Company News | HGB

Successful Installation of Slewing Bearing for Shield Machine

2019-09-11/in Company News /by admin

Recently, our company (Luoyang Hengguan Bearing) has successfully delivered the slewing bearing of the shield screw conveyor manufactured for Fuzhou Metro Construction Co., Ltd. The slewing bearing on the equipment is imported products with long production and long transportation time and high price. The construction time is limited. After many times of communication between the customer and us, in the end, the products are produced by our company and manufactured according to the slewing bearing physical drawing paper.

In the early stage, our technicians went into the subway construction site and determined the product quality and accuracy requirements through detailed communication with the construction party on the product operating conditions, the performance of the main engine (screw conveyor) and the situation during operation. The product is installed vertically and is tilted during use. Because the screw is driven to transport the materials such as muck and gravel, and at the same time it need support the weight of the screw, it must withstand large radial force and overturn moment during work. The teeth of the outer ring of the slewing ring, as the transmission component, need to drive the screw with the materials such as muck and gravel at the same time.

Therefore, the tooth portion of the slewing bearing is subjected to a large driving force. It is very troublesome to disassemble the screw conveyor after entering the tunnel. Therefore, during the subway excavation process, the shield screw conveyor can not cause any errors.

In order to ensure the wear resistance and smooth running of the tooth part, the tooth part is specially quenched, the tooth surface and the tooth root hardness are improved, and the tooth grinding process is performed at the same time to improve the tooth precision and the surface finish. Because the product is used vertically, in order to ensure that the rolling body can rotate evenly during the rotation process, the overall material cage is used to ensure the flexibility and stability of the rotation. This product belongs to high-precision single row cross roller slewing bearing, outer diameter 1306mm, model D1797/954.

Our company adopts 42CrMo material and the material has been quenched and tempered to improve material performance. In the processing, each process is strictly controlled, and the measuring tools are inspected to ensure the rigor of the process and the accuracy of the dimensions, lay a good foundation for the subsequent processes, and make a record at the same time, and finally completed successfully.

In the finished product inspection, the bearing rotation is flexible, the inner and outer diameter dimensional tolerance is controlled within 0.08mm, the clearance is controlled within 0.09mm, the radial runout is controlled within 0.09mm, the end face of beating is controlled within 0.06mm, and the overall precision reaches P5. At present, the customer of this product has been installed and debugged successfully, and has achieved the same use of the original, and has been praised and praised by customers.

Stacker and reclaimer slewing bearing had been replaced and installed well

2019-08-27/in Company News /by admin

Recently, our company has supplied the slewing bearing for the bucket wheel stacker and reclaimer produced by a large thermal power plant in Northeast China. It has been sent to the user for installation and commissioning.

The stacker reclaimer, also known as the bucket wheel stacker reclaimer, stacker and reclaimer, is a new type of high efficiency continuous loading and unloading machine. It is mainly used for loading and unloading iron ore (sand), coal, sand, etc. in bulk storage yards for bulk cargo terminals, steel plants, large thermal power plants and mines. This machine is widely used at home and abroad because of its high operating efficiency. Generally, the rotating part of the large bucket wheel stacker and reclaimer is a large diameter slewing bearing. The user of this company cooperated with this bucket wheel stacker and reclaimer, which was produced by a heavy machinery factory in Changsha. The original large slewing bearing has been used for seven or eight years, and there is a rotation stuck, big noise and other issues.

Customer need replace the slewing bearing. After the previous communication, on-site understanding of surveying and mapping, our company confirmed that this set of products is a slewing bearing model 1797/2635 bearing commonly used in bucket wheel stacker reclaimers. It is a 1797 bearing series model commonly used by domestic big bucket wheel stacker and reclaimer manufacturers. This 1797 slewing bearing series includes 1797/2100, 1797/2460, 1797/2500, 1797/2600, 1797/2635, 1797/3230 six basics. Models, are the models of the slewing bearing of the stacker and reclaimer that our company hot sales products.

After 45 day production cycle, the slewing bearing is finished well. We despatch our technical staff to construction site to help install the slewing bearing.

We HGB seek to be representative of China top quality machinery supplier.

Excavator slewing bearing and pinion to Chile

2019-08-22/in Company News /by admin

On August 20, 2019, Luoyang Hengguan Bearing company finished slewing bearings and associated pinion gears for Chile customers.

The slewing bearing and pinion are applied to the excavator, and the bearing raceways and teeth are quenched to bear better surface stress.

We specialized in producing excavator slewing bearings for many years, and almost 500 types of slewing bearing are accumulated recently. In order to ensure the fastest delivery, we have a large stock for some hot sales types, our customized producing time is 7-15 days.

For Excavator, we can provide slewing bearing for Caterpillar, Komatsu, JCB, Volvo, Doosan and other brand.

HGB delivery SE7 slewing drive to Australia

2019-08-18/in Company News /by admin

On August 18, 2019, Luoyang Hengguan Bearing company will ship one set of SE7 slewing drive to Australia by air.

This slewing drive SE7 is used for crane. On the same time, we match cranking handle for our customer.

For slewing drive, we can produce size from 3 inch to 25 inch, including S, SE, WE, WEA, SDE, PE series and so on.

The products are widely used in PV, CPV, STP solar tracking systems and construction applications including truck cranes, manlifts, turntables, port machinery, modular vehicles, small wind power systems and statellite communications.

We seek to be representative of China top quality machinery supplier.

HGB slewing bearing for ship unloader

2019-07-01/in Company News /by admin

On July 1, 2019, our company (Luoyang Hengguan Bearing) produced large three row roller slewing bearing for the unloading machine in Fujian. The installation and commissioning was completed, and it was highly praised by the owners!

The original slewing bearing of this ship unloader is a slewing bearing with external gear four-point contact ball slewing bearing diameter 2240mm. Due to the actual working condition, the bearing capacity is large, and the instantaneous overturning force distance is large, and the original external tooth four-point ball slewing bearing can not meet the requirements of the actual working conditions.

After the detailed understanding of the working conditions, we design three-row roller slewing bearing with external teeth for customer. In the case where the dimensional parameters are unchanged (guaranteed to be installed), the structure of the bearing is changed to increase the bearing capacity of the slewing bearing.

In the later stage, in order to ensure the smooth installation of the products, our company dispatched technical engineers to the site to guide the installation of the owners.

After the perfect cooperation between the two parties, the unloader’s large slewing bearing was successfully installed and debugged successfully!

Introduction about the process of slewing bearing processing

2019-04-11/in Company News /by admin

1. Inspection of forging blanks

First understand the material of the blank and the state after forging before processing. Secondly, it is necessary to check whether the blank has defects such as lamination and cracks.
Measure the dimensions of the blank. Including the inner and outer diameter of the blank, the height dimension, calculating the machining allowance, and estimating the number of times of turning in the turning process more accurately.

2. Turning processing

Roughing: Roughing according to the turning process drawings, the cutting speed and cutting amount are strictly in accordance with the process regulations (the general cutting speed is 5 rev / min. The cutting amount is 10mm ~ 12mm).

Rough aging: After the roughing of the bearing parts is completed, the three-point support is adopted, and the flat parts are not allowed to be stacked. The aging time is not less than 48 hours before the finishing of the car can be carried out.

When the precision bearing parts are finished, the cutting speed is 6 to 8 revolutions per minute, and the cutting amount is 0.3 to 0.5 mm.

Forming Finishing Car: When the bearing parts are finally formed into the finished car, in order to prevent the parts from being deformed, the fixed clamping device of the parts must be loosened, so that the parts are in a state of no force, the turning speed is 8 revolutions per minute, and the cutting amount is 0.2 mm.

Cross, three-row roller slewing bearing inner ring special process: In order to prevent crossover, the inner ring of the three-row roller slewing bearing is deformed after heat treatment. In the turning process, it is necessary to carry out pair processing, that is, the raceway back-to-back processing, no cutting before heat treatment, and cutting after heat.

After finishing the heat: After the heat treatment of the inner and outer rings of the bearing, the finishing process is carried out.

3. Heat treatment

Quenching surface quenching: The bearing raceway surface is medium frequency quenched, the hardness is not less than 55HRC, the hardened layer depth is not less than 4mm, the soft belt width is less than 50mm, and the “S” mark is marked at the corresponding position.

After the heat tempering treatment: After the intermediate frequency quenching of the inner and outer rings of the bearing, it must be baked at 200 °C for 48 hours. To ensure the disappearance of internal stress.

4. Rolling and milling

For the slewing bearing with internal and external teeth, the hobbing process should be carried out before the grinding process, strictly in accordance with the process requirements, and the accuracy level should reach 8 or above.

5. Drilling

Marking: After measuring the dimensions of the parts, the lines shall be scribed according to the specified dimensions of the drawings. The positioning process shall not differ by more than 3 inches.

Drilling: Check the size of the scribe line against the drawing to ensure the correct size and then carry out the drilling process. The mounting hole of the slewing bearing of the inner body should be combined and processed, and the error of the hole distance of the 180C degree between the soft belts should not exceed 5‰.

6. Grinding processing

Rough grinding: It adopts medium corundum, soft three-grain degree is 36 degrees, and the atmospheric hole resin grinding wheel is used for grinding. The line speed is controlled at 1500 rpm to prevent the raceway burn. The maximum grinding depth must not exceed 1 mm.

Fine grinding: Grinding with a particle size of 46 degrees or 60 degrees resin grinding wheel, the grinding amount is less than the rough grinding process, and the finish should reach the level specified in the drawings.

7. Other parts

Rolling element: self-processing or steel ball roller of fixed-point manufacturer, the accuracy grade should meet the requirements of the drawings, the rolling elements are less than 5% of each other, and the surface magnetic particle inspection and ultrasonic flaw detection should be carried out before the bearing assembly, and the flaw detection report is issued.

Retainer: The retainer manufactured by the fixed-point manufacturer shall be used to meet the requirements of the drawings, and strict inspection shall be carried out before assembly and use, and a test report shall be issued.

Sealing ring: Sealing strip produced by fixed-point manufacturers. Strict testing should be carried out before assembly and inspection records should be issued.

8. Assembly

Preparation clearance: After the grinding process, the test assembly shall be carried out in order to measure the preliminary clearance. According to the calculation data and the test clearance, the final grinding process shall be carried out, and the final drawings shall be used to define the clearance.

Parts inspection: After the clearance is completed, the final part inspection shall be carried out and recorded accordingly.

Demagnetization, cleaning, packaging and issuing a certificate.

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