NZ733244B - Telescopic connection component and aerial work platform - Google Patents
Telescopic connection component and aerial work platformInfo
- Publication number
- NZ733244B NZ733244B NZ733244A NZ73324417A NZ733244B NZ 733244 B NZ733244 B NZ 733244B NZ 733244 A NZ733244 A NZ 733244A NZ 73324417 A NZ73324417 A NZ 73324417A NZ 733244 B NZ733244 B NZ 733244B
- Authority
- NZ
- New Zealand
- Prior art keywords
- telescopic
- arm
- cylinder
- transmission component
- hinged
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 62
- 210000000245 Forearm Anatomy 0.000 claims abstract description 61
- 230000003993 interaction Effects 0.000 abstract 2
- 238000010276 construction Methods 0.000 description 7
- 230000000875 corresponding Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 230000001808 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D46/00—Picking of fruits, vegetables, hops, or the like; Devices for shaking trees or shrubs
- A01D46/20—Platforms with lifting and lowering devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/044—Working platforms suspended from booms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/044—Working platforms suspended from booms
- B66F11/046—Working platforms suspended from booms of the telescoping type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/09—Other lifting devices
Abstract
aerial work platform includes a vehicle, a telescopic transmission component, a telescopic connection component, and an operation platform all of which are movably connected with each other in sequence; the telescopic connection component comprises: an outer arm, an inner arm slidably disposed inside the outer arm and capable of being moved out from one end of the outer arm, and a forearm telescopic cylinder disposed between the outer arm and inner arm; the cylinder body is secured onto an outer wall of the outer arm, and an extension end of the piston rod is secured onto an outer wall of the inner arm; a supporting member is disposed between the vehicle and telescopic transmission component, and another supporting member is placed between the telescopic transmission component and telescopic connection component; the supporting member disposed between the telescopic transmission component and telescopic connection component is a first levelling cylinder; one end, which is connected to the telescopic transmission component, of the telescopic connection component, is hinged to a forearm head; and one end of the first levelling cylinder is hinged to the telescopic transmission component, while the other end is hinged to the forearm head; and the forearm head, outer arm and telescopic transmission component are hinged together by a pin. This way, connection structure among the forearm head, outer arm and telescopic transmission component is simplified significantly and interaction among them is also effectively improved. side the outer arm and capable of being moved out from one end of the outer arm, and a forearm telescopic cylinder disposed between the outer arm and inner arm; the cylinder body is secured onto an outer wall of the outer arm, and an extension end of the piston rod is secured onto an outer wall of the inner arm; a supporting member is disposed between the vehicle and telescopic transmission component, and another supporting member is placed between the telescopic transmission component and telescopic connection component; the supporting member disposed between the telescopic transmission component and telescopic connection component is a first levelling cylinder; one end, which is connected to the telescopic transmission component, of the telescopic connection component, is hinged to a forearm head; and one end of the first levelling cylinder is hinged to the telescopic transmission component, while the other end is hinged to the forearm head; and the forearm head, outer arm and telescopic transmission component are hinged together by a pin. This way, connection structure among the forearm head, outer arm and telescopic transmission component is simplified significantly and interaction among them is also effectively improved.
Description
SPECIFICATION
Telescopic connection component and aerial work
platform
FIELD OF THE INVENTION
The present invention relates to field of
engineering mechanics and more particularly, relates to
an engineering work vehicle, and most particularly,
relates to a telescopic connection component and aerial
work platform.
BACKGROUD OF THE INVENTION
Aerial work platform is an advanced aerial
working mechanical device, and is capable of
significantly improving efficiency, safety, and comfort
of operators at height, and is also capable of reducing
labor. Accordingly, it is widely employed in developed
countries. This aerial work platform is also extensively
used in China in many fields such as urban street lamp
maintenance, tree trimming or the like. With rapid
development of Chinese economy, aerial work platform is
increasingly required in many situations such as
engineering construction, industry installation,
equipment repair, workshop maintenance, ship
manufacture, electric power, municipal construction,
11194592_1 (GHMatters) P106231.NZ
airport, communications, city park, and transportation.
In a conventional aerial work platform, the
forearm for connecting the operation platform and main
arm (for example a telescopic connection component) is
of a parallelogram construction. In this construction,
two connecting points of the operation platform are
hinged to two corresponding connecting points of the
forearm connected with the main arm through two
connection arms. In addition, a line defined by the two
connecting points of the operation platform is parallel
to another line defined between the two connecting points
of the forearm, thus forming a parallelogram by these four
connecting points of the platform and forearm. Luffing
and levelling function is given to the forearm by
equipping with a luffing cylinder and levelling cylinder.
As a prior art forearm is of a parallelogram construction,
its horizontal reach is seriously restricted by the
length of the connection arm. In addition, the aerial work
platform has relatively less flexibility in the working
area due to its parallelogram construction of forearm.
Accordingly, there is need for providing an
improved connection structure for coupling the operation
platform and main arm together and a corresponding aerial
work platform to overcome drawbacks of prior art.
11194592_1 (GHMatters) P106231.NZ
SUMMARY OF THE INVENTION
An object of the present invention is to address
above problems and provide a telescopic connection
component and aerial work platform. The telescopic
connection component has a relatively longer horizontal
reach thus widening working area of the aerial work
platform. Moreover, the telescopic connection component
owns higher structural strength and stability, thus
greatly ensuring safety of the aerial work platform.
To realize this object, an embodiment of the
invention provides a telescopic connection component for
telescopically connecting a telescopic transmission
component and an operation platform of an aerial work
platform together. The telescopic connection component
includes: an outer arm, an inner arm slidably disposed
inside the outer arm and capable of being moved out from
one end of the outer arm, and a forearm telescopic
cylinder disposed between the outer arm and inner arm.
Specifically, the forearm telescopic cylinder
includes a cylinder body and a piston rod slidably
disposed into the cylinder body. The cylinder body is
secured onto the outer arm, and an extension end of the
piston rod is secured onto the inner arm.
Preferably, the cylinder body is secured onto
an outer wall of the outer arm, and an extension end of
11194592_1 (GHMatters) P106231.NZ
the piston rod is secured onto an outer wall of the inner
arm.
Correspondingly, an embodiment of the present
invention further provides an aerial work platform
including a vehicle, a telescopic transmission component,
a telescopic connection component, and an operation
platform all of which are movably connected with each
other in order. A supporting member is disposed between
the vehicle and telescopic transmission component, and
similarly, another supporting member is placed between
the telescopic transmission component and telescopic
connection component.
Optionally, the supporting member disposed
between the telescopic transmission component and
telescopic connection component is a luffing cylinder.
Optionally, the supporting member disposed
between the telescopic transmission component and
telescopic connection component is a first levelling
cylinder. One end, which is connected to the telescopic
transmission component, of the telescopic connection
component, is hinged to a forearm head. One end of the
first levelling cylinder is hinged to the telescopic
transmission component, while the other end is hinged to
the forearm head.
Furthermore, the telescopic connection
11194592_1 (GHMatters) P106231.NZ
component further includes a forearm luffing cylinder one
end of which is hinged to the forearm head, while the other
end thereof is hinged to the outer wall of the outer arm.
By this means, the forearm head, outer arm and forearm
luffing cylinder constitute a triangle luffing
mechanism.
Furthermore, a third levelling cylinder is
disposed between the telescopic connection component and
operation platform. One end of the third levelling
cylinder is hinged to the inner arm, whereas the other
end thereof is hinged to a rotary cylinder secured onto
the operation platform.
Optionally, an angle sensor cooperating with the
third levelling cylinder is provided on the rotary
cylinder.
Optionally, a second levelling cylinder is
positioned between the forearm head and telescopic
connection component. One end of the second levelling
cylinder is hinged to the forearm head, while the other
end thereof is hinged to the outer wall of the outer arm.
A cavity of the second levelling cylinder communicates
with a cavity of the third levelling cylinder by means
of an oil tube.
Compared with prior art techniques, the present
invention brings the following good effects:
11194592_1 (GHMatters) P106231.NZ
In present invention, the telescopic connection
component includes an outer arm, an inner arm slidably
disposed inside the outer arm and capable of being moved
out from one end of the outer arm, and a forearm telescopic
cylinder disposed between the outer arm and inner arm.
As a result, when driven by the forearm telescopic
cylinder, the inner arm will be able to move into and out
of the outer arm. During this process, the inner arm is
capable of moving out of the outer arm, the horizontal
reach of the operation platform connected to the inner
arm will be increased, thereby increasing working range.
Secondly, in present invention, a levelling
mechanism is disposed between the telescopic
transmission component and telescopic connection
component, and another levelling mechanism is similarly
placed between the telescopic connection component and
operation platform. This ensures stable movement of the
operation platform along any direction in a horizontal
plane during operation, thus maintaining security of
operators.
Thirdly, for the telescopic connection
component, its inner arm is movably disposed in the outer
arm, a supporting member is disposed between the
telescopic transmission component and telescopic
connection component, and similarly, another supporting
11194592_1 (GHMatters) P106231.NZ
member is placed between the telescopic connection
component and the operation platform. These
constructions of the telescopic connection component
bring higher structural strength and stability for the
aerial work platform and accordingly, they also improve
safety of the aerial work platform.
In a summary, the telescopic connection
component has longer horizontal reach so that the
operation platform is capable of moving to a further
region in a horizontal direction, thus increasing working
range of the aerial work platform. In addition, the
telescopic connection component has higher structural
strength and stability and accordingly, it also improves
safety of the aerial work platform.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a schematic view of an aerial work
platform in accordance with a typical embodiment of the
invention;
Figure 2 shows a partially enlarged view of
portion M of figure 1;
Figure 3 illustrates another view of a front
component of the aerial work platform of figure 1, the
front component including a telescopic connection
component, an operation platform, and relevant
11194592_1 (GHMatters) P106231.NZ
connection components;
Figure 4 shows a schematic view of a telescopic
transmission component of the aerial work platform of
figure 1;
Figure 5 shows a partially enlarged view of
portion A of figure 4;
Figure 6 shows a partially enlarged view of
portion B of figure 4;
Figure 7 shows a view of the telescopic
transmission component of figure 4 in an expanded
configuration;
Figure 8 denotes a structural view of internal
major transmission members of the telescopic
transmission component of figure 4, the major
transmission members including a first sprocket wheel,
a second sprocket wheel, a rope-expanding chain, a
rope-retracting chain, and a retractable cylinder;
Figure 9 shows a schematic view of internal major
transmission members of the telescopic transmission
component of figure 4;
Figure 10 shows a schematic view of internal
major transmission members of the telescopic
transmission component of figure 4;
Figure 11 denotes a structural view of the
retractable cylinder of the telescopic transmission
11194592_1 (GHMatters) P106231.NZ
component of figure 4;
Figure 12 shows a partially enlarged view of
portion C of figure 11; and
Figure 13 illustrates a view of a front component
of an aerial work platform according to another
embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be further described
below with reference to accompanied drawings and
exemplary embodiments. Here, identical numerals
represent the identical components. In addition,
detailed description of prior art will be omitted if it
is unnecessary for illustration of the features of the
present invention.
Figures 1-12 show a typical embodiment of an
aerial work platform of the present invention. The aerial
work platform incudes a vehicle 1, a telescopic
transmission component 2 pivotablly installed on the
vehicle 1, and an operation platform 3 connected to a
distal end of the telescopic transmission component 2 via
a telescopic connection component 5.
It is noted that the vehicle 1 includes a vehicle
frame, a driving system disposed on the vehicle frame,
and a control box electrically connected to the driving
11194592_1 (GHMatters) P106231.NZ
system. The control box is disposed at a lateral side of
the vehicle frame in a rotary manner. The driving system
includes a power system, a transmission mechanism, a
control system, a driving mechanism, and a wheel assembly.
The control box is also electrically connected with the
control system. In addition, relevant control device
electrically connected to the control system may be
provided on the operation platform.
The telescopic connection component 5 includes
an outer arm 51, an inner arm 52 slidably disposed inside
the outer arm 51 and capable of being moved out from one
end of the outer arm 51, and a forearm telescopic cylinder
53 disposed between the outer arm 51 and inner arm 52.
It is noted that the forearm telescopic cylinder
53 includes a cylinder body (not shown) and a piston rod
(not shown) slidably disposed into the cylinder body.
Preferably, the cylinder body is secured onto an outer
wall of the outer arm 51, and an extension end of the piston
rod is secured onto an outer wall of the inner arm 52.
A first levelling cylinder 55 is disposed
between the telescopic transmission component 2 and
telescopic connection component 5. A forearm head 54 is
hinged to one end, which is connected to the telescopic
transmission component 2, of the telescopic connection
component 5. One end of the first levelling cylinder 55
11194592_1 (GHMatters) P106231.NZ
is hinged to the telescopic transmission component 2,
while the other end thereof is hinged to the forearm head
54. The telescopic connection component 5 further
includes a forearm luffing cylinder 57 one end of which
is hinged to the forearm head 54, while the other end
thereof is hinged to the outer wall of the outer arm 51.
By this means, the forearm head 54, outer arm 51 and
forearm luffing cylinder 57 constitute a triangle luffing
mechanism.
It is noted that the forearm head 54, outer arm
51 and telescopic transmission component 2 are hinged
together by a pin 512. The first levelling cylinder 55,
forearm head 54, forearm luffing cylinder 57 and outer
arm 51 constitute a four-bar linkage. Moreover, the first
levelling cylinder 55 may operate electrically or
hydraulically. In case operating under electric manner,
an angle sensor (not shown) matched with the first
levelling cylinder 55 is installed on the pin 512 which
hinges the forearm head 54, outer arm 51 and telescopic
transmission component 2 together. In case operating
under hydraulic manner, a hydraulic levelling device
matched with the first levelling cylinder 55 is disposed
on the telescopic transmission component 2. Preferably,
the first levelling cylinder 55 works in electrical
levelling manner.
11194592_1 (GHMatters) P106231.NZ
Here, the forearm head 54 may be leveled by
pushing and pulling motion of the first levelling
cylinder 55 upon the head 54. Specifically, an angle
sensor installed on the forearm head 54 sets an angle of
the head 54 as zero. During luffing of the telescopic
transmission component 2, the forearm head 54 will tilt
accordingly. As a result, angle signal of the forearm head
54 will be sent to a corresponding controller through the
angle sensor. After receiving the signal, the controller
will generate a corresponding command to cause telescopic
motion of the first levelling cylinder 55, thereby
realizing levelling of the forearm head 54. In other words,
the forearm head 54 is controlled to be oriented at its
predefined zero angle. In addition, up and down luffing
of the telescopic connection component 5 may also be
realized by telescopic movement of the forearm luffing
cylinder 57.
Furthermore, a third levelling cylinder 58 is
disposed between the telescopic connection component 5
and operation platform 3. One end of the third levelling
cylinder 58 is hinged to the inner arm 52, whereas the
other end thereof is hinged to a rotary cylinder 33
secured onto the operation platform 3.
Preferably, a second levelling cylinder 56 is
positioned between the forearm head 54 and telescopic
11194592_1 (GHMatters) P106231.NZ
connection component 5. One end of the second levelling
cylinder 56 is hinged to the forearm head 54, while the
other end thereof is hinged to the outer wall of the outer
arm 51. A cavity of the second levelling cylinder 56
communicates with a cavity of the third levelling
cylinder 58 by means of an oil tube.
It is noted that arrangement of the second
levelling cylinder 56 and third levelling cylinder 58
avoids tilting of the operation platform 3 during luffing
of the telescopic connection component 5. In other words,
the operation platform 3 is always maintained at a
horizontal location during luffing of the telescopic
connection component 5. Accordingly, the second
levelling cylinder 56 and third levelling cylinder 58
have a second level of levelling function (the first
levelling cylinder 55 and associated device realize a
first level of levelling function). As the cavity of the
second levelling cylinder 56 communicates with that of
the third levelling cylinder 58 by means of an oil tube,
levelling may be achieved by adjusting telescopic motion
of the second and third levelling cylinders 56 and 58.
The detailed levelling processing is described below.
When the telescopic connection component 5 luffs upwardly,
a telescopic rod of the forearm luffing cylinder 57 comes
out and at the same time, a telescopic rod of the second
11194592_1 (GHMatters) P106231.NZ
levelling cylinder 56 also comes out. At this time,
hydraulic medium inside a rod chamber of the second
levelling cylinder 56 flows under pressure into a rod
chamber of the third levelling cylinder 58. Next, a
telescopic rod of the third levelling cylinder 58
retracts, and hydraulic medium contained inside the
non-rod chamber of the third levelling cylinder 58 flows
into a non-rod chamber of the second levelling cylinder
56 through an oil tube so as to realize levelling by
balancing pressure inside relevant chambers of the second
and third levelling cylinders 56 and 58. This principle
also applies when the telescopic connection component 5
luffs downwardly except for flowing direction of
hydraulic medium and movement direction of relevant
components. Here, cross section areas of the cylinders,
telescopic rods of the second and third levelling
cylinders 56 and 58, and traveling distances of the
telescopic rods thereof are predefined and matched among
each other.
Reference is made to figures 1-12 illustrating
a typical embodiment of a telescopic transmission
component of the aerial work platform of the invention.
The telescopic transmission component 2 includes a base
arm 21, a second arm 22, a third arm, a telescopic cylinder
24, a rope-expanding chain 27, and a rope-retracting
11194592_1 (GHMatters) P106231.NZ
chain 28.
The second arm 22 is inserted into the base arm
21 and is able to move out of the base arm 21 (See an upper
portion of figure 7). The third arm 23 is inserted into
the second arm 22 and is capable of coming out of an
extension end of the same (See an upper portion of figure
The telescopic cylinder 24 includes a cylinder
barrel 241 secured onto the second arm 22 and a telescopic
rod 242 inserted into the barrel 241. The telescopic rod
242 has a hollow arrangement 247 communicating with a
cavity of the cylinder barrel 241. An oil guiding tube
245 is provided into the hollow arrangement 247 of the
telescopic rod 242, and the extension end of the
telescopic rod 242 is secured onto the base arm 21 (See
a lower portion of figure 9). Preferably, an end surface
of the extension end of the telescopic rod 242 is fixed
to the base arm 21 through a mounting plate 8. A connection
portion is provided on the cylinder barrel 241 at a
location adjacent to the extension end of the telescopic
rod 242 for securing the barrel 241 to the second arm 22.
The connection portion may in the form of an axle hole.
That is, the cylinder barrel 241 may be mounted on the
second arm 22 by inserting a pin into said axle hole. Of
course, the connection portion of the barrel 241 may also
11194592_1 (GHMatters) P106231.NZ
be designed to locate at other positions of the barrel
241, for example at a middle position.
Moreover, a first sprocket wheel 25 is provided
on the telescopic cylinder 24, a second sprocket wheel
26 is provided on the second arm 22, and the second
sprocket wheel 26 is closer to the extension end of the
cylinder barrel 241 than does the first sprocket wheel
. One end of the rope-expanding chain 27 is attached
onto the base arm 21, while the other end thereof runs
around the first sprocket wheel 25 and then is attached
onto the third arm 23. In other words, the two ends of
the rope-expanding chain 27 are both located below the
first sprocket wheel 25(See orientation of figures). One
end of the rope-retracting chain 28 is attached onto the
third arm 23, while the other end thereof runs around the
second sprocket wheel 26 and then is attached onto the
base arm 21. In other words, the two ends of the
rope-retracting chain 28 are both located above the
second sprocket wheel 26(See orientation of figures).
Preferably, the first sprocket wheel 25 is located on a
cylinder head, which cylinder head is located at one end
away from an extension end, of the telescopic cylinder
24. The second sprocket wheel 26 is located on the second
arm 22 at a location adjacent to the extension end of the
telescopic rod 242. By this manner, the first and second
11194592_1 (GHMatters) P106231.NZ
sprocket wheels 25 and 26 are capable of being positioned
above and below the cylinder barrel 241(See orientation
of figures). This ensures stable movement of the cylinder
barrel 241 and accordingly, it also ensures stable
rotation and telescopic motion of relevant components.
Of course, the first and second sprocket wheels 25 and
26 may also be positioned at other suitable locations.
For instance, the first sprocket wheel 25 may be located
at a middle area of the cylinder barrel 241, and the second
sprocket wheel 26 may be placed on the second arm 22 at
a location close to a middle portion of the cylinder
barrel 241.
As shown in figures 11-12, an inner cavity of
the cylinder barrel 241 of the telescopic cylinder 24 is
separated to form a rod chamber 244 and a non-rod chamber
243. In other words, partial space of the inner cavity
of the barrel 241 overlaps the telescopic rod 242 and thus
forms the rod chamber 244. Partial space of the inner
cavity of the barrel 241 doesn’t overlap the rod 242 and
locates at a upper right side (See figure 12) of a distal
end of the telescopic rod, and accordingly, forms the
non-rod chamber 243. The hollow arrangement 247 of the
telescopic rod 242 communicates with the rod chamber 244
via a connection path 246. The hollow arrangement 247 of
the rod 242 together with the oil guiding tube 245 inside
11194592_1 (GHMatters) P106231.NZ
the arrangement 247 is communicated with an external oil
tube
Furthermore, one end of the rope-retracting
chain 28 is attached onto the third arm 23 by means of
a chain connection member 29, similarly, one end of the
rope-expanding chain 27 is also attached onto the third
arm 23 by means of the chain connection member 29, and
the two ends are located at two sides of the chain
connection member 29. By this manner, motions of the
rope-expanding chain 27, rope-retracting chain 28 and
third arm 23 are coordinated among each other.
Alternatively, the rope-expanding chain 27 and
rope-retracting chain 28 may be connected to the third
arm 23 with different connective members.
Moreover, a chain detection device is provided
on the rope-expanding chain 27 for real time detecting
status of related chain. When a chain is broken or exceeds
a predefined loose value, the chain detection device will
generate alert signals to guarantee safety of the
telescopic transmission component 2, and further
guarantee safety of operators and other staff. In
particular, the chain detection device may be disposed
on the rope-expanding chain 27 at one end thereof where
the chain 27 is connected to the base arm 21.
Preferably, all of the base arm 21, second arm
11194592_1 (GHMatters) P106231.NZ
22 and third arm 23 are of hollow arrangement. It is noted
that these arms are by no means limited to this hollow
arrangement, and in fact they may be of other
constructions.
Furthermore, these hollow arrangements of the
base arm 21, second arm 22 and third arm 23 form a
telescopic cavity into which the telescopic cylinder 24,
first sprocket wheel 25, second sprocket wheel 26,
rope-expanding chain 27 and rope-retracting chain 28 are
received, thus leading to a compact structure for the
telescopic transmission component 2, and further
reducing wear and aging of the components, thereby
extending lifetime. This also reduces repair and
maintenance frequency and makes it more convenient to
repair and maintain the same, thus decreasing related
costs. In addition, to certain extent these components
are not exposed outside and accordingly, risk of
operators being injured due to unintentional collision
with the components is also reduced. Of course, it is also
feasible to place the telescopic cylinder 24, first
sprocket wheel 25, second sprocket wheel 26,
rope-expanding chain 27 and rope-retracting chain 28
outside the telescopic cavity (that is, place them onto
the outer walls of the base arm 21, second arm 22 and third
arm 23).
11194592_1 (GHMatters) P106231.NZ
In a summary, as the telescopic rod 242 is
secured onto the base arm 21, when driven by suitable
liquid medium, the cylinder barrel 241 will move upwardly
together with the second arm 22 such that the second arm
22 will move out of the base arm 21. In turn, under the
traction of the rope-expanding chain 27 and first
sprocket wheel 25, the third arm 23 is pulled to move out
of an upper end of the second arm 22. With continuous
injection of the liquid medium into the cylinder barrel
241, the second arm 22 and third arm 23 will continue to
move toward the upper end until desired travel distance
or maximum predefined distance is reached. During this
movement, the first sprocket wheel functions as a movable
pulley, and in this situation, displacement of the third
arm 23 relative to the base arm 21 is two times as long
as a travel distance of the cylinder barrel 241 (the
distance of the second arm 22 with respect to the base
arm 21). In this case, telescopic distance is certainly
extended.
When oil enters the rod chamber 244 of the
cylinder barrel 241 through the hollow arrangement 247
of the telescopic rod 242, the barrel 241 will drive the
second arm 22 to move together downwardly such that the
second arm 22 will retract from the upper end of the base
arm 21. In turn, the third arm 23 will retract into the
11194592_1 (GHMatters) P106231.NZ
second arm 22 when driven by the rope-retracting chain
28 and second sprocket wheel 26. With continuous oil
injection into the telescopic rod 242, the second arm 22
and third arm 23 will continuously retract towards a low
end until a desired retracting location or complete
retracting location is reached. During this retracting,
the second sprocket wheel 26 works as a movable pulley
such that the displacement of the third arm 23 relative
to the base arm 21 is two times as long as the travel
distance of the cylinder barrel 241 (that is, the distance
of the second arm 22 relative to the base arm 21).
Specifically, please refer to figure 1 and other
related figures, the third arm 23 is hinged to the
operation platform 3 by said telescopic connection
component 5. In other words, the third arm 23 is hinged
to the outer arm 51 of the telescopic connection component
, and the inner arm 52 of the component 5 is connected
with the operation platform 3. The telescopic connection
component 5 helps the operation platform 3 move further
along a horizontal direction. The base arm 21 is hinged
to the vehicle 1 by the supporting arm 4 which is movably
connected with relevant component of the vehicle 1. In
addition, a luffing cylinder 6 is disposed between the
base arm 21 and supporting arm 4. By this manner, the base
arm 21, supporting arm 4 and luffing cylinder 6 connected
11194592_1 (GHMatters) P106231.NZ
therewith also together define a reliable triangle
construction. This makes sure that the aerial work
platform bears more stability and security.
When the aerial work platform requires extending
its arms, the second and third arms 22, 23 of the
telescopic transmission component 2 are controlled to
extend. At this time, the operation platform 3 coupled
with the telescopic transmission component 2 will also
be extended when driven by the third arm 23. At this time,
relevant luffing cylinder 6, supporting arm 4 and
telescopic connection component 5 are also controlled to
adjust angle or location of relevant arms until the
operation platform 3 moves to a predefined working
location or a maximum extension distance is reached.
Similarly, when the aerial work platform
requires withdrawing its arms, the second and third arms
22, 23 of the telescopic transmission component 2 are
controlled to retract. At this time, the operation
platform 3 coupled with the telescopic transmission
component 2 will also be retracted when driven by the
third arm 23. At this time, relevant luffing cylinder 6,
supporting arm 4 and telescopic connection component 5
are also controlled to adjust angle or location of
relevant arms until the operation platform 3 moves to a
predefined working location or returns to its original
11194592_1 (GHMatters) P106231.NZ
location without extension.
Moreover, please refer to figure 13 which
illustrates another example of an aerial work platform
of the invention. This example is different from the above
example in that: a luffing cylinder 57 in place of
relevant first level of levelling components of the above
example and serving as a supporting member is disposed
between the telescopic transmission component 2 and
telescopic connection component 5; and the third
levelling cylinder 58 works in an electrical levelling
manner other than hydraulic levelling manner as described
in above example, that is, an angle sensor 59 cooperating
with the third levelling cylinder 58 is provided on the
rotary cylinder 33.
When in operation, up and down luffing action
of the telescopic connection component 5 is realized by
telescopic motion of the luffing cylinder 57 located
between the telescopic transmission component 2 and
telescopic connection component 5. Levelling of the
operation platform is conducted by telescopic motion of
the third levelling cylinder 58, thus ensuring all time
horizontal orientation of the platform.
Specifically, an angle sensor 59 installed on
the rotary cylinder 33 sets a location of the operation
platform 3 as zero. During luffing motion of the
11194592_1 (GHMatters) P106231.NZ
telescopic connection component 5, this angle sensor 59
will transmits electrical signals to a corresponding
controller which when receives the signals, will send
control command to cause telescopic motion of the third
levelling cylinder 58, hence realizing levelling of the
operation platform. In other words, it is maintained that
the operation platform is always in its zero location.
In a summary, the telescopic connection
component has longer horizontal reach so that the
operation platform is capable of moving to a further
region in a horizontal direction, thus increasing working
range of the aerial work platform. In addition, the
telescopic connection component has higher structural
strength and stability and accordingly, it also improves
safety of the aerial work platform.
Though various embodiments of the present
invention have been illustrated above, a person of the
art will understand that, variations and improvements
made upon the illustrative embodiments fall within the
scope of the present invention, and the scope of the
present invention is only limited by the accompanying
claims and their equivalents.
11194592_1 (GHMatters) P106231.NZ
Claims (5)
1. An aerial work platform, comprising a vehicle, a telescopic transmission component, a telescopic connection component, and an operation platform all of which are movably connected with each other in sequence; the telescopic connection component comprises: an outer arm, an inner arm slidably disposed inside the outer arm and capable of being moved out from one end of the outer arm, and a forearm telescopic cylinder disposed between the outer arm and inner arm; the cylinder body is secured onto an outer wall of the outer arm, and an extension end of the piston rod is secured onto an outer wall of the inner arm; a supporting member is disposed between the vehicle and telescopic transmission component, and another supporting member is placed between the telescopic transmission component and telescopic connection component; the supporting member disposed between the telescopic transmission component and telescopic connection component is a first levelling cylinder; one end, which is connected to the telescopic transmission component, of the telescopic connection component, is hinged to a forearm head; and one end of the first levelling cylinder is hinged to the telescopic transmission component, while the other end is hinged to the forearm head; and the forearm head, outer arm and telescopic transmission component are hinged together 11194592_1 (GHMatters) P106231.NZ by a pin.
2. The aerial work platform as recited in claim 1, wherein the telescopic connection component further comprises a forearm luffing cylinder one end of which is hinged to the forearm head, while the other end thereof is hinged to the outer wall of the outer arm; and by this means, the forearm head, outer arm and forearm luffing cylinder constitute a triangle luffing mechanism.
3. The aerial work platform as recited in claim 2, wherein a third levelling cylinder is disposed between the telescopic connection component and operation platform; and one end of the third levelling cylinder is hinged to the inner arm, whereas the other end thereof is hinged to a rotary cylinder secured onto the operation platform.
4. The aerial work platform as recited in claim 3, wherein an angle sensor cooperating with the third levelling cylinder is provided on the rotary cylinder.
5. The aerial work platform as recited in claim 3, wherein a second levelling cylinder is positioned between the forearm head and telescopic connection component; one end of the second levelling cylinder is hinged to the forearm head, while the other end thereof is hinged to the outer wall of the outer arm; and a cavity 11194592_1 (GHMatters) P106231.NZ of the second levelling cylinder communicates with a cavity of the third levelling cylinder by means of an oil tube. 11194592_1 (GHMatters) P106231.NZ
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610726254.0A CN106395697B (en) | 2016-08-24 | 2016-08-24 | Expansion joint assembly and aerial work platform |
CN2016107262540 | 2016-08-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ733244A NZ733244A (en) | 2019-08-30 |
NZ733244B true NZ733244B (en) | 2019-12-03 |
Family
ID=
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