JPH07267580A - Method and device for preventing swinging / rotation of suspended load - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method and apparatus for reducing or preventing swinging or rotation of a suspended load such as a lifting machine by utilizing a reaction force of a controlled jet air flow. [Structure] A plurality of injection nozzles 24 (or blowers) for ejecting a pressurized gas to generate a propulsion force are mounted on a falling block 10 such as a lifting machine, and the suspended load 3 is shaken by the jet air flows of the jet nozzles 24. Alternatively, a force against rotation is generated to prevent at least one of swinging motion and rotating motion of the suspended load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for preventing the rotation or shake of a suspended load which is an object to be conveyed by a hoist such as a ceiling hoist.

[0002]

2. Description of the Related Art Conventionally, a ceiling hoist generally used conventionally hangs and conveys an object to be conveyed by a falling block suspended by a wire rope suspended from a winding drum. The method of doing is adopted. When suspending and transporting an object to be conveyed in this way, the wire rope itself does not have resistance to twisting and wobbling, so the object to be conveyed (hereinafter referred to as the suspended load) is often accelerated during horizontal movement. Due to inertial force, wind pressure, and the like during deceleration, a rotating motion may occur around the suspension core, or a pendulum motion may occur around the upper end of the wire rope as a fulcrum.

For this reason, the suspended load cannot touch the surrounding structure or collide with it to prevent normal transportation, or it cannot be hung while being hung in the same direction as when it was being hung. In addition, various inconvenient problems may occur, such as making it difficult to reliably position and hang it at a predetermined location.

Because of the above-mentioned problems when a suspended load is conveyed by a general ceiling hoist, a sling person usually positions the suspended load manually or controls the rotational movement of the sling load. However, such a work is not only dangerous, but also causes another problem that labor costs are increased. As a ceiling hoist designed to solve various problems in such a conventional general ceiling hoist, it is possible to suspend a load at the lower end of a guide rod that is restricted from rotating in a horizontal plane and slides in the vertical direction. Of a structure that suspends a load, or a structure that suspends a suspended load through a suspension beam whose both ends are suspended at the lower end of each of two sets of winding drums, wire ropes, and falling blocks that are arranged apart from each other. Things are known.

However, all of these are ceiling hoists with a special structure having a complicated structure, are extremely expensive, and the investment effect is difficult to obtain. Further, in some cases, it is not restricted in space and is not easy to use, so that it has often been impossible to adopt it as a general-purpose one. Therefore, the present invention has been made by paying attention to such conventional problems, and a set of winding drums, wire ropes, and
In a lifting machine that consists of basic lifting mechanism elements such as a falling block, a hoist that reduces or prevents swinging or rotation of the suspended load by using the reaction force of the controlled jet air flow, thus enabling smooth transportation. It is an object of the present invention to provide a method for preventing swinging / rotation of a load and a device therefor.

[0006]

A method for preventing swinging / rotation of a suspended load according to the present invention which achieves the above-mentioned object is to generate a force against a swing or rotation of a suspended load such as a lifting machine by a jet air flow,
The propulsive force prevents the suspended load from swinging or rotating. In addition, the swing load swing / rotation preventing device of the present invention is
A device that prevents at least one of swinging motion and rotating motion of a suspended load transported by a lifting machine, etc., and is mounted in an array on the circumference of the same core as the hanging core of the falling block.
A plurality of injection nozzles for ejecting a pressurized gas to generate a propulsive force are provided.

Here, the jet nozzle may be arranged so as to jet a pressurized gas in a radial direction from a hanging core to generate a propulsive force. Further, the injection nozzle,
It can also be arranged so as to generate a propulsive force by ejecting in the direction of the tangent line of the circumference of the hanging core and the same core. Further, the apparatus for preventing vibration and rotation of a suspended load according to the present invention includes a pair of jetting a pressurized gas to derive a propulsive force in order to prevent at least one of the vibration and the rotational motion of the suspended load conveyed by a lifting machine or the like. The blower described above may be mounted on the falling block.

[0008]

When the falling block receives an external force and swings, the pressure gas is jetted from the jet nozzle or the blower in the same direction as the swing according to the direction of the swing. The swinging motion is damped by the reaction force of the injection. When the falling block receives an external force and rotates about the suspension core as an axis, it generates a couple that cancels the rotating motion.
The pressurized gas is jetted tangentially from the jet nozzle or blower. The rotational force is braked by the reaction force of the injection.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. FIG. 1 is a front view of a falling block portion of a ceiling hoist, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. One
It is a III-III line sectional view.

In the figure, 10 is a falling block body, which is suspended by a wire rope 2 suspended from a winding drum of a ceiling hoist body not shown. The falling block body 10 is of a generally used type, and includes a sheave 11 on which the wire rope 2 is hung, a shaft 12 for rotatably supporting the sheave 11,
A C hook 13 for directly suspending a suspended load 3 such as a coil, which is an object to be transported, these shaft 12 and C hook 1
It is composed of parts such as a connecting plate 14 for connecting and fixing the plate 3 and the like.

A shaking / rotation preventing device 20 for preventing or reducing the swinging or rotating of the suspended load 3 is attached to the falling block body 10. The runout / rotation preventing device 20 is attached to the annular header pipe 21 surrounding the connection plate 14, four branch pipes 22 arranged in the header pipe 21, and the branch pipes 22. Control valve 23, injection nozzle 24 provided on the outlet side of each control valve 23, pressurized gas supply hose 25 for feeding pressurized gas to header pipe 21, power supply line 26 for supplying power to the electromagnetic circuit of control valve 23, falling The block main body 10 is composed of main components such as a mounting plate 27. Then, the pressurized gas supply hose 25 is supplied with a pressurized gas such as compressed air pressurized to about 7 atm from a compressor (not shown) mounted on the ceiling hoist body, and the pressurized gas is supplied to the header. Pipe 2
1, the branch pipe 22, the control valve 23, the injection nozzle 24, etc., and is injected into the atmosphere.

The header pipe 21 has a mounting plate 27.
By the connecting plate 1 of the falling block body 10
It is fixed to No. 4 and has a function of distributing the pressurized gas collectively supplied from the pressurized gas supply hose 25 to each of the four branch pipes 22 and other main parts of the shake / rotation preventing device 20. It also plays the role of a skeleton that supports and organizes the components.

The control valve 23 is a valve for controlling the amount of the pressurized gas ejected from the injection nozzle 24, and a predetermined electric input signal applied from a control device (not shown) via the power supply line 26. It is driven to open and close individually. The driver of the ceiling hoist may visually check the movement of the suspended load 3 and output the input signal by manually operating the operation switch at hand according to the movement. Alternatively, a detector for detecting the movement of the suspended load 3 is used, and a control signal for automatically suppressing the movement of the suspended load 3 such as swinging and rotation is provided based on the output signal of the detector. Is also good.

As the detector for detecting the movement of the suspended load 3, various general ones such as an industrial television camera, an acceleration detector, and a tilt detector can be applied depending on the case. The injection nozzles 24 are for obtaining a reaction force generated by injecting a pressurized gas into the atmosphere, that is, a propulsion force. Four of them are provided on the radiation centering on the suspension axis of the falling block body 10. Is arranged outward. For example, now injection nozzle 2
When the injection port diameter of 4 is 3 cm, one injection nozzle 24 generates a propulsive force of about 49 kg by ejecting a pressurized gas of 7 atm, and this propulsive force is applied to the falling block body 1
It has the function of controlling the movement of the suspended load 3 which is transmitted to the C hook 13 and is consequently suspended on the C hook 13.

The operation of the shake / rotation preventing device 20 configured as described above will be described below. Now, for example, the ceiling hoist that is transporting the suspended load 3 suddenly decelerates, and the inertial force thereof suspends the suspended load 3 and the falling block body 10 that suspends the suspended load 3.
Suppose that he has started to swing horizontally. In that case, the driver manually operates the operation switch when the falling block body 10 that suspends the suspended load 3 swings and moves toward the right direction indicated by the arrow A in FIGS. 1 and 3, for example. And the injection nozzle 24 attached to the right side
The control valve 23 is opened by applying an electrical input signal (when the detector detects the movement of the suspended load 3, the output signal of the detector is automatically input to the control valve 23 to open the valve. To).
As a result, the pressurized gas supplied into the header pipe 21 is jetted from the jet nozzle 24, and a leftward propulsive force is generated in the jet nozzle 24 so as to resist the swinging movement in the arrow A direction. This propulsive force is transmitted to the falling block body 10 via the header pipe 21, and the swinging motion in the arrow A direction is stopped.

On the contrary, when the suspended load 3 is moving to the left as indicated by the arrow B, the pressurized gas is ejected to the left from the injection nozzle 24 attached to the left side, and the generated rightward is generated. The swinging motion is braked by the driving force of. Similarly, in FIG.
With respect to the shake in the front-rear direction indicated by arrows C and D, pressurized gas is jetted from the injection nozzle 24 on the side in the direction in which the falling block body 10 is swinging and moving, and the movement thereof is stopped.

Thus, the falling block body 1
Select the injection nozzle 24 according to the shake movement direction of 0,
By causing the pressurized gas to be ejected from the selected ejection nozzle 24 to generate a propulsive force in a direction against the oscillating movement, the sway of the suspended load 3 can be prevented. In addition, in the said 1st Example, although the thing which provided four injection nozzles 24 was shown, it is also possible to arrange | position four or more injection nozzles 24, and by this, the front-back and left-right intermediate direction is carried out. Runout can be prevented. However, in that case, it is preferable that the control of each control valve is automatically performed by the output signal of the motion detector of the suspended load, rather than manually performed by the driver.

FIG. 4 shows another embodiment. This is a suspended load 3
This is an example which can be suitably used not only for the swinging movement of the header pipe but also for preventing the rotation, and FIG. 4 shows the nozzle arrangement of the header pipe 21 as in FIG. In this case, 8
The individual injection nozzles 24a to 24h are arranged in combination so as to generate a couple of forces centering on the hanging core C and also to generate forces in the front-rear, left-right directions in the horizontal plane. That is, four sets of injection nozzles (24a, 24b) and (24c, 24c,
24d), (24e, 24f) and (24g, 24h) are arranged, and the injection nozzles 24a and 24e, the injection nozzles 24b and 24f, the injection nozzles 24c and 24g, and the injection nozzles 24d and 24h are suspension cores, respectively. It is arranged so as to be point-symmetric with respect to C.

The other structure may be the same as that of the first embodiment. In this embodiment, when the suspended load 3 is going to make a rotational motion in the direction of arrow E in FIG. 4 under the influence of some external force or inertial force, the injection nozzles 24a, 24e positioned in point symmetry are used. , 24c and 24g are simultaneously jetted with pressurized gas. With the thrust of this simultaneous injection,
A couple force that causes rotation in the direction opposite to the arrow E acts on the falling block body 10 to cancel the rotation force in the direction of the arrow E. As a result, the falling block body 10
The rotational movement of the is prevented.

In the case where the falling block body 10 makes a rotational movement in the direction of the arrow, which is the opposite direction of the arrow E,
Similarly, the pressurized gas may be simultaneously jetted from the jet nozzles 24b, 24d, 24f, and 24h that are also point-symmetrical but have opposite jetting directions to prevent their rotation. Also,
When the swinging motion of the falling block body 10 in the left-right direction occurs, the two parallel injection nozzles 24a, 24f are simultaneously operated during the movement in the right direction indicated by arrow a. On the other hand, if it is moving to the left as indicated by the arrow B, the other two parallel injection nozzles 24b and 24e are simultaneously operated. Further, in the case where the swaying motion in the front-back direction occurs, the injection nozzles 24 at the two parallel locations during the movement in the direction of arrow C
Operate c and 24h at the same time. On the other hand, if it is moving in the direction of arrow D, the other two parallel injection nozzles 24d,
Operate 24g simultaneously. In this way, it is possible to prevent lateral shake in the front, rear, left and right.

Also in the case of the second embodiment, it is possible to dispose four or more pairs of the injection nozzles 24a to 24h. FIG. 5 shows still another embodiment. In contrast to each of the above-described embodiments, a pressurized gas such as compressed air supplied from a compressor or the like is pre-injected to obtain a propulsive force that prevents swinging / rotation of a suspended load. The same purpose is achieved by using a blower such as a flow fan.

FIG. 5 is a front view of a falling block 40 suitable for carrying a suspended load of a long object. That is, the wire rope 2 suspended from the winding drum of the ceiling hoist body (not shown) is hung on the sheave 11, and the connecting plate 14 supporting the rotating shaft 12 of the sheave is attached to both ends so as not to bend a long suspended load. A beam 41 suitable for hanging with a hook 42 is attached. At both ends of the beam 41, a pair of, for example, axial fans 43a and 43b for blowing out an airflow in a direction perpendicular to the longitudinal direction of the beam are mounted in the same posture. In addition, the axial fans 43a and 43b
Does not necessarily have to be a pair (two), and one or more pairs can be arranged as necessary.

The axial fans 43a and 43b are automatically operated by a detector for detecting an electric signal or a motion of a suspended load by a driver's manual operation, as in the case of driving the control valve 23 in each of the above embodiments. Driven by an electric signal that is sent in a controlled manner, and its rotation direction and rotation speed, that is, the air ejection direction and ejection force are controlled. For example, when the falling block 40 receives an external force together with a long suspended load (not shown) suspended by the hook 42 and tries to rotate in the horizontal plane about the axis of the suspension, The axial fans 43a and 43b are rotationally driven at the same speed in opposite directions to simultaneously inject air in opposite directions. By the propulsive force of the simultaneous injection, a couple force that causes the falling block 40 to rotate in the opposite direction is applied to cancel the rotating force in the horizontal plane, and the rotating motion of the falling block 40 and the suspended load is prevented.

On the other hand, when the falling block 40 receives an external force and tries to laterally swing in the direction perpendicular to the paper surface in FIG. 5, both axial fans 43a and 43b are rotationally driven in the same direction at the same speed to generate air. Are simultaneously jetted in the same direction, and the propulsive force cancels the lateral shake motion of the falling block 40 in the direction perpendicular to the paper surface to stop the shake. According to the first embodiment of the present invention, the compressed air of the compressor mounted on the lifting machine is ejected from the injection nozzle 24 through the control valve 23 of the shake / rotation preventive device 20, and the suspended load is applied by the propulsive force of the ejection. Since the swinging motion of the hanging block main body 10 by which the hanging is suspended is prevented by an external force, a stable and smooth movement can be achieved without the slinging person manually positioning the suspended load or suppressing the rotational movement. It is possible to carry out various kinds of transportation and accurately hang it down to a predetermined position with a simple structure and inexpensive equipment, and it can be easily applied to a general-purpose lifting machine, improving work efficiency, reducing labor costs, and safety. Ensuring great effects such as securing and improving product quality.

Further, according to the second embodiment of the present invention, by making the injection direction of the injection nozzle in the first embodiment the tangential direction of the circumference centered on the hanging core, the falling block body is formed. It becomes possible to prevent the rotational movement as well as the swaying movement of 10, and in addition to the effect similar to that of the first embodiment, the effect of preventing the rotation of the suspended load in the horizontal plane is also obtained, and the range of use is further expanded. It

Further, according to the third embodiment of the present invention, an axial blower is mounted on both ends of the long falling block 40, and the jetting direction and speed of the axial blower are adjusted according to the posture change of the suspended load. Since it is controlled, swing and rotation can be easily and reliably performed even for hanging a long object with a simpler facility, which also improves work efficiency, reduces labor costs, ensures safety, Great practical effects such as quality improvement can be obtained.

In the embodiment, the case where the present invention is applied to the ceiling hoist has been described as an example, but the present invention is not limited to this and can be applied to other hoisting machines as well. Also,
It can be widely used for applications other than hoisting machines to prevent swinging and rotation of suspended loads.

[0028]

As described above, according to the present invention, a plurality of injection nozzles are provided in a falling block in order to prevent at least one of swinging motion and rotary motion of a suspended load conveyed by a lifting machine or the like. Or, it is equipped with a blower, and the jetting air flow generates a propulsive force against swinging or rotation of the suspended load to prevent swinging or rotation of the suspended load, so it can be easily applied to general-purpose lifting machines. It is possible to effectively reduce or prevent the swinging or rotating of the suspended load with an inexpensive equipment that can bring about great practical effects such as improving the efficiency of transfer work, reducing labor costs, and ensuring safety.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view corresponding to FIG. 3 in a second embodiment of the present invention.

FIG. 5 is a front view of a main part of a third embodiment of the present invention.

[Explanation of symbols]

 2 Wire rope 3 Suspended load (transported object) 10 Falling block (main body) 20 Shake / rotation prevention device 21 Header pipe 23 Control valve 24 Injection nozzle 40 Falling block (main body) 43a Blower 43b Blower

Claims (5)

[Claims] 1. A swing / rotation of a suspended load such that a force against the swing or rotation of a suspended load such as a lifting machine is generated by the jet air flow and the swing force or rotation of the suspended load is prevented by the propulsive force. Prevention method. 2. A device for preventing at least one of a swinging motion and a rotating motion of a suspended load conveyed by a lifting machine or the like, which is arranged and mounted on the circumference of a concentric core with a suspending core of a falling block. An apparatus for preventing swinging / rotation of a suspended load, comprising: a plurality of injection nozzles for ejecting a pressurized gas to generate a propulsive force. 3. The hanging load shake prevention device according to claim 2, wherein the injection nozzle is arranged so as to eject the pressurized gas in a radial direction from the hanging core. 4. The swing of the suspended load according to claim 2, wherein the injection nozzle is arranged so as to eject the pressurized gas in a direction of a tangent line of a circumference concentric with the suspension core. Prevention device. 5. A device for preventing at least one of swinging or rotating motion of a suspended load conveyed by a lifting machine, which is mounted on a pair of falling blocks in pairs and ejects pressurized gas to propel it. An apparatus for preventing swinging and rotation of a suspended load, comprising a plurality of blowers for generating air.