Crane Traveling Mechanism of AQ-HD Overhead Crane

The crane traveling mechanism of AQ-HD European standard overhead crane is mainly composed of motor, reducer and wheel group etc. 

The driving device adopts full sealed F series three in one drive, with self-lubricating and maintenance free design, and the running speed is controlled by frequency conversion, with stable operation, safety and reliability, low noise and low energy consumption.

The motor adopts YEJ series electromagnetic braking three-phase asynchronous motor. It is a fully enclosed, self fan cooling, squirrel cage type additional DC electromagnet brake. A group of DC disc electromagnetic brake is added between the rear end cover and fan of Y series motor. The motor has smooth starting and braking, convenient adjustment of braking torque, high positioning accuracy, high braking sensitivity and strong adaptability for frequent starting and braking.

Working principle: the DC disc brake of YEJ series brake motor is installed at the front end of the rear end cover of the motor. When the brake motor is connected to the power supply, the brake also works at the same time. Due to the electromagnetic attraction, the electromagnet attracts the armature and compresses the spring. The brake, armature and rear cover are separated, and the motor starts to rotate. When the power is cut off, the brake electromagnet loses the electromagnetic attraction, the spring pushes the armature to press the brake disc, and the motor stops running immediately under the action of friction torque.

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F series reducer adopts international advanced technology and is manufactured according to international technical requirements. It saves space, is reliable and durable, has high overload bearing capacity, and its power can reach more than 90kw. It has low energy consumption and superior performance. The reducer efficiency can be as high as 95%, with small vibration, low noise and high energy saving. It adopts high-quality forged steel material, rigid cast iron box body and high-frequency heat treatment on the gear surface After precision machining, the parallelism and positioning accuracy of the shaft are ensured, and the high matching degree integration of the motor reducer is ensured, and the quality characteristics of the product are fully guaranteed.

F series reducer belongs to hard tooth surface reducer. The gears are made of high-quality alloy steel after carburizing and quenching. The hardness of gear tooth surface is 54-62hrc. It has small volume, light weight, high precision, large bearing capacity, high efficiency, long service life, high reliability, stable transmission and low noise. It adopts self-lubricating system and maintenance free design.

The wheel set is made of high strength steel 42CrMo and processed by rough turning, quenching, tempering and finish turning. The hardness of heat treatment is 48-52hrc. It has high strength, good toughness, good harden-ability, high fatigue resistance and impact resistance after modulation treatment.

The crane driving device adopts separate driving and three in one driving device, which is composed of hard tooth surface reducer and brake motor, and adopts frequency conversion speed regulation control. Its driving form has high transmission precision, light weight, good sealing performance, low noise, long service life and maintenance free.

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    Types Of Single Girder Overhead Cranes

    AQ-LD model single girder overhead crane is characterized by more reasonable structure and higher strength steel as a whole. Used together with CD1 model and MD1 model electric hoist as a complete set, it is light duty crane with the capacity of 1-20 tons. The span is 7.5-28.5m, working grade is A3-A4. Working temperature is -25℃-40℃. This type of crane is widely used in plants, warehouse, material stocks to lift goods. It is prohibited to use the equipment in the combustible, explosive or corrosive environment.

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    The single girder crane has two operational methods, ground or operational room which has open model and closed model and can be installed on left or right side according to the practical situation; and the direction of entering the gate has two forms, side-way and ends in order to satisfy the users, choice under different conditions.

    AQ-HD European type single girder crane with light dead weight, small wheel pressure and reliable performance 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. Wear well can lower maintenance and maintenance costs.

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    AQ-LX model single girder suspension crane and CD1 or MD1 type electric hoist are used together as a complete set. It is a light duty track traveling crane with trajectory which applies to and used at machinery assembling sites and warehouses. This kind of crane usually adopts ground controlling and works at a temperature of -20℃ to 40℃. It is prohibited to use the equipment at combustible, explosive or corrosive environment.

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    AQ-LDZ electric single girder grab crane works together with hoist grab trolley, and its lifting capacity is from 2ton to 10ton. The grab crane is used to grab all kinds of loose materials. The lifting capacity include the dead weight of the grab.

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    AQ-LDP model electric single girder overhead crane belongs to very low clearance light duty lifting equipment. Electric hoist is at one side of main girder, which can increase the service space of hook and reduce the cost. With advantages of big trolley tread, smooth traveling, tight structure, strong rigidity, delicate operation, low noise, safety and reliability and beautiful exterior, it is widely used in the situation that the clearance height of workshop is low and the operating ambient temperature is -25℃-40℃.

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    AQ-LDP model single girder crane is designed and produced according to GB/T3811-2008, JB/T1306-2008 standard and used with CD1, MD1 model hoist. It is a light duty crane with rated load of 3-10tons. The span is 7.5-22.5m, working grade is A3-A4, and lifting height is 6-12m. The main operating method is ground control (ground control, remote control, ground control + remote control), if the client has special requirement, we can do non-standard design according to the requirements.

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      Features of European Double Girder Overhead Crane

      The European double girder hook overhead crane is the advanced and mature European hook overhead crane in China. Adopting the design standard and manufacturing process of European crane, it has the characteristics of low height, light self weight, small wheel pressure, flexible direct drive, stepless speed change, maintenance free, etc.

      The steel structure, mechanical system, electrical system and safety protection device of the crane shall conform to the current relevant specifications and standards. The crane has sufficient strength, rigidity, stability and overturning resistance. The operation performance of each mechanism is safe and reliable. The vibration, noise and environmental protection meet the requirements of current relevant standards. The fire protection and safety meet the current relevant standards of China. The European cranes mainly have the following features:

      1. High safety and reliable performance. The main hoisting mechanism adopts a suit structure, the brake system adopts the high-speed shaft working brake, and the control brake multiple braking scheme of the electrical system, with high safety, reliable and stable performance.

      2. The whole machine is low in height, the trolley has a wide range of operation, and the utilization rate of the plant is improved.

      With European structure, reasonable drum diameter, pulley block ratio and reducer support structure, the service surface of hook operation of the machine is significantly larger than that of ordinary overhead crane. Under the same lifting height, the height above the rail surface of the whole crane can be reduced by more than 30% compared with that of ordinary crane, which improves the utilization rate of the plant, saves a lot of civil engineering costs, and makes the technical indexes of the plant in line with the international standards Advanced level.

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      3. The structure is reliable, the weight of the whole machine is light, the load is reasonable, and the foundation load is small.

      The new type of bridge is adopted to improve the rigidity of the bridge. The end beams are hinged with pin shafts through connecting beams, and the two main beams are relatively independent, which is convenient for transportation and field installation. As a result of many technical measures adopted by the machine, the load of each wheel is ensured to be even, the self weight of the whole machine is reduced by more than 15%, and the maximum wheel pressure is reduced by 10% – 20%.

      While ensuring the advanced design of the crane, it is equivalent to the safety performance of the traditional overhead crane, and the safety factor of the important parts of the bridge is higher and more reliable. At the same time, the configuration performance of the purchased parts is better than that of the traditional crane.

      4. High manufacturing precision, fine, beautiful appearance.

      The trolley frame adopts large-scale CNC floor milling and boring machine to process the reaming of each support and trolley as a whole, so as to reduce the manufacturing deviation of the riveting and welding process, with high manufacturing accuracy, improve the installation accuracy of each component, and avoid the occurrence of rail gnawing and three fulcrums of the trolley.

      The bridge adopts the whole line drawing and whole boring process, and the end beam connection reaming and the gantry frame reaming are all used for the whole boring, which improves the assembly accuracy of the bridge and the gantry running mechanism, and avoids the occurrence of the gantry gnawing the rail and the three fulcrum phenomenon.

      5. The electric control precision is high and the protection device is perfect. The bridge crane is controlled by AC frequency conversion speed regulation program, and the action accuracy of each mechanism is less than 5mm. Meanwhile, it is equipped with perfect mechanical and electrical protection devices, such as overload limiter of main hook and auxiliary hook, height limiter of main hook and auxiliary hook, etc.

      6. The products of our company have been modularized and serialized. All new products are developed on the basis of mature products, with reliable product performance.

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        Daily Maintenance of Crane

        Crane belongs to a kind of lifting machinery, which is a kind of machinery for circulation and intermittent movement. A working cycle includes: the taking device lifts the object from the taking place, then moves horizontally to the designated place to lower the object, and then carries out the reverse movement to return the taking device to its original position, so as to carry out the next cycle. Some crane daily maintenance knowledge is provided as below:

        1. Check whether the engine (or starter) has sufficient fuel.

        2. Check whether the water in the water tank is sufficient.

        3. Check whether the oil in the engine (or starter) sump is sufficient.

        4. Check whether the oil in the control box is sufficient.

        5. Check the working condition of the engine for oil leakage, water leakage, air leakage and abnormal knocking sound. Both the low speed and high speed shall operate well.

        6. Check the condition of the wire rope, especially the fastening of the connection.

        7. Check whether the battery, generator, motor, horn and lighting are in good condition.

        8. Check whether the instruments are normal (according to the factory instructions of various machines).

        9. Each part shall be filled with lubricating oil according to the lubricating cycle, lubricating parts and used oil specified in various mechanical lubrication charts.

        10. Check the working conditions of each mechanism, such as the upper rotation and lower travel mechanism of each clutch and brake, boom, pulley, hook, etc. And carry out operation test, if any fault is found, it shall be eliminated in time.

        11. Clean the exterior of the machine.

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          Characteristics of Overhead Crane

          Overhead crane is a kind of lifting equipment which is used to lift materials horizontally over workshop, warehouse and stock yard. Overhead crane is a commonly used crane equipment. It is an important tool and equipment to realize the mechanization and automation of production process in modern industrial production and lifting transportation. 

          The characteristics of the overhead crane are as follows:

          1. The bridge adopts box girder and automatic submerged arc welding;
          2. The trolley adopts a new conductive device of I-steel track cable, which is safe and reliable;
          3. The hoisting mechanism can be equipped with a second set of safety device according to the requirements to increase the reliability;
          4. Standardization, serialization and generalization of parts and components;
          5. The vision of the control room is wide, all mechanisms are operated in the control room, comfortable and flexible;
          6. The whole height of the crane is low, which can improve the utilization rate of workshop, and the crane hook has a wide range of operation;
          7. The overhead crane has reliable structure, light self weight, reasonable bearing, small foundation bearing, low failure rate and small daily maintenance workload;
          8. The overhead crane has high configuration, advanced and reliable electrical control, and excellent system performance.

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            Safety Device of Overhead Crane

            In order to ensure the normal use of the overhead crane, put an end to the accidents that may occur in the lifting operation of the hook overhead crane, and ensure the life safety of the operators, the overhead crane, as the lifting equipment for material lifting over the workshop, warehouse and stock yard, is equipped with a variety of safety protection devices. Common protective devices include lifting limiter, limiter, buffer, anti-collision device, anti deflection and deflection indication device, anti overturning, anti wind damage and other safety protection devices.

            1. Lifting capacity limiter

            Overload operation is an important cause of frequent accidents of overhead crane, which can be prevented by overload protection device.

            2. Limiter

            There are two types of limiters, one is the up limit position limiter and the down limit position limiter to protect the safe operation of the hoisting mechanism, the other is the limit position limiter to limit the operation of the operating mechanism.

            3. Buffer

            Absorb the operation function of the trolley to reduce the impact.

            4. Anti-collision device

            The running speed of modern overhead crane is constantly increasing. There are several machines running on the same track at the same time. In order to prevent the collision between the cranes, the anti-collision device is installed on the crane.

            5. Anti deflection device

            Due to the deviation of wheel manufacturing and installation, and the deviation of transmission mechanism, the operation of the bridge crane is often skewed, and even the “rail gnawing phenomenon” will occur in serious cases, which will even affect the metal structure and operation mechanism, and the anti deflection device is necessary for the overhead crane.

            6. Other safety device

            The electrical equipment on the bridge shall be equipped with rain cover;

            The single girder overhead crane is equipped with anti overturning safety hook to ensure that the trolley does not overturn and the maintenance work is safe.

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              Lifting Mechanism of Overhead Crane

              Lifting mechanism of overhead crane refers to the mechanism used to lift or lower the goods, which is generally winch type. The lifting mechanism is the most important and basic mechanism for the crane. Its working quality directly affects the working performance of the whole crane.

              The hoisting mechanism is generally composed of driving device, wire rope winding system, taking device and safety protection device. The driving device consists of motor, reducer, brake, drum group, coupling and other components. The wire rope winding system consists of wire rope, drum group, pulley group and hook group. There are hook, ring, grab, electromagnetic chuck, sling and hanging beam. Safety protection devices include overload limiter, lifting height limiter, over-speed protection switch and safety brake, etc.

              Working principle of lifting mechanism: after the motor is powered on, it turns, through the reducer to change speed, then through the coupling to drive the drum, through the wire rope winding system to complete the lifting and lowering process of the hook.

              The lifting mechanism of the crane adopts the series resistance speed regulating system, the starting and braking are stable, the impact is small, and the hook positioning is accurate, which not only improves the production efficiency, but also greatly extends the service life of various parts of the lifting mechanism.

              The brake of lifting mechanism adopts the scheme of supporting brake and controlling brake. Electric braking is adopted for control braking, and brake is set on the high-speed shaft of motor for supporting braking, so as to make the brake of hoisting mechanism stable, safe and reliable.

              All parts of the lifting mechanism are arranged compactly, maintained conveniently and ensured to be safe and reliable.

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                Overhead Cranes for Metallurgy Use

                Metallurgical overhead crane can take part in specific process operation in the process of steel production. Its basic structure is similar to the ordinary overhead crane, but it is also equipped with special working mechanism or device. This crane is characterized by frequent use, poor conditions and high working level.

                Ladle/casting overhead crane

                Casting overhead crane is used for lifting molten iron into mixer, steel-making furnace and continuous ingot casting equipment or ingot mould. The main trolley is used to lift the bucket, and the auxiliary trolley is used to turn the bucket.

                Socking pit crane/clamp crane

                This kind of crane uses the clamp to lift the high temperature ingot vertically to the soaking pit or take it out and put it on the ingot carrier.

                Stripper crane

                Stripper crae is used to force the ingot out of the ingot mould. There is a special de ingot device on the trolley, and the de ingot method depends on the shape of the ingot mold: some de ingot cranes press the ingot with the top bar, and lift the ingot mold with the tongs; some press the ingot mold with the tongs, and lift the ingot with the tongs.

                Charging crane

                Charging crane is used to add charge to open hearth furnace. The lower end of the column of the main trolley is equipped with a pick-up bar to move the material box and send it into the furnace. The main column can rotate around the vertical axis, and the cantilever can swing up and down and rotate. Auxiliary trolley is used for furnace repair and other auxiliary operations.

                Forging crane

                Forging crane is used for forging large work pieces with hydraulic press. A special tripper is hung on the hook of the main trolley to support and turn the workpiece; the auxiliary trolley is used to lift the workpiece.

                metallurgical overhead cranes
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                  Basic Information on Bridge Crane

                  Bridge crane is a kind of lifting equipment which is used to lift materials horizontally over workshop, warehouse and stock yard. Because its two ends are located on tall concrete columns or metal brackets, the shape is like a bridge. The beam of 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 lifting equipment.

                  Bridge crane is generally composed of bridge (also known as crane), lifting mechanism, trolley, crane moving mechanism, control room, trolley conductive device (auxiliary slide line), crane main power conductive device (main slide line), etc.

                  ld single girder overhead crane
                  LD single girder bridge crane

                  The hoisting mechanism is composed of hoisting motor, reducer, drum, brake, etc. The lifting motor is connected with the reducer through the coupling, brake wheel, and the output shaft of the reducer is connected with the winding drum of the steel wire rope. The other end of the steel wire rope is equipped with a hook. When the drum rotates, the hook rises or falls with the winding or releasing of the steel wire rope on the drum.

                  The heavy objects on the hook moves up and down with the rotation of the drum; the trolley moves left and right in the width direction of the workshop, and moves forward and backward with the cart in the length direction of the workshop. In this way, it can realize the movement of heavy objects in the perpendicular, horizontal and vertical directions, move the heavy objects to any position in the workshop, and complete the lifting and transportation task.

                  QD double girder overhead crane
                  QD double girder bridge crane

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                    Safe Control and Protection of Overhead Crane

                    1. The heavy objects shall be able to move along the up, down, left, right, front and back directions, and can move simultaneously in the three-dimensional direction. Except for downward movement, the terminals in the other five directions shall be provided with terminal protection;

                    2.There should be reliable braking device, even in the case of power failure, the weight will not fall due to dead weight;

                    3.There should be a large speed regulation range. When moving from static state, it should accelerate gradually from the lowest speed, and the acceleration should not be too large;

                    4.In order to prevent the possible danger of overload or overspeed, there should be short-time overload protection measures. Generally, over-current relay is used as overload protection of circuit;

                    5.There should be no-voltage protection;

                    6.There should be safety protection measures.

                    Notes and Attentions While Operating Crane

                    1.Each crane must be labeled with the rated lifting capacity at an obvious place;

                    2.During work, no one is allowed to transport people on the crane or with the hook;

                    3.Do not drive the crane without operating license or after drinking;

                    4.During operation, it is necessary to concentrate, not talk, smoke or do irrelevant things;

                    5.The crane shall be clean; equipment, tools, in-flammables, explosives and dangerous goods shall not be placed around;

                    6.Crane is not allowed to be used under overload;

                    7.When the crane is running on the line without obstacles, the hook or sling and the bottom surface of the crane must be more than 2m from the ground;

                    8.If the obstacle is crossed, it must be 0.5m higher than the obstacle;

                    9.For bridge crane with main and auxiliary hooks, do not raise or lower the main and auxiliary hooks at the same time (special exception);

                    10.Inspection or maintenance can only be carried out after power failure and when the sign of power failure operation is hung on the switch. If live working is necessary, safety measures shall be taken for protection and special personnel shall be assigned to take care of it;

                    11.Limit switch and interlock protection device shall be checked frequently;

                    12.When there is a problem with the lifting brake, it is not allowed to lift heavy objects;

                    13.The hoisted objects are not allowed to run over people or equipment;

                    14.When welding a part of the crane, the ground wire shall be specially set, and the machine body is not allowed to be used as the ground wire;

                    15.When the hook is at the lower limit position, there must be more than two circles of safety rope on the drum;

                    16.Cranes are not allowed to collide with each other, and it is not allowed to use one crane to push another crane to work;

                    17.When lifting heavy objects, liquid metals, explosives and dangerous goods, it is necessary to slowly lift them 100-200mm from the ground to test the reliability of the brake;

                    18.All electrical equipment casings of bridge crane shall be grounded;

                    19.Safety technical inspection shall be carried out regularly, and pre inspection and pre repair work shall be done well.
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