On July 24th, the intensive supervision of the key areas of the Blue Sky Defence War continued in 2018-2019. “China's calcium and magnesium township†was supervised by a number of calcium carbonate enterprises in Jingjing County, Hebei Province . The problem of Hualong Calcium Co., Ltd. was that the open pit mine was not implementation of dust suppression measures to reduce dust, calcium carbonate, Ltd. in North China issue for materials yard dust control measures are not implemented. On July 18th, “Zhongyuan Calcium†Henan Nanzhao County issued an emergency notice for the county to suspend production and rectification, requiring all powder enterprises (calcium powder, colored sand) from the county to stop production since July 23, The powder enterprises proposed by “Looking Back†generally have problems such as open-air stacking of materials, open-air operation of some facilities and equipment, inadequate measures for dust suppression and dust reduction, and serious dust pollution. After comprehensive inspection, production can be resumed. On July 7th, Jiangxi Yongfeng County announced “Resolving the Environmental Pollution Cases of Dozens of Carbonate Nano Calcium Plants in Yongfeng Countyâ€. Seven carbonated nano-calcium enterprises in Yongfeng County have different levels of dust and unorganized emissions. The big phenomenon, among which 4 companies have problems with open storage of raw materials or residues. On June 25th, Xianyang City , Shaanxi Province announced the “Special Inspection of Air Pollution Control in Guanzhong Area, Xianyang City Feedback Question List (Second Batch)â€. The problem of Yongshou County Golden Calcium Carbonate Factory is: the road between the south gate of the factory and the raw material warehouse. The dust is serious. On May 22, Jiangxi Province Shangrao City Shuyang County Hongyu Calcium Carbonate Co., Ltd. was reported: only a hundred meters away from the residential area, the 24-hour start-up noise is very harsh; years of dumping industrial waste, wastewater directly draining the river, seriously polluting the local environment, It is extremely harmful to the local environment, and it is hoped that the relevant departments will shut down the enterprise as soon as possible. In summary, the current problems of calcium carbonate enterprises that make the environmental protection inspection team and the people unsatisfied mainly include the following aspects: Dust pollution problems in open pit mines; Open storage problems such as raw ore, auxiliary materials and waste residue; Dust pollution problems in production processes such as crushing, grinding, carbonization, modification, packaging, and storage; Noise pollution problems in production equipment such as crushing, grinding and modification. So, how can calcium carbonate producers improve on the above issues? 1. Open-pit mining dust control measures The main measures for comprehensive dust prevention in open pit mines are dusting, containment-ventilation-dusting and sprinkling to suppress dust. (1) The punching operation is dustproof. The perforation operation mainly takes wet work. Large-scale rock drills can also use dust-collecting devices to remove dust. Dust generated by shovel-loaded ore can be dust-removed by means of precipitation and dust prevention. (2) Dust removal by the crusher. The crusher can be dust-removed by means of a closed-ventilation-dust removal method. Due to the simplicity of the process and the high degree of mechanization, remote control can be used to further reduce and eliminate the opportunity for workers to come into contact with dust. (3) Transportation and dust removal. Vehicle dust during open-air mine transportation is the main source of dust in open pit mines. The main measures for transporting dust are as follows: Sprinkle water on the rock before loading, and set up a spray device at the unloading site to reduce dust. Strengthen road maintenance and reduce mines during vehicle transportation. The main transportation roads in the mining area use asphalt or concrete pavement. A mechanical sprinkler is often used to sprinkle water on the road or add a wetting agent to the water to improve the dustproof effect. It can also be sprayed with a dust suppressor to reduce dust. The main components of the dust suppressant are tracer and polymer binder, which can not only form a dustproof layer but also improve the quality of the road surface. 2, calcium carbonate production dust control measures (1) Process modification Reforming production processes, production tends to be mechanized, automated and sealed. If manual sorting is changed to color sorter picking. (2) Indoor stacking Raw ore, auxiliary materials, waste residue, etc. are all covered or stored indoors, and equipment such as spray dust suppression is installed. (3) Ventilation and dust removal measures Install a hood at the dust source, install a ventilation system, such as coarse crushing bag dust removal, the whole machine is sealed, and the suction hood is packaged; choose a suitable dust collector according to different equipments of the enterprise, such as bag dust collector and wet dust collector. And cyclone dust collectors can effectively collect dust and reduce workplace pollution. E.g: The lime kiln kiln is subjected to cyclone dust removal, water film dust removal, water and gas separation, and then enters the carbonization tower for carbonization reaction. After the reaction, the tail gas is discharged through the 15 m chimney; The flue gas generated by the hot blast stove is discharged by a 15m exhaust pipe after gravity sedimentation and cyclone water film dedusting and desulfurization treatment; The boiler flue gas is discharged through a 20 m chimney after cyclone dust removal and two-stage water film dedusting treatment; The crushing, grinding and sieving, packaging dust, etc. are respectively discharged by a pulse bag dust removing device and discharged through a 15 m high exhaust pipe. (4) Sealing operation The production operating environment and each discharge port can be completely sealed. To transport and transport calcium carbonate powder by conveyor belt, closed conveying should be adopted to minimize the height difference at the position of blanking, and the roller blind should be installed on the belt head to reduce the dust when falling. Calcium carbonate coarse powder handling should be mechanized as much as possible, and the material separation device should be sealed to avoid leakage. For example, the mechanical shaft kiln production process fully implements automatic cloth, automatic discharge and closed blast, and kiln front closure to reduce dust emissions in all directions. (5) Wet operation In the actual production process, the raw ore before entering the crusher is humidified, such as adding spraying equipment above the crusher, which can effectively reduce the amount of dust generated by the ore during the crushing process. Timely replacement of the blunt tooth plate, when the tooth is blunt, it will increase the contact area with the ore, forming a large pressure-fixing core, and causing a large amount of dust. After coarse crushing, try to use wet dust suppression and spray dust reduction measures. The wet crushing wastewater, the dust removing water and the ground washing water are respectively recycled through the sedimentation tank and then recycled. 3. Noise prevention and control measures (1) Isolation of equipment in the sections of crushing, grinding, carbonization, modification, etc., and installation of muffler to drive noise out of the building. (2) In workplaces where the noise intensity exceeds 85 dB (A), earplugs should be provided for workers. In the working environment with noise intensity greater than 104.8dB(A) (such as near crusher, ball mill, vertical mill, etc.), only wearing the existing anti-noise earplugs can not meet the protection requirements, and the earplugs are required to be worn together. (3) Minimize the working time of contact noise, reduce the working time in the vicinity of high-noise equipment, and adopt the rotation system if necessary. 4, factory appearance The roads in the plant area are hardened, and the plant area and its surrounding areas are greened. Especially in the greening of production areas, it is necessary to select the tree species that have strong resistance to dust, good adsorption and sound insulation. For workshops with strong noise, it is advisable to choose shrubs with dense foliage, short crowns and low branching points.
The UCF pillow block mounted bearing series has four bolt holes, and a set screw lock is designed for mounting onto bearing surfaces parallel to the shaft axis, such as conveyor belts. This ready-to-mount unit has solid base cast iron housing, chrome steel bearings, and is designed for efficient operation at a wide range of speeds. This one-piece pillow block housing allows for a stationary outer ring and rotating inner ring. Insert bearing maintains the separation between moving parts to reduce rotational friction, and to support radial and axial loads. The bearing is secured to the shaft with set screws to prevent slippage. This mounted bearing is used in food and beverage manufacturing, textile industry and many other industrial manufacturing.
Pillow blocks are usually referred to the housings which have a bearing fitted into them & thus the user need not purchase the bearings separately. Pillow blocks are usually mounted in cleaner environments & generally are meant for lesser loads of general industry. These differ from "plummer blocks" which are bearing housings supplied without any bearings & are usually meant for higher load ratings & corrosive industrial environments. However the terms pillow-block & plummer-block are used interchangeably in certain parts of the world. Ucf Pillow Bearing,Ucf Pillow Block Bearing,Ucf 207 Flange Bearing,Flange Mounted Pillow Block Bearing Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearing.com
However fundamental application of both types is the same which is to primarily mount bearings safely enabling their outer ring to be stationary while allowing rotation of the inner ring. The housing is bolted to a foundation through the holes in the base. Bearing housings are either split type or unsplit type. Split type housings are usually two piece housings where the cap and base can be detached. While certain series are one single piece housings. Various seals are provided to prevent dust and other contaminants from entering the housing. Thus the housing provides a clean environment for the expensive bearings to freely rotate hence increasing their performance and duty cycle.
Bearing housings are usually made of grey cast iron. However various different grades of metals can be used to manufacture the same.
Recently, many calcium carbonate enterprises in the country have been supervised by the environmental protection group, and there are various problems: