NZ759928B2 - Anti-extrusion device and aerial work platform - Google Patents
Anti-extrusion device and aerial work platform Download PDFInfo
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- NZ759928B2 NZ759928B2 NZ759928A NZ75992819A NZ759928B2 NZ 759928 B2 NZ759928 B2 NZ 759928B2 NZ 759928 A NZ759928 A NZ 759928A NZ 75992819 A NZ75992819 A NZ 75992819A NZ 759928 B2 NZ759928 B2 NZ 759928B2
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- Prior art keywords
- detecting rod
- plate
- guard
- detecting
- hinged seat
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- 238000001125 extrusion Methods 0.000 title claims abstract description 29
- 230000001939 inductive effect Effects 0.000 claims description 8
- 230000001681 protective Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000002965 rope Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000001960 triggered Effects 0.000 description 3
- 240000003139 Ferula foetida Species 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000126 Latex Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003139 buffering Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The present disclosure relates to the technical field of anti-extrusion systems, in particular to an anti-extrusion device and an aerial work platform. It includes an operation platform guard for a guard rail mounted on an aerial work platform, the operation platform guard is movably connected to at least one detecting rod for the human body to lean on, and the detecting rod is provided with a position change sensing means for triggering an alarm system. The operation platform guard is fixed with a hinged seat for hinging the detecting rod. The hinged seat forms a semi-enclosed guiding section used for stable guiding of the detecting rod when moving without swaying up and down. The present detecting rod is able to trigger the alarm system with less risk of injuring the operator than prior art solutions. least one detecting rod for the human body to lean on, and the detecting rod is provided with a position change sensing means for triggering an alarm system. The operation platform guard is fixed with a hinged seat for hinging the detecting rod. The hinged seat forms a semi-enclosed guiding section used for stable guiding of the detecting rod when moving without swaying up and down. The present detecting rod is able to trigger the alarm system with less risk of injuring the operator than prior art solutions.
Description
ANTI-EXTRUSION DEVICE AND AERIAL WORK PLATFORM
TECHNICAL FIELD
The present disclosure relates to the technical field of anti-extrusion systems, and in
particular to an anti-extrusion device and an aerial work platform.
BACKGROUD
Aerial work platforms are used more and more frequently in today's society, and
more attention is paid on its safety. In particular, when obstacles appear on the top or rear
of the platform, and when it is likely that the operator ignores and the machine continues
to rise, the worker may be squeezed by the obstacle. The machine may continue to lift
due to the operator's inability to release the operating handle in time, eventually causing a
more serious accident, etc., in the prior art. There is such a safety facility against
squeezing existing in the prior art.
For example, the work platform anti-extrusion system and the aerial work platform
are disclosed in Chinese Patent with Publication No. CN208249834U, the work platform
anti-extrusion system is provided on the work platform, and the work platform includes
an operation platform, and an anti-extrusion drawstring located at the rear side of the
work platform and connected to the work platform at its both ends. At least one end of the
anti-extrusion drawstring is connected with a rope switch disposed on the work platform,
the rope switch is connected to the upper controller, the upper controller has a platform
movement stop module. The utility model has the advantages that: the anti-extrusion
drawstring connected with the rope switch detects the squeezed condition, the detection
mode is contact type, and is not easy to be triggered by mistake. But the structure is easy
to injure the human body, and the structures of the rope switch and the drawstring are
easy to be damaged with poor recovery;
A work platform for preventing continuous involuntary operation disclosed in
Chinese Patent with Publication No. CN107257773A, comprises: a floor structure having
a width dimension and a depth dimension; and a safety barrier coupled to the floor
structure, a control panel area being capable to cooperates with the safety barrier and
including a sensor support rod having a top crossbar extending along the width
dimension, and a side bar extending substantially perpendicularly from the top crossbar,
each of the side bars includes an upper portion extending inwardly from the top crossbar
along the depth dimension to a curved portion, and a lower portion extending outwardly
from the curved portion along the depth dimension to the safety barrier, configured to be
a platform switch that trips when a predetermined force is applied is attached to the
sensor support rod through a switch rod, the switch rod is held by the shearing element.
The entire structure is a fixed structure, and the rigidity is large, especially when there is
a large pressing force, it can alert, the impact on the person is still large, and the position
of the human body is limited, the risk-avoiding effect is not good enough.
SUMMARY
One object of the present disclosure is to provide a safer anti-extrusion.
The above technical object of the present disclosure is achieved by the following
technical solutions: an anti-extrusion device is provided, including an operation platform
guard for a guard rail mounted on an aerial work platform, the operation platform guard
is movably connected to at least one detecting rod for the human body to lean on, and the
detecting rod is provided with a position change sensing means for triggering an alarm
system.
Regarding the above solution, when the operator is or is about to be squeezed, the
operator can push the detecting rod through the leaning of the body, so that the position
of the detecting rod changes to notify the alarm system that the operator is in danger. In
the situation, the continuous operation of the work platform is then shut down, and the
change of the position information of the detecting rod is detected by the position change
sensing means and fed back to the alarm system, so that the human body can not only
have a certain safe movement space, but also alarm can be effective and safety is
improved.
As a preferred aspect of the present disclosure, the detecting rod is rotatably coupled
to the operation platform guard.
As a preferred aspect of the present disclosure, the operation platform guard is fixed
with a hinged seat for hinging the detecting rod.
As a preferred aspect of the present disclosure, the hinged seat is mounted with a
limit device for limiting the detecting rod.
As a preferred aspect of the present disclosure, the limiting device includes a front
limiting block for restricting the detecting rod from swinging toward the operation
platform, and a rear limiting plate for restricting the detecting rod from swinging toward
the operator; between the front limiting block and the rear limiting plate, a free movable
interval for the detecting rod to swing is provided.
As a preferred aspect of the present disclosure, the rear limiting plate is part of the
hinged seat.
As a preferred aspect of the present disclosure, the hinged seat is mounted with an
elastic reset device for resetting the detecting rod.
As a preferred aspect of the present disclosure, the detecting rod abuts against the
rear limiting plate.
As a preferred aspect of the present disclosure, the anti-extrusion device has two
detecting rods that are opposite to each other and are provided with position change
sensing means at opposite ends.
As a preferred aspect of the present disclosure, the position change sensing means
on one of the detecting rods is a magnetic inductive switch, and the position change
sensing means on the other detecting rod is a magnetic block.
As a preferred aspect of the present disclosure, at least a portion of a surface of the
detecting rod is an arcuate portion that is in contact with the operator.
As a preferred aspect of the present disclosure, an outer portion of the detecting rod
is wrapped with a buffer layer.
Another object of the present disclosure is to provide a higher security aerial work
platform.
The above technical object of the present disclosure is achieved by the following
technical solutions: an aerial work platform is provided, it has a base for an operator to
stand and a guard rail mounted on the base, the guard rail is mounted with the
aforementioned anti-extrusion device.
Advantageous effects of the present disclosure is listed as below:
The structure of the present application is higher in safety, the correctness of the
alarm triggering is higher, the protection of the human body and the equipment itself is
better in the anti-squeeze and risk avoidance process, the stability and restorative
property of the structure are better, and not easy to damage during long-term use.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial perspective view of the anti-extrusion device mounted on an aerial
work platform of Embodiment 1 according to the present disclosure ;
Fig. 2 is an enlarged view of Portion I in Fig. 1;
Fig. 3 is a partial perspective structural view showing a region where the detecting
rod 2 is located, which is observed from the front side view of Embodiment 1 according
to the present disclosure.
Fig. 4 is a schematic perspective view of Embodiment 4 according to the present
disclosure.
In the figures:
1, operation platform guard; 2, Detecting rod; 3, Position change sensing means; 4,
Hing seat; 5, Limiting device; 51, Front limiting block; 52, Rear limiting plate; 512, Free
movable interval; 6, Elastic reset device; 20, Buffer layer; a1, operation platform; 10,
Guard frame; 11, Guard rod; 40, Hinged shaft; 400, Semi-enclosed guiding section; 41,
Side plate; 42, Upper plate; 43, Lower plate; 4a, Upper rotating plate; 4b, Lower rotating
plate; 4c, Side rotating plate; 60, Torsion spring; 7, Base; 8, Guard rail.
DETAILED DESCRIPTION OF EMBODIMENTS
The following specific embodiments are merely illustrative of the present disclosure,
and are not intended to limit the present disclosure. Those skilled in the art can make
modifications to the present embodiment that are not creatively contributed as needed
after reading the present specification, but they are protected by patent law when falling
into the scope of the appendix claims.
Embodiment 1
An anti-extrusion device is provided, it includes an operation platform guard 1 for a
guard rail mounted on an aerial work platform, the operation platform guard 1 can adopt
an existing conventional guard, and an operation platform a1 is disposed in the protection
area of the guard. The operation platform guard 1 can be movably connected with at least
one detecting rod 2 for the human body to lean on, and one or two or even more detecting
rods can be selected. These detecting rods 2 are initially kept still, when an abnormal
situation occurs, for example, it is squeezed by an obstacle, the operator can touch the
detecting rod 2 and push a distance to generate a position change. The detecting rod 2 is
mounted with a position change sensing means 3 for triggering an alarm system, the
position change sensing means 3 can issue a position change information to the alarm
system to shut down the work platform, and can perform an alarm through devices such
as an audible alarm and a light alarm, so that the squeezed condition can be timely dealt.
The position change sensing means 3 can be connected to the alarm system through wired
or wireless means, and trigger the alarm system by feedback position information change.
The detecting rod 2 may enables it to move between the operator and the operation
platform. The design can, on one aspect, make the operator leans forward and leans down
more conveniently and homeopathically; on the other aspect, the front side area is the
area of the operation platform guard 1, it not only has a space for people to move
forward, but also a cover for operating the platform guard 1, which can further improve
safety.
The manner of the movable connection of the detecting rod 2 and the operation
platform guard 1 can be directly realized by a compression connection structure such as a
spring or a cylinder, and the initial state can be kept still. The operator can directly push
the detecting rod 2 to be compressed or the cylinder, thereby the position of the detecting
rod 2 is offset to alarm and shut down the work platform, and when the operator returns
to the normal state after the emergency state eliminated. The detecting rod 2 can be
effectively reset, but the simple structure is insufficient in stability. It is easy to be
damaged, and it may cause abnormality of the detecting rod 2 or the position change
sensing means 3, or there is a certain safety hazard.
A more reliable connection method is preferred in this embodiment. As shown in
the detecting rod 2 is mounted on the operation platform guard 1 by means of a
rotational connection, and preferably through the end portion of the detecting rod 2, to
make the structure of rotational connection realized. The existing operation platform
guard 1 is generally composed of two left and right guard frames 10 and a guard bar 11
which is bridged between the two guard frames 10 and is located above the two. One end
of the detecting rod 2 is rotatably connected to one of the guard frames 10, so that the
detecting rod 2 can be rotated around the guard frame 10. Further preferably, the
operation platform guard 1 is fixed with a hinged seat 4 for hinging the detecting rod 2,
the hinged seat 4 is mounted on the guard frame 10, and the hinged shaft 40 on the hing
seat 4 may preferably be such that the positional offset is formed through the detecting
rod 2 rotates around the hinge shaft 40 in a horizontal area or in a downwardly inclined
area or in a vertically downward area. Furthermore, the hinged seat 4 is mounted with a
limiting device 5 for limiting the detecting rod 2, and the movement range of the
detecting rod 2 is limited by the limit of the limiting device 5, such that the rotation of the
detecting rod 2 is merely a swing maintained within a certain range, that is, a position that
restricts the initial state of the detecting rod 2 to an offset end position after the position
of the detecting rod 2 is changed when the operator is in a squeezed state. Surely, the
detecting rod 2 needs to be reset to the position of the initial state after the alarm ends, so
the detecting rod 2 is capable of swinging back and forth between the two positions.
Specifically, preferably, the embodiment has a swinging manner of the detecting rod
2 in the area of the horizontal plane or in the area close to the horizontal plane. The
hinged seat 4 may specifically include a side plate 41 fixedly mounted with the guard
frame 10, and an upper plate 42 and a lower plate 43 integrally connected to the upper
portion and the lower portion of the side plate respectively. The side plate 41, the upper
plate 42 and the lower plate 43 are preferably located in a protective area between the left
and right two guard frames 10 and the three are surrounded to form a semi-enclosed
guiding section 400 used for the stable guiding of the detecting rod 2 when moving, and
does not sway up and down. The upper plate 42 and the lower plate 43 are provided with
the above-mentioned hinge shaft 40 extending upward and downward, and the hinge
shaft 40 can directly pass from top to bottom through the detecting rod 2 and are
connected in the end, but this connection is not conducive to the connection of the reset
device described later, as shown in Figures 2 and 3.
Thus, preferably, a new hinged structure of the detecting rod 2 is further provided.
That is, a rotating member is further added, the rotating member includes an upper
rotating plate 4a and a lower rotating plate 4b, and a side rotating plate 4c integrally
connected between the upper rotating plate 4a and a lower rotating plate 4b. The hinge
shaft 40 passes from top to bottom through the upper rotating plate 4a and the lower
rotating plate 4b, and the rotating member is disposed between the upper plate 42 and the
lower plate 43 and can be rotated around the hinge shaft 40. The detecting rod 2 is
preferably fixed to the side rotating plate 4c, so that the detecting rod 2 can move
together with the rotating member. The detecting rod 2 can be fixed to the side rotating
plate 4c by welding or socketing.
Preferably, the limiting device 5 includes a front limiting block 51 for restricting the
detecting rod 2 from swinging toward the operation platform, and a rear limiting plate 52
for restricting the detecting rod 2 from swinging toward the operator. There is a free
movable interval 512 for the detecting rod 2 to swing between the front limiting block 51
and the rear limiting plate 52. Wherein, one of the front limiting blocks 51 may be
integrally connected to the lower side of the upper plate 42 on the same hinge shaft 40, or
one of the front limiting blocks 51 may be integrally connected to the upper side of the
lower plate 43, or each of the front limiting blocks 51 is respectively integrally connected
to the lower side of the plate 42 and the upper side of the lower plate 43 and vertically
opposed to each other. The free movable interval 512 is such that the end of the detecting
rod 2 or the rotating member can has a swingable space that can be rotated at the hinge
shaft 40, and at the same time, the limits of initial state position and the end position are
obtained at the rear limiting plate 52 and the front limiting block 51, for example, when
the rotating member is used, both the upper rotating plate 4a and the lower rotating plate
4b of the rotating member may have a rear side edge that abuts against the rear limiting
plate 52 and a front side edge that abuts against the front limiting block 51, or these two
limiting movements are accomplished by the rear side edge and the front side edge of the
side rotating plate 4c.
Preferably, the rear limiting plate 52 is a part of the hinged seat 4, and the rear
limiting plate 52 may be integrally connected to the rear side portions between the upper
plate 42 and the lower plate 43. The hinged seat 4 and the rotating member may be made
of a hard material structural member such as a metal member or a polymer composite
member.
In order to better keep the detecting rod 2 still in the initial state, and the detecting
rod 2 can be pushed by the operator to the end position and the position change occurs,
thereby alarm is generated, and the detecting rod 2 can be reset and reused. Then, the
hinged seat 4 can be mounted with an elastic reset device 6 for resetting the detecting rod
2. Also preferably, in the initial state, the detecting rod 2 can abut against the rear limiting
plate 52. Surely, the detecting rod 2 can be realized by other reset mechanisms, either
manually or automatically. This embodiment will introduce a simple and effective
implementation subsequently.
Specifically, the elastic reset device 6 includes a torsion spring 60 sleeved on the
periphery of the hinge shaft 40. For example, if the hinged seat 4 is mounted on the left
side of the guard frame 10, the side plate 41 is then fixed with the guard frame 10. The
semi-enclosed guiding section 400 faces to the right, the side rotating plate 4c can be
located on the right side of the side plate 41, the torsion spring 60 is disposed at a
position between the side plate 41 and the side rotating plate 4c, and both ends of the
torsion spring 60 are respectively penetratingly disposed on the side plate 41 and the side
rotating plate 4c. After being connected, at the position of the initial state, the detecting
rod 2 is abutted against the front side position of the rear side limit plate 52 by the elastic
force of one end of the torsion spring 60. However, when the operator needs an alarm, a
certain pushing force is applied, so that the detecting rod 2 generates a position change
toward the front side region to perform an alarm. After the alarm, the detecting rod 2 is
reset depending on the resilience of the torsion spring itself. The structure has the
advantage that the detecting rod 2 needs to resist a certain torsion spring force, it can
prevent false alarms caused by actions such as flicking during normal operation, and can
be effectively reset. The position of the human body has more mobile hedging distance
during forward or downward movement when the human body is squeezed. The
structure, has a good buffering effect, damage to the equipment or the human body will
not occur due to too much impact force. Surely, the outer periphery of the hinge shaft 40
can be sleeved with more than two torsion springs 60 for better force resistant, as shown
in
In addition, the mounting position of the hinged seat 4 and the rotating member or
the like can be inclined forward and downward or arranged downward, so that the
detecting rod 2 can swing forward and downward or just swings downward, which also
has a good usage effect.
Assuredly, when used, it is generally required to operate with an existing foot
switch. When the operator is squeezed, the detecting rod 2 is pushed by leaning, and the
controller in the alarm system receives the information of the position change, and then
controls the work platform to stop all functional movements. Generally, the controller
controls the sound and light alarm to simultaneously emit an audible alarm and a light
alarm to notify relevant personnel to perform the hedging process. The process of work
can be carried out as follows:
Triggering: the detecting rod 2 is pushed to change the position and notify the
controller in the alarm system, and the controller stops the movement of the work
platform. At the same time, signals of the operation platform needs to be shielded;
Resetting: The reset state of the detecting rod 2 and the state of the foot switch can
also be detected by the controller. If the detecting rod 2 is restored from the squeezed
state to the normal initial state, and then foot switch is restored from the pedaling state to
the non-pedaling state, and then entering the pedaling state, the controller begins to
respond to signals from the operation platform.
When triggered, the controller also controls the sound and light alarm to alarm and
detect the working state of the main arm. If the main arm is in the lifting state, the
controller controls the main arm to stop lifting and falls within the predetermined falling
time; if the main arm is at the extended state, the controller controls the main arm to stop
extending and retract within the predetermined retraction time.
Upon recovery, the controller also controls the sound and light alarm to stop the
alarm while beginning to respond to signals from the operation platform.
In addition, when the squeezing situation occurs, the work platform can be able to
descend to a certain height, thereby effectively preventing the worker from being injured;
the recovery step requires successively resetting the detecting rod 2 and the foot switch to
prevent the anti-extrusion system from the wrong recovery after being triggered.
Embodiment 2
On the basis of Embodiment 1, considering the aesthetics, integrity, and reliability of
the structure on the device, the anti-extrusion device preferably has two detecting rods 2
opposite to the left and right. The position change sensing means 3 are disposed at the
opposite ends, and the detecting rod 2 can also be extended in the left and right direction.
For reference, all the drawings in the first embodiment can be referred to.
The two left and right detecting rods 2 can be respectively mounted on the left and
right two guard frames 10 through the mounting structure in Embodiment 1, and the
design is further strengthened in structure. The safety is improved because any one of the
detecting rods 2 is pushed, the alarm can be performed.
The position change sensing means 3 can be embedded in the end of the detecting
rod 2, and the specific implementation scheme has various types, for example:
The position change sensing means 3 on one of the detecting rods 2 is a magnetic
inductive switch, and the position change sensing means 3 on the other detecting rod 2 is
a magnetic block. When any one of the detecting rods 2 is pushed or both of two
detecting rods are pushed, the magnetic inductive switch will switch ON/OFF of the
switch due to the change of position. Because the two are initially close to each other and
have magnetic inductive, as long as one of the detecting rods 2 is pushed, the magnetic
inductive will be weakened or disappeared and to generate a switch of ON/OFF. This
switching information can be fed back to the controller to realize the alarm operation. In
this case, the magnetic inductive switch can be electrically connected to the alarm system
for feedback, because the change information of position of any one of the detecting rods
2 occurs, the change information can be fed back to the alarm system through the
ON/OFF information of the magnetic inductive switch;
Alternatively, a displacement sensor with higher precision may be directly adopted
as the position change sensing means 3, and when the position of the detecting rod 2
changes, it can be fed back to alarm;
Yet alternatively, the position change sensing means 3 on one of the detecting rods 2
may be set as an infrared receiver, and the position change sensing means 3 on the other
detecting rod 2 may be set as an infrared emitter. When the receiving state of the infrared
signal changes, this position change information can be fed back to the alarm where the
infrared receiver can be electrically connected to the alarm system for feedback.
These schemes can be used in different scenarios. For example, the first type is not
recommended in a place with a large magnetic field influence, and the design structure,
selectivity, and applicability can be greatly improved.
Embodiment 3
The difference between this embodiment and the above two embodiments is that,
further to the design of the body of the detecting rod 2, at least a part of the surface of the
detecting rod 2 is an arcuate portion which can be in contact with the operator. Therefore,
the detecting rod 2 may be preferably a long cylindrical shape and has a horizontally-
shaped rod structure, and the use effect is good. For the drawings, reference may be made
to all the drawings in the first embodiment.
In addition, the outer portion of the detecting rod 2 may preferably also be wrapped
with a buffer layer 20. The buffer layer 20 can be made of a flexible material such as
sponge, latex, rubber or plastic to better protect the human body. The body of the
detecting rod 2 can be a metal rod or a rigid plastic rod.
The detecting rod 2 is controlled as much as possible at about 30 cm, and should not
be too long. The swinging distance of the detecting rod 2 is controlled within 15 cm as
much as possible, and the angular range of the swing is controlled within 45 degrees.
Embodiment 4
As shown in an aerial work platform is provided. It has a base 7 for the
operator to stand and a guard rail 8 mounted on the base 7, the guard rail 8 being
mounted on the foregoing embodiment an anti-extrusion device is involved.
The main structure of the embodiment can adopt an existing work platform, and the
difference lies in the installation of the anti-extrusion device of the new design of the
present application.
The above description is only the specific embodiment of the present disclosure, but
the scope of the present disclosure is not limited thereto, and any person skilled in the art
can easily think of various kinds within the technical scope disclosed by the present
disclosure. Equivalent modifications or substitutions are intended to be included within
the scope of the present disclosure. Therefore, the scope of protection of the present
disclosure should be determined by the scope of the claims.
Claims (7)
1. An anti-extrusion device, wherein comprising: an operation platform guard (1) for a guard rail mounted on an aerial work platform; the operation platform guard (1) being movably connected with at least one detecting rod (2) for the human body to lean on, and the detecting rod (2) provided with a position change sensing means (3) for triggering an alarm system; wherein the detecting rod (2) is rotatably connected to the operation platform guard (1); wherein the operation platform guard (1) is fixed with a hinged seat (4) for hinging the detecting rod (2); wherein the hinged seat (4) is provided with a limiting device (5) for limiting the detecting rod (2); the hinged seat (4) comprises a side plate (41) fixedly mounted with a guard frame (10), and an upper plate (42) and a lower plate (43) integrally connected to an upper portion and a lower portion of the side plate (41) respectively; the side plate (41), the upper plate (42) and the lower plate (43) are located in a protective area between a left side and a right side of the guard frame (10), and the side plate (41), the upper plate (42) and the lower plate (43) are joined together to form a semi-enclosed guiding section (400) used for a stable guiding of the detecting rod (2) when moving without swaying up and down; the upper plate (42) and the lower plate (43) are provided with a hinge shaft (40) extending upward and downward, and the hinge shaft (40) is configured to directly pass from top to bottom through the detecting rod (2); the hinged seat (4) is further provided with a rotating member disposed between the upper plate (42) and the lower plate (43) and rotated around the hinge shaft (40); the rotating member comprises an upper rotating plate (4a), a lower rotating plate (4b), and a side rotating plate (4c) integrally connected between the upper rotating plate (4a) and the lower rotating plate (4b); the hinge shaft (40) is configured to pass from top to bottom through the upper rotating plate (4a) and the lower rotating plate (4b); the detecting rod (2) is fixed to the side rotating plate (4c), such that the detecting rod (2) moves together with the rotating member.
2. The anti-extrusion device according to claim 1, wherein the limiting device (5) comprises a front limiting block (51) for restricting the detecting rod (2) toward the operation platform, and a rear limiting plate (52) for restricting the detecting rod (2) from swinging toward the operator; between the front limiting block (51) and the rear limiting plate (52), a free movable interval (512) for the detecting rod (2) to swing is provided.
3. The anti-extrusion device according to claim 2, wherein the rear limiting plate (52) is part of the hinged seat (4).
4. The anti-extrusion device according to claim 1, wherein the hinged seat (4) is provided with an elastic reset device (6) for resetting the detecting rod (2).
5. The anti-extrusion device according to claim 1, wherein the anti-extrusion device has two detecting rods (2) opposite to each other, and are provided with position change sensing means (3) at opposite ends.
6. The anti-extrusion device according to claim 5, wherein the position change sensing means (3) on one of the detecting rods (2) is a magnetic inductive switch and the position change sensing means (3) on the other detecting rod (2) is a magnetic block.
7. An aerial work platform having a base (7) for an operator to stand and a guard rail (8) mounted on the base (7), wherein: the guard rail (8) is mounted with the anti- extrusion device of any of claims 1 to 6.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910870770.4A CN110562886B (en) | 2019-09-16 | Extrusion preventing device and aerial work platform | |
CN2019108707704 | 2019-09-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ759928A NZ759928A (en) | 2021-03-26 |
NZ759928B2 true NZ759928B2 (en) | 2021-06-29 |
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