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GB 21500-2008: Trackless tyred mining truck for underground mines -- Safety requirements
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Trackless tyred mining truck for underground mines -- Safety requirements
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Basic data | Standard ID | GB 21500-2008 (GB21500-2008) | | Description (Translated English) | Trackless tyred mining truck for underground mines -- Safety requirements | | Sector / Industry | National Standard | | Classification of Chinese Standard | D93 | | Classification of International Standard | 73.100.40 | | Word Count Estimation | 15,124 | | Date of Issue | 2008-03-13 | | Date of Implementation | 2008-10-01 | | Quoted Standard | GB 12265.2; GB 12265.3; GB/T 13306; GB/T 14775; GB/T 14781; GB/T 15706.1-2007; GB/T 15706.2-2007; GB 16423; GB 16754; GB/T 16855.1; GB/T 17299; GB/T 17300; GB/T 17771; GB/T 17922; GB/T 18153; GB/T 19670; GB 20651.1-2006; JB/T 3583; JB/T 5052; JB/T 7692; JB/T 7693; JB/T 7694; JB/T 8548; JB/T 8816; JB/T 10135; JG/T 48; GB/T 1190; GB 1251.1; GB/T 2883; GB 2894; GB/T 2980; GB/T 3766; GB 4351.1; GB 4785; GB/T 5008.1; GB/T 5226.1-2002; GB/T 6072.1; GB/T 8196; GB/T 8420; GB/T 8593.1; GB/T 8593.2; GB/T 8595; GB 9656; GB 9969.1; GB 12265.1 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard specifies requirements for underground mine rail wheel transporting tub safety requirements. This standard is intended to be used from the physical properties and aspects of underground mine rail wheel transporting tub proposed restrictions. This standard specifies the safety requirements applicable to GB/T 15706. 1-2007 machines specified in 5. 3 during the life of the danger arising from the various stages. This standard applies to underground metal ore and non-metallic minerals, engineering, tunnel underground mine using diesel rail wheel transporting tub. | GB 21500-2008: Trackless tyred mining truck for underground mines -- Safety requirements---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Trackless tyred mining truck for underground mines.Safety requirements
ICS 73.100.40
D93
National Standards of People's Republic of China
Underground mine trolley wheel transporting tub
Safety requirements
Posted 2008-03-13
2008-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
All the technical contents of this standard is mandatory.
This standard relates to the underground mine safety trackless wheel transporting the tub.
This standard does not relate to the risks associated with GB/T 15706.1-2007 and GB/T 15706.2-2007 agreement.
The standard proposed by China Machinery Industry Federation.
This standard by the National Mining Machinery Standardization Technical Committee (SAC/TC88) centralized.
This standard is drafted by. Sinosteel Hengyang Heavy Machinery Co., Ltd.
Participated in the drafting of this standard. Luoyang Mining Machinery Engineering Design Institute.
The main drafters of this standard. high dream bear, Xiaoqi Lin, Gan Yulin, Zhao Yuan, Li Yang, now, Li Hang, creative approach.
This standard was first formulated.
Underground mine trolley wheel transporting tub
Safety requirements
1 Scope
This standard specifies the safety requirements for underground mining trackless wheel transporting the tub.
This standard is intended to be used from the physical properties and aspects of underground mining restrictions trackless wheel transporting tub raised.
Safety requirements specified in this standard applies to the GB/T 15706.1-2007 5.3 stipulated various stages of the life of the machine produced
Danger.
This standard applies to underground metal ore and non-metallic minerals, engineering, diesel underground mine tunnels used by trackless wheel transporting tub (hereinafter
Referred shipped tub).
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 1190 OTR tire technical requirements
GB 1251.1 workplace Auditory danger signal danger signal (GB 1251.1-1989, eqv ISO 7731. 1986)
GB/T 2883 construction machinery Wheel Size Series (GB/T 2883-2002, ISO 4250-3.1997, MOD)
GB 2894 Safety Signs (GB 2894-1996, neq ISO 3864. 1984)
GB/T 2980 OTR tire specifications, size, pressure and load capacity (GB/T 2980-2001, eqv ISO 4250-1.1996)
GB/T 3766 Hydraulic System General technical conditions (GB/T 3766-2001, eqv ISO 4413.1998)
GB 4351.1 Portable fire extinguishers - Part 1. Performance and structural requirements (GB 4351.1-2005, ISO 7165.1999,
NEQ)
GB 4785 Installation regulations for car and trailer exterior illumination and light signal devices (GB 4785-2007, ECER48.2001, NEQ)
GB/T 5008.1 lead-acid starter batteries technical conditions (GB/T 5008.1-2005, IEC 60095-1.2000, MOD)
GB 5226.1-2002 Safety of machinery electrical equipment Part 1 General technical conditions (IEC 60204-1.2000,
IDT)
Calibration GB/T 6072.1 reciprocating internal combustion engines - Performance - Part 1 Standard reference conditions of power, fuel and lubricating oil consumption
And test methods (GB/T 6072.1-2000, idt ISO 3046-1.1995)
GB/T 8196 mechanical safety devices fixed and movable guards General requirements for the design and manufacture
(GB/T 8196-2003, ISO 14120.2002, MOD)
GB/T 8420 moving machinery physical dimensions of operators and minimum operator space (GB/T 8420-2000,
eqv ISO 3411.1995)
GB/T 8593.1 moving machinery - Symbols for operator controls and other displays - Part 1. Common symbols (GB/T 8593.1-
1998, eqv ISO 6405-1.1991)
GB/T 8593.2 moving machinery - Symbols for operator controls and other displays - Part 2. Specific symbols for machines, equipment and accessories
No. (GB/T 8593.2-1998, eqv ISO 6405-2.1993)
GB/T 8595 moving machinery handling (GB/T 8595-2001, eqv ISO 10968.1995)
GB 9656 automotive safety glass
GB 9969.1 Instructions General Industrial Products
GB 12265.1 machinery Safety distances to prevent danger zones being reached upper limbs (GB 12265.1-1997, eqvEN294.
1992)
GB 12265.2 machinery Safety distances to prevent (GB 12265.2-2000, eqvEN811 lower limbs danger zones.
1994)
GB 12265.3 Safety of machinery to avoid crushing of parts of the human body minimum spacing (GB 12265.3-1997, eqvEN349.
1993)
GB/T 13306 signs
GB/T 14775 manipulator General ergonomics requirements
GB/T 14781 earthmoving machinery mechanical steering wheel capacity (GB/T 14781-1993, eqv ISO 5010.1992)
GB/T 15706.1-2007 Safety of machinery - Basic concepts, general principles for design - Part 1. Basic terminology, methodology
(ISO 12100-1.2003, IDT)
GB/T 15706.2-2007 Safety of machinery - Basic concepts, general principles for design - Part 2. Technical principles and specifications
(ISO 12100-2.2003, IDT)
GB 16423 metal and nonmetal mine safety rules
GB 16754 Safety of machinery - Emergency stop design principles (GB 16754-1997, eqv ISO /IEC 13850.1995)
GB/T 16855.1 machinery safety control system relating to safety components - Part 1. General principles for design (GB/T 16855.1-
2005, ISO 13849-1.1999, MOD)
GB/T 17299 moving machinery - minimum entry size (GB/T 17299-1998, idt ISO 2860.1992)
GB/T 17300 moving machinery passage means (GB/T 17300-1998, idt ISO 2867.1994)
GB/T 17771 FOPS moving machinery - Laboratory tests and performance requirements (GB/T 17771-1999,
eqv ISO 3449.1992)
GB/T 17922 ROPS moving machinery - Laboratory tests and performance requirements (GB/T 17922-1999,
idt ISO 3471.1994)
GB/T 18153 Safety of machinery - accessible surface temperature Ergonomics data to establish temperature limit values for hot surfaces
GB/T 19670 Safety of machinery - Prevention of unexpected start (GB/T 19670-2005, ISO 14118.2000, MOD)
GB 20651.1-2006 Reciprocating internal combustion engines - Safety - Part 1. Compression ignition engines
JB/T 3683 moving machinery comfort zone and reach for manipulation (JB/T 3683-2001, eqv ISO 6682. 1986)
JB/T 5062 information display device ergonomics general requirements
JB/T 7692 engineering technical requirements (JB/T 7692-1995, eqv ISO 10570.1992) articulated mechanical frame locking device
JB/T 7693 Loader condition with drive shaft assembly
JB/T 7694 construction machinery headlamp
JB/T 8548 construction machinery power shift transmission technical conditions
JB/T 8816 construction machinery drive axle technical conditions
JB/T 10135 construction machinery hydraulic transmission device technology
Performance requirements and test methods JG/T 48 Wheel earthmoving machinery brake system (JG/T 48-1999, eqv ISO 3450.
1985)
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
For the delivery of the ore material or designed in underground mines with self-propelled mechanical tire.
3.2
Passing the examination by the competent authority and authorized personnel mine car driving operation.
3.3
So transported tub brake or standing still all parts of the assembly. The system consists of steering mechanism, transmission and brakes.
3.4
Make transport stops and remains stationary tub main braking system.
3.5
When the service brake system failure that shipped tramcar stop system.
3.6
So that transport carts remain intact system.
3.7
Including cab, additional preparation hangar, FOPS and ROPS and all attachments specified by the manufacturer of a quality
The driver and by the use of the instructions provided to raise the upper limit of the fuel tank, lubrication systems, hydraulic systems and cooling systems of liquid 75kg
The total mass.
4 baseline conditions
Engine baseline conditions should be consistent with GB/T 6072.1 requirements, namely.
--- Relative humidity. r = 30%
If the actual use of the environment and different baseline conditions, in order to ensure the normal operation of the engine, the user should be adjusted according to the manufacturer's requirements.
5 Dangerous List
Yun tub in Table 1 risk factor for its lifetime.
Table 1 Danger List
No. dangerous
1 high-pressure fluid jet
2 transport carts tipping, loss of stability
3 and the related mechanical slip, pouring, drop
4 transport minerals projectile
5 loose coupling
6 moving parts without guards or protective devices designed unreasonable
7 Engine selection incorrect installation, improper maintenance
8 dangerous transmission system to a fault
Table 1 (continued)
No. dangerous
9 tires and rims choose to use, improper maintenance
10 hydraulic system failure
11 electrical contact
12 hot or cold
13 too much noise
14 Vibration
15 poor air quality in the workplace
16 poor lighting
17 emissions exceeded
18 brake failure
19 control system failure, disorders
20 the lack of a warning signal or a warning signal is too weak or too strong
21 Operator fatigue or operational errors
22 moved accidentally shipped tub
23 engine unexpected start, speeding
24 at design time, ignoring the principles of ergonomics
25 Fire
26 improper operation
27 Incorrect Maintenance
6 Safety requirements and/or measures and their determination
6.1 General Requirements
6.1.1 shipped tub used parts should be manufactured in accordance with prescribed procedures approved product drawings and technical documents.
6.1.2 tub design and manufacturing operation should ensure the safe operation during normal use, and should be able to meet the expected physical performance requirements, and should not be
Any risk.
6.1.3 shipped tub should adopt security technical measures to prevent possible overloading, dangerous material defects or other damage arising.
6.2 Safety of machinery -
6.2.1 General requirements
6.2.1.1 all rotating parts exposed and may pose a danger to the operator of the transmission mechanism must install safety signs and safety
Protection. Safety signs shall meet the requirements of GB 2894, the protective device shall comply with GB/T 8196 requirements.
6.2.1.2 All possible because of leakage and an ejection dangerous high-pressure hydraulic, fuel lines, install protective devices, the potential risk reduction
To a minimum.
6.2.1.3 Safety distances to prevent danger zones being reached upper limbs should be consistent with GB 12265.1 requirements.
6.2.1.4 Safety distances to prevent danger zones being reached lower limbs should meet the requirements of GB 12265.2.
6.2.1.5 prevent crushing of parts of the human body should comply with GB 12265.3 minimum spacing requirements.
6.2.1.6 In order to prevent the tub shipped during transport and mobile service should be configured between the front and rear frame hinge frame locking device, locking device
Shall comply with the provisions of JB/T 7692's.
6.2.1.7 The minimum size of each inlet repair parts shall comply with GB/T 17299 of.
6.2.1.8 should ensure the normal operation of transport carts on the slope design, operation and shutdown time, in any direction can not have tipping and sliding
Possible.
6.2.1.9 tub should prevent transport of mineral loaded projectile wounding and affect other ground vehicle operation during transport.
6.2.1.10 shipped tub important moving parts locking bolts to take measures, and regularly check the tightening torque to prevent loose bolts in the job
Fixed accidents.
6.2.2 Engine
6.2.2.1 transported tub should be low-pollution diesel engine, low-pollution diesel engines should meet the safety requirements of GB 20651.1.
Airflow arrangement 6.2.2.2 Engine exhaust system and the cooling system should be fully taken into account the comfort and health of operators.
6.2.2.3 The fuel tank and engine fuel system shall be designed in a suitable location, and ensure that spills or leakage of oil droplets to only a trickle
Surface.
6.2.2.4 in the engine compartment, all fuel, lubricating oil, hydraulic oil lines should be manufactured using fireproof materials and away from hot engine table
Surface or the surface of the steel pipe between the engine/hose with a hot plate or install insulation shields, but the heat shield mounting plate or may not affect the engine compartment
The flow of air.
6.2.2.5 in the engine compartment, the engine exhaust system shall not flame or glowing particles escape.
6.2.2.6 regularly check the air intake system and exhaust system resistance, prevent due to lack of engine intake and exhaust resistance is too large, performance degradation and thermal
And dangerous.
6.2.2.7 Fuel system shall meet the following requirements.
a) fuel tank must be fixed to the manufacture of steel and damaged or hazardous least likely place.
b) fuel tank tightness test must be carried out, that is, at a pressure of at least 20kPa maintain at least 15min there should be no leaks.
c) the fuel tank filler should be readily accessible. When shipped in tub is designed with an inclined surface, jobs, stop, full fuel
Not spill fuel from the fuel tank filler neck.
d) In order to maintain atmospheric pressure within the fuel tank, the fuel tank should be equipped with vent holes, and the use of filtering accuracy of the apparatus and not more than 125μm
Ventilation filters. In order to prevent foreign matter into the tank, you should use the filter accuracy of less than 250μm refueling filter.
e) fuel tank shall be equipped with oil shut-off device.
f) If the fuel pump suction tube leak, the fuel system should be avoided due to gravity or siphon fuel from the tank led to be sucked out.
g) the fuel pipes should be used metal pipe or outside Wire braid hose. Fuel line arrangement should be considered mechanical vibration, corrosion and
Cooling influence. The number of pipe joints should be minimized to reduce the potential for leaks using.
Lowest position h) shall be fitted with fuel tank drain device should be installed fuel tank oil level gauge in place.
i) shipped tub fuel tank capacity should ensure continuous operation time less than a work shift.
6.2.2.8 Engine exhaust pipe installation performance, reliable and muffler exhaust gas purifying apparatus.
6.2.3 Transmission
6.2.3.1 tub shipped the hydraulic transmission, power shift transmission, drive axle, drive shafts must be stable performance, easy adjustment, safe operation,
Easy to maintain.
6.2.3.2 hydraulic transmission apparatus shall comply with JB/T 10135 of.
6.2.3.3 power shift transmission should be consistent with JB/T 8548 requirements.
6.2.3.4 drive axle should be consistent with the provisions of JB/T 8816's.
6.2.3.5 shaft shall comply with JB/T 7693's.
6.2.4 tires and rims
Tire shall comply with GB/T 1190 and GB/T 2980, the rim should be consistent with the provisions of GB/T 2883's. We must comply with the tires
Rim manufacturer's recommended use and maintenance methods, safety procedures, to ensure transport safety tub and operation and maintenance personnel.
6.2.5 Hydraulic System
6.2.5.1 the hydraulic system should be consistent with GB/T 15706.2 and GB/T 3766 the relevant safety requirements.
6.2.5.2 When shipped tub hydraulic circuit work, the working pressure must not exceed the circuit maximum pressure rating.
6.2.5.3 hydraulic circuit can not because of pressure fluctuations (pressure rise, loss, decline) and dangerous.
6.2.5.4 hydraulic circuit can not because of leakage or damage to the hydraulic components and the risk of hydraulic oil discharged hose sudden movement occurs.
6.2.5.5 hydraulic system hose, tube and pipe fittings should have sufficient strength, piping layout should consider transport and movement and then rotating tub
Installation position in inspection and maintenance, the pipeline will not be affected or other hot engine parts, should not affect the electrical unprotected nearby
Wire, cable. Otherwise, to take quarantine measures.
6.2.5.6 hydraulic system pressure relief valve must be installed if the valve is adjustable, it should have a lock and prevent any arbitrary adjustment
Measures.
6.2.5.7 When the working pressure in the hose 5MPa above, the working temperature above 50 ℃, and from the driver's seat when less than 1m,
It must be added a guard should be strong, to protect the driver from injury hose burst suddenly arising, should not block the oil to splash to the operator
Body.
6.2.5.8 hydraulic tank filler should be located in person standing on the ground easily accessible place, otherwise, shall be provided with the appropriate tools or equipment
Convenient to the hydraulic fuel tank. When shipped in tub is designed with an inclined surface or stop operation, the hydraulic tank filler cap should ensure
Filled with hydraulic oil tank can not overflow when bumpy hydraulic oil from the oil filler.
6.2.5.9 in the vehicle should be equipped with a monitor oil temperature, oil temperature when the oil temperature near the top of the manufacturer's instructions to the police.
6.2.5.10 all hydraulic components, in particular the hose and pipe shall be adequately protected to prevent damage to the external force.
6.2.5.11 in the lowest position on the hydraulic tank drain plug should be set.
6.2.5.12 hydraulic tank oil level should be set with a mechanical protection.
6.2.5.13 accumulators shall comply with the following requirements.
a) can not be welded, welding or machining on the accumulator.
b) accumulator should be installed to facilitate inspection, repair place, and away from heat.
c) the accumulator charge is not only filled with nitrogen oxygen, so as not to cause an explosion.
d) must accumulator firmly fixed to the bracket to prevent injuries from flying accident occurred when the accumulator is disengaged from the fixed point.
e) does not allow disassembly in the accumulator oil-filled state.
f) non-isolated accumulator bladder-type accumulator and principles should port down inflation valve mounted vertically upwards.
6.3 Electrical Equipment
6.3.1 General requirements
6.3.1.1 Design of electrical equipment, manufacture and installation shall comply with the provisions of GB 5226.1.
6.3.1.2 In addition to the cable between the battery and the starter motor, and all other circuit should be protected using a suitable fuse or
Use protective devices GB 5226.1-2002 Protection in 7.2, 7.3.
6.3.2 Wire & Cable
Safety requirements 6.3.2.1 Wire & Cable should comply with the relevant requirements of GB 5226.1-2002 in Chapter 13.
6.3.2.2 In addition to the armored cable or other cable protective measures should be adopted between the power line and the fuel, lubricating oil and hydraulic oil lines
By masking or isolation protection to keep at least a distance of 150mm.
6.3.2.3 cable installation should not because of vibrations caused by the insulating layer wear or fatigue as a result of bending the cable insulation is damaged.
6.3.3 Battery
6.3.3.1 batteries should be consistent with GB/T 5008.1 requirements.
6.3.3.2 batteries should be placed in sturdy, ventilation and fire inside the battery, the battery box should be placed away from heat, minimum vibration, from
Recently starter motor, easy maintenance areas.
6.3.3.3 should ensure that the battery cover and battery compartment battery inside and outside vent adequate ventilation to prevent normal operation transported tub
Hydrogen and oxygen due to battery savings caused risk of bursting.
6.3.3.4 batteries should be fixed firmly to prevent the transport tub bumpy shift in the normal operating conditions and loosen the terminal.
6.3.3.5 Battery cover sufficiently rigid, metal cover over the inner surface should be at least 30mm away from the live parts of the battery.
6.4 operating environment
6.4.1 Temperature
6.4.1.1 If more than GB/T 18153 stipulated the hot surface temperature limit caused by exposure to hazardous surfaces, these surfaces should be equipped with guardrails
Or cover.
6.4.1.2 When the job site temperature is below -5 ℃ or above 35 ℃ should take safety measures for heating and cooling.
6.4.1.3 When a transport tub use in cold environments, should be used in low temperature fuel, hydraulic oil, grease, equipped with a suitable antifreeze
And battery, starter to make starting performance meet the relevant standards; electrical equipment, welding parts, thread sealing material connections should meet
It requires low temperature environment.
6.4.1.4 When a transport tub used in high temperature environment, you want to increase the cooling capacity of the engine cooling system to prevent engine knock. Simultaneously
Prevent tire burst.
6.4.2 Noise
Under the specified conditions of use no-load high-speed operation, the driver operating position of noise limit is not greater than 97dB (A), workplace operations
Continuous exposure to noise 8h person per day, noise level limit of sanitary 90dB (A). If the driver ear noise level is greater than 90dB (A),
Or must take earplugs, earmuffs and other protective measures in Table 2 shorten time workers. But the maximum limit shall not exceed 115dB (A).
Table 2 Noise health standards
Daily noise exposure time/h limit Health/dB (A)
1.5 102
0.5 110
0.25 115 (maximum limit)
6.4.3 Vibration
No-load test run on the road, the driver body vibration limit of not more than 1.15m/s2, contact work vertical, horizontal vibration strength
It shall not exceed defined in Table 3.
Table 3 whole-body vibration intensity limit health
Contact work
Time/h
Health limits
dB (A) m/s2
8116 0.62
4 120.8 1.1
2.5 123 1.4
1.0 127.6 2.4
0.5 131.1 3.6
6.4.4 Air Quality
Job site concentration of harmful gases in the air should meet the requirements of Table 4.
Table 4 harmful gas concentration limit
Harmful gas components Name 8h volume weighted average concentration (10-6)
CO 50
CO2 5000
NO 25
NO2 5
SO2 5
PM 160μm/m
6.4.5 Lighting
6.4.5.1 General requirements
a) transport tub lights should be installed firmly, good and effective, is not allowed due to transport tramcar vibration and loose, damaged, lost or altered light effect
direction;
b) All light switches should be installed securely, switch freely, not allowed to transport tramcar vibration due to its own switch, switch position should be easy to drive
Operates the drive;
c) transport means shall tub mirrors, mounting position and angle should be moderate, the mirror image should be clear, the driver can be in operation
See the case of the rear tub shipped.
6.4.5.2 transported tub lighting configuration requirements
Number of external lighting and signaling devices shipped tub, position, light color and minimum geometric visibility shall be carried out with reference to the requirements of GB 4785
Configuration. Switch position all lighting devices should meet the JB/T 3683 requirements. Switch lighting and signaling devices shall be identified, logo
Graphic symbols shall comply with GB/T 8593.1 and GB/T 8593.2 of.
6.4.5.3 tub before transport, the back light luminous intensity requirements
Tub before the operation, the emission intensity of the back light should be consistent with JB/T 7694 requirements of.
6.4.5.4 transported tub work area lighting configuration requirements
To ensure the safe operation of the underground mine car and staff in transport roadway, roadway intersections and roadway lighting loading area should have its lights
Illuminance values were 2.5lx, 10lx, and 60lx above.
6.5 emissions
6.5.1 The concentration of harmful gases engine exhaust emissions shall comply with the provisions of GB 20651.1-2006.
6.5.2 the engine shall be not more than 0.05% sulfur content, flash point of not less than 55 ℃ of diesel, the condition does not have a temporary place,
Should consult the engine manufacturer, can temporarily use the sulfur content of not more than 0.2% of the light diesel oil.
Source 6.5.3 Mine dust content air required air flow and the wind roadway and mining work shall comply with the provisions of GB 16423.
6.6 Braking System
6.6.1 General requirements for brakes
6.6.1.1 tub underground transport should configure the service brake, secondary brake and parking brake. If the service brake is fully enclosed multi-disc
Wet brakes, the brake hydraulic circuit must be double-loop. If fully enclosed wet spring brake, the brake hydraulic circuit can be single
Loop, but you must configure manual brake pump. If the parking brake may replace auxiliary brake function, it can not set up an auxiliary brake. stop
Brake only by mechanical braking.
6.6.1.2 Brake performance test methods should be consistent with the provisions of JG/T 48's.
Performance req...
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