This standard specifies the types and basic parameters, technical requirements, test methods, inspection rules, and marking, packaging, transportation, storage requirements of bridge-type screw unloaders. JB/T 7338-1994 Bridge-type screw unloader JB/T7338-1994 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T7338-94
Bridge Type Screw Unloader
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1995
Subject Content and Scope of Application
Cited Standards
Type, Basic Parameters and Dimensions
Technical Requirements
Test Methods
Inspection Rules
Marking, Packaging, Transportation, Storage
Warranty Period·
Appendix A
Appendix B| |tt||Test conditions for the span of bridge and unloader (supplement)Test method for the eccentricity of the center of gravity of screw (reference)
Machinery Industry Standard of the People's Republic of China
Bridge type screw unloader
1 Subject content and scope of application
JB/T7338-94
This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, and marking, packaging, transportation, storage requirements of bridge type screw unloader (hereinafter referred to as unloader). This standard is applicable to unloaders for unloading bulk materials such as coal, sand, limestone, etc. 2 Reference standards
GB 699 | | tt | GB10095
GB11352
GB/T 13306
Standard gauge railway construction limits
Pictorial markings for packaging, storage and transportation
High quality carbon structural steel
Technical conditions
Carbon structural steel
Form and position tolerances Provisions for tolerances not specified Short pitch precision roller chains for transmission
Short pitch precision roller chains for transmission Accessories for conveying Short pitch precision roller chains and sleeve chains for transmission Tooth forms and tolerances of sprockets Low alloy structural steel
Radiography and quality classification of steel fusion welded butt joints Crane design specification
Operating parts for controlling electrical equipmentStandard direction of movementProtection level of low-voltage electrical enclosures
Crane buffer
Metal melting coalWeld defect classification and descriptionRust level and rust removal level of steel surface before assemblyScratching test of paint and varnish film
Precision of involute cylindrical gears
Casting carbon steel parts for general engineering
GB/T13384
General technical conditions for packaging of electromechanical products
GB/T 14407
GBJ232
JB1152
JB2299
JB4315
Technical conditions for driver's cab of general bridge and gantry cranesConstruction and acceptance specifications for electrical installation engineeringUltrasonic testing of butt welds of boilers and pressure vesselsPaint colors and safety signs for mining and engineering lifting and transportation machinery productsElectronic control equipment for cranes
JB/T6392.1Type and size of crane wheels, matching of tread shape with railsJB/T6392.2Technical conditions for crane wheelsApproved by the Ministry of Machinery Industry on 1994-07-18
Implemented on 1995-07-01
JB/T 6406.1
JB/T6406.2
JT2006
ZBK22007
ZBK26007
ZBK26008
JB/T7338—94
Types, basic parameters and dimensions of electric filter block brakes Technical conditions for electric hydraulic block brakes
Indicators for control of coal dust concentration in reel loading and unloading operations Y series (IP44 ) Technical conditions for three-phase asynchronous motors Technical conditions for three-phase asynchronous motors for Y2 series hoisting and metallurgy Technical conditions for three-phase asynchronous motors for YZR series hoisting and metallurgy Types, basic parameters and dimensions
3.1 Types
Unloaders are divided into the following types according to the number of railway lines across which unloading operations are carried out: a. Single-line unloaders, product code XLQ, and their structural type is shown in Figure 1; b. Double-line unloaders, product code XLQE. Their structural type is shown in Figure 2. 3.2 Basic parameters and dimensions
The basic parameters and dimensions of unloaders are shown in Tables 1 and 2. Table 1
Unloading line
Adapt to GB146.2 railway construction limits
Unloading capacity t/h
Unloading granularity
Material density
Applicable vehicle
Maximum vehicle height
Screw speed
Trolley running speed
Trolley running speed
Drive and hoisting speed
Limit-1
Limit-2
≤200
Limit-1||tt| |12.5;13.5
Limestone
Flat-bottomed bulk car with inner width not less than 2750 and depth not more than 180055DO
Note: ①The unloading capacity of not less than 400t/h is determined under normal coal unloading conditions, 100Www.bzxZ.net
③The maximum particle size of Qing coal and half of the maximum particle size should not exceed 10%, that is, when the particle size exceeds the range in the table, the unloading capacity will be greatly affected,
③Double-track unloading machine, the locomotive passing limit should be met when the car gives way. 2
JB/T7338-94
JB/T7338-94
Unloading line
Adapt to railway construction limit
3.3 Unloading machine marking
3.3.1 Model representation method
3.3.2 Marking example
JB/T733894
Limit—1
Railway construction limit—1 or 2
Span S, m
Product code (see 3.1)
Span is 8m, adapt to railway construction limit—2 single Line unloading machine. Should be marked as: a.
Unloading machine XLQ8-2JB/T7338-94
Limit—2
Span is 13.5m, suitable for double-track unloading machine with railway construction limit of 1; should be marked as: b.
Unloading machine XLQE13.5-1JB/T7338--944 Technical requirements
4.1 Environmental conditions
Limit—1
12.5,13.5
4.1.1 The power supply of the unloading machine is three-phase AC, with a rated frequency of 50Hz and a voltage of 380V. The upper limit of the allowable voltage fluctuation of the motor and electrical is +10% of the rated voltage, and the lower limit (at peak current) is -15% of the rated voltage. The internal voltage loss of the unloading machine should meet the requirements of GB3811.
4.1.2 The altitude of the unloader installation site should not exceed 2000m (the motor capacity should be checked if it exceeds 1000m) 4.1.3 There should be no flammable or explosive gas in the working environment. 4.1.4 The maximum wind pressure of the outdoor unloader in non-working state is 800Pa (equivalent to level 11 wind) 5
4.1.5 The working wind pressure of the outdoor unloader should not exceed 150Pa (equivalent to level 6 wind) inland;
250Pa (equivalent to level 7 wind) along the coast.
JB/T 7338-94
4.1.6 The ambient temperature of the unloader in normal operation is: -25~+40℃, and the average temperature within 24h does not exceed +35C. 4.1.7 The relative humidity is allowed to be as high as 100% for a short time when the ambient temperature does not exceed +25℃. 4.2 Materials and heat treatment
4.2.1 The material of the metal structure of the unloader shall be in accordance with GB700 for carbon structural steel and GB1591 for low alloy structural steel. The grade selected shall generally not be lower than the requirements in Table 3.
Component type
Working environment overflow
Steel grade
Important components"
-20℃
Q235-B
<-20~-25
16Mn\or Q235-D
Note: 1) Important components refer to the main channel, end frame, trolley frame and the upper and lower true edge plates and webs of each beam. 2) The impact energy is required to be not less than 27] at -20℃. It shall be proposed or supplemented when ordering steel. Other components
≥-25℃
Q235-A·F
4.2.2 The material of the brake wheel shall not be lower than the 45 steel specified in GB699 or the ZG340-640 steel specified in GB11352. The heat treatment hardness of the brake wheel surface shall be 45~55HRC, and the hardness at a depth of 2mm shall not be lower than 40HRC. 4.2.3 The material of the upper and lower stop wheels shall not be lower than the 45 steel specified in GB699. 4.2.4 Blade material should not be lower than 16Mn steel in GB1591 4.3 Main parts
4.3.1 Unloaders should use parts with performance not lower than the following standards: cylindrical wheels
buffer
filter chain and sprocket
brake
JB/T6392.1 and JB/T6392.2
GB6164
GB1243.1~1243.2 and GB1244
JB/T6406.1 and JB/T6406.2
The precision of the gear pair of the reducer for unloaders should not be lower than the 8-8-7 level specified in GB10095. 4.3.2
The coaxiality of the spiral shaft axis at both ends of the spiral body should not be lower than the 9 level in GB1184. The screw body should be statically balanced and the balance quality level should be G250, that is, the maximum allowable eccentricity of its center of gravity is 25mm. Under normal coal unloading conditions, the life of the screw body should not be less than 375h. 4.3.5:
4.3.6 After the brake wheel is installed, its radial circular runout should not exceed level 9 in GB1184. 4.3.7 After the wheel is installed, the circular runout on the reference end face (a circular groove with a depth of about 1.5mm is machined on the outer surface after assembly as a mark) should not exceed level 9 in GB1184.
4.4 Welding
4.4.1 There should be no obvious defects visible to the naked eye at the weld. The classification and name of the defects shall be in accordance with the provisions of GB6417. 4.4.2 The butt welds of the flange plate and the web of the main beam should be subjected to non-destructive testing. The radiographic flaw detection should not be lower than level I specified in GB3323, and the ultrasonic flaw detection should not be lower than level 1 specified in JB1152. 4.5 Bridge
4.5.1 The main beam should have an upward camber, and its mid-span upward camber should be (0.4/1000~1/1000)S. The maximum upward camber should be controlled within the range of S/10 in the mid-span. The bridge frame inspection conditions are shown in Appendix A (Supplement): 4.5.2 The bending of the main beam in the horizontal direction should not be greater than S./2000 (S. is the measured length starting from the first large rib plate at both ends, measured at the large rib plate about 100mm away from the upper flange plate). It can only be convex to the side of the walkway. 4.5.3 The local flatness of the main beam shoe plate is tested in any direction and position with a 1m ruler. Its value is not greater than (,73<2 is the thickness of the rib plate, see Figure 3).
JB/T7338—94
4.5.4The horizontal deflection value of the flange plate on the main beam is 6≤B/200 (see Figure 4), and this value is measured at the rib plate. 4. 5. 5
The vertical deflection value of the web plate of the main beam is ≤H/200 (see Figure 5), and this value is measured at the long rib plate. Figure 3
4.5.6The trolley track is generally suitable for a whole track with the joints welded together, otherwise it must meet the following requirements: The height difference at the joint is d≤1mm (see Figure 7) a.
The head of the joint is e≤2mm (see Figure 7) The lateral misalignment at the joint is f≤1mm (see Figure 8). 4.5.7 The limit deviation of the trolley track gauge K (see Figure 6) is ±2 mm at the end of the span and ±2 mm in the middle of the span. Figure 5
4.5.8 The height difference between the two trolley tracks on the same section perpendicular to the trolley running direction (see Figure 9) A=5 mm. Figure 6
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