Many units that order bridge cranes have relatively high procurement requirements and need to formulate comprehensive technical requirements. Some customers may not understand it. The editor will share with you a double girder bridge crane technical requirements for your reference.
There are more requirements for double girder bridge cranes
1. One انقر نقرا مزدوجا شعاع جسر الرافعة with 10t span and 22.5 meters.
2. A set of three-phase four-wire safety sliding contact line, the length is about 240 meters.
3. Partial transformation of the original spare crane current collector (using the same trolley line)
(1) Mainly purchased mechanical and electrical equipment, main structure (omitted)
(2) Product quality inspection records and certificates of conformity;
(3) Installation, use and maintenance instructions and maintenance drawings;
(4) Hook certificate, steel wire rope certificate;
(5) Material certificate of main components;
(6) Design and manufacturing materials:
(7) Use and maintenance instructions;
(8) A full set of as-built drawings (electrical schematic diagram, wiring diagram, electrical layout diagram, general assembly diagram, component assembly diagram, vulnerable parts diagram, etc.);
(9) Heat treatment reports on gears, wheels, brake wheels, shafts, etc.;
(10) Flaw detection report of shafts and important parts (such as hooks, etc.) subjected to bending;
(11) Flaw detection report of main welds;
(12) Derusting quality of main structural parts and inspection records of paint film thickness;
(13) Reducer (omitted)
(14) List of purchased equipment and parts;
(15) List of standard parts;
(16) Complete machine inspection and test record table;
(17) Crane quality certificate.
Tonnage 10t
Quantity 1
Crane form hoisting machine trolley double beam crane
Work level, complete vehicle, 24-hour work system
Working environment temperature -10—50℃
Motor insulation class F
Gauge 22.5 m (span of workshop 24m)
Large car beam structure box type (with maintenance walking platform on both sides)
Lifting height 6 m
Mode of operation: driver driving
Cart speed 0-63 m/min
Trolley speed 0-20 m/min
Lifting speed 6.3/1.1 m/min
Power supply AC 380v 50Hz
Illumination One under-bridge illuminator that can move with the trolley, each on both sides
Hook C-shaped P-class (to ensure that the sling is convenient to hang)
Anti-collision form, large car anti-collision block + photoelectric anti-collision
3. Bridge (omitted)
3.1 Trolley: The trolley is composed of a trolley frame, a lifting mechanism, a running mechanism, a limit switch, etc., and it is easy to disassemble and assemble, taking into account the maintenance space. Conductive form of the trolley: the pulley drags the cable to conduct electricity.
3.2 Trolley frame: It adopts steel or steel plate welded structure, which has sufficient rigidity. The trolley frame adopts integral boring process. The wheel set is directly installed on the trolley frame without adjustment and easy to replace. Platforms and railings are provided around the frame. , There are inclined or straight ladders up and down, safety rulers are installed at the lower part of both sides, and buffers are installed at the front and back. The components on the trolley frame ensure the assembly quality. After all the equipment on the upper part of the trolley is installed, it must not exceed the outer edge of the driving beam. For the convenience of inspection, repair and wheel replacement, the jack fulcrum position is set. The trolleys are equipped with buffers, the buffers are made of polyurethane buffers, and the trolleys use cross-limiting.
3.3 Lifting mechanism: the main lifting mechanism (omitted). When lifting heavy objects to the limit position, the limit switch will automatically act, and the control circuit will be cut off in time to prevent malfunction.
3.4 Trolley operating mechanism: The trolley operating mechanism adopts centralized drive, including wheel sets, couplings, reducers, hydraulic push rod brakes, motors, etc.
3.5 Trolley (omitted): It is composed of components such as trolley running (omitted). Cart (omitted), limit (omitted). The cart end (omitted).
3.6 Structure: The crane has sufficient rigidity, its static camber is guaranteed to be (0.9-1.4)L/(omitted), and the maximum camber shall be controlled within the range of S/10 in the middle of the span. The dynamic and static load tests are in accordance with national standards. Load 1.1 times, static load 1.25 times, the deflection of the main beam at the center of the rated load shall not be lower than the horizontal line. The structure is composed of main beam, end beam, driver's cab, and walking platforms, platforms, ladders, cages, etc. set up for the work of operators and maintenance personnel. The important butt welds are all subjected to non-destructive testing after welding, using X-ray testing or ultrasonic testing respectively, and different testing methods are used for different components and different parts according to national standards. The quality level meets the latest national standards. All weldments shall be derusted, sprayed, and painted as required. The film thickness meets the national standard, and is approved (omitted).
3.7 Main beam: The horizontal side bend of the main beam is not greater than S1/****, and can only be curved toward the side of the aisle platform. Box-shaped structure is adopted. The bottom of both ends of the beam is equipped with a cart operating mechanism, and electrical equipment is installed in the cab , In order to reduce vibration and run smoothly, the two track ends are equipped with trolley stoppers and buffers. The bridge frame is equipped with ladders, railings, doors and platforms for operators and maintenance personnel to enter and exit up and down.
3.8 End beam: (omitted)
3.9 Driver's cab and electrical room: The driver's cab is formed by bending and welding iron plates, which conforms to (omitted). The surroundings are sealed, the glass is single-layer tempered glass, and the field of vision is wide. Seats and controllers are installed indoors. Aucma air-conditioning is installed in the cab, and the cab is insulated with double layers. Set up an electrical room to place all electrical control equipment. Insulating interlayers are arranged on the inner walls of the main beam electrical room and filled with insulating materials to reduce the influence of heat radiation caused by the outside world. Install sealed doors at both ends. The upper part of the door is equipped with double-layer safety tempered glass for observation. A lock and handle are set on the door, and the door opens outward. The height of the cab from the ground must not be lower than the height of the existing crane cab from the ground. In order for the maintenance personnel to maintain the electrical equipment normally, the electrical room should be larger than 600mm**, and the clearance height should not be less than 1.8m (including the height of the hole at the stiffener plate). The walkway surface is made of patterned steel plate, and the steel plate (omitted), the walkway is flat without steps. In electrical (omitted), railings and (omitted). Main beam electricity (omitted), ensure the room (omitted), make the electrical (omitted), always able (omitted), and at the same time (omitted). Electrical room (omitted). In the electrical (omitted), set on the fixed bracket.
3.10 Walking platforms, platforms, ladders and railings: all manufactured in accordance with relevant safety regulations and design specifications, the width of the walking platforms, platforms and ladders shall not be less than 600mm, the slope of the ladder shall not be greater than 55 degrees, and the treads shall be made of patterns with good anti-slip performance. Steel plate, the height of the railing is not less than ****mm. There shall be no less than 80mm safety enclosures around the walking platform and platform. The upper rail of the trolley is detachable so that the reducer can be moved out sideways during maintenance.
3.11 Main driving equipment and requirements for important parts:
3.11.1 Motor (omitted).
3.11.2 Deceleration (omitted)
3.11.3 Both the brake lifting mechanism and the operating mechanism adopt hydraulic push rod brakes.
3.11.4 Frequency converter (omitted).
3.11.5 Small cable (omitted)
3.11.6 Hook and hook group: the hook adopts the P extremely strength pulley and the Q345 (16Mn) steel plate rolling pulley, and all are equipped with anti-decoupling devices.
3.11.7 Bearing**Bearing
3.11.8 Steel wire rope The steel wire rope adopts GB/T (omitted) 19) hemp core type, and the safety factor of the steel wire rope conforms to the requirements of the GB (omitted) machine design specification. Adopt Baosteel products. The safety factor of the steel wire rope is selected above 7 in accordance with national standards.
3.11.9 Wheel set The wheel material is 65Mn, and the wheel axle is 40Cr or 42Cr Mo. Both large and small wheels use double-rim wheels,
3.11.10 Coupling The low-speed transmission of the cart adopts a forged coupling, and the lifting brake wheel is of cast steel type.
3.11.11 Safety device Safety device GB (omitted) Safety Regulations for Heavy Machinery" are implemented, and the buffers of the cart are all spring-type.
3.11.12 Lifting limit The lifting limit shall be protected by the rotation limit and the heavy hammer limit. All the lifting limit switches meet the requirements of safety regulations.
3.11.13 Operation limit The operation mechanism of large and small cranes is equipped with terminal limit protection.
3.11.14 The main and auxiliary lifting mechanisms of the overload protector are equipped with overload protection devices.
3.11.15 Fault protection The main and auxiliary lifting mechanisms are equipped with the fault protection function of the forward and reverse contactor.
3.11.16 The large and small car bodies adopt frequency conversion speed regulation, and the frequency converter and PLC are all selected from Siemens products
3.11.17 Power supply (omitted).
3.11.18 (omitted): Using Party A’s existing rails, Party B shall design and be responsible for the maintenance and adjustment of the rails according to the existing rails to meet the requirements of use.
The main national and ministerial standards are:
GB (omitted) Heavy Machinery Design Code
GB****-**** Safety Regulations for Lifting Machinery
GB/T (omitted) bridge crane
GB****-86 Specification for inspection and scrapping of steel wire ropes for hoisting machinery
GB (omitted) heavy machinery test specifications and procedures
GB****-87 Universal Bridge (omitted)
GB****-88 Rust grade and derusting grade of steel surface before painting
GB (omitted) Cross-cut test of paint and varnish film
JB/T****-94 General purpose bridge crane product quality classification
(Omitted) -88 lifting hook
JB/T****.1-****.3-93 Electricity (omitted)
(Omitted) -87 Casting reel for crane
JB/T****.1-****.2-92 Crane wheels
GB (omitted) wire rope clip
JB/T (omitted)-94 electro-hydraulic block brake product quality classification
ZBJl (omitted) heavy machine reducer
GBJl7-88 steel structure design code and welding and inspection code
GBl (omitted) bevel gear (omitted)
GBl497-85 basic standard for low-voltage electrical appliances
GB (omitted) Code for Construction and Acceptance of Heavy Equipment Installation Engineering
GB/ZQ (omitted) used bridge crane product quality classification
GB/T****-97 Crane Electric Control Equipment
GB (omitted) Three-phase asynchronous electric motor with wound rotor for gold and hoisting
JB/DQ****-86 crane console
JB/ZQ (omitted) heavy machinery electrical control diagram
The above standards (or those not listed) shall be implemented in accordance with the latest relevant national standards. Ensure that Party A completes the registration in the Quality Supervision Bureau.
5.1 Power
The crane power supply adopts a 3-phase 3-wire + PE line 380V, 50Hz power supply. The power supply is led by a slip wire (omitted). A separate lighting transformer is provided. Both the primary end and the secondary end of the transformer are provided with circuit breaker protection, and the secondary end needs to be grounded for lighting and maintenance sockets. And auxiliary circuit provides 220V and 36V power supply, and provides 220V control power supply for the control circuit.
5.2 Power supply mode
The power supply of the trolley adopts a light safety trolley wire with an insulating sheath, and the current collector adopts a double-brush structure (the current vehicle is used as a spare vehicle, and Party B is responsible for transforming the current collector, and the trolley is used in combination). The power supply of the trolley adopts a cable suspension form. The cables entering the terminal box of the trolley are laid in cable troughs.
5.3 Distribution protection
The power distribution system is composed of isolating switch, main circuit breaker, main power contactor and the lines of each mechanism, so that it can be isolated and repaired when a fault occurs, without affecting the operation of other branches, and reducing the impact of the fault to a minimum. In the power distribution control loop, there are links such as the start, stop, electric lock, emergency switch, power indication, safety switch and emergency limit switch of the whole machine power supply, and short-circuit, over-current, over-load and voltage-loss protections. When the power supply is interrupted, the main circuit is automatically disconnected. Each mechanism is equipped with zero position protection. After the fault is restored, if the operating handle does not return to the zero position, each mechanism cannot start by itself.
5.4 Lighting
There are lighting lights in the driver's cabin, and the crane's main beam (shockproof LED lighting on the upper part and shockproof LED spotlight on the lower part, 4 on each side), and maintenance sockets on the driver's cab and the crane's main beam.
5.5 Mode of operation
The start, stop, emergency stop and all mechanisms of the power supply can be centrally operated in the driver's cab. Adopt master switch and control panel.
5.6 Warning: (omitted)
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