JJG 918-1996 Cement mortar vibrating table JJG918-1996 Standard download decompression password: www.bzxz.net
This regulation is applicable to the calibration of cement mortar vibrating tables that are newly manufactured, in use and after repair.

National Metrology Verification Regulation of the People's Republic of China JJG918—1996
Vibrator for Compacting Mortar Specimen1996 — 11 — 18 Issued
Implementation on 1997 — 05 — 01 Issued by the State Bureau of Technical Supervision
JJG 918—1996
Verification Regulation of Vihratorfor Compacting Mortar SpecimenJJG918—1996
This verification regulation was approved by the State Bureau of Technical Supervision on November 18, 1996, and came into effect on May 1, 1997.
Responsible unit:
National Vibration Seal Metrology Technical Committee
Drafting unit;
China Testing Technology Research Institute
China Measurement Science Research Institute
The technical provisions of this regulation shall be interpreted by the drafting unit. The main drafters of this regulation:
Deng Rongxin
Ma Mingde
Additional drafters:
Wang Changxiang
JJG918—1996
(National Institute of Testing Technology)
(National Institute of Metrology)
(Chaobei Institute of Metrology)
(China Testing Technology Research Institute)
Technical requirements
Verification conditions||tt| |Verification items and methods
Processing of verification results and verification cycle
JJG918—1996
Appendix 1 Format of verification certificate and verification conclusion notice (reprint) Appendix 2 Format of verification record
T.1G4181996
Verification procedure for cement mortar vibrating table
This procedure specifies the verification of newly manufactured, repaired and repaired water-jet vibrating tables: Overview
Cement mortar vibrating table (hereinafter referred to as vibrating table): It is a special device for calibrating cement test pieces with test molds and hoppers, and for calibrating caps and discharge hoppers. It is a new type of centrifugal vibrating table with two ends equipped with a centrifugal return end to excite the vibrator when it rotates: Technical requirements
1 The vibration table should be marked with the nameplate of the model, specification, factory, product number and manufacturing date. 1.2 The vibration table should be connected to the instruction manual for installation. 1.3 The vibration table surface and the fan surface of the test mold should be smooth and flat, and there should be no unevenness. 1.4 The surface can press the micro-material on the ground. 1.5 The movable system should be tight and there should be no slight vibration. 6 The electric control device must be well grounded.
2 The vibration frequency of the vibration table should be 46.750Hz, 2800~3000/mz3 When installing the empty test mold and the material bucket, the displacement of the vibration table should be 0.80-90r4 The continuous operation time of the vibration table should be 121 -1256+hold chain.1 After the operation time, the brake of the motor should be released within 37 seconds.
5 The maximum displacement amplitude within the test mold bottom area (245xm165mm) should not be less than 15%
6 A mold has 3 cavities, and the basic size of each cavity should be 1601m long, 40mm wide, and 40+0.mm high.
? The maximum pressure of the entire mold should be 6.-6.5ks. 8 The weight of the group is 22.5
Three test conditions
9 The air temperature is 5.-35:, the relative reading will not exceed 10%, and the change after power-on should not exceed 10% of the rated voltage. The vibration table should be kept clean, without any sand or other objects, and there is no pure gas in the room. 11
4. Verification items and methods
12 Use observation to carry out external inspection, the results should meet the requirements of article 1 of the regulations, 13 In the case of self-test and scientific research, the verification of the dynamic position signal can be carried out by one of the following methods: Use a frequency meter or a frequency meter with a frequency adjustment of no more than 1% to verify the accuracy of the calibration.
Use a 5-level rotary machine to test the motor's rotating ball vibration frequency. The frequency should be measured to the average value. The result meets the requirements of the second step of the current process: 14. Vibration displacement loss detection energy
141: Call the empty test mold to the specified position and install the thermal sensor on the position tube at the bottom of the model to align with the center of the table. 14.2. Put the material into the flow 4 effect: Imagine 1, connect the sensor output to the standard measurement protocol with a fixed accuracy of 3% (standard 45.55 Hz, the displacement measurement accuracy within the range of the product is not more than 1.5%! .3 The second quality is tight, the Kuka mold is full, and the value of the position cap is checked: the result should meet the requirements of the third code:
15 single talk continuous movement and the middle machine brake time. 15.1 Connect the power supply of the machine with the output cover (color is real). 2 Press the start button, and the question is whether the power is changed and the mountain (or red) is emitted. When the third sound is emitted, that is, the motor is braked or completed, the graduation value shall not be lower than .1 second, and the second and third sounds shall be less than 6 seconds! The instrument shall meet the requirements of the 4 items, and the values ​​of the instrument before the calibration are about 1 meter. In the case of an empty test hopper, use a dynamic measuring instrument to measure the displacement amplitude of the center point of the test surface and the non-closed test vehicle respectively, and the displacement values ​​can be calculated using the following formula: TAA
Wu Zhong: 12A1m4x
The maximum deviation (absolute value) of the displacement amplitude of each angular position relative to the center point position value: mm;
A--the displacement amplitude of the center point of the table, mm. The result meets the regulations The requirements of Article 5: 1? The new standard ruler with a graduation value of 0.02m is used to measure the entire length and height of each fastener, and the width can be measured along the length direction at both ends and the middle of the three positions: the measured structure should meet the requirements of Article 6 of the specification, 18 scientific case scales are used to verify the test mold, and the meter should meet the requirements of Article 1 of the existing program, JJG918-1996
19 Use a bench scale to verify the weight of the discharge funnel The results shall meet the requirements of Article 8 of the regulations. The processing of the verification results and the verification cycle of the five lists
2 The vibration table that meets the technical requirements of this regulation shall be issued a verification certificate: the vibration table that does not meet the technical requirements of this regulation shall be issued a verification result sheet:
Note: The verification cycle of the vibration table in use is 1 year.
22 Dynamic platform: During periodic verification, only 5 items of 12, 13, 14, 15, and 16 in the verification regulations are required: For the type verification and secondary verification (user acceptance), in addition to the above 5 items, 3 items of 17, 18, and 19 in the verification regulations are required.
Appendix 1
Vibration multi-stage/H
JJG918—1996
Verification certificate and verification result notice [back] format report dynamic position replacement Amplitude/ur, peak-to-peak value at point continuous vibration time/9
table surface static amplitude judgment degree/%
center negative drive to move the signal/mn, drop-to-peak
hospital mold cavity basic m
empty test mold vertical volume/kg
material hand volume/kr
Appendix 2
Instrument name
Inspected unit
Vibration standard rate/HzbZxz.net
J.1G 918—1996
Verification record format
Cement glue vibration table
Moving position scale value/num, a point peak-to-peak value continuous report or time
Table surface position barrel value uniformity/%
Four must have driven displacement amplitude/mm, peak-to-peak value test mold rate basic size/eam
Empty volume kk
Material leakage reset/g
Verifier:
Calibrator:
Production)
Product number
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