翻译-混凝土喷射机的概述及改进-机械毕业设计资料翻译

3.0 闻远设计 2023-09-29 74 4 92KB 9 页 15光币

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中国矿业大学 2008 届本科生毕业设计

Summarization and improvement of concrete-ejecting

machines

FAN Hua 　QIULinfeng 　CHENLingfang

Abstract :The text introduces the principle ,style and development process of dry

and wet type concrete-ejecting machines. It analyzes domesticand

foreign application instance ,allkindsofconcrete-ejecting machines

mostly merit and flaw. Also it introduces somerepresentational wet

con-crete-ejecting machines domestic developed. Some flaws of

concrete-ejecting machines are improved.

Keywords:concrete-ejectingmachines,frame characteristic ,operating principles

, highway.

Concrete is the use of compressed air jet, will be allocated a certain level and

good water-cement ratio mixing concrete materials, through the pipeline by the jet

nozzle, and high speed jet out to the surface by spraying a concrete suppor-t Layer is

sprayed concrete construction equipment operations in the main. Asa concrete

spraying technology saving concrete and steel, timber, labour-saving and improve

construction efficiency and reduce costs, and other characteristics, the concrete

applican of the jet increasingly common. Has now been widely us-ed in railway,

highway, water conservancy, construction, coal and other buildi -ng works in

construction, a tunnel solution, road slope, construction pit, unde-rground works of

temporary and permanent care to support the construction m-achinery operations. [

1 ]

1 The work of sprayed concrete mechanism and the development trend

In sprayed concrete operations, the overwhelming majority of the use of

concrete-rotor aircraft, such as jet structure is simple, reliable performance, a small,

lightweight, easy to operate and maintenance。Dry jet principle and structure are: the

rotor with a liner to a certain speed of rotation, and the combination of pressure

plates fixed on the liner fixed, with a board connected into the wind pipe and

discharging elbow, when Rotor equipped with materials in the various materials Cup

rotation and into the wind to the elbow and discharging the same time, in the role of

gas under pressure, and materials through the elbow and expected to lose the

material transported to the nozzle a nd nozzle in the water Blasting away.

Dry concrete jet of the main advantages is a long distance carrier, simple

equipment, durable, but because it is so dry nozzles, mixing concrete mixed with

water, and therefore the construction dust, are more resilient, dry spraying operations

against workers in the dust Health, in particular the narrow roadway construction,

dust pollution is more serious [2]。

From the 1960s onwards, in Western developed countries, wet spraying

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中国矿业大学 2008 届本科生毕业设计

began gradually introducing the technology, all kinds of wet concrete Jets also be

developed, sprayed concrete and dry the main difference is that enough (in water-

cement ratio requirements should be The volume of) the opportunity to join the

mixing of different water。Wet sprayed concrete is expected lose their access to the

former Mixture has added a foot of water mixing, the loser in the delivery of the

cylinder is the wet concrete; dry sprayed concrete is lost in the transmission of the

material did not join the mixing Water dry material (ground humidity mixing natural

materials or drying materials), and in sufficient volume nozzle before mixing with

water, dry mixture and mix quickly after the whole wet concrete delivered to the

nozzle, speed up the coagulation of the doped Afte r the jet to beam a material of

construction [3].

At the national level, as people's environmental awareness and enhance the

quality of sprayed concrete requirements of the increase, an increasing number of

wet concrete into the use of jet aircraft. In recent years, some domestic units also

began to develop several wet concrete jet, but the scale of production is still to be

expanded. To sum up, jet wet concrete of the main advantages are the following:

1) greatly reduced the plane and next to the nozzles of dust concentration and

eliminate the health hazards to workers.

2) high productivity. Dry concrete Jets general no more than 53 m3 / h, and

the use of jet wet concrete, artificial operations up to 103 m3 / h, a mechanical

manual, up to 203 m3 / h.

3) The rebound was low. Jet Dry, concrete rebound of up to 15 percent to 50

percent, the wet spray technical rebound rate can be reduced to below 10%.

4) wet spray, easy to control because of water-cement ratio, a high degree of

concrete hydration, it can significantly improve the quality of sprayed concrete and

improve quality of the concrete absorbed.

2 Wet concrete Jets and the type of work principle

Concrete Pumping main piston pump-jet spray and a wet-wet spraying machine

screw pump two categories. Piston pump-jet aircraft will be wet plunger-wet

concrete as a concrete pump the basic body jet, with the export pipeline to the nozzle

and in this Access to compressed gas will jet out of concrete, wet spray such a heavy

machine general However, long distance transmission, Second Beach, the

Xiaolangdi Water Conservancy Project and other large-scale use of the aircraft's

main disadvantage is that low productivity, and screw the stator sets of wear and tear

more serious, there was little scope of application.

3 Domestic wet concrete Jets

3. 1 SPZ26-wet concrete Jets

SPZ26-wet concrete jet sent to a gas-rotor aircraft wet concrete, and its

working principle of Liwa 280 Ruishi A similar model, by its rotor rotary motor

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中国矿业大学 2008 届本科生毕业设计

driven by reducer, the aircraft equipment less investment, high productivi ty, light

weight , Good mobility [4].

3. 2 PZ25B Concrete jet aircraft to spray dry, wet spray and spray tide. It

automatically clean, non-stick block, cutting speed, little more than expected, h igh

efficiency.

3.3 impeller wet concrete wet concrete impeller jet aircraft is a new wet

spraying machine, it adopted a impeller feeding device, a reliable, long life, to

aggregate size of the big advantages. At present, China's development of the wet

concrete pumping and dual-use spray-spray-wet concrete tunnel construction is

indispensable to engineering equipment, the main impeller and rotor piston-type

pumps and wet spraying machine. Impeller and rotor piston wet spraying machine

short-distance transportation, displacement of small, fragile pieces of short life,

serious leakage pulp, cleaning a long time [5].

4 Jet promote the use of wet concrete in some of the issues to be resolved

At present, due to wet jet technology has obvious advantages, wet concrete Jets

in the project is also an increasing number of applications, but because there are

some outstanding issues, the wet concrete to promote the use of jet played a certain

obstacles Role, even in China, currently the main sprayed concrete operations is still

dry spray.

1) use of wet concrete jet of liquid condensate, a joint venture of imports and

higher prices (up to 6000 yuan / t ~ 8 000 元/ t), and domestic liquid condensate of

no production, should be relatively dry Spray of powder and quick-setting low price

(more than 1000 yuan / t).

2) low labor costs and people's environmental awareness to be increased.

3) wet concrete jet operations, more complex equipment, operation and

maintenance of jet aircraft for less than dry. 4) the use of wet concrete jet operations,

higher equipment investment.

5 Improvement of concrete-ejecting machines

5.1 After the concrete improvement of the characteristics of a jet

1) dust better. The improved use of the seal can not be dust, has greatly

improved the working conditions of workers, increased labor productivity.

2) increase the flexibility of high-adhesive rubber material cavity. Concrete

can be an effective solution to the problem of bonded easily, remove the

concrete to reduce the number of bonded and improve labor efficiency.

3) use of wear-resistant rubber pads. Rubber mats more than double the wear

resistance, a decrease of rubber pads to reduce the frequency of the use of

replacement cost.

4) the overall change from the original drive shaft composed of three parts,

not easy to solve the demolition, the problem of maintenance.

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摘要：

中国矿业大学2008届本科生毕业设计Summarizationandimprovementofconcrete-ejectingmachinesFANHua　QIULinfeng　CHENLingfangAbstract:Thetextintroducestheprinciple,styleanddevelopmentprocessofdryandwettypeconcrete-ejectingmachines.Itanalyzesdomesticandforeignapplicationinstance,allkindsofconcrete-ejectingmachinesmostlymer...

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