Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    Shaanxi Province, Shenmu County, Heilonggou Coal Mine purchases MDP-type mine-used self-balancing multistage pump main drainage equipment.
    Shaanxi Province, Shenmu County, Heilonggou Coal Mine purchases MDP-type mine-used self-balancing multistage pump main drainage equipment.

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    Shaanxi Province, Shenmu County, Heilonggou Coal Mine purchases MDP-type mine-used self-balancing multistage pump main drainage equipment.

    The Heilonggou Coal Mine, after undergoing a safety assessment, was identified as a mine with risks of gas outbursts and potential coal dust explosion hazards. Consequently, stringent requirements have been set forth regarding the safety performance, explosion-proof ratings, and reliability of underground equipment. On August 26, 2014, Changsha Zhonglian Pump Industry Co., Ltd. successfully won the bid for the mine’s main drainage equipment procurement project, providing the mine with both the primary drainage units and their accompanying auxiliary machinery. Notably, the core underground drainage equipment selected for this project is the MDP-type mining self-balancing multistage centrifugal pump. This pump model employs a bottom-valve-free drainage system, which effectively simplifies the overall structure of the drainage system, reduces potential failure points, and enhances both drainage efficiency and operational stability. Below are the technical specifications and equipment details provided by Changsha Zhonglian Pump Industry specifically tailored for the mine’s main drainage system.

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    86-731-88192288

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    zbpumps@163.com

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    Project Introduction

    Shaanxi Province, Shenmu County's certain mining company is located approximately southwest of Shenmu County town. 44 The Heilonggou Coal Mine, located in the Da Baodang Town area spanning several kilometers, has been identified through safety assessments as a mine with a risk of gas outbursts and potential coal dust explosion hazards. Consequently, stringent requirements have been imposed on the safety performance, explosion-proof ratings, and reliability of underground equipment. 2014 Year 8 Month 26 In the project to procure the main drainage equipment for the mine, Changsha Zoomlion Pump Industry Co., Ltd. successfully won the bid, providing the mine with both the primary drainage system and its accompanying auxiliary machinery. Notably, the core underground drainage equipment selected was MDP A mine-use self-balancing multistage centrifugal pump—this pump model employs a bottom-valve-free drainage system, which effectively simplifies the structure of the drainage system, reduces potential failure points, and simultaneously enhances both drainage efficiency and operational stability. The following details are provided: Changsha Zhonglian Pump Industry Technical requirements for the pump equipment and project provided for the mine's main drainage system.

     

    Mining self-balancing multistage centrifugal pump

     

     

    I. Detailed Supply Configuration List for Pump Equipment:
     

    Serial Number Goods Name Model and Specifications Unit Quantity Note
    1 Water pump MD450-60×3 (P) Taiwan 3 Changsha Zoomlion Pump Industry Co., Ltd.
    2 Explosion-proof motor YB 3500-2 /455kW/10kV /IP54/F Taiwan 3 Nanyang Explosion-Proof Group Company
    3 LFSS Integrated Connector DN250, PN2.5 MPa Item 3 Changzhou Lanling Valve Control Co., Ltd.
    4 Mining-use electrically actuated hydraulic gate valve ZDYF—250, DN250, PN2.5 MPa Set 9 Explosion-Proof Type Zhuzhou Southern Valve Co., Ltd.
    5 Water distribution gate valve and operating mechanism PXWI-500, DN = 500 mm PN = 0.1 MPa Set 3 Short-Handle Valve – Changzhou Lanling Valve Control Co., Ltd.
    6 Air-water jet pump Explosion-proof automatic control type, ZPBZ-Ⅱ PN = 2.5 MPa Set 3 Shandong Boshan
    8 Micro-restriction Slow-Closing Check Valve
    HH44H-25
    DN250 PN2.5 MPa
    		Taiwan 3  
    9 Wedge-type gate valve Z41H-25 DN25 PN2.5MPa One 3
     

     

    II. Core Technical Requirements for Pumps and Motors

    (1) Centrifugal Multistage Pump Technical Parameters

    1. Spindle Material and Processing Technology: The pump spindle is made of stainless steel (marked d1 ), it undergoes tempering treatment before leaving the factory, ensuring that the shaft possesses excellent strength, toughness, and fatigue resistance, enabling it to withstand the demanding operational loads in complex downhole conditions over extended periods.

    2. Bearing selection criteria: The pump bearings are specifically specified to be imported Swedish-made. SKF Brand-name bearings—this type of bearing offers advantages such as high precision, low friction coefficient, excellent wear resistance, and extended service life, providing stable support for pump rotor components while minimizing operational vibration.

    3. Self-balancing structural design: The pump features a self-balancing mechanism, with the impeller and rotor components arranged symmetrically. During operation, the axial forces generated by the opposing impellers effectively cancel each other out, eliminating the need for additional auxiliary balancing components such as balance discs or balance drums. This significantly reduces equipment failure risks and simplifies maintenance procedures.

    4. Bearing Sealing Protection: The pump bearing sealing system utilizes "oil-resistant seals." + The combined design of the "water-blocking ring" effectively prevents moisture, coal dust, and other impurities from the underground damp environment from entering the bearing chamber, thereby avoiding issues such as bearing rusting and grease failure, and ensuring the long-term stable operation of the bearing.

    5. Operational Efficiency Characteristics: When the pump operates at its rated condition point, its efficiency can reach peak levels. At the same time, its efficient operating range features a "wide and smooth" profile, enabling it to adapt to fluctuations in mine water reservoir levels that cause changes in drainage load—thereby reducing energy waste caused by operational conditions drifting away from the high-efficiency zone.

    6. Dynamic and static balance requirements: All rotating components of the pump (such as impellers, rotor shafts, etc.) must undergo both static and dynamic balance tests before leaving the factory. The test accuracy must meet the latest current national standards (e.g., GB/T9239.1 ), and must not fall below the standards stipulated. G6.3 Level-precision requirements ensure no abnormal vibrations during operation.

    7. Pump Chamber Overpressure Test: After the sealing assembly of each pump chamber is completed, it must undergo an individual overpressure pressure resistance test (the test pressure typically equals the design pressure). 1.2–1.5 倍），using hold-pressure testing to verify whether the pump chamber's sealing performance and structural strength meet the high-pressure drainage requirements underground.

    8. Full-machine performance testing: After the water pump is fully assembled, it must be tested according to current national standards (e.g., GB/T12785 ) Conduct comprehensive performance tests, covering critical parameters such as flow rate, head, efficiency, vibration velocity, and operational noise. Only after all indicators meet the standards can the product be shipped from the factory.

    9. Lifetime warranty: The entire pump unit is designed according to "long-life" standards, and under the condition of regular maintenance and compliant operation, its effective service life will be no less than 20 This year, it can reduce the frequency of mine equipment replacements and lower long-term investment costs.

    10. Comprehensive performance advantages: The pump must feature an optimized, streamlined structural design, high operational efficiency, excellent anti-cavitation performance, superior precision in component manufacturing, smooth overall operation with minimal vibration and low noise levels. When operating within the efficient range, the pump exhibits lower shaft power consumption, effectively reducing both the daily energy usage and operational costs of the mine drainage system—demonstrating remarkable energy-saving characteristics.

    11. Weather and corrosion resistance: The entire pump unit must exhibit excellent anti-rust performance (indicated by a label). d2 )、Excellent wear resistance and acid resistance allow it to adapt to the complex, humid underground mine environment, which contains minor corrosive media such as sulfur-containing mine water, thereby preventing equipment from accelerated aging due to corrosion and wear.

    12. Temperature Monitoring Configuration: Embedded in the Pump Bearing Area Pt100 A platinum resistance temperature sensor, paired with a separate explosion-proof temperature measurement junction box, enables real-time monitoring of bearing operating temperature. If the temperature rises abnormally, it promptly issues an alert, preventing bearing damage caused by overheating.

     

     

    (II) Explosion-Proof Motor Technical Parameters

    1. Explosion-proof motor selection: The motors shall feature an explosion-proof design, and the recommended compatible brands are either Jiamusi Motor Co., Ltd. or qualified products manufactured by Nanyang Explosion-Proof Group Company. The explosion-proof rating must meet the requirements for underground coal mines. Exd "Class requirements to ensure safety when used in gas and coal dust environments."

    2. Bearing and Lubrication System: The motor bearings are imported from Sweden. SKF Brand-name rolling bearings use lithium-based grease with excellent high-temperature stability as the lubricant; additionally, they are equipped with a "non-stop oil filling and draining system," enabling grease replenishment and replacement while the motor remains fully operational—thus preventing disruptions to drainage caused by downtime for lubrication.

    3. Stator Winding Temperature Monitoring: Embedded Inside the Motor Stator Windings Pt100 A platinum resistance temperature sensor, paired with a dedicated explosion-proof temperature measurement junction box, enables real-time monitoring of winding temperature changes, helping to prevent insulation layer degradation and damage caused by overload or inadequate heat dissipation.

    4. Bearing Temperature Monitoring: Each motor bearing is individually equipped. 1 One Pt100 Platinum resistance temperature sensors of the type are used, with all sensor signals routed uniformly into independent explosion-proof temperature-measuring junction boxes, enabling individual monitoring of each bearing’s temperature and facilitating precise identification of overheating fault locations.

    5. Auxiliary Protection Configuration: The motor is equipped with a space heater, enabling it to start even during prolonged equipment downtime or in low-temperature downhole environments, thus preventing the stator windings from moisture-related insulation degradation. Additionally, an independent explosion-proof junction box is installed, ensuring robust explosion-proof sealing during wiring operations and effectively preventing the ingress of gas and coal dust into the junction chamber—thereby mitigating the risk of safety incidents.

     

    3. Pump Electrical Control System (sold separately)

    The operation of the water pumps is centrally controlled by a "Mine Water Pump Integrated Automatic Control System," whose core functions include:

    1. Real-time parameter monitoring: Utilizing sensors to continuously collect critical data such as water reservoir levels, drainage flow rates, motor operating temperatures (stator windings and bearings), and underground power loads, providing essential information for operational control.

    2. Automatic rotation operation: Based on changes in water tank levels and power load, the system automatically switches multiple pumps on and off, preventing excessive wear caused by prolonged operation of a single pump.

    3. Peak-shaving and valley-filling for energy conservation: Operating on the principle of "peak-shaving and valley-filling," the system prioritizes starting water pumps to drain water during periods of low underground grid load, while reducing the number of operating pumps during peak hours—thereby alleviating pressure on the grid and enhancing the overall energy efficiency of the mine.

    4. Automatic Emergency Response to Failures: When the pump experiences issues such as overload, bearing overheating, or motor failure, the system immediately activates the automatic alarm function. Based on the severity of the fault and the status of the backup pump, it automatically starts the backup pump, ensuring uninterrupted operation of the mine drainage system and safeguarding safe underground production.

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