Some standard content:
QB/T2419—1998
This standard is a revision of ZBY91017—1990 "ZCQ2~3 Type Knife Roller Grass Cutter". The technical content has been revised as follows: The original ZBY91017—1990 "ZCQ2~3 Type Knife Roller Grass Cutter" only has two models: ZCQ2 (production capacity 4t/h~5t/h) and ZCQ3 (production capacity 7t/h~8t/h). In recent years, the production scale of pulp and paper mills has been continuously expanded, and the production capacity of the original two models of grass cutters can no longer meet the production needs. The grass cutter with a production capacity of 12 t/h~15t/h (ZCQ4) has been trial-produced and the trial effect is good. The ZCQ4 grass cutter product has gradually matured. When revising the industry standard this time, this model will be included in the revised standard. In order to reduce the vibration of the equipment, reduce the noise and improve the working environment, the accuracy level of the shape and position tolerance of the cutter roller shaft has been appropriately improved, and the residual unbalance of the cutter roller rotation has been appropriately reduced.
When the production capacity of the original standard test method is measured, the moisture content of the grass is greater than or less than 20%, and it is converted to 20%. When revising this standard, considering that the production capacity of the grass cutter has a certain range, and the actual measurement cycle of the grass moisture content is relatively long, the grass weight is also calculated by actual weighing. Therefore, the conversion calculation method was cancelled when the standard was revised. From the date of implementation, this standard will replace the professional standard ZBY91017-1990 issued by the former Ministry of Light Industry. This standard is proposed by the Industry Management Department of the State Bureau of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. The drafting unit of this standard: Zhenjiang Light Industry Machinery Factory. The main drafter of this standard: Kang Licheng.
1 Scope
Light Industry Standard of the People's Republic of China
Roller Grass Cutter
QB/T 2419--1998
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of roller grass cutters (hereinafter referred to as "grass cutters").
This standard applies to ZCQ2~4 type grass cutters for cutting grass raw materials in pulp and paper mills. 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 version of the following standards. GL191-1990 Pictorial symbols for packaging, storage and transportation
GE/T 699--1988
Technical conditions for high-quality carbon structural steel
GI3/T1801~-1979Tolerance and fit dimensions up to 500mm hole, shaft tolerance zone and fitGB/T 1958—1980
Shape and position tolerance testing regulations
GB/T 11352—1989
Casting carbon steel parts for general engineering
GB/T 13306-1991
GB/T 14253—1993
General technical conditions for light industrial machinery
GB/T 16769—1997
Q/T1565—1992
Method for measuring the sound pressure level of noise from metal cutting machine tools Roller cutter knife
QB/T 1588.1--1992
General technical conditions for welding parts of light industrial machinery
QB/T 1588.2-—1992
General technical conditions for cutting parts
Light industrial machinery
QB/T 1588. 3--1992
General technical conditions for assembly of light industrial machinery
QB/T 1588.4-1993
General technical conditions for painting of light industrial machinery
QB/T 1588.5—1996
3 Product classification
3.1 Type
General technical conditions for light industry machinery packaging
3.1.1 The grass cutter should be made into a structural type consisting of feeding, feeding, dust collection and discharging. 3.1.2 The grass cutter is divided into two types according to the position of the transmission mechanism: left-hand machine (Z type) and right-hand machine (Y type). Facing the discharging port, the transmission is placed on the left side for the left hand machine, and vice versa for the right hand machine. 3.2 Model
The grass cutter model is ZCQ24, which means: Approved by the State Bureau of Light Industry on November 25, 1998
Implemented on June 1, 1999
3.3 Basic parameters
The basic parameters of the grass cutter are shown in Table 1.
Production capacity, t/h
Actual cutting length of grass blade, mm
Rotating diameter and length of flying knife blade, mm
Roller speed, r/min
Number of flying knives, piece
Number of bottom knives. piece
Main motor power, kw
4 Technical requirements
General requirements
QB/T 2419--1998
-Series sequence number
Product classification code (cutting machine)
Product category code (forage preparation)
-Papermaking industry code
$430×690
4.1.1 Grass cutters shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved in the prescribed procedures. 4.1.2 The manufacture of lawn mowers shall comply with the provisions of GB/T14253. 4.1.3 Welded parts shall comply with the provisions of QB/T1588.1. Cutting parts shall comply with the provisions of QB/T1588.2. 4.1.4
4.1.5 The bottom knife and flying knife shall comply with the provisions of QB/T1565. 4.2 Product performance
4.2.1 The production capacity shall comply with the provisions of Table 1. 4.2.2 The qualified rate of grass pieces shall not be less than 80%.
Note: The qualified rate of grass pieces is the ratio of the mass of grass pieces with a length not exceeding 40mm to the mass of the sampled grass pieces. 4.3 Processing requirements for main parts
4.3.1 Cutter roller
a) The material shall not be lower than ZG270-500 in GB/T11352 and shall be annealed; ZCQ4
$650690
b) The straightness tolerance of the three bearing surfaces over the entire length shall be 0.20mm in the length direction and 0.06mm in the width direction; c) The hole size tolerance matching the cutter roller shaft shall be H8 in GB/T1801, and the surface roughness R. value shall not be greater than 3.2μm. 4.3.2 Knife roller shaft
a) The material shall not be lower than 45 steel in GB/T699 and shall be quenched and tempered; b) The radial runout tolerance of the two supporting journal surfaces to the common axis of the center holes at both ends shall comply with the provisions of Table 2: Table 2
Radial runout tolerance.mm
QB/T 2419—1998
c) The radial runout tolerance of the two cone surfaces to the common axis at both ends shall comply with the provisions of Table 3 Table 3
Radial runout tolerance, mm
d) The size tolerance of the journal of the knife roller is t8 in GB/T1801, and the surface roughness R value shall not exceed 1.6μm. 4.3.3 The bottom knife seat
a) The material shall not be lower than ZG270-500 in GB/T11352; b) The straightness tolerance of the knife surface over the entire length is 0.20mm in the length direction and 0.08mm in the width direction. 4.4 Assembly quality
4.4.1 All parts must be inspected and qualified. Standard parts and purchased parts must have quality certificates and can be assembled only after passing the inspection. 4.4.2 The assembly shall comply with the provisions of QB/T1588.3. 4.4.3 After the knife roller and the knife roller shaft are assembled, they are statically balanced. The residual unbalance is shown in Table 4. Table 4
Residual unbalance, kg·cm
4.4.4 After the large V-belt pulley, flywheel, knife roller and knife roller shaft assembly are assembled, they are statically balanced. The residual unbalance is shown in Table 5. Table 5
Residual unbalance, kgcm
4.4.5 The connection between the feeding and conveying parts and the cutting parts shall be firm, and the feeding parts shall move flexibly and lightly on the track. 4.5 Appearance quality
4.5.1 The appearance shall not have defects such as protrusions, depressions, roughness and other damages other than those specified in the drawings. 4.5.2 The edges of exposed parts and exposed joint surfaces shall be neat and without obvious misalignment. 4.5.3 The non-machined surfaces shall be painted, and the quality of the paint shall comply with the provisions of QB/T1588.4. 4.6 Running performance
4.6.1 The rotation of the knife roller, feeding roller and various running parts shall be flexible, stable and free of obstruction. 4.6.2 The noise (sound pressure level) of idling operation shall not exceed 85dB(A). 4.6.3 When idling for 1h at the specified speed, the temperature of the main bearing shall not be higher than 80℃ and the temperature rise shall not be greater than 40℃. 4.7 Electrical system requirements
4.7.1 The metal casing of the electrical device and the main engine should have a grounding device. The grounding terminal should be located at the wiring position and marked with a protective grounding symbol. 4.7.2 The metal casing of the electrical device or the metal parts that may be energized must have a reliable electrical connection with the grounding screw. The measured value of the connection resistance between it and the grounding screw shall not exceed 0.12. 4.7.3 The insulation resistance measured when 500Vd.c is applied between the power circuit conductor and the protective grounding circuit should be not less than 1MQ. 4.7.4 The electrical insulation should be able to withstand 1000V, 50Hz AC sine wave for 1s without breakdown and flashover. 5 Test method
5.1 Determination of production capacity
During the measurement, the feeding should be uniform and the thickness should be reasonable. The fodder should be relatively neat. Weigh 1t~2t of fodder and calculate the production capacity according to formula (1). G
Where: Q-
Production capacity, t/h;
G——Forage weight, t;
T.-Actual cutting time, min.
5.2 Determination of grass piece qualified rate
QB/T 2419—1998
5.2.1 The determination of grass piece qualified rate is carried out in the same way as the determination of production capacity. The manual sorting method is adopted. 5.2.2 Samples are taken twice within 5min to 10min after the actual cutting begins. The mass of each sample is about 2kg. The samples are measured with a scale with a resolution of no more than 5g. The grass piece qualified rate is calculated according to formula (2). Where: h—grass piece qualified rate, %;
G,——qualified grass piece mass, kg;
G--sampled grass piece mass, kg.
G×100
5.3 Circular runout and straightness are tested in accordance with the relevant provisions of GB/T1958. 5.4 Surface roughness is tested with a comparison sample. 5.5 The residual unbalance is measured at the maximum outer edge of the workpiece using a guide rail static balance frame. 5.6 Idle running test
5.6.1 The cutting part is idle for 1 hour. During the test, the feed conveyor and feeding part are not connected, and the discharge conveyor belt is not installed. 5.6.2 Noise is measured using a sound level meter with an accuracy of 1.0 in accordance with the provisions of GB/T16769. (2)
5.6.3 The bearing temperature and temperature rise are measured three times on the bearing surface using a surface thermometer with an allowable error of ±3°C. The maximum value measured is the bearing temperature, and the average value of the three measured temperatures minus the room temperature is the bearing temperature rise. 5.7 The length of the grass blade is measured with a ruler.
5.8 The speed is measured using a tachometer with a resolution of 1r/min. 5.9 Visual inspection is used for appearance quality.
5.10 Inspection of electrical system
Self-test and electrical measuring instruments and meters (such as microresistance tester, 500V megohmmeter, withstand voltage tester with power of 500VA or above, etc., the accuracy of which should not be less than 0.5 level) are used for inspection. 6 Inspection rules
6.1 Factory inspection
6.1.1 Each lawn mower shall be inspected and qualified by the quality inspection department of the manufacturer in accordance with this standard and shall be accompanied by quality certification documents before it can be shipped out of the factory. 6.1.2 The factory inspection items are 4.3 to 4.7. 6.2 Type inspection
6.2.1 In any of the following situations, the lawn mower shall be subject to type inspection. a) New product trial production and identification;
b) After formal production, if there are major changes in structure, materials, and processes that may affect the performance of the lawn mower; c) During normal production, a type inspection shall be carried out every two years; d) When the national quality supervision agency proposes a type inspection requirement. 6.2.2 The type inspection items are all technical requirements of this standard. 6.3 Sampling
6.3.1 Factory inspection shall be carried out item by item. 6.3.2 One unit shall be sampled for type inspection each time, and the production capacity and grass piece qualification rate shall be tested at the user's factory. 6.4 Judgment rules
6.4.1 The factory inspection items adopt the full index achievement method. 6.4.2 Among the type inspection items, if the production capacity and grass piece qualification rate do not meet the specified indicators, it is allowed to make appropriate adjustments and then conduct tests until they are qualified, otherwise the type inspection is judged to be unqualified. QB/T2419-
—1998
6.5 When the manufacturer holds a user use report that meets the requirements, it can replace the type inspection. 7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 Each lawn mower should be fixed with a product label, and the form and size of the label should comply with the relevant provisions of GB/T13306. 7.1.2 The content of the label includes:
a) model, name, product standard number, trademark; b) main technical parameters;
c) factory number and manufacturing date;
d) manufacturer name and detailed address.
7.2 Packaging and transportation
7.2.1 The packaging of the lawn mower should comply with the provisions of QB/T1588.5. 7.2.2 The packaging storage and transportation graphic label should comply with the provisions of GB191. 7.2.31
The lawn mower is packed in a frame wooden box, and can also be shipped naked according to user requirements. 7.2.4 The accompanying documents (instruction manual, packing list, certificate of conformity) should be complete. 7.2.5 The lawn mower should comply with the relevant regulations of the railway, land, water and other transportation departments during transportation. 7.3 Storage
The lawn mower should be stored in a dry, ventilated and rainproof place. 3162 Among the type inspection items, if the production capacity and grass piece qualification rate do not meet the specified indicators, it is allowed to make appropriate adjustments and then conduct tests until they are qualified, otherwise the type inspection is judged to be unqualified. QB/T2419-
—1998
6.5 When the manufacturer holds a user use report that meets the requirements, it can replace the type inspection. 7 Marking, packaging, transportation, storagebzxz.net
7.1 Marking
7.1.1 Each lawn mower should be fixed with a product label, and the form and size of the label should comply with the relevant provisions of GB/T13306. 7.1.2 The content of the label includes:
a) Model, name, product standard number, trademark; b) Main technical parameters;
c) Factory number and manufacturing date;
d) Name and detailed address of the manufacturer.
7.2 Packaging and transportation
7.2.1 The packaging of the lawn mower shall comply with the provisions of QB/T1588.5. 7.2.2 The packaging storage and transportation icons shall comply with the provisions of GB191. 7.2.31
The lawn mower shall be packed in frame wooden boxes, and can also be shipped naked according to user requirements. 7.2.4 The accompanying documents (instruction manual, packing list, certificate of conformity) shall be complete. 7.2.5 The lawn mower shall comply with the relevant regulations of the railway, land, water and other transportation departments during transportation. 7.3 Storage
The lawn mower shall be stored in a dry, ventilated and rainproof place. 3162 Among the type inspection items, if the production capacity and grass piece qualification rate do not meet the specified indicators, it is allowed to make appropriate adjustments and then conduct tests until they are qualified, otherwise the type inspection is judged to be unqualified. QB/T2419-
—1998
6.5 When the manufacturer holds a user use report that meets the requirements, it can replace the type inspection. 7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 Each lawn mower should be fixed with a product label, and the form and size of the label should comply with the relevant provisions of GB/T13306. 7.1.2 The content of the label includes:
a) Model, name, product standard number, trademark; b) Main technical parameters;
c) Factory number and manufacturing date;
d) Name and detailed address of the manufacturer.
7.2 Packaging and transportation
7.2.1 The packaging of the lawn mower shall comply with the provisions of QB/T1588.5. 7.2.2 The packaging storage and transportation icons shall comply with the provisions of GB191. 7.2.31
The lawn mower shall be packed in frame wooden boxes, and can also be shipped naked according to user requirements. 7.2.4 The accompanying documents (instruction manual, packing list, certificate of conformity) shall be complete. 7.2.5 The lawn mower shall comply with the relevant regulations of the railway, land, water and other transportation departments during transportation. 7.3 Storage
The lawn mower shall be stored in a dry, ventilated and rainproof place. 316
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