NY/T 646-2002 Specification for quality evaluation of screw conveyors
Some standard content:
ICS65.060
Agricultural Industry Standard of the People's Republic of China
NY/T646—2002
Quality Appraising Standard for Screw Conveyor
Quality appraising standard for screw conveyer2002-12-30 Issued
2003-03-01 Implementation
Ministry of Agriculture of the People's Republic of China
This standard is proposed by the Agricultural Reclamation Bureau of the Ministry of Agriculture.
NY/T646—2002
Drafting units of this standard: Quality Supervision, Inspection and Testing Center for Drying Machinery and Equipment of the Ministry of Agriculture, Quality Supervision, Inspection and Testing Center for Agricultural Products Processing Machinery and Equipment of the Ministry of Agriculture.
Main drafters of this standard: Pan Jiujun, Xing Zuoqun, Gu Bingjie, Liang Zhonghua, Wang Peng, Jiang Xiufu, Wang Yanfeng. 1 Scope
Quality Appraising Standard for Screw Conveyor
This standard specifies the product quality indicators, test methods and inspection rules for screw conveyors. NY/T 646--2002
This standard applies to the product quality evaluation, test identification and product quality supervision and random inspection of mobile and fixed screw conveyors for horizontal, inclined and vertical continuous and uniform conveying of grain, seeds, loose materials and granular materials. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions shall apply to this standard. GB/T985 Basic forms and dimensions of weld grooves for gas welding, manual arc welding and gas shielded welding GB/T2828-1987 Sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches) GB/T3768-1996 Acoustics, sound pressure method for determining sound power level of noise source Simple method using envelope measurement surface above reflecting surface GB/T4064 Guidelines for safety design of electrical equipment GB/T8170--1987 Rules for rounding off numbers
GB 9969. 1-1998
GB 10395. 1--2001
General provisions for instructions for use of industrial products
Safety technical requirements for agricultural and forestry tractors and machinery Part 1: General provisions GB10396--1999 General provisions for safety signs and hazard graphics for agricultural and forestry tractors and machinery, lawn and gardening power machinery
JB/T 5673--1991
JB/T 7679-—1995
3 Quality indicators
3.1 Operating performance
General technical conditions for painting agricultural and forestry tractors and machinery Screw conveyor
The main operating performance of the screw conveyor shall comply with the requirements of Table 1. Table 1 Performance indicators
Productivity/(t/h)
Other working conditions
Vertical conveying
Unit power consumption/LkW·h/(t·m)］Broken rate increase/(%)
Brown rice rate increase (paddy)/(%)
Noise/dB(A)
Reliability effectiveness/(%)
Bearing temperature rise/℃
≥Enterprise standard (or design) value
≥Enterprise standard (or design) value
≤Enterprise standard (or design) value
NY/T 646—2002
Paint film thickness/μm
Paint film adhesion
Appearance of paint
Table 1 (continued)
Allow 2 places for level 2, 1 place for level 3
Even color, smooth and flat, no exposed bottom, no more than 2 flow marks, each flow mark does not exceed 50mm
Note: The productivity and unit power consumption indicators are based on the transportation of wheat, calculated according to capacity = 0.75t/m. 3.2 Idle running performance
3.2.1 It should run smoothly during idling, the spiral blades should not rub against the shell, there should be no jamming, and no abnormal noise. 3.2.2 The bearing parts should be sealed reliably without oil leakage. 3.3 Conveying spiral
3.3.1 Spiral blades
Spiral blades are divided into left-handed and right-handed. The feeding end can be made of single spiral blade, double spiral blade and three spiral blade according to the material requirements. 3.3.1.1
Spiral blades are manufactured by rolling, cold extrusion, molding and stamping. 3.3.1.2
3.3.1.3 The spiral blade should be integral or welded from several parts. 3.3.1.4 The thickness of the spiral blade should meet the requirements of Table 2. Table 2 Friction of spiral blades
Nominal spiral diameter/mm
Thickness of spiral blade/mm
3.3.2 Spiral blade shaft
3.0～3.5
4.0～5.0
The spiral blade shaft is made of medium and low carbon steel round steel or cold drawn round steel, seamless steel pipe and straight seam electric welded steel pipe. The shaft with a length of <2m and a diameter of <38mm should be made of round steel or cold-drawn round steel. The shaft with a length of ≥2m and a diameter of ≥38mm should be made of seamless steel pipe and straight seam electric welded steel pipe.
3.3.3 Conveying spiral
3.3.3.1 The spiral blades should be welded on the shaft with intermittent welds. The welds should be welded on one side of the non-working surface or on both sides in a staggered distribution. The end face of the spiral blade should be welded on both sides. The size and number of welds should comply with the provisions of the product drawings and technical requirements. 3.3.3.2 The local gap between the spiral blade and the shaft is ≤2mm. 3.3.3.3 The spiral blade should be perpendicular to the axis, and its angle limit deviation is ≤7°. 3.3.3.4 The nominal diameter, outer diameter tolerance, pitch and pitch tolerance of the conveying spiral and the gap between the outer diameter and the trough should all comply with the provisions of JB/T7679.
3.4 Conveyor housing
The outer surface straightness of the conveyor housing is 1/1000, and the outer diameter roundness or line profile is ≤2mm. The outer surface of the housing should be smooth, and the concave deformation should be ≤2 mm.
3.5 Safety
3.5.1 Electrical equipment should be safe and reliable, and its safety technical requirements should comply with the provisions of GB/T4064. The protection level of the motor and electronic control device on the machine body is: IP54 indoors and IP55 outdoors. The drive motor in the dust area should be a YFB type explosion-proof motor with a DIP mark, and the electrical insulation resistance should be ≥1MQ.
3.5.2 The exposed rotating parts should have protective devices, which should comply with the provisions of GB10395.1. 3.5.3 There should be safety warning signs in obvious positions for parts that are dangerous to operators. The signs should comply with the provisions of GB10369. 2
3.5.4 The lifting device of the mobile screw conveyor should be safe, reliable and easy to adjust. 3.5.5 The product manual should specify the precautions for safe operation. 3.6 Assembly quality
3.6.1 The assembly parts should be firmly connected.
3.6.2 The door should be adjustable and equipped with a locking device. 3.6.3 The drive device should not be disassembled when disassembling the screw. 3.6.4 The conveying screw should not be disassembled when disassembling the intermediate bearing. 3.6.5 The intermediate bearing should have a lubrication port or a lubrication nozzle. 3.6.6 The grounding surface of the mobile screw conveyor's travel wheel should be made of buffering and wear-resistant materials. 3.7 Welding quality
NY/T 646—2002
The welding quality should comply with the provisions of GB/T985. The weld should be even and firm, and should not have defects such as cracks, pores, slag inclusions, leaking welds, burn-throughs and false welds.
3.8 Instruction manual
3.8.1 The manual should be easy to understand and should be accompanied by drawings where necessary. 3.8.2 The format and content of the manual should comply with the provisions of GB9969.1. And there should be product "three guarantees" and quality assurance content. 3.9 Marking, packaging, transportation and storage
3.9.1 Each screw conveyor should be equipped with a fixed metal nameplate in a conspicuous position, and its content should include: a)
Product name and model;
b) Main technical parameters of the product;
Manufacturing date and product number;
d) Manufacturer's name and address.
3.9.2 Product packaging, transportation and storage should meet the following requirements: Ensure that the product is intact during transportation and storage, with no scratches on the surface, paint film shedding, extrusion deformation, etc. a)
The drive motor should be packaged separately and have protective measures. The conveyor body for segmented transportation should be tied and fixed firmly. c)
The accompanying technical documents including product certificates, operating instructions and packing lists or accessories should be packed or fixed on the screw conveyor body.
e) When storing, there should be good ventilation and moisture-proof conditions. If stored outdoors, there should be measures to prevent rain and sun exposure. 4 Test methods
4.1 Performance test
4.1.1 Test purpose
To assess whether the performance and technical and economic indicators of the prototype meet the design requirements and quality indicators. 4.1.2 Sampling method
4.1.2.1 The sampling method shall comply with the provisions of GB/T2828. 4.1.2.2 Random sampling shall be conducted among the products produced by the production unit in the past 12 months. The number of samples shall be 2. When the test is subject to conditions, the number of samples can be temporarily negotiated and determined, but the judgment principle remains unchanged. 4.1.2.3
4.1.2.4 Fill in the sampling form as required.
4.1.3 Test requirements
4.1.3.1 The performance test shall not be less than 3 times, and the interval between each test shall be ≥30min. 4.1.3.2 The main technical parameters of the prototype shall be measured before the performance test. 4.1.4 Test conditions
4.1.4.1 The test sample should be installed according to the instructions and adjusted to normal working state. 3
NY/T 646—2002
4.1.4.2 The feeding amount during the test should be controlled within the range required to achieve the rated productivity. 4.1.4.3 The test material should be one of the materials conveyed by the screw conveyor during normal operation. 4.1.4.4 When the test material is grain, its moisture content is <20% and the impurity content is ≤5%. 4. 1. 4. 5
The test instruments and meters should be qualified. The main measurement parameters and accuracy requirements should comply with the provisions of Table 3. Table 3 Accuracy requirements for measurement parameters
Measurement parameters
Weighing of test materials
Weighing of sample processing
Weighing of moisture content
4.1.4.6 The processing and rounding of test data shall comply with the provisions of GB/T8170. 4.1.5 Test content and method
4.1.5.1 Idle running test
Check each item according to the requirements of 3.2 of this standard, and measure the noise and observe the idle running performance. 4.1.5.2 Bearing temperature rise measurement
Accuracy
±0.5 s/d
According to conventional requirements
After idling for 30 minutes, immediately measure the temperature rise of the bearing and motor with a temperature measuring instrument that can reach the bearing part. 4.1.5.3 Noise measurement
Under the no-load state, measure at different positions around the prototype, 1m away from the prototype surface and 1.5m above the ground. The measurement points should not be less than 5. The test method and data processing should comply with the provisions of GB/T3768. 4.1.5.4 Productivity measurement
4.1.5.4.1 After the no-load operation is normal, put the material into full-load operation and maintain a stable state. 4.1.5.4.2 The test time is not less than 30min. Record the start and end time of the test, the material lifting height and the total mass of the material at the machine outlet. Calculate the productivity according to formula (1). In the formula:
Q is the productivity, in tons per hour (t/h); Q= 3.6
(1))
G is the total mass of the material during the measurement time, in kilograms (kg); T is the measurement time, in seconds (s).
4.1.5.5 Determination of unit power consumption
4.1.5.5.1 While measuring the productivity, test the electric power value (current and voltage, etc.), and record the screw conveyor inclination angle and the conveying length of the screw conveyor during the test.
4.1.5.5.2 The unit power consumption is expressed as the amount of power consumed to convey 1 t of material for a distance of 1 m. Calculate according to formula (2). A
P= G(Leosβ+2Lsing)
Where:
Unit power consumption, in kilowatt-hours per ton-meter [kW·h/t·m)]; A——actual power consumption, in kilowatt-hours (kW·h); L
-screw conveyor length, in meters (m); β—conveyor inclination angle, in degrees (°); G
actual conveying mass, in tons (t).
·（2）
4.1.5.6 Reliability
Reliability validity is calculated according to formula (3):
Where:
K= 2T+2T
K is reliability validity, in percentage (%); Tz is the operation time per shift, in hours (h); T is the failure time per shift (including the time for troubleshooting), in hours (h). 4.1.5.7 Determination of breakage rate increment
4.1.5.7.1 After the test begins, take samples every 5 minutes, for a total of 3 times, and each sample weighs about 0.5kg. 4.1.5.7.2 Inspect the grain samples according to the relevant grain inspection standards. 4.1.5.8 Determination of the value-added rate of brown rice in rice
NY/T 646—2002
(3)
Take 50g of rice from each sample before and after transportation, select and weigh the hulled rice grains at room temperature, and calculate the value-added rate of brown rice.
4.1.5.9 Inspection of paint quality
Test the adhesion of the paint film according to the requirements of JB/T5673, measure the thickness of the paint film with a coating thickness gauge, and check the appearance quality of the paint with a ruler and visual inspection.
4.1.5.10 Inspection of conveying screw
Inspect each item according to the requirements of 3.3 of this standard, and use a micrometer to detect the thickness of the spiral blade (the thickness of the spiral blade formed by rolling shall be measured at 1/5 of the blade width from the shaft surface).
4.1.5.11 Shell inspection
Inspect item by item according to the requirements of 3.4 of this standard, and use a steel ruler with a length of 1m to check the straightness and concave deformation of the shell surface. 4.1.5.12 Safety inspection
Inspect item by item according to the requirements of 3.5 of this standard, and use a megohmmeter to measure the insulation resistance. 4.1.5.13 Assembly quality inspection
Inspect the assembly quality item by item according to the requirements of 3.6 of this standard. 4.1.5.14 Welding quality inspection
Inspect the welding quality item by item according to the requirements of 3.7 of this standard. 4.1.5.15 Instruction manual review
Inspect the instruction manual item by item according to the requirements of 3.8 of this standard. 4.1.5.16 Marking, packaging, transportation and storage Inspect the markings and labels item by item according to the requirements of 3.9 of this standard. 5 Inspection rules
5.1 Classification of unqualified items
All items tested that do not meet the requirements of Chapter 4 of this standard are considered unqualified. They are divided into three categories: A, B, and C according to the degree of impact on product quality. The classification of unqualified items is shown in Table 4.
5.2 Judgment principles
5.2.1 The sampling judgment plan is shown in Table 5. In the table, AQL is the qualified quality level, A. is the qualified judgment number, and R. is the unqualified judgment number. 5.2.2 The principle of item-by-item assessment and category-by-category judgment is adopted. When the number of unqualified items in each category is less than or equal to the qualified judgment number A., the batch is judged to be qualified; when the number of unqualified items in one category is greater than or equal to the unqualified judgment number R., the batch is judged to be unqualified. 5
NY/T 646—2002
Classification of non-conforming products
Sampling plan
Qualified products
Productivity
Increase in broken rate
Increase in brown rice rate (paddy)
Safety
Instruction manual review
Unit power consumption
Reliability and effectiveness
Conveying screw
Bearing temperature rise
Welding quality||t t||Film thickness
Film adhesion
Appearance of paint
Idle running performance
Assembly quality
Table 4 Unqualified classification
Lifting and entry adjustment device Flexible reliability sign
Table 5 Sampling judgment plan
Unqualified classification
Sample size (n)
Number of items
Inspection level
Sample code2 The feeding amount during the test should be controlled within the range required to meet the rated productivity. 4.1.4.3 The test material should be one of the materials conveyed by the screw conveyor during normal operation. 4.1.4.4 When the test material is grain, its moisture content is <20% and the impurity content is ≤5%. 4. 1. 4. 5
The test instruments and meters should be qualified. The main measurement parameters and accuracy requirements should comply with the provisions of Table 3. Table 3 Measurement parameter accuracy requirements
Measurement parameters
Test material weighing
Sample processing weighing
Measurement moisture content weighing
4.1.4.6 Test data processing and rounding should comply with the provisions of GB/T8170. 4.1.5 Test content and methods
4.1.5.1 Idle operation test
Check each item according to the requirements of 3.2 of this standard, measure the noise, and observe the idle operation performance. 4.1.5.2 Bearing temperature rise measurement
Accuracy
±0.5 s/d
According to conventional requirements
After idling for 30 minutes, immediately measure the bearing and motor temperature rise with a temperature measuring instrument that can touch the bearing. 4.1.5.3 Noise measurement
Under idling state, measure at different positions around the prototype at a distance of 1m from the prototype surface and 1.5m above the ground. The measuring points should not be less than 5. The test method and data processing should comply with the provisions of GB/T3768. 4.1.5.4 Productivity measurement
4.1.5.4.1 After the idling operation is normal, put the material into full load operation and maintain a stable state. 4.1.5.4.2 The test time shall not be less than 30 minutes. Record the start and end time of the test, the material lifting height and the total mass of the material at the machine outlet. Calculate the productivity according to formula (1). Where:
Q is the production rate, in tons per hour (t/h); Q= 3.6
(1))
G is the total mass of the material during the measurement time, in kilograms (kg); T is the measurement time, in seconds (s).
4.1.5.5 Determination of unit power consumption
4.1.5.5.1 While measuring the production rate, test the electric power value (current and voltage, etc.), and record the screw conveyor inclination angle and the conveying length of the screw conveyor during the test.
4.1.5.5.2 The unit power consumption is expressed as the power consumed to transport 1t of material for a distance of 1m. Calculate according to formula (2). A
P= G(Leosβ+2Lsing)
Wherein:
Unit power consumption, in kilowatt-hours per ton-meter [kW·h/t·m)]; A——actual power consumption, in kilowatt-hours (kW·h); L
-screw conveyor length, in meters (m); β—conveyor inclination, in degrees (°); G
actual conveying mass, in tons (t).
·（2）
4.1.5.6 Reliability
Reliability effectiveness is calculated according to formula (3):
Wherein:
K= 2T+2T
K——Reliability effectiveness, in percentage (%); Tz—operating time per shift, in hours (h); T. Failure time per shift (including troubleshooting time), in hours (h). 4.1.5.7 Determination of the increase in the value of the broken rate
4.1.5.7.1 After the test begins, take samples every 5 minutes for a total of 3 times. Each sample weighs about 0.5kg. 4.1.5.7.2 Inspect the grain samples according to the relevant grain inspection standards. 4.1.5.8 Determination of the increase in the value of the brown rice rate of paddy
NY/T 646—2002
(3)
Take 50g of paddy from each sample before and after transportation, select the dehulled rice grains at room temperature and weigh them, and calculate the increase in the value of the brown rice rate.
4.1.5.9 Inspection of paint quality
Test the adhesion of the paint film according to the requirements of JB/T5673, measure the thickness of the paint film with a coating thickness gauge, and inspect the appearance quality of the paint with a ruler and visual inspection.
4.1.5.10 Inspection of conveyor screw
Inspect each item according to the requirements of 3.3 of this standard, and use a micrometer to measure the thickness of the spiral blade (the thickness of the rolled spiral blade is measured at 1/5 of the blade width from the shaft surface).
4.1.5.11 Inspection of shell
Inspect each item according to the requirements of 3.4 of this standard, and use a steel ruler with a length of 1m to detect the straightness and concave deformation of the shell surface. 4.1.5.12 Safety inspection
Inspect each item according to the requirements of 3.5 of this standard, and use a megohmmeter to measure the insulation resistance. 4.1.5.13 Assembly quality inspection
Inspect the assembly quality item by item according to the requirements of 3.6 of this standard. 4.1.5.14 Welding quality inspection
Inspect the welding quality item by item according to the requirements of 3.7 of this standard. 4.1.5.15 Instruction Manual Review
Inspect the instruction manual item by item according to the requirements of 3.8 of this standard. 4.1.5.16 Marking, packaging, transportation and storage Inspect the markings and labels item by item according to the requirements of 3.9 of this standard. 5 Inspection Rules
5.1 Classification of Unqualified Items
All items that fail to meet the requirements of Chapter 4 of this standard are considered unqualified. They are classified into three categories: A, B and C according to their impact on product quality. The classification of unqualified items is shown in Table 4.
5.2 Judgment Principles
5.2.1 The sampling judgment scheme is shown in Table 5. In the table, AQL is the qualified quality level, A. is the qualified judgment number, and R. is the unqualified judgment number. 5.2.2 The principle of item-by-item assessment and category-by-category judgment is adopted. When the number of unqualified items in each category is less than or equal to the qualified judgment number A., the batch is judged to be qualified; when the number of unqualified items in one category is greater than or equal to the unqualified judgment number R. 5
NY/T 646—2002
Classification of unqualified
Sampling plan
Qualified products
Productivity
Increased value of broken rate
Increased value of brown rice rate (paddy)
Safety
Instruction manual review
Unit power consumption
Reliability and effectiveness
Conveying screw
Bearing temperature rise
Welding quality||t t||Film thickness
Film adhesion
Appearance of paint
Idle running performance
Assembly quality
Table 4 Unqualified classification
Lifting and entry adjustment device Flexible reliability sign
Table 5 Sampling judgment plan
Unqualified classification
Sample size (n)
Number of items
Inspection level
Sample code2 The feeding amount during the test should be controlled within the range required to meet the rated productivity. 4.1.4.3 The test material should be one of the materials conveyed by the screw conveyor during normal operation. 4.1.4.4 When the test material is grain, its moisture content is <20% and the impurity content is ≤5%. 4. 1. 4. 5
The test instruments and meters should be qualified. The main measurement parameters and accuracy requirements should comply with the provisions of Table 3. Table 3 Measurement parameter accuracy requirements
Measurement parameters
Test material weighing
Sample processing weighing
Measurement moisture content weighing
4.1.4.6 Test data processing and rounding should comply with the provisions of GB/T8170. 4.1.5 Test content and methods
4.1.5.1 Idle operation test
Check each item according to the requirements of 3.2 of this standard, measure the noise, and observe the idle operation performance. 4.1.5.2 Bearing temperature rise measurement
Accuracy
±0.5 s/d
According to conventional requirements
After idling for 30 minutes, immediately measure the bearing and motor temperature rise with a temperature measuring instrument that can touch the bearing. 4.1.5.3 Noise measurement
Under idling state, measure at different positions around the prototype at a distance of 1m from the prototype surface and 1.5m above the ground. The measuring points should not be less than 5. The test method and data processing should comply with the provisions of GB/T3768. 4.1.5.4 Productivity measurement
4.1.5.4.1 After the idling operation is normal, put the material into full load operation and maintain a stable state. 4.1.5.4.2 The test time shall not be less than 30 minutes. Record the start and end time of the test, the material lifting height and the total mass of the material at the machine outlet. Calculate the productivity according to formula (1). Where:
Q is the production rate, in tons per hour (t/h); Q= 3.6
(1))
G is the total mass of the material during the measurement time, in kilograms (kg); T is the measurement time, in seconds (s).
4.1.5.5 Determination of unit power consumption
4.1.5.5.1 While measuring the production rate, test the electric power value (current and voltage, etc.), and record the screw conveyor inclination angle and the conveying length of the screw conveyor during the test.
4.1.5.5.2 The unit power consumption is expressed as the power consumed to transport 1t of material for a distance of 1m. Calculate according to formula (2). Abzxz.net
P= G(Leosβ+2Lsing)
Wherein:
Unit power consumption, in kilowatt-hours per ton-meter [kW·h/t·m)]; A——actual power consumption, in kilowatt-hours (kW·h); L
-screw conveyor length, in meters (m); β—conveyor inclination, in degrees (°); G
actual conveying mass, in tons (t).
·（2）
4.1.5.6 Reliability
Reliability effectiveness is calculated according to formula (3):
Wherein:
K= 2T+2T
K——Reliability effectiveness, in percentage (%); Tz—operating time per shift, in hours (h); T. Failure time per shift (including troubleshooting time), in hours (h). 4.1.5.7 Determination of the increase in the value of the broken rate
4.1.5.7.1 After the test begins, take samples every 5 minutes for a total of 3 times. Each sample weighs about 0.5kg. 4.1.5.7.2 Inspect the grain samples according to the relevant grain inspection standards. 4.1.5.8 Determination of the increase in the value of the brown rice rate of paddy
NY/T 646—2002
(3)
Take 50g of paddy from each sample before and after transportation, select the dehulled rice grains at room temperature and weigh them, and calculate the increase in the value of the brown rice rate.
4.1.5.9 Inspection of paint quality
Test the adhesion of the paint film according to the requirements of JB/T5673, measure the thickness of the paint film with a coating thickness gauge, and inspect the appearance quality of the paint with a ruler and visual inspection.
4.1.5.10 Inspection of conveyor screw
Inspect each item according to the requirements of 3.3 of this standard, and use a micrometer to measure the thickness of the spiral blade (the thickness of the rolled spiral blade is measured at 1/5 of the blade width from the shaft surface).
4.1.5.11 Inspection of shell
Inspect each item according to the requirements of 3.4 of this standard, and use a steel ruler with a length of 1m to detect the straightness and concave deformation of the shell surface. 4.1.5.12 Safety inspection
Inspect each item according to the requirements of 3.5 of this standard, and use a megohmmeter to measure the insulation resistance. 4.1.5.13 Assembly quality inspection
Inspect the assembly quality item by item according to the requirements of 3.6 of this standard. 4.1.5.14 Welding quality inspection
Inspect the welding quality item by item according to the requirements of 3.7 of this standard. 4.1.5.15 Instruction Manual Review
Inspect the instruction manual item by item according to the requirements of 3.8 of this standard. 4.1.5.16 Marking, packaging, transportation and storage Inspect the markings and labels item by item according to the requirements of 3.9 of this standard. 5 Inspection Rules
5.1 Classification of Unqualified Items
All items that fail to meet the requirements of Chapter 4 of this standard are considered unqualified. They are classified into three categories: A, B and C according to their impact on product quality. The classification of unqualified items is shown in Table 4.
5.2 Judgment Principles
5.2.1 The sampling judgment scheme is shown in Table 5. In the table, AQL is the qualified quality level, A. is the qualified judgment number, and R. is the unqualified judgment number. 5.2.2 The principle of item-by-item assessment and category-by-category judgment is adopted. When the number of unqualified items in each category is less than or equal to the qualified judgment number A., the batch is judged to be qualified; when the number of unqualified items in one category is greater than or equal to the unqualified judgment number R. 5
NY/T 646—2002
Classification of unqualified
Sampling plan
Qualified products
Productivity
Increased value of broken rate
Increased value of brown rice rate (paddy)
Safety
Instruction manual review
Unit power consumption
Reliability and effectiveness
Conveying screw
Bearing temperature rise
Welding quality||t t||Film thickness
Film adhesion
Appearance of paint
Idle running performance
Assembly quality
Table 4 Unqualified classification
Lifting and entry adjustment device Flexible reliability sign
Table 5 Sampling judgment plan
Unqualified classification
Sample size (n)
Number of items
Inspection level
Sample code5 Unit power consumption measurement
4.1.5.5.1 While measuring the productivity, test the electric power value (current and voltage, etc.), and record the screw conveyor inclination angle and the conveying length of the screw conveyor during the test.
4.1.5.5.2 The unit power consumption is expressed as the power consumed to convey 1t of material for a distance of 1m. Calculate according to formula (2). A
P= G(Leosβ+2Lsing)
Where:
Unit power consumption, in kilowatt-hours per ton-meter [kW·h/t·m)]; A——actual power consumption, in kilowatt-hours (kW·h); L
-screw conveyor length, in meters (m); β—conveyor inclination angle, in degrees (°); G
actual conveying mass, in tons (t).
·（2）
4.1.5.6 Reliability
Reliability validity is calculated according to formula (3):
Where:
K= 2T+2T
K is reliability validity, in percentage (%); Tz is the operation time per shift, in hours (h); T is the failure time per shift (including the time for troubleshooting), in hours (h). 4.1.5.7 Determination of breakage rate increment
4.1.5.7.1 After the test begins, take samples every 5 minutes, for a total of 3 times, and each sample weighs about 0.5kg. 4.1.5.7.2 Inspect the grain samples according to the relevant grain inspection standards. 4.1.5.8 Determination of the value-added rate of brown rice in rice
NY/T 646—2002
(3)
Take 50g of rice from each sample before and after transportation, select and weigh the hulled rice grains at room temperature, and calculate the value-added rate of brown rice.
4.1.5.9 Inspection of paint quality
Test the adhesion of the paint film according to the requirements of JB/T5673, measure the thickness of the paint film with a coating thickness gauge, and check the appearance quality of the paint with a ruler and visual inspection.
4.1.5.10 Inspection of conveying screw
Inspect each item according to the requirements of 3.3 of this standard, and use a micrometer to detect the thickness of the spiral blade (the thickness of the spiral blade formed by rolling shall be measured at 1/5 of the blade width from the shaft surface).
4.1.5.11 Shell inspection
Inspect item by item according to the requirements of 3.4 of this standard, and use a steel ruler with a length of 1m to check the straightness and concave deformation of the shell surface. 4.1.5.12 Safety inspection
Inspect item by item according to the requirements of 3.5 of this standard, and use a megohmmeter to measure the insulation resistance. 4.1.5.13 Assembly quality inspection
Inspect the assembly quality item by item according to the requirements of 3.6 of this standard. 4.1.5.14 Welding quality inspection
Inspect the welding quality item by item according to the requirements of 3.7 of this standard. 4.1.5.15 Instruction manual review
Inspect the instruction manual item by item according to the requirements of 3.8 of this standard. 4.1.5.16 Marking, packaging, transportation and storage Inspect the markings and labels item by item according to the requirements of 3.9 of this standard. 5 Inspection rules
5.1 Classification of unqualified items
All items tested that do not meet the requirements of Chapter 4 of this standard are considered unqualified. They are divided into three categories: A, B, and C according to the degree of impact on product quality. The classification of unqualified items is shown in Table 4.
5.2 Judgment principles
5.2.1 The sampling judgment plan is shown in Table 5. In the table, AQL is the qualified quality level, A. is the qualified judgment number, and R. is the unqualified judgment number. 5.2.2 The principle of item-by-item assessment and category-by-category judgment is adopted. When the number of unqualified items in each category is less than or equal to the qualified judgment number A., the batch is judged to be qualified; when the number of unqualified items in one category is greater than or equal to the unqualified judgment number R., the batch is judged to be unqualified. 5
NY/T 646—2002
Classification of non-conforming products
Sampling plan
Qualified products
Productivity
Increase in broken rate
Increase in brown rice rate (paddy)
Safety
Instruction manual review
Unit power consumption
Reliability and effectiveness
Conveying screw
Bearing temperature rise
Welding quality||t t||Film thickness
Film adhesion
Appearance of paint
Idle running performance
Assembly quality
Table 4 Unqualified classification
Lifting and entry adjustment device Flexible reliability sign
Table 5 Sampling judgment plan
Unqualified classification
Sample size (n)
Number of items
Inspection level
Sample code5 Unit power consumption measurement
4.1.5.5.1 While measuring the productivity, test the electric power value (current and voltage, etc.), and record the screw conveyor inclination angle and the conveying length of the screw conveyor during the test.
4.1.5.5.2 The unit power consumption is expressed as the power consumed to convey 1t of material for a distance of 1m. Calculate according to formula (2). A
P= G(Leosβ+2Lsing)
Where:
Unit power consumption, in kilowatt-hours per ton-meter [kW·h/t·m)]; A——actual power consumption, in kilowatt-hours (kW·h); L
-screw conveyor length, in meters (m); β—conveyor inclination angle, in degrees (°); G
actual conveying mass, in tons (t).
·（2）
4.1.5.6 Reliability
Reliability validity is calculated according to formula (3):
Where:
K= 2T+2T
K is reliability validity, in percentage (%); Tz is the operation time per shift, in hours (h); T is the failure time per shift (including the time for troubleshooting), in hours (h). 4.1.5.7 Determination of breakage rate increment
4.1.5.7.1 After the test begins, take samples every 5 minutes, for a total of 3 times, and each sample weighs about 0.5kg. 4.1.5.7.2 Inspect the grain samples according to the relevant grain inspection standards. 4.1.5.8 Determination of the value-added rate of brown rice in rice
NY/T 646—2002
(3)
Take 50g of rice from each sample before and after transportation, select and weigh the hulled rice grains at room temperature, and calculate the value-added rate of brown rice.
4.1.5.9 Inspection of paint quality
Test the adhesion of the paint film according to the requirements of JB/T5673, measure the thickness of the paint film with a coating thickness gauge, and check the appearance quality of the paint with a ruler and visual inspection.
4.1.5.10 Inspection of conveying screw
Inspect each item according to the requirements of 3.3 of this standard, and use a micrometer to detect the thickness of the spiral blade (the thickness of the spiral blade formed by rolling shall be measured at 1/5 of the blade width from the shaft surface).
4.1.5.11 Shell inspection
Inspect item by item according to the requirements of 3.4 of this standard, and use a steel ruler with a length of 1m to check the straightness and concave deformation of the shell surface. 4.1.5.12 Safety inspection
Inspect item by item according to the requirements of 3.5 of this standard, and use a megohmmeter to measure the insulation resistance. 4.1.5.13 Assembly quality inspection
Inspect the assembly quality item by item according to the requirements of 3.6 of this standard. 4.1.5.14 Welding quality inspection
Inspect the welding quality item by item according to the requirements of 3.7 of this standard. 4.1.5.15 Instruction manual review
Inspect the instruction manual item by item according to the requirements of 3.8 of this standard. 4.1.5.16 Marking, packaging, transportation and storage Inspect the markings and labels item by item according to the requirements of 3.9 of this standard. 5 Inspection rules
5.1 Classification of unqualified items
All items tested that do not meet the requirements of Chapter 4 of this standard are considered unqualified. They are divided into three categories: A, B, and C according to the degree of impact on product quality. The classification of unqualified items is shown in Table 4.
5.2 Judgment principles
5.2.1 The sampling judgment plan is shown in Table 5. In the table, AQL is the qualified quality level, A. is the qualified judgment number, and R. is the unqualified judgment number. 5.2.2 The principle of item-by-item assessment and category-by-category judgment is adopted. When the number of unqualified items in each category is less than or equal to the qualified judgment number A., the batch is judged to be qualified; when the number of unqualified items in one category is greater than or equal to the unqualified judgment number R., the batch is judged to be unqualified. 5
NY/T 646—2002
Classification of non-conforming products
Sampling plan
Qualified products
Productivity
Increase in broken rate
Increase in brown rice rate (paddy)
Safety
Instruction manual review
Unit power consumption
Reliability and effectiveness
Conveying screw
Bearing temperature rise
Welding quality||t t||Film thickness
Film adhesion
Appearance of paint
Idle running performance
Assembly quality
Table 4 Unqualified classification
Lifting and entry adjustment device Flexible reliability sign
Table 5 Sampling judgment plan
Unqualified classification
Sample size (n)
Number of items
Inspection level
Sample code2 The principle of item-by-item assessment and category-based judgment is adopted. When the number of each type of unqualified items is less than or equal to the qualified judgment number A., the batch is judged to be qualified; when the number of each type of unqualified items is greater than or equal to the unqualified judgment number R., the batch is judged to be unqualified. 5
NY/T 646—2002
Unqualified classification
Sampling plan
Qualified products
Productivity
Broken rate value-added
Brown rice rate value-added (rice)
Safety
Instruction manual review
Unit power consumption
Reliability and effectiveness
Conveying screw
Bearing temperature rise
Welding quality||t t||Film thickness
Film adhesion
Appearance of paint
Idle running performance
Assembly quality
Table 4 Unqualified classification
Lifting and entry adjustment device Flexible reliability sign
Table 5 Sampling judgment plan
Unqualified classification
Sample size (n)
Number of items
Inspection level
Sample code2 The principle of item-by-item assessment and category-based judgment is adopted. When the number of each type of unqualified items is less than or equal to the qualified judgment number A., the batch is judged to be qualified; when the number of each type of unqualified items is greater than or equal to the unqualified judgment number R., the batch is judged to be unqualified. 5
NY/T 646—2002
Unqualified classification
Sampling plan
Qualified products
Productivity
Broken rate value-added
Brown rice rate value-added (rice)
Safety
Instruction manual review
Unit power consumption
Reliability and effectiveness
Conveying screw
Bearing temperature rise
Welding quality||t t||Film thickness
Film adhesion
Appearance of paint
Idle running performance
Assembly quality
Table 4 Unqualified classification
Lifting and entry adjustment device Flexible reliability sign
Table 5 Sampling judgment plan
Unqualified classification
Sample size (n)
Number of items
Inspection level
Sample code
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