Products Description
The YNJQ120 Sucker Rod Bucking Unit is a professional hydraulic bucking machine designed for precision makeup and breakout of oilfield sucker rod, sucker rod pump, and downhole pump threaded connections. It supports sucker rod O.D. 16–110mm (5/8" to 4-3/8") and delivers a maximum torque of 6kN·m (4,425ft·lb) at high gear (2kN·m at low gear), customizable for higher torque. Equipped with Siemens S7‑1200 PLC and 15" industrial computer, it provides real-time torque and turn control. The power tong uses three synchronized hydraulic cylinders for clamping, and the backup tong uses a lead screw clamping mechanism, featuring dual-speed operation, PLC control, and optional non-marking dies. Widely used in sucker rod production, assembly and repair lines. Custom solutions available.
Key Features & Specs
Precision Torque Performance:
Max 6kN·m high gear / 2kN·m low gear torque, with ±2% control accuracy for reliable API-compliant connections.
Dual-Speed Operation:
Low gear 10–15r/min, high gear 15–30r/min, balancing speed and torque for diverse tasks.
Heavy-Duty Clamping:
3 synchronous hydraulic power tong cylinders + lead screw backup tong, non-slip, no-mark clamping.
Intelligent Control: PLC + industrial computer for real-time torque/turn monitoring, auto-stop at preset torque.
Equipment Parameters
| Specification | Value |
|---|---|
| Model | YNJQ-120 |
| Bore Diameter | Φ 120m (~Φ 4-3/4'') |
| Centre Height | 800mm (Customizable, available for larger or smaller sizes) |
| Application | O.D. 16-110mm (Φ 5/8'' to 4-3/8'') |
| Speed Range | Rotation speed: Low gear 10-15r/min, High gear 15-30r/min |
| Make-up/break-out Torque | Max. make-up/break-out torque: 4,425ft-lb (6kN.m)@High Gear, 1,475ft-lb (2kN.m) |
| Application Scenarios | Make-up and break-out of high-torque threaded connections of sucker rod and sucker rod pump/downhole pump |
| Torque Display | The computer can display, record and control the torque and turns |
| 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 | Power tong: 15-20MPa，backup tong :≤10MPa；Low noisy pump and high torque motor for lowering noise |
| Equipment Structure | Power tong: 3 clamping cylinders, 360°rotation Backup tong: hydraulic motor rotates lead screw driving claws clamping |
| 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% |
| Operation | Manually operation/Auto |
Note: The conversion for 6 kN.m to ft.lb is approximately 4,425 ft.lb.
I. YNJQ120 Sucker Rod Bucking Unit Structures and Features
The YNJQ120/06 bucking machine is a professional hydraulic bucking machine that adopts a different structure for power tong and backup tong. The power tong utilizes three synchronized hydraulic cylinders for clamping and continuous rotation to grip the coupling, while the backup tong uses hydraulic motor to rotate lead screw driving claws clamping for stable make-up and break-out.
The power tong of this sucker rod bucking unit is equipped with a 2-speed gearbox. The large gear connects to a cylinder frame fitted with three hydraulic cylinders evenly arranged at 120°. The rotating large gear drives the frame to make the cylinders clamp the coupling steadily. Curved jaw dies are replaceable for different pipe diameters, ensuring firm non-slip clamping without pipe damage or die marks. As a professional hydraulic bucking machine, its system pressure and make-up and breakout torque can be adjusted via the hydraulic station relief valve, and the power tong supports high/low speed shifting.
The backup tong clamps the threaded rod body to prevent rotation. It adopts a screw-driven clamping mechanism driven by a hydraulic motor to grip the square section of the sucker rod. The backup tong can move along guide rails to adjust the distance from the power tong. An optional dual-backup-tong structure avoids turning the sucker rod during make-up and breakout, greatly simplifying disassembly and assembly.
This design offers several key advantages: two-speed rotating, reliable and mark-free clamping, adjustable torque control, dual backup tong design, and real-time torque monitoring。
Main Parts of YNJQ120 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 YNJQ120 Bucking Unit
1. Standard YNJQ120/06 Sucker Rod Bucking Unit
2. YNJQ120/06 Sucker Rod Bucking Unit Image Set
FAQ
Q1. What sucker rod sizes does the YNJQ120 sucker rod bucking unit handle?
A1. It supports sucker rod O.D. 16–110mm (5/8" to 4-3/8"), covering common sucker rod and downhole pump sizes in oilfield applications.
Q2. What is the maximum torque of this oilfield sucker rod makeup machine?
A2. It provides a maximum makeup torque of 6kN·m (4,425ft·lb) at high gear, and 2kN·m (1,475ft·lb) at low gear, customizable for higher torque.
Q3. What clamping technology does this API sucker rod breakout equipment use?
A3. Power tong uses 3 synchronized hydraulic cylinders at 120° intervals for 360° rotation clamping. Backup tong uses lead screw mechanism driven by hydraulic motor to grip square section of sucker rod.
Q4. What control system does this hydraulic rod bucking machine use?
A4. It uses Siemens S7-1200 PLC with 15" industrial computer for auto/manual operation, torque-turn recording, and dual-speed control. The machine stops automatically when reaching the set torque.
Q5. What are the advantages of the clamping system?
A5. Three-cylinder power tong provides firm non-slip clamping without pipe damage or die marks. Optional dual-backup-tong structure avoids turning sucker rod during operation. Non-marking dies optional for premium threads.
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.
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