With the market for its increasing emphasis on the development of the machinery industry, for machinery production operations are also getting support, in order to better reflect the effect of the operation of machinery and equipment, already on the market developed more products, each product is new machinery and equipment products are designed to be able to make a better mechanical equipment operating personnel to assist them so that their work can also reduce the burden, so that manual single girder suspension
hoist crane is better , then it is mainly what role?
1 speed
Today on manual single girder suspension crane operation speed of the process is relatively fast, on this point who used such products people are such a kind of feedback, indicating that the current manual single girder suspension
overhead bridge crane is better quality , and has an excellent performance, which is more satisfactory place, so in the course of its operation is often the faster, the faster the product is the more promising, so that it is are more useful.
2 Simple operation
Today in the market manual single girder suspension crane is a mechanical device more popular products, because when the operator when used in its feeling is very simple, because it is relatively simple to operate, there is nothing complex functions , not too professional, most people will use it.
This is the manual single girder suspension
bridge gantry crane in the market, the role played.
santo gantry crane
2013年9月8日星期日
The method of choosing an electric crane hoisted What?
Select electric suspension
gantry crane is there are many, and is now in the process of using them often will notice the quality of electric overhead crane, and in ensuring quality problem is not a big problem under the premise can be use, and generally like the same kind of product is more useful, so now people are more like them, then when the electric machinery enterprises in the choice of crane hoisted what way to do it?
1.Brand
Typically, in the choice of machinery products in the process is the need to look at their product brand image, often a lot of plastic products, established brand image is not very good, so people in the choice of the time its not very satisfied with the choice, in fact the difficulty is relatively large, when the electric overhead crane products gradually increased, the customer is also a troublesome thing, in the course of its production brand is more critical, so when choosing an electric overhead bridge gantry crane brand is more important.
(2) the role of
As this electric crane hoisted it on the market must have a significant role, and in the process used to carry out the role which can well be reflected, this role is the ability to be a good show out , so in the process of choosing an electric bridge crane is important to note these.
1.Brand
Typically, in the choice of machinery products in the process is the need to look at their product brand image, often a lot of plastic products, established brand image is not very good, so people in the choice of the time its not very satisfied with the choice, in fact the difficulty is relatively large, when the electric overhead crane products gradually increased, the customer is also a troublesome thing, in the course of its production brand is more critical, so when choosing an electric overhead bridge gantry crane brand is more important.
(2) the role of
As this electric crane hoisted it on the market must have a significant role, and in the process used to carry out the role which can well be reflected, this role is the ability to be a good show out , so in the process of choosing an electric bridge crane is important to note these.
For the use of electric overhead traveling crane pay attention to what?
Electric
bridge gantry crane hoisted on the market today is a relatively high-quality mechanical products, this product on the market is relatively good, because its use is more widespread, and people are more favorable impression of their, like this products on the market is more promising in the development process is often noticed electric crane hoisted a lot of problems, as long as is necessary to immediately find problems to solve, it is more appropriate way to handle it is now suspended for the electric the use of cranes need to pay attention to?
1 species
First, to carry out the production process is often more focus on product variety issues, because every business that requires the use of a variety of products is not the same, always have something different, be used in the course of its operation personnel for electric overhead gantry crane species are more understanding and familiarity, so do not ask what they need to know the type of electric overhead crane, what size, etc., which are needed before a clear understanding of its use.
2 image
Is now on the market are required to be a better image of the product, the general image and enterprises are necessarily linked, in its long-term for the image of the process of development is often the most important, whether the product is also well, for businesses both mean need a certain image.
This is the use of electric overhead jib crane when needed attention.
1 species
First, to carry out the production process is often more focus on product variety issues, because every business that requires the use of a variety of products is not the same, always have something different, be used in the course of its operation personnel for electric overhead gantry crane species are more understanding and familiarity, so do not ask what they need to know the type of electric overhead crane, what size, etc., which are needed before a clear understanding of its use.
2 image
Is now on the market are required to be a better image of the product, the general image and enterprises are necessarily linked, in its long-term for the image of the process of development is often the most important, whether the product is also well, for businesses both mean need a certain image.
This is the use of electric overhead jib crane when needed attention.
The market for the development of electric crane hoisted What?
Nowadays there are many products on the market is relatively good, because every product on the market developments are relatively hard, and more efforts to develop products on the market the more attractive, so its production the process of the electric overhead traveling
hoist crane is more optimistic, and now on the market for electric overhead crane is more concerned about the development, and even some of the machinery is quite confident of its business, and I hope it is getting better and better development, so now on the market for its analysis of the development of electric crane hoisted What are the main?
1 Talent
Today, when the manufacturers in their production of electric overhead crane when the most important thing is to rely on the power of talent condensed because of the strength of cohesion is relatively large, a development of enterprises in the process of talent is the most need to have the If no talent then the company or the manufacturer of the product is difficult to produce, which explains professionals or the use of an electric hoist gantry crane , but in the selection process of the professionals is the need cautious.
(2) Equipment
When the electric overhead traveling crane manufacturers in the process of its production equipment is often more crucial thing, because electric crane hoisted on the market is a kind of relatively easy to use products, so for the time of its production equipment is relatively there is a demand.
This is the market for the development of electric eot crane hoisted the approximate analysis done.
1 Talent
Today, when the manufacturers in their production of electric overhead crane when the most important thing is to rely on the power of talent condensed because of the strength of cohesion is relatively large, a development of enterprises in the process of talent is the most need to have the If no talent then the company or the manufacturer of the product is difficult to produce, which explains professionals or the use of an electric hoist gantry crane , but in the selection process of the professionals is the need cautious.
(2) Equipment
When the electric overhead traveling crane manufacturers in the process of its production equipment is often more crucial thing, because electric crane hoisted on the market is a kind of relatively easy to use products, so for the time of its production equipment is relatively there is a demand.
This is the market for the development of electric eot crane hoisted the approximate analysis done.
Select electric single-girder cranes which elements
There are many products in the course of its production is more important, because there are a lot of products in its production when it is paying more attention to quality issues, and in the course of its production is more able to be used , and under normal circumstances in the selection process of electric single girder
overhead gantry crane is relatively a lot of problems need to pay attention, because the choice for mechanical products is relatively little need to be careful, now select electric single-girder crane when there are elements which it?
1.Model
Now, with the enterprises for the electric single-girder crane growing demand, the choice of electric single-girder crane in the process have noted the problem is more and more, in general, when the choice is more important model, different varieties reflected the product model is different, a comparison of product variety is the more upscale models with the more difficult, but not to say that with less, and now electric single-girder bridge gantry crane models have been more and more, this is their choice for businesses addition of the probability of a lot.
2 Specifications
In its selection process specifications for the product is more important to note, the product specification is more important, especially in the selection process of the product machine is more need to be careful, careful consideration in choosing an electric single girder crane in the process is more important.
This is in the choice of electric single-girder overhead bridge crane several elements that need attention.
1.Model
Now, with the enterprises for the electric single-girder crane growing demand, the choice of electric single-girder crane in the process have noted the problem is more and more, in general, when the choice is more important model, different varieties reflected the product model is different, a comparison of product variety is the more upscale models with the more difficult, but not to say that with less, and now electric single-girder bridge gantry crane models have been more and more, this is their choice for businesses addition of the probability of a lot.
2 Specifications
In its selection process specifications for the product is more important to note, the product specification is more important, especially in the selection process of the product machine is more need to be careful, careful consideration in choosing an electric single girder crane in the process is more important.
This is in the choice of electric single-girder overhead bridge crane several elements that need attention.
Electric double beam crane how developed?
Now on the market role of the electric double girder
Steel crane is relatively large, it uses a dual beam material, generally single beam, so it is a little bit special products for this product is relatively in need because such products on the market is relatively rare, so use them when are generally more careful, because extend the life of the other, which is quite good, and now electric double girder crane is mainly how developed it?
1 Product Updates
When the electric double girder crane in the process of development is the need to constantly update their products, and only in its case constantly updated in order to better display quality products in its production process often products is relatively high, and now he's more concerned about the development of the market, but also have a lot of machinery is relatively optimistic about its business in the development process of their continued support and help, and product updates only a part.
(2) quality assurance
Now, with the electric double girder bridge crane continues to develop, in terms of quality has Nana fill a good guarantee, as long as there are points to ensure users will use them more confidence, which is the product during development process a little more attention, but in terms of quality is more valued.
This is the electric double girder hoist gantry crane on the market gradually developed factor.
1 Product Updates
When the electric double girder crane in the process of development is the need to constantly update their products, and only in its case constantly updated in order to better display quality products in its production process often products is relatively high, and now he's more concerned about the development of the market, but also have a lot of machinery is relatively optimistic about its business in the development process of their continued support and help, and product updates only a part.
(2) quality assurance
Now, with the electric double girder bridge crane continues to develop, in terms of quality has Nana fill a good guarantee, as long as there are points to ensure users will use them more confidence, which is the product during development process a little more attention, but in terms of quality is more valued.
This is the electric double girder hoist gantry crane on the market gradually developed factor.
2013年9月6日星期五
Forging crane
Forging
hoist gantry crane generally have two cars, a car-based platform, designed for hanging in the forging process billets and slabs hanging flip the turn plate (Flipper) use. Another deputy trolley sleeve ingot is used to support the weight. Sets ingot is forged in order to grip and balance during ingot (or forging) weight tool. According to process requirements, two car on the track in their respective work.
Traveling mechanism set up on the main bridge. Depending on the wheel of the weight, with 6-24, or more. In order to facilitate the driver and hammer (hydraulic) with the operator, usually hanging in the cab allows the driver head-forging position, and a damping device. In order to prevent radiant heat forging effect on drivers, using thermal insulation operating room, and in the indoor air-cooler.
This overhead gantry crane main and auxiliary car roughly the same speed, so that the main and auxiliary car when coordinated to work together. Main small car is equipped with cable reel, cable conductor to manipulate through hanging on a hook on the turn steel machine. There is no hook to prevent the hook in the forging process freely rotating fixtures. In order to reduce the impact load forging the impact of the relevant institutions in turning steel machine parts hanging a spring buffer device.
Forging bridge gantry crane from the weight, there are currently 20/5, 80/30, 125/30, 200/80 t and so are several.
Traveling mechanism set up on the main bridge. Depending on the wheel of the weight, with 6-24, or more. In order to facilitate the driver and hammer (hydraulic) with the operator, usually hanging in the cab allows the driver head-forging position, and a damping device. In order to prevent radiant heat forging effect on drivers, using thermal insulation operating room, and in the indoor air-cooler.
This overhead gantry crane main and auxiliary car roughly the same speed, so that the main and auxiliary car when coordinated to work together. Main small car is equipped with cable reel, cable conductor to manipulate through hanging on a hook on the turn steel machine. There is no hook to prevent the hook in the forging process freely rotating fixtures. In order to reduce the impact load forging the impact of the relevant institutions in turning steel machine parts hanging a spring buffer device.
Forging bridge gantry crane from the weight, there are currently 20/5, 80/30, 125/30, 200/80 t and so are several.
Trolley drive mechanism type
Self-propelled trolley run institutions, each with a small car with four wheels, half based on.Steel crane Its rotation types are divided into two categories, namely with open gears and gear are all closed.
Start gear
Open running gear mechanism enclosed in high-level phase shell inside, oil bath lubrication; using low-grade open gear. Made ring style open gear and the wheel together with the wheel center around a fixed axis. This drive type, can meet the requirements of heavy working conditions, with sufficient reliability, the disadvantage is inconvenient handling wheels overhaul.
Open gear drives the biggest drawback is badly worn, so general-purpose trolley overhead bridge crane operating agencies, mostly with closed gear type.
Enclosed gear drives
Arranged between the two intermediate gear wheels, the drive shaft of the torque by the smaller axis of each side of the shaft torque of the torque gear half. Reducer output shaft to the wheel between the use of semi-floating shaft gear couplings and coupling (two floating shaft can grow, you can also unequal length), or a full-tooth couplings and a floating shaft coupling. The advantage of this type is to allow the installation of large deviations, easy installation, good handling grouping. From the weight of more than 10 tons of overhead hoist crane are using this type of car. This type of drawback is due to the large wheel bearings and couplings, operating mechanism becomes complicated and bulky, resulting in higher costs.
Start gear
Open running gear mechanism enclosed in high-level phase shell inside, oil bath lubrication; using low-grade open gear. Made ring style open gear and the wheel together with the wheel center around a fixed axis. This drive type, can meet the requirements of heavy working conditions, with sufficient reliability, the disadvantage is inconvenient handling wheels overhaul.
Open gear drives the biggest drawback is badly worn, so general-purpose trolley overhead bridge crane operating agencies, mostly with closed gear type.
Enclosed gear drives
Arranged between the two intermediate gear wheels, the drive shaft of the torque by the smaller axis of each side of the shaft torque of the torque gear half. Reducer output shaft to the wheel between the use of semi-floating shaft gear couplings and coupling (two floating shaft can grow, you can also unequal length), or a full-tooth couplings and a floating shaft coupling. The advantage of this type is to allow the installation of large deviations, easy installation, good handling grouping. From the weight of more than 10 tons of overhead hoist crane are using this type of car. This type of drawback is due to the large wheel bearings and couplings, operating mechanism becomes complicated and bulky, resulting in higher costs.
Crane safety working conditions
To ensure the safety of the crane work,
bridge crane design should meet the following three basic requirements:
First, the metal structure and mechanical parts should have sufficient strength, stiffness and flexural capability.
First asked Crane parts and metal structures under load does not destroy, that is to meet the strength requirements. Static strength calculation is the most basic calculations. Stresses the importance of general circulation or fewer parts, only for static strength calculation. Parts or components subjected to cyclic stresses, in addition to fatigue calculation, but also should be the peak load for static strength calculation. For complex stress state and other parts of wire rope, in order to simplify the calculation, usually only by major load, mainly deformed shape, a higher safety factor for static strength calculation.
But alone is not always guaranteed to work damage, such as by an excessive load deformation member will also affect the normal operation. Therefore, you must also request loads, components produced by deformation should be within the allowable range, that with proper rigidity.
Slender rod suddenly bent or pressed steel structures localized buckling in statically determinate structures may result in variable geometry structure. Its original equilibrium state becomes unstable equilibrium, so that the failure of structural parts and components, it will also result in the destruction of the hoist gantry crane , thus satisfying the requirement to meet the stability is also very important.
Second, the machine must have the necessary stability against overturning.
Third, the former winter has to meet the requirements of the job performance power brakes provide the necessary braking torque.
Determine the characteristics of the crane's work load randomness, while the bridge gantry crane is used in deterministic approach, so for complex changes in actual load, only with simple theoretical calculations and experiments and experiences combined calculation to determine by knowledge thus obtained approximate actual load, often called load calculation.
First, the metal structure and mechanical parts should have sufficient strength, stiffness and flexural capability.
First asked Crane parts and metal structures under load does not destroy, that is to meet the strength requirements. Static strength calculation is the most basic calculations. Stresses the importance of general circulation or fewer parts, only for static strength calculation. Parts or components subjected to cyclic stresses, in addition to fatigue calculation, but also should be the peak load for static strength calculation. For complex stress state and other parts of wire rope, in order to simplify the calculation, usually only by major load, mainly deformed shape, a higher safety factor for static strength calculation.
But alone is not always guaranteed to work damage, such as by an excessive load deformation member will also affect the normal operation. Therefore, you must also request loads, components produced by deformation should be within the allowable range, that with proper rigidity.
Slender rod suddenly bent or pressed steel structures localized buckling in statically determinate structures may result in variable geometry structure. Its original equilibrium state becomes unstable equilibrium, so that the failure of structural parts and components, it will also result in the destruction of the hoist gantry crane , thus satisfying the requirement to meet the stability is also very important.
Second, the machine must have the necessary stability against overturning.
Third, the former winter has to meet the requirements of the job performance power brakes provide the necessary braking torque.
Determine the characteristics of the crane's work load randomness, while the bridge gantry crane is used in deterministic approach, so for complex changes in actual load, only with simple theoretical calculations and experiments and experiences combined calculation to determine by knowledge thus obtained approximate actual load, often called load calculation.
What materials commonly used cranes
What materials commonly used cranes?
bridge gantry crane structural parts, metal structures, fittings and accessories are made of metal and non-metallic materials processing.Crane parts generally forgings, rolled parts, welding parts, castings as blanks, after mechanical processing. Forgings, rolled parts, welding parts mainly carbon structural steel, quality carbon structural steel and low-alloy structural steels. Important parts are made of steel, steel structure together with the special requirements of special premiums steel parts. Castings can cast steel, cast iron and bronze. In order to improve the mechanical properties, single girder bridge cranes improved load carrying capacity and life of parts, the casting must be heat treated. Nonferrous metals and alloys are used with high electrical conductivity, wear resistance, corrosion resistance, or other special properties of high strength requirements of the parts
Crane hook material
Crane hook material requires a high strength, toughness and ductility, there is no danger of sudden rupture. Single high strength material and defects usually very sensitive to cracks and higher strength, the greater the likelihood of sudden rupture. Therefore, it is widely used
gantry crane hook material low carbon steel and low carbon steel to manufacture.
According to GB10051-88 "lifting hooks" requirement, forging hook material should be used DG20, DG20Mn, DG34CrMo, DG34CrNiMo, DG34CR2Ni2Mo steel manufacturing and other models, especially DG34CrMo, DG34CrNiMo, DG34CR2Ni2Mo alloy steel, because it contains certain content Cr, Ni , Mo element, can inhibit the austenite grain growth, making it a strong increase;bridge gantry crane during tempering, but also has three elements due to intensity decreased much, but elongation and impact toughness has enhanced many, Given containing Cr, Ni, Mo alloy elements have high strength, toughness and good, use it to create a relatively small hook size, carrying capacity is high.
In order to ensure that the manufacturing out of the hook does not occur in the life of a hard change, aging embrittlement, must ensure that the content of aluminum in the steel, to International Organization for Standardization ISO standard 0.02%.
Chip hook is generally used for large tonnage or a hot place by strong, he is usually with a thickness not less than 20mm of A3, 20 or 16Mn steel plate. Chip hook generally not a sudden rupture and damage because of breakage caused by defects confined to individual plates,hoist gantry crane and the remaining plate can still support the lifting of individual damaged plate can be replaced, and thus greater than the safety hook forging sex.
According to GB10051-88 "lifting hooks" requirement, forging hook material should be used DG20, DG20Mn, DG34CrMo, DG34CrNiMo, DG34CR2Ni2Mo steel manufacturing and other models, especially DG34CrMo, DG34CrNiMo, DG34CR2Ni2Mo alloy steel, because it contains certain content Cr, Ni , Mo element, can inhibit the austenite grain growth, making it a strong increase;bridge gantry crane during tempering, but also has three elements due to intensity decreased much, but elongation and impact toughness has enhanced many, Given containing Cr, Ni, Mo alloy elements have high strength, toughness and good, use it to create a relatively small hook size, carrying capacity is high.
In order to ensure that the manufacturing out of the hook does not occur in the life of a hard change, aging embrittlement, must ensure that the content of aluminum in the steel, to International Organization for Standardization ISO standard 0.02%.
Chip hook is generally used for large tonnage or a hot place by strong, he is usually with a thickness not less than 20mm of A3, 20 or 16Mn steel plate. Chip hook generally not a sudden rupture and damage because of breakage caused by defects confined to individual plates,hoist gantry crane and the remaining plate can still support the lifting of individual damaged plate can be replaced, and thus greater than the safety hook forging sex.
Detailed explanation of test tower cranes bolted preload and methods !
Stress analysis of the Steel crane bolted , drawn preload installed in the tower 's importance to derive preload application methods . This article focuses on the tower crane bolt connection. Keywords: tower crane bolt preload application .
( A ) by the bolt preload and the relationship between force
If fully tighten the nut , then the nut in the axial direction of the bolt forward h, is bound by the bolt preload leaving the board under pressure , assuming that the bolts between the plates cut along with the P stands for preload , T represents cubicle the extrusion pressure , obtained by the equilibrium condition P = T, and the extrusion pressure is equal to the preload , when the elongation of the bolt shaft Δl1, deformation of the pressing plate , terms of E1 and A1 represents the elastic rod bolt modulus and cross-sectional area , E2 and A2 represents plate modulus and cross-sectional area , according to Hooke's law , as P = T.
N role when the external force , because the force is not directly applied to the bolts , but added to the board are connected , thus tends to be even parts separate , deformation decreases, reducing the pressing force between the plates , the by the extrusion pressure is reduced to this case by the equilibrium conditions between the plates when the increase to the original compression completely disappeared, the pressing force between the plates disappeared , with a balanced preload disappeared. But it does not mean that the bolt is not exposed to tension, on the contrary , when the deformation between the plates is completely disappeared , corresponding to an elongated bolt , the bolt force increment elongated , by the force equilibrium conditions at this time . From the above analysis , tensile bolt connection must preload , the connected parts being squeezed, when subjected to external forces , connections between the extrusion pressure decreases with force , preload also decreases. When the external force so that the two connections increased to just separated from the preload is reduced to zero , will be greater than the tension bolt suffered original static preload applied when connecting .
( Two ) the characteristics of high strength bolts
The shaft bolt 45 heat-treated steel or alloy steel, its performance rating of 8.8 , 10.9 or higher. Nuts and washers for the corresponding performance level made of steel , the installation requires very tight bolts , made great preload, the component contact surfaces pressed . Friction -type high strength bolts completely rely on the friction between the contact surface to transfer shear , and slippage as the carrying capacity limit state . Pressure type high strength bolts to connect the failure of bearing capacity limit state , and slippage limit the normal operating state . Preload applied generally bolt material yield limit of the net cross-sectional area multiplied 0.7 times , the choice should be less than the maximum working tension preload to the contact surface between the member is still residual preload, to ensure the normal work reliability.
( Three ) standard section of tower crane tower casing bolts
Standard tower sections for the main force component , working under axial force , bending moment and torque. Connection between standard section , I plant a tube connecting bolts , tower main limb composed by a single angle , the main casing head and extremities flat upper and lower ends connected to the friction between the plane can withstand the torque caused by the work shear , therefore , can be regarded as the connecting bolt friction type , but with the bolt connection , so the preload is one not to be neglected . We found that a considerable number of tower crane standard section in connection with the bolt preload specified values are not reached , when working with the tower overhead gantry crane , tower main limb repeated tension and compression alternating , nuts relaxation, the main limb the gap between the end faces increases, the boom and the tower at the junction of horizontal displacement increases, causing the tower widening secondary stress , so that security reduced, and some even lead to an accident down the tower , so the pre- clamping force implementation methods and numerical control is an important part of the tower crane installation .
( Four ) tower crane slewing ring bolts
According to the work force characteristics , slewing ring friction-type high strength bolt should belong , slewing ring and the upper and lower bearing seat connection work is generally done on the ground , tighten the bolts , the available torque angle method or the method of symmetrical uniform in the circumferential direction several times tighten to achieve the required preload.
According to Hooke's law for more than bolted stress analysis , export preload on the tower crane on the application method , in the absence of a torque wrench in the case , the use of angle method can effectively achieve and guarantees required when installing preload value. Stress analysis for bolted connections , draw preload installed in the tower 's importance to derive preload application methods . This article focuses on the tower jib crane bolt connection. Keywords: tower crane bolt preload application .
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