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Quick Details

  • Place of Origin: Hebei, China (Mainland)
  • Brand Name: Huifu
  • Model Number: ZGM
  • Type: Grinding Mill Machine Spare Parts
  • Color: You Decide
  • Material: Steel/cast iron /ceramic
  • Dimensions: Exactly Control within Tolerance
  • OEM: Available
  • Application: Cement/ Power Stations.
  • Processing Type: Casting
  • Usage: Machine, Electronic Components,Auto,Medical,Motor,and etc.
  • Toughness and Hardness: Can be Customised
  • Appearance: Casting by fine sand and it is smooth.

Packaging & Delivery

Packaging Details Standard Exported Packages for ceramic insert vertical grinding roller and ring
Delivery Time It depends on your ordering qty. It ranges from 30 to 40days.
Product Description

Product Application

The most important internals in a vertical mill are the rollers and tables (also called respectively vertical mill tires and rings). Several rollers (two to six according to the size of the mill) are placed around the table. A vertical mill takes its name after the vertical axis upon which it rotates. The material to be ground is fed into the mill from its top. It falls on the table placed at the bottom of the mill.

Due to the centrifugal force generated by the rotation of the main shaft the grinding rollers are pressed closely upon the grinding ring and grind the material fed into the mill (raw, cement or coal for instance) as they roll. The qualified material (i.e. the one which has reached the requested size) will leave the mill with the airflow while the unqualified one will be brought back to the grinding chamber for another round of grinding.

Tangshan Huifu manufactures vertical mill internals in high wear resistance steels and irons, be they standard mono alloys, bi-metal or composite (i.e. a metal matrix alloyed with an even higher resistance material like ceramic). Tangshan Huifu pioneered the use of composite solutions in vertical mill internals, vertical mill rollers as well as vertical mill tables (or vertical mill tires as well as rings).

For all vertical mill types (ball and roller mills) with different solutions to suit international standards (ASTM) as well as 100% in-house developed and patented solutions.

Equipment: Vertical roller mills & vertical ball mills.

Tech specs:
• For one-piece or segmented rollers and one-piece or segmented tables.
• Main alloys : international standards alloys and 100% home developed High Chrome Irons.
• High Chrome alloys ranging between 16% and 27% Cr with uniform hardness ranging between 57 and 64 HRc depending on alloy.

Key Benefits:
• Increased lifetime due to higher wear resistance (High Chrome is about 1.6 to 2 times better than Low Chrome).
• Increased service life when hollow balls / rollers and rings / table qualities are well balanced.
• Reduced production costs and increased maintenance cycle.

Company Informations

Tangshan Huifu Engineering Technology Co., Ltd. is fully integrated control of all like engineering contracting, engineering design, engineering technology, engineering and service. 


Huifu has developed into a major company carrying on the optimized design of crushing and screening system, calcium carbide furnace, heating furnace of steel rolling project project contracting, coking industry, dry coke quenching, while sales of vertical mill, coal pulverizer damageable parts, all kinds of conveyor feeding, crushing and screening system of equipment and spare parts.
The company is located in the north of China's heavy industrial city of Hebei, Tangshan City Province, the region's manufacturing industry has obvious advantages, all kinds of machinery manufacturing talent gathered. The company consists of two cooperation company ( like subsidaries ).
Main products: Accessories of ZGM medium-speed vertical grinding mill and other spare parts of conveyor and bucket elevator.One is to cast a vertical mill grinding medium wearing parts of the Foundry Company, another is to manufacture feed, crushing and screening equipment based machinery manufacturing company.
The company is divided into domestic and foreign countries have various types of professional and technical personnel and foreign trade sales personnel.
The company is willing to excellent talent, excellent equipment for the majority of users at home and abroad to provide quality service.

We are looking forward to your visit, making cooperation and getting win-win!

Background

1. General Outline

BEIJING POWER EQUIPMENT GROUP (BPEG) is the leading manufacturer of mills in China. BPEG has been manufacturing mills since the end of 1950's. Tangshan Huifu Engineering Technology Co., Ltd  has been committed to providing the same type of accessories .

4. ZGM roller vertical mill

4.1 Application

For all grades-ranging from hard lignite to anthracite. ZGM vertical mills have a firmly established reputation for economy in the preparatory processing of coal. They are used mainly in direct pulverized coal firing systems or steam boilers in power plant. They are also used for supplying pulverized fuel to industrial furnaces in steel works, to rotary cement kilns in cement works and coal gasification plants.

4.2 Grinding Principle

A grinding table rotating round a vertical axis is driven by a planetary gearbox. The grinding rollers, mounted in fixed positions, are pressed down on the table under loading. The axes of the grinding rollers are inclined at 12°~15°, in combination with the grinding surface of the table they achieve optimum grinding effect, as experience in actual plant operation shows.

The big grinding roller performs not only a purely rolling motion, but also a sliding motion because the roller axis and grinding table axis do not intersect in the plane of the table. The differential speeds due to this configuration are a desirable feature, producing an additional comminuting action by the shearing forces developed.

Large-diameter rollers can be arranged to run on a small surface area of the grinding table. Bearing in mind that the mill throughput rate increases in proportion to the square of the roller diameter. The advantage of using big rollers will be evident.

4.3 Operation and design features

The raw coal is fed centrally from above through the classifier mounted over the mill or from one side onto the rotating grinding table. On passing under the rollers the coal is ground by their action assisted by the pressure of the hydropneumatic spring loading of the roller. When the roller travels over the bed of material on the table, a system of loading frame and rods connected to the working piston of a hydraulic cylinder causes oil to be displaced from the space below the piston into hydropneunatic accumulators.

The pulverized coal is flung by centrifugal force into the zone over the nozzle ring (louver air ring) surrounding the table. Where the coal particles are swept upwards by the stream of hot air into the classifier. The intimate contact with the hot air causes the moisture contained in the coal to evaporate spontaneously, so that the desired exit temperature of the pulverized product from the mill (70°~120°) is already attained in the grinding chamber. The oversize particles rejected by the classifier fall back onto the grinding table for further size reduction. The fine particles, i.e., the finished product, are carried out of the classifier with the air.

The mill is driven by a special motor through a planetary gearbox. A segmental thrust bearing in the gearbox absorbs the forces exerted by the rollers. Before the mill drive is started, the grinding rollers are lifted hydraulically off the grinding table. This action is performed by oil pressure diverted from the cylinders exerting the spring loading. In this way, the mill can be started, either empty or filled with coal, with only a small starting torque, corresponding to about 40 percent of the rated torque. The special motor that can be started direct-on-line is adequate. No auxiliary drive is necessary.

4.4 Range of types

ZGM mills equipped with three rollers are used for coal grinding. The increase of radius of grinding table is applied in mills with a mean radius of grinding table from 650mm upwards.

4.5 Noise, Vibrations, Fire prevention

Industrial health and safety regulations lay down requirements with regard to noise emission, mechanical vibrations and safety of coal grinding mills.

In the power generating industry, the sound pressure level of a mill system, measured at a distance of one meter from it, is not allowed to exceed 85dB(A) under full load or part load operation or under starting or stopping conditions. In addition, these are regulations for limiting the vibration velocity of mill and building foundations over the whole load range, as well as safety regulations for the prevention of fires and explosions in coal grinding systems.

To meet these requirements, ZGM roller grinding mill incorporate various constructional design and control engineering features:

-Extremely quiet running is obtained because each grinding roller is individually mounted and restrained in the loading frame in combination with gentle hydropneumatic spring loading.

-Vibrations are prevented by raising and lowering the rollers, timed in co-ordination with the raw coal feed, on starting and stopping the mill.

-Movable clearing devices installed under the grinding table keep the gas flow duct free from foreign bodies and material that settles there.

-As all the internal surfaces of the grinding chamber are vertical or sloping, no deposits of coal can form on them.

Our Service

Please provide you require with professional accessories drawings, or directly tell us you vertical mill machine model, we can provide standard accessories.

Packing & Delivery
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FAQ

1. Q: What kinds of products do you offer?

A: HuiFu Machinery provided parts are mainly related to your plant machine. It ranges from excavator buckets , crusher spare parts, construction machinery parts, conveyor, beneficial equipment spare parts, grinding mill spare parts, machining spare parts and other customized spare parts.

2. Q: What kind of materials are you familiar with?

A: We are familiar with carbon steel, alloy steel, standard wearing plate, high material steel, high chrome steel, casting iron, and bronze.We have begun to research ceramic insert material technology.

3. Q: What’s the maximum single weight that can be casted? What is your processing capacity per day ?

A: The single weight that can be casted at one time is 13 metric tons. The capacity is 80 tons per working day.

4. Q: What information do we need to provide to you in order to confirm our parts order?

A: We work with technical drawings for any non-standard products. If the order is for standard parts,you only have to provide us with the part number so we may define the parts of the order.

5. Q: May we visit the factory?

A: Yes, you can visit the factory during working days and our sales team would be happy to assist you.It is possible, to take the high speed train from Tangshan station to the factory and we can pick up you at the airport or train station.

6. Q: If your product has inferior quality or quality problem after we use them what happens next?

A: First of all, you have to provide us photos of the problem part and also provide photos of the machine so we can see how the part was installed and gather other necessary information to define the root cause of the problem.

If it is indeed a quality problem of the product itself, we would offer compensation to you and also figure out solutions to avoid this quality problem in the future. If the problem is caused by clients,we only provide the technical suggestions to our client to avoid same problems.

7. Q: Except for your products, do you offer some other services or new business opportunities?

A: Yes, we provide lots of service to you as you can see on our service. Huifu Machinery has lot of new ideas for working with you and keeping your business moving forward.

If you did not see the question you are having, please email us for further assistance.

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