JB/T 9008.2-2015 Electric wire rope hoists — Part 2: Testing method
1 Scope
This part of JB/T 9008 specifies the basic test requirements, as well as the test contents and methods of each test of electric wire rope hoists.
This part is applicable to electric wire rope hoists (hereinafter referred to as electric hoists) applying or swinging molten metal in general working environment, and it is adopted by making reference to electric hoists working in other environment.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1032-2012 Test procedures for three-phase induction motors
GB/T 4942.1-2006 Degrees of protection provided by the integral design of rotating electrical machines (IP code) - Classification
GB/T 5972 Cranes - Wire ropes - Care, maintenance, installation, examination and discard
GB/T 9239.1 Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state - Part 1: Specification and verification of balance tolerances
GB/T 9286 Paints and varnishes - Cross cut test for films
GB/T 10069.1 Measurement of airborne noise emitted by rotating electrical machines and the noise limits - Part 1: Method for the measurement of airborne noise emitted by rotating electrical machines
GB/T 22719.1 Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 1: Test methods
GB/T 22719.2 Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 2: Test limits
GB/T 30028 Energy efficiency test methods for electrical hoists
GB/T 29562.3 Energy efficiency test procedures of motors for crane - Part 3: Conical rotor 3-phase asynchronous motors
JB/T 9008.1 Electric wire rope hoists - Part 1: Types and basic parameter, specification
3 Basic requirements for test
3.1 In addition to the test methods specified in this part, other advanced and reliable test methods can be adopted.
3.2 The test power supply shall be consistent with the design power supply of electric wire rope hoists. The sinusoidal distortion rate of the voltage waveform shall not exceed 5%, and the difference between the frequency of test power supply and the rated frequency shall be within ± 1%.
3.3 Measuring instruments and tools shall be verified as qualified and within the validity period of verification. The selection of their accuracy grade and range shall be able to meet the technical requirements of the measured parts. The specific requirements are as follows:
a) The accuracy of voltmeter shall not be lower than Grade 0.5;
b) The accuracy of ammeter shall not be lower than Grade 0.5;
c) The accuracy of three-phase watt-meter shall not be lower than Grade 1;
d) The accuracy of transformer used in the measuring instrument shall not be lower than Grade 0.2.
e) The reading error of tachometer shall be within ±1 r/min, and the accuracy of digital tachometer and slip rate measuring instrument shall not be less than 0.1% ± 1 digit.
f) The accuracy of torque measuring instrument (including dynamometer and sensor) shall not be lower than Grade 0.5;
g) The accuracy of dynamometer shall not be lower than Grade 1.0;
h) The allowable deviation of thermometer is ±1℃;
i) The allowable deviation of test load is ±1%;
j) When the test instrument adopts a computerized automatic test system, the accuracy of electrical parameter instrument used shall not be lower than Grade 0.5.
k) The accuracy of sound level meter shall not be lower than Grade 2.
3.4 During the test, the following requirements shall be met:
a) Three-phase current shall be measured by current transformers and ammeters, and three-phase power shall be measured by two-watt meter method or a dedicated device.
b) The readings of all instruments shall be taken simultaneously. When measuring three-phase voltage or current, if all indicators are normal, the average value of three-phase readings shall be taken as the measured value.
Foreword III
1 Scope
2 Normative References
3 Basic requirements for test
4 Test contents and methods for electric hoists
4.1 General inspection
4.2 Insulation inspection
4.3 Grounding protection inspection
4.4 No-load test
4.5 Voltage reduction and increase tests
4.6 Measurement of braking glide amount
4.7 Measurement of hoisting and lowering speed
4.8 Measurement of hoisting mechanism noise
4.9 Current and voltage tests
4.10 Safety brake test
4.11 Static load test
4.12 Dynamic load test
4.13 Functional test for lifting capacity limiter
4.14 Operating mechanism test
4.15 Appearance coating quality
4.16 Energy efficiency test
4.17 Life test
5 Test content and methods of motor
5.1 General inspection
5.2 No-load test
5.3 Locked-rotor test
5.4 Withstand voltage test of winding against enclosure
5.5 Determination of static braking torque of motor
5.6 Noise measurement of motor
5.7 Interturn insulation test
5.8 Rotor dynamic balance test
5.9 Motor load test
5.10 Determination of maximum torque
5.11 Short-time overtorque test.
5.12 Determination for axial magnetic attraction force of cone-shaped rotor motor with no load
5.13 Thermal test (temperature rise)
5.14 Voltage rise and drop tests
5.15 Enclosure protection performance test
5.16 Energy efficiency test
Annex A (Normative) Number of cycles per hour, number of starts per hour, load duration rate, cycle period, operation mode, test load and total service life of motors at different working levels of hoisting mechanism
