ZWY Series Coal Mine Excavator Loader Complete Machine Configuration Description

This configuration specification applies to the ZWY series tracked excavator loaders (mining loaders) for coal mines. The equipment strictly adheres to coal mine standards for explosion-proof, dust-proof, wear-resistant, and high-load operation. It is suitable for coal mine roadway excavation, slag removal, and material transfer. All core components are specifically adapted for the humid, dusty, high-load, and steep-slope operating environments underground. The overall structure is stable, the hydraulic transmission is efficient, and the electrical system is explosion-proof, meeting mining safety regulations and the requirements for continuous underground operation. The following are detailed configuration parameters and performance specifications for each core component of the machine:

1. Main Pump

The mining-specific high-pressure variable plunger main pump is used as the core power source of the hydraulic system of the whole machine, adapting to the full working conditions of the ZWY series models. The rated working pressure of the equipment can reach 25MPa, the peak pressure is 32MPa, and the flow output is stable. The flow can be automatically adjusted according to different operating conditions of excavation, transportation, and walking, reducing energy consumption and equipment heating. The pump body adopts a high-strength alloy shell with built-in precision wear-resistant oil distribution plate and plunger assembly. It has the characteristics of impact resistance, high pressure resistance and low noise. The overall sealing structure has been optimized for dustproofing and waterproofing, and can adapt to the humid and dusty underground environment, effectively avoiding hydraulic oil contamination, pressure relief, and leakage problems, ensuring the continuous and stable power output of the hydraulic system of the entire machine, long service life, low failure rate, and suitable for long-term continuous operation underground.

2. Walking Hydraulic Motor Assembly

The machine is equipped with a dual-drive hydraulic motor assembly, with independent drive for the left and right tracks. It utilizes low-speed, high-torque piston-type hydraulic motors and an integrated reduction mechanism, combining braking, deceleration, and drive functions. The hydraulic motors offer high starting torque and smooth start-up without jamming or slippage, making them suitable for muddy, gravelly, and uneven road surfaces in mines, while also meeting the requirements for climbing slopes of ≤32°. A built-in wet multi-disc brake structure automatically locks in case of power or oil failure, ensuring a safe and reliable parking brake and eliminating the risk of slippage on slopes. The hydraulic motor housing is made of thickened, wear-resistant alloy material, providing excellent sealing performance and resisting corrosion from underground dust and mud. The machine offers sensitive speed adjustment, precise steering and forward/backward control, and flexible operation in confined spaces. It boasts strong load-bearing capacity, impact resistance, and fatigue resistance, making it suitable for high-frequency start-stop operations.

3. Transport tank hydraulic motor

The dedicated hydraulic motor for the transportation system provides exclusive power to the scraper conveyor mechanism. Utilizing a fixed-displacement high-pressure hydraulic motor, it offers stable speed and sufficient torque, driving the scraper chain at a uniform speed. The conveying speed is adapted to the needs of ore and crushed stone material transfer, ensuring smooth conveying without blockage or deviation. The hydraulic motor is suitable for continuous underground material conveying conditions and features overload protection. It automatically releases pressure and buffers when material jams or overload occurs, effectively protecting the scraper chain and conveyor structure from damage. The overall structure is compact, with excellent dustproof sealing, wear resistance, and corrosion resistance, allowing it to withstand harsh working conditions such as material friction and dust intrusion for extended periods. Uniform power output ensures efficient, stable, and continuous feeding of the transport trough, significantly reducing the probability of conveyor mechanism failure.

4.Traveling Chain Track Assembly

The machine adopts a mining-grade reinforced tracked assembly, consisting of high-strength track plates, wear-resistant track pins, load-bearing wheels, guide wheels, track support rollers, tensioning mechanism, and a walking frame. The track plates are integrally cast from high-manganese steel, with increased thickness and deeper grooves, providing extremely strong grip with a ground pressure specific pressure ≤0.1MPa and a large ground contact area, making it less prone to getting stuck in muddy or soft roadways. All wheels undergo heat-treated wear resistance, ensuring flexible rotation and strong load-bearing capacity, capable of withstanding the impact load of the entire machine under full load. Equipped with a mechanical automatic tensioning mechanism, it can adjust track tension in real time, preventing track derailment and loosening, and reducing noise and wear. The overall structure is impact-resistant, tensile-resistant, and not easily deformed, suitable for complex underground road conditions, high-frequency movement, and uphill operations. It offers stable movement, a low failure rate, and durability far exceeding that of ordinary civilian tracked assemblies.

5. Oil cylinder

The whole machine is equipped with a full set of mining-specific hydraulic cylinders such as excavation arm cylinders, forearm cylinders, bucket cylinders, swing arm cylinders, and lifting cylinders. All cylinders are made of high-strength seamless steel tube cylinders. The piston rods have undergone high-frequency quenching, chromium plating, rust-proof and wear-resistant treatment, and have high hardness, corrosion resistance, and bending resistance. The oil cylinder seal adopts imported high-pressure-resistant, wear-resistant and low-temperature-resistant composite sealing components, with multiple dust-proof and anti-leakage structures, which can effectively resist the intrusion of underground dust and muddy water and eliminate the problems of oil leakage, pressure relief and oil channeling in the oil cylinder. The cylinder has precise stroke, smooth expansion and contraction, no jitter or stuck, and the load-bearing pressure matches the high-pressure hydraulic system of the whole machine. It has an overload buffering function, which can buffer the impact load of materials during operation, protect the cylinder body and structural parts, and is suitable for high-intensity reciprocating operations such as excavation, lifting, and unloading. It has a long service life and is easy to maintain.

6. Oil circuit assembly (oil pipe)

The oil circuit assembly of the whole machine adopts a complete set of mine-used high-pressure steel wire braided hydraulic oil pipes, which are divided into high-pressure oil pipes, low-pressure oil return pipes, and oil suction pipes. The pipeline layout has been optimized and designed to be regular and evenly stressed to avoid hidden dangers of bending, wear, and extrusion. The high-pressure oil pipe adopts a multi-layer steel wire reinforced structure. The pressure resistance level matches the 32MPa peak hydraulic pressure of the whole machine. It is resistant to explosion, tensile and aging, and is suitable for high-frequency and high-pressure hydraulic transmission conditions. All oil pipe joints adopt forged one-piece explosion-proof joints, and the sealing gaskets are made of oil-resistant and wear-resistant rubber material. The connections are tight and there is no leakage or looseness. The entire vehicle pipeline is equipped with special pipe clamps and protective sheaths to avoid friction and damage with structural parts and materials. It also has dust-proof, anti-corrosion, and anti-aging properties. It can adapt to the harsh environment of humid, dusty, and low-temperature underground. The oil circuit is smooth and the pressure is stable, ensuring the accurate transmission of power of the hydraulic system.

7. Electric Motor

Equipped with a mining-grade explosion-proof three-phase asynchronous motor, it possesses MA mining safety certification and explosion-proof certification, fully complying with coal mine explosion-proof operation standards. The motor power is compatible with the power requirements of various ZWY series models, providing ample power, smooth start-up, high operating efficiency, low energy consumption, and low noise. The motor housing is made of thickened cast iron with an optimized heat dissipation structure and equipped with a high-power cooling fan, ensuring no overheating or burn-out during prolonged full-load operation. The internal windings use high-temperature resistant, insulated, and flame-retardant copper wire, offering excellent waterproof, dustproof, and moisture-proof performance, resisting corrosion from the humid, dusty, and explosive gas environments underground. The motor operates stably, with high torque and strong overload capacity, adapting to uninterrupted continuous underground operation with an extremely low failure rate, providing continuous and reliable power input to the entire machine’s hydraulic system and operating mechanism.

8. Scraper chain (non-standard)

The non-standard customized scraper chain for transport trough is specially designed for the transportation conditions of hard materials such as coal mine gravel, slag, gangue, etc. It is different from ordinary standard chains and is forged in one piece with thickened and widened chain plates and thickened high-strength pins. The entire chain has undergone carburizing and quenching and wear-resistant treatment. It has high hardness, tensile resistance, impact resistance, material friction and wear resistance, and is not easy to deform or break. The scraper is made of high manganese steel wear-resistant material with firm welding and strong load-bearing capacity. It can transport large pieces of gangue and slag in batches and is not easy to bend or fall off. The chain adapts to the conveying speed of the entire machine, runs smoothly, and has precise bite, without chain skipping, chain detachment, or chain jamming. It is customized and upgraded for high-load and high-frequency material conveying conditions underground. The wear-resistant life is greatly improved, which can effectively reduce the frequency of chain replacement, reduce equipment maintenance costs, and is suitable for long-term continuous conveying operations.

9. Hydraulic control valve (directional valve)

The mining multi-channel integrated hydraulic reversing valve is used as the core control component of the hydraulic system of the whole machine. It integrates multiple control oil circuits for excavation, travel, transportation, lifting and so on. The valve body is made of high-strength precision cast steel. The internal valve core is precision machined, with precise matching clearance, and is wear-resistant, pressure-resistant and deformation-resistant. The reversing valve has sensitive control and precise positioning, and can accurately control the start and stop, reversal, and speed regulation of each cylinder and motor. The movements are connected smoothly without lag or movement. The valve group has built-in overload relief, pressure compensation, and anti-impact protection functions, which can stabilize system pressure and avoid high-pressure shock damage to hydraulic components. It also has good dust-proof and anti-fouling capabilities, can resist the influence of slight impurities in the hydraulic oil and underground dust, and is anti-valve stuck and wear-resistant. The overall structure is compact, the layout is reasonable, the failure rate is low, and maintenance is simple, ensuring the precise coordinated operation of all operating mechanisms of the machine.

10. Pilot valve (manual foot valve)

The whole machine is equipped with a manual pilot control valve + foot valve combination control system and adopts a hydraulic pilot two-level control mode, which is easy to control, labor-saving and precise, and greatly reduces the operator’s work intensity. The manual pilot valve controls the movements of the excavation arm, bucket, swing arm, etc., with precise proportional control and good micro-movement performance, which can realize precise excavation, leveling, and unloading operations; the foot valve exclusively controls the start and stop of walking and conveying, and is easy to operate and respond quickly, adapting to the rapid operation requirements of complex underground working conditions. The valve body is precision sealed inside, has a stable structure, is wear-resistant and fatigue-resistant, and is suitable for high-frequency control operations. The overall dustproof and waterproof design can adapt to dusty and humid underground working environments. It has no lag or malfunction. It has high control sensitivity, is safe and reliable, and is easy for novices to use. The accuracy and efficiency of operations are greatly improved.

11. Wear-resistant bottom plate

The equipment’s trough, base plate, and conveyor trough base plate are all custom-made from high-strength wear-resistant alloy steel plates. The material is high-manganese wear-resistant steel, processed with a special heat treatment process, resulting in high hardness, impact resistance, and resistance to material erosion and wear. The thickened base plate design can withstand the impact, friction, and crushing of large pieces of gangue and ore, preventing deformation, wear-through, and warping during long-term operation. The plates are cut and welded with excellent precision, resulting in a smooth, burr-free surface that ensures smooth material conveying and prevents material accumulation and jamming. Compared to ordinary steel plates, the wear resistance is improved by more than three times, making it suitable for high-intensity, high-wear slag removal operations underground. This effectively extends the service life of the machine body, reduces the frequency of base plate repairs and replacements, and improves the overall stability and durability of the equipment.

12. Structural parts

The structural parts of the whole machine include core load-bearing structures such as main frame, excavation boom, forearm, bucket, conveyor trough frame, crawler frame, connecting bracket, etc., all of which are welded and formed using national standard high-strength thickened steel. The key stress-bearing parts adopt double-layer reinforcement and rib plate reinforcement technology. The welding joints have been inspected for flaw detection and there are no false welds, slag inclusions, or crack defects. The structure has high strength, good toughness, impact resistance, and distortion resistance. The frame adopts an overall modular design, which is rigid enough, not easily deformed, and can withstand high-intensity impact loads during excavation, lifting, and walking. All structural parts have been treated with rust removal, anti-corrosion, and spray paint protection. They are resistant to underground moisture, rust, and dust erosion, and are suitable for long-term operation in harsh underground working conditions. The overall structure is stable, easy to disassemble and assemble, and has strong load-bearing capacity. The equipment operates without shaking or loosening, and the stability and safety of the entire machine are greatly improved.

13. Electrical System Components

The complete set of electrical system accessories are mine explosion-proof type, with MA mine safety explosion-proof qualifications, and are fully adapted to the flammable and explosive environment of underground coal mines with gas and dust. The core includes explosion-proof electric control boxes, explosion-proof start and stop switches, explosion-proof lighting, sound and light alarm devices, cables, terminal blocks, overload and short circuit protection devices, emergency stop devices, etc. The electronic control system adopts integrated design, with regular circuit layout and standardized wiring, and is equipped with complete overload, short circuit, phase loss and leakage protection functions, which can effectively avoid safety hazards caused by electrical faults. All electrical accessories have excellent waterproof, dustproof, moisture-proof and explosion-proof properties, are anti-interference and operate stably, and can adapt to the complex electromagnetic environment and harsh working conditions underground. The equipment is equipped with an emergency power-off device, which can quickly cut off the power supply in case of emergency, and has a high level of safety protection. The electrical system of the whole machine is simple to operate, has a low failure rate and is convenient to maintain. It meets coal mine safety operating regulations and ensures safe and stable operation of the equipment.

Summary of overall configuration advantages

All components of this ZWY series coal mine excavator loader are configured around the core requirements of mine use: explosion-proof, wear-resistant, durable, efficient, stable, and low failure rate. The hydraulic system provides ample power and precise control, while the walking and conveying system is adapted to complex underground road conditions. The structural components are robust and durable, and the electrical system is safe and compliant. Customized accessories such as non-standard scraper chains and wear-resistant floor plates are specifically designed to address the pain points of high wear and high load operations underground. The machine can operate continuously for extended periods and is suitable for various coal mine roadway excavation, slag removal, and material transfer conditions. Its safety, stability, and durability all meet the high standards of mining operations.