GB/T 7986-2025 English PDFGB/T 7986: Historical versions
Basic dataStandard ID: GB/T 7986-2025 (GB/T7986-2025)Description (Translated English): Conveyor belts - Drum friction testing Sector / Industry: National Standard (Recommended) Date of Implementation: 2026-03-01 Older Standard (superseded by this standard): GB/T 7986-2013 GB/T 7986-2013: Conveyor belts -- Drum friction testing---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Conveyor belts. Drum friction testing ICS 53.040.20 G42 National Standards of People's Republic of China Replacing GB/T 7986-1997 Conveyor roller friction test Issued on. 2013-06-09 2014-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordThis standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard replaces GB/T 7986-1997 "conveyor roller friction test methods", compared with the GB/T 7986-1997, Technical Changes are as follows. --- Increasing the normative references (see Chapter 2); --- Modified cylinder friction tester arrangement diagram (see Figure 1, 1997 edition of the FIG. 1); --- Modify the drum size (see Fig. 2, 1997 edition of the FIG. 2); --- Remove the tensioning lever schematic system (see Fig. 3, 1997); --- Increasing the specific requirements of the blower tube (see 4.4); --- Increase emergency braking device (see 4.6); --- Increasing the sample cut position (see Chapter 5); --- Modify the number of trials (see 6.2.1 and 622, 1997 edition 5.1 and 5.2.); --- Increased tension constant wind and no wind test test (see 6.2.3.1 and 6.2.4.1); --- Modified test procedure (see Chapter 6, Section 6 of the 1997 edition). The standard reference method using redrafted EN1554.1998 "conveyor roller friction test" (in English) prepared with EN1554. 1998 non-equivalent. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee pulley and the belt conveyor Technical Committee (SAC/TC428/SC1) centralized. This standard was drafted. Wuxi Bao Tong with Industry Co., Ltd., Zhejiang three-dimensional rubber products Co., Ltd., Changshu elephant Rubber Workers Co., Ltd., Wuxi Jin and Technology Co., Ltd., Qingdao Shinkansen Technology Consulting Co., Ltd., Qingdao University of Science and Technology. The main drafters of this standard. Wu Jianguo, Zhang Fang, Weng Guozhong, Wang Rongwei, Lvgui Qin, Li Cheng Cheng. This standard replaces the standards previously issued as follows. --- GB/T 7986-1987, GB/T 7986-1997.IntroductionThe purpose of this standard is to provide a test method to enable users to assess the conveyor degree of danger of the following hazardous situations. When the input Stop when the conveyor belt drive means in turn continue to run with the belt drive roller or other device so that local friction heat. About belt safety categories see EN12882. Conveyor roller friction test1 ScopeThis standard specifies a given stationary belt tension with the rotating steel cylinder with the friction caused by the possibility of an open flame and blazing of Test methods and changing the way the tension. This standard applies to conveyor roller friction test. Note. Some types of conveyor belts may be due to structural reasons not meet the requirements of 6.2.3, which can not be subjected to this test.2 Normative referencesThe following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 18404-2001 sheathed thermocouple cables and thermocouples (IEC 61515.1995, IDT) JB/T 6456-1992 YEJ series electromagnetic brake motors ISO 65 ISO 7-1 by turning the threaded steel pipe (Carbonsteeltubessuitableforscrewinginaccordance withISO 7-1) Principle 3 A section of the belt tension specimen mounted on a steel cylinder testing machine to bypass the middle of the drum sample, the sample subjected to a specified, mold Intends to stop the conveyor belt and the drum is rotated state test under tension specified certain time or until the specimen breaks. Record is No signs or appear open flame blazing, measured and recorded the highest temperature of the surface of the drum. Test in the absence of wind and/or windy conditions.4 deviceThe overall arrangement of the conveyor roller friction tester shown in Figure 1. 4.1 steel cylinder, an outer diameter (210 1 0) mm, mounted on the horizontal axis, and the test speed under various conditions of tension should be maintained (200 ± 5) r/min. Cylinder with 45 steel production, surface nitriding treatment. Its material is 45 steel shaft. Note. The test proved that the use of the most appropriate size of the motor drive power of 7.5kW ~ 15kW. Of course, the use of lower power is needed at the beginning. In order to regulate thermal performance of the drum, this standard specifies the basic dimensions shown in Figure 2. The difference between the diameter of the roller in the longitudinal direction shall not To 1mm. Although the drum diameter and wall thickness dimensions and tolerances are given in Figure 2, but allows the drum in the drum wall thickness due to the Test Abrasion minimized wall thickness of 6mm, diameter of the roller at this time should still be not less than 209mm. 4.2 cylinder temperature recording device includes a mineral insulated stainless steel sheathed thermocouple with a maximum outer diameter of 2mm, in line with GB/T 18404-2001 requirements. Thermocouples mounted on the inner wall of the drum in the longitudinal direction in the central of the measurement from the end surface of the outer cylinder Off should be less than 0.5mm. Note 1. It is recommended to install two or more thermocouples on the drum, used to prepare for the replacement thermocouple failure. Note 2. Note that the "cold end" compensation temperature or to its pre-measured out and be revised at the time of recording the results of the thermocouple is valid. Note 3. The test should be checked regularly in contact with the drum machine operation is normal. This can be determined by measuring the temperature of the drum testing machine at idle display values \u200b\u200bare And that did not change. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 7986-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 7986-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 7986-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 7986-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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