JB/T 5898-1991 Quenching crane

This standard specifies the types and basic parameters, technical requirements, test and inspection rules, etc. of quenching cranes. This standard is applicable to quenching cranes used in the heat treatment vertical well quenching process with a rated lifting capacity (code Gn) of 5~200/5t and a working level of A6. JB/T 5898-1991 Quenching Crane JB/T5898-1991 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Quenching Crane||tt| |Subject content and scope of applicationbZxz.net
JB 5898-91
This standard specifies the type and basic parameters, technical requirements, test and inspection rules, etc. of quenching cranes. This standard applies to quenching cranes (hereinafter referred to as cranes) for heat treatment vertical concurrent quenching processes with a rated lifting capacity (code G, hereinafter referred to as lifting capacity) of 5 to 200/50t and a working level of A6. 2
Quoted standards
GB700 carbon structural steel
GB1591 low alloy structural steel
GB/T14405 general bridge crane
JB/ZZ4 rigid body rotation Balance of parts
Note: All standards cited in GB/T11405 are quoted in this standard. They will not be repeated. 3 Types and basic parameters
3.1.1 The main structure of the crane is a double-girder bridge type, as shown in the figure below. 3.1.2 See Table 1 for the general control method of the crane’s rapid descent mechanism. Table 1
Rapid descent control mode
Thyristor closed-loop energy consumption braking type
Swing motor type
DC motor type
Lifting weight range||tt ||5~~200/50
5~50/10
5~200/50
Note: (1) The table refers to the commonly used lifting and lowering speeds of cranes, see Table 2 . Rapid descent speed 2k
② Under normal circumstances, it is advisable to use thyristor closed-loop energy consumption braking for rapid descent plan. The use of other control methods shall be determined through negotiation between the supply and demand parties. The Ministry of Mechanical and Electronics Industry of the People's Republic of China approved the No.
on 1991-10-19 and implemented on 1992-10-01| |tt||535
3.1.3 Model representation method
3.1.4 Marking example
JB 5898-—91
Quick descent mode code (see Table 1)
Span, (see Table 2)
Lifting weight, (see Table 2)| |tt||The pinyin prefixes for "governing" and "fire"
A bridge-type quenching crane with a lifting capacity of 20/5t, a span of 22.5m, and a rapid descent using thyristor closed-loop energy consumption braking should be marked as: a .
Crane YH20/5-22.5jJB5898—91b. The bridge type quenching crane with a lifting capacity of 40/10t, a span of 19.5m, and a swing motor type rapid descent should be marked: Crane YH40/10-19.5yJB5898— 913.2 Basic parameters
3.2.1 The basic parameters of the crane are as specified in Table 2. Table 2
Lifting weight Gn
32/5||tt| |40/10
100/20
Span S
16.5| |tt||19.5
19.5||tt ||22.5
Lifting height H
2224|| tt||2224
25～40
auxiliary hook
24~~26
commonly used Lifting speed
auxiliary hook
10~~12|| tt||12~20
Running speed
80-~110
50 --70
40~~45
r||tt| |T
Lifting capacity G,
125/32
160/32
200/50
4 Technical requirements| |tt||Span S
22.5|| tt||25.5
Lifting height H
Vice| |tt||JB5898—91
Continued Table 2
Common lifting speed u
30～45||tt| |Main
Except for the following supplementary requirements, the rest shall be implemented in accordance with the relevant contents of GB/T14405. 4.7 Environmental conditions
Running speed
When the DC motor rapid descent method is used, the voltage level of the DC current is determined by negotiation between the supply and demand parties. 4.2 Performance
Trolley
20~~30
4.2.1 The static rigidity of the crane is specified as: the load caused by the rated lifting capacity and the self-weight of the trolley system, at the mid-span of the main girder The resulting vertical static deflection shall not be greater than S/1000.
4.2.2 The braking distance of the rapid descent system should generally be controlled within the range of 300~~500mm. 4.2.3 The crane should be equipped with a downstroke limiter that is compatible with the rapidly descending hoisting mechanism. 4.2.4 When the swing motor is used for rapid descent, the swing motor system should be equipped with a one-way damper. 4.3 Materials of important components
4.3.1 Materials of important components of the crane metal structure (main beams, end beams, trolley frames), carbon steel shall not be lower than Q235-B specified in GB700 (but the plate thickness a> 20mm should be Q235-C). Low alloy structural steel shall not be less than 16Mn specified in GB1591. 4.3.2 When the swing motor is used for rapid descent, the brake wheel of the rapid descent system should be made of materials with good thermal fatigue. 4.4 Special parts
4.4.1 For the rapid descent system of the crane hoisting mechanism, if a cast brake wheel is used and there is an unprocessed surface, the brake wheel should be statically balanced according to the G16 level accuracy in JB/ZZ4 .
4.4.2 The brake of the rapid descent system of the hoisting mechanism should be equipped with an emergency opening device and can be controlled in the cab. 4.5 Driver's cab
The driver's cab of the crane should be of the thermal insulation type. 4.6 Electrical equipment
4.6.1 The hoisting mechanism of the crane should be equipped with overspeed protection. 4.6.2 If the user requires ground operation, a transfer switch can be set to meet the requirements of ground control. 4.6.3 When thyristor closed-loop energy consumption braking is used to control rapid descent: a tachometer generator
b. Anti-interference measures should be taken for the thyristor control device and the wires connecting the tachogenerator and the control panel; c.
When selecting resistor components, the heat capacity should meet the requirements of rapid decline. 4.7 Safety
JB 5898--91
4.7.1 A splash-proof cover should be installed on the hook pulley block, and a hook mouth locking device should be installed on the hook. 4.7.2 The steel wire rope of the lifting mechanism for quenching should be made of high temperature resistance. 4.7.3 The brake emergency opening mechanism is required to have reliable performance and sensitive action. 4.7.4. Fire-fighting preparations must be made before quenching. 5 Test
Except for the following supplementary requirements, the rest shall be carried out in accordance with the relevant contents of GB/T14405. 5.1 Rapid descent speed test
The rapid descent speed test of the crane can be carried out after the load test of the complete crane. Under 1.0G, under load condition, rapid descent 3 times with an interval of more than 10 minutes each time, and the average value is the rapid descent speed. For the swing motor solution, when there is a light load rapid descent test requirement, the light load rapid descent test load is (1/5~1/3)G. 5.2 Emergency opening test of the brake of Pinghuo hoisting mechanism. The emergency opening test can be carried out when the crane is no-load. Start the emergency opening mechanism, open its brake, and check the flexibility and reliability of the action.
6 Inspection Rules
6.1 Factory Inspection
6.1.1 Each crane should undergo factory inspection, and the inspection content includes all items except Chapter 5 of this standard. 6.1.2 The crane should be pre-assembled at the manufacturer, and the scope of pre-assembly should be as far as possible to the extent that each mechanism can be powered on for dry operation testing. 6.1.3 Only after passing the factory inspection can the inspection department of the manufacturer conduct acceptance and issue a product certificate of conformity to the user. 6.2 Type inspection
6.2.1 Cranes should generally undergo type inspection after installation at the user's site. The inspection is carried out jointly by the manufacturer and the user (or with the quality supervision department). The user will only accept the product after passing the inspection. 6.2.2 The main content of type inspection is to add the test content specified in Chapter 5 on the basis of factory inspection. Marking, packaging, transportation and storage
shall be carried out in accordance with GB/T14405.
8 Guarantee period
Manufacturing Guangying guarantees that the cranes supplied by the manufacturer will be used within 12 months from the date of use, but not longer than the It can work normally within 18 months from the date of shipment. Additional notes:
This standard is proposed and administered by the Beijing Hoisting and Transport Machinery Research Institute of the Ministry of Mechanical and Electronics Industry. This standard is drafted by Dalian Crane Machinery Co., Ltd. The main drafters of this standard are Wang Jun, Tang Yutao and Song Bingwen. 538
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