GB/T 34786-2017Grain and oil machinery - Toothed cracking rolls (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard proposed by the State Food Administration. This standard by the National Cereals and Oils Standardization Technical Committee (SAC/TC270) centralized. This standard was drafted unit. State Bureau of Grain Reserve Xi'an Oil Research Institute of Science. The main drafters of this standard. Li Wu Bao, Wei Bing, Liu Runmin. Grain and oil machinery roller crusher

1 Scope

China's national standard for toothed cracking rolls used in grain and oil processing. It specifies the terms and definitions, the working principle, the classification, the models and basic parameters, the technical requirements, the test methods, the inspection rules and the marking, packaging, transport and storage. A cracking roll is a pair of fluted cylinders turning towards each other at different speeds, and the difference in speed is the point: the faster roll drags the grain across the slower one, so the kernel is sheared open rather than crushed. In oilseed processing that is exactly what is wanted, because the object is to break the seed coat and open the cell structure without smearing the oil or generating fines that will blind the press. In milling the same geometry makes the first break rolls that open a wheat kernel and start the separation of endosperm from bran. The tooth profile, the differential speed and the roll gap are the three variables, and this standard fixes how they are described and measured.

This standard specifies the terms and definitions crusher, working principle, classification, model and basic parameters, technical requirements, test methods, inspection rules Then, labeling, packaging, shipping and storage requirements. This standard applies to roller crusher.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 191 Packaging - Pictorial signs

GB/T 3768 Acoustics sound pressure method for the determination of noise source sound power level above the reflective surface using envelope measurement of surface simple method

GB 5226.1 Safety of machinery - Electrical machinery and electrical equipment - Part 1. General specifications

GB/T 9239.1 mechanical vibration constant (rigid) rotor balance quality requirements - Part 1. Specification and balance of tolerance test

GB/T 9239.2 mechanical vibration constant (rigid) rotor balance quality requirements Part 2. Equilibrium error GB/T 13306 signs

GB/T 24854 General technical requirements for grain and oil mechanical product packaging

GB/T 24855 General technical requirements for grain and oil mechanical assembly General technical requirements for grain and oil machinery casting

GB/T 24856 General technical requirements for steel plate members of grain and oil mechanical plates GB/T 24857

GB/T 25218 General technical requirements for coating of grain and oil machinery products GBZ 158 Occupational hazards in the workplace warning labels JB2880 steel welding pressure vessel technical conditions

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Broken cracking, crushing Using a mechanical method, the entire pellet is extruded and cut into small pieces.

3.2 Powder degree finescontent The mass percentage of powder in the material.

3.3 Broken particle size particlesizeaftercracking Size and size of crushed oil after crushing.

3.4 Toothed roller crusher toothedcrackingrol With a pair of gear differential shear and squeeze the role of the oil crushing machinery.