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JJF 1867-2020: Calibration Specification for Cement Mortar Vibration Compaction Equipment
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JJF 1867-2020	English	349	Add to Cart	3 days [Need to translate]	Calibration Specification for Cement Mortar Vibration Compaction Equipment

JJF 1867-2020: Calibration Specification for Cement Mortar Vibration Compaction Equipment

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Calibration Specification for Cement Mortar Vibration Compaction Equipment National Metrology Technical Specifications of the People's Republic of China Calibration specification for cement mortar shaker 2020-09-11 released 2021-03-11 implementation Issued by the State Administration for Market Regulation Calibration specification for cement mortar shaker Replace JJG918-1996 Focal point. National Technical Committee of Vibration and Shock Speed Measurement Main drafting unit. Anhui Institute of Metrology Participated in the drafting unit. Henan Institute of Metrology Fujian Institute of Metrology Shanxi Institute of Metrology Guangdong Institute of Metrology This specification entrusts the National Technical Committee of Vibration and Shock Speed Measurement to be responsible for the interpretation The main drafters of this specification. Wu Anping (Anhui Institute of Metrology) Wang Qiang (Anhui Institute of Metrology) Lijun Huang (Anhui Institute of Metrology) Participating drafters. Liu Quanhong (Henan Institute of Metrology) Ma Xing (Fujian Institute of Metrology) Yuan Shufen (Shanxi Institute of Metrology) Huang Zhenjiang (Guangdong Institute of Metrology)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Overview (1) 4 Measurement characteristics (2) 4.1 Peak-to-peak vibration displacement (2) 4.2 Vibration frequency (2) 4.3 Vibration instability time (2) 4.4 Vibration time (2) 4.5 Braking time (2) 4.6 Uniformity of table displacement amplitude (2) 4.7 Basic dimensions of test cavity (2) 4.8 Quality of trial mode (2) 4.9 Funnel quality (2) 5 Calibration conditions (2) 5.1 Environmental conditions (2) 5.2 Standards and other equipment for calibration (2) 6 Calibration items and calibration methods (3) 6.1 Calibration items (3) 6.2 Calibration method (3) 7 Expression of calibration results (5) 7.1 Calibration data processing (5) 7.2 Evaluation of Uncertainty of Calibration Results (5) 7.3 Calibration certificate (5) 8 Recalibration interval (6) Appendix A Examples of Uncertainty Evaluation for Calibration of Vibration Displacement Peak-to-Peak Indication Error (7) Appendix B Calibration record format of cement mortar shaker (9) Appendix C The format of the inner page of the calibration certificate of cement mortar vibration table (10)

Introduction

JJF 1071 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001 "General Metrology Terms and Definitions", JJF 1059.1 "Evaluation and Expression of Measurement Uncertainty" together constitutes a basic series supporting the revision of this code specification. This code is based on GB/T 17671-1999 "Cement Mortar Strength Inspection Method (ISO Method)", JC/T 723- 2005 "Cement Mortar Shaking Table", JC/T 726-2005 "Cement Mortar Test Model" as the basis, the JJG918- 1996 "Cement Mortar Shaking Table" was revised. Compared with JJG918-1996, the main technology except for editorial modification The changes are as follows. ---Cement mortar vibration table verification procedures are changed to cement mortar vibration table calibration specifications; ---Added the basic structure of the shaking table and the schematic diagram of the mortar molding test (see Chapter 3); ---The peak-to-peak value of vibration displacement is changed to (0.75±0.02)mm (see 4.1); ---Added the requirements for vibration instability time after startup (see 4.3); ---The vibration time is changed to (120±2)s (see 4.4); ---The braking time is changed to not more than 5s (see 4.5); ---The basic dimensions of the trial cavity are changed to length. (160.0±0.8)mm, width. (40.0±0.2)mm, depth. (40.1±0.1)mm (see 4.7); ---Insulation performance requirements for the complete machine have been added (see 6.2.1); ---Increased the number of calibrations of vibration displacement peak-to-peak value, vibration frequency, and basic dimensions of the mold test cavity (see 6.2.2, 6.2.3, 6.2.8); ---Added the accelerometer installation location diagram (see 6.2.7); ---Added an example of the uncertainty evaluation of the calibration result of the peak-to-peak value of the vibration displacement (see Appendix A); --- Modified the format and content of the original records and calibration certificates (see Appendix B and Appendix C). The previous releases of this specification are as follows. ---JJG918-1996. Calibration specification for cement mortar shaker

1 Scope

This specification is applicable to cement mortar vibration tables for mortar molding according to the cement mortar strength inspection method (ISO method) Calibration.

2 Reference documents

This specification refers to the following documents. JJG974-2002 Cement softening equipment measuring instrument JJF 1156 Vibration impact speed measurement terms and definitions GB/T 17671-1999 Cement mortar strength inspection method (ISO method) JC/T 723-2005 cement mortar vibration table JC/T 726-2005 Cement mortar test mold For dated reference documents, only the dated version applies to this specification; for undated references The latest version (including all amendments) is applicable to this specification.

3 overview

The cement mortar vibration table (hereinafter referred to as the vibration table) is used to vibrate the cement mortar test body, and the cement mortar test body It is a professional equipment for fixed frequency, fixed amplitude, and timed vibration together with mold trial and blanking hopper. The vibration table consists of fixtures, table tops, It is composed of spring, motor, bias wheel and controller. The basic structure of the shaking table and the mortar molding test are shown in Figure 1.Vibrating table Test principle. The motor drives the eccentric wheel to rotate to reciprocate the table top to vibrate the cement mortar specimen in the test mold. Figure 1 The basic structure of the shaking table and the schematic diagram of the mortar molding test 1- clamp; 2- table; 3- spring; 4- motor; 5- bias wheel; 6-controller ...