GB/T 12736-2021 English PDFUS$184.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 12736-2021: Conveyor belts - Determination of strength of mechanical fastenings - Static test method Status: Valid GB/T 12736: Historical versions
Basic dataStandard ID: GB/T 12736-2021 (GB/T12736-2021)Description (Translated English): Conveyor belts - Determination of strength of mechanical fastenings - Static test method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G42 Word Count Estimation: 10,133 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 12736-2021: Conveyor belts - Determination of strength of mechanical fastenings - Static test method---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 - Determination of strength of mechanical fastenings - Static test method ICS 53.040.20 G42 National Standards of People's Republic of China Replace GB/T 12736-2009 Determination of the strength of mechanical joints of conveyor belts Static test method (ISO 1120.2012,MOD) Released on 2021-03-09 2021-10-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 12736-2009 "Static Test Method for the Determination of the Strength of Mechanical Joints of Conveyor Belts", and is in line with GB/T 12736-2009 Compared with.2009, the main technical changes are as follows. ---Updated normative references (see Chapter 2, Chapter 2 of the.2009 edition). This standard uses the redrafting method to amend and adopt ISO 1120.2012 "Determination of the static test method for the strength of mechanical joints of conveyor belts" law". Compared with ISO 1120.2012, there are technical differences between this standard, and the clauses related to these differences have been passed on the outer margins. The vertical single line (|) of the setting is marked, and the technical differences and their reasons are as follows. --- Regarding normative reference documents, this standard has made adjustments with technical differences to adapt to my country's technical conditions and adjustments. The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows. ● Replace ISO 283 with GB/T 3690 which is equivalent to the international standard (see 5.2, Chapter 8). This standard also made the following editorial changes. ---In accordance with the requirements of GB/T 1.1-2009, in the "Scope" chapter, "This standard applies to fabric core laminated conveyor belts and fabrics The mechanical joint of the whole core conveyor belt"; ---References are revised to Chinese documents. This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard is under the jurisdiction of the National Belt Wheel and Belt Standardization Technical Committee Conveyor Belt Subcommittee (SAC/TC428/SC1). Drafting organizations of this standard. Zhejiang Shuangjian Rubber Co., Ltd., Zhongnan Rubber Group Co., Ltd., Shandong Chenguang Adhesive Tape Co., Ltd. Company, Zhejiang Sanwei Rubber Products Co., Ltd., Shandong Xiangtong Rubber and Plastic Group Co., Ltd., Baoding Huayue Tape Co., Ltd., Qingdao Technology the University. The main drafters of this standard. Shen Huimin, Wang Chuangui, Liu Shengping, Wen Shoudong, Zhang Zhenyu, Cao Zengpu, Xin Yonglu, Xu Zhenzhu, Qiu Jinli. The previous versions of the standard replaced by this standard are as follows. ---GB/T 12736-1991, GB/T 12736-2009. Determination of the strength of mechanical joints of conveyor belts Static test method1 ScopeThis standard specifies the static test method for the strength of mechanical joints of conveyor belts. The joint can be connected with a connecting shaft or not Connect with connecting shaft. This standard does not involve vulcanized joints. This standard applies to the mechanical joints of fabric-core laminated conveyor belts and fabric-core conveyor belts. This standard does not apply to the light conveyor belt specified in GB/T 39825 [1]. Note. This standard specifies that the purpose of this test is to prevent insufficient strength of the static mechanical joints of the conveyor belt. The dynamic test method standards for the joints will be developed in the future.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 3690 Fabric core conveyor belt full thickness tensile strength, elongation at break and reference force elongation test method (GB/T 3690-2017, ISO 283.2015, IDT)3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Joint width widthoffastening The number of joint units is multiplied by the pitch, or the number of hooks is multiplied by the pitch (see Figure 1). 3.2 Pitch The distance from a point on a connecting unit or hook to the corresponding point on an adjacent unit or hook (see Figure 1).4 PrincipleContinuously increasing tensile force is applied to the specimen until the mechanical joint breaks and separates.5 equipment5.1 Metal adapter plate. used for the test of detachable (using connecting shaft) joints. 5.2 Tensile testing machine. meet the requirements of GB/T 3690.6 Sample6.1 Cutting the sample The sample should be taken at least 50mm away from the belt edge in a direction parallel to the longitudinal axis of the belt. 6.2 Shape size and preparation 6.2.1 Using mechanical joints connecting shafts The sample is a full-thickness belt cut along the longitudinal direction of the belt. The minimum length is 100mm plus the clamping length (see Figure 2), and the width is 150mm. Connect the sample to the mating board through a mechanical connector, and the width of the joint is not less than 100mm. 6.2.2 Do not use mechanical joints connecting shafts The sample is composed of two belts, the minimum length of each belt is 100mm plus the clamping length (see Figure 2), and the width is 150mm. will The two belts are connected by mechanical connectors, and the width of the joint is not less than 100mm. 6.2.3 Determination of the width of the total joint and the number of hooks The total joint width is not less than 100mm, and the number of hooks is determined by the following formula. 100 divided by the pitch is equal to the number of hooks, rounded to an integer slightly larger than this value. Total joint width. multiply the pitch by the number of hooks. Example. Hook pitch. 14mm. Then the number of hooks=100/14mm=7.1, rounded to 8. The total joint width=14mm×8=112mm. 6.3 Number of samples Take 3 samples for testing. 6.4 Condition adjustment and test conditions The test should be carried out at least 24h after the product is made, and this time includes the 8h required for state adjustment at the following specified temperature. a) Under general climatic conditions. (23±2)℃ or (20±2)℃; b) Under hot climate conditions. (27±2)℃. The test should be carried out at the same temperature as the condition adjustment, and neither the test nor the condition adjustment need to control the humidity. The temperature during the condition adjustment and the test shall be recorded in the test report. In the case of dispute, the time for state adjustment should be 72h.7 Test procedure7.1 Use of mechanical joints connecting shafts One end of the sample is clamped in the lower holder of the testing machine, and the other end is connected to the adapter plate. Connect the adapter plate to the upper holder of the testing machine (e.g. Shown in Figure 2). Apply a symmetrical tension to the specimen, that is, there should be no tendency for one end of the joint to break first. Separate the two clamps at a moving speed of (100±10) mm/min, and record the maximum tensile force when the joint is broken. 7.2 Do not use mechanical joints for connecting shafts Clamp the two specimens connected by mechanical joints into the upper and lower holders of the testing machine (as shown in Figure 2). Apply a symmetrical tension to the specimen, that is, no end of the joint should have a tendency to break first. Separate the two clamps at a moving speed of (100±10) mm/min, and record the maximum tensile force when the joint is broken.8 Results presentationCalculate the average value of the breaking force of the three specimens. a) The average value of the tensile strength of the joint, expressed in Newtons per millimeter of the joint width (see Figure 1 and Figure 2); b) Joint strength, expressed as a percentage of the average tensile strength of the joint to the nominal tensile strength of the full thickness (see GB/T 3690).9 Test reportThe test report should include the following. a) The name and number of this standard; b) Joint width; c) The brand and model of the connector; d) Conveyor belt brand and model; e) test results; f) Joint failure form. for example, indicating whether the belt is torn or the connector is disconnected; g) Condition adjustment and test temperature (see 6.4). ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 12736-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 12736-2021_English as soon as possible, and keep you informed of the progress. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 12736-2021?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 12736-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
