Silencing miner

New continent a (000571, 5.83, 0.87%) shares in AVIC new continent Aviation Manufacturing Co., Ltd., and its large aircraft engine parts are leap engine parts, which are mainly used for Boeing 737max, Airbus a320neo, C919 and other models

AVIC Technology (600391, 22.20, 0.50%) aircraft manufacturing companies are mainly engaged in the main parts of aero-engine and gas turbine; Participate in the development of some parts of C919 engine

aero engine manufacturers (600893, 27.52, 0.40%) participated in the domestic engine being developed by C919

in the morning of February 18, the concept stocks of engine rose sharply, with the trading limits of three stocks of aeroengine control (000738), aeroengine Technology (600391) and aeroengine power (600893). The shares of Steel Research Gaona (300034) surged by more than 8%, Weifu Gaoke (000581) rose by more than 3%, and Zongshen power (001696), Weichai heavy machinery (000880), furuite equipment (300228) also rose slightly

Gangyan Gaona (300034): Gangyan Gaona achieved a total operating revenue of 680 million in the first half of 2019, with a year-on-year growth of 95.6%; The net profit attributable to the parent company was 86.292 million, a year-on-year increase of more than 86%. During the reporting period, the gross profit rate of the company was 33.1%, increased by 5.2 percentage points year on year, and the net profit rate was 15.6%, increased by 1.5 percentage points year on year

as a common stone crusher in modern mining machinery enterprises, it is a kind of equipment with high noise pollution, and its noise problem has always been one of the problems that mining machinery enterprises need to solve

(I) machine failure

machine failure will lead to additional noise generation, such as belt deviation will lead to the sound of proct belt hitting, such as discharging problems, noise generated by excessive stone hitting crusher, noise of machine common vibration caused by machine foundation falling. If there is such noise, the first time to contact technical personnel to solve the problem, to avoid greater losses< (2) rece the noise of sound source

1. Transform the proction process and select low-noise equipment< 2. Improve the machining and assembly accuracy to rece the noise caused by mechanical vibration and friction

3. For high-pressure and high-speed airflow, the pressure difference and velocity should be reced, or the shape of airflow nozzle should be changed
4. Add rubber under the machine and lubricating oil to the machine to rece its own noise. The crusher should add lubricant regularly to protect the machine
5 It should be square above the feeding port) after widening, it can block the sound. The entrance of the crusher can be covered and the noise can be effectively reced< (3) control on the way of communication; 1) reasonable design on the overall layout. When arranging the plane design of the factory and mine, the main noise source workshop or device should be far away from the workshop, laboratory, office, etc. which requires quiet, or the high noise equipment should be concentrated as far as possible for easy control. The terrain and wind direction should be fully considered in the design of the field proction site, and the sound insulation wall can be appropriately added for noise treatment

2. Use additional barriers to prevent noise transmission, or use natural terrain such as hills, slopes, forests, grass or tall buildings that are not afraid of noise, or add structures

3. The directivity of sound source is used to control the noise, such as adopting sound-absorbing cotton and other schemes, such as turning the exhaust ports of high-pressure boiler, blast furnace and oxygen generator towards the field or sky, so as to rece the impact on the environment< (4) protection of the recipients; 1) personal protection for workers, such as wearing earplugs, earmuffs, helmets and other anti noise articles

2. To shorten the working time of workers in high noise environment, workers should work in rotation< (5) other measures.

noise elimination, sound absorption, sound insulation, vibration isolation, vibration rection and other schemes are adopted to deal with the noise
in a word, actively dealing with the noise problem caused by modern instry is not only the problem of safety proction and protection of workers, but also the problem of social conscience of an enterprise.

Ball mill is an essential grinding equipment in the process of mineral processing, which brings economic benefits to the concentrator. Ball mill is mainly used for grinding materials in the instrial proction process. Due to its large volume and heavy tonnage, the noise in the proction process is relatively large, and the noise is generally above 95dB (a), which can exceed 1mdb (a), which is one of the strong noises in the current instrial proction. It seriously affects the physical and mental health of the staff, and the problem of recing the noise of the ball mill needs to be solved urgently

as a common stone crusher in modern mining machinery enterprises, it is a kind of equipment with high noise pollution, and its noise problem has always been one of the problems that mining machinery enterprises need to solve
(1) machine failure
machine failure will lead to additional noise, such as belt deviation will lead to the sound of proct belt hitting, such as discharging problems, noise caused by too much stone hitting crusher, and machine resonance noise caused by machine foundation falling. If there is such noise, the first time to contact technical personnel to solve the problem, to avoid greater losses< (2) rece the noise of sound source
1. Transform the proction process and select low-noise equipment
2. Improve machining and assembly accuracy to rece noise caused by mechanical vibration and friction
3. For high-pressure and high-speed airflow, it is necessary to rece the pressure difference and flow rate, or change the shape of airflow nozzle
4. Add rubber under the machine and lubricating oil to the machine to rece its own noise. The crusher should add lubricant regularly to protect the machine
5 It should be square above the feeding port) after widening, it can block the sound. The entrance of the crusher can be covered and the noise can be effectively reced< (3) control on the way of transmission
1. Reasonable design on the overall layout. When arranging the plane design of the factory and mine, the main noise source workshop or device should be far away from the workshop, laboratory, office, etc. which requires quiet, or the high noise equipment should be concentrated as far as possible for easy control. The terrain and wind direction should be fully considered in the design of the field proction site, and the sound insulation wall can be appropriately added for noise treatment
2. Use additional barriers to prevent noise transmission, or use natural terrain such as hills, slopes, forests, grass or tall buildings that are not afraid of noise, or add structures
3. The directivity of the sound source is used to control the noise, such as adopting sound-absorbing cotton and other schemes, such as turning the exhaust ports of high-pressure boiler, blast furnace and oxygen generator towards the field or sky, so as to rece the impact on the environment
(4) protection for recipients
1. Personal protection for workers, such as wearing earplugs, earmuffs, helmets and other anti noise articles
2. To shorten the working time of workers in high noise environment, workers should work in rotation< (5) other measures
in a word, actively dealing with the noise problem caused by modern instry is not only the problem of safety proction and protection of workers, but also the problem of social conscience of an enterprise.

TPU performance introction

uses: 1. All kinds of mechanical special purpose (PU): Pu polyether seals, membranes, oil seals, etc. with corrosion resistance, hydrolysis resistance and wear resistance

2. General polyurethane board, bar, tube and strip

4. PU; Wheel, forklift wheel, slide wheel, smoke machine wheel, bearing wheel, driving wheel, etc

5; Corrosion resistance, wear resistance, water resistance, methyl alcohol resistant valve lining, seals, couplings,

diaphragm, anechoic layer, floating ball and other procts, can be used as low temperature (- 40 ℃) resistant procts

6. PU for shoe machine: wheel, mold, pressing pad, heel and upper machine hand, which can withstand pressure, impact and compression from 50t to 100t and never change

shape

7. Special for mining machinery (PU): water resistant, alkali resistant, high wear-resistant conveyor pulley, screen, plate, etc

9. Special (PU) accessories for hydraulic press: ush, UNS, DHS, YX, ya, J, polyurethane seal

ring, oil seal king of various specifications

10. Special for electrical appliances (PU): anechoic layer, seal, pneumatic floating ball, etc

Proct characteristics: 1. Wear resistance is 3-5 times of that of general rubber

2. Wide hardness range, shore a60-shore d75

3. Oil resistance, corrosion resistance, solvent resistance, high temperature resistance, aging resistance special materials

4. High tensile strength and tear strength 5. High elasticity, low compression permanent deformation rate

thermoplastic polyurethane elastomer (TPU) is between rubber and plastic, It has many excellent characteristics:

1, excellent wear resistance: its Taber wear value is 0.35-0.5mg, which is the smallest in plastics. Adding lubricant can rece the friction,

and further improve the wear resistance

tube, infusion tube. TPU is widely used in food instry because it is non-toxic and tasteless

I performance characteristics of polyester type TPU

polyester type TPU: it has high mechanical temperature, good wear resistance, oil resistance, fuel resistance and solvent resistance, high temperature performance and excellent

UV linear resistance and hydrolysis stability. Polyester TPU series is recommended for applications with the above requirements

II performance characteristics of polyether TPU:

TPU has low temperature flexibility, good weather resistance, excellent toughness, wear resistance, hydrolysis resistance

and anti microbial properties, which can meet the requirements of maintaining basic performance in cold climate, hydrolysis or mechanical damage environment; Typical applications are in the cable instry: cables that need to be wound, stored and unwinded in extremely harsh weather conditions, cables that need to be dragged in rock areas, cables that need to be dragged in desert or Arctic ice, cables that need to be immersed in water or twisted, bent or roughly treated; It is also an ideal material for seals, watch bands, pipes and profiles

performance and good resilience, so it is suitable for special instries

characteristics: the plastic bar made of TPU material has tensile resistance, strong tensile strength, high tear strength, wear resistance, bending resistance, penetration resistance, low temperature resistance, hydrolysis resistance, good resilience and long service life. This proct does not contain plasticizer, non-toxic and tasteless, is a high

performance environmental protection material. It is the best substitute for PVC and rubber. Type: polyester type TPU, polyether type TPU, polycaprolactone type

TPU

Proct characteristics: TPU has superior mechanical properties, good wear resistance, low temperature resistance, aging resistance, high strength, impact resistance and tear resistance, as well as high elongation and tensile strength. It is non-toxic, environmentally friendly materials, wear resistance (more wear-resistant than POM and nylon)

high softness, quiet, higher elastic molus than rubber with similar hardness, less swelling in solvent and fuel, good weather resistance, no plasticizer