Some standard content:
ICS65.040.20
Machinery Industry Standard of the People's Republic of China
JB/T6286-1999
Jet-air whitening machine
Published on September 17, 1999
State Bureau of Machinery Industry
Implementation on January 1, 2000
JB/T6286-1999
This standard is a revision of JB/T6286-92 "Technical Conditions for Jet-air Iron Roller Rice Milling Machine". Compared with JB/T6286-92, the main technical content of this standard has changed as follows: 1) Standard name: changed from "Technical conditions of air jet iron roller rice mill" to "air jet rice mill"; 2) Scope of application: This standard is applicable to single-channel and double-channel air jet rice mills; 3) Standard content: added rice mill test methods and double-channel air jet rice mill whitening quality indicators, and also added technical requirements for sand rollers.
This standard replaces JB/T6286--92 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Agricultural Machinery Standardization Technical Committee. The responsible drafting units of this standard are: National Grain and Oil Processing Machinery Quality Supervision and Inspection Center, Shandong Rizhao Machinery Group Co., Ltd., Shandong Agricultural Machinery Science Research Institute.
The main drafters of this standard are: Wu Yilong, Zhang Wensong, Chen Kemin, Wu Guoxian, Mou Dunshan, Wang Dongyue, Bai Yang. This standard was first issued and implemented on June 10, 1992. 1 Scope
Machinery Industry Standard of the People's Republic of China
Jet-air rice whitening machine
Jet-air whitening machine
This standard specifies the performance indicators, technical requirements, test methods and inspection rules of jet-air rice whitening machine. This standard applies to single-duct and double-duct jet-air rice whitening machines (hereinafter referred to as rice whitening machines). 2 Referenced standards
JB/T6286—1999
Replaces JB/T6286—92
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T1184—1996
GB1350—1986
GB1354—1986
GB/T 1804---1992
GB/T2828—1987
GB/T3943—1983
GB/T5490~5539-1985
GB/T6414—1986
GB/T9239—1988
GB/T133061991
ZBB22003—1985
3 Technical requirements
Shape and position tolerancesUnspecified tolerance values
Unspecified tolerances for linear dimensions
General tolerances
Batch-by-batch inspectionCount sampling procedures and sampling tables (applicable to inspections of continuous batches)Circular and long hole screens
Grain, oil and vegetable oil inspection
Casting dimension tolerances
Rigid rotor balance qualityDetermination of allowable imbalanceSignage
3.1 The rice mill shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 3.2 When the rice mill is charged with second-grade brown rice specified in ZBB22003 and third-grade rice specified in GB1350, the performance shall comply with the provisions of Table 1 (single air duct) and Table 2 (double air duct) respectively. 3.3 Technical requirements for main components
The screen shall be manufactured in accordance with the provisions of GB/T3943, with a flat surface and no cracks. 3.3.1
3.3.2 Service life of drum:
a) When adding brown rice, not less than 300h:
b) When adding rice, not less than 250h.
Approved by the State Machinery Industry Bureau on September 17, 1999 and implemented on January 1, 2000
Rice addition! Accuracy
Rough rice white rate
Total broken rice rate
Small broken rice rate
Grain content
Rice bran powder rate
Increased broken rice rate
Electricity consumption per ton of material
Dust concentration
Finished product temperature rise
Rated unit power productivity
Rice addition 1 accuracy
Equivalent rice output rate|| tt||Total broken rice rate
Millet rate
Grain content
Rice bran powder rate
Bran flakes and grain mouth content in rice
Electricity consumption per ton of material
Dust concentration
Finished product temperature rise
Rated unit power productivity
Grains/kg
kw·h/t
kg/(kW ·h)
Grains/kg
kW·h/t
kg/(kW·h)
JB/T6286-1999
Performance index table of single-channel jet rice mill Early glaze
≥100
Conform to the standard specified in GB1354 First grade
≥100
Performance index table of double-channel jet rice mill Early sugar
Conform to the standard specified in GB1354 First grade
The diamond abrasive bonded on the sand mill is tested for 10 minutes under the condition that the linear speed at the minimum diameter of the sand mill is not less than 15m/s. No peeling is allowed.
The dimensional tolerance of the casting shall be manufactured according to the 10-level precision specified in GB/T6414. 3.3.4
3.3.5 The shape and position tolerances of mechanical parts without markings shall comply with the provisions of GB1184, and the tolerance values of their straightness, flatness, coaxiality and symmetry shall be L level.
JB/T6286-1999
3.3.6 The limit deviation of mechanical parts without markings of dimensional tolerances shall be manufactured in accordance with the m level specified in GB/T1804. 3.3.7 The fan impeller shall be subjected to a static balance test, and its accuracy shall not be lower than the G16 level specified in GB/T9239. 3.4 Assembly requirements
All parts (including purchased parts and outsourced parts) must be inspected and qualified before assembly. 3.4.1
After the whole machine is assembled, the joint surface shall be well fitted, and no leakage is allowed. 3.4.2
After assembly, turn the pulley smoothly by hand. Each rotating part should be flexible and reliable, and no jamming is allowed. 3.4.3
When the rice mill is loaded, the bearing temperature rise shall not exceed 20℃. 3.4.4
3.5 Appearance quality
The surface of the casting should be smooth and no casting defects that affect the mechanical properties and appearance quality of the casting are allowed. The surface of the sheet metal should be smooth and flat, and no hammer marks are allowed. 3.5.2
3.5.3 Burn-through and leakage welding are not allowed at the welding parts. 3.5.4 The quality of the paint film adhesion should not be lower than the .2 level specified in Appendix A (Appendix of the Standard) of this standard. 3.5.5 The coating is firm and the surface is flat, without peeling, wrinkling, and flow marks. 3.6 Safety requirements
3.6.1 The moving parts should have obvious safety warning signs. 3.6.2 If the rice mill is sold with a motor, the moving parts must have safety protection devices. 3.6.3 If the rice mill is sold without a motor, instructions must be given on how to install the safety protection device, and installation holes must be left on the machine body. 3.7 Three Guarantees Requirements
In compliance with the installation, use and storage conditions specified by the manufacturer, within one year from the date of purchase, if the product is damaged or cannot work normally due to poor manufacturing quality, the manufacturer shall be responsible for repair, replacement and refund. 4 Test Method
4.1 Test Principle
The basis of this method is to adjust the rice mill to a normal and stable working state and complete various test measurements within the specified time. 4.2 Test Conditions and Preparation
4.2.1 There must be a site that meets the requirements and is equipped with fixed test personnel. 4.2.2 All test instruments and meters should be calibrated and qualified; feeding, receiving and sampling tools should be fully prepared. 4.2.3 The raw grains used in the performance test should be iron-free, and the raw grains for the same test should be mixed evenly. Paddy rice should meet the requirements of the third-grade rice in GB1350; brown rice should meet the requirements of the second-grade brown rice in ZBB22003. 4.2.4 The tests shall all use Y series motors, and their matching power shall meet the requirements of the instruction manual. The deviation of the test voltage shall not exceed ±5% of the rated voltage.
4.2.5 The test prototype shall be installed and debugged to normal working condition according to the requirements of the instruction manual. At the same time, record the structural parameters of the prototype and the rated power of the matching motor.
4.3 Performance test
4.3.1 Requirements
4.3.1.1 Each prototype shall be tested twice, each time for no less than 30 minutes, and the arithmetic mean of the obtained data shall be taken. 4.3.1.2 The average output power of the motor during the test shall not exceed 10% of the rated power. JB/T62861999
4.3.1.3 If any of the following situations occurs, the test will be invalid: a) The total mass of all materials leaving the machine is greater than the total mass of the raw grain of the machine and the human body; b) The material loss rate is greater than 1%;
c) The precision of the finished products leaving the machine is significantly different;
d) The machine is shut down due to replacement of the motor or unexpected circumstances. 4.3.2 Inspection of raw grain
The inspection method shall be carried out in accordance with the relevant parts of GB/T5490~5539. 4.3.3 No-load test
After the machine is running normally, measure the current, voltage and the speed of each shaft and record them. 4.3.4 Load test
Add the accurately weighed raw grain into the hopper, start the machine first, then open the feed gate, and operate quickly to make the finished product reach the required precision. The operation time shall not exceed 5 minutes. The finished product with slightly low precision at the beginning shall be returned to the machine after the third sampling is completed, and the raw grain shall be completely milled. Stop the machine after the rice mill stops discharging rice.
4.3.4.1 Current, voltage and speed
After the test starts, measure the current and voltage every 5 minutes: after the test is normal, measure the speed twice for each test, and record 4.3.4.2 Time and power consumption
The feed gate is opened and the timing starts. The timing ends when all the raw grain passes through the feed gate. At the same time, record the initial and final readings of the electric meter at the corresponding time.
4.3.4.3 Rice temperature
Use a point thermometer to measure the temperature of the raw grain and the temperature of the finished product in the finished product basket 50 minutes after the start of the test. 4.3.4.4 Bearing temperature
Use a point thermometer to measure the surface temperature of the bearing housing at the beginning and end of the test. 4.3.4.5 Dust concentration
The measurement is carried out indoors. 10 minutes after the start of the test, use a dust sampler to select two measuring points within the range of the operator's activities at the loading station and the collection station for sampling, and measure their dust concentration. The horizontal position of the measuring point is 1m from the surface of the unit and 1.5m from the ground: 4.3.4.6 Noise
When measuring, the horizontal position of the microphone of the sound level meter is 1m from the surface of the machine and 1.5m from the ground. Four points are measured: front, back, left and right.
Before the noise test, the background noise should be measured first. When measuring, make the microphone of the sound level meter face the direction of the noise source. The reading value of the sound level meter is an integer value close to the indicated value. When the pointer swings greatly, the average value of the pointer swing can be selected. When the difference between the sound levels measured at adjacent measuring points exceeds 5dB(A), additional measuring points should be added between them. The noise value of the unit should be the arithmetic mean of each measuring point.
The background noise should be at least 10dB(A) lower than the measured noise level of the unit. When the above requirements cannot be met and the difference is less than 3dB(A), the measurement is invalid. When the difference is 3~9dB(A), correction should be made. 4.3.4.7 Quality of various materials
Weigh the raw grain and the rice out of the machine separately.
Quality inspection of finished products
JB/T6286—1999
The sampling of finished products should be carried out three times after the test is normal, at the beginning, in the middle and at the end, with a total mass of not less than 2kg. Each time, the grain flow is taken cross-sectionally, and the quantity is checked each time. The three mixed parts are the finished product samples of the test. The quality inspection method of the finished product shall be carried out in accordance with the relevant parts of GB/T5490~5539. 4.4 Calculation of several indicators
4.4.1 Material loss rate is calculated according to formula (1): )x100%
Where: -Material loss rate
Q.-Total mass of materials leaving the machine, kg;
2.Total mass of raw grains for manpower and machine, kg.
4.4.2 Rice yield is calculated according to formula (2):
Where: -Rice yield;
Qa——Total mass of finished rice, kg.
4.4.3 Equivalent rice yield
Equivalent rice yield is the actual rice yield of the rice mill converted into the rice yield when the rough rice yield is equivalent to 76% and the rough rice yield is equivalent to 79%. Calculate according to formula (3) and formula (4): Rice:
Stalked rice:
Where: Equivalent rice yield;
g----actual rough rice yield of the raw grain used in the experiment,%. 4.4.4 Increased broken rice yield is calculated according to formula (5):
Where: &---Increased broken rice yield, %;
——Broken rice yield of white rice leaving the machine, %;
.一—Broken rice yield of brown rice entering the machine,%.
4.4.5 Rough white rice yield is calculated according to formula (6): Where: Rough white rice yield;
2——Mass of brown rice entering the machine, kg.
4.4.6 Electricity consumption per ton of material is calculated according to formula (7): S
×100%
Where: G.—Electricity consumption per ton of material, kW·h/t; Ga—Electricity consumption, kW·h.
4.4.7 The pure working hour productivity is calculated according to formula (8): Where: E is the pure working hour productivity, kg/h; T is the test time, h.
JB/T6286-1999
4.4.8 The nominal unit power productivity is calculated according to formula (9): Where: E is the nominal unit power productivity, kg/(kW·h); P is the nominal power of the matching motor, kW.
4.4.9 The motor load level is calculated according to formula (10) and formula (11): P
Where: 6 is the motor load level:
P is the load power of the motor, kW;
n is the nominal efficiency of the motor, %.
4.5 Production test
4.5.1 Purpose
To assess the economical use, reliability, performance stability, regional adaptability, convenience of adjustment and maintenance, durability of main parts and wearing parts, and working conditions and safety of the machine. 4.5.2 Requirements
Before mass production, at least two prototypes shall be put into production test, and the test shall be carried out at different points. The pure working time of one of them shall not be less than 300 hours, and the pure working time of the other shall not be less than 100 hours. For mass-produced products, at least one prototype shall be sampled and tested, and the pure working time shall not be less than 150 hours: the average load level of the motor shall not be less than 80%. 4.5.3 Measurement items and methods
4.5.3.1 During the production test, at least three performance measurements shall be made on the prototype, namely the beginning, the middle and the end. The purpose and method are the same as those of the performance test of this standard.
4.5.3.2 The whole process of the production test shall be recorded, and the measurement data shall be collated and summarized. 4.5.3.3 For wearing parts, technical measurements shall be made at the same location before and after the test or before and after replacement, and records shall be kept. If necessary, photos shall be taken.
4.5.3.4 If the main parts are damaged or replaced during the test, the test operation time shall be recalculated. The deformation or damage of the main parts shall be recorded.
4.5.3.5 During the production test, the prototype shall be checked for production for no less than three consecutive shifts. The working time of each shift shall not be less than 6 hours and records shall be kept. 4.5.4 Calculation of technical and economic indicators JB/T6286-1999 4.5.4.1 The hourly productivity of pure T work is calculated according to formula (12): E. In the formula: E——Hourly productivity of pure T work, kg/h; Eh Qeb——Processing volume (raw grain) of the production shift, kg; T——Pure T working time of the production shift, h. 4.5.4.2 Hourly productivity of the shift is calculated according to formula (13): 29 In the formula: E——Hourly productivity of the shift, kg/h; Q——Shift output (raw grain) during the production assessment period, kg; T.——Shift time during the production assessment period, h. 4.5.4.3 The power consumption per ton of material is calculated according to formula (14): G.
Where: G. Power consumption per ton of material, kW·h/t; EG.
—Energy consumption per production check, kW·h4.5.4.4. The reliability of use is calculated according to formula (15): K
Where: K—reliability of use;
T—operation time during production check, h; ET.
ZT,+ET
T,—fault troubleshooting time per shift during production check, h. 4.5.4.5 The shift time utilization is calculated according to formula (16): Kb
Where: K—shift time utilization.
5 Inspection rules
·(t3)
· (16)
5.1 Before the product leaves the factory, the appearance and assembly quality shall be checked one by one, and the idle running test shall be carried out. The idle running time shall not be less than 20 minutes, and the following requirements shall be met:
a) The machine shall run normally and smoothly without any abnormal phenomenon; b) All connecting parts and fasteners shall not be loose; c) The adjustment device shall be flexible and reliable.
5.2· The rice mill shall be inspected and qualified by the quality inspection department of the manufacturer and the certificate of conformity shall be issued before it can leave the factory. 5.3 For batch-produced products, at least 2 units shall be sampled for type inspection every six months under normal production conditions, and the results shall comply with the provisions of this standard.
JB/T6286-1999
5.4 The ordering unit has the right to conduct random inspections on the products leaving the factory in accordance with the provisions of GB/T2828. The form, batch and AQL value of the random inspection shall be determined by the ordering unit and the manufacturer through consultation.
6 Marking, packaging, transportation and storage
6.1 The product label should be fixed in a conspicuous position. The product label should comply with the provisions of GB/T13306 and include: a) product name and model; b) matching power; c) spindle speed; d) pure.T. hourly productivity; e) quality; f) factory number and date: g) manufacturer name.
6.2 The supply and demand parties shall negotiate to select appropriate materials and methods for packaging when the product is suitable for transportation, loading and unloading and ensures integrity and undamaged. Export products shall be packaged according to the requirements of the foreign trade department. 6.3 Random documents, spare parts and accessories:
a) Product instruction manual;
b) Product inspection certificate;
c) Packing list;
d) Spare parts and accessories (provided as specified in the instruction manual). 6.4 Products should be stored on a flat floor and in a well-ventilated room, and should be protected from moisture, corrosion and rust. A1 Materials and instrumentsbzxZ.net
18# sewing machine needle
Triangle or ruler
Four-fold magnifying glass
8# drawing pen
A2 Test method
JB/T6286-1999
Appendix A
(Standard Appendix)
Determination method of film adhesion
After the paint film is dry (as specified in the paint product manual), use a triangle or ruler to make six parallel scratches on the paint film with a No. 18 sewing machine needle (scratch spacing: when the paint film thickness is greater than 60μm, the spacing is equal to 2mm; when the paint film thickness is less than 60μm, the spacing is equal to 1mm). When scratching, the scratching needle should be perpendicular to the scratched surface and the pressure should be steady and uniform. The scratch should penetrate the entire paint film, and then make six scratches with the same spacing, perpendicular to the previous one. The scratching needle should be replaced after it is blunt. After scratching, use a drawing pen to gently brush forward and backward along the diagonal direction of the grid pattern for 5 times to remove the peeling part of the paint film, and observe the results with a four-fold magnifying glass.
The grades are divided into four levels (see Table AI). Usually, three different positions should be selected on the non-frontal surface of the component for scratch inspection. If at least two positions reach level 2 or above, it will pass, and if it is below level 2, it will fail. Table A1
The coating has a little peeling at the intersection of the scratches, and the peeling area is not more than 5%. The coating is left along the edge of the scratch or at the intersection of the scratches, and the remaining peeling area is not more than 15%. The coating is partially or completely peeled along the edge of the scratch, and the peeling area is not more than 35%. The coating is peeled off in large pieces along the edge of the scratch, and the peeling area is greater than 35%.
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