液压升降平台-液压升降车毕业课程设计外文文献翻译、中英文翻译

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英文文献翻译

1.1Design Of A Lift

Hydraulic

lifting

platform

is

a

versatile

crane

lifting

equipment,

widely

used

in

factories,

docks,

construction,

transportation,

sports,

equipment

maintenance

and other high-altitude operations and maintenance. Existing hydraulic lifting

platform there are many, can be roughly divided into: four-wheel mobile lifting

platform,

push-type

lift

platform,

car

load

lifting

platform,

fixed

platform

lift,

scissor lift platform, four-post lift The two column lift and so on.

In recent years, with the rapid increase in the use of cars, China's booming

auto industry, especially the car industry. This makes the auto repair industry

has grown, demand for automotive maintenance equipment rapid expansion, but also

the maintenance requirements in the automotive tools and equipment requirements

on

the

increasingly

high

lift

vehicle

repair

workshop

is

essential

and

most

important maintenance machinery and equipment. The role of auto lift car is in

need of repair, a smooth upgrade to the appropriate height, so that maintenance

workers at the bottom of the car chassis maintenance and inspection. Generally

divided into high column car lift and scissors. Either way, are required to meet

the

synchronous

lifting

the

car,

cornering

can

not

happen,

and

asked

for

the

empty

chassis bottom for easy maintenance workers for maintenance work which requires

lifting platform synchronous lifting, running smoothly. Therefore, maintenance

of the car lifting platform equipment is generally driven by hydraulic system.

With the expanding service sector, as well as the further development of

automation, the maintenance staff to reduce labor intensity, making the easy

maintenance, and can better improve the efficiency of vehicle maintenance, and

car

maintenance

service

quality,

so

the

hydraulic

lift

Platform

automation

requirements are also rising. Vehicle maintenance is currently required to meet

the synchronization control, lifting the platform lift system depends mainly on

the

hydraulic

system

and

electrical

control

and

drive

systems,

but

the

lift

1

platform is currently owned by the widespread leakage, internal leakage, short

life,

the

operation

not

flexible,

synchronous

operation

and

low

defects.

To

avoid

these disadvantages, require more precise synchronization to ensure that the

hydraulic lifting platform lift precision, and now most of the hydraulic lifting

platform simultaneously phasing out all traditional hydraulic valves, the use of

more precise control

of the new electro-hydraulic servo valve,

electro-hydraulic

proportional digital electro-hydraulic valve and valve to control the hydraulic

system,

to

achieve

synchronization

and

high

precision.

As

a

form

of

electro- hydraulic proportional valve type of diverse, easy to use composition of

a

variety

of

electrical

and

computer-controlled

hydraulic

system,

control

of

high

precision, installation flexibility and strong anti-pollution and many other

advantages.

Currently used in the automotive repair Hydraulic synchronous lift platform

vehicle maintenance plays an important role in synchronous lifting platform on

a

variety

of

hydraulic

valves,

hydraulic

cylinders,

hydraulic

pump

station

innovation and improvement, making a hydraulic lifting platform synchronization

smooth running, low noise, fast response, high precision synchronization of the

repair and maintenance in the car played a crucial role.

With

the

hydraulic

lift

platform

in

the

automotive

repair

industry,

application

and further improvement and innovation in the maintenance of hydraulic lifting

platform has the car can achieve more complex functions, the structure of the

platform, drive on, and a variety of control systems, has been greatly improved.

The current lift platform lift system is mainly driven by the hydraulic system,

of course, do not

rely on

hydraulic

pressure, as well as

dual-use

diesel electric

rotary lift platform, now appeared battery driven lift platform, continuously

variable transmission can be achieved with safer, more convenient and low noise

advantages. Lifting platform is currently widespread leakage, internal leakage,

short

life,

the

operation

is

not

flexible,

synchronous

operation

and

low

defects.

To

avoid

these

disadvantages,

require

more

precise

synchronization

to

ensure

that

2

the hydraulic lifting platform lift precision, and now most of the hydraulic

lifting

platform

simultaneously

phasing

out

all

traditional

hydraulic

valves,

the

use

of

more

precise

control

of

the

new

electro-hydraulic

servo

valve,

electro-hydraulic

proportional

digital

electro-hydraulic

valve

and

valve

to

control the hydraulic system, to achieve synchronization and high precision. As

a

form

of

electro-hydraulic

proportional

valve

type

of

diverse,

easy

to

use

composition of a variety of electrical and computer-controlled hydraulic system,

control

of

high

precision,

installation

flexibility

and

strong

anti-pollution

and

many other advantages, applications become increasingly broadened.

In

China,

although

synchronous

hydraulic

lifting

platform

for

such

development,

production started late, but with China's rapid economic development, in order

to adapt to China in various fields used by the synchronous hydraulic lifting

platform development needs and take the large-scale, standardized , intensive,

product support services, achieving mechanical, electrical, fluid integration

platform in the application of synchronous movements. The use of synchronous

hydraulic

lifting

platform

surface,

the

service

has

been

expanding,

is

now

in

rapid

development

stage,

and

now

hydraulic

lifting

platform

reliability,

security,

easy

operation

and

simple

directness,

and

other

aspects

greatly

improved,

and

with

the

the popularity and development of computer and mechanical, electrical, fluid

integration progress of the study, major domestic and foreign companies have to

compete

with

the

computer

(electronic)

control

system

to

improve

overall

performance

and

reduce

the

use

of

hydraulic

components,

machine,

reducing

the

whole

size

and

weight,

improve

the

sensitivity

of

control

and

synchronization

accuracy.

In

particular,

the

manufacturers

actively

introducing

and

digesting

foreign

advanced technology, development of new varieties, improving product technology

and quality level, has been part of the hydraulic lifting platform synchronized

at or close to the international level of similar products.

Currently used in the automotive repair Hydraulic synchronous lift platform

vehicle maintenance plays an important role in synchronous lifting platform on

3

a

variety

of

hydraulic

valves,

hydraulic

cylinders,

hydraulic

pump

station

innovation and improvement, making a hydraulic lifting platform synchronization

Smooth

running,

low

noise,

fast

response,

high

precision

synchronization,

for

the

repair and maintenance of the car plays an irreplaceable role in a wide range

prospects. Therefore, the lifting platform for further research and improvement,

optimize system performance and structure to further improve to make up for the

shortcomings of existing technology has important significance.

The

subject

of

the

design

of

the

hydraulic

lifting

platform

main

use

of

theoretical

research

and

design,

through

the

understanding

and

study

of

the

hydraulic

system,

as

well

as

existing

control

technologies

and

more

in-depth

research

and

development,

in

the

hydraulic

system

components

and

further

understanding

and

learning

,

Combined

with

the

modernization

of

hydraulic

components

and

automation

and

control

components

within

the

hydraulic

control

through

traditional

high-tech

components

and

control

elements

of

existing

comparative

and

comprehensive

application

of

the

traditional hydraulic system, based on the research and design more innovative

set

of

machines

,

Electricity,

liquid

in

one

of

the

hydraulic

control

system,

makes

the system more stable and faster to achieve the advantages.

Hydraulic lift platform system, requires the ability to achieve four-wheeled

vehicles

in

a

controlled

synchronous

lifting

height

lifting

range,

to

achieve

safe

and reliable control of the two front, two rear, two revolvers, two rounds of

synchronous lifting the right and to ensure synchronous movements accuracy. The

hydraulic

lift

system

also

must

have

a

fast

response

speed,

hydraulic

power

units,

small

size,

compact

structure,

large

power

weight

ratio,

ease

of

manipulation

and

control, labor-saving convenience and easy to implement automated, with overload

protection

for

high

reliability

requirements

system,

excellent

technical

performance,

while

ensuring

synchronous

hydraulic

lifting

platform

can

be

anywhere

in the vertical direction on a longer time (60 min or longer) within a reliable

locking,

the

system

can

work

continuously

and

reliably,

the

system

energy

efficient,

easy

to

maintain

low

cost.

Hydraulic

lift

platform

to

meet

system

design

4

requirements,

synchronous

movements

smooth,

and

the

design

to

achieve

the

functional requirements, develop the system closed-loop control of hydraulic

systems, hydraulic systems used to satisfy the synchronization requirements of

precision

and

control

to

achieve

the

four- wheeled

vehicles

in

a

controlled

synchronous lifting height lifting range, to achieve safe and reliable control

of the two front, two rear, two revolvers, two rounds of synchronous lifting the

right and to ensure the accuracy of synchronous movements.

To meet the synchronous lifting hydraulic system, the system needs to have

synchronization control device to achieve synchronization. Synchronization of

hydraulic

system

is

currently

running

multiple

control

methods,

mainly

mechanical

synchronization method, pump or motor parallel method, double rod cylinder in

series,

control

valve,

synchronizer,

synchronization

control

valve

circuit,

servo

and so on.

According

to

the

design

of

machinery

and

equipment

requirements

for

the

realization

of

a

better

two-car

front-wheel,

two

rear,

two

revolvers,

two

synchronous lifting the right wheel, respectively, the flexible control, the

design of the four hydraulic cylinders used for its intended to achieve their

respective

parts

of

the

wheel

lift

and

flexible

control.

Synchronization

to

achieve

higher

accuracy

and

more

flexible

control,

the

design

does

not

use

the

traditional

control

valves

to

control,

but

intends

to

adopt

more

new

electro- hydraulic

proportional control valve to control. Electro-hydraulic proportional control

valve is between the ordinary hydraulic valve and servo valve between a fluid

control valves, servo valves with similar functions, but also has its specific

advantages.

Proportional

solenoid

valve

is

replaced

by

the

proportion

of

ordinary

hydraulic valve adjustment and control devices and form, it can be given input

voltage

or

current

signal

proportional

continuous,

remote

control

of

the

direction

of flow, pressure and flow. Reasonable use of electro-hydraulic proportional

control valve can improve the automation and accuracy, and simplify the system.

Commonly

used

proportional

valve

can

be

divided

into:

proportional

pressure

valve,

5

proportional flow valves and proportional directional valve three.

The

design

uses

electro-hydraulic

proportional

control

system,

closed-loop

feedback control system, the detection by the sensor and fed back through the

electro-hydraulic

proportional

plc

valve,

electro-hydraulic

proportional

control

valve opening size corresponding to the achievement of the hydraulic cylinder to

achieve synchronous lifting control accuracy. To ensure the hydraulic cylinder

to achieve at work to ensure self- locking, hydraulic system should be in each

cylinder fuel supply system with check valve to achieve self-lock function to

ensure the safety of hydraulic lifting platform. Overload protection to ensure

the realization of the hydraulic system, hydraulic system relief valve in the

hydraulic pump that needs to be installed to ensure the safety of the system to

provide a certain pressure. Oil to the system to meet the system requirements to

run

and

quality

of

hydraulic

oil,

hydraulic

system

should

be

in

the

inlet

and

outlet

port to install filters. In order to meet the hydraulic system can be fully

automated, the system of hydraulic directional control valve solenoid valve are

used. In order to better respond to energy problems, you can, where necessary,

instead

of

using

the

accumulator

motor-driven

pump

provides

the

pressure

accumulator to provide the direct use of the hydraulic cylinder pressure to meet

the relevant sport.

In order to achieve self-locking hydraulic cylinder to the function of the

hydraulic system in the bottom of each cylinder are equipped with check valve,

check valve can achieve one-way self- locking, two-way communication function of

the oil. In order to provide security to meet the hydraulic system pressure, not

suddenly as high pressure hydraulic system of the adverse effects or even damage

some of the hydraulic components, so

as

a safety valve with

pressure relief valve

to prevent hydraulic overload protection. In order to achieve automation of the

hydraulic

system

to

meet

the

simultaneous

operation

of

the

system

is

more

accurate,

and

the

realization

of

the

system's

high

efficiency,

rapid

response

requirements,

the

use

of

electro-hydraulic

proportional

directional

control

valve

to

high

6

precision, fast response to the synchronization control. Most of the traditional

manual control valve, which controlled comparison machinery, it is difficult to

achieve

automation.

Electromagnetic

valve,

use

the

pull

solenoid

valve

to

control

the direction of control of the commutation circuit to achieve better automated

results. Shunt valve assembly, also known as synchronous valve, is a hydraulic

diversion valve, valve functions in one set of the independent hydraulic device.

Shunt valve synchronization is the set speed sync, that is, when two or more

cylinders

cylinder

under

different

loads,

respectively,

the

shunt

valve

set

pressure and flow through the sensitive internal components automatically adjust

the fuel tank of exercise to maintain synchronization. Shunt valve assembly is

mainly used in multi- cylinder hydraulic cylinder and the synchronization control

system. Split set by the synchronous control flow valve hydraulic system has a

simple structure, low cost, design, sets, debugging and ease of use, reliability

and

many

other

advantages,

which

shunt

valve

assembly

in

the

hydraulic

system

has

been widely used, so there will also be a reasonable set of flow diversion valve

used

to

achieve

simultaneous

control

of

two

hydraulic

cylinders.

In

the

hydraulic

system, the oil cleanliness of the normal operation of the hydraulic system has

a vital role, so the oil pump and fuel tank return port port filters have been

installed

in

order

to

ensure

that

the

cleaning

fluid

degrees,

which

is

an

indispensable circuit hydraulic system attachment.

In this system, due to the beneficial effects of gravity, the decline in the

course of lifting platform, you can completely rely on gravity to provide power,

where only one-way valve on the hydraulic control valve port for remote control

of the pressure to provide, in under the action of gravity to allow check valve

can be decreased to achieve oil return channel, as the pressure is not big, so

no need to re-use of oil pump drive motors to achieve the check valve through the

oil pressure can be used directly to provide the pressure accumulator, so the

treatment,

not

only

simplifies

the

system control,

and

can

better

save

energy

and

avoid frequent start the motor, can effectively extend the life of the motor and

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