Inspection should be no corrosive gas, indoor temperature fluctuation is less than 2 ℃. Power supply voltage fluctuation range: 220+10-7v.
Test measuring instruments and auxiliary equipment.
A. stopwatch, the dividing value is not greater than 0.1 s;
B. vernier caliper, dividing value is not greater than 0.02 ㎜;
C. 0.3 standard dynamometer;
D.1g weight (4, etc.);
E. surface roughness comparison samples;
F. steel ruler, dividing value is not greater than 1 ㎜;
G a tape measure, dividing value is not greater than 1 ㎜;
I. the 40 mm? 40 mm? 160mm standard block;
J. Megohm meter, rated dc voltage 500v, accuracy not less than 2.5;
K. Rockwell hardness tester.
4.3 detection of 3.1 indicator value: using the 0.3-level standard dynamometer. When testing, start from 10% of the maximum load to the maximum load, measuring no less than 5 points, and measuring three times each.
Relative error and relative value for the calculation of degree of change, with bending machine based on scale, readings on the dynamometer, according to the following formula:.................................................................................... (1)........................................................................... (2)
Where: -- the relative error of the indicator value is %;
- the relative variation of the indicated value is %;
The process standard in the dynamometer certificate is N;
The arithmetic mean of the three readings in the process, the unit is N;
- the maximum value of the three readings in the process is N;
- the minimum value of the three readings in the process is N.
4.4 detection of 3.2 sensitivity: use 1g weight and steel plate ruler to detect the distance between the end point of the lever when the lever end is added with 1 gram weight, and the distance between the fulcrum and the endpoint is measured by the tape measure.
4.5 the detection of the loading speed of 3.3: the stopwatch is used for the calculation of three arithmetic mean values.
4.6 test of the column and support cylinder of 3.4.
4.6.1 test of the diameter of the column and the supporting column of 3.4.1 with a vernier caliper.
4.6.2 test of the effective length of the column and the supporting column of 3.4.2 with the vernier caliper.
4.6.3 detection of the center distance of the two supporting columns: the center distance of the two supporting columns is tested with the vernier caliper.
4.6.4 test of the parallelism of the two supported cylinders: the parallelism of the horizontal direction of the two supporting cylinders is measured by the vernier caliper, and the parallelism of the two supporting columns in the vertical direction is measured by the plug and 40mm. 40 mm? 160mm standard block for testing.
4.6.5 test of cylinder clearance: free rotation of the column and support cylinder with the hand, and no movement; The diameter of the cylinder is measured with a vernier caliper.
4.7 to 3.5 drive screw and the axial clearance of the swim mound of detection: the discharge downstream of the mound, with vernier caliper test drive screw diameter and swim on lead and drive screw with the inner diameter of the hole, the difference between the two is the axial clearance.
4.8 test for the hardness of the blade and knife: using the hardness tester.
4.9 for the roughness detection of the working surface of the clamping device: the surface roughness is used to compare the sample size.
4.10 test of insulation performance: megohm meter is used.
4.11 inspection of running status, ruler, horizontal mark and appearance of 3.9 ~ 3.12: visual inspection as required.