76 Unit Dual Station Unwinding Machine Technical Parameters: Integration, Spare Parts and Maintenance FAQ

The 76 Unit Dual Station Unwinding Machine Technical Parameters are a common reference point for procurement engineers, maintenance technicians, and production-line integrators who work with welded pipe equipment. The questions below are organised around three practical themes: how the machine fits into a production line, which hydraulic and mechanical components are involved, and what buyers should know about spare parts and maintenance. All answers are sourced from the confirmed product documentation.

Integration into a Welded Pipe Production Line

Q1 — What is the role of the 76 Unit Dual Station Unwinding Machine in a welded pipe production line?

The dual-station hydraulic expansion and contraction unwinding machine is an important component for feeding the entire welded pipe production line. Its main function is to lift and tighten the steel coil so that it can be safely and stably fixed on the turntable during high-speed feeding and storage, greatly improving the safety factor and effectively reducing production noise and labour intensity of workers.

Q2 — How does the dual-station design reduce production downtime?

The equipment is equipped with two stations, making it convenient for one station to clamp the original components in advance while the other station is running. This saves the traditional single-station "one material, one loading" process, saving working time and relaxing the tense working atmosphere of workers, making the originally tense and tiring work easy and semi-automatic mechanical operation.

Q3 — What strip widths and coil dimensions is this machine designed to handle?

According to the confirmed technical parameters:

• Expansion/contraction range: 430–530 mm (100 mm range)
• Strip width: 60–250 mm
• Centre height: 1,150 mm
• Uncoiling shaft diameter: ∅150 mm (inner hole ∅65 mm)

Large-aperture raw materials can be accommodated by adding shims.

Hydraulic System and Drive Components

Q4 — What hydraulic motor and drive motor power are specified for the 76 Unit machine?

The hydraulic station for the 76 unwinding machine specifies:

• Hydraulic motor: 1 × BM3-500 J shaft (reversing, speed regulation)
• Drive motor: 7.5 kW, paired with a vane pump with a displacement of 25

Q5 — What cylinders are used, and what are their specifications?

Four cylinders:

The rotation form uses a hydraulic motor driving the slewing support bearing to rotate 180 degrees, with the positioning pin axis also actuated hydraulically.

Q6 — How is material feeding achieved, and what prevents the coil from loosening during operation?

Feeding is driven by a hydraulic cylinder pressing a motor to rotate the material disc so that the material head is led out, saving feeding time and reducing labour intensity. On the working side, there is a hydraulic advance-and-retreat blocking device specifically designed to prevent the material roll from loosening. The rotary table is driven by an oil cylinder to block the material as a whole. Braking is electric-hydraulic.

Shaft Material, Bearings and Spare Parts

Q7 — What material is the uncoiling shaft made of, and why?

The uncoiling shaft material is 42CrMo (inner hole ∅65 mm). This material belongs to the spring steel category and offers good strength, hardenability, and toughness — properties that make it suited to the cyclic loading and tightening forces experienced during continuous coil feeding.

Q8 — Which bearing models are fitted, and where are they positioned?

Two bearing types:

• Front bearing: Self-aligning roller bearing 23130 — the self-aligning design compensates for minor shaft deflection under heavy loads.
• Rear bearing: 352026 bearing.

When sourcing replacement bearings, using the confirmed bearing model numbers (23130 front, 352026 rear) against the actual machine serial number is recommended before ordering.

Q9 — What is the expansion and contraction mechanism, and which parts are most relevant for maintenance planning?

Expansion and contraction are completed by the sliding block driving the sliding sleeve. The key components in this sub-assembly — and therefore the most relevant for a spare-parts plan — are:

• The expansion/contraction cylinders (∅140/60 × 95 mm × 2)
• The positioning pin cylinder (∅63/35 × 100 mm × 1)
• The sliding block and sliding sleeve assembly
• The 42CrMo uncoiling shaft
• Self-aligning roller bearing 23130 (front) and 352026 bearing (rear)
• The BM3-500 J hydraulic motor

Operation and Safety

Q10 — How does the machine improve operator safety compared with conventional single-station unwinders?

The dual-station hydraulic design improves safety in two principal ways documented in the specifications. First, the hydraulic expansion system secures the steel coil firmly and stably on the turntable during high-speed feeding, greatly improving the safety factor. Second, the pre-loading capability of the second station removes the pressure of rapid manual loading between coil changes, reducing the risk of rushed or incorrect handling. The machine also effectively reduces production noise and labour intensity of workers.

For detailed configuration requirements, please contact BzZhou Xinghua Machinery Equipment Manufacturing Co.,LTD. to confirm specifications against your specific production-line layout.