YNJX250 Bucking Unit-Bucking Unit

Products Description

Equipment Parameters

Specification	Value
Model	YNJX-250
Bore Diameter	Φ 250m (~Φ 9-7/8'') (Customizable, available for larger size, e.g. YNJX270)
Centre Height	850mm (Customizable, available for larger or smaller sizes)
Application	O.D. 60-140mm (Φ 2-3/8'' to 5-1/2'')
Speed Range	Rotation speed: Low gear: 1-7r/min, High gear: 8-15r/min
Make-up/Break-out Torque	Max. make-up/break-out torque: 14,751 ft.lb (20 kN.m) @ 20MPa pressure
Application Scenarios	Make-up, break-out tubulars including tubing, casings, and downhole tools or assemblies
Torque Display	The computer can display, record and control the torque and turns
Control Mode	Simens S7-1200 PLC + 15" all-in-one computer, operation with buttons; The machine will stop automatically reaching the setting torque
Torque Accuracy	150 ft.lb
Dies Marking	According to API standards, no damage to pipe accuracy; Optional no-marking dies (Fe-free for special materials like chrome, and no marking on pipe surface)
Motor Power	30kW (Customizable), ABB Frequency converter control
Hydraulic System	Max. pressure: 16MPa; Flow rate: 30-180L/min
Total Weight	7.5T
Dimensions	Main machine: 4m × 1.6m × 1.45m (Customizable, available for larger or smaller sizes)
Stroke (Backup Tong)	3m (Customizable, available for larger or smaller sizes)
Connections	API (Round & BTC) and Premium connections (TS3SB, VAM, BDS, SEC, AB, ANTARES, T Blue, etc.)
Turns Accuracy	Resolution: 1/1000
Torque Control Accuracy	Torque ≤ 3120N.m: ±5%; 3120N.m ≤ Torque ≤ 7800N.m: ±156N.m; Torque ≥ 7800N.m: ±2%

Note: The conversion for 50 kN.m to ft.lb is approximately 36,878 ft.lb.

I. Structures and Features

The YNJX250/68 bucking machine is primarily used in oilfields for make-up and break-out operations of downhole tools, threaded connections, casing, drill pipes, tubing, and other threaded components during manufacturing, assembly, and maintenance. It features high torque and smooth transmission.

YNJX-250/68 High-Torque Hydraulic Bucking Machine

The YNJX-250/68 hydraulic bucking machine features a split-structure design, specifically developed for assembling and disassembling various downhole tools in oilfields, such as different types of packers and jar tools. The design allows operators to conveniently operate the equipment on the machine bed platform. The hydraulic power unit is separated from the main body, making it easier to clean the oil tank, reduce noise, and improve oil cooling efficiency. The cooling system adopts an air-cooled cooler.

Power Tong Assembly
The power tong is used to grip and rotate the coupling for make-up and break-out operations. It is driven by a hydraulic motor through a speed-changing mechanism and gear transmission, which rotates the internal ring gear. This in turn drives the planetary gears, which activate the planetary clamping arms. The three planetary arms clamp the pipe simultaneously, ensuring strong, reliable grip without slippage.
The clamping range is wide (Ø60 mm to Ø230 mm) and does not require jaw/dies replacement within this range.
Given the high torque output of this model, reinforced gears are used in the design and manufacturing to enhance strength and ensure long-term reliability.
The power tong features a band-type brake system, known for its long service life, easy maintenance, low consumption, and cost-efficiency.

Backup Tong Assembly
The backup tong grips the pipe body during make-up and break-out operations to prevent rotation. It uses a pneumatic or hydraulic cylinder-driven clamping mechanism, providing secure and reliable grip.
The backup tong is mounted on a trolley that moves along the machine bed via chain drive for easy adjustment.
Equipped with a floating clamping structure and a tension sensor for torque measurement, the sensor transmits data to an industrial computer, which displays real-time torque readings during operations.
The system uses a PLC + IPC (Industrial PC) control system for automated operation. It can display real-time torque, historical curves, data logs, and parameter settings. It also supports printing and saving of daily/monthly reports and torque curve graphs.

Main Parts of YNJX250 Planetary Clamping Bucking Machine:

Power Tong Assembly
Backup Tong Assembly
Electrical-hydraulic Control System
Control System (PLC + Upper Computer)

Key Parts Images

Control Cabinet and Torque-turn Curve of Bucking Unit

Non-marks Dies

II. Scope of Supply

No.	Name	Qty. (set/pcs)	Remarks
1	Bucking machine	1 set	Includes power tong assembly, backup tong assembly, basement, and two moving supports.
2	Hydraulic unit	1 set	Includes hydraulic pump, valves, integrated package, oil tank, motor, fan cooler, and pipeline.
3	Control cabinet	1 set	Includes control panel, computer, and control box.
4	Dies	10 pcs	—
5	Micro-dies	10 pcs	—
6	Documents	1 set	Includes QC certificate, warranty certificate, operation & maintenance manual, installation drawing, and e-drawing.