Industry News | HGB

Slewing bearing for public works machine excavator

2020-05-13/in Industry News /by admin

Slewing bearings are widely applied in machines for public works. Usually the slewing rings for public works need to have high rigidity, undertake heavy loads, provide stable rotation, and resistant to impact load. Easy to disassemble or install is also an important factor.

Slewing bearing for excavators
(crawler excavators, wheel excavators, light duty excavators, etc.) Big size slewing bearing with external gear teeth or internal gear teeth are often used on the base of the excavator, which connecting the cabin and the base. Small size slewing bearings are often used in the swiveling boom of the excavators.
We can provide many brand of excavator slewing bearing , like Caterpillar, Komatsu ,Dawoo,Hitachi and so on
Caterpillar Excavator 320B, 320L, 215B, 225B, 980C, 3408B, 3306, 3406, 320, 245B models, for Komatsu Excavator PC60, PC100-5, PC120, PC200, PC220, PC300, PC400 models, Volvo EC210B, EC210, 240, 240 models, Hitachi EX60-2, EX60 EX60-1-5, EX120 EX100-1-5, EX200-1, 2, EX200 EX200 – – 3, EX300 EX200-5-3, 200, ZAXL350 models, etc.

HGB Slewing Drive Simple Introduction

2019-12-13/in Industry News /by admin

The slewing drive is a full-circle slewing reduction transmission mechanism that integrates a driving power source. It uses a slewing bearing as a transmission follower and a mechanism attachment. By attaching a driving member and a drive source to one of the inner and outer rings of the slewing bearing And the cover, and the other ring is used as both the driving follower and the connection base of the driven working part. This makes use of the characteristics of the slewing bearing itself as a full-circle slewing connector to efficiently configure the driving power source and the main transmission. Parts, making it a universal reduction transmission mechanism that integrates slewing, deceleration and driving functions, yet has a simple structure and is easy to manufacture and maintain.

According to the type of variable speed transmission of slewing drive, it can be divided into toothed slewing drive and worm gear slewing drive, inheriting the characteristics of gear drive and worm gear worm drive. These two types of slewing drive can be adapted to medium and high-speed applications In terms of load-carrying capacity, the worm gear and worm gear perform better than the tooth type. When the envelope worm drive is used, its load-carrying capacity, anti-deformation ability, and transmission rigidity are further improved. However, the worm gear worm rotary drive is more efficient in terms of efficiency. Inferior to toothed slewing drive.

According to the openness of the slewing drive transmission, the slewing drive can be divided into open and closed. Generally, the open structure is mostly used in applications where the environment is too harsh and the maintenance and repair cycle is short. Inspection, maintenance, and service are also easier to replace. Where the environmental conditions do not change much and the environment pollution level is below moderate, the closed structure can provide a long maintenance life cycle.

Insufficient High End Market for Slewing Bearings

2019-12-10/in Industry News /by admin

China’s slewing bearing market demand will be saturated. In view of the fact that China’s slewing bearing production tends to be saturated at present, it has few high-tech contents and the quality is not too hard. Looking at the market of excavators with high requirements for slewing bearing tooth quenching and raceway quenching, domestic excavators are used in projects. All imported equipment, Komatsu in Japan, Hyundai in Korea, and Caterpillar in the United States, although the price is expensive, the construction unit still selected it. The main reasons for purchasing capital are high quality, key components with high reliability, long service life, and easy damage. The anchor cannot be thrown at critical times, the construction period cannot be delayed, credibility cannot be affected, and some engineering disputes can be avoided.

There are many factors restricting the development of China’s excavators, but the quality of mechanical parts, such as slewing bearings and hydraulic components, is not hard, which is an important link. From the comparison with foreign slewing bearings, the materials and heat treatment technology and tooth hardening technology of domestic slewing bearings are far behind. This requires the unremitting efforts of the majority of engineering and technical personnel to study hard and strive to catch up with the world’s advanced technology as soon as possible for slewing bearings. Go abroad and lay the foundation for the world.

Application of Slewing Drive

2019-12-06/in Industry News /by admin

The slewing drive is a new type of slewing product, usually called slewing bearing. It is usually composed of the worm, slewing bearing, housing, motor, and other components. Because the core component adopts slewing bearing, it can bear axial force, radial force, and overturning moment at the same time.

Application areas of the rotary drive

Compared with the traditional rotary products, the rotary drive has the advantages of simple installation, easy maintenance, and greater installation space-saving. This product can be widely used in construction machinery and new energy fields such as solar tracker systems, heavy-duty flatbed trucks, container cranes, truck-mounted cranes, aerial work vehicles, wind power generation and so on.

Advantages of Luoyang Hengguan Slewing Drive

1.Slewing drive: open type (S series), with housing type (SE series), double worm (S / SE-2 series), vertical type (VE series) and dual-axis type (SDE series), and can be customized according to customers’ technical requirements design products of any specification and structure. Products are widely used in solar power generation, construction machinery, construction machinery, metallurgical mining machinery, ship and port machinery, and other industries.

2.People-oriented, scientific management, honesty and trustworthiness, pioneering management principles, advanced production equipment, sophisticated processing technology, and perfect testing methods will help the company build a well-known brand of customer satisfaction and reassurance.

3.Technology: Constant innovation keeps the design performance of Hengguan rotary drive products in line with international standards.

4.Manufacturing: Each process adopts advanced CNC processing technology and equipment and 100% rigorous testing before leaving the factory, which makes Hengguan rotary drive products of excellent quality.

5.Management: The entire manufacturing process adopts modern scientific management methods to make each step of the production process traceable.

6.Service: Carefully designed and precision manufactured to meet customer requirements, providing high-quality rotary drive products that meet customer requirements, so that our dedicated service runs through.

The Rapid Development of the Photovoltaic Tracking Market

2019-12-02/in Industry News /by admin

Not long ago, a report by IHS Markit pointed out that the global single-axis solar photovoltaic tracker shipments increased by more than 40% in 2018, and the total volume exceeded 20 Gigawatts. The global photovoltaic tracker market will benefit from new technologies and Market, maintaining the momentum of rapid growth.

In recent years, the photovoltaic tracker market has been increasing year by year. In emerging markets, especially in the Middle East and North Africa, the financial community and end-users have embraced the tracking system. Based on the expansion of public utilities and market experience, the financial industry and power station owners are more interested in tracking. High long-term stability and high returns. With the widespread application of high-efficiency components and double-sided technology in these years, the cost of electricity for photovoltaic tracking systems will continue to decrease. The stability and reliability of the rotating reducer, the core component of the photovoltaic tracking system, plays an important role in ensuring the superiority of the tracking system.

Luoyang Hengguan is a professional solar tracking system rotary reducer manufacturer, which has witnessed the development of global photovoltaic tracking system. In 2019, the company maintains a steady growth in order volume, and the overseas market is growing at a rapid pace. The domestic owners’ recognition of the tracking system will further increase. The superiority of the photovoltaic tracking system will be more obvious in the future. The proportion of the system has also increased year by year.

It is understood that the slewing drive is one of the core components of the photovoltaic tracking system. Luoyang Hengguan is a global manufacturer of slewing transmission components and has accumulated rich experience in global projects. The company always insists on leading the development trend of tracking reducers with technological innovation and maintains close cooperation with the world’s leading manufacturers of photovoltaic tracking systems. The development of the global photovoltaic tracking market is expected in the future. With the entry of new entrants, the competitive environment in this market will be intensified.

A Brief Introduction to Robot Bearings

2019-11-26/in Industry News /by admin

In recent years, with the continuous development and improvement of technology, robots have been widely used in industrial and manufacturing fields. As one of the key parts of robots, robot bearings have played a key role in the operation of robots.

First, common bearing requirements for robots

1. Can withstand the axial, radial, overturning and other integrated loads.

2. Small size and lightweight.

3. It must have the technical characteristics of high load, high slewing accuracy, high running stability, high positioning speed, and high repeat positioning accuracy.

4. It can meet the characteristics of long life, low friction torque, high reliability.

Because of the particularity and complexity of the robot’s working environment, bearings that meet the above requirements must be required to fit in the robot to ensure safe use.

Second, the robot commonly used bearings

Due to technical requirements and environmental influences, the development of modern industrial robots has become lighter, which requires that the supporting bearings have a more lightweight structure. Bearings must meet the performance requirements of industrial robots on bearing capacity, accuracy, stiffness, and frictional torque within a limited installation space. It is difficult to meet this requirement with standard general-purpose bearings. At present, there are two major types of bearings commonly used on robots. One is a thin-walled bearing of the same cross-section, and the other is a cross cylindrical roller bearing.

1.Equal-section thin-wall bearings

Equal-section thin-walled bearings are different from ordinary bearings in that their cross-sections are mostly square in size and their dimensions are designed to be fixed. In the same series, the cross-sectional dimension is constant, and it does not increase with the increase of the inner diameter, so it is called a constant-section thin-wall bearing. Equal-section thin-wall ball bearings include thin-wall four-point contact ball bearings, thin-wall angular contact ball bearings, and thin-wall deep groove ball bearings. They are mostly used in the waist, elbow, and wrist parts of industrial robots. In the case of the same internal diameter, thin-walled ball bearings with more sections have more steel balls than standard rolling bearings, so the internal force distribution of the bearing is improved, the elastic deformation at the contact between the steel ball and the channel is reduced, and the bearing’s Carrying capacity.

2. cross cylindrical roller bearings

The internal rollers of the cross cylindrical roller bearings are arranged at 90 ° perpendicular to each other. A single bearing can simultaneously bear the combined effects of radial force, axial force and overturning moment. A cage is installed or isolated between the rollers The block can prevent the inclination of the rollers or the mutual grinding between the rollers, and effectively prevent the increase of the friction torque. In addition, the rollers are arranged in a vertically crossed arrangement to avoid the locking of the rollers. At the same time, because the inner and outer rings of the bearing are divided, the gap can be adjusted, and even if pressure is applied, high rotation accuracy can be obtained. Crossed roller bearings are widely used in industrial robots for waist rotation, articulated robot shoulders, arms, wrists and other rotating parts due to their light composite structure, high turning accuracy, good rigidity, and stable friction torque.

Robot bearings must not only ensure sufficient bearing capacity but also require precise positioning and flexible operation. Therefore, bearing design analysis must consider a number of indicators for optimal design. In addition to the above two kinds of bearings, there are harmonic reducer bearings, linear bearings, articulated bearings, etc. in the robot, but mainly used are thin-walled bearings and thin-walled cross roller bearings of equal cross-section.

Brief Introduction of Wind Turbine Slewing Bearing

2019-11-13/in Industry News /by admin

In recent years, with the rapid development of the economy and population expansion, the demand for energy has also increased. Directly leading to energy reduction, environmental pollution problems have intensified. The country is vigorously developing clean energy. Wind power generation is a mature and promising power generation method in new energy power generation technology. Its safety and cleanliness have been rapidly developed at home and abroad in recent years. The slewing bearing of the wind turbine is an important part of the mechanical equipment, which ensures the normal operation of the wind power generator.

First, the definition

Wind turbine bearing can also be called wind power bearing. It is a kind of special bearing. It has a harsh environment, high maintenance cost, and high life. Wind turbine bearings mainly include yaw bearing, pitch bearing, spindle bearing, and shifting box bearings, generator bearings.

Second, wind power bearing structure

The structural forms of bearings for wind turbines mainly include four-point contact ball bearings, crossed roller slewing bearings, cylindrical roller bearings, spherical roller bearings, and deep groove ball bearings. The yaw bearing is installed at the connection between the tower and the cockpit, and the pitch bearing is installed at the joint of the root of each blade and the hub.

Third, technical requirements

1. material standards

The standard stipulates that the material of the yaw and pitch bearing ring is 42CrMo. The heat treatment is treated by integral quenching and tempering. The hardness after quenching and tempering is 229HB-269HB, the surface of the raceway is quenched, and the quenching hardness is 55HRC-62HRC. Due to the complicated force of the yaw and pitch bearings of the wind turbine and the relatively large impact and vibration of the bearing, the bearing is required to withstand both impact and large loads. The life expectancy of the wind turbine’s main engine is 20 years, and the cost of bearing installation is relatively large. Therefore, the life of yaw and pitch bearing is required to reach 20 years.

2. low-temperature impact

Low temperature impact energy requirements for yaw and pitch slewing bearing rings: -20°CAkv is not less than 27J, and the Akv value in the cold state can be determined by the user. Wind turbines may work in extremely cold areas, with ambient temperatures as low as -40 °C, bearings operating at around -20 °C, and bearings must withstand large shock loads at low temperatures.

3.bearing clearance

Yaw and pitch bearings have special requirements in terms of play. Compared with the yaw bearing, the impact load of the pitch bearing is relatively large, and the vibration of the wind blows onto the blade is also large, so the clearance of the pitch bearing is required to be zero clearance or a slight negative clearance value, so that in the case of vibration lower the fretting wear of the bearing. The yaw bearing requires a small clearance value.

4.anti-corrosion treatment

Wind turbine equipment works in the field, and part of the yaw and pitch bearings are exposed to the outside and will be polluted by the atmosphere. The high humidity environment will also corrode the bearing base. Therefore, the yaw and pitch bearings exposed outside are eroded. The surface is required to be treated with anti-corrosion treatment, usually galvanized. Paint protection treatment is applied outside the galvanized layer as needed.

The slewing bearing of the wind turbine is an extra large bearing, which is mainly used for pitch and yaw systems. The load is complicated and the disassembly and maintenance is very difficult. Therefore, the design and manufacturing requirements of the wind power slewing bearing are strict. Due to its large size and difficult installation and disassembly, the maintenance is very difficult, and the failure of the slewing bearing will directly affect the working performance of the wind turbine and even cause downtime. Therefore, the wind power slewing bearing is required to have high reliability and long service life, and at least to reach the service life of the wind power generator, that is 20 years.

Causes and Troubleshooting of Crane Rotation Failure

2019-11-08/in Industry News /by admin

Crane is a common engineering machinery equipment. It is mainly used in the construction of bridges, roads, and port projects. Due to the working environment and overloading, there is often no turning action during work, which not only affects the overall performance of the equipment, It also delays work efficiency. Today, we mainly introduce the causes and troubleshooting methods of common crane rotation failures.

The crane does not rotate, mainly dues to the mechanical transmission of the slewing mechanism or its electronic control system fail. Today, we mainly discuss the non-rotational failures of tower cranes (Towers) and gantry cranes, analyze the causes of the failures, and propose ways to eliminate them.

First, mechanical failure

The slewing bearing of the crane acts as a connection between the upper and the chassis in the slewing mechanism while supporting the entire rotating portion of the crane. The main cause of mechanical failure: slewing bearing wear. When the crane works in an environment with strong corrosiveness and dust, or after large rainwater has passed, the steel ball in the slewing bearing is damaged and the raceway is worn. Both will affect the work of the slewing mechanism. In severe cases, the slewing mechanism will experience heavy rotation and noise. Violation of the operation, such as lifting the weight, when using the basic arm of the crane to pull and tilt the heavy objects in the distance to achieve the purpose, often erroneously use the slewing mechanism to diagonally pull, this is a violation of the safe operating procedures. At the same time, the slewing mechanism and the basic arm are also damaged.

Remedy: Repair or replace the slewing ring bearing. Wipe in time, add a proper amount of lubricant to the inside of the slide, and apply some anti-rust oil to the outside. The grease nipple should be unblocked frequently to prevent clogging, and the tightness of the bolts everywhere should be checked frequently to prevent the gap between the upper and lower landslides from being too large due to the looseness of the bolts, resulting in wear of the steel balls and raceways.

Second, the rotary hydraulic system is low

When the pressure of the rotary hydraulic system is low, the sound and speed of the rotary process are normal under the condition of the no-load or light load of the crane; when it is heavy, there will be difficulty in turning or even no turning. The reason for this phenomenon is that the spring of the overload buffer valve of the rotary hydraulic system is softened. The pressure of the rotary hydraulic system is realized by adjusting the screw of the overload buffer valve. This adjustment screw also has the function of sealing the oil passage. In order to ensure the sealing of the oil passage, the screw must be tightened, but the spring cannot be adjusted at will. The pressure is gone. Remedy: When the spring pressure is not enough, only use the spring end to add a washer to solve or replace the new spring.

Third, the rotary electronic control system has failed

First, the rotary motor burns or the carbon brush breaks to produce a short circuit, and the carbon brush wears to cause an open circuit with the slip ring; the second is that the brake electromagnetic coil is burnt, causing the brake friction plate to lock and can not release the brake; the third is the electronic component The damage is broken or the fuse is blown; the fourth is the damage of the contactor that controls the rotation; the fifth is the damage of the relay that controls the rotation; the sixth is the poor contact of the electrical part of the main controller (the main switch).

Remedy: If the rotary motor burns, it is often caused by excessive load, phase loss of the three-phase power line or short circuit. If the slewing load is too large and the three-phase power line of the slewing motor is out of phase, the motor will be burnt. At this time, stop the operation immediately. Carbon brush breaks are prone to short circuits and high-quality carbon brushes should be used. The carbon brush should be maintained in time to replace the carbon brush with excessive wear. If the brake solenoid is burnt, check the solenoid. When checking, turn on the power of the electromagnetic coil to be inspected, and use a screwdriver to check whether the electromagnetic coil generates suction force to the screwdriver. If there is suction, it means that the electromagnetic coil is not broken, otherwise, the electromagnetic coil is broken, and the new electromagnetic coil should be replaced. Also, check the brake lining wear and replace if necessary. If the electronic component is damaged or its fuse is blown, replace the fuse in the electronic component or electronic component. If the contractor and relay that control the rotation are damaged, replace the new one. If the main controller of the swing is in poor contact, adjust or replace the contact or master controller assembly.

If there is a crane rotation failure during work, it should be stopped immediately to prevent the equipment from working, which not only affects the performance of the whole machine but also greatly reduces the life. Luoyang Hengguan Bearing Technology Co., Ltd. is a comprehensive enterprise integrating slewing bearing design, research, and development, production, sales, and service. If you have any other questions, please contact us.

What are the failures of tower crane slewing bearing?

2019-10-30/in Industry News /by admin

With the rapid development of the national economy, the construction of the project is spread over cities, roads, mountains, and rivers. As one of the important equipment for engineering construction, tower cranes play an important role. The slewing bearing, as a key component of the tower crane, directly affects the working efficiency of the tower crane. Due to the long-term load work and the working environment, there are some faults in the slewing bearing during use, which affects its normal operation. Today, Luoyang Hengguan Bearing company will explain to you the common tower crane slewing failure and its causes.

First, broken teeth

1. Broken teeth are often directly related to improper installation.
The size of the gear is not properly installed during installation. The gap does not meet the requirements, and the two teeth are not properly meshed during operation to cause broken teeth. The teeth clearance should be adjusted as required; the meshing clearance is not adjusted at the maximum position of the tooth jump as required, causing the pinion to become stuck when the meshing gear is engaged with the maximum position of the large gear toothing, causing the green tooth to be in place. The pinion gear is adjusted and then tested according to the requirements. The large and small gear axes are not parallel. After installation, the large and small gears mesh poorly, causing broken teeth. The two gears should mesh in parallel. The slewing bearing mounting bolts are not tightly fixed, causing broken teeth, the bolts should be tightened as required.
2, the operation is not standardized
Violation of the operating procedures, overload, and high-speed rotation, the host crashes into obstacles. It should be operated strictly in accordance with the operating procedures. When the slewing bearing is engaged with the pinion, foreign matter is caught. It should be ensured that the large and small gears are clean and checked frequently.

Second, the grease problem caused abnormal noise

The slewing bearing of the tower crane is lubricated with grease, and the abnormal noise is most likely caused by lubrication problems. Common causes are the lack of grease in the raceway, uneven grease filling, poor grease quality aging, and incorrect lubricant selection. To solve this problem, you only need to use the right lubricant, timely filling, and timely replacement.

Third, foreign objects in the slewing ring

When the inside of the slewing bearing has foreign matter such as sand particles or iron filings, non-periodic vibration occurs, and there is also a failure in which the rotation is inflexible. When encountering such a situation, it is necessary to strictly clean the bearings, shafts, seat holes, and matching parts before installation, and remove the foreign matter in the lubricant in time; remember to avoid the use of plastic cages with impure materials or embedded foreign objects. This will remove the corresponding abnormal noise.

Fourth, the seal is broken

Check the seal is wear or not because the structure of the slewing bearing seal plays a key role in the sealing. When the seal and the slewing ring do not fit completely, it is easy to cause grease leakage. In addition, the weathering resistance and butter resistance of the sealing strip material also issues to be considered.

Five, loose bolts

1. The mounting bolts are loose, causing shaking during work. Please inspect all inner and outer ring mounting bolts immediately and tighten them as required.
2. Check whether the operation is overloaded and operate in strict accordance with the regulations.
3. long-term overload operation, resulting in the crushing of the raceway, the gap is too large.

Sixth, the raceway and rolling elements are seriously worn

The tower crane has abnormal noise during the turning process, which is most likely caused by severe wear of the slewing bearing raceway and the rolling element. At this time, the slewing bearing needs to be repaired or replaced.

The above is the analysis of the slewing bearing failure of the tower crane. Luoyang Hengguan Bearing Technology Co., Ltd. mainly produces slewing bearing/slewing bearing with diameter of 200-9800mm and various high-precision slewing bearings, large thrust ball bearings, non-standard special-shaped bearings, etc. The precision covers four P0, P6, P5, and P4. Grades. Our products are widely used in new energy, medical, amusement, automation, lifting, construction, mining, metallurgy, port, textile, shipbuilding, environmental protection, aerospace, wind power, and other fields.

How to solve the problem of large gap between the top ring and bottom ring of the excavator slewing bearing?

2019-10-11/in Industry News /by admin

Excavator is an indispensable mechanical device in the construction of today’s engineering equipment. Powerful robotic arms and buckets can excavate the earth and then load it into the transport vehicle. This series of operations are inseparable from the working device of the excavator. The important joint in the working device is the slewing bearing. The quality of the slewing bearing directly affects the normal operation of the excavator. During the daily use of the excavator, sometimes there is a problem that the upper ring and lower ring gaps of the excavator turntable are large, or the bearing is stuck and damaged. How can we use the maintenance to solve these problems?

First, the reason and solution for the large gap between the top ring and bottom ring of the excavator slewing bearing

The reason for the large gap between the upper ring and lower ring sides of the excavator is that the lack of grease lubrication causes the rollers to become smaller when the wear is worn, the butter leaks out, and further causes wear, and then the excavator slewing bearing has a problem of large gap between upper ring and bottom ring. That is, the excavator turntable is disassembled, and then repaired, the roller is replaced and repaired, and the repaired excavator slewing bearing should be replaced in time.

Second, the other problems of the excavator slewing bearing and the maintenance

1. Teeth are broken

Broken tooth is another common problem of excavator slewing bearing. It should be stopped in time after the broken tooth, and repair and replacement should be carried out in time. The broken teeth of the excavator slewing bearing are mostly due to improper adjustment of the side gear of the large and small gears during installation, which does not meet the requirements. Causes the two gears to be misaligned during operation, causing broken teeth; or the meshing gap adjustment between the pinion and the pinion is not required as required, causing the pinion to become stuck when the meshing gear is engaged with the large gear toothing position during operation; The non-parallel axes and the slewing bearing mounting bolts are not tightly fixed, so that the large and small gears are poorly engaged and the teeth are broken.

The excavator slewing bearing should be repaired in time after the broken teeth appear. If it is repaired by the maintenance personnel, it must be replaced in time. In order to avoid the occurrence of broken teeth, maintenance should be carried out when the installation is used. The following points should be made: the backlash should be adjusted strictly according to the requirements; the meshing adjustment should be carried out with the small gear in the position where the green paint is applied, and the test should be carried out according to the requirements. Operation ensures that the two gear axes are parallel; tighten the bolts as required; operate in strict accordance with the operating procedures; ensure that the size gears are clean and check frequently.

2. Abnormal sound

The abnormal sound is also one of the common problems of excavator slewing bearings. Abnormal noise is an abnormal sound. It will have a certain sound when it comes to new products. It is normal, but it should be replaced in time when it lasts for a long time. Sometimes it is installed after installation. There will also be abnormal noise. In this case, it is necessary to check whether the installation is correct. The abnormal noise generated during the use may be the lack of grease in the raceway or the foreign matter mixed in the raceway. When the noise occurs, it is necessary to check the excavation in time. Whether the various structures of the slewing bearing are complete, and the fault is eliminated.

The above is the analysis of how to solve the problem of the upper ring and lower ring clearance of the excavator turntable. For the excavator slewing bearing, there will be many problems in the process of use, such as large gap, broken teeth or abnormal noise. These problems should be repaired or replaced in time. If you can’t solve them yourself, you must contact the manufacturer in time to provide professional guidance to avoid direct damage.