Safety Device of European Overhead Crane

1. The main and auxiliary hoisting mechanisms of the crane are equipped with overload limiters. When the load reaches 90% of the rated lifting capacity, the prompt alarm signal will be sent out; when the lifting capacity exceeds 105% of the rated lifting capacity (adjustable); when the lifting capacity exceeds 110% of the rated lifting capacity, the lifting power supply will be automatically cut off immediately and the prohibitive alarm signal will be sent out. There is a real-time lifting weight digital display in the crane operation room.

2. According to the safety regulations of crane machinery, all exposed rotating parts with danger of personal injury shall be equipped with protective cover and wire rope anti jump device. The form of protective cover is detachable safety protective cover.

3. The platform, walkway and escalator shall be designed and manufactured in accordance with national safety regulations and standards, and shall be set up to facilitate the maintenance and inspection of operators. The ladder steps, outdoor platforms and walking platforms shall be anti-skid. The width of walking platform, platform and ladder shall not be less than 500mm. The walking platform shall be made of checkered steel plate.

4. The crane is equipped with lifting height limiter and running travel limiter, which can realize the safety protection of moving travel and working position through electrical control.

5. The buffer device such as buffer is installed on the crane to buffer the inertia kinetic energy of crane running and braking. At the same time, a stop device is installed at the limit position of each operating mechanism of the crane to prevent the crane from exceeding the limit position. Laser anti-collision device is set between two cranes.

6. The crane is equipped with a rail sweeping device to clean up the sundries on the running track and prevent the crane derailment and other hazards caused by the sundries on the track.

7. The electrical part of the crane is equipped with phase loss protection, phase staggering protection, zero position protection, under-voltageand over-voltage protection, short circuit protection, over-current protection, grounding protection and other electrical protection to ensure that the crane can work stably in a safe state.

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Protection and Indication

The crane is equipped with an emergency power-off switch, which can cut off the main power supply of the crane in case of emergency. The switch is set in the power distribution cabinet.

The motor is equipped with a full-featured protection device, which can effectively protect the over-current, short circuit and other faults of the motor.

The crane is equipped with zero protection, and each transmission mechanism of the crane shall be equipped with zero protection. During operation, if the operation is stopped due to fault or voltage loss, and the power supply is restored, the mechanism shall not act by itself. The mechanism can be restarted only after the controller is manually set back to the zero position.

Loss of voltage protection: when the power supply of the crane is interrupted, all electrical equipment related to safety or not suitable for automatic opening shall be in power off state to avoid automatic operation of electrical equipment after power supply is restored.

For the interlock protection of the bin door switch, the door of the upper and lower cranes from the outside of the crane shall be equipped with a door switch. When people get on and off the crane, the main power supply shall be disconnected.

Overload load limiter: the crane is equipped with overload load limiter, when the load reaches 90% of the rated load, the display will automatically alarm; when the load reaches 105% of the rated load, the lifting machine will automatically cut off the power supply of the lifting mechanism.

Lifting limit position protection device: the lifting mechanism of the hook is equipped with a limit device. When it reaches the limit position, the power supply for lifting will be cut off automatically, at this time, it can only be lowered.

Travel limiter: travel limiter is installed on both sides of the crane and trolley running mechanism. The crane adopts cross paddle limiter. When the crane and trolley run to the limit position, the power supply will be cut off automatically, and they can run in the opposite direction.

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Description of Double Girder Overhead Crane Characteristics

AQ-LH electric hoist double girder overhead crane: This kind of hoist overhead crane is characterized by compact size, low building clearance height, light self weight and low purchase cost. It is mainly used in machining workshop, metallurgy auxiliary workshop, warehouse, assembly workshop and maintenance workshop, etc. generally, it has lifting capacity of 3 ~ 50t, span of 10.5 ~ 31.5m, working level of A3, and working environment temperature of – 20°C ~ 40°C. The operation mode includes ground wired handle, ground wireless remote control, cab operation and the combination of two operation modes.

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AQ-NLH double girder overhead crane: The crane adopts European technology and modular design, and is mainly equipped with European steel wire rope hoist. It has light weight, light structure and beautiful appearance, which can save plant cost. It is widely used in workshops and warehouses of machinery manufacturing, metallurgy, electric power, electronics and other industries, especially in materials handling, parts assembly and other occasions requiring high positioning accuracy. Generally, the lifting capacity is 5-80t, the span is 10.5-31.5m, the working level can be up to A6, and the working environment temperature is – 20°C-40°C. The operation mode includes ground wired handle, ground wireless remote control, cab operation and the combination of two operation modes.

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AQ-QD hook overhead crane: It is mainly composed of crane operation mechanism, trolley assembly (trolley operation, lifting), bridge and electrical equipment. The two ends of the bridge are supported on the elevated track of the plant or the open freight yard through the running device and run longitudinally along the track; the lifting trolley runs transversely along the trolley track on the main beam of the bridge. The double girder crane is widely used in machining workshop, manufacturing workshop, warehouse, stock yard, maintenance workshop and assembly workshop. Generally, the lifting capacity is 5-800t, the span is 10.5-31.5m, the working level is a3-a8, and the working environment temperature is – 20°C-40°C. The operation mode includes ground wired handle, ground wireless remote control, cab operation and the combination of two operation modes. The pick-up device can be hook, electromagnetic suction cup, grab and sling, etc. Meanwhile, the crane parameters and the structure of lifting mechanism shall be adjusted according to the different pick-up devices.

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AQ-YZ casting crane: It is one of the main equipment in the process of steel-making and continuous casting. It is mainly used to mix molten iron from converter feeding span to converter, lift molten steel to the refining furnace or to the rotating ladle platform of continuous casting in the refining span, and it is also suitable for lifting molten metal in various casting processes. Generally, the lifting capacity is 75-320t, the span is 19-28m, the working level is A7, and the working environment temperature is – 20°C-60°C. The operation mode is mainly cab operation.

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AQ-QDY hook overhead foundry crane: The foundry crane is improved on the basis of AQ-QD overhead crane, mainly used for lifting molten metal in metallurgy, casting and other places, with general lifting capacity of 5-74 tons, span of 10.5-31.5m, working level of A7, and working environment temperature of – 20°C-60°C. The operation mode is mainly cab operation. The steel core steel wire rope is used for the steel wire rope, the main beam and the lower part of the cab are provided with heat insulation layer, the trolley cable is provided with high temperature resistant cable, the cab is equipped with cold and warm air conditioning, the motor protection level is required to be IP54, the insulation level is h, and the lifting motor with lifting capacity more than 10 tons must be equipped with overspeed switch.

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Precautions for Roof Design of Steel Structure Workshop

Anti seepage: prevent rainwater from seeping into the metal roof panel from the outside. Rainwater mainly enters into the metal roof through lap joints or nodes. To achieve the function of anti-seepage, it is necessary to use the sealing washer at the screw mouth and then use the hidden fixation, and use the sealant or welding treatment at the overlap of the plate. It is better to use the full-length plate to eliminate the overlap, and use the water-proof treatment with tight abdominal expansion at various joints.

Fire prevention: in case of fire, the metal roof materials will not burn and the flame will not penetrate the metal roof panel.

Wind pressure resistance: resist the local maximum wind pressure, and the metal roof panel will not be pulled off by the negative wind pressure. The wind resistance performance is related to the fastening force of metal roof panel and fixed seat, and the density of fixed seat.

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Sound insulation: prevent sound from outside to inside or from inside to outside. The metal roof layer is filled with sound insulation materials (usually insulation cotton), and the sound insulation effect is expressed by the difference of sound intensity on both sides of the metal roof layer. The sound insulation effect is related to the density and thickness of the sound insulation material. It should be noted that the sound insulation materials have different blocking effects on the sound of different frequencies.

Ventilation: indoor and outdoor air exchange. Set vent on metal roof.

Dampproof: prevent water vapor condensation in the metal roof bottom layer and metal roof layer, and drain the water vapor in the metal roof layer. The solution is to fill thermal insulation cotton in the metal roof layer, lay waterproof membrane on the metal roof bottom plate, and there are ventilation nodes on the metal roof panel.

Bearing: Bear construction load, rainwater, dust, snow pressure and maintenance load. The bearing capacity of the metal roof slab is related to the section characteristics of the slab type, the strength and thickness of the material, the mode of force transmission, and the spacing of purlins (auxiliary purlins).

Lightning protection: lead lightning to the ground to prevent lightning from breaking through the metal roof and entering the room.

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Heat preservation: to prevent heat transfer on both sides of the metal roof, so that the indoor temperature is stable. The thermal insulation function is realized by filling thermal insulation materials (commonly used glass wool and rock wool) under the metal roof panel. The thermal insulation effect is expressed in U value, and the unit is w / m2k. The thermal insulation performance is determined by the following factors: the raw material, density and thickness of the thermal insulation cotton; the humidity of the thermal insulation cotton, the connection mode between the metal roof panel and the lower structure (to prevent the “cold bridge” phenomenon); the repeated ability of the metal roof layer to the heat radiation.

Daylighting: improve indoor lighting by skylight during the day, save energy. When arranging the lighting board or glass at the specific position of the metal roof, the service life of the skylight shall be coordinated with the metal roof panel, and the connection between the skylight and the metal roof panel shall be waterproof.

Beauty: metal roof surface has good texture and pleasant color.

Control thermal expansion and cold contraction: control the contraction displacement and direction of metal roof panel. Ensure that the metal roof panel will not be damaged due to the stress caused by thermal expansion and contraction in the area with large temperature difference.

Anti avalanche: set up a snow barrier on the metal roof of the snowfall area to prevent the sudden sliding of snow.

Anti icicles: prevent rain and snow from forming icicles at cornices.

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Benefits of Crane Maintenance

Crane belongs to large-scale mechanical equipment, which has heavy tasks during operation, and easily causes wear of mechanical transmission system, so it requires operators to check it before use, and maintain it after use. It is necessary to maintain the crane. The purpose of this is to improve the service life of the crane and ensure the safety of the operator. Therefore, the maintenance of the crane can not only improve the working efficiency, but also prevent accidents.

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What Are the Benefits of Doing Crane Maintenance?

  1. It can make the crane often have good technical performance, make each mechanism of the crane work normally and reliably, improve its intact rate, utilization rate and other management indicators, and make the crane in good working condition for a long time.
  2. It can ensure that the crane has good performance, strengthen the protection of structural parts, keep the connection firm, the action and function of electro-hydraulic components normal, avoid abnormal vibration due to mechanical and electrical factors, and meet the normal use requirements of the crane.
  3. Ensure the safe use of the crane. No matter before use, during use or after use, it must comply with its use specifications, so as to better ensure safety. If the equipment is not used in accordance with the operation specifications, resulting in safety accidents, it is not worth the loss. Both customers and businesses are reluctant to see such incidents happen.

Extend the service life of crane more effectively. Some crane manufacturers do not pay enough attention to this aspect, and there is no special person for inspection and maintenance. Only when the crane breaks down can we find the technical personnel of the crane manufacturer to repair it. This will not only affect the working efficiency, but also greatly shorten the life of the crane. Through the maintenance of the crane, the repair interval of the crane or mechanism, including the overhaul period, can be effectively extended, so as to extend the service life of the crane.

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Introduction of Casting Crane

Crane is a kind of multi action lifting machine which can lift and carry heavy objects vertically and horizontally in a certain range. Also known as crane. It belongs to material handling machinery. The working characteristic of crane is to do intermittent movement, that is to say, the corresponding mechanism of reclaiming, moving and unloading in a working cycle works alternately. The development and use of crane in the market are more and more extensive.

The casting crane is used to lift molten metal. The working environment is characterized by high temperature and high dust. The working level is relatively high, generally at A7, and the high level may reach A8. The reliability requirement of the casting crane is much higher than that of the general bridge crane, because the failure of the casting crane may cause great loss and serious consequences.

The casting crane needs to complete the dumping of molten metal and its waste, so at least one set of main hook and one set of auxiliary hook are needed for the casting crane. Each driving device of the hoisting mechanism shall be equipped with at least two sets of brakes, and the safety factor of each set of brakes shall not be less than 1.25. In the hoisting mechanism with special safety requirements, safety brakes shall be installed on the drum to prevent accidents caused by damage of the driving mechanism.

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The steel wire rope of casting crane shall be high temperature resistant steel core steel wire rope, and the conventional hemp core steel wire rope shall not be used, and the safety factor of steel wire rope shall be higher than that of general bridge crane, which shall meet the requirements of relevant casting crane standards. Necessary safety protection devices shall also be provided at the hook group and lifting beam to prevent the steel splashing on the steel wire rope and the damage of the steel wire rope.

Because the casting crane mainly lifts the molten steel with high temperature, the thermal insulation layer should be added under the main beam to reduce the impact of radiation heat on the main beam. At the same time, the trolley should also be designed with fire-proof plate to prevent the fire from jumping over the trolley when loading and unloading the molten steel and damaging the electrical system and equipment.

Casting crane can be said to be a special equipment in special equipment, so whether it is the user or crane manufacturer, we must strictly implement the national specifications, timely do a good job in equipment maintenance, standardized operation, and ensure safe use.

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Preventive Measures for Hoisting Accidents

  1. When transporting objects to the ground at a high altitude, ropes shall be used to tie and hoist them down. During hoisting, it is not allowed to stack or hang sporadic objects on the components. Sporadic materials and objects can only be hoisted and transferred after being bound firmly with cage, steel wire rope and safety rope. Materials, objects and tools shall not be thrown at will to prevent slipping and injuring people or accidents.
  2. The components must be bound firmly, and the lifting point shall pass through the center of gravity of the components. During lifting, it shall be stable to avoid vibration or swing.
  3. When lifting the components, the speed shall not be too fast, and it is not allowed to stay too long at high altitude, and it is not allowed to rise and fall sharply to prevent the components from falling off.
  4. After the components are in place, do not loosen the hook or untie the hoisting rigging before temporary fixing. After the component is fixed, the connection shall be checked for firmness and stability. When the connection is confirmed to be safe and reliable, the temporary fixing tools can be removed and the next lifting can be carried out.
  5. Lifting operation is strictly prohibited in snowy, frosty and rainy days, and sufficient lighting shall be provided for night operation.
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HD European Type Overhead Crane and Hoist

HD single girder crane

The single girder European type crane has the advantages of light weight, compact structure and low energy consumption. European crane adopts a unique design concept, with the characteristics of small size, light weight and small wheel pressure. Compared with the traditional crane, the limit distance from the hook to the wall is the smallest, the clearance height is the lowest, and the lifting height is higher, which actually increases the effective working space of the existing workshop. Because the crane has the characteristics of light weight and small wheel pressure, the new workshop space can be designed smaller and has more complete functions. Smaller plants mean significant savings in initial construction investment and long-term heating, air conditioning and other maintenance costs.

European single girder crane configuration is good, working level can reach A5, the crane import configuration: lifting ABM three in one motor, ABB or SEW operating motor, Schneider electric and frequency converter, imported steel wire rope. The domestic configuration for the crane: Purui lifting reducer, trolley running Saiowi motor, crane running Boneng three in one motor.

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European Electric Hoist

The general layout of the electric hoist is parallel type (C-type structure), that is, the drum device is arranged in parallel with the motor through the reducer, with small limit size, compact structure and high space utilization ratio; working grade is M5, lifting double speed or frequency conversion, fast and accurate positioning, aluminum shell structure, maximum reduction of its own weight, gear inside the motor are processed by grinding teeth, hardness reaches HRC60 or above, accuracy reaches grade 7, making the whole machine performance more stable, efficiency higher, longer life. The product adopts modular design, reasonable stress structure, good grouping, stable starting and braking.

European type electric hoist

All parameters are humanized and easy to maintain; the electric hoist adopts 1 / 4 of the German DIN standard high-strength hook, with compact structure, excellent safety performance and small swing of hoisted objects. The control electrical part is imported from Schneider, with reliable performance, high sensitivity and long service life. Horizontal guide wheel device is designed at both ends to ensure smooth operation of the hoist. The electric hoist adopts the unique design reverse roller device to replace the traditional low clearance hoist counterweight box, effectively reducing its own weight and ensuring the efficient and stable operation of the whole machine. SEW reducer motor B, F, H class insulation, protection class IP54, IP55, IP65. The protection level of wireless remote control handle is IP65, the protection level of electrical part is IP54, and the higher protection level can be customized.

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Protective Device for Crane

1. Distribution protection

The main circuit of crane distribution is equipped with automatic air switch for general power, main contactor and other protection components.

2. Short circuit protection

The general power circuit is equipped with automatic switch as a short circuit protection for the crane. The control circuit is provided with small-capacity automatic air switch as a short protection.

3. Phase sequence protection

The equipment adopt phase sequence protector to monitor the quality of power supply in real time. The control system will cut off the main circuit to protect effectively the safety of equipment and personnel when power supply cause the over voltage, under voltage, phase lack and phase dislocation due to external reasons.

4. Lifting limit protection

The lifting mechanism is equipped with fire stopper for the upper and lower limit, limit switch to ensure that they can automatically cut off the power of lifting mechanism when the hook rises or falls to the limit position.

The counter weight limit switch is also provided for the user to choose, the limit of lifting mechanism is equipped with double protection.

5. Lifting overload protection

Lifting mechanism is equipped with overload protective device and alarm, the overload limiter will send suggestive alarm signal when the load reaches 90% of rated capacity. When the load reaches 110% of rated capacity, it will cut off the power of lifting mechanism at once and send the prohibitive alarm signal. The sensor of overload limiter has the damp proof and anti-seismic function.

6. Limit protection for crane travel

Crane traveling mechanism is equipped with limit switch to ensure that it can automatically cut off the power of travel mechanism when mechanism is horizontally moved to limit position. When several cranes are running on the same track, the photoelectric anti-collision switch is also provided to prevent the collision of two cranes on the same track, which is more reliable and safer.

7. Emergency power-off protection

Control circuit of the crane is equipped with emergency switch. It can cut off the power of control circuit at any time to make the main circuit power off, ensuring the safe operation of the crane when the accident happens.

8. Voltage loss protection

The control circuit of the crane is equipped with voltage loss protective device. When the power suddenly fails or the voltage is too low, main contactor will lock automatically and break, the crane must be restarted after the power is restored.

9. Zero interlock protection in the cab (when there’s cab cam controller and master control)

The crane operated by cab has zero protective device. The zero protective device eliminate the motor running automatically when the power is failure, which can prevent accidents. The power supply of crane is restored after the controller set to zero position.

10. Switch protection safety door of the cab

The switch interlock device of door avoids the personnel or goods dropping from the door because safety door is not closed and the crane is operated suddenly.

11. Ground protection

There are reliable grounding device on the metal structure of the crane, metal enclosures of all electrical equipment, pipe chases and low-voltage side of transformer. The total grounding resistance is not more than 4Ω, insulation resistance to ground at normal temperature is not less than 1MΩ.

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Overhead Crane Structure

The overhead crane is composed of bridge, trolley with lifting mechanism, crane running mechanism and control room etc.

1. Bridge is the basic component of overhead crane, which consists of main beam, end beam and other parts.

The main beam is straddled over the workshop, its two ends are connected with end beams, and the outside of the main beam is equipped with a walking platform and safety  railings.

The bridge is equipped with crane moving mechanism, electrical box, lifting mechanism, trolley running track and auxiliary sliding wire frame. One end of the bridge is equipped with the cab, and the other end is equipped with the main slide wire leading into the power supply.

2. The crane moving mechanism is composed of driving motor, brake, transmission shaft, reducer and wheel.

There are two driving modes: centralized driving and separate driving. Most of our overhead cranes adopt separate driving mode, which has the advantages of light weight, convenient installation and maintenance. The whole crane moves forward and backward along the length direction of the workshop driven by the crane moving mechanism. The trolley running mechanism is composed of trolley frame, trolley moving mechanism and lifting mechanism.

3. The trolley frame is welded with steel plate, and is equipped with trolley moving mechanism, lifting mechanism, handrail and lifting limit switch.

The trolley can move left and right along the track on the main beam of the bridge. Buffer and limit switch are installed at both ends of the trolley moving direction. The trolley moving mechanism is composed of motor, reducer, drum, brake, etc. The motor drives the driving wheel to make the car move after decelerating.

The hoisting mechanism is composed of motor, reducer, drum, brake, etc. the hoisting motor is connected with the reducer through the brake wheel and coupling, and the output shaft of the reducer is connected with the hoisting drum.

4. The control room is the pod for crane operation, also known as the cab. In the control room, there are moving mechanism control devices, lifting mechanism control devices and crane protection devices. The control room is generally fixed at one end of the main beam, and a few are installed under the trolley to move with the trolley. There is a hatch leading to the walking platform above the control room, which is used for the personnel to get on and off when repairing the mechanical and electrical equipment of the cart and trolley.

5. Trolley conductive device (auxiliary slide wire).

6. Crane main power conductive device (main slide wire).

7. AC magnetic control box, resistance box.

8. Track.

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Main Technical Parameters of Bridge Crane

The main technical parameters of the bridge crane are lifting capacity, span, lifting height, running speed, lifting speed, working type and power on duration of the motor, etc

Lifting height: the distance between the upper limit position and the lower limit position of the crane’s spreader or grabbing device (such as grab and electromagnetic suction cup) is called the lifting height of the crane, in meters (m).

Span: the span of the bridge crane refers to the distance between the wheel centerlines at both ends of the main beam of the crane, that is, the distance between the crane track centerlines, in meters (m).

Lifting capacity: also known as rated lifting capacity, refers to the actual maximum allowable lifting capacity of the crane, in tons (T).

The lifting capacity of bridge crane is 5, 10 (single hook), 15 / 3, 20 / 5, 30 / 5, 50 / l0, 75 / 20, 100 / 20, 125 / 20, 150 / 30, 200 / 30, 250 / 30t (double hook), etc.

According to the lifting capacity, the bridge crane can be divided into three grades: small crane of 5-10t, medium crane of 10-50t and heavy crane of more than 50t.

Working type: the working type of crane is determined by its load rate and busy degree, which can be divided into four grades: light grade, medium grade, heavy grade and extra heavy grade.

1.Light grade: Operation speed is low, use times are few, full load opportunities are few, power on duration is 15%. It is used in the workplace which is not tense and heavy. Such as crane used for installation and maintenance in hydro-power station and power plant.

2.Medium grade: It often works under different loads, with medium speed and not too heavy work. The power on duration is 25%, such as the crane used in general machining workshop and assembly workshop.

3.Heavy grade: Heavy work, often working under heavy load, with a power on duration of 40%, such as cranes used in metallurgical and casting workshops.

4.Extra heavy grade: Often working under rated lifting capacity,the work is very busy, and the power on duration is 60%, such as metallurgical bridge crane.

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