0.1 Principle
This standard gives the technical requirements of non-steel wire rope suspension means for lifts on the premise of at least achieving the same safety of steel wire rope suspension means for lifts.
0.2 Assumptions
0.2.1 In addition to the requirements of this standard, lifts using non-steel wire rope suspension devices shall meet the relevant requirements of GB 7588 or GB/T 21739.
0.2.2 The supplier and the purchaser have negotiated and reached an agreement on the following contents:
a) Intended use of lift;
b) Ambient conditions, such as temperature, humidity and exposure to sunlight, wind, snow or corrosive air;
c) Other matters related to the installation site.
Non-steel wire rope suspension means for lifts
1 Scope
This standard specifies the classification, technical requirements, inspection, test, inspection rules and acceptance concerning non-steel wire rope suspension means for lifts.
This standard is applicable to non-steel wire rope suspension means involved in traction drive lifts, with steel wire ropes or non-metal materials as load-bearing members. For non-steel wire rope suspension means of other new materials or structures, this standard may be used as a reference, and the inapplicable parts shall be determined by the supplier and the purchaser through negotiation.
2 Normative references
The following referenced documents are indispensable for the application 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 7588-2003 Safety rules for the construction and installation of electric lifts
GB/T 12805-2011 Laboratory glassware - Burettes
GB/T 14684-2011 Sand for construction
GB/T 20285-2006 Toxic classification of fire effluents hazard for materials
GB/T 31821-2015 Specification for discard of the main parts of lifts
JB/T 10696.10-2011 Test methods for determining mechanical, physical and chemical properties of electric cables and wires - Part 10: Rat gnawing test
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 7588 and the following apply.
3.1 non-steel wire rope suspension means
suspension means for lifts except the steel wire rope suspension means, comprised of coated ropes, coated belts and termination devices thereof
3.2 load-bearing member
components in a coated rope or belt that bear breaking force
3.3 coated rope
rope-shaped combined construction in which one or more layers of non-metal materials wrap a single load-bearing member
3.4 coated belt
banded combined construction in which one or more layers of non-metal materials wrap multiple load-bearing members
3.5 coating
non-metal material wrapping the load-bearing member
3.6 minimum breaking force
a specified value which the breaking force measured using the specified method shall not be below
Note: In kN.
3.7 measured breaking force
breaking force measured using the specified method
Note: In kN.
3.8 residual breaking force
breaking force measured using the specified method after use and wear
Note: In kN.
4 Classification
4.1 Coated rope
4.1.1 Type
A coated rope shall be rope-shaped construction, which is expressed by R. See Annex A for the specifications of coated ropes.
4.1.2 Construction
A coated rope shall be composed of load-bearing member and coating. See Figure 1 for the schematic diagram for the cross section of a common coated rope.
Keys:
D——the nominal diameter of coated rope, mm;
d——the nominal diameter of load-bearing member, mm;
1——the coating;
2——the load-bearing member.
Figure 1 Schematic diagram for the cross section of a common coated rope
4.1.3 Designation
The designation of coated rope consists of the following contents:
Example:
A coated rope with a nominal diameter of 6.5mm, containing coating made of TPU, load-bearing member with a nominal diameter of 5.0mm and made of M, and with a minimum breaking force of 28.0kN, is designated as:
Coated rope - GB/T 39172-R-6.5/5.0-TPU/M-28.0
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4.2 Coated belt
4.2.1 Types
A coated belt shall be a banded construction, which is expressed by B. Coated belt types are classified into flat type (BF) and tooth type (BT). See Annex A for the specifications of coated belts.
4.2.2 Construction
4.2.2.1 When the cross section of load-bearing member is circular, the coated belt shall be composed of load-bearing member and coating. See Figure 2 for the schematic diagram for the cross section of a common coated belt.
a) Flat type (BF)
b) Tooth type (BT) (I)
c) Tooth type (BT) (II)
Keys:
W——the nominal width of coated belt, mm;
T——the nominal thickness of coated belt, mm;
Tt1, Tt2——the distance from the center of load-bearing member to the contact surface between the coated belt and the traction sheave, or the distance from the center of load-bearing member to the tooth top of coated belt on the side in contact with the traction sheave, mm;
d——the nominal diameter of load-bearing member, mm;
t——the nominal thickness of load-bearing member, mm. For load-bearing member with a circular cross section, t=d;
1, 1a——the surface in contact with the traction sheave or the tooth top on the side in contact with the traction sheave;
2——the coating;
3——the load-bearing member.
Figure 2 Schematic diagram for the cross section of a coated belt with load-bearing member with a circular cross section
4.2.2.2 When the cross section of load-bearing member is noncircular, the coated belt shall be composed of load-bearing member and coating. See Figure 3 for the schematic diagram for the cross section of a common coated belt.
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Keys:
W——the nominal width of coated belt, mm;
T——the nominal thickness of coated belt, mm;
Tt1, Tt2——the distance from the center of load-bearing member to the contact surface between the coated belt and the traction sheave, mm;
w——the nominal width of load-bearing member, mm;
t——the nominal thickness of load-bearing member, mm;
1, 1a——the surface in contact with the traction sheave;
2——the coating;
3——the load-bearing member.
Figure 3 The schematic diagram for the cross section of a coated belt with load-bearing member with a noncircular cross section
4.2.3 Designation
The designation of coated belt consists of the following contents:
Example 1:
A coated rope with a nominal width of 30mm and a nominal thickness of 3.3mm, containing 10 load-bearing members with a nominal diameter of 2mm and made of M, and coating made of TPU, and with a minimum breaking force of 43kN, is designated as:
Coated belt - GB/T 39172-BF-30×3.3/10×2-TPU/M-43
Example 2:
A coated belt with a nominal width of 25mm and a nominal thickness of 4.5mm, containing 4 load-bearing members with a nominal width of 5mm and a nominal thickness of 2.5mm and made of N, coating made of TPU, and with a minimum breaking force of 110kN, is designated as:
Coated belt - GB/T 39172-BF-25×4.5/4×5×2.5-TPU/N-110
5 Technical requirements
5.1 Load-bearing member
5.1.1 Tensile strength
The nominal tensile strength shall be in the range of 1,570N/mm2 to 3,500N/mm2.
The nominal tensile strength shall be the lower limit of tensile strength of load-bearing member, and the deviation of tensile strength shall not exceed 390N/mm2.
Note: When the load-bearing member is made of metal material such as steel wire, the tensile strength refers to the tensile strength of the steel wire. When the load-bearing member is made of non-metal material, the tensile strength refers to the tensile strength of a single load-bearing member. For example, the nominal tensile strength of load-bearing member is 2,400N/mm2, while its upper limit of tensile strength is 2,790N/mm2.
5.1.2 Surface treatment
For metal load-bearing members, the metal wire shall be subjected to anti-corrosion treatment.
5.1.3 Joints
For metal load-bearing members, the metal wire shall have no joints.
Foreword I
Introduction II
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Technical requirements
6 Inspection
7 Tests
8 Inspection rules
9 Acceptance
10 Marking and quality certificate
11 Selection, operation and maintenance information and technical conditions for scrapping and replacing coated ropes (belts)
12 Packaging, storage and transportation
Annex A (Informative) Specification of coated rope (belt)
Annex B (Normative) Technical conditions for scrapping and replacing coated ropes (belts)
Annex C (Normative) Determination of breaking force
Annex D (Normative) Determination of adhesive strength
Annex E (Informative) Bending fatigue test of coated rope (belt)
Annex F (Informative) Traction force and equivalent friction coefficient
Annex G (Informative) Marking and quality certificate
Annex H (Informative) Information required for the order
Annex I (Informative) Selection, operation and maintenance information
Annex J (Informative) Packaging and storage
Bibliography
