This standard specifies the technical requirements, test methods and inspection rules, marking, packaging, transportation and storage that cast iron drying cylinders for papermaking machinery must have as pressure vessels. This standard applies to drying cylinders and blanket drying cylinders (hereinafter collectively referred to as "drying cylinders") with an outer diameter of no more than 3800mm and a working pressure of no more than 0.8MPa for papermaking machines, board machines and pulp machines. QB 2551-2002 Technical conditions for cast iron drying cylinders for papermaking machinery QB2551-2002 Standard download decompression password: www.bzxz.net

ICS 85. 100
Classification number Y91
Registration number: 10825-2002
Light Industry Standard of the People's Republic of China
QB 2551—2002
Replaces QB3662—1999
Technological condition of cast iron dryers used in paper machineryPublished on 2002-09-21
Implementation by State Economic and Trade Commission of the People's Republic of China on 2002-12-01
All technical contents of this standard are mandatory. Preface
QB 2551 - 2002
This standard is a revision of the professional standard ZBY91003-1988 "Technical Conditions for Cast Iron Drying Cylinders for Papermaking Machinery" issued by the former Ministry of Light Industry (this standard was issued by the State Light Industry Department [1999] No. 112 and converted to standard number QB3662-1999, and the content remains unchanged). The revised contents are as follows:
The outer diameter of the cast iron drying cylinder is expanded from 3000mm to 3800mm, and the operating pressure is increased from 0.5MPa to 0.8MPa; the material of the high-pressure cast iron drying cylinder is HT300, and the cylinder surface hardness is divided into two grades according to the outer diameter of the cylinder: because the outer diameter of the drying cylinder is expanded to 3800mm, the balance of the drying performance is related to the speed and rotation speed, and it is also divided into two grades according to the outer diameter of the cylinder. The surface roughness of the cylinder body is also adjusted. Appendix A of this standard is a normative appendix. This standard is proposed by the China Light Industry Federation. The China Light Industry Machinery Standard Promotion Technical Committee: This standard is drafted by the Light Industry Hangzhou Machinery Design Institute. The participating drafting units of this standard: Shanghai Paper Machinery Group Co., Ltd., Qinyang No. 1 Paper Machinery Factory, Qinyang Machinery Factory, Dajin Paper Machinery Factory, Yibin Paper Machinery Factory, Qinyang Light Machinery Factory, Shandong Lvhua Paper Machinery Co., Ltd. The drafters of this standard: Hui Zhongwen, Fang Ying, Zhu Huacun, Huang Xiaoquan, Ye Youcao, Liu Fengming, Huang Nanfang, Han Li, Yu Bing. This standard was first issued in 1988 and revised for the first time in December 2002. From the date of implementation of this standard, the former national light machinery industry association shall be responsible for the implementation of this standard. The light industry standard QB3662-1999 Technical Specifications for Cast Iron Drying Cylinders for Papermaking Machinery issued by the Bureau of Light Industry is abolished.
1 Scope
Technical Specifications for Cast Iron Drying Cylinders for Papermaking Machinery
QB2551-2002
This standard specifies the technical requirements, test methods and inspection rules, marking, packaging, transportation and storage that cast iron drying cylinders for papermaking machinery must have as pressure vessels.
This standard is applicable to the drying parts and blanket drying cylinders (hereinafter collectively referred to as "drying cylinders") of papermaking machines and paperboard machines with an outer diameter of less than 3800 mm and a working pressure of no more than 0.8 MPa. 2 Normative references
The following documents and clauses become clauses of this standard through reference in this standard: For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used: For any undated referenced document, the latest version applies to this standard. GB191-2000 Pictorial marking for packaging, storage and transportation
GB/T 1184 - 1996
Tolerances of shape and position without specification
GB/T 782--2000
Bolts with solid bobbin head
GB/T 9439—1988
GB/T 13306-1991
JR/T 7945--1999
QB/T 1339—1991
QB/T3917—1999
3 Requirements
3.1 Basic requirements
Gray iron parts
Gray iron mechanical properties test method
Paper machine roller and drying series
Dynamic balance of drying cylinder on paper machine roller
3.1.1 The design and manufacture of drying cylinders shall comply with the provisions of relevant standards. The design unit shall hold the pressure vessel design unit approval letter, and the manufacturing unit shall hold the pressure vessel manufacturing license. 3.1.2 Drying cylinders are Class 1 pressure vessels and should be manufactured according to the drawings and technical documents approved in the prescribed procedures. 3.1.3 Cast iron drying cylinder manufacturers with an outer diameter of not less than 2000mm and a design pressure of 0.5MPa should provide the quality and technical supervision agency with a finite element analysis design strength calculation report. 3.2 Materials of drying cylinders
3.2.1 The materials of the cylinder body and cylinder cover should comply with the provisions of GB/T 9439-1988. a) When the design pressure is 0.3MPa, it should not be less than HT200; b) When the design pressure is 0.5MPa, it should not be less than IIT250; c) When the design pressure is 0.8MPa, it should not be less than HT300. 3.2.2 The material of the manhole cover should not be less than HT200. 3.2. 3.2.4 When there are special requirements for the material of the bolts, it can be determined by negotiation between the supply and demand parties, and must meet the grade and corresponding mechanical performance indicators specified in this standard.
3.2.5 The performance level of the bolts used to connect the tension tube body and the two ends is not lower than 8.8: 1
QB2551—2002| |tt||3.3 The cylinder head of the drying cylinder should be aged after casting. Measures should be taken in the casting process of the cylinder body to eliminate the residual stress of casting. 3.4 When the cylinder surface is initially ground and found to have defects larger than 0.5mm, repair is allowed. Welding is not allowed during repair. Only rivet repair with the same material is allowed, and the following regulations should be met:
The diameter of the rivet should not be greater than its length, and should not exceed 8mm: a
The center distance between two adjacent repair holes should not be less than the sum of the diameters of the two repair holes; the depth of the repair should not exceed 40% of the total thickness; the number of repair holes on the cylinder surface should be per square meter. 3.5 Cylinder body processing, when the outer diameter is less than 2000mm, the surface hardness shall not be less than HB170, when the outer diameter is greater than 2000mm, the cylinder surface hardness shall be greater than HB190. The hardness difference between the two ends of the surface shall not be less than HB18~243.6 Balance of drying cylinder
3.6.1 For drying cylinders with an outer diameter less than 2000mm, when the speed is less than 300m/min, For drying cylinders with an outer diameter of less than 2000mm, when the speed is greater than 1001/min, static balance check shall be carried out: the residual unbalance shall not exceed 0.0005 of the weight of the drying cylinder. 3.6.2 For drying cylinders with an outer diameter of less than 2000mm, when the speed is greater than 300m/min, and for drying cylinders with an outer diameter of more than 2000mm, when the speed is greater than 100r/min, dynamic balance check shall be carried out, and the balance quality shall not be lower than G4 level specified in QB/T3917:1999. 3.6.3 The required amount of each balance block shall not exceed 25kg. 3.7 Drying cylinder processing quality requirements
3.7.1 The quality of the drying cylinder shall comply with the provisions of Table 1. Table 1 Drying cylinder processing quality
Cylinder surface roughness Ra
Cylinder outer diameter tolerance
Cylinder thickness tolerancebzxz.net
Surface cylindricality tolerance
(See Appendix A)
Surface width 3m
Surface width 3m
Cylinder. Surface. Common rail line of rail bearings at both ends. Unit of radial circular runout
Optical cylinder
0.2 (electroplated)
Multi-function paper machine drying cylinder
3.7.2 When the drying cylinder of a multi-function paper machine is supplied with the paper machine as a set, it should be numbered according to the actual outer diameter of the drying cylinder. The difference between the maximum and minimum outer diameters of the same drying cylinder should not exceed 0.5mm. 3.8 All fasteners should be subjected to oxidation treatment. 3.9 The drying cylinder must be equipped with a vent hole and a drain hole for water pressure test, and the two holes are 180° apart. 3.10 After the drying cylinder is assembled, a water pressure test must be carried out, and the test pressure should be 2 times the design pressure. 3.11 The surface of the drying cylinder should have a uniform gloss after fine grinding, without obvious wear marks and patching marks. 4 Test methods and inspection rules
4.1 Mechanical properties test
4.1.1 When casting the cylinder elbow, at least one single cast test bar should be cast. When casting the cover, at least three single cast test bars should be cast for each bag of molten iron. The preparation of single cast test bars shall comply with the provisions of GL1/I9439-1988. The tensile test specimen shall adopt the B-type test specimen specified in JB/Jiang 7945-1999. 4.1.2 Each cylinder body shall be subjected to at least one tensile test of one specimen, and the inspection rules shall be implemented in accordance with the provisions of GB/T9439~1988. If the tensile test specimens of both cylinder bodies are invalid due to casting defects, three tensile test specimens shall be taken from the old cylinder body for retesting. 4.2 Hardness test
QB2551-2002
4.2.1 After each cylinder body is dried and heated, a hardness test shall be carried out in accordance with the provisions of GB/T9439-1988. The test points shall be measured at each end within the range of 80mm~100mm from both ends of the body. The arithmetic mean of the hardness of the two points measured is the cylinder surface hardness value. 4.2.2 The hardness values ​​of the two points measured shall meet the requirements of 3.5. If the test results do not meet the requirements, repeat the test according to GB/T9439-1988. 4.3 When calibrating the static balance, a guide rail balancing device shall be used. 4.4 The surface roughness comparison sample block shall be checked for contour. 4.5 The cylindricality of the cylinder surface can be measured at different sections: the diameter method (i.e. two-point method). a) When the cylinder surface hardness is less than 3m, measure at least 10000 points at equal distances; b) When the cylinder surface width is not less than 30000 points, measure at least 10000 points at equal distances. 4.6 The radial pressure test shall be detected by a meter on the machine tool. 4.7 The water temperature of the water pressure test shall not be lower than 5℃, and the holding time shall not be less than 15min. Then it shall be reduced to the design pressure and maintained for 30min. There shall be no pressure reduction or leakage during the test, and the accumulated water shall be removed after the test. 4.8 Each drying cylinder shall be inspected and qualified by the quality inspection department of the manufacturer in accordance with the requirements of this standard before it can be shipped to the factory. 5 Marking, packaging, transportation, storage
5.1 Each drying cylinder shall be stamped with the factory number on the shaft end on the operating side. For drying cylinders with rotation direction requirements, the rotation direction mark shall also be made on the insulation board or cylinder cover on the operating side.
5.2 When the drying chain is supplied as a set with multiple paper machines, the grouping mark shall be made on the operating side. 5.3 Each drying cylinder shall be nailed with a label. The label shall be nailed on a single insulation board or cover on the operating side. The upper edge of the label shall be 200mm from the surface. The label shall comply with the provisions of GB/T13306-1991, including the content. a) Name:
Outer diameter × width:
Lelirui instrument category:
Product standard number:
Design pressure:
Design temperature:
Working medium:
Net volume:
H! Number:
Manufacturing date:
Manufacturing license number:
Manufacturer name:
Inspection mark,
5.4 The lower surface must be clean and coated with rust-proof grease, and wrapped with moisture-proof paper. 5.5
The air holes of the shaft head must be tightly sealed with plate materials. The shaft head should be coated with anti-rust grease and wrapped with oil-proof paper and oil-applied paper. The drying cylinder should be firmly fixed on the chassis and suitable for water and land transportation and loading requirements 5.63
After the drying cylinder is packaged, it is not allowed to be stored in the open air for a long time, nor is it allowed to be placed on a damp or waterlogged ground. It should not be placed, hit or dropped.
5.8 Each drying cylinder packaging board should be marked, including a) name, specifications and factory code:
b) destination, receiving unit and address:
QB2551—2002
departure station, delivery unit;
required quantity:
operation mark.
5.9 The packaging, storage and transportation graphic signs should comply with the relevant provisions of GB191-2000, and the drying cylinder should be accompanied by the following documents.
a) Certificate of Qualification 1 5:
Instructions (only one copy for the whole paper machine)
Packing list:
Product safety and technical quality inspection and verification of the drying cylinder. From the date of delivery, the user should recheck the cylinder surface every 6 months of storage, apply oil for rust prevention if necessary, and rotate the cylinder 5.11
180
Main parameters
≥500~630
2630~-800
8-~-1000
1000~1250
>1250~-1600
>1600~-2000
2000-~2500
2500~3150
2-3 150-~3800
Appendix A
(Normative Appendix)
Dimension d500mm Cylindricity tolerance value
Public grade
Tolerance value un
Figure A.1 Main parameter legend
QB2551-2002
People's Republic of China
Light Industry Standard
Technical conditions for cast iron drying cylinder for papermaking machinery
QB255 1-2002
Published by China Light Industry Press
Editorial address: No. 12 Hualu Road, Chaoyang District, Beijing
(3rd floor, Building 1, China National Pulp and Paper Research Institute)Postal code: 100029
Telephone: (010) 65811585
Copyright: All rights reserved. Infringements must be investigated
Book number: 155019·2478
Print run: 1-200
Price: RMB 8.009 The packaging, storage and transportation diagrams and signs shall comply with the relevant provisions of GB191-2000, and the dryer shall be accompanied by the following documents.
a) Certificate of Conformity 15:
Instructions (only one copy for the whole paper machine)
Packing list:
Product safety, technical and quality inspection and verification of the dryer. From the date of delivery, the user should recheck the cylinder surface every 6 months, apply oil to prevent rust if necessary, and rotate the cylinder 5.11
180
Main parameters
≥500~630
2630~-800
8-~-1000
1000~1250
>1250~-1600
>1600~-2000
2000-~2500
2500~3150
2-3 150-~3800
Appendix A
(Normative Appendix)
Dimension d500mm Cylindricity tolerance value
Public grade
Tolerance value un
Figure A.1 Main parameter legend
QB2551-2002
People's Republic of China
Light Industry Standard
Technical conditions for cast iron drying cylinder for papermaking machinery
QB255 1-2002
Published by China Light Industry Press
Editorial address: No. 12 Hualu Road, Chaoyang District, Beijing
(3rd floor, Building 1, China National Pulp and Paper Research Institute)Postal code: 100029
Telephone: (010) 65811585
Copyright: All rights reserved. Infringements must be investigated
Book number: 155019·2478
Print run: 1-200
Price: RMB 8.009 The packaging, storage and transportation diagrams and signs shall comply with the relevant provisions of GB191-2000, and the dryer shall be accompanied by the following documents.
a) Certificate of Conformity 15:
Instructions (only one copy for the whole paper machine)
Packing list:
Product safety, technical and quality inspection and verification of the dryer. From the date of delivery, the user should recheck the cylinder surface every 6 months, apply oil to prevent rust if necessary, and rotate the cylinder 5.11
180
Main parameters
≥500~630
2630~-800
8-~-1000
1000~1250
>1250~-1600
>1600~-2000
2000-~2500
2500~3150
2-3 150-~3800
Appendix A
(Normative Appendix)
Dimension d500mm Cylindricity tolerance value
Public grade
Tolerance value un
Figure A.1 Main parameter legend
QB2551-2002
People's Republic of China
Light Industry Standard
Technical conditions for cast iron drying cylinder for papermaking machinery
QB255 1-2002
Published by China Light Industry Press
Editorial address: No. 12 Hualu Road, Chaoyang District, Beijing
(3rd floor, Building 1, China National Pulp and Paper Research Institute)Postal code: 100029
Telephone: (010) 65811585
Copyright reserved. Infringements must be investigated
Book number: 155019·2478
Print run: 1-200
Price: RMB 8.00
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