Products Description
The YNJX120 Planetary Clamping Bucking Unit is a professional hydraulic bucking machine designed for precision make-up and break-out of oilfield tubing, sucker rod, and pipe coupling. It supports pipe O.D. 15.88–114mm (5/8" to 4-1/2") and delivers a maximum torque of 6 kN·m (4,425 ft·lb) at 10MPa. Equipped with Siemens S7‑1200 PLC and 15" industrial computer, it ensures accurate torque and turns monitoring, automatic operation, and stable performance. Adopting four-point synchronous planetary clamping structure, this tubing bucking machine provides reliable, non-slip gripping without damaging threads, widely used in oilfield maintenance and pipe assembly lines.
Key Features & Specs
Precision Torque & API Compliance
Delivers up to 6 kN·m (4,425 ft·lb) maximum makeup torque at high gear (2 kN·m at low gear) under 10MPa pressure. Meets API standards with reliable clamping and die marking.
4-Point Planetary Clamping System
Adopts planetary gear rotation mechanism with four-point simultaneous clamping. Provides strong, reliable, and non-slip clamping force with smooth transmission.
Dual-Speed Operation
Equipped with high and low gear shifting, torque can be adjusted freely. Supports manual operation, automatic button control, and microcomputer automatic control — selectable according to user preferences.
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-120 |
| Bore Diameter | Φ 120m (~Φ 4-3/4'') |
| Centre Height | 810mm (Customizable, available for larger or smaller sizes) |
| Application | O.D. 15.88-114mm (Φ 5/8'' to 4-1/2'') |
| Speed Range | Rotation speed: Max. Low gear: 12r/min, Max. High gear: 36r/min (Customizable, available for higher speed) |
| Make-up/Break-out Torque | Max. make-up/break-out torque: 4,425 ft.lb (6 kN.m) @ 10MPa pressure |
| Application Scenarios | Make-up, break-out tubulars including sucker rod, plunger of sucker rod pump, tubings, etc. |
| 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 | 15kW (Customizable), ABB Frequency converter control |
| Hydraulic System | Max. pressure: 10MPa; Max. flow rate: 120L/min |
| 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 6 kN.m to ft.lb is approximately 4,425 ft.lb.
I. YNJX120 Planetary Clamping Bucking Unit Structures and Features
1. Common YNJX120/06 Planetary Clamping Bucking Unit
The YNJX120/06 bucking machine，a high-performance hydraulic bucking machine and bucking unit for oilfield tubing, adopts a planetary gear rotation mechanism with four-point simultaneous clamping. It provides strong, reliable, and non-slip clamping force with smooth transmission. Equipped with high and low gear shifting, the torque can be adjusted freely, ensuring both safety and flexibility.
Operation system: Supports manual operation, automatic button control, and microcomputer automatic control — selectable according to user preferences.
The machine head is designed to clamp the coupling and is driven by a hydraulic motor to rotate, enabling the make-up and break-out of threaded connections for oilfield tubing. It allows for two different speeds and torque levels during operation.
2. YNJX120/06 Plunger (Sucker Rod Pump) Bucking Unit
The hydraulic dual-friction backup tong bucking machine for sucker rod pump plungers consists of three main components: the main unit, the hydraulic power source, and the control console.
1. Main Unit: Composed of a platform body, guide rails, power tong assembly, friction backup tong assembly, and support bracket.
2. Support Bracket: Capable of moving longitudinally along the guide rails, it is used to hold and position the sucker rod pump plunger into the backup tong and main tong.
3. Friction Backup Tong Assembly: Consists of a roller trolley, body clamping cylinder assembly, movable die holder and dies. The hydraulic cylinder drives the lever mechanism to clamp the dies tightly against the sucker rod pump plunger. Made of ductile cast iron, the dies are customized to match different plunger outer diameters. The curved die surface ensures full contact with the plunger to achieve stable friction clamping.
4. Power Tong:Assembly: It adopts planetary gear transmission. The internal gear ring drives four planetary gears and planetary jaws fitted with arc-shaped tooth plates. During operation, the jaws extend outward to grip the plunger at four points around the valve cover for make-up and break-out rotation.The power tong is equipped with a two-speed transmission: high speed for makeup, low speed for breakout, and high speed for final loosening. Driven by a hydraulic motor supplied with hydraulic oil from the power unit, it drives the dual gear set, intermediate gear and large gear to deliver steady rotary power.
3. YNJX120/06 Sucker Rod Bucking Unit with Dual Power Tong and Friction Backup Tong
The YNJX120 sucker rod bucking unit consists of three main components: the main unit, the hydraulic power station, and the control console. Its advantage lies in the dual power tong structure, which allows assembly and disassembly operations to be completed without changing the orientation of the sucker rod or the workpiece, resulting in a significant improvement in efficiency.
1. Main Unit: Composed of a platform body, guide rails, 2 power tong assemblies, friction backup tong assembly, and support bracket.
2. Support Bracket: Capable of moving longitudinally along the guide rails, it is used to hold and position the sucker rod into the backup tong and power tong.
3. Friction Backup Tong Assembly: It consists of a roller trolley, clamping cylinder assembly, movable die holder and dies. Driven by hydraulic cylinder leverage, the dies firmly clamp the sucker rod. Made of ductile cast iron, dies are customized for different rod outer diameters. The curved die surface achieves full contact with the rod to realize stable friction clamping.
4. Power Tong Assembly: This core component of the hydraulic bucking machine adopts planetary gear transmission. The internal gear ring drives four planetary gears and planetary jaws with arc-shaped tooth plates. When rotating, the jaws extend to grip the plunger at four points around the valve cover, completing make-up and break-out operations.Equipped with two-speed transmission: high speed for makeup, low speed for breakout, and high speed for final loosening. The power tong is driven by a hydraulic motor, which powers the dual gear set, intermediate gear and large gear. The hydraulic motor obtains pressure oil from the hydraulic station to output rotary torque for the bucking unit.
Main Parts of YNJX120 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
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 | Documents | 1 set | Includes QC certificate, warranty certificate, operation & maintenance manual, installation drawing, and e-drawing. |
III. Reference Images of YNJX120 Bucking Unit
1. Standard YNJX120/06 Bucking Unit
2. YNJX120/06 Plunger (Sucker Rod Pump) Bucking Unit
3. YNJX120/06 Sucker Rod Bucking Unit with Dual Power Tong and Friction Backup Tong
FAQ
Q1. What pipe sizes does the YNJX120 planetary clamping bucking unit handle?
A1. The YNJX120 planetary clamping bucking unit supports pipe O.D. 15.88–114mm (5/8" to 4-1/2"), covering oilfield tubing, sucker rod, sucker rod pump plunger, and pipe coupling.
Q2. What is the maximum torque of this tubing sucker rod bucking machine?
A2. It provides a maximum make-up and break-out torque of 6 kN·m (4,425 ft·lb) at high gear, and 2 kN·m (1,475 ft·lb) at low gear under 10MPa pressure.
Q3. What clamping technology does this API makeup breakout unit use?
A3. It adopts a planetary gear rotation mechanism with four-point simultaneous clamping, providing strong, reliable, and non-slip clamping force. The machine head clamps the coupling and is driven by a hydraulic motor to rotate.
Q4. What control modes does this hydraulic bucking machine support?
A4. It supports manual operation, automatic button control, and microcomputer automatic control via Siemens S7-1200 PLC with 15" industrial computer, freely selectable according to site demands.
Q5. What are the advantages of the clamping system?
A5. Four-point synchronous clamping ensures uniform, non-slip gripping without damaging threads. Optional non-marking dies are available for chrome and premium threads. Dual-speed operation allows torque adjustment for different applications.
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 solution, please contact us for detailed parameter and quotation.
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