YJ/T 4-2011 in English
VALIDTest code for earthquake rescue equipment - Engine powered tools
- Issued on:2011-12-27
- Implemented on:-
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
| Standard No: | YJ/T 4-2011 |
| Document status: | VALID |
| Title in English: | Test code for earthquake rescue equipment - Engine powered tools |
| Title in Chinese: | 地震救援装备检测规程 内燃机动力工具 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2011-12-27 |
| Superseding: |
DB/T 44-2011 Test code for eartnquake rescue equipment. Engine powered tools
|
| ICS Classification: | 91.120.25-Seismic and vibration protection |
| Chinese Classification: | P15-Engineering seismic resistance |
| Related Topics: | Internal stress detection
Medium earthquake detection rescue Power tool detection Automatic vibration detection Internal stress detection earthquake relief Inspection procedures and vibration detection Vibration detection of compressor copper tube Earthquake International Relief |
本标准规定了内燃机动力救援工具的检测要求、检测内容、检测指标和检测方法，适用于地震抢险救援用破碎镐、链锯、无齿锯等内燃机动力工具的定期检测。
Introduction
Analysis of the core content of the standard
| Tool type | Key detection indicators | Allowance deviation | Test method |
|---|---|---|---|
| Internal combustion breaker | Impact energy, impact frequency | ±10%, ±2% | Stress wave analysis method (GB/T 5621) |
| Chain saw | Sawing efficiency, fuel consumption rate | Grading requirements according to displacement | Log cutting test (LY/T 1198) |
| Internal Combustion Toothless Saw | Speed Stability | ±5% | Non-contact Speed Measurement |
Technological Evolution and Standard Background
This standard was upgraded from DB/T 44-2011 to YJ/T 4-2011, and the responsible unit was adjusted to the Ministry of Emergency Management, which reflects the systematic process of earthquake rescue equipment management. The main technological breakthroughs include:
- Improved impact energy measurement accuracy: the use of dynamic strain gauges and waveform recorders, the error control is 15% better than the old standard
- Enhanced environmental adaptability: the working range of -40℃~40℃ is clarified to cover extreme rescue environments
- Quantification of fuel efficiency: a new chain saw fuel consumption rate indicator is added (35-90cm³ displacement corresponds to 30-100g/m²)
Detailed explanation of key detection methods
Impact energy detection of internal combustion breaker
According to the requirements of Appendix C of the standard, a special energy absorber (steel pipe + steel ball combination) is required to absorb the shock wave energy. During the test:
- 3 strain gauges are pasted along the axial direction of the needle bar (spacing ≥30mm)
- Stress waves are excited by a 450N spring hammer
- 25 continuous waveforms are collected to calculate the energy value
Typical case: Analysis of abnormal detection of a certain type of breaker
In a test in 2020, the measured impact energy deviation reached -12%, exceeding the standard limit. After investigation, it was found that the needle bar heat treatment process did not meet the standards, resulting in a decrease in the elastic modulus. After replacing the 40Cr alloy steel needle bar that meets the requirements of GB/T 5621, it passed the re-inspection.
Implementation suggestions
Test cycle management
It is recommended to establish a three-level detection mechanism:
| Test type | Period | Test content |
|---|---|---|
| Daily inspection | After each use | Appearance damage, starting performance |
| Regular inspection | 1 year | Basic performance indicators |
| Comprehensive inspection | 3 years or after overhaul | All standard requirements |
Handling common problems
When the chain saw cutting efficiency is not up to standard, the following should be checked first:
- Chain sharpness (the standard requires the height difference of saw teeth to be ≤0.2mm)
- Fuel mixture ratio (usually 25:1~50:1)
- Air filter blockage
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