Advantages and Features of Cranes

The single girder overhead crane is designed and produced according to national standards, the crane is a kind of light duty lifting equipment, it is equipped with CD/MD electric wire rope hoist or electric chain hoist as its lifting mechanism. The single girder crane is widely used in workshop, warehouse, factory and yard to lift or move heavy materials, which can greatly facilitate the materials handling work.

The double girder overhead crane with the hook is mainly used in the workshops. According to the utilization class and loan condition, the work duty can be from A4 to A7. The entrance of the cabin has three ways from side entrance, end entrance and top entrance, and the cabin can be fixed on the left or right side. The crane power supply can adopt safety bus bar or angle steel that can be fixed on the same or opposite side with the cabin. All the work operations can be finished in the cabin, if required, the remote controller can be added.

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Advantages and Features of European Standard Overhead Cranes

AQ-HD European type single girder overhead crane has light dead weight, small wheel pressure and reliable performance, and it is easy to operate. Small wheel pressure and margin can cut down earlier stage project investment of workshop, low noise, low energy consumption, energy conservation and environmental protection. The crane has reliable quality, which can lower maintenance costs.

The European double girder overhead crane is the latest version of overhead crane, designed with FEM standards, developed on the base of traditional crane, therefore, European double girder crane has unbeatable advantages, such as unparalleled performance, tight structure, light dead weight, high safety and reliability, high perform efficiency, and wide applications in various industries.

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Advantages and Features of Single Girder Gantry Crane

  1. Emergency switch can stop all movement when any dangerous thing or risk happens.
  2. Smooth starting and stopping, overload protection.
  3. Convenient maintenance,electricity saving.
  4. Protective earthing, main lifting motor with thermal protection.
  5. Sub-assemblies characteristics are tested before assembly.
  6. All cranes must be pre-assembled and tested before leaving factory and offer the certification of test.

For Double Girder Gantry Crane:

  1. Advanced technology, delicate design, attractive appearance.
  2. Novel structure, high crane stability and reliability.
  3. Large loading capacity and high working efficiency.
  4. Flexible operation and easy maintenance.

double girder gantry crane 32ton

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Trial Operation of Crane

Before the operation of the crane, it is necessary to carefully check whether the installation of mechanical and electrical components meets the requirements, whether the connection of parts and components is loose, whether the lubrication parts are lubricated and whether the lubrication is good. Otherwise, it should be eliminated. It is necessary to check whether the positive and reverse directions of the motor meet the requirements, especially the rotation directions of the two motors of the crane operating mechanism must be consistent.

When it is confirmed that the crane is in complete normal condition, the test run can be carried out. At that time, the end beam railing door and platform should be closed, the control handle should be in zero position, then close the emergency switch, and then press the start button to connect the circuit, and the crane will enter the ready state for operation.

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The test run of the crane is divided into the following three steps:

1. No Load Test Run of Crane

No load test run shall be carried out according to the following procedures and requirements:

(1) Turn the brake wheel of each mechanism by hand so that the last shaft (such as wheel axle) can not be stuck when rotating for one cycle.

(2) Trolley travel: the empty trolley travels back and forth along the track for three times. At this time, the wheels should not slip obviously. The driving wheels shall be in contact over the full length of the track. Starting and braking shall be normal and reliable. The action of limit switch is accurate. The collision position between the buffer on the trolley and the collision head on the bridge is accurate.

(3) Lifting and lowering of empty hook: start the lifting machinery to make the empty hook rise and fall three times. At this time, the action of limit switch of lifting mechanism shall be accurate and reliable.

(4) Drive the trolley to the middle of the span, and the crane runs along the full length of the workshop twice to verify the frame and track, and then travel three times at the rated speed to check the working quality of the traveling mechanism. At this time, when starting or braking, the wheels should not slip, the travel is stable, the action of the limit switch is accurate, and the buffer works normally.

2. Static Load Test Run of Crane

The static load test run shall be carried out according to the following procedures and requirements:

(1) Drive the trolley to the end limit position, and mark the zero position of the middle point of the main beam after the standby is stable.

(2) Drive the trolley to the middle of the main beam, lift it steadily, and gradually load it to the rated lifting capacity, which is 100 mm above the ground and suspended for 10 minutes. Then measure the lower deflection of the middle part of the main beam. At this time, the lower deflection of the middle part shall not exceed 1 / 800 of the span length L. after three times of such tests, there shall be no residual deformation after the unloading of the third test, and the interval time of each test shall not be less than 10 minutes.

(3) After the above tests are met, the test run of 25% over rated load (i.e. 1.25 times of lifting capacity) shall be conducted. The method and requirements are the same as above.

(4) After the above test, all parts of the crane shall be checked to ensure that there is no crack or connection

The connection is loose or damaged.

In order to reduce the influence of elastic deformation of crane beam on the test record, the crane should be driven near the column of workshop during static load test.

3. Dynamic Load Test Run of Crane

The dynamic test run shall be carried out according to the following procedures and requirements:

(1) Let the crane lift the rated lifting capacity test first. During the test, the two mechanisms should be started at the same time. According to the cycle time specified by the working type of the crane, repeated actions such as start, stop, forward rotation and reverse rotation shall be carried out, and the time shall not be less than 1 hour. At this time, the brake, limit switch and electrical control of each mechanism shall be accurate and reliable, the wheel shall not slide, the vibration of bridge shall be normal, the mechanism shall operate stably, all parts and components shall be free of crack and damage after unloading, and the joints shall not be loose.

(2) When the above test results are good, the test run with the same contents as the above methods and requirements can be carried out under the condition of 10% overload.

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Description of Single Girder Overhead Crane Characteristics

AQ-LD single girder crane

AQ-LD type single girder overhead crane: The structure of this overhead crane is simple and the purchase cost is relatively low. It must be used together with the electric hoists. Generally, the lifting capacity is 0.5 ~ 20t, the span is 7.5 ~ 31.5m, the working level is A3, and the working environment temperature is – 20°C ~ 40°C. It is widely used in factories, warehouses, machining workshops, maintenance workshops and other places. Its operation modes include ground wired handle, ground wireless remote control, cab operation and the combination of two operation modes. Because of its low working level, it can not be used in places with large lifting capacity and frequent work.

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AQ-LDY single girder crane: The crane is mainly used to lift molten metal in metallurgy and casting places, with simple structure and low purchase cost. The supporting lifting mechanism is YH type metallurgical electric hoist. Generally, the lifting capacity is ≤ 10 tons, the span is 7.5 ~ 31.5m, the working level is A6, and the working environment temperature is – 20°C ~ 60°C. The operation mode is mainly cab operation and ground wireless remote control.

AQ-LX single girder suspension crane: The underhung crane is used together with electric hoist, with simple structure and low cost. The top of the plant must be equipped with a running track. Generally, the lifting capacity is 0.5-10 tons, the span is 7.5-16 m, the working level is A3, and the working environment temperature is – 20°C-40°C. Mainly used in machining, assembly and warehouse. The operation mode includes ground wired handle and ground wireless remote control.

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AQ-LDP electric single girder crane: This type of crane belongs to low clearance single girder crane. The electric hoist is located on one side of the main beam, increasing the lifting height of the hook. Generally, the lifting capacity is 1-16T, the span is 7.5-22.5m, the working level is A3, and the working environment temperature is – 20°C-40°C. The operation mode includes ground wired handle and ground wireless remote control.

AQ-HD European single girder crane adopts European technology, modular design, mainly equipped with European steel wire rope hoist, which has light weight, light structure, beautiful appearance, and 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 1-10 tons, the span is 7.5-22.5 m, 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 and ground wireless remote control.

AQ-HD5T single girder crane

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Performance of Steel Structure Workshop

1. Seismic resistance

The roofs of low-rise buildings are mostly sloped roofs. Therefore, the roof structure is basically a triangular roof truss system made of cold-formed steel members. After sealing structural plates and gypsum boards, light steel members form a very solid “plate rib structure system”. This structure system has a stronger ability of anti-seismic and horizontal load resistance, which is suitable for those with an anti-seismic intensity of more than 8 degrees Area.

2. Wind resistance

The steel structure has the advantages of light weight, high strength, good overall rigidity and strong deformation ability. The self weight of the building is only one fifth of that of the brick concrete structure, which can resist the hurricane of 70 meters per second, so that life and property can be effectively protected.

3. Durability

The residential structure of light steel structure is composed of cold-formed thin-walled steel member system, and the steel bone is made of super anti-corrosive high-strength cold-rolled galvanized steel plate, which effectively avoids the influence of steel plate corrosion in the process of construction and use, and increases the service life of light steel members. The structural life can be up to 100 years.

4. Thermal insulation

The heat preservation and insulation materials used are mainly glass fiber cotton, which has good heat preservation and insulation effect. The insulation board used for the external wall can effectively avoid the phenomenon of “cold bridge” of the wall and achieve better insulation effect. The thermal resistance of R15 insulation cotton with the thickness of about 100mm can be equivalent to the brick wall with the thickness of 1m.

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5. Soundproof

The sound insulation effect is an important index to evaluate the residence. The windows installed in the light steel system are all made of hollow glass, which has good sound insulation effect, with the sound insulation reaching more than 40 decibels. The wall composed of light steel keel and thermal insulation material gypsum board has a sound insulation effect of up to 60 decibels.

6. Health

Dry operation construction can reduce the environmental pollution caused by waste. The steel structure materials of houses can be 100% recycled, and most of other supporting materials can also be recycled, meeting the current environmental awareness; all materials are green building materials, meeting the requirements of ecological environment, and conducive to health.

7. Comfort

The light steel wall adopts an efficient energy-saving system with breathing function, which can adjust the dry humidity of indoor air; the roof has ventilation function, which can form a flowing air room over the roof, and ensure the ventilation and heat dissipation requirements of the roof.

8. Quick

All dry operation construction, not affected by the environmental season. For a building with an area of 300 square meters, it takes only 5 workers 30 working days to complete the whole process from foundation to decoration.

9. Environment protection

The material can be 100% recycled, truly green and pollution-free.

10. Energy conservation

All adopt high efficiency energy-saving walls, with good heat preservation, heat insulation and sound insulation effect, which can reach 50% energy-saving standard.

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Routine Maintenance of Overhead Crane

  1. Appearance of overheadcrane: fully clean the appearance to ensure no dust. Check for cracks and open welds.
  2. Crane and trolley: check and fasten whether the transmission shaft seat, gearbox, coupling, shaft and key are loose; check and adjust the brake wheel clearance to make it uniform, sensitive and reliable.
  3. Check the reducer of overhead crane mainly to see if it leaks oil. If there is abnormal noise in the box during operation, open the box cover for inspection. Generally, it is caused by bearing damage or excessive backlash of gear mesh, serious wear of tooth surface, etc.
  4. Lifting and hoisting: check whether the steel wire rope, hook and pulley are safe and reliable, and replace if the abrasion exceeds the specified value; check and adjust the brake to make it safe, sensitive and reliable.
  5. Inspection of steel wire rope of overhead The commonly used varieties are phosphatized coating steel wire rope, galvanized steel wire rope and smooth steel wire rope. The inspection of steel wire rope should focus on the observation of broken wire, wear, kink, rust and other conditions. For some positions with serious wear and broken wire but not exceeding the standard, marks should be made so as to focus on tracking and rechecking. Pay attention to check whether the safety limiter of steel wire rope in the drum is effective, whether the steel wire rope pressing plate on the drum is compressed and whether the number of pressing plates is appropriate.
  6. Lubrication: check the oil quality and quantity of all parts, and add or replace the lubricating oil as required.
  7. Inspection of overheadcrane pulley. The key points are whether the wear at the bottom of the groove exceeds the standard and whether the cast iron pulley has cracks. For the balance wheel of the pulley block of the pitching mechanism, it is easy to be ignored because it does not act normally. Therefore, before installation, it is necessary to check the flexibility of its rotation, otherwise, the length and tension of the left and right wire ropes in the installation cannot be automatically adjusted by the balance wheel, which increases the difficulty of adjusting the rope in the high altitude and the degree of operation risk.
  8. Electrical: check whether the limit switches are sensitive and reliable; check whether the electrical appliances in the electrical box are sensitive and reliable; check whether the motor, bell and wire are safe and reliable; check whether the signal lamp is in good condition.
  9. Check whether the coupling of overhead crane is loose or even “rolling key”. It is important to check whether the elastic rubber ring of the elastic pin coupling has abnormal wear, and pay special attention to the wear condition of the gear ring of the gear coupling. Due to the poor installation accuracy, when there is a large deviation between the two shafts, the whole ring gear will soon wear out in a short time. In case of such a situation in the hoisting mechanism, serious accidents are likely to occur.
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Protective Device of Electric Hoist

Electric hoist generally has multi-directional protection device to ensure the safety of personnel and work, but the protection device should also have some basic requirements.

  1. It has the function of preventing danger, suitable for the operation condition of electric hoist, and does not hinder the production and operation.
  2. It is installed firmly, with reliable performance, sufficient strength and rigidity, accurate action and stable performance.
  3. It is durable and does not affect the adjustment, repair, lubrication and inspection of the hoist.
  4. The protective device itself shall not cause harm to the operator.

Inspection before Using Electric Hoist

Before using the electric hoist, a simple safety inspection is necessary to avoid the abnormal problems of some parts and do a good job of hazard prevention in advance.

  1. The button control direction of the operating handle, the brake and the limiter are sensitive and accurate.
  2. The steel wire rope is free of defects, well lubricated and arranged in order.
  3. There is no abnormal sound when the motor and reducer rotate.
  4. There are no obstacles in the track of electric hoist and the walking area of personnel.
  5. The hook and pulley can rotate flexibly.

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Precautions for Installation of Electric Hoist

Electric hoist installation is a very important work, not only to do a good job of preparation before installation, but also pay attention to the specific installation matters.

  1. In order to ensure that the electric hoist does not derail when running to both ends of the track or to prevent collision and damage to the body, elastic buffers shall be set at both ends of the track.
  2. When installing the electric hoist, check whether the plug block used to fix the wire rope is loose.
  3. Ground wire shall be set on the track or its connected frame. The ground wire can be φ 4 – φ 5mm bare copper wire or metal wire with a cross section of not less than 25mm ².
  4. The ground resistance of all power circuits and control circuits of electrical devices shall not be less than 10000 Ω per volt working voltage.

Overall Inspection of Electric Hoist after Installation

After the installation of electric hoist, a comprehensive safety inspection is required, which is very necessary from the perspective of safety:

  1. Whether the electrical equipment of the electric hoist is suitable for the current type and working voltage of the installation site.
  2. Whether the electrical circuit is connected correctly and reliably.
  3. Check whether the action of limit device is correct, flexible and reliable.
  4. Whether all lubricating parts are fully lubricated.
  5. Whether the wheel is reliably connected with the track.
  6. When selecting the power supply cable, it must be ensured that the power supply voltage at the incoming terminal of the hoist motor is not lower than the rated voltage.

Points for Attention

  1. The operators must receive professional study and safety technical training, be examined and approved by the state or the competent business department, and obtain the operation certificate of special operators issued by the local competent department before conducting and operating. It is strictly prohibited to operate without the certificate.
  2. Before using the electric hoist, check the safety and technical conditions of the hook, wire rope, reducer and other vulnerable parts.
  3. When the electric hoist is used, it is forbidden to enter the hoisting dangerous area and assign special personnel to watch it.
  4. The electric hoist must be placed or bundled in accordance with the requirements of hoisting regulations.
  5. Lifting operation is prohibited in case of failure of brake and safety device, damage of locking device of hook nut, damage of steel wire rope, etc.
  6. The lifting operation shall not be carried out when the lifting object is bound, hanging is not firm or unbalanced and sliding is possible, and the edge angle of the lifting object is not padded with the steel wire rope.
  7. Lifting operation is not allowed when the site, lifting objects and command signals cannot be seen clearly.
  8. When stopping work or resting, the crane, basket, sling and cable shall be suspended in the air.
  9. When the crane works, it is not allowed to inspect and repair the crane. Do not adjust the brake of lifting mechanism with load.
  10. It is strictly forbidden to fall (slide) freely when lowering the lifting objects. Do not use the limit position limiter to stop.
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Safety Technical Operation for Lifting Personnel

  1. Operators must take part in learning and training, and they can work only after passing the examination and having the work license of special operators issued by the construction industry management department。
  2. Before operation, check the wire rope, clutch, brake, safety ratchet, transmission wheel, etc. During the operation, the steel wire rope shall be kept on the drum for at least three turns. During the operation, no one is allowed to cross the wire rope of the winch, and the wire rope is not allowed to drag along.
  3. During operation, it is strictly forbidden to leave the work post without permission and others are not allowed to start the machine without permission.
  4. During the work, the signal of the commander shall be obeyed. When the signal is unclear or may cause an accident, the operation shall be stopped and the operation can be continued only after the situation is clarified.
  5. In case of sudden power failure during operation, the switch shall be opened immediately and the transported materials shall be put down.
  6. Hoisting command shall be conducted by skilled personnel who master the performance of hoisting machinery, and the signal shall be accurate and the sound shall be loud and clear.
  7. The speed of lifting objects shall be uniform. It is forbidden to brake and change direction suddenly. The translation shall be 0.5m higher than the obstacles. The falling shall be lowered at low speed to prevent dumping.
  8. All personnel are forbidden to stay or walk under the boom and the lifted heavy objects. Objects must be kept at a safe distance from overhead power lines.
  9. Operators shall take part in safety knowledge training, and can only work with certificates after passing the examination.
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AQ-LDY Metallurgical Overhead Crane

LDY metallurgical crane

AQ-LDY type metallurgical single girder crane is designed and manufactured in accordance with JB / T 1306-2008 standard and used together with AQ-YH Ⅱ electric hoist. The working level is A6, the working environment temperature is ≤ 60 ℃, the relative humidity is ≤ 85%, the altitude is below 2000m, and the crane noise is not more than 85dB. It is an important tool and equipment for modern industrial enterprises to improve labor productivity in metallurgy and casting places.

Components of Metallurgical Overhead Crane

Metallurgical electric single girder crane mainly consists of three parts: bridge, metallurgical electric hoist and electrical system. The bridge is used to support and move the load longitudinally. It is composed of metal structure and running mechanism. The metal structure consists of three parts: the main beam, the end beam and the connection of the main end beam. The running mechanism consists of four parts: the driving device, the gearing device, the braking device and the wheel set. The metallurgical hoist bears the lifting and lateral moving loads. The electrical system consists of main circuit and control circuit. The main beam is made of U-shaped channel steel and I-shaped steel by cold bending and pressing or box girder by steel plate. The end beam is made of U-shaped channel steel and box girder by assembly and welding. The main end beam is connected by bolt and shear flange or seat structure, which is convenient for installation and transportation. The operating mechanism is driven separately, and the driving and braking are completed by the tapered rotor motor.

The hoisting mechanism is installed with two independent braking devices – brake and safety brake (double braking) and metallurgical electric hoist with overload limiter. Tapered rotor motor with large starting torque is used for lifting operation motor, with class H insulation, high temperature resistant cable, and thermal insulation protection measures are adopted outside electrical equipment such as motor. The operation mode is ground handle operation or wireless remote control operation.

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AQ-YH Ⅱ Metallurgical Wire Rope Electric Hoist

The metallurgical electric hoist is suitable for the environment with an ambient temperature of – 25 ℃ – 60 ℃, humidity of ≤ 85%, no fire, toxic, explosive and corrosive media. It has a working level of M6, a lifting capacity of ≤ 10t, a lifting height of ≤ 20m, multiple protection functions such as double brake, double limit and heat insulation layer. It is designed and manufactured in accordance with JB / T 9008.1-2004.

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The motor adopts YZD series tapered rotor three-phase asynchronous motor, with protection grade of IP54 and insulation grade of H. The electric hoist is equipped with high-temperature heat insulation protection function to effectively avoid thermal radiation. The steel wire rope adopts steel core steel wire rope (IWR), which has high-temperature resistance characteristics. The cable adopts high temperature resistant cable, and the hook is forged by steel die. The safety protection includes short circuit protection, voltage loss protection, double limit protection, electrical interlock protection, overspeed protection, overload protection, safety braking protection, etc.

The main mechanical structure composition of AQ-YH Ⅱhoist is the same as that of CD1 / MD1 electric hoist, and the lifting and running speed are the same as that of ordinary hoists. YH Ⅱ metallurgical hoist is suitable for places with high environmental temperature such as metallurgy and casting. It is easy to install, use and maintain, and its parts have strong universality.

If you need cranes or hoists, just contact us and we promise you will get the suitable and reliable solution to meet all your work requirements.

European Electric Hoist

ND series wire rope electric hoist is developed according to the European FEM design standard, with advanced concept and beautiful appearance. The driving unit adopts the ABM driving device with point line meshing gear structure imported from Germany. The whole machine is compact and reasonable in structure, simple and convenient in operation, safe and efficient in operation, and has the characteristics of low noise, energy saving and environmental protection. This series of products are designed to operate with frequency conversion and speed regulation, with small impact, which can realize accurate positioning; and can be equipped with intelligent safe operation monitoring recorder, which can continuously record the working state information of crane and prevent the illegal operation and safety accidents of crane. The whole machine adopts maintenance free design, with less vulnerable parts and convenient maintenance.

ND type European electric hoist is a kind of light and small lifting equipment, which can be installed on I-beam or H-beam steel to complete the work independently, and can also be used with European single girder bridge crane, European double girder bridge crane and European gantry crane.

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The hoisting speed of Nd type European electric hoist is double speed or frequency conversion, and its positioning is fast and accurate. The shell adopts aluminum structure, which reduces its weight to the maximum extent. The internal gears of the motor are processed by grinding teeth, and the hardness reaches above HRC60, and the precision reaches grade 7. The hoisting mechanism adopts the internationally advanced C-type structure, that is, the drum device is arranged in parallel with the motor through the reducer, with the limit size Small, compact structure, high space utilization rate; 1 / 4 wire rope winding form, German DIN standard high-strength hook, compact structure, high safety, small swing amount; modular design, reasonable stress structure, good stability, easy and simple maintenance.

Some control appliances are imported Schneider with reliable performance, high sensitivity and long service life; horizontal guide wheel and reverse roller device are designed to ensure the stability and safety of the whole machine during operation; a device for overload limitation and operation state recording of the crane is equipped, which can automatically record the power off and transmission status, lifting operation times and duration of the crane It can automatically judge and record the power failure, overload and over-current failure of lifting motor, continuously monitor the lifting load, judge and record the overload and overload events, and send out alarm signal in case of failure, cut off the lifting power in case of overload, and ensure the safety of personnel and equipment. The recorder adopts nonvolatile data storage technology, and the recorded data can be saved for a long time, and the recorded data can be recorded It can be read out and analyzed by computer, so that users can find and deal with the potential danger in time, and ensure the safe use of the crane. The safety devices include overload limiter, loss of pressure protection, wrong phase protection, precision limiter, use recorder, fault alarm, etc., so that the product has higher safety and reliability, and can implement effective operation state monitoring, Maintenance information display, effectively reduce and eliminate accidents.

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Safety Requirements of Operating Double Girder Gantry Crane

In the lifting industry, different crane equipment have different working characteristics, so they are suitable for different working environment. The double girder gantry crane can carry some large-scale heavy objects and solve many problems that cannot be solved by manpower and other lifting equipment. There are some safety requirements of double girder gantry crane in operation as follows:

  1. When using double beam gantry crane to lift goods, it is not allowed to lift the goods obliquely;
  2. Double girdergantry crane is not allowed to lift and land people with the goods;
  3. Non operators are not allowed to operate the double girder cranes;
  4. The double girder gantry cranes shall be operated by specially assigned person. The operator shall have professional training, be familiar with the operation method, structural characteristics and safety operation precautions of the gantry crane, and shall pass the examination and issue a certificate of qualification before operation;
  5. During the operation of double beam gantry crane, it is forbidden to pass through the head topof people;
  6. During maintenance, power shall be cut off and maintenance sign shall be hung to prevent major accidents during operation in case of failure;
  7. Do not place heavy objects in the air for a long time during the operation of double beam gantry crane.

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