Part 5: Bridge and Gantry Cranes
This part of GB 6067 specifies the basic safety requirements for the design, manufacture, installation, modification, maintenance, use, inspection, and scrapping of bridge and gantry cranes (hereinafter referred to as cranes).
The wooden part is suitable for the bridge type crane determined in GB/T 20776.
If it does not involve the special issue of the safety of the book. This section can also be used as a reference for other lifting appliances.
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) applies to this document.
GB/T 1591-2008 Low-alloy high-strength structural steel
GB 2970 2004 Ultrasonic Inspection Method for Thick Steel Pole
GB/T 3323 Radiography of welded joints of metal fusion welding
GB/T 3805-2008 Extra low voltage (ELV) limit
GB/T 3811-2008 Crane Design Code
GB 3836.1 Explosive Atmosphere Part 1: General Requirements for Equipment
GB 3836.15 Electrical Equipment for Explosive Gas Environment Part 15: Electrical Installation in Hazardous Locations {Except Coal Mines)
GB 6067.1 2010 Safety Regulations for Lifting Machinery Part 1: General Rules
GB 8918 Wire Rope for Important Uses
GB 12476.1 Electrical equipment used in combustible dust environment Part 1: Electrical equipment protected by enclosure and limited surface temperature Section 1: Technical requirements for electrical equipment
GB 12476.2 Electrical Equipment for Combustible Dust Environment Part 2: Selection and Installation
GB 15052 General rules for crane safety signs and dangerous pavilion symbols
GB/T 20303.5 Crane Driver's Cab Part 5: Bridge and Gantry Cranes
GB/T 20776 Classification of lifting machinery
GB/T 20878 Stainless steel and heat-resistant steel grades and chemical composition
GB/T 27546 Hoisting machinery pulley
JB/T 6406 Electric hydraulic drum brake
JB/T 7020 2006 Electric hydraulic disc brake
JB/T 8110.2 Crane rubber buffer
JB/T 9008 (all parts) electric wire rope hoist
JB/T 10559 Hoisting machinery element damage testing, ultrasonic testing of steel welds
JB/T 10833 Polyurethane buffer for crane
3.1 Basic requirements
It shall meet the relevant regulations in Chapter 3 of GB 6067.1 2010.
3.2 Metal structure
When the lower flange of the load-bearing structural member is used as the رافعة المسار, and the thickness is reduced to 10% of the design value of the flange thickness, if it cannot be repaired, it shall be scrapped.
3.3 Materials
The steel selection of the crane's load-bearing structural members should meet the requirements of GB/T 3811 2008 in 5.3.
3.4 Channels and platforms
3.4.1 For starters working outdoors, measures to prevent accumulation of water should be taken on passages and platforms.
3.4.2 The aisle and platform treads should have anti-slip properties.
3.5 Inclined ladder
When the height of the inclined ladder is greater than 10 m, a rest platform shall be set every 5 m~10 m.
3.6 Anti-radiation heat device and fire board
3.6. 1 The bottom of the driver's cab directly exposed to heat radiation of the crane for lifting molten metal or hot objects shall be provided with a heat radiation protection plate.
3.6.2 Cranes for lifting molten metals or hot objects (except for cranes with the following flanges as running tracks) directly exposed to radiant heat at the bottom of the main beams and lifting beams shall be equipped with radiant heat protection devices.
3.6.3 For cranes that use the following flanges as the running track and lift molten metal or hot objects, a heat radiation device should be provided at the bottom of the drafting trolley.
3.6.4 The anti-heat radiation board should be equipped with reliable anti-falling measures.
3.6.5 For cranes directly affected by flames (such as steel mill feeding span casting cranes), it is advisable to install fire-proof panels at the main structural parts that are directly burned by flames.
3.6.6 The wiring positions of the channels and platforms directly exposed to radiant heat of the crane that lifts molten metal or hot objects should be provided with a thermal insulation layer.
3.6.7 For cranes that lift molten metal or hot objects, protective measures should be taken for electrical equipment directly exposed to radiant heat.
3.7 Driver's cab
3.7.1 The driver's cab should meet the requirements of GB/T 20303.5.
3.7.2 The layout of the driver's cab should be easy for the driver to operate, and it should be ensured that all operating handles are within the driver's control range when the driver is facing the spreader service area or facing the direction of the driver's cab.
3.7.3 The layout of the driver's cab should ensure that the spreader can be seen by the driver at any position in the service area. If the driver cannot see the spreader at a specific design position, auxiliary measures should be taken to allow the driver to indirectly see or understand the position of the spreader.
3.7.4 The driver's cab should be equipped with door locks, fire extinguishers and electric bells (or alarms). If necessary, a communication device should also be installed.
3.7.5 The driver's cab should not be installed in a location with relatively high vibration.
3.7.6 The mobile driver's cab should be equipped with safety hooks or other fall prevention safety devices.
3.7.7 The distance between the pick-up device and the outer corridor of the driver’s cab should not be less than 0.4m under any circumstances; and when the lifting spreader may collide with the bottom of the driver’s cab, the lifting mechanism should be equipped with a deceleration device to decelerate The safe distance between the lifting spreader and the cab after stopping shall not be less than the 2.5 s stroke at the lowest speed of the hoisting mechanism.
3.7.8 Cranes with insulation requirements . When there is a situation where hydrogen fluoride gas corrodes the glass and affects the driver's sight, the glass in the driver's cab should be easy to replace.
3.7.9 The crane for lifting molten metal or hot objects shall adopt a closed driver's cab. An effective thermal insulation layer shall be provided, and the thermal insulation layer shall be made of flame-retardant material.
3.7.10 The self-propelled mobile driver's cab should be equipped with limit limit switches.
4.1 Basic requirements
It shall meet the relevant regulations in Chapter 4 of GB 6067.1 2010.
4.2 Institution
4.2.1 For cranes with wired control on the ground, the operating speed of the large and small vehicles should not be greater than 50 m/min.
4.2.2 Measures should be taken to ensure that the wheel or wheel bearing is broken or the wheel shaft is broken. The drop distance of the trolley frame and the bridge frame shall not exceed 0.025 m.
4.2.3 The main hoisting mechanism (except electric hoist) of the crane for lifting molten metal shall meet one of the following conditions,
a) The main hoisting mechanism is equipped with two sets of driving devices, which are rigidly connected to the output shaft;
bl The main hoisting mechanism is equipped with two sets of driving devices. When there is no rigidity continuous on the output shaft or when the main hoisting mechanism is equipped with a set of driving devices, a safety brake should be set on the wire rope coil;
Note: Two sets of driving devices refer to two motors, two sets of deceleration systems, one or more sets of winding devices and four sets of brakes.
c) For cranes with a rated lifting capacity not greater than 16 t, the working level of the hoisting mechanism should be at least 2 levels higher than that required by the actual operating conditions, and the minimum working level should not be lower than M5.
4.2.4 For cranes for lifting molten metal, the steel wire of the main hoisting mechanism shall meet the following regulations:
a) A four-wire rope winding system shall be adopted for double lifting points;
b) At least two steel wire rope winding systems shall be used for single lifting point;
c) The safety factor should comply with the relevant regulations in GB/T 3811, for cranes with a rated lifting capacity not greater than 16 t. Its safety factor should not be less than 5.6.
4.2.5 For cranes that lift molten metal, the steel wire rope winding system of the main hoisting mechanism shall not adopt balance pulleys.
4.2.6 Electric hoist can be used as the hoisting mechanism when the rated lifting capacity of the molten metal is not more than 16 t . The electric hoist should meet the requirements of JB/T 9008 (all parts) and the following requirements :
a) When the rated lifting capacity is greater than 5t, the electric hoist should be equipped with a safety brake in addition to a working brake. The safety brake is set on the low-speed level of the electric hoist. When the working brake fails or the transmission component is broken, it can reliably support the rated load.
b) When the rated lifting capacity is less than or equal to 5t, in addition to a working brake, the electric hoist should also be equipped with a safety brake at the low speed level. Otherwise, the electric hoist should be designed at 1.5 times the rated lifting capacity.
c) Use electric hoist with high temperature insulation function.
d) The working level of electric hoist should not be lower than M6.
4.2.7 Crane for lifting vertical and throwing heat treatment process workpieces. The brake of the lifting mechanism shall be equipped with an emergency release device.
4.2.8 The objects lifted by the forging crane are placed on the supporting surface. Withstand regular impact loads and produce vertical displacement. The corresponding lifting mechanism should be equipped with a buffer device and a brake release mechanism.
4.2.9 Crane operating mechanism and trolley operating mechanism with explosion-proof requirements. It should be stable during starting and braking, and should be able to avoid wheel skidding and visible sparks. The contact surface of the wheel and the track should be kept rust-free and in good contact to avoid sparks due to rust.
4.2.10 When the explosion- proof classification of the explosion-proof bridge crane is IIC, IIIB, IIIc, the operating speed of the crane and the crane should not exceed 16m/min, and the operating speed of the crane and the other explosion-proof classification should not exceed 25 m/min; crane lifting The speed should not exceed 8 m/min, and the wire rope winding speed should not exceed 28 m/min. The running speed of the explosion-proof beam crane should not exceed 25 m/min.
4.2.11 The crane drum and hook pulley group with explosion-proof requirements should be designed so that when the wire rope is wound into or out of the drum, the angle of the wire rope from both sides of the spiral groove should not be greater than 3.
4.2.12 For cranes with coal-proof grades of IIC, IIIB, and IIIc, if open gear transmission is adopted, non-sparking materials shall be used.
Note: Cranes with explosion-proof requirements refer to cranes that work in explosive gas environments and explosive dust environments.
4.3 Parts
4.3.1 Wire rope
4.3.1.1 When multiple (even-numbered) wire ropes are used for the hoisting mechanism, wire ropes with symmetrical rotation should be selected and arranged symmetrically.
4.3.1.2 The crane for lifting molten metal or hot objects shall use high temperature resistant steel wire rope with a performance not lower than the metal rope core or metal strand core specified in GB 8918.
4.3.1.3 Cranes for lifting molten metal . The safety factor should comply with the relevant regulations in Table 44 of GB/T 3811 2008. For cranes with a rated lifting capacity not greater than 16 t, the safety factor shall not be less than 5.6.
4.3.1.4 Cranes with explosion-proof requirements shall use steel wire ropes with a performance not lower than that specified in GB 8918. The safety factor of the wire rope shall be one level higher than the safety factor specified in Table 44 of GB/T 3811 2008.
4.3.1.5 On 1st, when multi-layer winding, card I shall be adopted; the energy shall not be lower than the steel core wire rope specified in GB 8918.
4.3.2 Reel
Multi-layer winding drums should have flanges to prevent the wire rope from slipping off the end of the drum. When the wire rope is completely wound on the drum, the flange should exceed the outermost layer of wire rope, and the height of the excess should not be less than 1.5 times the diameter of the wire rope.
4.3.3 Pulley
4.3.3.1 Gray cast iron pulleys should not be used for lifting molten metal.
4.3.3.2 Rolling pulleys are recommended for metallurgical cranes. When casting pulleys are used, they should meet the requirements of GB/T 27546.
4.3.3.3 The pulley groove should be smooth and clean, and there should be no defects that damage the wire rope.
4.3.4 Brakes
4.3.4. 1 Cranes with explosion-proof requirements should use explosion-proof brakes. Except for the explosion-proof crane with electric hoist as its mechanism, the lifting mechanism of other explosion-proof cranes should be equipped with two sets of brakes.
4.3.4.2 The brakes used in corrosive environments should adopt anti-corrosion brakes. The anti-corrosion technical conditions shall not be lower than the anti-corrosion requirements specified in 5.5.1.2b of JB/T 6406 and JB/T 7020 2006.
4.3.5 Spreader
4.3.5.1 For the welding fork of a crane for lifting molten metal, its force direction should be consistent with the direction of the rolled fiber extension of the steel plate, and the mechanical properties of the steel plate should not be lower than the Q345B steel plate in Table 1 of GB/T 1591-2008.
4.3.5.2 There should be no butt weld on the lower flange plate of the lifting beam of the crane for lifting molten metal.
4.3.5.3 The main load-bearing parts in the lifting beam of the crane for lifting and transporting molten metal, such as the side plate of the pulley block, the lifting lug plate, etc., when the plate thickness exceeds 0.04m, the ultrasonic inspection shall be carried out before the material is cut, and shall reach GB/T Class I quality specified in Table 4 in 2970-2004.
4.3.5.4 For cranes that lift molten metal, measures should be taken to protect the wire ropes from the direct influence of radiant heat at the hook group and lifting beams, and to prevent molten metal from splashing onto the wire ropes.
4.3.5.5 When the hot objects lifted by the crane need to enter the liquid medium, measures should be taken to prevent liquid splash at the moving pulley block of the hook.
4.3.5.6 The rake crane used for handling and stacking rod-shaped billets in the continuous casting and rolling process of steel mills. The coarse teeth of the material rake should be made of steel with material properties no less than Q345 in Table 1 of GB/T 1591 2008. The butt weld of the rake teeth should be thoroughly welded and annealed after welding. The radiographic inspection should meet the requirements in GB/T 3323. Quality requirements for BII welded joints; ultrasonic testing shall meet the quality requirements of Grade 1 in JB/T 10559.
4.3.5.7 For cranes with anti-magnetic requirements, the hooks should be made of anti-magnetic materials, and the mechanical properties of the materials should not be lower than 0Crl8Ni9 in GH/T 20878.
4.3.5.8 For cranes with explosion-proof requirements, when the explosion-proof classification is IIC, IIIB, or IIIC, the hook shall take measures to prevent dangerous sparks from impact or friction.
4.3.5.9 The outer surface of the side plate of the crane hook pulley block with explosion-proof requirements should be marked with warning words. Such as "no contact with the ground, collision" and so on.
4.3.6 Buffer
For crane buffers with explosion-proof requirements, polyurethane buffers complying with JB/T 10833 or rubber buffers complying with JB/T 8110.2 should be selected, and the surface resistance should not be greater than 10 ninth-square ohms.
4.3.7 Wheel
When the explosion-proof classification of cranes with explosion-proof requirements is IIC, IIIB, or IIIC, the wheel treads and rim parts should be made of copper alloy or other materials that will not ignite explosive gas mixtures due to impact or friction.
4.3.8 Other
4.3.8. 1 The touch wheels and the rollers of the cable trolleys on the lifting limit switches with explosion-proof requirements shall be made of bronze or brass or engineering plastics with a surface resistance of no more than 10 ninth-square ohms. The explosion-proof classification is IIC, When class IIIB, IIIC. The traction line of the cable trolley should be made of stainless steel wire rope.
4.3.8.2 For cranes with explosion-proof requirements, the joints of the trolley running track should be welded; the crane track should be welded, and the joints should be smooth and flat. The joints that are not welded should have no lateral misalignment and height difference. If it is greater than 0.5 mm, the gap should not be greater than 1 mm, and the crane and trolley should be subject to impact when passing through the joint.
The hydraulic system of the crane shall comply with the relevant regulations in Chapter 5 of GB 6067.1 2010.
6.1 General
6.1.1 The electrical part shall comply with the relevant regulations in Chapter 6 of GB 6067.1-2010.
6.1.2 The electrical equipment of the crane must ensure that the transmission performance and control performance are accurate and reliable. The selection of electrical equipment and components of cranes with explosion-proof requirements should meet the requirements of the corresponding explosion-proof level. If the electrical components are selected as non-explosion-proof, explosion-proof enclosures should be added or explosion-proof measures should be taken to meet the requirements of the corresponding explosion-proof level. For cranes with strong magnetic fields, dust, and corrosive environments, the electrical control device should take corresponding measures.
6.2 Power supply and circuit
6.2.1 Power supply
The feeder of cranes and trolleys with explosion-proof requirements should use flexible cables to conduct electricity, and the power supply cables of cranes should use cables with grounded core wires.
6.2.2 Power sliding contact line and its protection
6.2.2.1 The power trolley line usually adopts safety trolley line, rigid trolley line or section steel.
6.2.2.2 When the suspended object (or hook) swings, it should not touch the power trolley wire.
6.2.2.3 The arrangement of rigid trolley wires or section steel should have a sufficient safety distance from the surrounding equipment, or take safety protection measures.
6.2.3 Power supply contactor
6.2.3.1 The total power supply circuit of the crane should be equipped with a total power supply contactor, which can disconnect the power lines of all mechanisms. When the main circuit breaker installed on the crane can remotely disconnect the power circuits of all mechanisms, the main power supply contactor may not be provided.
6.2.3.2 Between the reversing cash contactor and other contactors that can cause short circuit accidents when they are turned in at the same time, the electric Mechanical interlocking.
6.2.4 Control system
6.2.4.1 The crane control system is to ensure that the control performance meets the requirements of the mechanical and electrical system.
6.2.4.2 When a programmable controller is used to participate in crane control, the interlocking signal for safety protection (such as the end limit of hoisting, overspeed, etc.) and the emergency power off switch shall have a direct relay protection interlock. line.
6.2.5 Lifting electromagnetic chuck circuit
6.2.5.1 For cranes with electromagnetic chucks, the wiring of the power supply of the lifting electromagnetic chucks on the AC side should ensure that the power supply of the electromagnetic chucks is not cut off during various accidents within the crane (the crane current collector is uninterrupted). The hold does not fall off.
6.2.5.2 For the crane with electromagnetic chuck, if the object falls due to power loss during operation, which may cause harm, the magnet retention time of the electromagnet in the power-off state of the crane shall not be less than 15 min.
6.2.5.3 When setting up a backup power source (such as a battery). The automatic charging device and its bottom indicator should be provided at the same time, and there should be lights and ringing warning devices to warn when the slide line loses power, the backup power supply is turned on, or the system fails.
6.2.6 Control of the brake
6.2.6.1 For the brake controlled simultaneously with the motor, when the wire length from the motor to the brake is greater than 5m, the brake circuit should be equipped with a protective device.
6.2.6.2 The brake controlled separately from the motor shall meet the following requirements:
a) Precautions should be taken for the control of the brake to prevent any uncontrolled movement during starting and braking. If there is electric brake, during normal operation. The mechanical brake should be applied after the electrical brake. Except for a short transient state, the brake must not be closed when the motor is energized.
b) The mechanism for lifting molten metal and other dangerous materials M1. The brake control should take measures to prevent control failure due to damage or adhesion of a contactor.
6.2.6.3 The safety brake shall meet the following requirements:
a) For the lifting mechanism with safety brake, during normal operation, the safety brake should be closed after the high-speed shaft brake is closed, and the delay action time is adjustable:
b) Control of the safety brake. Measures should be taken to prevent control failure due to damage or adhesion of a contactor.
6.2.6.4 The braking during unexpected power failure shall meet the following requirements:
a) For situations where the action of the brake during an unexpected power failure of the system will cause damage to the mechanical equipment and tip over, appropriate measures shall be taken to ensure the safe operation of the brake during the accidental power failure;
b) Set up the lifting or pitching mechanism of the emergency driving device, and the working brake of the mechanism shall participate in the braking protection of the emergency driving process.
6.2.7 Branch line power distribution
Breakers, fuses or over-current protection relays should be used for the power, control and auxiliary power branch lines of each mechanism to provide over-current protection. When the three-phase power circuit adopts fuse protection. It shall have the function of phase loss protection.
6.2.8 Emergency stop switch
6.2.8.1 Each lifting appliance shall be equipped with one or more emergency stop switches operated from the operation control station. When there is an emergency, it shall be able to stop all moving drive mechanisms. When the emergency stop switch is in action, the power circuit that may cause the item to fall should not be cut off {such as electric disk, pneumatic holding device). The emergency stop switch should be red and cannot be reset automatically. And should adopt closed-point control. When needed. The emergency stop switch can be additionally installed in other parts.
6.2.8.2 For those hoisting machinery driving mechanisms that may cause incidental hazards, it is not necessary to stop all motion driving mechanisms. For example, for a gantry crane, an emergency stop switch set close to the ground can be used to stop the operation of the crane trolley from the ground.
6.2.8.3 Shipbuilding gantry crane linkage control console, electrical room, upper car room, lower car room and easy-to-operate positions of the crane's rigid and flexible legs shall be equipped with emergency stop switches.
6.2.9 Wires, cables and wiring
6.2.9.1 Cranes with explosion-proof requirements. The connection between electrical equipment should use rubber sheathed copper core multi-strand cable. And no joints are allowed in the middle, and explosion-proof branch lines can be set if necessary.
6.2.9.2 The cables directly exposed to heat radiation on the cranes that lift molten metals and hot objects should use flame-retardant and high-temperature resistant cables or take thermal insulation measures for the cables.
6.3 Electrical equipment used for cranes with explosion-proof requirements
6.3.1 The selection of explosion-proof electrical equipment should meet the requirements of GB 3836.1 and GB 12476.l, and its performance should meet the requirements of the corresponding explosion-proof category and the highest surface temperature.
6.3.2 In addition to explosion-proof electrical equipment used in coal mines, the installation of explosion-proof electrical equipment used in explosive gas environments shall comply with the provisions of GB 3836.15, and the installation of explosion-proof electrical equipment used in explosive dust environments shall comply with the provisions of GB 12476.2.
7.1 The control and operating system shall comply with the relevant regulations in Chapter 7 of GB 6067.1-2010.
7.2 For the slab handling crane, measures should be taken to prevent the slab from falling due to the wrong operation of the clamp opening.
7.3 The controller should meet the following requirements
a) The movement direction of the operating handle should be consistent with the movement direction of the mechanism;
b) The joystick should be equipped with a protective device to prevent the circuit from being switched on due to accidental collision.
7.4 The crane that lifts molten metal or hot objects should use a driver's cab, remote control or non-following operation method away from the heat source, and ensure the operator's operating vision. The crane adopting remote control or non-following operation mode should be provided with safe passage for operators.
8.1 Basic requirements
The basic requirements of electrical protection shall comply with the relevant regulations in Chapter 8 of GB 6067.1 2010.
8.2 Special electrical protection for cranes with insulation requirements
8.2.1 Cranes with insulation requirements should be equipped with three-level insulation {e.g.: insulation between hook and wire rope pulley block, insulation between hoisting mechanism and trolley frame, insulation between trolley frame and bridge frame) , The insulation resistance value of each level should not be less than 1.0 MO.
8.2.2 Cranes with insulation requirements should be equipped with an automatic sound and light alarm device for insulation failure, and the alarm device should be interlocked with the main power switch.
8.2.3 In the non-working state of the crane, the induced voltage on the trolley frame shall not exceed the voltage limit (AC 30V, DC 70V) in the normal (non-fault) state of environmental conditions 3 in GB/T 3805-2008 Table I V).
8.3 Special electrical protection for cranes with explosion-proof requirements
For cranes used in explosive gas and combustible dust environments, the phase-to-phase insulation resistance and ground insulation resistance of the main circuit, control circuit, and all electrical equipment should not be less than 1.5 M ohms
8.4 Overspeed protection
8.4.1 Electronically controlled speed regulation (including SCR stator voltage regulation, eddy current braking, energy consumption braking, SCR power supply, DC unit power supply, etc.) lifting mechanism and planetary differential lifting mechanism shall be provided Overspeed protection.
8.4.2 For cranes that lift molten metals and other dangerous goods, the lifting mechanism shall be equipped with overspeed protection, except for electric hoists with a rated lifting capacity of not more than 5 t.
9.1 Basic requirements
The safety protection device of the crane should meet the relevant regulations in Chapter 9 of GB 6067.1-2010, and the setting requirements are shown in Table A.1 in Appendix A.
9.2 Safety devices that limit the movement stroke and working position
For cranes that lift molten metal, the main lifting mechanism should be equipped with different forms of dual secondary protection devices at the ascent limit position, and can control different circuit breakers. When the lifting height is greater than 20 m, the descending limit position limit should also be set Device.
9.3 Safety device to prevent overload
9.3. 1 For cranes with double or multiple trolleys, each lifting mechanism should be equipped with a lifting weight limiter. When each lifting mechanism is operated independently, the limit value of the lifting weight limiter is the rated lifting capacity of each lifting mechanism ; When the lifting weight of each lifting mechanism exceeds the specified limit value, it should be able to automatically cut off the lifting power source. In combined lifting operations, if the lifting weight exceeds the specified lifting limit value or the lifting of each lifting mechanism exceeds the specified limit value, the lifting weight limiter should automatically cut off the lifting power source of each lifting mechanism, but The agency should be allowed to do descending motions.
9.3.2 Cranes with explosion-proof requirements should be equipped with explosion-proof lifting weight limiters.
9.4 Interlocking protection of double or multiple trolleys
When the same crane double trolley or multiple small armies are linked, two or more small workshops should be equipped with interlock protection: when the height limiter of any lifting mechanism is activated, two or more lifting mechanisms should stop at the same time. When any hoisting mechanism overload protection action. Two or more hoisting mechanisms should stop at the same time; the forward stopper of the front car or the backward stopper of the rear car should stop at the same time.
9.5 Safety brake
9.5.1 For cranes for lifting molten metal, when the main hoisting mechanism (except electric hoist) is equipped with two sets of driving mechanisms and the output shaft is not rigidly connected or when a set of driving mechanism is set, safety brakes should be set on the wire rope drum . For cranes that lift molten metal with a rated lifting capacity of not more than 16 t and greater than 5 t, in addition to a working brake, the electric hoist should also be equipped with a safety brake at the low speed level of the electric hoist. If the rated lifting capacity is not more than 5 t, In addition to a working brake, the electric hoist should also be equipped with a safety brake at the low-speed level of the electric hoist. Otherwise, the electric hoist should be designed at 1.5 times the rated lifting capacity.
9.5.2 The cap changing mechanism of quayside container cranes should be equipped with safety brakes.
9.5.3 The change mechanism of the bridge grab unloader I should be equipped with a safety brake.
10.1 The markings, signs, safety signs, limit size and clear distance of the crane shall comply with the relevant regulations in Chapter 10 of GB 6067.1-2010.
10.2 Safety signs and hazard graphic symbols should meet the requirements of GB 15052. Safety signs and hazard graphic symbols can be placed on the crane or appear in the operation and maintenance manual, in order to avoid danger. The safety signs and hazard graphic symbols should be placed close to the hazardous location or control area.
The crane operation management shall comply with the relevant regulations in Chapter 11 of GB 6067.1 2010.
The selection, responsibilities and basic requirements of personnel shall comply with the relevant regulations in Chapter 12 of GB 6067.1 2010.
The safety of the crane should comply with the relevant regulations in Chapter 13 of GB 6067.1 2010.
The selection of the crane should comply with the relevant regulations in Chapter H of GB 6067.1 2010.
The setting of the crane should comply with the relevant regulations in Chapter 15 of GB 6067.1 2010.
The installation and disassembly of the crane shall comply with the relevant regulations in Chapter 16 of GB 6067.1 2010.
The operation of the crane should comply with the relevant regulations in Chapter 17 of GB 6067.1 2010.
The inspection, test, maintenance and repair of the crane shall comply with the relevant regulations in Chapter 18 of GB 6067.1 2010.
The safety assessment of the crane operating status shall comply with the relevant regulations in Chapter 19 of GB 6067.1-2010.
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