JPS63315494A - Hanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to cranes such as jib cranes, which handle cargo by suspending it from a wire suspended from a swinging or lifting arm, Related to hanging devices in which a hanging wire is suspended and supported on an arm, such as a hanging type wall work device that performs work on a wall by suspending a gondola or the like on which a worker rides on a wire suspended from the arm. .

[Prior Art] As an example of the above-mentioned hanging device, a jib crane is known in which a sheave is rotatably attached to the tip of an arm and a wire is wound around the sheave. In this jib crane, the sheave was attached to the arm in a fixed position. In other words, the suspension fulcrum of the suspension wire constituted by the sheave was provided in a fixed position relative to the arm (no literature can be cited).

[Problem that the invention seeks to solve]

However, conventional hanging devices have the following problems.

For example, in the case of a swingable jib crane, even if the swinging arm is stopped at a desired position, the suspended cargo does not stop immediately due to its inertia and swings around, and is also swayed by the wind. Since the cargo cannot be unloaded unless the swinging movement of the hanging cargo stops, it is important to stop the swinging movement of the hanging cargo as quickly as possible in order to carry out cargo handling operations efficiently.

However, with conventional jib cranes, measures are taken to reduce the swinging movement of the suspended load by decelerating the swinging arm and then stopping it to reduce the inertia of the suspended load. requires a high level of skill and is not something that just anyone can do. In this way, with conventional jib cranes, measures have been taken to suppress the swinging movement of the suspended cargo in terms of crane operation, but since the crane itself does not have a function to automatically suppress the swinging movement of the suspended cargo, When a suspended load sways due to operation or wind, it takes a long time for the sway to subside.

On the other hand, even with the above-mentioned suspended wall work equipment, the gondola sways due to the wind, but the reality is that there are almost no measures taken to prevent this from happening, so when it sways, the working posture relative to the wall becomes unstable. , workability tends to deteriorate over a long period of time.

In view of the above-mentioned circumstances, an object of the present invention is to make it possible to stop swinging of a hanging wire caused by swinging of an arm or wind as quickly as possible without requiring special operations.

[Means for solving problems]

A characteristic feature of the suspension device according to the present invention is that the arm on which the suspension wire is suspended is provided with support means for movably supporting the suspension fulcrum of the wire in the horizontal direction.

[Function] In other words, when the wire begins to swing due to the inertial force and wind force associated with the rotation of the arm, the horizontal component of those external forces transmitted through the wire simultaneously causes the hanging fulcrum of the wire to shift. Since it moves in the horizontal direction, compared to when the suspension fulcrum is fixed, the lower end position of the wire when the wire swings to its maximum, that is, the angle formed between the luggage, gondola, etc. and this suspension fulcrum. (amplitude angle) becomes smaller, and the component force that acts as a restoring force in the direction of wire deflection becomes smaller.

This will be explained using drawings. Figure 4 (a) and (
In n), a pendulum is drawn to illustrate the principle. In the figure, (W) indicates a wire, (L) indicates a suspended object such as luggage, and (p) indicates a suspension fulcrum of the wire (W).

In Figure 4 (a), the suspended object (L) is at the hanging fulcrum (p
) is located directly below. In this state, for example, after the arm stops turning toward the left in the figure, the suspended object (L), which moves to the left in the figure due to inertia, is directly below the hanging fulcrum (p). At this time, an inertial force [F] directed toward the left in the figure is still acting on the suspended object (L). Also, this condition is
This appears even when the hanging device is stationary, and at this time, for example, due to the generation of wind, a force [F] directed toward the left in the figure is similarly applied to the suspended object (L). act.

In the state shown in FIG. 4(a), the suspended object (L) starts moving to the left in the figure under the influence of the above-mentioned inertial force and wind force.

On the other hand, the external force acting on the suspended object (L) is the wire (W
) is also transmitted to the hanging fulcrum (P), so the hanging fulcrum (p) starts moving to the left in the figure due to the horizontal component force.

FIG. 4(0) shows when the suspended object (L) reaches the end of its amplitude. At this time, the hanging fulcrum (p) receives the above-mentioned horizontal component force and moves by a distance [d] to the left from the position shown in FIG. 4(a). Therefore, the angle [θ1] that the wire (W) makes with the vertical direction is smaller than the angle [0o] when the hanging fulcrum (p) is in a fixed state, as shown by the two-dot chain line in the figure.

For the suspended object (L) in the state shown in Figure 4 (II), the component of the weight of the suspended object (L) in the tangential direction of its swing locus is the restoring force [FI']. act. This restoring force [t'+'] is the mass of the suspended object (L) [m]
, where the acceleration of gravity is [g], F,' = m − g
From the relational expression of [θ1〈^] mentioned above, the restoring force Fo'=m−g−sino when the hanging fulcrum (p) is in a fixed state.

becomes smaller than

As mentioned above, after the wire and the load suspended from the wire begin to sway, each time the sway is repeated, the restoring force is always smaller than when the suspension fulcrum is fixed, so the sway is It decays faster.

〔Effect of the invention〕

As a result, when carrying out cargo handling work using a swingable jib crane, even if the suspended load sways when the arm swivels and stops, or even if the suspended load sways due to the wind, the shaking itself Since the load is lower than before (it also decays quickly), unloading work can be started quickly, greatly increasing the efficiency of cargo handling work.

On the other hand, in hanging wall work devices, etc., even when the gondola sways due to wind, etc., the sway of the gondola itself is small and attenuates quickly, making it possible to work on walls in a stable posture.

Therefore, it has become possible to provide a suspension device that is excellent in workability and safety as a whole.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings.

As shown in FIG.
) to form a luffing boom type fixed jib crane.

A turning motor (4) is mounted on the turning table (3).

By driving this motor (4), the swivel base (3) is configured to be able to rotate 360 degrees around the vertical axis (P1) of the tower (1).

On the other hand, the base of the hoisting boom (2) is attached to the swivel base (3) so as to be rotatable around the horizontal axis (P2). In addition, the wire (
5) is wound around the winch (6) provided on the swivel table (3).

By swinging the hoisting boom (2) up and down by moving the wire (5) in and out from the motor-driven winch (6), the hoisting hook (7) located at the tip of the hoisting boom (2) is , distance from the center of tower (1) (L
) is configured so that it can be changed. By changing this distance (L), the activation range of the hanging hook (7), which is determined by the rotation of the hoisting boom (2) together with the swivel base (3), can be changed.

The hanging hook (7) is attached to the tip of a hanging wire (W) that is hung around and suspended from a sheave (8) provided at the tip of the hoisting boom (2). The other end of this hanging wire (W) is wrapped around a winch (9) provided on the swivel table (3), and the winch (9) driven by a motor connects the hanging hook (7) to the winch (9).
It is constructed so that it can be moved up and down.

As shown in FIGS. 1 and 2, the sheave (8) that guides the feeding and feeding of the hanging wire is rotatably attached to the housing (10) around the horizontal axis (P3).
is attached to. And this housing (lO
) is rotatable around the vertical axis (P4), and the support shaft (1
1).

Furthermore, this support shaft (11) is rotatable around the horizontal axis (P,), and the frame member (2A
) is attached.

Moreover, a pair of frame members (12) are attached to the support shaft (11).
) are erected, and the pair of frame members (12
The sheave (
A positioning wire (15) is hooked to 8). Although not shown, this wire (15) is pivotally connected to the swivel base (3) directly above the rotation axis (P) of the boom (2) via a damper, and is connected to the boom (2) and , and a pair of frame members (12) constitute a parallel recirculation link mechanism.

Then, after the rotation of the hoisting boom (2) is stopped by attaching the housing (lO) that pivotally supports the sheave (8) so as to be rotatable around the vertical axis (P4), or
The structure is such that the swinging of the wire (W) can be quickly attenuated when the wind is blowing.

In other words, the suspension fulcrum (p) of the suspension wire (W) shown in FIG. 2, which is constituted by this sheave (8), is supported so as to be swingable around the vertical axis (P4). ,
If we consider the area from this hanging fulcrum (p) to the load (L) suspended from the hanging hook (7) as a pendulum, the undulating boom (2 ) The hanging fulcrum (p) is configured to be movable in the horizontal direction in response to a horizontal force [F] such as inertia force or wind force accompanying the rotation of the crane.

When the load (L) swings to the left in the figure in response to an external force [F] in the horizontal direction, the horizontal component of this force transmitted via the wire (W) causes the hanging fulcrum (p ) also moves to the left in the figure, so in the state shown in Figure 4 (o) where the amplitude of this pendulum is maximum, the angle [θl] that the wire (W) makes with the vertical direction is changed from the hanging fulcrum ( The angle [θ. ], thereby restoring force acting on the load (L) [F, °]
can be made smaller.

Therefore, by reciprocating the hanging fulcrum (p) in the horizontal direction with the repeated swinging of the wire (W), the restoring force that constantly acts on the load (L) is reduced, and the damping of the swinging is accelerated. It is possible.

In other words, the configuration in which the housing (10) that pivotally supports the sheave (8) is rotatably mounted around the vertical axis (P4) allows the hanging fulcrum (P) of the wire (KA) to move freely in the horizontal direction. It constitutes a support means (SM) that supports the

In addition, by attaching the support shaft (11) to the hoisting boom (2) so as to be able to freely rotate around the horizontal axis (P,), the housing (lO) can be swung regardless of the ups and downs of the hoisting boom (2). With the axis (P4) in a vertical position, insert the wire (
The structure is such that the hanging fulcrum (p) of W) can be moved smoothly in the horizontal direction.

At this time, the housing (10) is attached to the cargo (L).
With the load of , it receives a force that causes it to rotate clockwise in the figure around the axis (P), but this force is absorbed by the boom (2), a pair of frame members (I2), etc. that form the parallel rotation link. By countering this with the tensile force of the wire (15), the swing axis (P4) of the housing (10) can maintain a vertical posture.

Furthermore, the support shaft (11) is rotatable around the horizontal axis (P,), and rotation in the counterclockwise direction in the figure is allowed by loosening the wire (15). Due to the fact that a damper installed in the wire attachment part allows a slight rotation in the clockwise direction in the figure, the wire (W ) in the up-and-down direction, as well as the attenuation of the wind-induced sway in this direction.

Next, the support means (SM) in the above-mentioned jib crane
We will describe an experiment comparing the damping time of sway for an open wire (open wire) using a model with a conventional configuration.

The experimental model (M) was mounted on a fixed stand (
16) A housing (10) on which a sheave (8) is pivotally supported
) is attached rotatably around the vertical axis (P4).

The experiment was conducted using the above-mentioned experimental model (M), with two cases in which the housing (10) was allowed to rotate, and one in which the housing (10) was allowed to rotate.
) was fixed.

In each experiment, the load (1,
) up to the length of Tsuiya (W) [1m], luggage (L)
The weight was set to [400g].

The experimental results are shown in Table 1 below. From this result, it can be seen that in the hanging device according to the present invention, the attenuation of the swinging of the wire (W) is extremely accelerated.

Table-1 [Another example] Next, another embodiment of the present invention will be described.

<r> As shown in FIG. 6, the present invention is applicable to a horizontal boom type jib crane.

This jib crane has a horizontal boom (2) and a swivel platform (3).
It is fixed to the tower (1) and integrated with the swivel base (3).
) can rotate 360 degrees around the pivot (P, ). The trolley (21) to which the sheave (8) for guiding the hanging wire is attached moves from side to side in the figure along the horizontal boom (2), thereby moving the hanging hook (7) to the tower center. The configuration is such that the distance M (L) from the distance M (L) can be changed.

In this configuration, the horizontal boom (2) does not rise or fall, so as shown in FIG.
1) may be directly fixed to the trolley (21). Since the other configurations are the same as those of the previous embodiment, the same numbers will only be given and the explanation will be omitted.

<2> As shown in Figure 8, the outer wall surface (Bc
) The present invention is applied to a wall surface work device for cleaning and repairing walls.

This wall surface work device is connected to a roof car (22) installed on the roof of a building (B) and a hanging wire (W) from the tip of a lifting arm (23) extending from the roof car (22). It consists of a gondola (24) for crew members, which is suspended and supported.

The wire (W) is connected to the winch (2) inside the roof car (22).
A sheave (8) that is wound around the take-out arm (23
) is attached to the tip of the

As shown in FIG. 9, this sheave (8) is attached to a mounting shaft (25) that is constructed across a pair of frames (23A) that constitute the lifting arm (23).
The sheave (8) is movably fitted along the axial direction of the sheave (8) and the inner surfaces of the frame bodies (23A) on both sides.
A spring (26) is interposed in each case to elastically hold the sheave (8) in position.

That is, in this embodiment, the above-mentioned mounting structure of the sheave (8) is attached to the suspension fulcrum (W) of the wire (W) shown in FIG.
Support means (SM) for movably supporting p) in the horizontal direction
It becomes.

In this configuration, the gondola (2
4) When the wire (W) sways together with the wire (W), the hanging fulcrum (p) of the wire (W) moves in the horizontal direction, so that the attenuation of the sway can be made faster, and
The urging force of the spring (26) restricts unexpected movement of the sheave (8).

(3) In addition to the hoisting boom type jib crane of the previous embodiment and the horizontal boom type jib crane of the above-mentioned configuration 1), the roof car (22) and fixed It can be applied to various types of cranes, either type or mobile, and these are collectively referred to as suspension devices.

Moreover, the boom (2) of a crane and the take-out arm (23) of a wall work device are collectively referred to as an arm (A).

4) The structure of <2> described above may be applied as the support means (SM) in the jib crane described in the previous embodiment, or the spring (26) may be omitted from the structure, or the wall surface Work equipment roof car (22
As the support means (SM) in ), the configuration of N> described above may be applied.

5> The configuration of the support means (SM) shown in the embodiments <1> or 2> above is partially changed, and as shown in FIG. ) is arranged in such a manner that its upper side is inclined toward the hanging fulcrum (p) with respect to the vertical direction.

In this configuration, the sheave (
Since the sheave (8) returns to the central position and is biased, unexpected swinging of the sheave (8) during loading and unloading is reduced.

6> The above-mentioned support means (SM) is interposed between the distal end and the proximal end of the arm (A).

In addition, in the claims section, for convenience of comparison with the drawings □
However, the present invention is not limited to the structure shown in the accompanying drawings by the reference numerals.

[Brief explanation of the drawing]

1 and 1 show an embodiment of the hanging device according to the present invention, FIG. 1 is a front view of the support means, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. An overall side view of the jib crane, Figures 4 (a) and (0) are schematic front views showing the principle,
FIG. 5 is a front view of the experimental model. 6 to 10 show another embodiment of the present invention, FIG. 6 is an overall side view of a jib crane showing another embodiment, and FIG. 7 is a support means in another embodiment shown in FIG. 6. FIG. 8 is an overall side view of a wall working device showing still another embodiment, FIG. 9 is a front view of
The figure is a sectional view taken along the line IX-IX in FIG. 8, and FIG. 10 is a sectional view corresponding to FIG. 2 showing still another embodiment. (A)...Arm, (W)...Wire, (p)...Suspension fulcrum, (SM)...
...Supporting means, (P+) ... Vertical axis, (P4
)... Vertical axis center, (8)... Sheave, (
26) Spring.

Claims (1)

[Claims] 1. In a hanging device in which an arm (A) hangs and supports a hanging wire (W), the arm (A) includes:
A suspension device provided with a support means (SM) that supports the suspension fulcrum (p) of the wire (W) so as to be movable in the horizontal direction. 2. The hanging device according to claim 1, wherein the arm (A) is rotatable around a vertical axis (P_1). 3. The suspension according to claim 1 or 2, wherein the suspension fulcrum (p) is constituted by a sheave (8) that guides the feeding and feeding of the wire (W). Device. 4. Any one of claims 1 to 3, wherein the support means (SM) supports the hanging fulcrum (p) so as to be able to swing around the vertical axis (P_4). The suspension device described in . 5. The suspension according to claim 4, wherein the vertical axis (P_4) is arranged in such a manner that its upper side is inclined toward the suspension fulcrum (p) with respect to the vertical direction. Lower device. 6. According to any one of claims 1 to 5, wherein the support means (SM) has a spring (26) that elastically holds the hanging fulcrum (p) in position. Suspension device as described.