This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of high branch shears. This standard applies to high branch shears for trimming various branches and collecting tree species. QB/T 2289.3-1997 Gardening Tools High Branch Shears QB/T2289.3-1997 Standard download decompression password: www.bzxz.net

QB/T2289.3---1997
This standard is formulated on the basis of the former Ministry of Light Industry standards SG118-1978 "Rare Fruit Shears", SG119--1978 "Mulberry Branch Shears", SG120--1978 "Mulberry Leaf Shears" and SG121-1978 "High Branch Shears". This standard makes corresponding adjustments to the basic dimensions and technical requirements of the products, and unifies the inspection rules, packaging, marking, transportation and storage in accordance with the provisions of GB/T6867--1986 "Inspection Rules, Marking and Packaging of Gardening Tools". This standard will replace SG118-1978, SG119--1978, SG120-1978 and SG121-1978 from the date of implementation. This standard is proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Tool Hardware Standardization Center. The drafting units of this standard are: Shanghai Tool Industry Research Institute, Anhui Wuhu Garden Tool Factory, etc. The main drafters of this standard are: Lin Meide, Han Daiyao. 661
Light Industry Standard of the People's Republic of China
Gardening Tools
High Branch Shears
QB/T 2289. 3--1997
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of high branch shears. This standard is applicable to high branch shears for trimming various branches and collecting tree species. 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. GB/T230—1991Metal Rockwell hardness test methodGB/T1911—1991Copy paperwwW.bzxz.Net
GB5936—1986Test method for chemical protective layer of ferrous metals in light industrial productsDiffuse drop method
GB/T6867-1986Inspection rules, marking and packaging of gardening tools3Product classification
3.1Type
The type of high branch shears is shown in Figure 1.
3.2Basic size
The basic size of high branch shears is specified in Table 1.
Basic dimensions
Basic dimensions
Basic dimensions
Approved by China Light Industry Association on April 10, 1997
Basic dimensions
Basic dimensions deviation
Basic dimensions
Implemented on December 10, 1997
4 Technical requirements
4.1 Surface quality
QB/T2289.3--1997
Type of high branch shears
4.1.1 The surface of high branch shears should be smooth, without defects such as cracks, burrs, oxide scale, etc. 4.1.2 The surface of high branch shears should be polished, and other parts should be blackened. H
4.1.3 R of the surface roughness of the polished part. The value should not be greater than 12.5μm, and the R value of the surface roughness of other parts should not be greater than 25μm. 4.1.4 The surface of the blackened part should have a uniform black oxide layer, and there should be no bottom exposure. 4.2 Hardness
The hardness of the large shears of the high branch shears should not be less than 54HRC, and the hardness of the small shears should not be less than 50HRC. 4.3 Performance
4.3.1 The blade of the high branch shears should be sharp, the blade line should be neat, and there should be no chipping or curling. 4.3.2 The shear head of the high branch shears should be flexible to open and close, and the shear blade should not be over-edged after closing. 4.3.3 The shear spring of the high branch shears should be able to stretch to 120mm under the action of 150N. 5 Test method
5.1 Dimension inspection
The dimensions of the high branch shears are inspected using general measuring tools and special pallets. 5.2 Surface quality inspection
5.2.1 The surface quality of the high branch shears shall be inspected visually. 5.2.2 The surface roughness of the high branch shears shall be inspected by comparison with the surface roughness standard block. 5.2.3 The blackened part of the high branch shears shall be tested in accordance with the provisions of GB5936. 5.3 Hardness test
The hardness of the high branch shears shall be tested in the area shown in Figure 2 in accordance with the provisions of GB/T230. 663
5.4 Performance test
QB/T2289.31997
Figure 2 Hardness test area
5.4.1 The opening and closing flexibility of the shear head of the high branch shears shall be inspected by hand feel. 5.4.2 When the full cutting blade of the high branch shears is used to cut the C-level copy paper specified in GB/T 1911, the cut surface shall be smooth and neat, and there shall be no pulling or tearing.
5.4.3 Commercial branch shears should be able to smoothly cut live branches with a diameter of 10mm under a force of 100N. 5.4.4 The tensile test of shear springs using a special testing machine must comply with the provisions of 4.3.3. 6 Inspection rules
The inspection rules for products shall comply with the provisions of Chapter 1 of GB/T6867-1986. 7 Marking, packaging, transportation and storage
The marking, packaging, transportation and storage of products shall comply with the provisions of Chapter 2 of GB/T6867-1986. 664
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