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Perspektivnye Tekhnologii LLC (Перспективные технологии) visited MP’s facility in Quzhou, Zhejiang Province, China, on May 19, 2026. The company is a mining screening equipment manufacturer based in Kemerovo, Russia. They came for a factory acceptance test (FAT).The customer was founded in late 2018 and is headquartered in the strategic core area of the Kuznetsk Coal Basin. It has grown rapidly, reporting a net sales increase of over 80% year-on-year in 2024. Its core business includes the design and manufacturing of mining screens, vibrating screens, and classifying screens. The company is a regular exhibitor at regional mining events, including the Industrial Safety exhibition in Novokuznetsk. They place a strong emphasis on equipment safety and reliability. The visiting team included its Chief Engineer and Chief Beneficiation Engineer, and they came for the sole purpose of conducting the FAT.
MP Mining Equipment Corp., Ltd. brings years of design and manufacturing experience in the mining equipment industry. The company produces a range of heavy machinery, including rock crushers, feeders, and screens. MP maintains a complete quality management system that covers technical validation, component selection, final assembly, and commissioning. The equipment supplied to the customer is a double-deck flip-flow classifying screen, model 2CZS3685, with a total weight of 34 metric tons and a maximum processing capacity of 1,200 tons per hour. This screen will operate in an open-pit mine in Russia, where ambient temperatures range from -40°C in winter to +40°C in summer. This environment demands exceptional durability and reliability from the equipment.
The vibrating screen will operate in an open-pit mine in Siberia, where winters are long and harsh and temperatures can drop to -40°C. Conventional steel loses much of its toughness at such low temperatures and becomes prone to brittle fracture. Meanwhile, the customer is in a high-growth phase and faces significant production pressure. Any unplanned downtime would directly affect its delivery schedules and revenue.
This operational reality leads to two primary concerns:
First, whether the overall quality and workmanship meet the required standards.
Second, whether the equipment can operate reliably at -40°C.
If critical components — springs, the screen box structure, or welds — fail under extreme cold, the entire production line would stop. Therefore, this inspection was not just about accepting a single piece of equipment. It was also about evaluating whether a supplier has the capability to support the customer’s production needs in one of the world’s harshest environments.These demanding requirements translate into highly specific technical specifications. They cover everything from screen box materials and weld safety factors to the low-temperature impact properties of springs and motor protection ratings. Below are the detailed equipment and technical requirements used for this acceptance test.
| Item | Description |
|---|---|
| Equipment Name | Double-deck flip-flow classifying screen |
| Model | 2CZS3685 (2YCZS3685 Flip-Flow vibrating screen) |
| Upper screen opening | 25 mm |
| Lower screen opening | 6 mm |
The equipment is used for product classification by size (0–6 mm and 6–25 mm), allowing the customer to separate and sell different particle sizes for different applications.
| Parameter | Value |
|---|---|
| Material to be screened | Coal concentrate, run-of-mine coal |
| Bulk density | 0.8 – 1.2 t/m³ |
| Moisture content | 9% |
| Feed size | 0 – 300 mm |
| Product fractions | Fraction 1: 25 – 300 mm Fraction 2: 6 – 25 mm Fraction 3: 0 – 6 mm |
| Screening efficiency | ≥90% per deck |
| Overall dimensions (L×W×H) | 8,956 × 5,742 × 5,300 mm |
| Total weight | 34,000 kg |
| Processing capacity | 350 – 1,200 t/h |
| Motor power | 90 kW |
| Number of motors | 1 |
| Number of decks | 2 |
| Deck area | 30.6 m² |
| Screen surface size (L×W) | 3,600 × 8,500 mm |
| Working environment | Open-pit |
| Ambient temperature | -40°C to +40°C |
| Dust cover | Full length |
| Spring material | 60Si2MnA |
The screen box shall be manufactured from high-quality structural steel with comprehensive mechanical properties. This ensures reliable and durable operation under vibration loads and uneven material flow.
The screen box shall be coated with a wear-resistant layer.
Side plates shall be made from one-piece rolled metal plate with no welded joints.
The design of side plates, vibrating beams, and cross beams shall satisfy the requirements for sub-zero temperature operation. The safety factor shall be not less than 2.6.
The bottom deck screen panel shall be of a movable type. We achieve this using movable cross beams fixed to the side plates.
Screen panels shall use a quick-release installation structure.
We shall design and manufacture the screen in accordance with GB mechanical design standards, IEC standards, JB/T 9022-1999 (Vibrating screen design standard) , JB/T 5496-2004 (General requirements for vibrating screen production) , international standards, and the requirements of the Russian coal industry.
The screen structure shall allow all components to be replaced without welding.
| Parameter | Requirement |
|---|---|
| Supply voltage | 380 V |
| AC frequency | 50 Hz |
| Winding temperature sensor | Yes, Pt 1000 |
| Maximum power | 90 kW |
| Enclosure protection (GOST 14254-2015) | IP 55 |
| Energy efficiency class (IEC 60034-30) | IE3 |
| Stator winding insulation class | F |
We shall package the equipment with a metal frame, waterproof tarpaulin, and wooden case. The equipment shall receive moisture-proof treatment to ensure a storage life of at least 12 months without altering its original characteristics.
To address the customer’s stringent requirements for extreme cold-weather operation, MP Mining Equipment implemented a three-pronged approach.
We provided material certificates and incoming inspection records for all critical components — including the Q355E steel structure, the 42CrMo shaft, and the 60Si2MnA springs. We designed and manufactured these components in accordance with GB, IEC, JB/T, and Russian coal industry standards.
The customer was particularly concerned about the springs. For this reason, MP compared the performance of 60Si2MnA and 51CrV4 at -40°C. 60Si2MnA has a lower ductile-to-brittle transition temperature (approximately -50°C) and significantly higher impact toughness. We therefore selected 60Si2MnA for the springs. Regarding the side plates, the customer required one-piece rolled metal plates without welded joints. MP strictly followed the drawings during processing to avoid making welds a weak point at low temperatures.
60Si2MnA offers significantly better performance than 51CrV4 at -40°C. The primary reason is that 60Si2MnA has a lower ductile-to-brittle transition temperature. It maintains good resistance to brittle fracture at -40°C, whereas 51CrV4 loses more toughness and presents a higher brittleness risk at this temperature.
| Property | 60Si2MnA | 51CrV4 | Low-temperature suitability |
|---|---|---|---|
| Ductile-to-brittle transition temperature | Approx. -50°C | Approx. -20 to 0°C | 60Si2MnA is well below -40°C; 51CrV4 is already in the brittle range at -40°C |
| Charpy V-notch impact energy (KV) at -40°C | 28 – 38 J | 10 – 20 J | 60Si2MnA meets the safety threshold (≥27 J); 51CrV4 is well below |
| Yield strength (Rp0.2) | 1,100 – 1,300 MPa | 1,000 – 1,200 MPa | Both meet spring load requirements |
| Elastic limit | High and stable | High but prone to low-temperature failure | 60Si2MnA retains better elasticity at low temperature |
| Hardenability (thick sections) | Moderate; suitable for springs ≤50 mm in diameter | Good; suitable for springs ≤80 mm in diameter | If the spring section exceeds 50 mm, we must optimize hardenability for 60Si2MnA |
We set the screen box safety factor at not less than 2.6. The springs meet the anti-brittle fracture requirements at -40°C. We made all screen plates and cross beams fully removable, so maintenance requires no welding.
The motor achieves IE3 energy efficiency, IP55 enclosure protection, and Class F stator winding insulation. We installed a Pt1000 temperature sensor to monitor winding temperature in real time.
We validated the above solutions through the customer’s on-site inspection. The following section details the complete FAT process and key checkpoints.
They conducted the inspection in accordance with GB mechanical design standards, IEC standards, JB/T 9022-1999, JB/T 5496-2004, international standards, and the requirements of the Russian coal industry.
Detailed Inspection Items
Documentation review: They checked 11 items, including the certificate of conformance, instruction manual, drawings, material certificates, inspection records, spare parts list, and packing list. All items were complete.
Physical count: They verified the screen body, upper and lower screen panels, dust cover, and various spare parts (springs, bearings, shafts, etc.). All quantities and specifications were correct.
Appearance and workmanship: They visually inspected the welds and found no cracks or defects. They measured the frame dimensions, flatness, and coating thickness (≥80 μm), and all values met the requirements. The nameplate, surface finish, and screen panel condition were all acceptable.
Mechanical components: They confirmed that the vibrator was securely mounted, the shaft rotated smoothly, and lubrication was adequate. The screen panels were fixed without gaps. The vibration isolation springs showed no tilting. The guard covers were sealed, and the polyurethane coating was intact.
No-load run test: They ran the equipment continuously for more than 4 hours. The start-up was smooth, and the vibration direction was correct. The frame vibration did not exceed 80 Hz. The bearing temperature remained at or below 70°C. They heard no abnormal noise and observed no oil leakage.
Acceptance conclusion: The inspection revealed no issues and no major defects. The acceptance committee unanimously rated the equipment as PASS.
The entire FAT process lasted one full day. The customer team went through the checklist item by item — weld quality, frame dimensions, flatness of mounting surfaces, coating thickness, bolted connections, and screen panel defects — and verified everything. During the no-load run test, the equipment ran continuously for more than 4 hours. The start-up was smooth with no abnormal impact. Bearing temperatures remained below 70°C. There was no abnormal noise or oil leakage. The customer’s Chief Engineer and Chief Beneficiation Engineer monitored the entire process and concluded that the overall quality is satisfactory, the workmanship is solid, and the performance testing meets expectations.
After the successful FAT, we proceeded with the next steps. We plan to ship the equipment around June 2026. After shipment, MP Mining Equipment Corp., Ltd. will provide complete drawings, a spare parts list, and STEP-format 3D models. All external dimensions and connection dimensions will match the actual equipment, allowing the customer to proceed with process line design.After the equipment arrives at the customer’s site in Russia, MP will dispatch engineers to provide installation guidance and commissioning. MP engineers will arrive on-site within 10 days of receiving the customer’s notice. After the equipment enters service, we will provide an 18-month warranty period. We will continue to supply any spare parts the customer needs thereafter. What the customer receives is not just a screening machine, but a complete package of technical handover and on-site support from a trusted mining equipment manufacturer.
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