Products Description
The YNJX250 Planetary Clamping Bucking Unit is a professional hydraulic bucking machine designed for precision make-up and break-out of oilfield tubing, casing, and downhole tools. It supports pipe O.D. 60–140mm (2‑3/8" to 5‑1/2") with a wide gripping range of Ø60–Ø230mm without requiring die changes, and delivers a maximum torque of 20 kN·m (14,751 ft·lb) at 20MPa. Equipped with Siemens S7‑1200 PLC and 15" industrial computer, it ensures accurate torque and turns monitoring, automatic operation, and stable performance. Adopting three-point synchronous planetary clamping structure, this tubing casing bucking machine provides reliable, non-slip gripping without damaging threads, widely used in oilfield downhole tool assembly, production and repair lines.
Key Features & Specs
High Torque & API Compliance
Delivers up to 20 kN·m (14,751 ft·lb) maximum makeup torque at 20MPa pressure, suitable for medium to large diameter tubing and casing applications. Meets API standards with reliable clamping and die marking.
3-Point Planetary Clamping System
Adopts planetary clamping structure with three-point synchronous clamping. Wide gripping range of Ø60–Ø230mm requires no die changes within this range.
Split-Structure Design
Features a split-structure design specifically developed for assembling and disassembling various downhole tools (packers, jar tools, etc.). 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.
Intelligent Control & Data Traceability
Configured with Siemens S7-1200 PLC and 15" industrial computer, supporting auto/manual operation. All torque and turn data are automatically recorded for complete traceability.
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. YNJX250 Planetary Clamping Bucking Unit 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
1) 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.
2) The clamping range is wide (Ø60 mm to Ø230 mm) and does not require jaw/dies replacement within this range.
3) 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.
4) 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
1) 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.
2) The backup tong is mounted on a trolley that moves along the machine bed via chain drive for easy adjustment.
3) 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.
4) 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
1) Power Tong Assembly
2) Backup Tong Assembly
3) Electrical-hydraulic Control System
4) 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. |
III. Reference Images of YNJX250 Bucking Unit
1. Standard YNJX250/68 Bucking Unit
2. YNJX250/68 Bucking Unit Exported to Iraq
3. YNJX250/68 Bucking Unit to CNPC, China
FAQ
Q1. What pipe sizes does the YNJX250 planetary clamping bucking unit fit?
A1. The YNJX250 planetary clamping bucking unit supports pipe O.D. 60–140mm (2‑3/8" to 5‑1/2"). Its wide gripping range of Ø60–Ø230mm requires no die changes within this range.
Q2. What is the maximum torque of this oilfield bucking machine?
A2. This oilfield bucking machine offers a maximum make-up and break-out torque of 20 kN·m (14,751 ft·lb) at 20MPa hydraulic pressure, suitable for medium to large diameter tubing and casing applications.
Q3. Is the YNJX250 API compliant?
A3. Yes, this API bucking unit fully meets API specifications. Die marking follows API standards, and optional non-marking dies are available to protect chrome and premium threads.
Q4. What control system does this hydraulic bucking machine use?
A4. It adopts Siemens S7‑1200 PLC with a 15" industrial computer for auto/manual operation, real-time torque-turn recording, and automatic stop at preset torque values.
Q5. What is included in the standard supply of YNJX250?
A5. The standard package includes the main YNJX250 bucking machine, hydraulic unit, control cabinet, dies (10 pcs), micro-dies (10 pcs), and complete documentation (QC certificate, warranty, manual, and drawings).
Boyu Petroleum Equipment owns over 30 years of professional experience in R&D and manufacturing of hydraulic bucking units, steel pipe hydrostatic testing machines, and pipe straightening machines.
If you need professional pipeline hydrotesting equipment and oilfield bucking unit solutions, please contact us for detailed parameters and quotation.
Hot Tags:
