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.

double girder gantry crane

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Differences Between Bridge Crane and Gantry Crane

1. Bridge crane is a kind of lifting equipment which is used to lift materials horizontally over workshop, warehouse and stock yard;

Gantry crane is a kind of deformation of bridge crane, also called gantry crane. It is mainly used for loading and unloading of outdoor goods yard, stock yard and bulk cargo.

2. The shape of the bridge crane is similar to that of the bridge because its two ends are located on the tall concrete column or metal bracket;

The metal structure of the gantry crane is like a portal frame. Two legs are installed under the main beam, which can move directly on the track on the ground. The two ends of the main beam can have an extended cantilever beam.

3. The main beamof the bridge crane runs longitudinally along the track laid on the viaduct on both sides, which can make full use of the space under the bridge to lift materials without being hindered by the ground equipment. It is the most widely used and the largest number of lifting machinery;

Gantry crane has the characteristics of high utilization rate, wide operation range, wide adaptability and strong universality, which is widely used in port freight yard.

4. Difference in appearance

bridge crane and gantry crane
                                                                                       Bridge Crane & Gantry Crane
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Operation and Control of Rail Container Gantry Crane

The rail type container gantry crane is operated by the driver in the control console of the cab. The cab is usually suspended under the traveling trolley and runs with the trolley.

All operations of the crane can be realized on the linkage platform of the cab. The crane can also be operated at the crane operation side to facilitate the temporary displacement of the crane. When the crane is operated at the operation side, the electric interlocking is realized with the main operation linkage platform.

The driving control of rail container gantry crane can adopt different ways according to the needs of users. At present, the commonly used ones include:

(1) conventional AC belt eddy current speed regulating braking system;

(2) AC stator voltage regulating speed regulating system;

(3) thyristor DC constant rate speed regulating system and AC rheological frequency regulating speed system, and different electric driving control systems can be adopted according to different mechanisms.

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Important Information of Our Marine Travel Lift

Marine travel lift is a kind of mobile lifting equipment, also known as boat hoist. It is safe and reliable to lift, with various turning ways, self-contained power, and flexible. It is suitable for the lifting of yacht club, water upstream Park, water training center, navy and other units.

Main features of the travel lift are as follows:

  1. With diesel engine to provide power, the whole vehicle is hydraulically driven; the hydraulic transmission has the advantages of smooth movement, fast reaction, small inertia, high-speed start, braking and reversing; Small size, light weight and compact structure; easy to operate, convenient and automatic; it can realize stepless speed regulation conveniently in operation; easy to realize overload protection.
  2. The lifting mechanism of the travel lift adopts multi-point lifting, which can effectively disperse the force acting on the hull. The distance between lifting points can be adjusted to meet the needs of different hull.
  3. The main beam and the cross beam are hinged to eliminate the local stress caused by poor road conditions.
  4. Use soft and strong lifting belt to evenly lift and pull on the external surface of the vessel, yacht or wooden boat without any damage to its surface.
  5. The ships can be arranged in turn quickly, and the distance between the ships can be very small, saving storage space.
  6. The tire type running mechanism is easy to operate, with functions of oblique travel, Ackerman steering and 360 ° rotation in place, and has 4% climbing capacity when fully loaded.

Our core technology:

  1. Unlimited handling height of yachtor boat;
  2. No damage to the lifting hull;
  3. Tire pure rolling without sliding;
  4. Synchronous lifting ofmultiple lifting points;
  5. Internal force release of gantry on complex pavement;
  6. Flexible steering control;
  7. Feedback control of synchronous detection;
  8. Tire anti-slip Technology.
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Three Types of Bridge Crane Movement Form

Bridge crane is an important tool and equipment to realize mechanization and automation of production process in modern industrial production and lifting transportation. Therefore, the bridge crane is widely used in indoor and outdoor industrial and mining enterprises, iron and steel chemical industry, railway transportation, port and wharf, logistics turnover and other places.

There are three types of movement form of bridge crane:

1.The bridge crane is driven by the crane motor and moves forward and backward longitudinally along the tracks on both sides of the workshop;

2.The trolley and lifting mechanism on the main girder of the crane are driven by the trolley motor to move laterally left and right along the main girder track of the bridge;

3.Lifting motor (main hook and auxiliary hook) drives heavy objects to do vertical lifting movement.

bridge cranes

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