Causes of rocking of double beam crane

1, such as gear coupling gear and reducer gear and its binding key loose, transmission shaft connecting bolt and hole clearance wear big, easy to produce wear clearance.

2. The wheel binding key is loose.

3. A wheel doesn't turn well. Because the plate fixing the wheel bearing seat is not correct so that the bearing clamping is not flexible, the wheel stops first when it stops.

4. The parameters of the two motors are not compatible with each other in the double-beam drive respectively, resulting in non-synchronization.

5, two brake tightness difference is too large.

Electric hoist common failure and treatment

Electric hoist is widely used in the process of electric power production, mainly used for equipment maintenance, lifting, material transportation and so on. In the process of use, the number of electric hoist failure is also increasing, which not only affects the normal production, serious will cause major accidents, how to avoid accidents, the operation of electric hoist, timely handling of various failures in the operation, has become an important part of the production. The following combined with maintenance experience, the causes of some common failures of electric hoist are analyzed in detail. 1. The electric hoist does not work after pressing the starting switch

Mainly because the electric hoist is not connected to the rated working voltage, and can not work, there are generally 3 situations: (1) the power supply system is electric hoist power supply, generally use the test pen test, such as no power, such as power after the work;

(2) electric hoist main, control circuit electrical damage, line disconnection or poor contact, will also make electric hoist motor can not power, in this case, need to overhaul the main, control circuit, maintenance, in order to ** main, control circuit to three-phase motor power supply phase and burn the motor, or electric hoist motor suddenly have electric operation, harm, to disconnect electric hoist motor from the power line, Only to the main and control loop power, and then click the start and stop switch, check and analysis of the control electrical and line work, the electrical or line to carry out or replace the problem, when the confirmation of the main and control loop fault, can be retest; (3) electric hoist motor terminal voltage is more than 10% lower than rated power, motor starting torque is too small, so that electric hoist lifting immovable goods, and can not work, check, with a multimeter or voltmeter to measure the motor input terminal voltage, because the voltage is too low, so that the motor can not start, need to wait for the system voltage to return to normal after the use of electric hoist. Sometimes, the electric hoist motor voltage is normal, and the electric hoist is not working, this needs to consider other reasons, such as: the motor is burned, maintenance needs to replace the motor; The electric hoist is not used for a long time, poor maintenance and other reasons make the brake wheel and the end cover rust dead, the brake wheel can not be opened when starting, the motor only makes a "hum" sound, can not turn up, the electric hoist can not work. At this time, the brake wheel should be removed, the rusty surface should be cleaned, and then the test run again; Serious sweep of the motor will also make the motor do not rotate, found this situation, should stop using, overhaul or replace the motor, with the electric hoist working normally. In addition, the use of electric hoist is strictly prohibited in the production, when the goods are excessively loaded, the electric hoist does not move the goods, the motor only makes a "hum" sound, and does not run, will burn the motor seriously, even cause an accident, then should immediately stop, reduce the goods, so that the electric hoist in rated power work.

2. Abnormal sound occurs when the electric hoist is running

Many failures of electric hoist, such as control appliances, motor or reducer failures, are often accompanied by abnormal noise, the position and height of the noise and sound with different reasons for the fault are different, maintenance, to listen to more look, can use or according to the characteristics of the fault sound, determine the sound location, find and repair the fault.



(1) Abnormal noise occurs in the control circuit and emits "hum" noise. Generally, the contactor has a fault (such as poor contact of AC contactor, inconsistent voltage level, magnetic core is stuck, etc.). The fault contactor should be repaired and replaced when unable to be repaired. (2) If the motor makes abnormal noise, it should stop immediately and check whether the motor is running single-phase, or whether the bearing is damaged, the shaft of the coupling is not correct, and the fault of "sweeping" will make the motor have abnormal sound. The sound location, level and sound of different faults are different. When single-phase running, the whole motor sends out regular strong and weak "buzz" sound; When the bearing is damaged, it will emit a "buzz" sound accompanied by "stomp-stomp" near the bearing; When the coupling axis is not right, or the motor is slightly swept, the whole motor issued a "buzz" sound, and from time to time accompanied by a sharp and harsh sound. In short, according to the difference in noise, find out the fault, carry out item by item overhaul, restore the normal performance of the motor, when the motor fault is not processed, prohibit the use of electric hoist.

(3) Abnormal noise from the reducer, reducer failure (such as gearbox or bearing lack of lubricating oil, gear wear or damage, bearing damage, etc.), at this time should be stopped for inspection, first determine whether the reducer gearbox or bearing in use before adding lubricating oil, whether the use of regular replacement of lubricating oil, such as not according to the requirements of lubrication, The reducer will not only produce too high "buzz" sound, but also excessive wear or damage gear and bearings. In order to prevent the expansion of the fault, no matter excessive wear or damage of the reducer gear, or damage of the reducer bearing, it is necessary to remove the repair or replacement immediately, fault, reduce the noise. 3, braking stop sliding distance over the specified requirements

Electric hoist for a long time out of use, some people mistakenly adjust the brake adjustment nut, or brake ring wear is too large, so that the brake spring pressure is reduced, braking force is reduced, when the stop, braking is not, sliding distance over the requirements, this situation as long as according to the electric hoist manual requirements, readjust the brake nut. But we should pay attention to the work, when lifting heavy objects, it is forbidden to adjust, check and repair the brake. Sometimes, adjust the brake nut, stop the sliding distance is still over the specified requirements, in such cases, it is necessary to consider other reasons, first open the brake ring, check whether there is oil on the brake surface, such as oil, friction coefficient is reduced, will make the brake skid, sliding distance over the specified requirements, only adjust the brake nut is not useful, At this time, only ** clean the brake surface (easy to clean light gasoline), and restore the friction coefficient of the brake surface; Secondly, if the brake ring is loose or damaged, the brake ring can not brake, only replace the brake ring; Sometimes it is found that the brake ring is not damaged, only the brake ring and the rear end cover cone contact is bad, braking, brake surface contact is too little, the braking force is too small, so that the sliding distance is too required, maintenance, in order to increase the braking force, should find out the position of the bad contact, repair, increase the braking contact surface, can not be repaired, need to replace parts; Electric hoist motor coupling by moving or stuck, stop, brake ring and rear end cover cone contact is not good or can not contact, the electric hoist braking effect is good or bad, this kind of situation, the coupling should be repaired or replaced. In addition, the long-term use of brake pressure spring fatigue, so that the spring force becomes smaller, stop, brake is not firm, should be replaced by spring, readjust brake force.

4, the motor temperature rise is too high should first check whether the electric hoist load use, load leads to motor heating, long-term load will burn the motor; Motor is not loaded, still hot, should check whether the motor bearing is damaged; It is also necessary to check whether the motor works according to the prescribed working system, which is also one of the reasons for the motor fever. When used, it should be strictly according to the working system of the motor. When the motor is running, the brake clearance is too small, not ** off, resulting in a lot of friction, friction heating is equivalent to increasing the additional load, so that the motor speed is reduced, the current becomes large and heating, at this time should stop working, readjust the brake clearance. 5, heavy objects rise to mid-air, stop after can not start the analysis of its reasons, first check whether the system voltage is too low or whether the fluctuation is too large, in this case, only after the voltage returns to normal start; On the other hand, we should pay attention to the lack of phase in the operation of the three-phase motor, and it can not start after shutdown. At this time, we need to check the number of phases of the power supply.

6, can not stop or to the location still do not stop

This kind of situation is generally the contact welding of the contactor, when the stop switch is pressed, the contact of the contactor can not be disconnected, the motor runs as usual, the electric hoist does not stop; To the position such as limit device failure, electric hoist does not stop. In this case, immediately cut off the power supply, so that the electric hoist forced to stop. After stopping, repair the contactor or stopper. If it is badly damaged, replace it.

7. Oil leakage of reducer reducer is caused by:

(1) When the sealing ring is poorly assembled or damaged between the reducer box and the box cover, the sealing ring should be removed and repaired or replaced;

(2) The reducer connecting screw is not tightened. After the machine is shut down, the screw should be tightened.

(3) The electric machine sweeps the chamber

The reasons for the sweeping are: serious wear of the supporting ring on the motor shaft, the displacement of the rotor core, or the displacement of the stator core due to other reasons, resulting in the clearance between the conical rotor and the stator of the motor. It is strictly prohibited to "sweep" the motor. When the sweep occurs, the supporting ring should be removed for replacement, and the gap between the stator rotor cone should be adjusted to make it even, or sent to the maintenance factory for repair. Through the analysis of common faults and treatment of electric hoist, the electric hoist maintenance personnel to deal with the fault, know where to start the inspection, improve the maintenance efficiency, in addition, but also for the operators to provide on-site methods to deal with problems.

What are the factors related to the lifting of hydraulic straight arm crane?

With the development of economy and the exchange of overseas trade and import and export trade, dock economy becomes more and more important. In the past, the wharf relied on manpower, but in order to improve the work efficiency, the application of mechanical equipment is more and more common, Marine crane, wharf crane, plays an important role in the handling of goods, promote the development of economy. What are the factors related to the lifting of hydraulic straight arm crane? Next Jianhu Yangfan Hydraulic Machinery Manufacturing Co., LTD. Xiaobian to take you to understand in detail.
1. Quality of the crane. Electric hoist is a kind of special lifting equipment, installed on the crane, gantry crane, electric hoist with small size, light weight, simple operation, easy to use and other characteristics, used in industrial and mining enterprises, warehousing, wharf and other places. The choice of good crane is the premise, the crane quality is good to ensure the safety of hoisting.
2. Voltage, the voltage of general wharf crane needs to be stable (explanation: stable and stable; There is no change), and the general use of electricity, if the voltage is unstable, it will lead to the motor's operation is not smooth, lifting component reduction. Cantilever crane belongs to industrial components, is a light work strength crane, composed of column, rotary arm rotary drive device and electric hoist, with light weight, large span, large weight, economic and durable. Usually lifting motor design rated voltage of 220v plus or minus 5v.
3. Diameter and length of wire rope. These elements are often overlooked. If you choose thick diameter wire rope or long length, the drum diameter will be increased, because the speed of the motor is certain, will cause the speed to accelerate, resulting in the reduction of crane momentum, lifting component reduction.
4. When hoisting, the Angle between the inclined arm and the column should be controlled within 45 degrees, and the less the Angle, the better. Electric hoist is a kind of special lifting equipment, installed on the crane, gantry crane, electric hoist with small size, light weight, simple operation, easy to use and other characteristics, used in industrial and mining enterprises, warehousing, wharf and other places.
5. Maintenance and maintenance of the crane, for example, in the appearance treatment, the surface of the component needs to be cleaned, coated with anti-rust paint and decorative paint film. In terms of lubrication, the lubrication of the internal equipment is very important, which is one of the important factors affecting the use efficiency and safety.

What are the protective devices of the crane

Crane protection device is indispensable, no matter what type of crane, it is necessary to install protection device, reduce the occurrence of safety accidents. The general necessary protection devices are overload protection device, torque limitter, position limitter, windproof device, anti backward tipping device, buffer, etc., then Jianhu Yangfan hydraulic machinery Manufacturing Co., Ltd. to take you to understand, how to test whether the performance is good, play the role of protection?
(1) overload protection device
This is to protect the equipment from overload, need to meet the requirements of the design, check whether the protection device is sensitive and reliable, check whether the mechanical, electronic and comprehensive overload protector alarm, cut-off power source set point comprehensive error is in line with the requirements.
(2) Torque limiter
Torque limiter is a safety device for boom crane to prevent overloading from tipping over. Check the sensitivity and reliability of the torque limiter through the increase method or the weight method to check whether the error is within the design range.
(3) Position limiter
Check the lifting equipment of the luffing mechanism, lifting mechanism, operating mechanism to reach the setting position when the alarm signal can occur, automatically cut off the power source running to the dangerous direction.
(4) windproof device
Mainly in the outdoor crane to install windproof device, when the wind speed set point or when the working wind speed can accurately alarm. It is necessary to check frequently whether the parts of the rail clamp, iron shoes and anchoring device are deformed and worn, and whether the performance is affected.
(5) buffer
This is to avoid collision, can be more safe operation, for different types of weight, running speed of different cranes, should check whether the configuration of the buffer match, and check the integrity of the buffer, running to both ends can touch the stop at the same time.

Hydraulic winch oil leakage and applicable motor what?

There are many kinds of hydraulic winch motor, if in the process of use will produce temperature, but if the temperature is too high, then it will cause the winch oil leakage, serious will cause the equipment can not be used, the following Jianhu Yangfan hydraulic machinery Manufacturing Co., Ltd. to introduce the winch oil leakage and temperature limit:
1. Oil Leakage:
1. Brake: No matter what brake is selected, only brake design can make the winch lift heavy objects stop in mid-air.
2, balance valve: installed balance valve to make your winch speed average, not down when heavy objects fall fast.
3, more than 90% of the oil leakage problem is because the rubber sealing ring for a long time by the alternating change of cold and warm temperature, resulting in the loss of a large number of plasticizers and softeners, corrosion aging hardening problem.
4. At first, the oil seepage slowly began to drip, and the sealing ring broke after a long time. Before, the oil leakage was solved by removing the engine and changing the oil seal.
motor
1. Generally, radial plunger motors are used, less axial plunger motors are used.
2, radial motor is mainly low speed large torque motor, large displacement can achieve 2 to 100 revolutions per minute, small point is more than a dozen turns to thousands of turns.
3, axial piston motor is mainly high speed and small torque motor, generally very low stable speed is close to 1000 RPM, high speed can reach 3000 RPM or even 6000 RPM.
3. The hydraulic system of the hydraulic station of the hydraulic winch allows the working oil temperature of the hydraulic oil to be about 90℃, which requires the oil to have better thermal oxidation stability.
Because of the different nature and use of hydraulic winch, its motor is different. When we choose, we should choose according to our own actual situation. In addition, the daily maintenance of good equipment can reduce its oil temperature rise, water leakage and other different problems.

Maintenance of hydraulic pump station common problems

Hydraulic pump station installation and maintenance, can not let dirt and iron pin fall into the car tank, but also to avoid gasoline pump suction pipeline leakage, oil friction resistance can not be very large. Second, the amount of oil in the car tank should be no less than the liquid level transmitter, and the filter device and gear oil should be dismantled and replaced on time to maintain the gear oil and system software clean and tidy.
Hydraulic pump station to prevent leakage, external leakage to prevent, although the internal leakage is difficult to avoid but can not exceed the required standard value, if the leakage is too much, will make the working pressure does not rise, the hydraulic system can not do the estimated torque, and will make the hydraulic system water temperature increase, the working component is unstable.
If the hydraulic pump station is found abnormal noise, or the occurrence of some abnormal problems such as unstable working pressure, it should be shut down immediately to analyze the causes of common faults, immediate fault detection, hydraulic system maintenance after operation, to prevent major accidents, and the working pressure and speed of the hydraulic system should be properly designed, can not exceed the limit application, in order to prevent accidents.
Maintenance of hydraulic pump station Common problems:
1. Prepare before work
1. Be sure to wear protective products at work, and wear helmets when entering industrial plants;
2. The station must be kept clean and tidy. The road surface and all the machinery and equipment are forced to be stained with oil.
Two, switch machine work
1, the hydraulic press should check the hydraulic transmission system before opening the pump, commonly used to open the valve fittings door is not open;
2, after the pump should be executed regularly to check whether each protection device is standard value, posture and do technical and inspection provisions;
3. After opening the pump, check whether the system software can stop automatically when the working pressure rises to the limit of the electric contact barometer.

Marine hydraulic windlass and characteristics are introduced in detail

Windlass can be divided into manual, electric, hydraulic, steam and so on according to the working mode of the control driver.
The windlass can be divided into 12mm-120mm and other models according to the diameter of the anchor chain.
Windlass in accordance with the steel wire reel spread and can be developed into one side and two sides of China.
The key of the hoist consists of the base, the support frame, the sprocket, the brake pedal, the sprocket chain, the transmission device, the electric control system (except the manual hoist) and so on. Electric winches have motors, hydraulic winches have hydraulic oil pumps and hydraulic motors.
Marine hydraulic windlass and characteristics are introduced in detail
The key technical performance analysis index of windlass mainly includes anchor chain diameter, nominal pressure change rate of windlass, rated load, applicable different loads, how many stages of speed regulation, electrical system, etc.
The windlass installed on the ship shall ensure that the winding edge of the anchor chain and sprocket chain is 117-120 degrees.
Characteristics of Marine hydraulic windlass
Marine hydraulic windlass is a high pressure oil drive motor, and then through the reducer (there is no reducer) to promote the transmission system transmission gear, so that the windlass running power device is stable, stable in work, conducive to maintenance, large tons of ship foundation is hydraulic.

How to guarantee the service life of Marine winch

In order to guarantee the service life of Marine winch, we should have the correct use method in the process of normal use. Different equipment, the specific use method will have some differences, carefully do a good job of relevant understanding, have the right use method, and then can guarantee the future results. In the process of ordinary application, according to the correct method, do a good job of corresponding use, which is the premise of ensuring the service life.
To the use of Marine winch, usually do a good job of maintenance. Check the equipment carefully every once in a while to ensure that it is in normal condition. If there are some problems found in some places, it is necessary to do a good job of maintenance work in time, these aspects will directly affect the future use. Do a good job of related maintenance, for the future use will be more secure, so you do in the process of doing, do these things, and then to ensure the specific service life.

What factors affect the quality of a Marine winch

The quality of Marine winch is not good, at this time we have to look at its specific principle of play. Different equipment play a role in the principle will have a certain difference, which directly affects his specific work efficiency in the process of work, so when we in the selection process, not simply to look at the external situation, but should look at the internal parameters, as well as specific principles, on this basis to make a comprehensive choice.
When people choose Marine winch, they want to ensure the quality of it. If they choose equipment produced by large manufacturers, these equipment will be better in quality, and generally there will be more guarantee, and it will be more good in the process of use. When choosing equipment, people need to combine multiple aspects and consider all aspects clearly, so that they can buy more suitable ones. Quality is the premise and foundation of use, and internal technology is an important factor to guarantee quality.