Some standard content:
ICS65.060.20
Machinery Industry Standard of the People's Republic of China
JB/T8401.3-2001
Smashed root-stubbe machine
Smashed root-stubbe machine
Published on 2001-06-22
China Machinery Industry Federation
Implementation on 2001-10-01
JB/T8401.3—2001
This standard is a revision of JB/T8401.3—1996 "Straw stubble crushing machine". This standard amends the main contents of JB/T8401.3-1996 as follows: The scope of application of the standard has been amended:
- Added the product model representation method;
Added and amended the requirements for the main performance indicators of the product;
- Amended the technical requirements for the whole machine;
- Amended the content of the product safety requirements;
Amended some contents of the test method:
Adjusted the classification of product inspection items:
- Added the provisions of the product manual; The expression of some clauses has been revised. This standard replaces JB/T8401.3-1996 from the date of implementation. This standard is proposed and managed by the National Agricultural Machinery Standardization Technical Committee. The responsible drafting unit of this standard: China Agricultural Mechanization Science Research Institute. The participating drafting units of this standard: Nanjing Agricultural Mechanization Research Institute, Xuchang County Agricultural Machinery General Factory. The main drafters of this standard: Liu Yundong, Bai Yucheng, Liu Shaolin, Jia Honglei, Wang Quan, Gao Erguang. This standard was first issued in September 1996, and this is the first revision. 1
1 Scope
Machinery Industry Standard of the People's Republic of China
Smashed root-stubblemachine
Smashed root-stubblemachine
JB/T8401.3—2001
Replaces JB/T84013—1996
This standard specifies the evaluation indicators, safety requirements, technical requirements, test methods and inspection rules for the product quality of root-stubblemachine. This standard applies to root-stubble crushing machines used for crushing crop stubbles that are matched with tractors. 2 Referenced standards
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/T2751993
GB/T 699 — 1999 ||tt | | tt | 10395.1—2001
GB 10395.5—1996
GB 103961999
GB/T11365—1989
GB/T17126—1997
JB/T5673—1991
JB/T85741997
JB/T97911999
3Product model representation method
Match of rolling bearings with shafts and housings
High-quality carbon structural steel
Dimensions, tolerances and inspection of rectangular splines
Tolerances of form and positionTolerance values not indicated
General tolerancesTolerances of linear and angular dimensions without tolerancesBatch-by-batch inspectionCount sampling procedures and sampling tables (applicable to inspection of continuous batches)Alloy structural steel
Mechanical properties of fasteners
Bolts, screws and studs
Mechanical properties of fastenersScrews Mother
Cylindrical spur involute spline moduleBasic tooth profile toleranceGray cast iron parts
Rules for writing instruction manuals for agricultural and forestry tractors and machinery, lawn and gardening power machineryInvolute cylindrical gear accuracy
Safety technical requirements for agricultural and forestry tractors and machineryPart 1: General
Agricultural and forestry tractors and machinery
Safety technical requirementsPart 5: Driven tillage machinerySafety signs and hazard graphics for agricultural and forestry tractors and machinery, lawn and gardening power machineryGeneral
Precision of bevel and hypoid gears
Position of power output universal joint drive shaft and power input connection device for agricultural tractors and machineryGeneral technical conditions for painting of agricultural and forestry tractors and implementsRules for compiling product models of agricultural implements
Product models of safety shields for universal joint drive shafts of agricultural machinery are compiled in accordance with JB/T8574.
Approved by China Machinery Industry Federation on June 22, 2001, implemented on October 1, 2001
Product model representation method of stubble crusher: GH
JB/T8401.3—2001
Improvement code
Main parameter: working width, cm
Category code: stubble crusher
Classification code: indicates tillage machinery
Improvement code: The prototype is not marked; the improved version is marked with letters A, B. The first improvement is marked with A, the second improvement is marked with B, and so on.
Marking example:
A stubble crusher with a working width of 160cm is represented as: 1GHH160
4 Evaluation index
The stubble crusher should be manufactured according to the product drawings and technical documents approved through the prescribed procedures and comply with the provisions of relevant standards. The quality assessment index of the stubble crushing and returning machine shall be determined according to its technical level and quality level. When the stubble crushing and returning machine is operated at a rated productivity of 4.3
in a flat or cropland with a soil moisture content of no more than 25% and an average stubble height of no more than 25cm, the main performance index shall comply with the provisions of Table 1 (the length of qualified stubble is ≤50mm, excluding the length of fibrous roots). Table 1
Deepness of extinction
Root flower crushing rate
Root stubble coverage
Power consumption
Reliability of use shall comply with the provisions of Table 2.
Mean time between failures (MTBF)
Mean life of blade (MTTF)
5 Technical requirements
General technical requirements
The tolerance grade of dimensions without tolerance shall be selected in accordance with GB/T1804-c. 5.1.2
2 The shape and position tolerances not specified shall be selected in accordance with GB/T1184-K. 5.1.3
The sharp corners of the machined parts shall be chamfered, and the gas-cut parts shall be ground flat. h
Quality assessment index
≤85%Matching power
≥100
5.2 Technical requirements for main parts and components
JB/T8401.3—2001
5.2.1 The gear housing shall be made of HT200 gray cast iron material with mechanical properties not lower than those specified in GB/T9439. 5.2.2 The gears shall be made of 20CrMnTi material with mechanical properties not lower than those specified in GB/T3077. The tooth surface must be carburized and the thickness of the carburized layer is 10%-15% of the gear module. The heat treatment hardness of the tooth surface quenching zone is 58~64HRC, and the core hardness is 33~45HRC. 5.2.3 The machining accuracy of the gear shall comply with the relevant provisions of GB/T10095 and GB/T11365. 5.2.4 Spline shaft
5.2.4.1 The spline shaft is made of 40Cr material with mechanical properties not lower than those specified in GB/T3077. The overall quenching and tempering treatment has a hardness of 240-269HB
5.2.4.2 The size, tolerance and inspection of the rectangular spline shall comply with the relevant provisions of GB/T1144. 5.2.4.3 The module, basic tooth profile and tolerance of the involute spline shall comply with the relevant provisions of GB/T3478.1. 5.2.5 The matching tolerances of rolling bearings, shafts and housings shall comply with the relevant provisions of GB/T275. 5.2.6 Welding of knife shafts
5.2.6.1 After welding, the knife shafts and knife seats shall be heat treated to eliminate internal stress. 5.2.6.2 The coaxiality of the shaft necks at both ends of the knife shafts and the bearings is recommended to be selected according to Grade 8 in GB/T1184. 5.2.7 Blades
5.2.7.1 The blades shall be made of 65Mn steel with mechanical properties not lower than those specified in GB/T699. 5.2.7.2 The blade must be heat treated, the surface heat treatment hardness is 48~54HRC, and the core hardness is 3845HRC. 5.3 Universal joint drive shaft
5.3.1 The power universal joint drive shaft and the power input connection device shall comply with the relevant provisions of GB/T17126. Universal joint drive shaft is recommended to use type A.
5.3.2 The universal joint drive shaft protective cover shall comply with the relevant provisions of JB/T97915.4 Assembly technical requirements
5.4.1 All parts and components must be inspected and qualified, and purchased parts and outsourced parts must have inspection certificates before assembly. 5.4.2 The strength grade of the fasteners bearing loads at the cutter shaft and gearbox is: bolts shall not be lower than grade 8.8 specified in GB/T3098.1, and nuts shall not be lower than grade 8 specified in GB/T3098.2. 5.5 Technical requirements for the whole machine
5.5.1 After each stubble crusher is assembled, it should be tested for 30 minutes of idling within the working speed range of the cutter shaft. The operation should be stable, and the system should not have any jamming, collision or abnormal noise. After parking, check the following items: a) Tightness: All connectors and fasteners must not be loose; b) After the lubricating oil of the transmission box is filtered with a 100-mesh filter, its impurity content is not more than 20mg/kW; c) Oil temperature: Within the specified oil position range, the temperature rise of the lubricating oil in the gear box shall not exceed 25℃; d) The temperature rise of the bearing seat and bearing parts shall not exceed 25℃; e) Sealing: No leakage or dripping of oil is allowed.
5.5.2 The painting should comply with the relevant provisions of JB/T5673. The coating of the whole machine should be uniform, flat, smooth, and without exposed bottom. The coating thickness is greater than 35μm, and the adhesion of the paint film reaches level II in three places. 5.5.3 Measures should be taken to prevent the parts that do not need to be painted, such as suspension pins, holes, exposed spline shafts, sleeves, etc., from being painted, and anti-rust measures should be taken. 3
6 Safety requirements
JB/T8401.3—2001
6.1 The universal joint transmission shaft should have a reliable safety protection device, and the protection method should comply with the provisions of 12.3 of GB10395.12001 on universal joint transmission shaft.
6.2 The protection of the top, rear, front and end of the stubble crushing and returning machine should comply with the corresponding provisions of 4.1, 4.2, 4.3 and 4.4 of GB10395.5-1996.
6.3 Safety signs
6.3.1 Safety signs should comply with the provisions of GB10396. 6.3.2 Use warning signs to describe the following potential dangers: a) The slewing shaft at the front of the machine may entangle the body parts. When the machine is operating or the slewing shaft is rotating, keep a safe distance between the person and the machine:
b) There are flying objects at the rear of the machine that may impact the entire body. Keep a safe distance between the person and the machine during operation: c) The safety cover must not be opened or removed when the machine is running. 6.3.3 Use caution signs to describe the following information: a) Please read the instruction manual in detail before operation and maintenance: b) During maintenance, cut off the power and support the machine reliably. 7 Test method
7.1 Test conditions and preparation
7.1.1 Test prototype preparation bzxZ.net
The test prototype should be consistent with the instruction manual provided by the manufacturer, pass the inspection, and be in good technical condition. 7.1.2 Test instrument and equipment preparation
The instruments and equipment used for the test need to be checked and calibrated, and the measuring instruments should be within the specified effective calibration period. The comparative test should be carried out under the same conditions.
7.1.3 Preparation of supporting tractors
The supporting tractor should be in good condition, and the wheelbase and rated speed of the power output shaft should meet the design requirements of supporting products. 7.1.4 Selection of test sites
Select a representative test site. The test site should be flat, with a slope angle of no more than 5°, a length of no less than 50m, and a width of no less than 6 times the working width of the stubble crusher.
7.1.5 Survey of test sites
7.1.5.1 Determination of soil moisture content
Sampling five points on the diagonal of the test site, each measuring point is layered at 10am, using a soil box to sample 0~10cm and 10~20cm soil, and the sampling volume of each layer is no less than 30g (remove impurities such as stones and plant residues), weigh the wet weight and dry weight of each layer of soil, and calculate the soil moisture content (absolute), average moisture content of each layer, and average moisture content of the whole layer, or use a soil moisture meter to measure. ..-.M. .00%.
Where: H is soil moisture content;
Mis, Mg——mass of wet soil and dry soil, g. 4
.... ()
7.1.5.2 Determination of soil firmness
JB/T8401.32001
Use a soil firmness meter to measure, the measuring points correspond to the measuring points of soil moisture content, and calculate the average values of the stratification and the whole layer respectively. 7.1.5.3 Root density
Take five samples on the diagonal line of the test site, each of which should be measured on the same row, measure the number of stubble plants within 1/bm (b is the row spacing, unit m), and calculate the average value to represent the stubble density per square meter. 7.1.5.4 Stubble height
Take five sampling points on the diagonal line of the test site, measure ten plants (clusters) at each point, measure the distance from the highest point of the stubble (excluding the awn length) to the ground, and calculate the average value.
7.1.5.5 Stubble moisture content
The sampling points correspond to the measurement points of the stubble height. Take the stubble on the surface, sample no less than 50g at each point, weigh the wet weight, weigh the dry weight after drying, and calculate the stubble moisture content (absolute).
Where: H stubble moisture content;
M stubble wet weight, g:
M——stubble thousand weight, g.
7.2 Operation performance measurement
7.2.1 Test conditions
The test unit should operate at full speed according to the minimum forward speed, design forward speed, and maximum forward speed required by the instruction manual. Each forward speed is a test condition, with three test conditions in total, and two strokes are measured for each condition. Product quality inspection and prototype comparison test can be carried out according to the designed forward speed condition.
7.2.2 Stubble cutting depth
Measured with a depth gauge or depth gauge. During the measurement, measure one point every 2m within the measurement area along the forward direction of the unit, and measure 10 points on the left and right of each stroke. When stacking, take the top line of the stack as the reference. Calculate the average value. a) The stroke value is calculated as follows:
(3)
b) The working condition value is calculated as follows:
In the formula: a
JB/T8401.32001
V=S×100%
Average stubble cutting depth of the ith stroke, cm; Stubble cutting depth value of the ith point in the ith stroke, cm; Number of measuring points in the th stroke:
Standard deviation of stubble cutting depth of the 1st stroke; Coefficient of variation of stubble cutting depth of the 1st stroke: Coefficient of stability of stubble cutting depth of the th stroke: Average stubble cutting depth of the working condition, cm:
Number of strokes in the same working condition;
Standard deviation of stubble cutting depth of a working condition, cm;
Coefficient of variation of stubble cutting depth of a working condition:
Stability coefficient of stubble cutting depth of a working condition.
7.2.3 Stubble crushing rate
Measure one point in each stroke, take an area of 1m multiplied by the working width at each point, measure all stubbles on the surface and within the stubble depth range, measure the total stubble mass and the qualified stubble mass (the length of qualified stubble is ≤50mm, excluding the length of fibrous roots), calculate the root crushing rate according to the following formula, and calculate the average value.
Where: F
Stubble crushing rate;
M—Qualified stubble mass, g
MTotal stubble mass, g.
7.2.4 Stubble coverage rate
M×100%
Measure no less than three points in each working condition, take an area of 1mX1m on the cultivated land, measure the mass of stubble and vegetation above the surface, and the mass of stubble and vegetation within the stubble depth range below the surface, and calculate the stubble coverage rate according to the following formula. F.
W——stubble coverage rate;
W——stubble and vegetation mass within the stubble depth below the ground surface, 9W, stubble and vegetation mass above the ground surface, g. 7.2.5 Power consumption
The power consumption of the stubble crusher consists of two parts: drive power consumption and traction power consumption. It is recommended to use the electrical measurement method for drive power consumption. The torque and speed of the tractor power output shaft are measured simultaneously in the full stroke to calculate the drive power consumption. The traction power consumption can be measured by the car-pulling method to measure the traction, measure the forward speed, and calculate the traction power consumption. It can also be calculated by measuring the tractor drive wheel drive torque and speed to calculate the tractor drive wheel power consumption. Traction power consumption:
N,=(PP\)vX10-
Working part drive power consumption:
YuanM.ng×10
Power consumption of tractor driving wheel:
Total power consumption of machine:
Where: N
N,=×104-
Total power consumption of machine, kW;
YuanMmn×10-
Universal drive shaft driving power consumption, kW;
When measuring traction, machine traction power consumption, kW: Power consumption of tractor driving wheel, kW;
Universal drive shaft Driving torque, N·m:
Universal transmission shaft speed, r/min;
Tractor traction when implement is in operation, N; Tractor traction when no-load, N:
Tool operation speed, m/s:
Tractor drive wheel torque when implement is in operation, N·m: Drive wheel torque when tractor is no-load, N·m; Tractor drive wheel speed when implement is in operation, r/min; Drive wheel speed when tractor is no-load, r/min. 7.3 Production test
7.3.1 Reliability assessment
(17)
The timed truncation test method is adopted, and the total working time of each test prototype is 110h. During the test, the working condition, failure condition and repair condition of each prototype are recorded, and the mean time between failures (MTBF) and the mean life of the blade (MTTF) are calculated. 7.3.2 Mean time between failures
MTBF=ET,/R.
Where: MTBF-mean time between failures, h: R.-the total number of general and serious failures that occurred during the production assessment period, excluding minor failures. (18)
If during the production assessment period, the assessed machine has a major or fatal failure (referring to personal injury accidents, failures that cause the machine to not work normally due to quality reasons, and major economic losses), the effectiveness and mean time between failures are both unqualified. 7.3.3 Pure working hour productivity
Continuously check the operation of the stubble crushing and returning machine for three shifts, each shift operation is not less than 6h, and the time is accurate to min. 7
JB/T8401.3-2001
Where: E
Pure working hour productivity, hm/h:
Operation area of the production assessment shift, hm2;
T-pure operation time of the production assessment shift, h. 7.3.4 Shift hourly productivity
Where: E shift hourly productivity, hm2/h; Zo
shift operation area during the production assessment period, hm; g
shift operation time during the production assessment period, h. T
7.4 Machine assembly and appearance quality test method (19)
7.4.1 The strength grade of the fasteners bearing the load at the cutter shaft and gear box is: bolts shall not be less than grade 8.8, and nuts shall not be less than grade 8. The tightening torque shall comply with the provisions of Table 3 and be measured with a torque wrench. Table 3
Nominal diameter
Minimum value (min)
Tightening torque
Maximum value (max)
7.4.2 Transmission box cleanliness and sealing performance: The stubble crusher shall be tested for 30 minutes of idling within the operating speed range. The transmission system shall not make any abnormal noise during operation. After stopping, check the following items: a) After the lubricating oil of the transmission box is filtered with a 100-mesh filter, its impurity content is not more than 20mg/kW; b) There is no oil dripping on the dynamic joint surface of the box body, and no oil seepage on the static joint surface. 7.4.3 Temperature rise: The whole machine is connected to the test bench (it can be connected to the matching tractor if there is no condition), and the cutter shaft is idling for no less than 30 minutes within the working speed range. After stopping, check the temperature rise of the lubricating oil in the gear box and the bearing temperature rise. a) Use a thermometer with a range of 0~100℃ and an accuracy of ±1℃ to measure the temperature of the lubricating oil in the gear box before and after operation, and calculate the temperature rise. b) Use a point thermometer to measure the temperature of the bearing shell near the journal at both ends of the cutter shaft before and after operation, and calculate the bearing temperature rise. 7.4.4 Blade hardness: Take 3 blades from each machine, and grind two points of each blade with sandpaper in the blade hardness area, and measure it on the hardness tester. If there is a hard point or a soft point, it is allowed to make two more points within a radius of 10mm at the point. If the two points meet the requirements, it is determined that the point also meets the requirements. 8
7.4.5 The radius variation of the knife roller is ≤12mm.
JB/T8401.3—2001
7.4.6 The coating of the whole machine appearance should be uniform, flat, smooth and without exposed bottom. The coating thickness is greater than 35um, and the adhesion of the paint film reaches three levels of II.
8 Inspection rules
8.1 Inspection items
Any item that does not meet the requirements is unqualified. 8.1.1
8.1.2 According to the degree of influence on product quality, it is divided into Class A unqualified, Class B unqualified and Class C unqualified. The classification of unqualified items is shown in Table 4.
Classification of non-conforming items
8.2 Sampling method
Safety requirements
Stubble cutting depth
Stubble crushing rate
Mean time between failures
Root recommendation coverage
Power consumption
Average life of blade
Gearbox lubricating oil temperature rise
Bearing temperature rise
Transmission box cleanliness
Tightness of main fasteners
Sealing performance
Blade hardness
Roller radius variation
Appearance quality of the whole machine
Paint adhesion ability
Quality assessment indicators
All indicators shall comply with
the provisions of this standard
8.2.1 According to GB/T2828, randomly select products produced by the manufacturer in the last six months, with a sample size of 2 units. The product inspection batch shall not be less than 16 units. Sampling in users and markets is not subject to this limit, but it should be unused products. 8.2.2 When the ordering unit samples the product quality, it can be carried out in accordance with the provisions of GB/T2828. The qualified quality level and inspection batch shall be determined by negotiation between the supplier and the ordering party. If the contract stipulates, it shall be carried out in accordance with the contract. 8.2.3 For the factory inspection of products, the manufacturer may exempt or reduce the inspection of performance items according to its own product quality level. 8.3 Judgment rules
Evaluate each item one by one and judge by category. The lowest grade that can be achieved in each category shall be determined as the quality grade of the batch of products. See Table 5 for the determination array. 9
Sampling plan
Qualified products
Number of items
Inspection level
Sample code
Sample size
JB/T8401.32001
Instruction manual, marking, packaging, transportation and storageB
The contents of the instruction manual shall comply with the provisions of GB/T9480. The description of safety requirements and precautions shall fully reflect the dangerous characteristics of the product during use. 9.1
9.2 Each stubble crushing and returning machine shall be equipped with a fixed sign, the contents of which include: a) Product model and name:
b) Manufacturer name and detailed address:
c) Matching power;
d) Trademark;
e) Product factory number:
D Product factory date.
9.3 The appearance of the package should indicate the following items: a) Product name and model;
b) Name, quality, total number of packages and number of packages; c) Name and detailed address of the manufacturer;
d) Place of shipment and recipient.
9.4 Each root crusher shall be accompanied by the following documents when it leaves the factory: a) Quality inspection certificate;
b) Instructions for use and maintenance;
c) Packing list of the whole product.
9.5 Transportation
The ordering party and the manufacturer shall negotiate the transportation method according to the needs. 9.6 Storage
The whole machine shall be stored in a ventilated and dry place, and measures such as moisture-proof, sun-proof, rain-proof and snow-proof shall be taken. 101 Reliability Assessment
（17）
The timed truncation test method is adopted, and the total working time of each test sample is 110h. During the test, the working condition, failure condition and repair condition of each sample are recorded, and the mean time between failures (MTBF) and the mean life of the blade (MTTF) are calculated. 7.3.2 Mean Time Between Failures
MTBF=ET,/R.
Where: MTBF-mean time between failures, h:R.-the total number of general and serious failures that occurred during the production assessment period, and minor failures are not counted. (18)
If a major or fatal failure (referring to a personal injury accident, a failure that causes the machine to not work properly due to quality reasons, or a major economic loss) occurs during the production assessment period, the effectiveness and mean time between failures are both unqualified. 7.3.3 Pure working hour productivity
Continuously check the operation of the stubble crushing machine in three shifts, each shift operation is not less than 6 hours, and the time is accurate to min. 7
JB/T8401.3-2001
Where: E
Pure working hour productivity, hm/h:
Operation area of production check shift, hm2;
T—pure operation time of production check shift, h. 7.3.4 Shift hour productivity
Where: E shift hour productivity, hm2/h; Zo
Operation area of the shift during the production assessment, hm; g
Operation time of the shift during the production assessment, h. T
7.4 Test methods for assembly and appearance quality of the whole machine (19)
7.4.1 The strength grade of the fasteners bearing the load at the cutter shaft and gear box is: bolts shall not be less than grade 8.8, and nuts shall not be less than grade 8. The tightening torque shall comply with the provisions of Table 3 and be measured with a torque wrench. Table 3
Nominal diameter
Minimum value (min)
Tightening torque
Maximum value (max)
7.4.2 Cleanliness and sealing performance of the transmission box: The stubble crushing machine shall be tested for 30 minutes of idling within the operating speed range, and the transmission system shall not make any abnormal noise during operation. After stopping, check the following items: a) The impurity content of the transmission box lubricating oil after filtering with a 100-mesh filter shall not exceed 20 mg/kW; b) There shall be no oil dripping on the dynamic joint surface of the box body and no oil seepage on the static joint surface. 7.4.3 Temperature rise: The whole machine is connected to the test bench (it can be connected to the matching tractor if there is no condition), and the cutter shaft is idling for no less than 30 minutes within the working speed range. After stopping, check the temperature rise of the lubricating oil in the gearbox and the bearing temperature rise. a) Use a thermometer with a range of 0~100℃ and an accuracy of ±1℃ to measure the temperature of the lubricating oil in the gearbox before and after operation, and calculate the temperature rise. b) Use a point thermometer to measure the temperature of the bearing shell near the journal at both ends of the cutter shaft before and after operation, and calculate the bearing temperature rise. 7.4.4 Blade hardness: Take 3 blades from each machine, and sandpaper two points on each blade in the blade hardness area, and measure it on the hardness tester. If a hard point or a soft point is encountered, it is allowed to make two more points within a radius of 10mm at the point. If the two points meet the requirements, it is determined that the point also meets the requirements. 8
7.4.5 The radius change of the cutter roller is ≤12mm.
JB/T8401.3—2001
7.4.6 The coating of the whole machine appearance should be uniform in color, flat, smooth, and without exposed bottom. The coating thickness is greater than 35um, and the paint film adhesion reaches three-level II.
8 Inspection rules
8.1 Inspection items
Any item that does not meet the requirements is unqualified. 8.1.1
8.1.2 According to the degree of influence on product quality, it is divided into Class A unqualified, Class B unqualified and Class C unqualified. The classification of unqualified items is shown in Table 4.
Classification of non-conforming items
8.2 Sampling method
Safety requirements
Stubble cutting depth
Stubble crushing rate
Mean time between failures
Root recommendation coverage
Power consumption
Average life of blade
Gearbox lubricating oil temperature rise
Bearing temperature rise
Transmission box cleanliness
Tightness of main fasteners
Sealing performance
Blade hardness
Roller radius variation
Appearance quality of the whole machine
Paint adhesion ability
Quality assessment indicators
All indicators shall comply with
the provisions of this standard
8.2.1 According to GB/T2828, randomly select products produced by the manufacturer in the last six months, with a sample size of 2 units. The product inspection batch shall not be less than 16 units. Sampling in users and markets is not subject to this limit, but it should be unused products. 8.2.2 When the ordering unit samples the product quality, it can be carried out in accordance with the provisions of GB/T2828. The qualified quality level and inspection batch shall be determined by negotiation between the supplier and the ordering party. If the contract stipulates, it shall be carried out in accordance with the contract. 8.2.3 For the factory inspection of products, the manufacturer may exempt or reduce the inspection of performance items according to its own product quality level. 8.3 Judgment rules
Evaluate each item one by one and judge by category. The lowest grade that can be achieved in each category shall be determined as the quality grade of the batch of products. See Table 5 for the determination array. 9
Sampling plan
Qualified products
Number of items
Inspection level
Sample code
Sample size
JB/T8401.32001
Instruction manual, marking, packaging, transportation and storageB
The contents of the instruction manual shall comply with the provisions of GB/T9480. The description of safety requirements and precautions shall fully reflect the dangerous characteristics of the product during use. 9.1
9.2 Each stubble crushing and returning machine shall be equipped with a fixed sign, the contents of which include: a) Product model and name:
b) Manufacturer name and detailed address:
c) Matching power;
d) Trademark;
e) Product factory number:
D Product factory date.
9.3 The appearance of the package should indicate the following items: a) Product name and model;
b) Name, quality, total number of packages and number of packages; c) Name and detailed address of the manufacturer;
d) Place of shipment and recipient.
9.4 Each root crusher shall be accompanied by the following documents when it leaves the factory: a) Quality inspection certificate;
b) Instructions for use and maintenance;
c) Packing list of the whole product.
9.5 Transportation
The ordering party and the manufacturer shall negotiate the transportation method according to the needs. 9.6 Storage
The whole machine shall be stored in a ventilated and dry place, and measures such as moisture-proof, sun-proof, rain-proof and snow-proof shall be taken. 101 Reliability Assessment
（17）
The timed truncation test method is adopted, and the total working time of each test sample is 110h. During the test, the working condition, failure condition and repair condition of each sample are recorded, and the mean time between failures (MTBF) and the mean life span (MTTF) of the blade are calculated. 7.3.2 Mean Time Between Failures
MTBF=ET,/R.
Where: MTBF-mean time between failures, h:R.-the total number of general and serious failures that occur during the production assessment period, and minor failures are not counted. (18)
If a major or fatal failure (referring to a personal injury accident, a failure that causes the machine to not work properly due to quality reasons, or a major economic loss) occurs during the production assessment period, the effectiveness and mean time between failures are both unqualified. 7.3.3 Pure working hour productivity
Continuously check the operation of the stubble crushing machine in three shifts, each shift operation is not less than 6 hours, and the time is accurate to min. 7
JB/T8401.3-2001
Where: E
Pure working hour productivity, hm/h:
Operation area of production check shift, hm2;
T—pure operation time of production check shift, h. 7.3.4 Shift hour productivity
Where: E shift hour productivity, hm2/h; Zo
Operation area of the shift during the production assessment period, hm; g
Operation time of the shift during the production assessment period, h. T
7.4 Test method for assembly and appearance quality of the whole machine (19)
7.4.1 The strength grade of the fasteners bearing the load at the cutter shaft and gear box is: bolts shall not be less than grade 8.8, and nuts shall not be less than grade 8. The tightening torque shall comply with the provisions of Table 3 and be measured with a torque wrench. Table 3
Nominal diameter
Minimum value (min)
Tightening torque
Maximum value (max)
7.4.2 Cleanliness and sealing performance of the transmission box: The stubble crushing machine shall be tested for 30 minutes of idling within the operating speed range, and the transmission system shall not make any abnormal noise during operation. After stopping, check the following items: a) The impurity content of the transmission box lubricating oil after filtering with a 100-mesh filter shall not exceed 20 mg/kW; b) There shall be no oil dripping on the dynamic joint surface of the box body and no oil seepage on the static joint surface. 7.4.3 Temperature rise: The whole machine is connected to the test bench (it can be connected to the matching tractor if there is no condition), and the cutter shaft is idling for no less than 30 minutes within the working speed range. After stopping, check the temperature rise of the lubricating oil in the gearbox and the bearing temperature rise. a) Use a thermometer with a range of 0~100℃ and an accuracy of ±1℃ to measure the temperature of the lubricating oil in the gearbox before and after operation, and calculate the temperature rise. b) Use a point thermometer to measure the temperature of the bearing shell near the journal at both ends of the cutter shaft before and after operation, and calculate the bearing temperature rise. 7.4.4 Blade hardness: Take 3 blades from each machine, and grind two points of each blade with sandpaper in the blade hardness area, and measure it on the hardness tester. If there is a hard point or a soft point, it is allowed to make two more points within the radius of 10mm at the point. If the two points meet the requirements, it is determined that the point also meets the requirements. 8
7.4.5 The radius change of the cutter roller is ≤12mm.
JB/T8401.3—2001
7.4.6 The coating of the whole machine appearance should be uniform in color, flat, smooth, and without exposed bottom. The coating thickness is greater than 35um, and the paint film adhesion reaches three-level II.
8 Inspection rules
8.1 Inspection items
Any item that does not meet the requirements is unqualified. 8.1.1
8.1.2 According to the degree of influence on product quality, it is divided into Class A unqualified, Class B unqualified and Class C unqualified. The classification of unqualified items is shown in Table 4.
Classification of non-conforming items
8.2 Sampling method
Safety requirements
Stubble cutting depth
Stubble crushing rate
Mean time between failures
Root recommendation coverage
Power consumption
Average life of blade
Gearbox lubricating oil temperature rise
Bearing temperature rise
Transmission box cleanliness
Tightness of main fasteners
Sealing performance
Blade hardness
Roller radius variation
Appearance quality of the whole machine
Paint adhesion ability
Quality assessment indicators
All indicators should comply with
the provisions of this standard
8.2.1 According to GB/T2828, randomly select products produced by the manufacturer in the last six months, with a sample size of 2 units. The product inspection batch shall not be less than 16 units. Sampling in users and markets is not subject to this limit, but it should be unused products. 8.2.2 When the ordering unit samples the product quality, it can be carried out in accordance with the provisions of GB/T2828. The qualified quality level and inspection batch shall be determined by negotiation between the supplier and the ordering party. If the contract stipulates, it shall be carried out in accordance with the contract. 8.2.3 For the factory inspection of products, the manufacturer may exempt or reduce the inspection of performance items according to its own product quality level. 8.3 Judgment rules
Evaluate each item one by one and judge by category. The lowest grade that can be achieved in each category shall be determined as the quality grade of the batch of products. See Table 5 for the determination array. 9
Sampling plan
Qualified products
Number of items
Inspection level
Sample code
Sample size
JB/T8401.32001
Instruction manual, marking, packaging, transportation and storageB
The contents of the instruction manual shall comply with the provisions of GB/T9480. The description of safety requirements and precautions shall fully reflect the dangerous characteristics of the product during use. 9.1
9.2 Each stubble crushing and returning machine shall be equipped with a fixed sign, the contents of which include: a) Product model and name:
b) Manufacturer name and detailed address:
c) Matching power;
d) Trademark;
e) Product factory number:
D Product factory date.
9.3 The following items should be marked on the outside of the package: a) Product name and model:
b) Name, quality, total number of packages and number of packages: c) Name and detailed address of the manufacturer;
d) Place of shipment and recipient.
9.4 Each root crusher shall be accompanied by the following documents when it leaves the factory: a) Quality inspection certificate:
b) Instructions for use and maintenance;
c) Packing list of the whole product.
9.5 Transportation
The orderer and the manufacturer shall negotiate the transportation method according to the needs. 9.6 Storage
The whole machine should be stored in a ventilated and dry place, and measures such as moisture-proof, sun-proof, rain-proof and snow-proof shall be taken. 102 Cleanliness and sealing performance of the transmission box: The stubble crushing and returning machine should be tested for 30 minutes of idling within the working speed range, and the transmission system should not make abnormal noises during operation. Check the following items after stopping: a) After the lubricating oil of the transmission box is filtered with a 100-mesh filter, its impurity content is not more than 20mg/kW; b) There is no oil dripping on the dynamic joint surface of the box body, and no oil seepage on the static joint surface. 7.4.3 Temperature rise: The whole machine is connected to the test bench (it can be connected to the matching tractor if there is no condition), and the cutter shaft is idling for no less than 30 minutes within the working speed range. After stopping, check the temperature rise of the lubricating oil and the bearing in the gear box. a) Use a thermometer with a range of 0~100℃ and an accuracy of ±1℃ to measure the temperature of the lubricating oil in the gear box before and after operation, and calculate the temperature rise. b) Use a point thermometer to measure the temperature of the bearing shell near the journal at both ends of the cutter shaft before and after operation, and calculate the bearing temperature rise. 7.4.4 Blade hardness: Take 3 blades from each machine, and sand each blade at two points in the blade hardness area with sandpaper, and measure it on the hardness tester. In case of hard or soft points, it is allowed to make two more points within the radius of 10mm at the point. If the two points meet the requirements, it is determined that the point also meets the requirements. 8
7.4.5 The radius variation of the knife roller is ≤12mm.
JB/T8401.3—2001
7.4.6 The coating of the whole machine appearance should be uniform, flat, smooth, and without exposed bottom. The coating thickness is greater than 35um, and the adhesion of the paint film reaches level II at three locations.
8 Inspection rules
8.1 Inspection items
Any item that does not meet the requirements is unqualified. 8.1.1
8.1.2 According to the degree of influence on product quality, it is divided into Class A unqualified, Class B unqualified and Class C unqualified. The classification of unqualified projects is shown in Table 4.
Classification of non-conforming items
8.2 Sampling method
Safety requirements
Stubble cutting depth
Stubble crushing rate
Mean time between failures
Root recommendation coverage
Power consumption
Average life of blade
Gearbox lubricating oil temperature rise
Bearing temperature rise
Transmission box cleanliness
Tightness of main fasteners
Sealing performance
Blade hardness
Roller radius variation
Appearance quality of the whole machine
Paint adhesion ability
Quality assessment indicators
All indicators should comply with
the provisions of this standard
8.2.1 According to GB/T2828, randomly select products produced by the manufacturer in the last six months, with a sample size of 2 units. The product inspection batch shall not be less than 16 units. Sampling in users and markets is not subject to this limit, but it should be unused products. 8.2.2 When the ordering unit samples the product quality, it can be carried out in accordance with the provisions of GB/T2828. The qualified quality level and inspection batch shall be determined by negotiation between the supplier and the ordering party. If the contract stipulates, it shall be carried out in accordance with the contract. 8.2.3 For the factory inspection of products, the manufacturer may exempt or reduce the inspection of performance items according to its own product quality level. 8.3 Judgment rules
Evaluate each item one by one and judge by category. The lowest grade that can be achieved in each category shall be determined as the quality grade of the batch of products. See Table 5 for the determination array. 9
Sampling plan
Qualified products
Number of items
Inspection level
Sample code
Sample size
JB/T8401.32001
Instruction manual, marking, packaging, transportation and storageB
The contents of the instruction manual shall comply with the provisions of GB/T9480. The description of safety requirements and precautions shall fully reflect the dangerous characteristics of the product during use. 9.1
9.2 Each stubble crushing and returning machine shall be equipped with a fixed sign, the contents of which include: a) Product model and name:
b) Manufacturer name and detailed address:
c) Matching power;
d) Trademark;
e) Product factory number:
D Product factory date.
9.3 The following items should be marked on the outside of the package: a) Product name and model:
b) Name, quality, total number of packages and number of packages: c) Name and detailed address of the manufacturer;
d) Place of shipment and recipient.
9.4 Each root crusher shall be accompanied by the following documents when it leaves the factory: a) Quality inspection certificate:
b) Instructions for use and maintenance;
c) Packing list of the whole product.
9.5 Transportation
The orderer and the manufacturer shall negotiate the transportation method according to the needs. 9.6 Storage
The whole machine should be stored in a ventilated and dry place, and measures such as moisture-proof, sun-proof, rain-proof and snow-proof shall be taken. 102 Cleanliness and sealing performance of the transmission box: The stubble crushing and returning machine should be tested for 30 minutes of idling within the working speed range, and the transmission system should not make abnormal noises during operation. Check the following items after stopping: a) After the lubricating oil of the transmission box is filtered with a 100-mesh filter, its impurity content is not more than 20mg/kW; b) There is no oil dripping on the dynamic joint surface of the box body, and no oil seepage on the static joint surface. 7.4.3 Temperature rise: The whole machine is connected to the test bench (it can be connected to the matching tractor if there is no condition), and the cutter shaft is idling for no less than 30 minutes within the working speed range. After stopping, check the temperature rise of the lubricating oil and the bearing in the gear box. a) Use a thermometer with a range of 0~100℃ and an accuracy of ±1℃ to measure the temperature of the lubricating oil in the gear box before and after operation, and calculate the temperature rise. b) Use a point thermometer to measure the temperature of the bearing shell near the journal at both ends of the cutter shaft before and after operation, and calculate the bearing temperature rise. 7.4.4 Blade hardness: Take 3 blades from each machine, and sand each blade at two points in the blade hardness area with sandpaper, and measure it on the hardness tester. In case of hard or soft points, it is allowed to make two more points within the radius of 10mm at the point. If the two points meet the requirements, it is determined that the point also meets the requirements. 8
7.4.5 The radius variation of the knife roller is ≤12mm.
JB/T8401.3—2001
7.4.6 The coating of the whole machine appearance should be uniform, flat, smooth, and without exposed bottom. The coating thickness is greater than 35um, and the adhesion of the paint film reaches level II at three locations.
8 Inspection rules
8.1 Inspection items
Any item that does not meet the requirements is unqualified. 8.1.1
8.1.2 According to the degree of influence on product quality, it is divided into Class A unqualified, Class B unqualified and Class C unqualified. The classification of unqualified projects is shown in Table 4.
Classification of non-conforming items
8.2 Sampling method
Safety requirements
Stubble cutting depth
Stubble crushing rate
Mean time between failures
Root recommendation coverage
Power consumption
Average life of blade
Gearbox lubricating oil temperature rise
Bearing temperature rise
Transmission box cleanliness
Tightness of main fasteners
Sealing performance
Blade hardness
Roller radius variation
Appearance quality of the whole machine
Paint adhesion ability
Quality assessment indicators
All indicators shall comply with
the provisions of this standard
8.2.1 According to GB/T2828, randomly select products produced by the manufacturer in the last six months, with a sample size of 2 units. The product inspection batch shall not be less than 16 units. Sampling in users and markets is not subject to this limit, but it should be unused products. 8.2.2 When the ordering unit samples the product quality, it can be carried out in accordance with the provisions of GB/T2828. The qualified quality level and inspection batch shall be determined by negotiation between the supplier and the ordering party. If the contract stipulates, it shall be carried out in accordance with the contract. 8.2.3 For the factory inspection of products, the manufacturer may exempt or reduce the inspection of performance items according to its own product quality level. 8.3 Judgment rules
Evaluate each item one by one and judge by category. The lowest grade that can be achieved in each category shall be determined as the quality grade of the batch of products. See Table 5 for the determination array. 9
Sampling plan
Qualified products
Number of items
Inspection level
Sample code
Sample size
JB/T8401.32001
Instruction manual, marking, packaging, transportation and storageB
The contents of the instruction manual shall comply with the provisions of GB/T9480. The description of safety requirements and precautions shall fully reflect the dangerous characteristics of the product during use. 9.1
9.2 Each stubble crushing and returning machine shall be equipped with a fixed sign, the contents of which include: a) Product model and name:
b) Manufacturer name and detailed address:
c) Matching power;
d) Trademark;
e) Product factory number:
D Product factory date.
9.3 The following items should be marked on the outside of the package: a) Product name and model:
b) Name, quality, total number of packages and number of packages: c) Name and detailed address of the manufacturer;
d) Place of shipment and recipient.
9.4 Each root crusher shall be accompanied by the following documents when it leaves the factory: a) Quality inspection certificate:
b) Instructions for use and maintenance;
c) Packing list of the whole product.
9.5 Transportation
The orderer and the manufacturer shall negotiate the transportation method according to the needs. 9.6 Storage
The whole machine should be stored in a ventilated and dry place, and measures such as moisture-proof, sun-proof, rain-proof and snow-proof shall be taken. 103 The appearance of the package should indicate the following items: a) Product name and model:
b) Name, quality, total number of packages and number of packages: c) Name and detailed address of the manufacturer;
d) Place of shipment and recipient.
9.4 Each root crusher shall be accompanied by the following documents when it leaves the factory: a) Quality inspection certificate:
b) Instructions for use and maintenance;
c) Packing list of the whole product.
9.5 Transportation
The orderer and the manufacturer shall negotiate the transportation method according to the needs. 9.6 Storage
The whole machine shall be stored in a ventilated and dry place, and measures such as moisture-proof, sun-proof, rain-proof and snow-proof shall be taken. 103 The appearance of the package should indicate the following items: a) Product name and model:
b) Name, quality, total number of packages and number of packages: c) Name and detailed address of the manufacturer;
d) Place of shipment and recipient.
9.4 Each root crusher shall be accompanied by the following documents when it leaves the factory: a) Quality inspection certificate:
b) Instructions for use and maintenance;
c) Packing list of the whole product.
9.5 Transportation
The orderer and the manufacturer shall negotiate the transportation method according to the needs. 9.6 Storage
The whole machine shall be stored in a ventilated and dry place, and measures such as moisture-proof, sun-proof, rain-proof and snow-proof shall be taken. 10
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