Conveyor dynamic analysis of the most important feature is the change in the previous study each component individually designed patterns to various components of the conveyor the best way to work together for the ultimate goal, the Belt Conveyor as an organic whole to conduct a comprehensive analysis, find the optimal combination of model and control strategy in the economic, reliable conditions, to improve the overall performance of the conveyor.
Dynamic analysis in modern belt conveyor design to solve the main problem between the following aspects:
(1) Calculate the transport conveyor driven in operation of the peak value and the tension condition occurs. Conveyor drive tension peak is generally several times its normal operating tension or even ten times, and according to the way the previous static design tension value calculated is much smaller than the actual value, we can only increase the safety factor to ensure delivery safe operation of the machine. In the absence of reliable analytical tool in the case, the use of empirical methods to determine the factor of safety is often made too large, it will inevitably result in increased costs, waste of investment.
(2) analysis of the vibration conveyor belt running it special law. Vibration is causing tension increase was mainly driven conveyor, belt accident is caused by the culprit, find out the rules for the effective control of its dynamic tension the belt of great significance.
(3) study the boundary conditions on the conveyor belt vibration regulation impact. Boundary conditions conveyor belt means all affect the dynamic characteristics of internal conditions and external conditions, such as driving, tensioning devices, roller, load and so on. To analyze the changes of these boundary conditions on the vibration impact and vibration conveyor find optimal hop's best special form of the boundary conditions.
(4) the boundary conditions optimized working conveyor through dynamic analysis to determine the best configuration for transport subsystem.
(5) based on comprehensive analysis of the results of the evaluation, selection and reasonable belt conveyor structure and configuration, so that in performance and comprehensive economic indicators optimal.
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2013年10月28日星期一
Controllable Starting conveyor technology
With the Belt Conveyor, the traditional motor direct start or combined starter motor and coupler has far can not meet the requirements. Long distance, high speed belt conveyor as the starting load is large, and the operating speed is higher, it must be controlled during start, the speed curve starting at the best smooth start, the starting time, starting acceleration control within the allowable range .
According to China's relevant standards, starting acceleration shall not exceed 0.3 s, in order to reduce the dynamic load and instantaneous shock, conveyor belts and other meta while avoiding damage to components. Carried out abroad, a lot of research work, developed a corresponding controllable starting device, such as: frequency control devices, differential gear train viscous speeder, hydraulic speed control devices.
According to China's relevant standards, starting acceleration shall not exceed 0.3 s, in order to reduce the dynamic load and instantaneous shock, conveyor belts and other meta while avoiding damage to components. Carried out abroad, a lot of research work, developed a corresponding controllable starting device, such as: frequency control devices, differential gear train viscous speeder, hydraulic speed control devices.
2013年10月25日星期五
Some affect the efficiency of the screw conveyor conveying the main factors
Several impact Screw Conveyor transport efficiency main factors:
1 material viscosity , easy caking. Viscous material , the material is easy to stick to the screw conveyor blades and the inner wall , making the material handling process resistance increases directly affect production efficiency.
2 spiral diameter . Screw diameter also affects the size of the transport efficiency . Under the same conditions , diameter larger than the diameter conveyors efficient small throughput and transmission efficiency is high .
3 inclination of the screw conveyor and transmission distance.
4 . Material size , temperature, moisture , abrasive and corrosive . Specific parameters can refer to: Screw technical parameters and throughput formula.
5 screw conveyor speed . Related to the conveying motor power size. Screw conveyor operating speed on the characteristics of the material are closely related , high- speed conveyor assembly demanding the production of , and better balance . The following table has four kinds of speed choice, in fact, more conservative, especially in large, medium size , speed is low , resulting in greater waste. Recommended in the selection table to take a higher speed, better transportation efficiency .
Screw conveyor is a more extensive use of transportation equipment , usually used for small pieces of powder or granular materials transportation . For different materials , the choice of model is not the same . General requirements for the food industry are mostly stainless steel screw conveyor , the more stringent requirements of the material for other industries according to need. For some materials with twining , more choice of shaftless screw conveyor , this type of conveyor can effectively reduce the material wound on the spindle case , greater throughput .
1 material viscosity , easy caking. Viscous material , the material is easy to stick to the screw conveyor blades and the inner wall , making the material handling process resistance increases directly affect production efficiency.
2 spiral diameter . Screw diameter also affects the size of the transport efficiency . Under the same conditions , diameter larger than the diameter conveyors efficient small throughput and transmission efficiency is high .
3 inclination of the screw conveyor and transmission distance.
4 . Material size , temperature, moisture , abrasive and corrosive . Specific parameters can refer to: Screw technical parameters and throughput formula.
5 screw conveyor speed . Related to the conveying motor power size. Screw conveyor operating speed on the characteristics of the material are closely related , high- speed conveyor assembly demanding the production of , and better balance . The following table has four kinds of speed choice, in fact, more conservative, especially in large, medium size , speed is low , resulting in greater waste. Recommended in the selection table to take a higher speed, better transportation efficiency .
Screw conveyor is a more extensive use of transportation equipment , usually used for small pieces of powder or granular materials transportation . For different materials , the choice of model is not the same . General requirements for the food industry are mostly stainless steel screw conveyor , the more stringent requirements of the material for other industries according to need. For some materials with twining , more choice of shaftless screw conveyor , this type of conveyor can effectively reduce the material wound on the spindle case , greater throughput .
The performance characteristics of weightless paddle mixer
1 , the machine constant reverse rotation shaft through two special arrangement of blades , the material for the radial , circumferential and axial direction , and form the combined cycle , in a very short time to achieve uniform mixing .
2 , can be solid ( powder ) - solid ( powder ) ( particle size 20-2500 mesh ) mixed .
3 , according to user requirements , plus you can also spray and collet assembly to make it available as a solid ( powder ) - liquid ( liquid content < 15 %) of the mixing and drying equipment.
4 , the specific gravity , particle size greater difference in physical properties such as material mixing does not produce deflection , resulting in very uniform mixture.
5 , mixed precision , solid - solid mixed in 1: 1000 ratio , the standard deviation of three hundred thousandths ~ eight , content fluctuation error < 2% ( variance factor ) .
6, the Paddle Mixer speed , generally only ten minutes powder mixing .
7 , low energy consumption , a general mixer for 1/ 4 to 1 / 10 .
8, closed operation, balanced and reliable operation , easy maintenance.
9 , manual, electric , pneumatic material way for you to choose .
2 , can be solid ( powder ) - solid ( powder ) ( particle size 20-2500 mesh ) mixed .
3 , according to user requirements , plus you can also spray and collet assembly to make it available as a solid ( powder ) - liquid ( liquid content < 15 %) of the mixing and drying equipment.
4 , the specific gravity , particle size greater difference in physical properties such as material mixing does not produce deflection , resulting in very uniform mixture.
5 , mixed precision , solid - solid mixed in 1: 1000 ratio , the standard deviation of three hundred thousandths ~ eight , content fluctuation error < 2% ( variance factor ) .
6, the Paddle Mixer speed , generally only ten minutes powder mixing .
7 , low energy consumption , a general mixer for 1/ 4 to 1 / 10 .
8, closed operation, balanced and reliable operation , easy maintenance.
9 , manual, electric , pneumatic material way for you to choose .
2013年10月22日星期二
Flour machine classification
Flour Machinery can be divided into different categories to different requirements . There are about several points system .
According to the number of how much flour machine
Flour can be divided into single , double and multiple sets of flour machine flour machine ( ie flour units ) .
According to the size of the volume of flour machine
Flour machine can be divided into small , medium and large flour flour crew crew .
Flour machine technology advanced by
Can be divided into the traditional flour mill ( grinding flour mixed skin-core machine ) and modern flour mill ( skin-core separation flour machine ) .
Traditional flour machine ( skin-core mix flour mill machine ) including stone flour mill machines and conventional steel flour machine , this machine in the processing of Wheat Flour Mixer , the milled mixture does not separate the skin-core but directly re- grinding so resulting in a relatively dark flour .
Modern flour machine ( skin-core separator flour mill ) in the processing of wheat , the milled mixture through skin-core round sieve filtration to separate the skin and the core , and then peel and core separately grinding. Such was milled flour whiter .
According to the number of how much flour machine
Flour can be divided into single , double and multiple sets of flour machine flour machine ( ie flour units ) .
According to the size of the volume of flour machine
Flour machine can be divided into small , medium and large flour flour crew crew .
Flour machine technology advanced by
Can be divided into the traditional flour mill ( grinding flour mixed skin-core machine ) and modern flour mill ( skin-core separation flour machine ) .
Traditional flour machine ( skin-core mix flour mill machine ) including stone flour mill machines and conventional steel flour machine , this machine in the processing of Wheat Flour Mixer , the milled mixture does not separate the skin-core but directly re- grinding so resulting in a relatively dark flour .
Modern flour machine ( skin-core separator flour mill ) in the processing of wheat , the milled mixture through skin-core round sieve filtration to separate the skin and the core , and then peel and core separately grinding. Such was milled flour whiter .
Flour machine composition
flour mill machinery generally consists of milling and sifting two parts, namely, grinding and Yuan Luo .
Grinding works
Portions of flour with a tapered roller teeth two involved the diminishing food grinding mouth produces extrusion, because two roller speed is not the same speed , so that grain grinding force arising broken into powder , crushed into a powder grain flow sieve processing section - Yuan Luo .
Yuan Luo works
Mixing fan is rotatably thrown silk screen inflows come forward to make the mouth , to the back of slag taphole . Further processing, so in cycles , can achieve any desired flour yield .
Grinding works
Portions of flour with a tapered roller teeth two involved the diminishing food grinding mouth produces extrusion, because two roller speed is not the same speed , so that grain grinding force arising broken into powder , crushed into a powder grain flow sieve processing section - Yuan Luo .
Yuan Luo works
Mixing fan is rotatably thrown silk screen inflows come forward to make the mouth , to the back of slag taphole . Further processing, so in cycles , can achieve any desired flour yield .
2013年10月16日星期三
Bucket elevator modification to the attention of those matters it
In the Bucket Elevator machine head equipped with anti-reversing device. In the bucket elevator suddenly interrupted when the work force, reversing the bucket elevator is very dangerous. Bucket elevator in the promotion process, the upstream side is filled with material bucket, the other side is emptied of material down an empty bucket. Power failure, the bucket elevator reversal will occur due to gravity.
With the inverted bucket material is unloaded into the bottom of the bucket elevator until after the jam filled bucket. Since inversion is an accelerated movement, and then was suddenly stuck easily ripped off bucket, so that the belt is damaged, or even broken. Also the bottom of the bucket elevator filled with materials, but also the bucket elevator can not start, usually anti-reverse ratchet mechanism.
2 in the bucket elevator shall be provided at the bottom of the head and suction tubes and vents to ensure bucket elevators and feed in the discharge process will not form a negative pressure and dust spills. A well-made transportation equipment, it must be reliable sealing. But good sealing of the material during discharge and the feed pressure difference is bound, resulting in difficulties in feeding and unloading. Vents inside the bucket elevator substantially equal pressure and external pressure, adequate suction to avoid dust from the ventilation overflow, avoiding waste and clean environment.
Bucket elevator for conveying, such as powder, granular and non-small and small abrasives Information: coal, cement, stone, sand, clay, ore, etc., as is traction hoist chain, allowing the transmission high-temperature materials. The hoist has a traffic volume increase, stable and reliable operation, long life, significant advantages.
With the inverted bucket material is unloaded into the bottom of the bucket elevator until after the jam filled bucket. Since inversion is an accelerated movement, and then was suddenly stuck easily ripped off bucket, so that the belt is damaged, or even broken. Also the bottom of the bucket elevator filled with materials, but also the bucket elevator can not start, usually anti-reverse ratchet mechanism.
2 in the bucket elevator shall be provided at the bottom of the head and suction tubes and vents to ensure bucket elevators and feed in the discharge process will not form a negative pressure and dust spills. A well-made transportation equipment, it must be reliable sealing. But good sealing of the material during discharge and the feed pressure difference is bound, resulting in difficulties in feeding and unloading. Vents inside the bucket elevator substantially equal pressure and external pressure, adequate suction to avoid dust from the ventilation overflow, avoiding waste and clean environment.
Bucket elevator for conveying, such as powder, granular and non-small and small abrasives Information: coal, cement, stone, sand, clay, ore, etc., as is traction hoist chain, allowing the transmission high-temperature materials. The hoist has a traffic volume increase, stable and reliable operation, long life, significant advantages.
Bucket elevator are some considerations
The use of bucket elevator maintenance considerations, should pay attention to the correct procedure standard operating behavior and aggressive hoist do routine maintenance work
1, Bucket Elevator should be empty load driving. So every time before shutdown drained all the material inside the hopper, and then stop.
2, can not be reversed. Rewind chain derailment phenomenon that is likely to occur, excluding derailment failure is very troublesome.
3, uniform feeding. Sudden increase in the volume of feed ban. Feeding amount can not exceed the hoist transmission capacity. Or likely to cause serious bottom material buildup occurs when "boring car" accident.
4, in a timely manner appropriate to add oil.
5, bucket elevator chain and hopper badly worn or damaged should be replaced.
Operating equipment operation found a problem, you should make a record, to be eliminated overhaul.
Emphasize that the elevator is running, do not allow the moving parts for cleaning and repair.
Bucket elevators used in the operation, the operator should be fixed, and must formulate strict shift system. Material characteristics, working conditions, throughput, etc. shall meet the design requirements, regular maintenance lubrication and maintenance hoist.
1, Bucket Elevator should be empty load driving. So every time before shutdown drained all the material inside the hopper, and then stop.
2, can not be reversed. Rewind chain derailment phenomenon that is likely to occur, excluding derailment failure is very troublesome.
3, uniform feeding. Sudden increase in the volume of feed ban. Feeding amount can not exceed the hoist transmission capacity. Or likely to cause serious bottom material buildup occurs when "boring car" accident.
4, in a timely manner appropriate to add oil.
5, bucket elevator chain and hopper badly worn or damaged should be replaced.
Operating equipment operation found a problem, you should make a record, to be eliminated overhaul.
Emphasize that the elevator is running, do not allow the moving parts for cleaning and repair.
Bucket elevators used in the operation, the operator should be fixed, and must formulate strict shift system. Material characteristics, working conditions, throughput, etc. shall meet the design requirements, regular maintenance lubrication and maintenance hoist.
2013年10月9日星期三
Belt conveyor installation technical requirements
1 Subject Matter and Scope
Standard Rules on the Belt Conveyor of the belt conveyor ( hereinafter referred to as belt conveyors ) in the drawing , production, equipment , use, maintenance and other aspects of the basic security needs.
This standard applies to the delivery of all kinds of massive , granular materials and other loose items into a belt conveyor.
For transportation of flammable , explosive, toxic, corrosive , radioactive and other materials in addition to abide by the belt conveyor should abide by the standards appropriate for the safety standards.
2 citation standard GB4064 electrical equipment safety guidelines GB10595 depicting belt conveyor belt skills condition GBJ232 Electrical Equipment for construction and inspection standards
Three general rule
3.1 workpiece Screw conveyor under normal conditions should be satisfied with the stability and strength.
3.2 Electrical equipment necessary to fit the device depicted GB4064 and GBJ232 rules.
3.3 depicts or production units without approval, the user should not be affected belt conveyor original drawing , production, equipment safety needs change.
3.4 Belt conveyor is necessary according to the material properties and the amount of demand for transport use , not overloaded use , it is necessary to avoid congestion and overflow , adhere transporting dredge .
a. Conveyor belt should fit specific load and transport properties of materials to meet the width ;
b. Belt conveyor inclination portrayed as necessary to avoid the material in the slip under normal operating conditions or rolled ;
c. Belt conveyors should be set to ensure uniform feeding manipulation device ;
d. Hopper or chute wall slope , orientation and scale of the discharge port is necessary to be able to ensure that the material automatically by gravity flow ;
e. By the feed point should be located in the horizontal section , and set the guide plate . Necessary by the feed point located in the skew segment, assisted loading equipment to be located ;
f. Tensioning device should be installed straight section blanking plate ;
g. Feed point should fall by impact of the approach adopted .
3.5 transporting viscous material , the drum looks, backhaul segment should be set with a surface adapted to cleaning equipment . Skew segment conveyor belt tail pulley block material should be set before the scraper . Eliminating all of which can lead to the risk of delivery with a deviation .
3.6 diagonal belt conveyors should be installed to avoid speeding or reversing safety equipment. This device is the power to intercept or rendering problems when the maintenance of effect .
3.7 on the conveyor belt moving some of either manual or self-propelled stopper should be installed after parking device.
3.8 prohibits officers from no special lanes across the conveyor belt or from below through .
3.9 across the conveyor belt above the work platform or channel shall be installed to avoid material fall protection equipment .
3.10 bolt convergence necessary skills requirements by depicting disposal , and use special tools to tighten.
3.11 belt conveyor parts are often easy to pinch someone near to protective measures should be strengthened .
3.11.1 belt conveyor head . Tail and tensioning device redirection site site and the adjacent two folding rollers turn off when at beyond 3 °
Standard Rules on the Belt Conveyor of the belt conveyor ( hereinafter referred to as belt conveyors ) in the drawing , production, equipment , use, maintenance and other aspects of the basic security needs.
This standard applies to the delivery of all kinds of massive , granular materials and other loose items into a belt conveyor.
For transportation of flammable , explosive, toxic, corrosive , radioactive and other materials in addition to abide by the belt conveyor should abide by the standards appropriate for the safety standards.
2 citation standard GB4064 electrical equipment safety guidelines GB10595 depicting belt conveyor belt skills condition GBJ232 Electrical Equipment for construction and inspection standards
Three general rule
3.1 workpiece Screw conveyor under normal conditions should be satisfied with the stability and strength.
3.2 Electrical equipment necessary to fit the device depicted GB4064 and GBJ232 rules.
3.3 depicts or production units without approval, the user should not be affected belt conveyor original drawing , production, equipment safety needs change.
3.4 Belt conveyor is necessary according to the material properties and the amount of demand for transport use , not overloaded use , it is necessary to avoid congestion and overflow , adhere transporting dredge .
a. Conveyor belt should fit specific load and transport properties of materials to meet the width ;
b. Belt conveyor inclination portrayed as necessary to avoid the material in the slip under normal operating conditions or rolled ;
c. Belt conveyors should be set to ensure uniform feeding manipulation device ;
d. Hopper or chute wall slope , orientation and scale of the discharge port is necessary to be able to ensure that the material automatically by gravity flow ;
e. By the feed point should be located in the horizontal section , and set the guide plate . Necessary by the feed point located in the skew segment, assisted loading equipment to be located ;
f. Tensioning device should be installed straight section blanking plate ;
g. Feed point should fall by impact of the approach adopted .
3.5 transporting viscous material , the drum looks, backhaul segment should be set with a surface adapted to cleaning equipment . Skew segment conveyor belt tail pulley block material should be set before the scraper . Eliminating all of which can lead to the risk of delivery with a deviation .
3.6 diagonal belt conveyors should be installed to avoid speeding or reversing safety equipment. This device is the power to intercept or rendering problems when the maintenance of effect .
3.7 on the conveyor belt moving some of either manual or self-propelled stopper should be installed after parking device.
3.8 prohibits officers from no special lanes across the conveyor belt or from below through .
3.9 across the conveyor belt above the work platform or channel shall be installed to avoid material fall protection equipment .
3.10 bolt convergence necessary skills requirements by depicting disposal , and use special tools to tighten.
3.11 belt conveyor parts are often easy to pinch someone near to protective measures should be strengthened .
3.11.1 belt conveyor head . Tail and tensioning device redirection site site and the adjacent two folding rollers turn off when at beyond 3 °
What procedures belt
1, the stationary Belt Conveyor device means the device should be the rule in a fixed basis. Mobile conveyor before officially running wheels should live with a triangular or wedge brakes stopped . Avoid walking in the attack , more than one conveyor parallel operation, the machine and the machine between the machine and the wall should be between one meter channel.
2, the Screw conveyor shall examine each application before work somewhat , tape hasp and load device is not a normal , protective equipment is not completely . Tape tension must be adjusted before launching into the appropriate level.
3 , belt conveyors should be unloaded start. Such as working properly before feeding . After the first car to stop feeding .
4 , rare sets conveyor tandem operation, should be the beginning of the discharge end , the sequence starts. Full work only after the feeding . 5 , showing the tape operation deviation representation should adjust parking not far-fetched to use , to avoid wear and tear of marginal and add load.
6 , the working environment and sent the material temperature not higher than 50 ℃ and below -10 ℃.
7 , transporting belt stop for pedestrians or by people .
8 , it is necessary to suspend parking before feeding, unloading and other material on the belt to make deposits before parking .
9 , conveyor motors have outstanding insulation is necessary . Mobile conveyor cables do not Luanla and dragging . Motor to solid ground .
10 , prohibit the belt slipping a hand to pull the belt , to avoid seizures trouble.
2, the Screw conveyor shall examine each application before work somewhat , tape hasp and load device is not a normal , protective equipment is not completely . Tape tension must be adjusted before launching into the appropriate level.
3 , belt conveyors should be unloaded start. Such as working properly before feeding . After the first car to stop feeding .
4 , rare sets conveyor tandem operation, should be the beginning of the discharge end , the sequence starts. Full work only after the feeding . 5 , showing the tape operation deviation representation should adjust parking not far-fetched to use , to avoid wear and tear of marginal and add load.
6 , the working environment and sent the material temperature not higher than 50 ℃ and below -10 ℃.
7 , transporting belt stop for pedestrians or by people .
8 , it is necessary to suspend parking before feeding, unloading and other material on the belt to make deposits before parking .
9 , conveyor motors have outstanding insulation is necessary . Mobile conveyor cables do not Luanla and dragging . Motor to solid ground .
10 , prohibit the belt slipping a hand to pull the belt , to avoid seizures trouble.
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