HG/T 2647-1994 Technical requirements for length measuring machines for ordinary V-belts and narrow V-belts
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T 2647--94
General V-belt and Narrow V-belt Length Measuring Machine
Technical Conditions
Published on October 26, 1994
Ministry of Chemical Industry of the People's Republic of China
Implementation on March 1, 1995
Chemical Industry Standard of the People's Republic of China
Technical Conditions for General V-belt and Narrow V-belt Length Measuring Machine Subject Content and Scope of Application
HG/T2647--94
This standard specifies the basic structure, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of general V-belt and narrow V-belt length measuring machines (hereinafter referred to as length measuring machines). This standard applies to general V-belt and narrow V-belt length measuring machines for measuring the length and exposure height. √ Belt and narrow V-belt length measuring machine, 2 Reference standards
GB1184 Shape and position tolerances without tolerances GB1958 Shape and position tolerance detection regulations GB2611 General technical conditions for testing machines
GB11356 Groove inspection of pulleys for ordinary and narrow V-belt drives GB/T13575.1 Belt drive Ordinary V-belt drive GB/T13575.2 Belt drive Narrow V-belt drive
HG/T2382 General technical conditions for rubber testing instruments and equipment Basic structure
The length measuring machine (see Figure 1) includes two identical measuring pulleys installed on two parallel and equal-height horizontal axes, a mechanism for applying measuring force, a mechanism for measuring the center distance between the two pulleys, and a mechanism for measuring the exposed height. During measurement, one pulley is fixed and the other pulley can slide in the specified direction. The measuring force is applied to the V-belt to be measured through the sliding pulley. Note: When the pulley shaft is installed vertically, the V-belt to be measured should be properly engaged with the pulley groove. 6
Figure 1 Schematic diagram of V-belt length measuring machine
1—Center distance measuring mechanism; 2—Exposed height measuring mechanism: 3-Fixed pulley: 4-V-belt to be measured; 5—Sliding pulley; 6—Mechanism for applying measuring force Approved by the Ministry of Education and Industry on October 26, 1994 and implemented on March 1, 1995
2647-94
Benchmark width
Benchmark diameter
Benchmark width system for measuring pulley parameters and measuring force Table 1
Benchmark circumference
32.13-0.0
62.60-0.0
150.12%.6
199 .76-0.06bzxZ.net
234.62-0.06
592.62.66
99.76.0.0
149.13.8.06
198.29-0.06
6.24tg.03
10.06g.o3|| tt||13.31-g.03
16.95+0.03
22.53+g.03
32.32+g.03
38.28+8.03
9.91±.0m
12.96-9.03
16.45tg.0
22.35-0.03
32°±0.2 5
34°±0.25
33°±0.25 ° | | tt | |220±2.0N
300±3.0N||tt ||750±7.0N
1400±15.0N
1800±18.0N
300±3.0N
560±5.0N
900±9.0N
1500±16.0N
4 Technical requirements
HG/T2647—94
4.1 The normal working conditions of the length measuring machine shall comply with H G/T2382 regulations 4.2 The indication error of the pulley center distance measuring mechanism shall not exceed 1% of the measured V-belt reference length or effective length 4.3 The maximum allowable error of the V-belt exposed height measuring mechanism indication shall not exceed 0.15mm 4.4 The main parameters of the pulley measured by the reference width system are shown in Figure 2 and Table 1, and the main parameters of the pulley measured by the effective width system are shown in Figure 3 and Table 2.
Table 2 Pulley parameters and measuring force of effective width system mm
9N(3V)
15N(5V)
25N(8V)
Effective width
95.5±0.1
191.0±0.1
318.3±0.1
Effective circumference
Minimum depth
38°±0.25°
38°±0.25°
38± 0.25
Measuring force
445±4.5N
1000±10.0N
2225±22.0N
HG/T2647-94
4.5 The measuring forces of the reference width system and the effective width system are shown in Table 1 and Table 2 respectively. 4.6 The axes of the two measuring pulleys shall be parallel to each other, the symmetrical planes of the V-grooves of the two measuring pulleys shall coincide, and the deflection angle (see Figure 4) shall comply with the provisions of GB/T13575.1 and GB/T13575.2 Figure 4
4.7 The radial runout of the outer circumferential surface of the pulley and the end face runout of the pulley based on the center line of the pulley shaft shall comply with the provisions of GB1184 without tolerance values.
4.8 The basic requirements, appearance quality and electrical performance of the length measuring machine shall comply with the provisions of GB2611.4.9 The transportation bump performance of the length measuring machine shall comply with the provisions of HG/T2382. Test method
5.1 The test conditions shall comply with the provisions of Article 4.1.5.2 Test tools and instruments
8. Internal micrometer graduation value 0.01mm;
b. Standard gauge block grade 5;
c. Measuring accuracy of force measuring device 0.5%;
d. Dial indicator graduation value 0.01mm
e. Roughness standard comparison block.
HG/T2647-94
5.3 The indication error of the pulley center distance measuring mechanism is checked with an inside micrometer. Place the sliding pulley at any position on the guide rail and measure the axle distance between the two pulleys with an inside micrometer (the inside micrometer can be lengthened with an extension rod). Calculate the absolute value of the difference between the measured axle distance plus the sum of the radius of the two pulley shafts and the indication value of the pulley center distance measuring mechanism at this time. Measure three times according to the above method. The maximum value obtained should comply with the provisions of Article 4.2.
5.4 The indication error of the V-belt exposure height measuring mechanism is checked with a gauge block: Press the gauge block against the outer edge of the pulley so that the surface of the gauge block is perpendicular to the exposure height probe. Calculate the absolute value of the difference between the indication value of the exposure height measuring mechanism and the thickness of the gauge block at this time. Rotate the pulley and measure three times according to the above method at different positions. The maximum value obtained should comply with the provisions of Article 4.3. 5.5 The main parameters of the measuring pulley shall be inspected according to the relevant provisions of GB11356. The roughness shall be inspected with a roughness standard comparison block. The result shall comply with the provisions of Article 4.4.
5.6 The measuring force shall be inspected with a force measuring device. The two ends of the force sensor of the force measuring device shall be connected to the two measuring pulleys with a wire rope or other soft rope. The code weights corresponding to various specifications of V-belts shall be added to the base code disc respectively. The measured force value shall comply with the provisions of Article 4.5. N
5.7 The deflection angle of the symmetrical plane of the V-groove of the two measuring pulleys shall be measured with a dial indicator. The qualified pulley shall be installed on the pulley shaft and the sliding pulley shall be placed at any position of the guide rail. Make the dial indicator probe contact the end face of the pulley, and read the values at A1, A, A, A near the outer edges of the two pulleys (as shown in Figure 5) in sequence. The deflection angle, B, is calculated by formula (1).
Where: β, deflection angle,
(N2-N1
N1, N2, N, — readings of the dial indicator at A1, 42 and A in sequence, mm; distance between LAA2, mm; || tt||a--pulley center distance, mm;
d.--pulley outer diameter, mm.
The skew angle β, is calculated by formula (2)
where: β,-skew angle
(N2-N)
arctan
HG/T2647-94
N1, N2, N., N2--the dial indicator is at A,, A2, A.', A2\ readings, mm; L - distance between A1, A2, mm;
LA, distance between A2, mm.
Rotate the two pulleys, measure three times at different positions of the pulleys according to the above method, the maximum value of the results shall comply with the provisions of Article 4.6. The radial and end face round runout of the pulleys shall be measured according to the method specified in GB1958, and the results shall comply with the provisions of Article 4.7. 5.8
5.9 The basic requirements, appearance quality and electrical performance of the length measuring machine shall be inspected according to the relevant provisions of GB2611, and the results shall comply with the provisions of Article 4.8.
5.10 The transportation bump performance test of the length measuring machine shall be carried out according to the relevant provisions of HG/T2382, and its performance shall comply with the provisions of Article 4.9. 6 Inspection rules
Each length measuring machine shall be inspected and qualified by the quality inspection department of the manufacturer and accompanied by a product certificate before it can leave the factory. 6.1 The inspection of length measuring machines is divided into factory inspection and type inspection. Factory inspection is carried out according to the requirements of 4.2 to 4.6, and type inspection is carried out by sampling according to 4.2 to 4.8. 6.2 The length measuring machine shall be type inspected under the relevant circumstances specified in HG/T2382. 6.3 The sampling and judgment rules of type inspection shall be implemented in accordance with the relevant provisions of HG/T2382. 7 Marking, packaging, transportation and storage
The marking, packaging, transportation and storage of the length measuring machine shall comply with the relevant provisions of HG/T2382. 8 Random documents
The types and storage of random documents of the length measuring machine shall comply with the provisions of HG/T2382. Additional notes:
This standard is proposed by China National Chemical Equipment Corporation. This standard is under the jurisdiction of the Rubber Testing Instruments and Equipment Standardization Technical Committee of the Ministry of Chemical Industry. This standard was drafted by Qingdao Rubber Industry Research Institute, Qingdao Shinan District Thermal Machinery Factory, Yingkou Material Testing Machine Factory, Jiangdu County Material Testing Machinery Factory, and Harbin Institute of Technology. The main drafters of this standard are Qi Bin, Han Decanshen, Niu Zhongguang, Wang Yong, Li Hongxing, Yao Jianli, and Chen Tieming. Format
People's Republic of China
Chemical Industry Standard
Technical Conditions for Length Measuring Machines for Ordinary V-Belts and Narrow V-Belts HG/T2647-94
China National Chemical Equipment Corporation
100011
Ministry Code
Printing Beijing Institute of Chemical Technology Printing Factory
Copyright reserved
880×1230
First Edition in June 1995
No Printing
12,000 Words
First Printing in June 1995
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.