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Machinery Industry Standard of the People's Republic of China
Material rake crane
Subject content and scope of application
JB 5899—91
This standard specifies metallurgy The types and basic parameters, technical requirements, testing and inspection rules of enterprise material rake cranes, etc. This standard is suitable for transporting, stacking and loading and unloading rolled or continuously cast bar-shaped bad materials. It has several material baskets (or additional hooks, electromagnetic chucks) beams, a slewing mechanism, and a tilting mechanism. The unloading rake crane (hereinafter referred to as the crane). 2
Quoted standards
GB700 carbon structural steel
GB1591 low alloy structural steel
GB1243.1 short pitch precision roller chain for transmission G31829 short ring for lifting General Principles for Chain Acceptance
Gl10089 Cylindrical Worm, Worm Gear, Accuracy
GB/T14405 General Overhead Crane
Note: All the standards that have been quoted in GB/T14405 are quoted in this standard and are not Repeat again. 3 Types and basic parameters
3.1 Type
3.1.1 The type of the crane is a bridge-type double-girder structure. According to the lifting system of the trolley, it is divided into two types: rigid material target crane and flexible material target crane. . The lifting system can be equipped with or without a slewing mechanism, see Figure 1. 5
Figure 1
Approved by the Ministry of Mechanical and Electronic Industry of the People's Republic of China on 1991-10-19 and implemented on 1992-10-01||tt ||539
3.1.2 Model representation method
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3.1.3 Marking example
JB5899-91
Those with a slewing mechanism are represented by "H" (those without are not represented) working level
-span, m
rated lifting capacity, t
model difference, rigid material pans are represented by " P", flexible materials use \N" code, the pinyin prefix of "zhi" is
Rated lifting capacity is 16t, span 22m, working level A8, rigid material rake crane equipped with slewing mechanism, marked as : Crane YP16-22A8HJB5899--91
A flexible material rake crane with a rated lifting capacity of 8t, span 19m, working level A6, without a slewing mechanism, marked as: Crane YN8-19A6JB5899--91||tt| |3.2 Basic parameters
3.2.1 The main parameters of the crane are the rated lifting capacity (code G.) series: 58, 10, 12.5, 16, 20, 25t. 3.2.2 The span of the crane (code S, see Figure 1) series is: 16, 19, 22, 25, 2831, 34m. 3.2.3
3.2.4
3.2.5
The working levels of the crane are: A6, A7, A8. The maximum lifting height of the crane: 7m for rigid material target; 10m for flexible material target. The working speed parameters of each mechanism of the crane are shown in the table below. Mechanism
Unit
Speed
3.3 limit size
Lift
16~32
Car operation
m/ minwwW.bzxz.Net
40~63
Crane operation
100~125
Swing
I/min
Rigid rake||tt| |24
The maximum limit dimensions H and B of the crane (see Figure 1) are determined by negotiation between the supply and demand parties. 4 Technical requirements
Except for the following supplementary requirements, the rest shall be implemented in accordance with the relevant contents of GB/T14405. 4.7 Environmental conditions
The crane should work indoors, and the working environment temperature is 5 to 55C. 4.2 Performance
Flexible material cake
0. 8~~1. 6
Tipping
(·>s
6.3~10| |tt||4.2.1 The lifting capacity of the crane should reach the rated lifting capacity. The rated lifting capacity does not include the self-weight of the material target beam system, which is the weight of several material bags (or several hooks and electromagnetic chucks removed) below the beam. The weight of the lifted object; when using an electromagnetic chuck, it includes the self-weight of the electromagnetic chuck
4.2.2 The crane should be able to maintain the synchronization of the lifting and lowering of both sides of the material cake beam and the synchronization of the turning of several material cakes, and shall not cause deviation. Inclined. 4.2.3 The static rigidity of the crane is stipulated as follows: the vertical static deflection caused by the load caused by the rated lifting capacity and the self-weight of the trolley system is not greater than S/1000
4.3 Materials of important components|| tt||4.3.1 Materials of important components of the crane metal structure (main beams, end beams, trolley frames, cross beams, balance beams, rigid guides, guide rods, etc.) and panels (material targets, brake arms, etc.), Carbon steel is not lower than Q235-B specified in GB700 (but when the plate thickness is 8>20mm, it should be Q235-C). Low alloy structure 540
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. | | tt | Gray cast iron parts are used. 4.4 Special parts
4.4.1 If the rotary mechanism is driven by a worm or worm gear reducer, its accuracy shall not be lower than the grade 8 4.4.2 material specified in GB10089
4.4 .2.1 The surface of the target should be smooth and free of burrs, sharp corners, deformations, cracks (check with a 10~~20x magnifying glass), cuts and other defects. 4.4.2.2 The target can be cut from plates or forged in sections. Bevel butt welding at the bottom (see Figure 2) should ensure penetration, annealing after welding, and ultrasonic flaw detection, which must meet Grade 1 quality requirements. 4.4.2.3 Several materials working under the same beam must be adjacent. The height difference of the second working surface (b surface) should not be greater than 1mm. Figure 2 | Requirements of GB4829. 4.4.4 The crossbeam guide rod of the rigid rake crane should be annealed as a whole after welding. 4.4.5 The center lines of several keyways (or square sections) on the large shaft connecting several targets must be at On the same straight line, the tolerance shall not be greater than 0.5mm
4.5 Small frame and guide frame
4.5.1 For installation of the upper small frame (Figure 3) and guide frame (Figure 4). For the bolt holes, ensure that the center line of the guide frame is perpendicular to the bottom surface of the small frame (aa in Figure 3, with the plane of the bent plate where the three rotating wheels are installed as the reference point), and its verticality is not greater than 1/2000 +++|. |tt||Figure 3
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JB5899—91
Figure 4
If high-strength bolts are used to connect, there should be at least two holes on each side. of positioning bolts. 4.5.2 The center line of the slide inside the guide frame should be parallel to the center line of the guide frame, and its parallelism should not be greater than 3mm. 4:5.3 The circular track for rotation on the lower trolley frame should have a diameter tolerance of not less than level 12. The track support should Has enough stiffness. 4.5.4 On the lower trolley frame, the coaxiality of the upper and lower circular rails shall not be greater than 1mm. 4.6 Assembly
4.6.13 slewing wheel support points on the upper part: the relative height difference of the bottom surface of the trolley frame is not more than 2mm. 4.6. The relative difference between the supporting points of the 24 running trolley wheels on the lower part: the height of the circular track on the trolley frame is not greater than 2mm. 4.6.3 The center line of the rotating shaft of the flexible rake crane should be perpendicular to the frame platform of the rake tilting mechanism, and its verticality should not be greater than 0.25°. 4.6.4 For the reducer used in the slewing mechanism, measures must be taken to fix it with the foundation. It must not cause displacement during starting and braking, or transmit the impact force during starting and braking to the foundation through special connectors for absorption. 4.6.5 For cable drums and current collectors used in rotating mechanisms, the coaxiality of each slip ring after assembly shall not be greater than 1 mm. 4.6.6 All hinge points for rotation and rotation of the mechanism should be flexible to rotate. 4.7 Driver's Cab
4.7.1 The driver's cab of the crane should be of thermal insulation type. 4.7.2 An air cooler or air conditioner should be installed in the cab. 4.8 Electrical equipment
4.8.1 The selection, layout, and installation of electrical equipment should take into account the high temperature and frequent use of the metallurgical workshop, and require reliability, safety, and easy maintenance.
4.8.2 Most electrical equipment should be arranged in a closed special electrical room. Cooling devices should be installed indoors, but resistors are generally not installed indoors.
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JB 5899—91
4.8.3 Hoisting and metallurgical motors with insulation class H should be used (lower insulation class H motors must be used with reduced capacity). 4.8.4 Cables should be used for trolley power supply.
4.9 Lubrication
4.9.1 The main mechanism should adopt electric or manual centralized lubrication. Individual dispersed lubrication points (such as wheel lubrication on the lower trolley frame) are allowed to be filled with oil cups and oiled with oil guns.
4.9.2 The lubrication pipeline should be unobstructed and the lubrication should be reliable. 4.10 Safety
4.10.1 When the slewing mechanism does not use collectors for conduction but cables for conduction, the limiter should limit the number of rotations to protect the cables. 4.10.2 In order to prevent the slender parts being hoisted from colliding with the pillars of the factory building when they are slewing to the direction parallel to the main beam, interlocking limiters and safety rulers should be installed between the trolley running mechanism, the slewing mechanism and the bridge frame. The size of the limit should be determined in combination with the process requirements of the user department. 5 Tests
Except for the following supplementary requirements, the rest shall be carried out in accordance with the relevant contents of GB/T14405. 5.1 During the load lifting capacity test, the static load test shall be loaded at 1.4G, and the dynamic load test shall be loaded at 1.2G. 5.1.1 The load of various tests shall be the push load added to the material rake. Other picking devices (such as hooks, electromagnetic suckers) shall be tested individually, and their total lifting weight shall not exceed the rated value of the crane.
5.2 Mechanism test
The slewing mechanism and material target tipping mechanism unique to the crane shall be tested during the dynamic load test. The test shall be no less than 5 times. The mechanism is required to operate smoothly during the test and meet the functional requirements of each mechanism. When the slewing and lifting are linked, the guide rod is not allowed to be stuck. 6 Inspection rules
6.1 Factory inspection
6.1.1 Each crane shall be inspected at the factory, and the inspection content includes all items except Chapter 5 of this standard. 6.1.2 The crane should be pre-installed at the manufacturer, and the scope of pre-installation should be as far as possible to ensure that all mechanisms can be powered on for empty running tests. 6.1.3 After passing the factory inspection, the manufacturer's inspection department can conduct acceptance and issue a product certificate to the user. 6.2 Type inspection
6.2.1 The crane is generally subjected to type inspection after installation at the user's site, and the inspection is conducted jointly by the manufacturer and the user (or the quality supervision department). The user will accept it only after passing the inspection. 6.2.2 The main content of the type inspection is to add the test content specified in Chapter 5 to the factory inspection. 7 Marking, packaging, transportation, storage
Perform according to GB/T14405.
8 Warranty period
The manufacturer shall ensure that the supplied crane can work normally within 12 months from the date of use, but not more than 18 months from the date of delivery, under the conditions of proper storage, reasonable installation and correct use by the user. Additional Notes:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Dalian Hoisting Machinery Factory. The main drafters of this standard are Hu Yujun, Zhao Shouyong and Yu Qihua. 543
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