Products Description
The YNJX400 Planetary Clamping Bucking Unit is a professional hydraulic bucking machine designed for precision make-up and break-out of oilfield casing, tubing, and downhole tools (such as packers and jars). It supports pipe O.D. 139–340mm (5‑1/2" to 13‑3/8") and delivers a maximum torque of 68 kN·m (50,154 ft·lb) at 25MPa. 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 casing downhole tools bucking machine provides high clamping force without slipping, and within the range of Φ139mm–Φ340mm, no die change is required. Optional non-marking dies are available for chrome and premium threads. Widely used in oilfield downhole tool assembly, casing and tubing production and repair lines. Custom solutions available.
Key Features & Specs
High Torque & API Compliance
Delivers up to 68 kN·m (50,154 ft·lb) maximum makeup torque at 25MPa pressure, suitable for large-diameter and high-strength threading applications. Meets API standards with reliable clamping and die marking.
3-Point Planetary Clamping System
Adopts planetary clamping structure with three-point synchronous clamping. Provides high clamping force without slipping, and within the range of Φ139mm–Φ340mm, no die change is required.
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-400 |
| Bore Diameter | Φ 400m (~Φ 15-3/4'') |
| Centre Height | 1000mm (Customizable, available for larger or smaller sizes) |
| Application | O.D. 139-340mm (Φ 5-1/2'' to 13-3/8'', Customizable for smaller sizes) |
| Speed Range | Rotation speed:1-10r/min |
| Make-up/Break-out Torque | Max. make-up/break-out torque: 50,154 ft.lb (68 kN.m) @ 25MPa pressure |
| Application Scenarios | Make-up, break-out tubulars including tubing, casings, and downhole tools or assemblies (thick-walled) |
| 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: 25MPa; Max. flow rate: 100L/min |
| Total Weight | Approx. 12T |
| Dimensions | Main machine: 4m × 1.7m × 1.6m (Length, Width, Height; Customizable, available for larger or smaller sizes) |
| Air Presure | 0.6-0.8MPa (Provided by user) |
| 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 68 kN.m to ft.lb is approximately 50,154 ft.lb.
I. YNJX400 Planetary Clamping Bucking Unit Structures and Features
The YNJX400/68 planetary clamping 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. The machine has features of large torque, large clamping force, reliability and no slipping, four clamping point and no need to change the teeth in ￠139mm-￠340mm.
YNJX-400/68 High-Torque Hydraulic Bucking Machine
The YNJX-400/68 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 for clamping and rotate the couplings of the workpiece. It is driven by hydraulic motor, the working principle is as following:
1) The speed change mechanism and gear transmission mechanism make the internal gear ring rotate, and the internal planet gear rotate to make the planetary claw clamp the coupling.
2) This kind of clamping structure has features of big torque, big clamping force, reliability and no slipping, three clamping point and no need to change the teeth in ￠139mm-￠340mm.
3) For large torque, all gears are weighted gear to increase the strength of the gear and make sure the strength and reliability of the bucking machine.
4) The friction tape braking of power tong has features of long service life, easy replacement, and low cost, etc.
Backup Tong Assembly
The backup tong is used to fix the pipe in working to make sure no pipe slipping. It is driven by cylinder. The backup trolly can move along the machine bed freely, which is driven by chain. A load sensor is equipped on the backup tong to record the working torque and send the information to computer,The PLC+industry computer can collect and manage data, control the bucking machine automatically. The advanced process control system provides dynamic display, torque & circle real time curves, historical data, and report printing in the order of day, month and group.
Main Parts of YNJX400 Planetary Clamping Bucking Machine:
1) Power Tong Assembly
2) Backup Tong Assembly
3) Electrical-hydraulic Control System
4) Control System (PLC + Upper Computer)
5) Pneumatic System
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 YNJX400 Bucking Unit
1. Standard YNJX400/68 Bucking Unit
2. YNJX400/68 Bucking Unit Exported to Thailand
FAQ
Q1. What pipe sizes does the YNJX400 planetary clamping bucking unit handle?
A1. The YNJX400 planetary clamping bucking unit supports pipe O.D. 139–340mm (5‑1/2" to 13‑3/8"), covering oilfield casing, tubing, and downhole tools. Within the range of Φ139mm–Φ340mm, no die change is required.
Q2. What is the maximum torque of this casing downhole tools bucking machine?
A2. It provides a maximum make-up and break-out torque of 68 kN·m (50,154 ft·lb) @ 25MPa pressure, suitable for large-diameter and high-strength threading applications.
Q3. What clamping technology does this API makeup breakout unit use?
A3. It adopts a planetary clamping structure with three-point synchronous clamping, providing high clamping force without slipping. Within the range of Φ139mm–Φ340mm, no die change is required.
Q4. What control modes does this hydraulic bucking machine support?
A4. It supports manual operation and automatic control via Siemens S7-1200 PLC with 15" industrial computer. The machine stops automatically when reaching the set torque.
Q5. What are the advantages of the clamping system?
A5. Three-point synchronous clamping provides high clamping force without slipping. Optional non-marking dies are available for chrome and premium threads. The split-structure design makes the hydraulic power unit separate for easy cleaning, noise reduction, and better cooling.
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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