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Inspection standards for Food mixer

2020-2-25

 
 
Inspection standards for Food mixer

A. Input power test:

1. With beater
①. Connect the test sample to AC230V / 50Hz power supply;
②. Beater should be as close as possible to the bottom of bowl. The bowl contains 170μm-250μm dry emery, and the height is about 80% of the effective length of the beater;
③. Read the data in the A / W / V table and record it.

2. With kneader
①. Connect the test sample to AC230V / 50Hz power supply;
②. Stir the dough, put kneaders in a bowl filled with a mixture of flour and water, and fill the bowl with 65% of the maximum capacity, adding 72g of water per 100g of flour at 25 ° C;
③. Read the data in the A / W / V table and record it.

3. With blender
①. Connect the test sample to AC230V / 50Hz power supply;
②. Beat carrots (the size of carrot is 15 × 15 × 15mm3 soak for 24hours). Put blender in a mixture of carrot and water, carrot: water = 2: 3, capacity is 1L (container is a round container with an inner diameter of 11㎝);
③. Read the data in the A / W / V table and record it.

B. Temperature test (Temperature rise of motor winding)

1. With beater:
①. Connect the test sample to AC244v / 50Hz or (AC216V / 50Hz) power (whichever is higher);
②. Test by resistance method: refer to the requirements of Input : test: meet W input ≥80% W rated power; operate for 15min (or the working time required by the instruction), work at low speed for 30sec, and then adjust to high speed
③. Read the data in the multimeter and record it;
④. Calculated temperature rise (motor coil) standard is: ≤95K (motor coil is Class B insulation).

2. With kneader
①. Connect the test sample
AC244v / 50Hz or (AC216V / 50Hz) power supply. (Whichever is higher)
②. Test by resistance method: refer to Input test requirements: meet W ≥ 80% of rated power; for hand-held mixer: work for 5minb. For desktop mixer: work for 10min first work at low speed for 30sec, and then adjust to high-speed gear or as required Speed ​​gear.
③. Read the data in the multimeter and record it.
④. Calculated temperature rise (motor coil) standard is: ≤95K (ClassB)

3. With blender
①. Connect the test sample to AC244V / 50Hz (or AC216V / 50Hz) power. (Whichever is higher)
②. Test by resistance method: refer to the requirements of Input test, meet W input ≥80% of rated power; work 5cycles: 1min "ON" / 1min "OFF"

③. Read the data in the multimeter and record it;
④. The standard for calculating temperature rise (motor coil) is: ≤95K (ClassB) (Note: when the normal load does not reach the indicated power 80%, then test at the indicated power. )

C. Abnormal operation test

Carry out motor stall test: lock the motor for 30sec and test the temperature of the coil with a spot thermometer, the standard is: ≤225 ° C (class B) Without protection

D. Withstand voltage test and leakage current test

Use a pressure tester and a leakage current tester to test various parts of the prototype, especially the gaps, holes, metal parts and knobs and buttons on the body that are easy to reach. Test standard: a.Hi-pot: 3750V / 10mA / 1min b. Leakage current: ≤0.25Ma

E. Impact test

Use a spring impact tester to perform the test. The test part: three impacts on the weak part of the casing, especially the air inlet and outlet (Note: the entire prototype is rigidly supported). The casing does not break.

F. Stability test

Place the prototype on an inclined surface with an inclination of 10 °.

G. Power cord tension test

①. Apply 25 times to the power cord for 1sec each time, and apply torque to the power cord for 1min.min
Claim:
a. The longitudinal displacement of the flexible cord does not exceed 2mm.
b. The displacement of the wire in the terminal does not exceed 1mm. The force requirements: (depending on the weight of the appliance)
② The power cord should not be damaged, and the creepage distance and clearance should not be lower than the standard of 29.①.

H. Finger test

1. Use the test finger (or test pin) to check whether the rotating parts have been touched, or test the air vents, air outlets, cover plates, and holes and slots that lead to charged bodies such as motors and switches to see if they are touched.

I. Life test


①. Connect the test sample: AC253V / 50Hz power supply; then: AC207V / 50Hz
②. Add normal load
③. Working system setting: 5min "ON" / 10min "OFF", cooling by fan (or according to customer requirements).
④. After the test is completed: perform a withstand voltage test and a leakage current test on the prototype; Hi-pot: 3750V / 1min / 10mA Leakage current: ≤0.25 mA
⑤ Disassembly inspection: whether the wear of each running part is abnormal;


J. Drop test

1. Drop the single prototype (with color box packaging) from a height of 76cm; (Requirement: one corner, three edges, six sides)
2. Packaging part: the damage of the prototype, including the damage of accessories;
3. The prototype was then tested for withstand voltage and leakage current; Standard: Hi-pot: 3750V / 1min / 10mA (leakage current: ≤0.25mA)
4. Whether the startup is normal;
5. Disassembly: See if the internal parts are damaged.
 

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