment; During gangue stockpiling, the boom is made of reinforced manganese steel, with a load-bearing capacity 25% higher than that of conventional models, capable of withstanding the high impact load of gangue (density of 3.2t/m³);
• Flexible Space Application: Breaking the site limitations of traditional fixed stackers, the ZR-SF radial stackers have three flexible adjustment functions — The radial rotation angle can be steplessly adjusted by 360°, covering a circular stockpiling area around the center point; The boom telescopic length can be customized from 5m to 20m, adapting to stockyards of different sizes; The luffing angle can be adjusted from -12° to +28°, enabling real-time adjustment of the material distribution position according to the stockpile height. Taking a coal mine with an annual output of 1.2 million tons as an example, after adopting the ZR-SF radial stackers, the stockyard space utilization rate has increased from 45% (traditional) to 78%, meeting the demand for increased production capacity without expansion;
• Strong Environmental Adaptability: In response to the dusty, humid, and highly corrosive operating environment of coal mines, special protection has been applied to the core components of the equipment — Independently produced idlers adopt a "double-sealing + waterproof bearing" design, with a protection rating of IP66. The water ingress in the 72-hour immersion test is ≤ 80g (better than China's GB standard of 150g), increasing dust protection capacity by 50% and achieving a service life of over 50,000 hours; The roller surface is sprayed with a ceramic wear-resistant coating (thickness of 0.8mm), making its anti-corrosion and wear-resistant performance 3 times higher than that of ordinary rollers; The machine frame undergoes double-layer treatment of hot-dip galvanizing + anti-corrosion topcoat, extending the anti-rust period to 8 years in the humid coal mine environment and reducing the annual maintenance frequency from 10 times (traditional) to 3 times.

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Solutions for Different Scenarios of Coal Mine Bulk Material Conveying

Centering on scenarios such as "temporary shaft stockpiling, clean coal storage in coal washing plants, and centralized gangue disposal" in the coal mine production process, and combining the material characteristics and operational needs of each scenario, Zoomry Heavy Industry takes radial stackers as the core to ensure seamless connection between the stockpiling link and the coal mine production rhythm:

Temporary Anti-Adhesion Stockpiling Solution for Raw Coal

Coal mine shafts need to temporarily stockpile raw coal mined underground before transferring it to coal washing plants or outward transportation stations. They must meet the requirements of "high-moisture raw coal anti-adhesion + rapid turnover" to avoid raw coal backlog at the shaft affecting underground mining. The solution centers on "short-distance anti-adhesion belt conveyors + ZR-SF radial stackers":

• Equipment Configuration: Short-distance anti-adhesion belt conveyors (belt width of 1200-1600mm, conveying speed of 2.0-2.5m/s) are selected, with the Conveyor Belt surface treated with "diamond-shaped anti-slip + anti-adhesion coating" to reduce raw coal adhesion; The head of the conveyor is seamlessly connected to the feed hopper of the ZR-SF radial stacker. The stacker automatically adjusts the boom rotation speed (0.3-1.2m/min) according to the raw coal output at the shaft, realizing synchronous "continuous conveying - dynamic stockpiling";
• Key Accessories: A dual anti-blocking device of "scraper + vibrator" is installed at the bottom of the stacker hopper. When raw coal adheres to the inner wall of the hopper, the scraper cleans it in real time, and the vibrator assists in material discharging to avoid blockages; In response to the dusty environment at the shaft, the stacker operation room is equipped with a positive-pressure dust removal system to ensure clear visibility for operators. At the same time, the remote control system supports monitoring of the stockpiling status in the underground dispatch room, reducing the number of on-site operators at the shaft;
• Solution Effects: Compared with traditional equipment, the raw coal stockpiling blockage rate has decreased from 15% to 0.8%, the monthly equipment downtime is controlled within 1.2 hours, and the raw coal turnover efficiency at the shaft has increased by 40%, completely resolving the contradiction of "fast underground mining but slow shaft stockpiling".

Homogeneous Anti-Dust Stockpiling Solution for Clean Coal

Clean coal in coal washing plants needs to be stored for a long time before outward transportation, requiring guaranteed coal quality homogeneity (to avoid segregation) and environmental compliance (to control dust). Traditional stackers cause clean coal to require secondary screening before outward transportation due to uneven material distribution, increasing processing costs by 15%. The solution centers on "pipe belt conveyors + ZR-SF radial stackers + dust collection hoods":

• Equipment Configuration: Pipe belt conveyors (belt width of 1000-1400mm, conveying capacity of 500-800tph) are used to transfer clean coal from the washing workshop to the stockpiling area. The conveyor belt is folded into a tubular structure to achieve 100% sealed conveying, avoiding dust diffusion during transportation; The ZR-SF radial stacker is equipped with a "uniform material boom", which precisely controls the material distribution angle through a PLC control system to ensure even coverage of the stockpile with clean coal. At the same time, a telescopic dust collection hood (coverage radius of 8-12m) is installed on the top of the stacker, controlling the dust concentration during stockpiling below 3mg/m³ and complying with EU environmental standards;
• Key Accessories: A "buffer chute" is installed at the end of the stacker boom, reducing the falling speed of clean coal from 2.8m/s (traditional) to 0.9m/s, minimizing clean coal breakage loss and ensuring coal quality integrity; A "spray moisturizing system" (which can start and stop automatically according to humidity) is installed around the stockpile to prevent clean coal dust from flying in dry weather, while controlling the clean coal moisture content stably within 12%-15% without affecting subsequent combustion or processing;
• Solution Effects: Compared with traditional equipment, the clean coal segregation rate has decreased from 8% to 1.5%, enabling direct outward transportation without secondary screening, saving approximately 1.2 million RMB in annual screening costs. At the same time, dust emissions meet standards, passing the annual inspection of local environmental protection departments.

Efficient Disposal and Stockpiling Solution for Soft Ground in Coal Mine Gangue Areas

Gangue generated during coal mine production (accounting for 15%-20% of raw coal output) needs to be centrally stockpiled and disposed of. Most gangue stockpiling areas have soft ground, making it difficult for traditional fixed stackers to move, resulting in low site utilization rates. Moreover, the high hardness of gangue is prone to causing equipment wear. The solution centers on "tracked truck unloaders + ZR-SF tracked radial stackers":

• Equipment Configuration: ZRLD-TU series tracked truck unloaders (belt width of 1400-1800mm, conveying capacity of 600-1500tph) are used to receive gangue from transfer trucks. The tracked chassis can travel stably on soft ground without the need for paved hard roads; Gangue is transferred to ZR-SF tracked radial stackers (equipped with 4 sets of extra-solid tracks, with a ground pressure of ≤ 0.08MPa) via short-distance wear-resistant belt conveyors. The stackers can move freely in the gangue stockpiling area and adjust the stockpiling position according to site conditions;
• Key Accessories: The inner wall of the stacker chute is lined with 20mm-thick wear-resistant alloy liners (material: NM450) to resist gangue impact wear, extending the service life to over 10 years; The boom adopts a "lattice + reinforcing rib" structure, ensuring load-bearing capacity while reducing weight, lowering the tracked travel load, and reducing energy consumption by 20% compared with traditional tracked stackers;
• Solution Effects: Compared with traditional equipment, the site utilization rate has increased from 30% to 65%, the gangue stockpiling efficiency has increased by 50%, the service life of the stacker's wear-resistant components has been extended by 4 times, and the annual maintenance cost has been reduced by 40%. At the same time, it avoids gangue occupying production sites, ensuring the smooth operation of the main coal mine production process.

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Value of Zoomry Heavy Industry's Coal Mine Radial Stacker Solutions

1. The anti-blocking and anti-segregation design of radial stackers reduces the raw coal loss rate from 5% to 0.9, saving 1-1.5 million RMB annually in clean coal secondary screening costs; The wear-resistant components extend the equipment service life, reducing maintenance costs by 35% compared with traditional equipment. Taking one ZR-SF radial stacker as an example, the annual maintenance cost can be saved by 800,000-1.2 million RMB;
2. The raw coal turnover efficiency at the shaft has increased by 40%, avoiding underground mining shutdowns; The clean coal stockpiling-outward transportation cycle in coal washing plants has been shortened from 72 hours (traditional) to 48 hours; The gangue stockpiling efficiency has increased by 50%, and the site utilization rate has doubled, eliminating the need for stockyard expansion. Taking a coal mine with an annual output of 1.5 million tons as an example, it can save approximately 8 million RMB in site expansion investment;
3. Before the project starts, Zoomry Heavy Industry will send a team composed of "mechanical engineers + coal mine process consultants" to conduct on-site surveys, obtain site data (slope, space size, material characteristics) of the coal mine shaft, coal washing plant, and gangue stockpiling area through drone scanning, and customize stacker parameters based on the coal mine's production capacity requirements — For example, customizing widened tracks for soft gangue sites and shortening the stacker rotation radius for narrow shaft spaces; At the same time, a "3D model of equipment layout" is provided to allow customers to predict the installation effect in advance and avoid subsequent adjustments;
4. After the equipment is put into operation, a "1+1" on-site service (1 dedicated on-site engineer + 1 remote technical support) is provided. The on-site engineer conducts a comprehensive equipment inspection once a month (focusing on boom stress, hydraulic system, and sealed idlers) and submits an "equipment health report" once a quarter; "Coal mine spare parts centers" have been established in major global coal-producing areas (such as New South Wales, Australia; South Africa, Africa; Inner Mongolia, China). Special spare parts for ZR-SF radial stackers (such as boom telescopic cylinders, wear-resistant liners, and sealed bearings) can be shipped within 24 hours, the emergency response time for sudden failures does not exceed 3 hours, and the repair time for a single failure is controlled within 2 hours;
5. In the later stage, Zoomry will provide training covering "scenario-based operations (such as raw coal anti-blocking techniques, clean coal homogenization methods), emergency fault handling (such as boom jamming unlocking, hydraulic system pressure relief treatment), and equipment life extension maintenance (such as idler seal replacement, roller coating touch-up)", ensuring that the coal mine operation team has independent operation and maintenance capabilities and reducing equipment losses caused by human operation errors.