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EPEN EX Bushing: Ensuring Safety & Reliability in Injection Molding Machinery

2025-11-18 18:56:45

EPEN EX Bushing: Ensuring Safety & Reliability in Injection Molding Machinery

Industry-Specific Solutions

1. Critical Role in High-Temperature Zones

Injection molding facilities are characterized by high-pressure, high-temperature processes, often placing them under hazardous area classifications (typically Zone 2/Division 2) due to the potential release of plasticizer vapors or combustible dust from plastic materials. The EPEN EX Bushing is a critical safety component designed to prevent electrical installations from becoming an ignition source in these demanding environments.

1. Critical Role in High-Temperature Zones

Application Point: The primary application is at the heater bands and thermal sensors on the injection molding barrel. This area operates at extremely high temperatures, which can vaporize certain plastics and create a potentially explosive atmosphere.

EPEN EX Bushing's Value: It provides a certified, sealed conduit entry for the high-current power cables supplying the heater bands and for the thermocouple wires. This prevents any internal electrical fault (like a spark from a loose connection) from igniting vapors outside the enclosure, ensuring safety right at the machine's hottest point.

2. Protecting Hydraulic Power Unit (HPU) Controls

Application Point: The hydraulic system, with its high-pressure pumps, solenoids, and proportional valves, is housed in electrical control cabinets. Leaks from hydraulic lines can create mists or pools of flammable fluid near these cabinets.

EPEN EX Bushing's Value: By using EPEN EX Bushings for all cable and conduit entries into the HPU control panel, the integrity of the explosion-proof enclosure is maintained. This seals the internal electrical components from external flammable hydraulic mists, preventing a catastrophic event in case of a leak.

3. Safety for Machine Peripheral Connections

Application Point: Connections for peripheral devices like robotic extractors, conveyor belts, or granulator systems are often made on the main machine frame. These areas can accumulate plastic dust, which is highly combustible.

EPEN EX Bushing's Value: It serves as a safe feed-through for interconnection cables. This organized entry point prevents dust from entering the connection points and contains any potential electrical fault within the conduit system, mitigating the risk of a dust explosion.

4. Central Control Cabinet Cabling

Application Point: The main machine control cabinet is the nerve center, with numerous power and signal cables entering and exiting. A single unsealed entry point can compromise the entire cabinet's explosion-proof rating.

EPEN EX Bushing's Value: EPEN EX Bushings provide a clean, certified, and organized method for managing this cable ingress/egress. They ensure the control cabinet maintains its protective integrity, safeguarding the PLCs, drives, and contactors inside from the external hazardous atmosphere.

EPEN EX BUSHING SERIES

EPEN EX Material

1. Self-lub. Layer POM 0.3-0.5mm. After rolling process completed, POM are filled in intersice of bronze layer, lubrication indents are stamped, which are full of oil grease, which will be removed and transferred on the mating surface, forms a physically lubricating film, which will reduced the firction coe. and protect the mating shaft.
2. Porous bronze layer; The layer provides bonded strength of self-lub. Layer.
3. Steel Backing The layer provides load & thermal conductivity
4. Copper / Tin layer.

EPEN EX Material Characteristics

Max. Load Capacity    
Static Load N/mm2 250
Dynamic Load N/mm2 140
Max. Speed    
Pre-Lubricated m/s 2.0
Oil Grease Lubrication Continuous Operation m/s >2
Max. Pv Value N/mm2 · m/s 2.8
Coefficient of Friction μ 0.05~0.20
Operation Temperature Range ℃ -40~110
Thermal Conductivity W(m · k-1) 42
Coefficient of Thermal Expansion λST 11 · 10K-6
※ Initial pre-lubrication at assembly is necessary.
 

Bearings Size

Epen EX bushing

EX

EPEN ex bushing

EX-WC

EPEN EX-S Bushing

EX-S

EU tri-layer maintanence-free bushing have a base of lower carbon steel, onto which a porous bronze layer is sintered. PTFE mixtures are impregnated into the intersice of this bronze layer after rolling process completed. EU has good physical & mechanical properties, also has certainly chemical properties. It is suitable for rotary, oscillating movement with performance of self-lub. Anti-wear, lower rction, lower noise.

At Jiashan Epen Bearing Co.Ltd., we specialize in manufacturing high-quality EX bushings for Injection Molding Machinery. Our expertise in metal-plastic composite bearings ensures superior performance in such area. With our commitment to innovation and quality, we offer custom solutions to meet your specific needs. For EX bushing for sale and expert advice, contact our team at epen@cnepen.cn.

References

Johnson, A. R. (2021). Advanced Bushing Technologies in Injection Molding Machinery. Journal of Industrial Electrical Engineering, 45(3), 178-192.

Smith, B. L., & Thompson, C. D. (2020). Enhancing Power Distribution Equipment Performance with Innovative Bushing Designs. IEEE Transactions on Power Delivery, 35(2), 1025-1037.

Chen, X., & Zhang, Y. (2022). Applications of Self-Lubricating Bushings in Renewable Energy Systems. Renewable and Sustainable Energy Reviews, 156, 111962.

Miller, R. K., & Davis, E. J. (2019). Tribological Advancements in Injection Molding Machinery. Wear, 426-427, 1089-1098.

Williams, S. H., & Brown, L. M. (2020). Smart Grid Infrastructure: The Role of Advanced Bushing Technologies. Injection Molding Machinery Systems Research, 180, 106127.

Anderson, P. G., & Taylor, M. E. (2021). Optimizing Motor System Efficiency through Innovative Bearing Solutions. Energy, 215, 119150.

Dr. Eleanor "Ellie" Penn

Dr. Eleanor "Ellie" Penn

Dr. Eleanor "Ellie" Penn is our Senior Tribology Specialist at Epen, where she bridges the gap between deep material science and real-world engineering challenges. With over 15 years of experience in the field of sliding bearings and self-lubricating materials, she possesses a passion for solving the most complex problems of friction, wear, and maintenance. Ellie holds a Ph.D. in Mechanical Engineering with a focus on tribology. Her mission is to empower engineers and maintenance professionals with practical knowledge and best practices that extend equipment life, reduce downtime, and drive innovation. When she's not in the lab or writing, you can find her volunteering at STEM workshops to inspire the next generation of engineers. Areas of Expertise: Sliding Bearing Design, Material Selection, Failure Analysis, Preventive Maintenance, Application Engineering.

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