HG/T 2439-1993 Technical Specifications for Falling Ball Rebound Tester HG/T2439-1993 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T 2439-93
Technical Conditions for Drop Ball Rebound Tester
Published on June 14, 1993
Implemented on January 1, 1994
Published by the Ministry of Chemical Industry of the People's Republic of China
Free Download of Standard Industry Data
1 Subject Content and Applicable Scope
Chemical Industry Standard of the People's Republic of China
Technical Conditions for Drop Ball Rebound Tester
HG/T2439-93
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of drop ball rebound tester. This standard is applicable to the drop ball rebound tester for measuring high porous elastic materials and vulcanized rubber rebound performance (drop ball rebound rate). (hereinafter referred to as the tester). 2 Reference standards
HG/T2382-92 General technical conditions for rubber testing instruments and equipment 3 Working principle and main structure
3.1 Working principle
3.1.1 The working principle of the measuring instrument is to make a steel ball of a given diameter and mass fall freely on the surface of the sample at a specified height and then rebound. The rebound rate of the falling ball of the sample is calculated through the measurement device. 3.1.2 Calculation formula of the rebound rate of the falling ball
R—Rebound rate, %;
EHimax
#×460 (or 500)×100%
-the maximum rebound height in the specified number of tests, mm; Himax
-the number of samples specified in the test method,
3.2 Main structure
The instrument is mainly composed of a machine base, a ball drop mechanism, a sample rack, a steel ball, a measuring device and a display, etc. 3.2.1 Machine base
3.2.1.1 The machine base should ensure that there will be no vibration, jumping or movement during the test. (1)
3.2.1.2 The machine base should be equipped with a horizontal adjustment mechanism to ensure that the steel ball passes through the center of the center hole of the measuring device when it falls vertically, and should be equipped with a horizontal display device or additional device. 3.2.2 Sample rack
3.2.2.1 Adjust the sample rack on which the sample is placed so that the falling steel ball falls accurately to the center of the sample rack and does not move. 3.2.2.2 The sample rack shall not generate additional force on the sample. 3.2.2.3 The height of the sample rack should be adjustable to ensure the height of the falling steel ball. 3.2.3 Measuring device
The installation of the measuring device should ensure that its center hole is coaxial with the guide hole for the steel ball to fall on the ball drop mechanism. Ministry of Chemical Industry of the People's Republic of China approved the standard on June 14, 1993 Technical Regulation Network ww.beposo.can Free download of relevant standards and industry materials 1994-01-01 implementation
4 Technical requirements
4.1 Normal working conditions of the measuring instrument
Ambient temperature 5~40℃;
Relative humidity less than 85%;
Horizontally installed on a solid foundation;
In a non-vibrating environment;
No corrosive media around:
2439--93
The fluctuation of the power supply voltage should not exceed ±10% of the rated voltage; f
. No direct sunlight, arc light and strong light 4.2 Relative error of indication
The relative error of indication of the measuring instrument should not exceed ±1.5%, 4.3 Ball drop height and corresponding steel ball specifications (see table) Ball drop height
(mm)
4.4 General requirements for measuring instruments
(mm)
The appearance quality, electrical performance and other requirements of the measuring instrument shall comply with the relevant provisions of HG/T2382. 4.5 Transport bump performance
The transport bump performance of the measuring instrument shall comply with the relevant provisions of HG/T2382. 5 Test method
5.1 Test conditions
The test shall be carried out under the conditions specified in Article 4.1 of this standard. 5.2 Test tools, measuring instruments and instruments
. Grade 3 industrial balance;
Vernier caliper with an accuracy of 0.02mm;
cSpecial coaxial detection round bar, ±0.5mm;d.Special 460±0.1mm or 500±0.1mm detection straight bar;e.Special vertical inspection device (used when the measuring instrument is not equipped with a horizontal display device):f.Special 300mm (25mm wide) steel ruler:More:Measurement device for measuring instrument accuracy with an accuracy better than 0.5%. 5.3 Inspection of steel ball specifications
5.3.1 The diameter of the steel ball shall meet the requirements of Article 4.3 when inspected with a vernier caliper, and 5.3.2 The mass of the steel ball shall meet the requirements of Article 4.3 when weighed with a balance. 5.4 Inspection of falling ball height
The falling height from the bottom of the steel ball to the upper surface of the sample measured with a special detection straight bar shall meet the requirements of Article 4.3. 5.3 Check the accuracy of the measuring instrument
5.5.1 Take three samples, measure three effective rebound height values ​​for each sample, and take out the maximum rebound height value of each sample. .2
Standard Technical Regulation Network ww.beposo,can Free download of various relevant standard industry materials 5.5.2 Calculate the rebound rate R according to formula (1). HG/T2439--93
5.5.3 Calculate the relative error g of the measuring instrument according to formula (2)
Where: g——relative error of the measuring instrument; R——ball rebound rate calculated according to formula (1); R, the measured ball rebound rate. bzxZ.net
The calculation result shall comply with Article 4.2,
5.6 General requirements inspection and transportation bump test of measuring instrument×100%
General requirements inspection and transportation bump test of measuring instrument shall be carried out in accordance with the relevant provisions of HG/T2382. 6 Inspection rules
Each measuring instrument must be inspected and qualified by the quality inspection department of the manufacturer and can only leave the factory with a product certificate. 6.1 The inspection of measuring instruments is divided into factory inspection and type inspection. Factory inspection is carried out on each instrument according to Articles 4.2 to 4.4. Type inspection shall be carried out by sampling inspection in accordance with Articles 4.2 to 4.5. 6.2 The measuring instrument shall be subjected to type inspection under the relevant circumstances specified in HG/T2382. 6.3 The sampling and judgment rules for type inspection shall be implemented in accordance with the relevant provisions of HG/T2382. 7 Marking, packaging, transportation, storage
The marking, packaging, transportation, storage, etc. of the measuring instrument shall comply with the relevant provisions of HG/T2382. 8 Random documents
The types and storage of the random documents of the measuring instrument shall comply with the relevant provisions of HG/T2382. Additional notes:
This standard was 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 Guangzhou Testing Instrument Factory. The main drafters of this standard are: Zhang Jinpei, Tan Jiezhen, and Li Xiangyang. bsBoso.com(2)
People's Republic of China
Chemical Industry Standard
Technical Specifications for Ball Rebound Tester
HG/T2439-93
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printed by Beijing Institute of Chemical Technology Printing Factory
Copyright reserved
880×1230
No reproduction
First edition in June 1994
.wm.bzsoso/ccmCustomer Standard Industry Data Free of Offline 0.5
7.5Handwriting
First printing in June 1994
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