Ask any maintenance supervisor on a mine site what keeps them up at night. Hydraulic hose failures are almost always near the top of the list. A blown assembly on a roof support circuit or an excavator boom doesn’t just leak oil. It halts production, creates a line of fire hazard, and drains the maintenance budget in unplanned change outs.
Over the years we’ve cut open enough failed assemblies to know that the real problem is rarely a bad hose. More often, it’s a mismatch between the assembly and the conditions it faces every shift. Pressure surges hammer the reinforcement. Abrasive dust grinds through covers. Sub zero starts crack the tube. Fittings weep under constant vibration.
At Hengshui Zhehan, we build hydraulic hose assembly for mining machinery as a complete system. Hose, reinforcement, cover, and couplings are engineered to stay sealed and stable in exactly those circumstances.
The field evidence is consistent. Assemblies rated for industrial factory duty don’t hold up long when they’re routed through moving machine frames, dragged over rock, and pressured up to cycle limits in dusty, wet, or gassy environments.
Common failure modes include tube blistering from pulse fatigue, cover abrasion that exposes steel wire, fitting leaks from undersized crimp, and cold weather cracking. All of it leads to unscheduled downtime.
What’s needed is an assembly designed with the whole machine and the whole working environment in mind.
We start with the hose itself. The inner tube is a nitrile based synthetic rubber that resists both mineral oil and water based hydraulic fluids. It is reinforced by multiple layers of high tensile steel wire in either braided or spiral configuration.
The outer cover is a tough chloroprene compound. It’s chosen for its resistance to abrasion, weathering, ozone, and oil splash.
Then comes the part that makes an assembly an assembly: the coupling. We use a controlled crimping process with matched dies for each hose and stem/ferrule combination. This produces a connection that locks the reinforcement without damaging the tube. The result is consistent grip, full pressure retention, and a seal that holds even when the line is bounced around on a drill feed or a crusher hydraulic circuit.
Underground coal and gassy mines. Roof supports, shearers, stage loaders, and AFC hydraulic circuits. Assemblies operate in high humidity, variable pH mine water, and airborne coal dust that wears out soft covers quickly. Specified with anti static and flame retardant covers, they help mines meet safety requirements in return airways and face areas.
Open pit metal and non metal mines. Excavators, wheel loaders, blast hole drills, haul truck hoist and steering circuits. They endure rock strike, continuous sun load, and temperatures that swing from deep freeze to desert heat. The chloroprene cover resists surface crazing and hardening far better than general purpose hose left out in the pit.
Hard rock development and tunneling. Jumbos, bolters, roadheaders. High frequency vibration, tight bending radii around feed beams and articulating booms, and constant scuffing against rock demand assemblies that maintain full pressure integrity cycle after cycle.
Aggregate crushing and processing plants. Jaw and cone crushers, screens, conveyor tensioners, hydraulic breakers. Repetitive pressure spikes and flying debris require exceptional impulse capacity and outer cover toughness.
Depending on size and construction, working pressures range from 3 MPa up to 100 MPa, with a 4:1 burst safety factor. That covers everything from low pressure return lines to high pressure shearer ranging arm circuits.
Our spiral wound assemblies exceed one million impulse cycles in bench testing. Braided assemblies surpass three hundred thousand cycles. This matters on machines that start, stop, and reverse high flows hundreds of times a shift, like hydraulic breakers, excavator attachments, and crusher lids.
By reinforcing the chloroprene cover with abrasion resistant modifiers, our assemblies show more than 50 percent improvement in cover wear life compared to standard mining hose assemblies. That’s based on our own dry sand slurry wear tests. In the field, it means fewer protective sleeves are needed and change out intervals become longer.
The assembly remains flexible and seal tight from minus forty degrees Celsius to plus one hundred twenty degrees Celsius. It won’t stiffen into a plastic like state in a Canadian winter pit or soften excessively near an engine bay in a tropical site.
We proof test every single assembly at one point five times rated working pressure before it ships. Couplings are selected for positive mechanical lock and sealing geometry. What leaves our facility is an assembly you can pressure up and forget about.
Standard or custom, we build assemblies that fit how your machine works. We regularly produce non standard inside diameters from six millimeters up to one hundred two millimeters, and lengths anywhere from half a meter to over fifty meters.
If your equipment operates on a particular fire resistant fluid like phosphate ester or water glycol, specify it and we’ll match the tube compound.
Need bent tube or flange type ends, threaded standoffs, or specific layline markings for your maintenance crew? We do that every week.
Send a sample, a drawing, or just the working conditions. We’ll propose an assembly that drops into the existing routing without modifying hose clamps or guards.
|
Parameter |
Detail |
|
Working pressure range |
3 MPa to 100 MPa (custom high pressure builds available) |
|
Inside diameter |
6 mm to 102 mm (full size range) |
|
Length capability |
0.5 m to 50 m and beyond (cut to order) |
|
Assembly construction |
Tube: nitrile synthetic rubber. Reinforcement: high tensile steel wire braid or spiral. Cover: abrasion and weather resistant chloroprene rubber |
|
Temperature range |
-40 °C to +120 °C |
|
Testing |
1.5× WP proof test on every assembly. Impulse and burst validation in conformance with industry standards |
Use assemblies only with matched couplings. Never force a tight bend below the hose’s specified minimum bend radius. We recommend a minimum three times the hose ID radius. Route assemblies away from hot surfaces, sharp edges, and moving tracks. Support heavy spans with proper clamps.
Visually inspect assemblies before each shift. Look for cover wear, blistering, kinks, or fitting displacement. Any sign of oil mist around the collar or ferrule is a warning that the crimp may need attention.
Wipe down assemblies periodically with a clean dry cloth. Avoid letting layers of abrasive dust or corrosive mud build up on the cover. Spare assemblies should be stored indoors, cool and dry, with end caps in place and away from electrical equipment and chemical stores.
Replace any assembly that shows cover cuts deep enough to expose reinforcement, permanent kinking, soft spots, or blistering. A weeping fitting should never be tightened and ignored. It’s telling you the seal has been compromised.
We only need a few assemblies to trial on one machine. Is that possible?
Yes. There’s no harsh minimum order quantity. You can order a small batch for field testing. When you’re ready to roll out across the fleet, we’ll scale up production and can phase deliveries around your maintenance windows.
A lot of our equipment is imported and uses odd sized fittings and hose lengths. Can you build direct replacements?
We do this frequently. Send us a used assembly, the original part number, or a simple sketch with the end connections. We’ll match the dimensions, pressure rating, and routing length. Even specific layline markings or color coding for different circuits can be applied.
What’s your warranty on mining assemblies?
Every assembly carries a two year warranty against material and workmanship defects under normal mining and construction conditions. If an assembly fails due to our manufacturing, we replace it free of charge and work with your team to understand the root cause so it doesn’t repeat.
How do you guarantee zero leaks right out of the box?
We crimp on matched tooling for each hose and fitting combination. Then we pressure test every finished assembly at one point five times the rated working pressure. Your assembly arrives with test traceability and arrives dry and ready to install.
We run water glycol and other fire resistant fluids. Will your assemblies handle them?
Absolutely. Our standard nitrile tube is compatible with mineral oil and water based fluids. We can also supply compounds specifically formulated for phosphate ester fluids. Just tell us your fluid type when ordering and we’ll ensure chemical compatibility.
We’re seeing repeated hose failures on one particular machine function. Can you help us figure out what’s wrong?
Yes, we offer on request application review. Share the failed assembly, operating pressure data, routing photos, and fluid type. Our team will help identify whether the root cause is pressure peaks, heat, routing stress, or a mismatch in specification. We’ll then recommend an assembly that solves it.
Ready for assemblies that stay leak free shift after shift?
Whether you’re re hosing a single excavator or standardizing assemblies for an entire underground fleet, we’re equipped to deliver.
Reach out to Hengshui Zhehan Rubber & Plastic Products Co., Ltd. with your working pressure, inside diameter, length, end fitting type, and any special conditions like fluid type, temperature, or cover requirements. We’ll come back with a practical quote and a production timeline that fits your schedule.
Factory direct pricing, consistent quality, and fast turnaround are part of the package.
Address
No. 7126, Zhanggehou Rubber & Plastic Base, Jingzhou Town, Jing County, Hengshui City, Hebei Province, Chinaa
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