Hydraulic Support Cylinder

Hydraulic Support Cylinder for Fully Mechanized Coal Mining

Jiangsu Hengcai Hydraulic Mechanical Co., Ltd. has manufactured hydraulic support cylinders since 1988. Our factory in Jianhu County, Yancheng, Jiangsu supplies the Hydraulic Support Cylinder manufacturer range for roof supports used in comprehensive mechanized coal mining faces. The support cylinder delivers the lifting, locking, load-bearing and buffering functions of the hydraulic support, so pressure stability and movement response directly determine mining safety and production continuity.

Underground working conditions combine high humidity, dust, corrosive gas and frequent vibration. Our new structure design improves internal quality and makes maintenance easier, particularly when disassembly must be done in a narrow coal face. Related actuators for the same mining machinery are listed in our Coal Mine Hydraulic Cylinders range.

Specification Range and Support Type Fit

We cover different hydraulic support types within the envelope below. The exact bore, stroke and rod size are matched to the support model, mining height and required force, rather than supplied as a fixed standard.

Lower bore diameters are generally applied to auxiliary jacks and advancing cylinders; larger bores are used for main roof legs that carry high roof load and need high setting force. Our proposal states the push and pull force for the specific working pressure, not only as a theoretical maximum.

Configuration and OEM Approach

Support manufacturers use different leg layouts, mounting interfaces, port positions and rod-end connections. We configure each cylinder from the customer drawing or sample, and we also develop a design when only the support type and duty are available. The work includes key force calculation, rod buckling check, cylinder wall strength analysis and closing-dimension control.

Our cylinders serve more than 40 large and medium main-machine factories and are exported with the original machines to the United States, Japan, Russia and other markets. For coal mine projects that also use a head machine or advancing actuator, we supply the Head Machine Hydraulic Cylinder from the same factory control system.

Materials, Surface Protection and Manufacturing Control

For long service in corrosive mine water, we use high-strength alloy steel, corrosion-resistant coatings and high-performance seals. The piston rod surface is specially hardened to improve impact and wear resistance while maintaining precise movement during high-frequency operation.

Core processes are kept in-house: welding, heat treatment, electroplating and spraying. Heat treatment uses an overall tempering unit or fully automatic surface induction heating, followed by hardness testing, tensile testing and metallographic analysis. The factory has 22 manufacturing processes and 109 processing capabilities, with a self-made parts rate of about 70%. Annual output exceeds 80,000 hydraulic cylinders, supporting both serial OEM supply and maintenance replacement batches.

Quality Assurance and Acceptance Testing

Quality control begins with material verification and ends with performance tests on the finished cylinder. We hold ISO 9001, ISO 14001 and CE certification, and the company is recognized as a national high-tech enterprise. Physical/chemical and metallographic laboratories check composition, mechanical properties and dimensional accuracy.

• Durability test bench for long-cycle load and pressure testing.
• Reciprocating and buffer comprehensive performance test bench for dynamic behavior.
• Coating tests for thickness, hardness, adhesion and corrosion resistance.
• Digital inspection records for key cylinder dimensions and assembly data.

Installation, Automation Integration and Training

The cylinder is one component of a larger support control system. We match port sizes, thread types and connector positions to the customer supply and return lines, and we verify the extension and retraction behavior under the declared flow and pressure. For electro-hydraulic and remote centralized control faces, stable breakaway pressure and consistent stroke-end behavior are critical because the support advances repeatedly after each mining pass.

Our after-sales scope includes installation guidance, commissioning support and operator training. This allows the mine team to check rod cleanliness, seal condition and pressure drop during scheduled maintenance without waiting for a factory visit.

Maintenance, Spare Parts and Service Support

Maintenance in an underground face is constrained by space, lighting and limited lifting equipment. The support cylinder is therefore designed with a modular quick-disassembly layout. Replacing seals, guide bearings and damaged metal parts can be done without removing the complete support from the working face.

• Long-term supply of accessories: metal parts, pipe joints, sealing rings and rubber parts.
• Quality problem response within 24 hours, with a diagnostic plan within 3-5 days.
• One-year warranty against defects in material and workmanship under normal use.
• Replacement cylinder or discount arrangement if a warranty failure occurs.

Information We Use to Configure Your Solution

To prepare a configuration and quotation, we need the support type or drawing, the duty cycle, and the interface data of the existing hydraulic system. The most useful project input includes:

• Hydraulic support model or original drawing number.
• Bore diameter, rod diameter, stroke and closed length.
• Working pressure and required setting or yield force.
• Mounting and rod-end connection details.
• Port size, position and thread standard.
• Seal system, fluid type and operating temperature range.
• Surface protection requirement and expected mine water chemistry.
• Quantity, packaging and delivery target.

With this information, we can prepare a bore/stroke proposal, force calculation and acceptance test plan specific to your support model.

Frequently Asked Questions

Why is the hydraulic support cylinder so important in fully mechanized mining?

The support cylinder is the actuator that lifts, locks and buffers the roof support. If it moves slowly or loses pressure, the support may fail to carry the roof in time. Reliable movement and pressure stability are therefore essential to both production continuity and personnel safety.

What are the main failure modes in underground service?

Common failure modes include seal aging, piston rod rusting, cylinder barrel corrosion and structural fatigue caused by high humidity, dust, aggressive gas and vibration. We address these with hardened rod surfaces, corrosion-resistant coatings, high-performance seals and easier disassembly so worn parts can be changed quickly in the face.

Can you build a cylinder to our support drawing?

Yes. Our OEM program covers production from customer drawings or samples, including mounting dimensions, port position, sealing system and surface protection. If only the support type is given, our R&D team can propose a design and refine it with you before manufacturing.

What tests does the cylinder receive before delivery?

Finished cylinders are checked on durability and reciprocating/buffer performance test benches. We also carry out coating tests and material checks in physical/chemical and metallographic laboratories. ISO 9001, ISO 14001 and CE certificates define the management system and product compliance scope.

How is maintenance handled when the cylinder is underground?

The modular structure allows seal and guide bearing replacement without taking the whole support out. We supply spare metal parts, pipe joints, sealing rings and rubber parts for the cylinders we manufacture. After a reported quality problem, our service team responds within 24 hours and works with the mine to provide a diagnosis and action plan.

Related Products and Categories

Our portfolio also includes Aerial Working Equipment Hydraulic Cylinder for applications with different operating ranges, interfaces or integration requirements.