Some standard content:
ICS. 65. 060.20
B91
JB
Machine Industry Standard of the People's Republic of China
JB/T6678-2001
Straw crushing and returning machine|| tt||Smashed strawmachine
2001-06-22 Release
China Machinery Industry Federation
Release
2001-10-01 Implementation
JB/ T6678-2001 | "Revision of crushing straw and returning it to the field." This standard modifies the main content of straw crushing and returning to fields in JB/T6678~6679-1993 and JB/T8401.3-~1996 as follows; adds a method to express the product model:
adds and modifies the main performance of the product Index requirements; revised the technical requirements for main parts and components; revised the technical requirements for the complete machine;
Modified the product safety requirements:
Modified part of the test method;
Added Product inspection item classification:
- Added judgment rules:
Added provisions for product instructions for use; revised the expressions of some terms. This standard will replace JB/T6678-6679-1993 and JB/T8401.3-1996 from the date of implementation. This standard is proposed and administered by the National Agricultural Machinery Standardization Technical Committee. The organization responsible for drafting this standard: Chinese Academy of Agricultural Mechanization Sciences. The organization participating in the drafting of this standard: Xuchang County Agricultural Machinery General Factory. The main drafters of this standard: Liu Yundong, Yang Juntai, Bai Yucheng, Han Genfa, Gao Erguang, Yang Zhaowen. JB/T6678~66791993 was first released in 1993, and JB/T8401.3--1996 was first released in 1996. This is the first revision and merger.
1 scope
Machine Industry Standard of the People's Republic of China
Straw crushing and returning machine
Smashed straw machine
JB/T66782001
Replacement JB/T6678-66791993
JB/T 8401.3—1995
This standard specifies the product quality evaluation indicators, technical requirements, safety requirements, test methods and inspection rules for straw crushing and returning machines. This standard applies to straw crushing and returning machines that mainly crush corn, wheat, watermelon, sorghum and other crop straws. 2
Quoted standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T 275—1993
GB/T 699—1999
GB/T 1144—1987
GB/T 1184—1996
GB/T1804—2000| |tt||GB/T 2828—1987
GB/T 3077—1999
GB/T 3098.1—2000
GB/T3098.2—2000
GB /T 3478.1—1995
GB/T 9239—1988
GB/T 9439—1988
GB/T 9480-2001
GB/T 10095—1988| |tt||GB 10395.1—2001
GB 10395.5—1996
GB 10396—1999
GB/T 11357-1989
GB/T 11365—1989|| tt||GB/T 17126—1997
JB/T 5673—1991
JB/T 8574—1997
JB/T 97911999
Rolling bearings with shafts and housings Fit
High-quality carbon structural steel
Rectangular spline dimensions, tolerances and inspections
Shape and position tolerances without tolerance values
General tolerances without tolerances Tolerances of linear and angular dimensions Batch-by-batch inspection and counting Sampling procedures and sampling tables (applicable to inspection of consecutive batches) Alloy structural steel
Fasteners Mechanical properties Bolts, screws and studs Fasteners Mechanical properties Nuts|| tt||Cylindrical straight tooth involute spline module Basic gear gallery tolerance Rigid rotor balance quality Determination of allowable unbalance Gray cast iron parts
Rules for writing instruction manuals for agricultural and forestry tractors and machinery, grassland and gardening power machinery Zhekai Line Cylindrical Gear Accuracy
Safety Technical Requirements for Agricultural and Forestry Tractors and Machinery Part 1: General Safety Technical Requirements for Agricultural and Forestry Tractors and Machinery Part 5: Driven Farming Machinery Agricultural and Forestry Tractors and Machinery, Lawn and Garden Power Machinery Safety Signs and General principles of hazardous graphics Material of pulleys, surface roughness and accuracy of balance bevel gears and hypoid gears
Agricultural tractors and machinery power output universal joint drive shaft and power input connection device position of agricultural and forestry tractors and machinery General technical conditions for painting Agricultural machinery product model preparation rules
Agricultural machinery universal joint drive shaft safety protective cover China Machinery Industry Federation approved 2001-06-22 and implemented on 2001-10-01
Product model Representation method
The product model is compiled according to JB/T8574.
Straw crusher product model representation method: 1JH
JB/T6678—2001
Improvement code
Main parameters: working width, cm
Straw Type
Classification code: Indicates land preparation machinery, straw crushing and returning machine. Improvement code: Prototype is not marked: Improved type is marked with letters A, B..., the first improvement is marked A, and the second improvement is marked Mark B. And so on.
Straw type: general type. Not marked: corn, wheat, water tank, sorghum and other straw-specific crushing and returning machines are marked with the first letter of the Chinese Pinyin text. If there are duplicates, the second or subsequent letters can be selected. Marking example:
The straw crushing and returning machine with a working width of 160cm and suitable for crushing and returning corn stalks to the field is represented as: 1JHY-160
4 Technical requirements
4.1 Main performance indicators| |tt||4.1.1 The qualified length for crushing corn, sorghum and other crop straws shall not be greater than 100mm, and the qualified length for crushing wheat, rice and other crop straws shall not be greater than 150mm.
4.1.2 When operating at rated productivity, the main performance indicators of the straw crushing and returning machine matched with the tractor should comply with the provisions of Table 1, and the main performance indicators of the straw crushing and returning machine matched with the harvester should comply with Table 2 Provisions. Table 1
Item
Qualification rate of crushing length of stuck stalks during rotation
Qualification rate of crushing length of straw during rotation
Average height of stubble between rotations||tt ||Average height of stubble in wheel
Unevenness of straw batch spreading
Pure productivity
Item
Qualification rate of straw crushing length
cum stubble Average height
Uneven hook of fine consumption
2
mesh
mesh
%
%
mm
mm
%
hm/ (m · h)
Table 2
%
mm
%| |tt||refers to
standard
92
>85
≤75
85
≤20
≥ 0.33
Indicator
>85
≤80
≤30
4.1.3 Use reliability should comply with the provisions of Table 3. Item
Mean Time Between Failures (MTBF)
Mean Life of Crushing Knife (MTTF)
4.2 General Technical Requirements
JB/T6678-2001
Table 3
month
h
4.2.1 The straw crushing and returning machine should be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.2.2 The tolerance level of dimensions without tolerances should be selected according to GB/T1804-c. 4.2.3 Shape and position tolerances not noted should be selected in accordance with GB/T1184-K. 4.2.4 Processed parts need to be chamfered with sharp angles, and gas-cut parts need to be ground flat. 4.3 Technical requirements for main parts and components
means
standard
≥60
100
4.3.1 The gear box should be made of mechanical properties not less than Made of HT200 gray cast iron material specified in GB/T9439. 4.3.2 Gears should be made of 20CrMnTi material with mechanical properties not lower than those specified in GB/T3077. The tooth surface must be carburized. The thickness of the carburized layer is 10%~15% of the gear module. The heat treatment hardness of the tooth surface in the fire zone is 58-64HRC, and the core hardness is 33-45HRC. The accuracy of the gear plus T. should comply with the relevant regulations in GB/T10095 and GB/T11365. 4.3.3 The material of the pulley and the determination of the allowable imbalance should comply with the regulations in GB/T11357. 4.3.4 Spline shaft
4.3.4.1 The spline shaft is made of 40Cr material with mechanical properties not lower than those specified in GB/T3077. The overall hardness is 240269HB.
4.3.4.2 The dimensions, tolerances and inspection of rectangular splines shall comply with the relevant regulations in GB/T1144. 4.3.4.3 The module, basic teeth and tolerances of involute splines shall comply with the relevant provisions in GB/T3478.1. 4.3.5 The matching tolerances of rolling bearings, shafts and housings should comply with the relevant regulations in GB/T275. 4.3.6 Welding of the cutter shaft
4.3.6.1 After the cutter shaft and the cutter seat are combined, they should be heat treated to eliminate internal stress. 4.3.6.2 The coaxiality of the journals at both ends of the cutter shaft and the bearings is recommended to be selected according to level 8 in GB/T1184. 4.3.7 Crushing knife pin
4.3.7.1 The grinding knife pin is made of 45 steel material with mechanical properties not lower than those specified in GB/T699. 4.3.7.2 The crushing knife pin shaft must be heat treated, and the surface hardness is 38-45HRC. 4.3.8 Crushing knife
4.3.8.1
The grinding knife should be made of 65Mn steel material with mechanical properties not lower than those specified in GB/T699. 4.3.8.2 The crushing knife must be heat treated. The surface heat treatment hardness is 48~56HRC and the core hardness is 33-40HRC. 4.3.8.3 Crushing knives should be classified according to weight before assembly. The weight difference between blades of the same weight should not be greater than 10g. 4.4 Universal joint drive shaft
4.4.1 Power universal joint drive shaft and power input connection device shall comply with the relevant regulations in GB/T17126. It is recommended to use type A for the universal joint drive shaft.
4.4.2 The protective cover of the universal joint drive shaft shall comply with the relevant regulations in JB/T9791. 4.5 Assembly technical requirements
JB/T6678—2001
4.5.1 All parts and components must pass inspection, and purchased parts and outsourced parts must have inspection certificates before they can be assembled. 4.5.2 The strength level of the tight peripheral parts that bear load at the cutter shaft and gear box is: the bolts are not lower than level 8.8 specified in GB/T3098.1, and the nuts are not lower than level 8 specified in GB/T3098.2. 4.6 Technical requirements for the complete machine
4.6.1 The same cutter shaft should be equipped with blades of the same weight. After the cutter shaft and blade are assembled, a dynamic balance test should be carried out in accordance with the provisions of GB/T9239. The balance accuracy is G6.3.
4.6.2 After each straw crushing and returning machine is assembled, a 30-minute dry running test should be conducted within the working speed range of the cutter shaft. The operation should be smooth, and the system should not have jams, bumps, or abnormal noises. After parking, check the following items: a) Tightness: All connections and fasteners must not be loose. b) Oil temperature: Within the specified oil position range, the temperature rise of the lubricating oil in the gear box shall not exceed 25°C. c) The temperature rise of the bearing seat and bearing parts shall not exceed 30°C. d) Sealing: No leakage or oil leakage is allowed.
4.6.3 Painting should comply with the relevant regulations of JB/T5673. The exterior coating of the entire machine should be uniform in color, flat, smooth, and without exposed bottom. The coating thickness is greater than 35 μm, and the paint film adhesion reaches three levels of II. 4.6.4 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., and anti-rust measures should be taken. 5 Safety requirements
5.1 The universal joint drive shaft should have a reliable safety protection device, and the protection method should comply with the provisions of GB10395.1--2001 on the universal joint drive shaft in 12.3.
5.2 The protection at the top, rear, front and end of the straw crushing and returning machine should comply with the corresponding provisions of 4.1, 4.2, 4.3 and 4.4 in GB10395.5-1996.
5.3 The side belt transmission device should be equipped with a reliable protective cover. The holes and nets on the protective cover, their gaps or diameters and safety distances should comply with the relevant requirements in Tables 3 and 4 of GB10395.1-2001. According to regulations, the safety shield should comply with the relevant provisions of JB/T9791. 5.4 Safety signs
5.4.1 Safety signs should comply with the regulations of GB10396. 5.4.2 Use warning signs to address the following potential dangers: a) The universal joint drive shaft at the front of the machine may shrink around the body. When the machine is operating or the universal joint drive shaft is rotating, people should keep a safe distance from the machine: ||tt ||b) If objects fly out from the rear of the machine and impact the entire body, people should keep a safe distance from the machine during operation: c) When the machine is running, the safety shield must not be opened or removed. 5.4.3 Use caution signs, describing the following: a) Please read the instruction manual carefully before operation and maintenance; b) Before use, you must check the condition of the grinding knife pin shaft; c) During maintenance, cut off the power and reliably support the machine. 6 Test method
6.1 Performance test
6.1.1 Test preparation
6.1.1.1 Test prototype preparation
JB/T66782001
The test prototype should be manufactured with The instruction manual provided by the factory is consistent, the inspection is qualified, and the technical condition is in good condition. 6.1.1.2 Preparation of test instruments and equipment
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. Comparative tests should be conducted under the same conditions.
6.1.1.3 Preparation of supporting tractor
The supporting pulling machine should be in good condition, and the tractor wheelbase and rated speed of the power output shaft should meet the design requirements of supporting products. 6.1.1.4 Test site selection
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 no less than the working width of the straw crushing and returning machine. 6 times.
6.1.2 Test site investigation
6.1.2.1 Soil moisture content determination
Sample five points on the diagonal of the test site. Each measurement point is sampled in layers of 10cm. Use soil Take 0~10cm and 10~20cm soil from the box respectively. The sampling amount 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 respectively to find out the soil of each layer. Moisture content (absolute), average moisture content of each layer, average moisture content of the whole layer, or measured with a soil moisture meter. Soil moisture content of each layer:
Where: H. Moisture content of soil pile:
Ma-M
H
Ms, M—wet soil, dry soil Mass, g. 6.1.2.2 Soil solidity measurement
M
layer and full layer average. 6.1.2.3 Determination of straw moisture content and yield
()
Sample five points on the diagonal of the test site, and the weight of the straw picked up at each point is not less than 50g (at the fine stalk distance) Take samples at the same height on the ground, such as corn 50cm, wheat 30cm, etc.), weigh the wet weight, and then weigh the dry weight after drying to calculate the moisture content of the refined straw. Pick up the stalks within an area of ??1mx1m at each point (the upright stalks are the part above 8cm from the ground surface, and all floating stubble will be counted), and weigh them. Find the average of the five points and calculate the output per metric item.
Straw moisture content:
Mi -Mi
x100%.
H=
M
Where: H—water content of straw Rate:
M., M.—wet weight and dry weight of sampled straw, g. Straw yield per hectare (wet):
M×2000
In the formula: W - Straw yield per hectare (pot), kg/hm2: Straw mass within 1m of point i, kg.
Output of straw per public item (thousands):
·(2)
(3)
JB/T6678—2001
wW||tt ||In the formula: W—The output of straw per metric item (dry), kg/hm. 6.1.3 Operation performance measurementbZxz.net
6.1.3.1 Test conditions
1+H
(4)
The test unit should advance according to the minimum forward speed and design required in the instruction manual Speed, maximum forward speed and full width operation. Each forward speed is a test working condition, there are three test working conditions in total, and two strokes are measured in each working condition. Product quality inspection and prototype comparison testing can be carried out according to the design forward speed working condition.
6.1.3.2 Height of stubble between turns
Measure two points between the wheel tracks in the length direction of the measurement area during each trip, and measure the height of straw stubble within the range of 1m×1m at each point. Calculate the average stubble height for each point and working condition.
6.1.3.3 Height of stubble in the wheel tracks
Measure one point each in the left and right turns in the length direction of the measurement area, and measure the height of the stubble in the b×2m range ( b wheel withdrawal width), calculate the average stubble height at each point and working condition. 6.1.3.4 Qualification rate of straw crushing length between rounds. For each stroke, three points are measured at equal intervals between turns in the length direction of the measurement area. An area of ??1m2 is randomly measured at each point, and all straw is picked up and weighed. Pick out the straw with unqualified crushing length (the crushing length of the straw does not include the bast fibers at both ends) and weigh it. Calculate the passing rate of straw crushing length at each point and the average value of working conditions. Each point (1.2., 6):
Working condition:
Where: F-
F.
M-Mr
M|| tt ||S ||tt || The mass of unqualified straw, kg; F
-the passing rate of straw crushing length under working conditions.
6.1.3.5 Qualification rate of refined straw crushing length in wheel track 6
x100%
(5)
(6)
Each stroke is in Measure three points at regular intervals in the wheel tracks along the length of the measurement area (at least one measuring point in the left and right wheel tracks), and measure the area b × 2m at each point (b-wheel width). The measurement method is the same as 6.1.3.4. 6.1.3.6 The degree of uneven straw throwing is measured at the same time as the qualified rate of fine straw crushing length, and the measurement method is the same. m.
M
6
(7)
F
JB/T6678—2001
2(mm)||tt ||M
Where: M——The average mass of straw at each point in the measurement area, kg; F——The unevenness of throwing.
6.1.4 Power index determination
5
1000
(8)
The power consumption of the straw crushing and returning machine is determined by the driving power consumption and traction power Consumption consists of two parts. It is recommended to use the electrical measurement method for driving power consumption. The torque and speed of the tractor's power output shaft are measured simultaneously during the entire stroke to calculate the driving power consumption. To measure the traction power consumption, the vehicle-to-vehicle method can be used to measure the traction force, measure the forward speed, and calculate the traction power consumption. The tractor driving wheel power consumption can also be calculated by measuring the tractor driving wheel driving torque and speed. Traction power consumption:
N,=(P,-P,)V×10-
Working part driving power consumption
N.
Tractor driving wheel power consumption :
Total power consumption of the machine:
N,
where: N..
M,n
3'
M ,n
3
or
-total power consumption of the machine tool, kW;
-universal drive shaft drive power consumption, kW;
N| |tt||x ??10-4
X10
Mono
N=N, + N
N=N, + N
N—— When measuring the traction force, the power consumption of the traction force of the implement, kW; N --- the power consumption of the tractor driving wheel, kW; M -- the drive torque of the universal drive shaft, N·m; n, --- the rotation speed of the universal drive shaft, r/ min: P, tractor traction force when the machine is operating, N: P'—tractor no-load traction force, N:
—machine operating speed, m/s
M—tractor drive when the machine is operating Wheel torque, N·mM
Driving wheel torque when the tractor is no-load, N·m; n---tractor driving wheel speed when the implement is operating, r/min; no
One tractor is empty When loading, the driving wheel speed, r/min. 6.1.5 Pure productivity
Determine the time each stroke unit passes through the testing area, and calculate the pure productivity: 0.36L
Ech
r
Where: Esh—|| tt||Pure productivity, hm2/(m·h);
(9)
.(10)
(11)
·(12)|| tt||.(13)
·(14)
7
n
3
or
- total power consumption of the machine, kW;
- universal drive shaft drive power consumption, kW;
N|| tt||x ??10-4
When pulling force, the power consumption of the traction force of the implement, kW; N --- the power consumption of the tractor drive wheel, kW; M -- the drive torque of the universal drive shaft, N·m; n, --- the rotation speed of the universal drive shaft, r/min :P, the tractor traction force when the implement is operating, N: P'—tractor no-load traction force, N:
—the operating speed of the implement, m/s
M—the tractor driving wheel when the implement is operating Torque, N·mM
Driving wheel torque when the tractor is no-load, N·m; n---tractor driving wheel speed when the implement is operating, r/min; no
One tractor is no-load When, the driving wheel speed, r/min. 6.1.5 Pure productivity
Determine the time each stroke unit passes through the testing area, and calculate the pure productivity: 0.36L
Ech
r
Where: Esh—|| tt||Pure productivity, hm2/(m·h);
(9)
.(10)
(11)
·(12)|| tt||.(13)
·(14)
7
n
3
or
- total power consumption of the machine, kW;
- universal drive shaft drive power consumption, kW;
N|| tt||x ??10-4
When pulling force, the power consumption of the traction force of the implement, kW; N --- the power consumption of the tractor drive wheel, kW; M -- the drive torque of the universal drive shaft, N·m; n, --- the rotation speed of the universal drive shaft, r/min :P, the tractor traction force when the implement is operating, N: P'—tractor no-load traction force, N:
—the operating speed of the implement, m/s
M—the tractor driving wheel when the implement is operating Torque, N·mM
Driving wheel torque when the tractor is no-load, N·m; n---tractor driving wheel speed when the implement is operating, r/min; no
One tractor is no-load When, the driving wheel speed, r/min. 6.1.5 Pure productivity
Determine the time each stroke unit passes through the testing area, and calculate the pure productivity: 0.36L
Ech
r
Where: Esh—|| tt||Pure productivity, hm2/(m·h);
(9)
.(10)
(11)
·(12)|| tt||.(13)
·(14)
7
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