This standard specifies the model, specification, size, shape and weight, technical requirements, test methods, inspection rules, marking, quality certificate, packaging, transportation and storage of flexible joint socket-type cast iron pipes and fittings for building drainage. This standard is applicable to flexible joint socket-type cast iron pipes and fittings for building drainage. YC/T 178-2003 Determination method of whole and broken tobacco shreds YC/T178-2003 standard download decompression password: www.bzxz.net

The referenced appendices and appendices of this standard are normative appendices. This standard was proposed by the State Tobacco Administration and was drafted by the National Tobacco Standardization Technical Committee (TC144). The drafting units of this standard are: Zhengzhou Tobacco Research Institute, China Tobacco Standardization Research Center. The main authors of this standard are Liang Wei, Shen Xiajun, Zeng Bo, Xi Zhengsheng, Ma Ming, Luo Shanshan. YC/T178—2003
1 Standard drawing
Method for determining the whole and broken tobacco rate This standard specifies the method for determining the whole and broken tobacco rate This standard is used for tobacco, leaf tobacco, molded tobacco, recycled tobacco, reconstituted tobacco and other types of tobacco. 2 Normative referenced documents
YC/T178--2003
The clauses in the following documents become the clauses of this standard through general reference in this standard. The holes are dated referenced documents, and all attached complete documents (not including erroneous references) or complete versions are not applicable to this standard. However, the parties who have reached an agreement on this standard are encouraged to study whether the new versions of these documents are applicable. For all referenced documents without a date, the new versions are applicable: This standard, G/T5350.1 Industrial gold screen mesh, guide for the combination of mesh size and gold diameter of woven mesh, YT.8 Smoke physical properties, general part: water 3 Terms and definitions || tt || The following terms and definitions apply to this standard. 3.1
Solid cut rate
The ratio of the pure inertia of tobacco with a length greater than 2.50m to the total mass, expressed as a percentage. 3.2
Broken shred rate
The ratio of the total mass of tobacco with a length less than 13mm after being weighed, expressed as a percentage. 3. 3
Tobacco structure dynamic sorting sieve quality-eontrashnkar It is an instrument that uses three specifications of nets to separate tobacco into four sizes. 4 Testing principle
Using nets of different specifications, a certain mass of fine particles are separated according to the difference in length: the quality of the fine particles on the sieve is weighed: the ratio of the total mass of the sample taken is used to calculate the whole thread rate and the cut rate. 5-position equipment
E.1 Tobacco vibration sorting hoop
It is composed of three layers of screens and four tobacco collection boxes installed in a fixed frame and a conveyor belt, and is separated in reverse through three nets with different mesh sizes. The mesh size of the screen mesh is arranged in descending order. The mesh size of the mother layer screen mesh should be collected. The separated silk is collected. 1 is a schematic diagram of the dynamic separation tower screen. 1
YC/T17B-2003bzxz.net
Conveyor belt transmission parts:
Suction belt
Mesh size 3.35:0
Network size 2.5mm;
Connecting bar plate:
Connecting bar plate (4-)
5.2 Screen
1 Cigarette stick structure According to the dynamic separation screen diagram
5.2.1 The screen mesh at the end of the dynamic separation should comply with the provisions of G5/T5330.1. The end mesh specifications are given in Table 1. The plane installation diagram of the screen mesh is shown in Appendix A.
(u). 35X3. 55
rb: 2.5>2,50
Table tScreen specifications
5.2.2 The dynamic rate of the screen is (5+2)/mim
5.2.3 The thickness of the screen is (14.0±1.2) mm. The method for checking the screen is shown in the following table. 5.3 The average surface area of ​​the material belt is 1360mm±420mml. The maximum running speed is (.C16tm/m5.4 Toll box
Ensure the quality of the toll box.
5.5 The stability is 3.0 6 Sampling and sample handling YC/T178—2003 6.1 The products to be tested shall be randomly sampled from the warehouse of each relevant certification body: If there is a lack of effective control, the sampling rate shall be determined at the specified point. The sampling method shall be used for analysis: 6.2 The maximum sample pressure of the material to be tested is (1CC3.9120.0) g, and the sample quality shall be determined by the domestic plate car. The sample quality shall be recorded and used for cold testing: If the sample quality exceeds the specified range, the sample shall be used as a new sample. 6.3 The water content of the sample to be tested is 11.0%-14.0%, and the whole test shall be carried out according to YL/T 28.8. 7.2 Check the moisture content of the sample, ensure that it is clean, and correctly place the collection box at the corresponding position of each outlet. 7.3 If the quality of the new sample is less than 19,1, the original difference should be reduced according to the original difference. The sample should be spread on the slow material belt after the inclined belt runs a set distance. 0.2F. The sample is not expected to exceed the limit: (0.2F.) The excess sample should be spread on the slow material belt, and the upper auxiliary material should stop at 00. ... 7.4 Start the vibration first, start the sieve, and use the sieve to collect the single product. After the product is collected, it can be put into the corresponding collection box. 7.5 Weigh the collected products accurately, and record the quality of the collected products daily. 7.6 Check the quality of each layer of sieve. The quality of the collected silk should be consistent with the original sample quality = 1.6 pieces. If it exceeds the name, new sampling needs to be tried.
8 Expression of results
8.1 Whole silk rate
Formula (complement the calculation of the fractured silk rate, 3
YG/T17B—2003
- Whole silk rate
The mass of the detailed product on the 5mm and 2,55nm sieves, unit (): M The total mass of the product counted, single shock effect grams). 8.2 Broken silk rate
According to formula (2), the piece-counted silk machine is counted The calculated result is accurate to 1%. Ta
—accurate, is
m, and the mass of the sample received under the sieve is m-1,rn gram (g): M-the total mass of the received sample, unit is gram (). The test report should include the following contents: a standard label number; sample information: testing room, instruments and models used, control points! Check the water content of the sample,
Check the collection of steps,
Appendix A
(Normative record)
Screen plane arrangement
Side view of AI screen plane device
Top 550uen
1920 mm
Screen plane full scale top view
YC/178—2003
yC/T178—2003
(Normative appendix)
Method for detecting the vibration amplitude of the screen
The amplitude indicator is installed in the middle of the front of the screen. When the speed exceeds the limit, the circular mark on the indicator (see Figure B, 1) should be kept constant and the specification line and the indication quality should be consistent. Each time the specification is met. From the visual observation, it can be observed that when there are two wide and narrow shapes, the visual distribution of the two shapes is the same, the current amplitude value is not greater than the typical value. When the standard shape is separated, the current value is greater than the diameter number. If it is observed that the circular mark with a diameter of 11.0mm in the amplitude indicator is not tangent, it means that the current amplitude is 14.0nrrt: when the 12.8mm diameter circular mark appears to be separated and its 15.2mrr diameter mark appears to intersect, it means that the current amplitude is within (11.0±1.2)mm. If the 12.8mm diameter circular mark in the amplitude indicator intersects or the 15.2mm diameter mark appears to be separated, it means that the report is out of range and the solution should be checked and adjusted. 12.8mm
1.2 Routine inspection
Figure B.1 Amplitude index instrument
Before testing, check whether the old screen has any shape, and check whether the screen has any wear or cracks. If there is any sign of wear or cracks, the screen must be replaced according to the requirements of GH75331,1. Check whether the vibration of the screen is normal every 15 minutes.
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