This standard specifies the technical requirements, test and inspection rules for material box cranes. This standard is mainly applicable to cranes that use material box hangers to hang, transport and dump material boxes for charging converters (hereinafter referred to as cranes). JB/T 7688.4-1995 Technical conditions for metallurgical cranes Material box cranes JB/T7688.4-1995 Standard download decompression password: www.bzxz.net

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Standard of the Machinery Industry of the People's Republic of China
Technical Conditions for Metallurgical Cranes
Box Cranes
Subject Content and Scope of ApplicationWww.bzxZ.net
This standard specifies the technical requirements, test and inspection rules for box cranes. JB/T 7688.4--95
This standard is mainly applicable to cranes (hereinafter referred to as cranes) that use box hangers to hang, transport and dump boxes for charging converters.
2 Reference Standards
GB/T14407 Cabs for General Bridge and Gantry Cranes JB/T7688.1 Technical Conditions for Metallurgical Cranes General Requirements 3 Technical Requirements
Except for the following requirements, other technical requirements shall comply with the relevant provisions of JB/T7688.1. 3.1 Environmental Conditions
The minimum working environment temperature of the crane is -10°C and the maximum is not more than 105°C. 3.2 Performance in use
3.2.1 The rated lifting capacity of the crane is the sum of the mass of the material box and the lifted objects. 3.2.2 Two sets of lifting mechanisms, one of which can be used to dump the material box. 3.3 Main components
The sling adopts plate hooks and should meet the following requirements: 3.3.1
The material of the hook piece should not be lower than Q235-C steel, or 16Mn steel; the rolling direction of the hook piece material should be consistent with the length direction of the hook; if it is a multi-piece hook, the hook pieces should be in close contact after stacking (the gap should not be greater than 0.8m), and each piece should not be loose after tightening; the hook mouth should be equipped with an anti-wear protection saddle, and the maximum allowable value of its surface roughness Ra is 25μm. 3.3.2 A closed driver's cab should be used, and it should comply with the relevant provisions of GB/T14407. 3.4 Assembly
The installation deviation of the sheet hook shall comply with the following provisions: The limit deviation of hook distance L is shown in Table 1:
Hook distance L
Limit deviation
>3～4
The working surface of the hook mouth shall be kept horizontal, and the height difference of each set of working surfaces after installation shall not be greater than L/400. b.
3.5 Safety and sanitation
When one set of lifting mechanism is dumping or lifting the material box, the other set of lifting mechanism shall stop moving. Approved by the Ministry of Machinery Industry of the People's Republic of China on June 16, 1995 566
Implemented on July 1, 1996
4 Tests
JB/T 7688.4—95
4.1 Visual inspection of cranes According to Article 4.1 of JB/T7688.1 4.2 Qualification test
During the test, the load should be gradually loaded to the rated lifting weight, and the action test and test in all directions should be carried out under the standard voltage and rated speed of the motor. In addition to verifying the contents specified in Article 4.2 of JB/T7688.1, the dumping and lifting of the material box should also be verified, and its action should be flexible and reliable. 4.3 Carrying capacity test
4.3.1 Static load test
According to Article 4.3.1 of JB/T7688.1.
4.3.2 Dynamic load test
During the dynamic load test of the crane, the load should be added to the material box. Other requirements shall be in accordance with the relevant provisions of Article 4.3.2 of JB/T7688.1. Inspection rules
According to Chapter 5 of JB/T7688.1.
6 Marking, packaging, transportation and storage
According to Chapter 6 of JB/T7688.1.
7 Warranty period
According to Chapter 7 of JB/T7688.1.
Additional instructions:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Taiyuan Heavy Machinery Plant, and the Beijing Hoisting and Conveying Machinery Research Institute participated in the drafting. The main drafter of this standard is Zhao Yonghua.
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