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2024-03-22

In 2023, 17 enterprises will produce more than 50 million tons of raw coal.

In 2023, 17 enterprises will produce more than 50 million tons of raw coal.
According to preliminary statistics from the Statistics and Information Department of the China Coal Industry Association, in 2023, there will be 17 enterprise groups with a raw coal output of more than 50 million tons. The combined raw coal production of the 17 companies was about 2.79 billion tons, an increase of about 0.07 billion tons or 2.6 percent over 2022.

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2024-03-22

Coal Mining Equipment Upgrade to "Intelligent Manufacturing"

Coal Mining Equipment Upgrade to "Intelligent Manufacturing"
How long does it take to dig a 6000-meter roadway on a face with an annual coal output of more than 10 million tons? The answer is 4 months. The Caojiatan Coal Mine of Shaanxi Coal Group, located in the hinterland of the Maowusu Desert, can dig 55 to 65 meters of roadway a day with the help of advanced intelligent tunneling equipment, which effectively guarantees the development of coal mining work.

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2024-03-22

Difficult to mine coal resources "double gas co-mining" to achieve underground coal gasification one-time successful ignition

Difficult to mine coal resources "double gas co-mining" to achieve underground coal gasification one-time successful ignition
Recently, Xinjiang Yaxin Coalbed Methane Investment and Development (Group) Co., Ltd. presided over the successful one-time ignition of the underground coal gasification (UCG) test, a major scientific and technological project, and at the same time realized the "double gas co-mining" of difficult-to-mine coal resources. This technology is the first in the world.

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Rock chisel mechanical splitting machine used in stone crushing splitting rock concrete decomposition

Rock chisel mechanical splitting machine used in stone crushing splitting rock concrete decomposition

After the continuous upgrading and transformation of the fierce rock technology, the rock drilling machine can not only use the rock drill to drill holes, but also use the splitting machine to split rocks. The integrated operation saves labor costs and has high mining efficiency. After making full use of second-hand excavators, after the drilling machine head is disassembled, it can also be restored to excavators for excavation operations. It can be applied to rock crushing and splitting and rock concrete decomposition to gnaw hard bones.

22

2024/03

Mobile large rock splitting machine performance characteristics

Mobile large rock splitting machine performance characteristics

The mobile large rock splitting machine uses hydraulic pressure to expand and crack the rock, and the rock is rapidly expanded and cracked to facilitate the crushing of the rock. It has great technical advantages in crushing the rock when it cannot be used in mining and building earth and stone works. Split broken rock without vibration and sound silence.

22

2024/03

Comparison of Advantages and Disadvantages of Hydraulic Rock Drill and Pneumatic Rock Drill

Comparison of Advantages and Disadvantages of Hydraulic Rock Drill and Pneumatic Rock Drill

Fast drilling speed. Hydraulic rock drill whether it is the impact power, torque and rock drilling during the propulsion is very large, in the rock drill stroke under the action of high-speed rotation of the rod operation, at this time the hydraulic rock drill drilling speed is about 3 times the pneumatic rock drill, according to the soft and hard degree of the rock speed changes.

11

2020/03

Bimetallic Screw and Barrel Bimetallic Process

Bimetallic Screw and Barrel Bimetallic Process

Bimetallic screw and barrel bimetallic process is a commonly used process combination product with excellent corrosion resistance and wear resistance in recent years. HVOF high-speed spraying equipment is used to spray the surface of the screw to obtain a dense bimetallic screw. The bimetallic barrel adopts the method of melting and casting, and the alloy with high carbide composition and the barrel are cast into one body, and the special technology is used for precision molding.

15

2019/05

Daily Maintenance Method of Twin Screw Extruder

Daily Maintenance Method of Twin Screw Extruder

Daily maintenance method of twin-screw extruder: 1. after 500 hours of use, there will be iron filings or other impurities in the gear box, so the gear should be cleaned and the lubricating oil of the gear box should be replaced at the same time. 2. after a period of time to carry out a comprehensive inspection of the extruder, check the tightness of all screws. 3., if there is a sudden power failure in production, the main drive and heating stop, when the power supply is restored, the barrel must be reheated to the specified temperature and heat preservation for a period of time before the extruder can be started. If the 4. finds the steering full degree of the instrument and pointer, check whether the contact of the equilateral line of the thermocouple is

15

2019/05

Refurbished Barrel Process

Refurbished Barrel Process

The hardness of the inner surface of the barrel is higher than that of the screw, and its damage is later than that of the screw. The rejection of the barrel is the increase in the inner diameter due to time wear. Its repair method is as follows: 1, due to wear to increase the diameter of the barrel, if there is a certain nitriding layer, the barrel hole can be directly boring, grinding to a new diameter size, and then according to the diameter of the preparation of new screw. 2. The inner diameter of the cylinder is machined and trimmed to re-cast the alloy with a thickness of 1~2mm, and then finished to size. 3. Under normal circumstances, the homogenization section of the barrel wears faster. This section (5 ~ 7D long) can be trimmed by boring and equipped with another

15

2019/05

Injection molding machine screw barrel hardware problems

Injection molding machine screw barrel hardware problems

If the screw slip is caused by equipment rather than process settings, the wear of the screw and barrel may be the culprit. The resin melts in the transition section and sticks to the barrel wall, just like the feed section. As the screw rotates, it shears the melt down and transports it to the front end. If the screw and the barrel are worn, it is difficult for the screw to effectively convey the material to the front end. If it is not sure whether it has been worn, the gap width between the screw and the barrel can be measured. Once the specified tolerance is not met, it should be replaced or repaired. Screw design, especially compression ratio design, plays a role in plasticizing

15

2019/05

SAF Coolest v1.3.1.2 设置面板FZYSD-ZPJT-EAAAE-AZX

图片ALT信息： Qianjiang Jianghan Drilling Tools Co., Ltd.
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