GB/T 21307-2025 Roller gin English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 65.040.020
CCS B 93
National Standard of the People's Republic of China
GB/T 21307-2025
Replaces GB/T 21307-2007
Roller gin
Issue date: 2025⁃04⁃25 Implementation date: 2025⁃11⁃01
Issued by the State Administration for Market Regulation of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Product model
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, storage, and transportation
Annex A (Normative) Calculation of allowable unbalance for steady-state (rigid) rotors
Annex B (Normative) Determination of fuzz content rate on cottonseeds
Roller gin
1 Scope
This document specifies the technical requirements for the appearance quality, quality of key components and overall performance of leather-roller cotton gins, as well as provisions regarding inspection rules, marking, packaging, storage and transportation. It describes the corresponding sampling and test methods, and also provides the composition and classification of product models.
This document is applicable to the design, manufacture and quality inspection of leather-roller cotton gins.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 6103 Test method for cotton defects in raw cotton - Hand
GB/T 6388 Transport package shipping mark
GB/T 9239.1-2006 Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state - Part 1: Specification and verification of balance tolerances
GB 18399 Security requirement of cotton processing machinery
GB/T 19635-2024 Cotton - Sea island cotton
GB/T 32139-2015 Terms of cotton processing
3 Terms and definitions
The terms and definitions defined in GB/T 32139-2015 and the following ones are applicable to this document.
3.1
double knife
leather-roller cotton gin component that performs rotational motion, impacts seed cotton, and separates fibers from cottonseeds
3.2
moving knife
leather-roller cotton gin component that performs reciprocating motion, impacts seed cotton, and separates fibers from cottonseeds
3.3
fixed knife
leather-roller cotton gin component that is relatively fixed, exerts a blocking effect on seed cotton, and separates fibers from cottonseeds
3.4
covered roller
component with a wooden stick core whose outer layer is wrapped in strips of leather (of uniform thickness) arranged in a spiral pattern
[Source: GB/T 32139-2015,3.1.1.1]
3.5
percentage of tag on ginned cottonseeds
percentage of the weight of fuzz on a given weight of fuzzy cottonseed to the weight of the fuzzy cottonseed sample
[Source: GB/T 32139-2015,2.4.5]
3.6
percentage of cotton loss
percentage of seed cotton discharged from the impurity-rejecting screen within a certain period to the total amount of seed cotton processed
[Source: GB/T 32139-2015,3.1.4.4]
4 Product model
The composition of the product model is shown in Figure 1.
Figure 1: Diagram of Product Model Composition
Example:
MYPC-100B, where M represents a cotton processing machine, Y represents a gin machine, P represents a skin roll, C represents a punching knife type, 100 represents a skin roll working length of 1000 mm, and B represents a second improvement, which represents a punching knife type skin roll gin having a working length of 1000 mm after the second improvement.
5 Technical Requirements
5.1 Appearance
5.1.1 The outer surface of the product shall be smooth, flat, and aesthetically pleasing, with uniform and firmly applied paint, free from bubbles or missed spots.
5.1.2 Exposed machined surfaces of components shall undergo anti-corrosion treatment.
5.2 Major Components
5.2.1 The roller ginning machine primarily consists of four main components: cleaning cylinder, rotary knife, fixed knife, and roller. A simplified diagram of these components is shown in Figure 2.
5.2.2 The cleaning cylinder shall undergo dynamic balance testing, with allowable imbalance complying with Appendix A. The balance quality grade shall not be lower than G16 as specified in GB/T 9239.1-2006.
5.2.3 The radial runout of the roller shall not exceed 1.5 mm.
5.2.4 The rotary knife shall be smooth and free from burrs.
5.2.5 The radial runout of the rotary knife shall not exceed 0.3 mm.
5.2.6 The fixed knife shall be free from cracks or pits, smooth, burr-free, and have a straight cutting edge.
5.2.7 The fixed knife shall be free from cracks or pits, smooth, burr-free, and have a straight cutting edge.
5.3 Machine Performance
5.3.1 After assembly, the straightness of the cutting edge of the fixed knife shall not exceed 0.5 mm within a 500 mm range.
5.3.2 After assembly, the straightness of the cutting edge of the fixed knife shall not exceed 0.5 mm within a 500 mm range.
5.3.3 All moving parts shall operate smoothly without collisions, and fasteners shall remain secure without loosening.
5.3.4 During continuous operation for 30 minutes, the temperature rise at roller bearings and rotary knife bearings shall not exceed 20°C.
5.3.5 The no-load noise shall not exceed 85 dB(A).
GB/T 21307-2025 Roller gin English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 65.040.020
CCS B 93
National Standard of the People's Republic of China
GB/T 21307-2025
Replaces GB/T 21307-2007
Roller gin
Issue date: 2025⁃04⁃25 Implementation date: 2025⁃11⁃01
Issued by the State Administration for Market Regulation of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Product model
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, storage, and transportation
Annex A (Normative) Calculation of allowable unbalance for steady-state (rigid) rotors
Annex B (Normative) Determination of fuzz content rate on cottonseeds
Roller gin
1 Scope
This document specifies the technical requirements for the appearance quality, quality of key components and overall performance of leather-roller cotton gins, as well as provisions regarding inspection rules, marking, packaging, storage and transportation. It describes the corresponding sampling and test methods, and also provides the composition and classification of product models.
This document is applicable to the design, manufacture and quality inspection of leather-roller cotton gins.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 6103 Test method for cotton defects in raw cotton - Hand
GB/T 6388 Transport package shipping mark
GB/T 9239.1-2006 Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state - Part 1: Specification and verification of balance tolerances
GB 18399 Security requirement of cotton processing machinery
GB/T 19635-2024 Cotton - Sea island cotton
GB/T 32139-2015 Terms of cotton processing
3 Terms and definitions
The terms and definitions defined in GB/T 32139-2015 and the following ones are applicable to this document.
3.1
double knife
leather-roller cotton gin component that performs rotational motion, impacts seed cotton, and separates fibers from cottonseeds
3.2
moving knife
leather-roller cotton gin component that performs reciprocating motion, impacts seed cotton, and separates fibers from cottonseeds
3.3
fixed knife
leather-roller cotton gin component that is relatively fixed, exerts a blocking effect on seed cotton, and separates fibers from cottonseeds
3.4
covered roller
component with a wooden stick core whose outer layer is wrapped in strips of leather (of uniform thickness) arranged in a spiral pattern
[Source: GB/T 32139-2015,3.1.1.1]
3.5
percentage of tag on ginned cottonseeds
percentage of the weight of fuzz on a given weight of fuzzy cottonseed to the weight of the fuzzy cottonseed sample
[Source: GB/T 32139-2015,2.4.5]
3.6
percentage of cotton loss
percentage of seed cotton discharged from the impurity-rejecting screen within a certain period to the total amount of seed cotton processed
[Source: GB/T 32139-2015,3.1.4.4]
4 Product model
The composition of the product model is shown in Figure 1.
Figure 1: Diagram of Product Model Composition
Example:
MYPC-100B, where M represents a cotton processing machine, Y represents a gin machine, P represents a skin roll, C represents a punching knife type, 100 represents a skin roll working length of 1000 mm, and B represents a second improvement, which represents a punching knife type skin roll gin having a working length of 1000 mm after the second improvement.
5 Technical Requirements
5.1 Appearance
5.1.1 The outer surface of the product shall be smooth, flat, and aesthetically pleasing, with uniform and firmly applied paint, free from bubbles or missed spots.
5.1.2 Exposed machined surfaces of components shall undergo anti-corrosion treatment.
5.2 Major Components
5.2.1 The roller ginning machine primarily consists of four main components: cleaning cylinder, rotary knife, fixed knife, and roller. A simplified diagram of these components is shown in Figure 2.
5.2.2 The cleaning cylinder shall undergo dynamic balance testing, with allowable imbalance complying with Appendix A. The balance quality grade shall not be lower than G16 as specified in GB/T 9239.1-2006.
5.2.3 The radial runout of the roller shall not exceed 1.5 mm.
5.2.4 The rotary knife shall be smooth and free from burrs.
5.2.5 The radial runout of the rotary knife shall not exceed 0.3 mm.
5.2.6 The fixed knife shall be free from cracks or pits, smooth, burr-free, and have a straight cutting edge.
5.2.7 The fixed knife shall be free from cracks or pits, smooth, burr-free, and have a straight cutting edge.
5.3 Machine Performance
5.3.1 After assembly, the straightness of the cutting edge of the fixed knife shall not exceed 0.5 mm within a 500 mm range.
5.3.2 After assembly, the straightness of the cutting edge of the fixed knife shall not exceed 0.5 mm within a 500 mm range.
5.3.3 All moving parts shall operate smoothly without collisions, and fasteners shall remain secure without loosening.
5.3.4 During continuous operation for 30 minutes, the temperature rise at roller bearings and rotary knife bearings shall not exceed 20°C.
5.3.5 The no-load noise shall not exceed 85 dB(A).
