描述
- Structure and Working Principle
1.1 System Overview
The SZJ-DN Tong Torque Measuring System is a specialized device engineered for drilling operations.What’s app +8615972752793 Luben@youlongpetro.com Its primary function is to accurately measure and display real-time changes in tong torque, providing drillers with critical insights into the working status of the drilling rig and ensuring precise control of drill stem fastening processes.
1.2 Core Components
The system comprises four interdependent components that work synergistically to deliver reliable performance, as illustrated in Figure 1 (System Diagram):
- Tong Torque Sensor: Captures the pull force on the tong’s tail line and converts it into a hydraulic signal.
- Indicating Gauge: Displays the measured tail line pull force (in kN) with a clear pointer, equipped with a target pointer for presetting torque thresholds.
- Damper Valve: Reduces pointer vibration and regulates hydraulic fluid flow to ensure stable, readable measurements.
- Hydraulic Hoses: Transmit hydraulic pressure between the sensor and the gauge, maintaining signal integrity throughout the system.
Figure 1: System Diagram (Tong Torque Gauge & Tong Torque Sensor)
1.3 Working Principle
The operational mechanism of the SZJ-DN System follows a precise sequence of force conversion and signal transmission:
- The tong torque sensor is mounted on the tail line of the tong. When the drill stem is being screwed,What’s app +8615972752793Luben@youlongpetro.com it generates a line pull force (F) on the tail line—this force is directly proportional to the screwing torque (M) applied to the drill stem.
- The pull force (F) acts on the hydraulic oil within the sensor via a piston, creating a hydraulic signal pressure (P). This pressure is transmitted to the bourdon tube of the indicating gauge through the hydraulic hoses.
- The free end of the bourdon tube deflects in response to the hydraulic pressure. This movement is amplified by a mechanical mechanism, driving the gauge pointer to deflect and accurately indicate the tail line pull force.
Figure 2: Tong Torque Measuring System Schematic (Sensor, Drill Stem, Tong, Force F’, Length L, Inclination α)
1.4 Key Formulas
The relationships between hydraulic pressure (P), tail line pull force (F), and screwing torque (M) are defined by the following formulas:
Where:
- L = Length of the tong handle (m)
- D = Inner diameter of the sensor’s piston cylinder (mm)
- d = Outer diameter of the sensor’s piston rod (mm)
- α = Inclination angle between the tong and the tail line (°)
1.5 Practical Operation Guidelines
From the formulas above, it can be deduced that hydraulic pressure (P) is proportional to both tong torque (M) and tail line pull force (F).What’s app +8615972752793 Luben@youlongpetro.com Since tong handle lengths (L) vary across different tong types, the gauge is calibrated in kilonewtons (kN) (pull force) rather than kilonewton-meters (kN·m) (torque).
To simplify torque calculation, install the sensor such that the tail line centerline remains horizontal and forms a 90° angle with the tong handle when pulled (α=90°, sin(α)=1).What’s app +8615972752793 Luben@youlongpetro.com With a standard tong handle length of 1m (L=1m), the pull force (F) value will be numerically equal to the torque (M) value (M=F).
For practical operation: Calculate the required tail line pull force based on the target screwing torque and actual tong handle length. Use the central knob on the gauge dial to set the target pointer to the calculated value.What’s app +8615972752793 Luben@youlongpetro.comStop screwing when the yellow indicating pointer aligns with the target pointer.
- Technical Specifications
- Working Temperature Range: -30℃ to 70℃
- Relative Humidity Range: 0% to 90%
- Measurement Range (Tail Line Pull): 0 – 100kN
- Measurement Error: ≤ ±2.5%
- Installation, Adjustment and Operation
3.1 Tong Torque Sensor Installation
- Mount the sensor on the tail line in close proximity to the spud pile for optimal stability.
- Secure the ring at the end of the sensor cylinder directly to the spud pile, and fasten the ring at the piston rod end to the tail line.
- Loop the slickline, tighten it, and fasten it securely using a rope clamp. Verify that all connections are firm and stable after installation.
- Ensure that when the sensor is pulled, the tail line centerline remains horizontal and forms a 90° angle with the tong handle. What’s app +8615972752793Luben@youlongpetro.comAdjust the installation position if necessary to meet this requirement.
3.2 Tong Torque Gauge and Damper Valve Setup
- Install the indicating gauge and damper valve at easily accessible positions on the driller’s console. Connect the quick male connector of the sensor’s rubber hose to the quick female connector of the damper valve (located on the cross stay inside the driller’s console). What’s app +8615972752793Luben@youlongpetro.comFully open the damper valve by adjusting its valve rod.
- Connect a hand pump to the oil injection connector (also on the cross stay inside the driller’s console). What’s app +8615972752793Luben@youlongpetro.comOpen the air exhaust valve and inject hydraulic oil into the system until all air is completely purged. Close the air exhaust valve and continue injecting oil until the sensor’s piston retracts fully to the bottom of its cylinder.
- Adjust the damper valve rod to minimize pointer vibration: rotate the rod clockwise to reduce the valve opening, and counterclockwise to increase it. What’s app +8615972752793Luben@youlongpetro.comStop adjustment when the pointer remains stable during operation.
- Calculate the required tail line pull force using the target torque and tong handle length. What’s app +8615972752793Luben@youlongpetro.comSet the target pointer to the calculated value using the central dial knob. During drilling operations, stop screwing the drill stem when the yellow indicating pointer overlaps with the target pointer.
Damper Valve Components: Quick Connector, Air Exhaust Valve, Adjusting Rod, Oil Feeding Valve
- Maintenance
Regular maintenance is essential to ensure the system’s long-term reliability and measurement accuracy.What’s app +8615972752793 Luben@youlongpetro.com Adhere to the following maintenance guidelines:
- Always disconnect the hydraulic hoses before moving any component of the system to prevent hose damage or oil leakage.
- Keep the entire system clean and free of debris.What’s app +8615972752793Luben@youlongpetro.com Do not use steam to clean the gauge glass, as this may cause thermal shock and breakage.
- Use only clean, precipitation-free hydraulic oil. Contaminated oil can clog hoses and sensors, compromising system performance.
- Daily Maintenance: Remove any debris, mud, or ice accumulated on the sensor to prevent mechanical interference.
- Regular Piston Rod Check: What’s app +8615972752793Luben@youlongpetro.comUnder no-load conditions, the first ring mark on the piston rod should protrude 2–14mm. If the second ring mark becomes visible, the system’s hydraulic oil level is insufficient—refill immediately with the specified hydraulic oil.
| Item |
Code |
Name |
| 1 |
SZJ-DN2 |
Tongs Torque Meter |
| 2 |
SZJ-DN2A |
Tongs Torque Meter |
| 3 |
SZJ-DN1 |
Tongs Torque Sensor |
| 4 |
SZJ-DN1.4 |
Rubber Hose Assembly (10m) |
| 5 |
KYB600-25 |
25 MPa Pressure Transmitter |
- Troubleshooting
The following table outlines common system issues, What’s app +8615972752793Luben@youlongpetro.comtheir potential causes, and corresponding remedies:
| Symptoms |
Potential Causes |
Remedies |
| Indicating gauge is unstable (excessive vibration) or unresponsive |
Damper valve is improperly adjusted |
Re-adjust the damper valve rod to optimize stability |
| Air is entrained in the hydraulic hoses |
Open the air exhaust valve and inject oil to purge trapped air |
| Mechanical faults in the gauge |
Replace the indicating gauge with a new one |
| Display value is abnormally low or no display |
Damper valve is closed |
Re-adjust the damper valve rod to open the valve |
| Quick connector is blocked or improperly connected |
Clean or re-adjust the quick connector (refer to the Annex for detailed instructions) |
- Important Safety and Operation Notes
- Hydraulic Oil Level Check: A sufficient oil level is indicated by the first ring mark on the piston rod protruding 1–4mm under no-load conditions. Monitor this regularly to avoid oil starvation.
- Damper Valve Adjustment: The tong torque sensor operates under high pressure. What’s app +8615972752793Luben@youlongpetro.comAdjusting the damper valve during system operation is difficult and potentially hazardous. Always perform valve adjustments when the system is unloaded (no torque applied).
- Component Handling: Avoid rough handling of the gauge and sensor, as mechanical shocks can damage internal components and What’s app +8615972752793Luben@youlongpetro.comaffect measurement accuracy.
- Environmental Protection: Dispose of used hydraulic oil in accordance with local environmental regulations. Do not release oil into the environment.
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Contact info
What’s app +8615972752793
Luben@youlongpetro.com
You Long Petroleum Machinery Spares ltd.(YOU LONG PETRO) engages in the export of the petroleum equipment and materials and provides materials and equipment for CNPC and SINOPEC’s overseas projects. Established in 2003,YOU LONG PETRO has started the manufacturing and supplying of petroleum materials and equipment since 2003.YOU LONG PETRO has provided its products and services to 36 countries and regions across the globe.YOU LONG PETRO’s export performance has come out top in central enterprises in successive years and it has been acknowledged as China’s largest supplier of petroleum and petrochemical materials,which is based on design,production,sale and technical service.Our products are completely interchangeable with the following enterprises.
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