JPH08301582A - Elevating device - Google Patents

Abstract

PURPOSE: To provide an elevating device eliminating the fear of fall of a suspended body supported by an elevating part elevated by wire ropes, so as to be usable in safe. CONSTITUTION: An elevating device is provided with an elevating part 28 to which a luminaire (a suspended body) 22 is fitted, a plurarity of wire ropes 26, 27 with one end parts fixed to the elevating part 28, and winding drums 35, 36 provided coaxially in parallel and having rope winding grooves 35a, 36a into which the wire ropes 26, 27 are wound. The elevating device is further provided with a winding drum body 31 of such constitution that the other end parts of the respective wire ropes 26, 27 are individually fixed to the winding drums 35, 36 and that the wire ropes 26, 27 are individually lap-wound in the respective rope winding grooves 35a, 36a, spirally in a row, and drum driving parts 29, 30 for rotating the winding drum body 31 normally and reversely so as to wind and rewind the wire ropes 26, 27. Accordingly, in the case of one wire rope being cut, the fall of the elevating part 28 and luminaire 22 is prevented by the other wire rope.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applicable to factories, gymnasiums, arenas, large-scale stores, warehouses, halls, entrances, lighting fixtures, etc., which are arranged in high places on the ceiling side such as stairs of large buildings such as hotels and department stores. The present invention relates to a lifting device capable of lifting a suspended object with a wire rope.

[0002]

2. Description of the Related Art Providing a lighting fixture placed on a high ceiling of a gymnasium or the like so that it can be lifted and lowered by an electric lifting device, etc.
It is excellent in that it facilitates maintenance of lighting equipment.
In this type of lifting device, the wire rope is turned upside down in the lifting unit in order to allow the lighting fixture supported by the lifting unit to lift and lower while maintaining a stable posture without rotating freely during its lifting, The structure is substantially the same as when the lighting fixture is suspended by two wire ropes.

This type of lifting device has a double-drum type using a winding drum in which two rope winding groove portions are arranged side by side, and a winding drum having a single rope winding groove portion, due to its wire rope winding structure. It is roughly divided into the single drum type that uses.

FIG. 6 shows a schematic structure of a single-drum type electric lifting device. In the figure, reference numeral 1 denotes an apparatus frame installed on a high ceiling 2, in which a forward / reverse rotatable motor 3 with a speed reducer is incorporated as a drum driving section.
A brake 5 is provided on the motor 3. The winding drum 4 is connected to the output shaft of the motor 3. The drum 4 has a single rope winding groove 4a.

One end of the wire rope shown by reference numeral 6 is fixed to a winding drum facing the rope winding groove 4a of the winding drum 4, and the other end is a sheet metal in a position outside the winding drum 4 in the apparatus frame 1. It is fixed to a fixed portion 7 such as a component. An intermediate portion of the wire rope 6 can be hung down to the outside of the device frame 1 through the lower surface opening 1a of the device frame 1, and an elevating portion 8 is suspended in the intermediate portion.

The elevating part 8 has a plurality of rollers 8a therein, and the wire rope 6 is passed through these rollers 8a, whereby the wire rope 6 is vertically inverted by the elevating part 8. . A lighting device (suspended object) 9 arranged on the lower side of the elevating part 8 is attached. In addition,
In FIG. 6 (B), 10 is a floor.

FIG. 7 shows a schematic structure of a double-drum type electric lifting device. The difference between this lifting device and the single-drum type electric lifting device will be described (note that the same components as those of the other single-drum type electric lifting device are denoted by the same reference numerals and the description thereof will be omitted). Then, the winding drum 14 connected to the output shaft of the motor 3
Is the first rope winding groove 14a and the second rope winding groove 1
4b and these winding groove portions 14a, 14b
Are arranged side by side on the same axis. One end of the wire rope 6 is fixed to the winding cylinder facing the first rope winding groove 14a, and the other end is fixed to the winding cylinder facing the second rope winding groove 14b. The configuration other than these points is the same as that of the single-drum type electric lifting device.

In any of the above-mentioned lifting devices,
The motor 3 is rotated in the normal direction against the braking release state or the braking force of the brake 5, and the wire rope 6 is rewound from the winding drum 4 or 14, so that the rope 6 is unwound and the lifting unit 8 and the lighting fixture are also provided. 9 can be lowered. On the contrary, in the state where the lighting fixture 9 is on the floor 10, the motor 3 is reversely operated to rotate the winding drum 4 or 1.
By wrapping the wire rope 6 around 4, the lighting fixture 9 can be raised together with the elevating part 8.

[0009]

By the way, in any of the above-described lifting devices, the lighting fixture 9 is substantially divided into two.
Since the wire rope 6 is folded back in the elevating part 8 and the lighting equipment 9 is suspended by one wire rope 6 so as to be fully suspended, in the unlikely event that the wire rope 6 is cut during the ascending / descending operation, As shown in FIG. 6 (B) or FIG. 7 (B), the lifting / lowering portion 8 is disengaged from the wire rope 6 and the lighting fixture 9
Falls.

Therefore, the inventor of the present invention, in the double drum type structure, individually attaches one end of each of the two wire ropes to the winding drum facing the first and second rope winding grooves 14a and 14b of the winding drum 4. By fixing the other end of each of the wire ropes to the elevating part 8 individually, the elevating parts 8 are individually separated so that the lighting device 9 does not drop regardless of the cutting of one wire rope. I devised a measure to suspend the book.

The winding drum facing the rope winding grooves 14a and 14b of the conventional winding drum 4 has a cylindrical shape. Therefore, the wire rope is wound in a cylindrical shape along the winding cylinder, and the cylindrical rope layers are wound so as to be stacked in multiple layers.

However, when the wire rope is wound on the lowermost cylindrical rope layer one after another, the winding method is not fixed because it can move freely within the width of the winding cylinder. It is difficult to manage the same winding amount for the first and second rope winding grooves 14a and 14b. As a result, when two wire ropes are wound to raise the elevating part, the first and second rope winding grooves 14a, 14b
As a result, there is a difference in the winding amount with respect to, and the lifting / lowering body 8 cannot be kept horizontal and is inclined and easily lifted. As a result, it is likely that the lifting unit cannot be locked at the predetermined raised position.

Incidentally, this type of lifting device is provided with a lifting part locking mechanism. This mechanism has a locking claw or the like that is engaged with a claw receiving part (not shown) of the elevating part 8 when the upper part of the elevating part 8 is raised to a predetermined elevated position where it reaches the inside of the device frame 1. Is a mechanism for mechanically supporting the elevating part 8. Thereby, it is used to prevent the weight of the luminaire 9 from being applied to the wire rope 6.

Therefore, when a lock failure occurs in the lifting / lowering part locking mechanism due to the lifting / lowering part 8 which is tilted and lifted as described above, the weight of the luminaire arranged at the ceiling-side high place is always the wire. Since it acts on the rope, it is rather likely that the wire rope will be easily cut and the risk of the lighting fixture 9 falling will increase.

An object of the present invention is to provide a lifting device that can be used safely without the risk of a suspended object supported by a lifting part that is lifted and lowered by a wire rope.

[0016]

In order to achieve the above object, the lifting device according to the present invention comprises a lifting part to which a suspended object is attached, and a plurality of wire ropes whose one end is fixed to the lifting part. , A plurality of winding drums coaxially arranged with a rope winding groove around which the wire ropes are wound, the other end of each of the wire ropes being individually fixed to these winding drums. A winding drum body in which each wire rope is individually wound around each rope winding groove in a spiral shape and in a row, and the winding drum body is normally / reversely rotated to wind / unwind the wire rope. And a drum drive section.

[0017]

In the construction of the lifting device of the present invention, each wire rope suspends the lifting part individually. Then, since each wire rope is individually wound in a spiral shape in the rope winding groove of each winding drum in an orderly manner, it is possible to eliminate an imbalance in the winding amount or the rewinding amount of each wire rope with respect to each winding drum. it can. Also, the drum drive is
The winding drum body is normally or reversely rotated, and the wire ropes individually fixed to the respective winding drums are wound or unwound.

As described above, in the lifting device of the present invention, the wire ropes are simultaneously wound or unwound on the respective winding drums so that the winding amount and the unwinding amount of the respective wire ropes are not unbalanced. The part can be raised and lowered without its inclination. Then, even if, for example, one wire rope is cut during such ascending / descending, the elevating part can be held in a suspended state by another sound wire rope.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In FIGS. 1 and 2, reference numeral 21 denotes a high ceiling such as a gymnasium, and a large number of electric lifting devices 23 (only one unit is shown) for lifting and lowering suspended objects such as lighting fixtures 22 are installed on the high ceiling 21. . These lifting devices 23 are lifted and lowered via an operation panel (not shown) installed on the floor side, and the operation panel has a plurality of circuit systems for simultaneously lifting and lowering several lifting devices 23.

As shown in FIG. 1, the lifting device 23 includes a device frame 24, an electric winding device 25, two wire ropes 26 and 27, a lifting part 28, a guide roller (not shown), and slack detection. The device includes a means, a reverse winding detector, a control unit, and a lifting / lowering unit locking mechanism.

Device frame 24 fixed to high ceiling 21
Has a box shape, and an opening 24a is provided in its lower wall. The electric winding device 25 is built in the device frame 24. In this electric winding device 25, a gear reducer 30 is connected to a motor 29 capable of normal and reverse rotation, a winding drum body 31 is connected to an output shaft 30 a of the reducer 30, and a brake 32 is connected to the motor 29. Is provided. The motor 29 and the gear reducer 30 form a drum drive unit 33. Reference numeral 37 in FIG. 1 is a bracket for fixing the electric winding device 25 to the device frame 24.

The brake 32 is, for example, of a mechanical type, and a brake shoe and a coil spring for urging the brake shoe in a pushing direction are provided on a plurality of cylindrical portions which are not shown in the drawing, and which are provided on the inner surface of the end wall of the motor case. And the motor 2
It is formed by attaching a brake disc to which a brake shoe is constantly pressed on a rotating shaft of 9.

The brake 32 constantly prevents the rotation of the rotary shaft of the motor 29 by the friction braking force between the brake disc and the brake shoe, and fixes the rotary shaft when the motor 29 is not operating. Motor 2 for raising and lowering
In the case where 9 fails, the lighting fixture 22 rewinds the wire ropes 26 and 27 due to its weight so as not to drop carelessly. The rotation torque of the motor 29 is larger than the friction braking force, so that when the motor 29 operates, its rotation shaft is rotated against the friction braking force.

The brake 3 attached to the motor 29
2 is not limited to a mechanical type, and may have a solenoid and employ a non-excitation actuated electromagnetic brake or the like that has a braking state when not energized and releases this braking state when energized.

As shown in FIGS. 1 and 3, the winding drum body 30 is fitted on the output shaft 30a and fixed at both ends of a cylindrical central shaft 34 which is fixed so as not to move around this shaft. First and second winding drums 35 and 36 are provided, respectively. Therefore, both winding drums 35 and 36 are coaxially arranged side by side. As shown in FIG. 2, both winding drums 35,
The groove width A of the rope winding grooves 35a, 36a included in 36 is
It is set to 1.0 times to less than 2.0 times, and particularly preferably 1.0 times to 1.5 times, the diameter B of the wire ropes 26 and 27.

Both winding drums 35 and 36 are wire ropes 2.
6 and 27 have a diameter capable of winding most of the entire length, and are formed on the inner surfaces of the flanges of the winding drum 35 facing each other and on the inner surfaces of the flanges of the winding drum 36 facing each other. Are chamfered in a diagonal manner. By these chamfers, the wire ropes 26, 27
Is prevented from being caught on the peripheral end surfaces of the flanges of the corresponding winding drums 35 and 36, and the wire ropes 26 and 27 are smoothly wound around the winding drums 35 and 36.

The two wire ropes 26 and 27 are of the same wire type and the same wire diameter. These ropes 26 and 27 have a length that can give the lighting fixture 22 a lifting height of 15 m.

One wire rope 26 has one end fixed to the elevating part 28 and the other end fixed to the first winding drum 35. The rope winding groove 35a of the drum 35 is provided. It has a mainspring shape and is wound in a line (see Fig. 1). Similarly, the other wire rope 27 has one end fixed to the elevating part 28 and the other end fixed to the second winding drum 36. The rope winding groove 36a of the drum 36 is provided.
It has a mainspring shape and is wound in a line (see Fig. 1). The position where one ends of the wire ropes 26 and 27 are fixed to the elevating part 28 is a position where the weight of the elevating part 28 is well balanced. The wire ropes 26 and 27 thus provided are simultaneously wound around the winding drums 35 and 36 by the same amount as the motor 29 rotates forward or backward.
Or it is rewound.

Both wire ropes 26 and 27 are provided in the apparatus frame 24 so as to be routed through the guide rollers (not shown) and hang down through the opening 24a.

As described above, the two wire ropes 26, 2
The lighting fixture 22 is attached to the elevating part 28 individually hung by 7. Inside the device frame 24 and in the elevating part 28, contact mechanisms that are brought into contact with and separated from each other as the elevating part 28 moves up and down are provided. These contact mechanisms are lifted and lowered by the lift lock mechanism (not shown).
8 is closed when it is mechanically supported, so that the lighting device 22 can be energized from the device frame 24 side through the elevating part 28.

An elevator lock mechanism (not shown) provided in the device frame 24 raises and lowers the elevator 28 when the upper part of the elevator 28 reaches the inside of the device frame 24.
Has locking claws and the like that are engaged with the claw receiving part (not shown),
The lifting portion 28 is mechanically supported by these engagements. As a result, the weight of the luminaire 22 is reduced by the weight of the wire ropes 26, 2.
I try not to join 7.

The slack detecting means (not shown) is used to detect the slack in one of the wire ropes 26 and 27 and stop the operation of the motor 29 based on the detection. Further, the reverse winding detector (not shown), when all of the wire rope wound around one of the winding drums 35 and 36 is unwound, by continuing the rotation of the winding drum, It is provided to prevent the wire rope from being wound in the direction opposite to the correct winding direction of the wire rope, and the operation of the motor 29 is stopped based on the detection of the reverse winding.

The control unit (not shown) is built in the device frame 24, and is based on the control command from the control panel (not shown) input to the device frame 24 and the detection output of the slack detecting means and the reverse winding detector. The operation of the motor 29 (start / stop, forward rotation / reverse rotation) is controlled.

The electric lift device 23 having the above-described structure is configured such that the motor 29 of the electric take-up device 25 is normally or reversely rotated to wind or rewind the wire ropes 26 and 27 around the take-up drums 35 and 36. , The wire ropes 26, 2
It is possible to raise and lower the elevating part 28 that is hung on 7 and supports the lighting fixture 22.

When the descending power source is applied to the motor 29 of the electric winding device 25 to rewind the wire ropes 26 and 27 from the winding drums 35 and 36 of the winding drum body 31 at the same time, the lighting equipment is used. When the wire rope 22 reaches the floor, the wire rope slackness is detected by the slackness detecting means, so that the rewinding of the wire ropes 26 and 27 by the electric winding device 25 can be stopped via the control unit. As a result, maintenance or the like can be performed on the lighting fixture 22 that has reached the floor. Further, after this maintenance, the motor 29 of the electric winding device 25 is powered on to the rising side so that the wire ropes 26 and 27 are simultaneously wound on the winding drum body 3.
By being wound around the first winding drum 35, 36, the elevating part 28 can be engaged with the elevating part locking mechanism of the device frame 24 and mechanically supported.

By the way, since the elevating part 28 is individually suspended by two independent wire ropes 26 and 27, it is shown in FIG. 2B in the normal elevating state shown in FIG. 2A. Even if, for example, one wire rope 26 is cut, another healthy wire rope 27
Thus, the elevating part 28 can be held in a suspended state.
In this way, even if one wire rope is cut, there is no danger that the elevating part 28 will fall immediately due to it, so the safety when cutting the rope is high.

Moreover, in the lifting device 23, the lifting unit 2
2 wire ropes 26 and 27 that individually hang 8
The winding drums 35 and 3 in which these are individually wound and unwound.
The rope winding grooves 35a and 36a of No. 6 are not wound in a cylindrical shape but are wound in a spiral shape and in a line. Moreover, in such overlapping winding, the rope winding groove 3
Since the groove width A of 5a and 36a is set to 1.0 to 1.5 times the diameter B of the wire ropes 26 and 27 in the present embodiment, the wire ropes 27 and 28 to be overlapped are thicker than the winding drums 35 and 36. It is possible to more reliably prevent the upper layer rope portion from biting in the direction and biting between the lower layer rope portion and the flanges of the winding drums 35 and 36.

As described above, since both wire ropes 26, 27 are wound in orderly and spirally and in a row, the wire ropes 26, 27 having the same wire diameter and the same wire type are wound around the winding drums 35, 36. It is possible to eliminate imbalance in the amount of take-up or the amount of rewind.

Therefore, the wire ropes 26 and 27 provided respectively corresponding to the take-up drums 35 and 36 of the take-up drum body 31 do not cause imbalance in the take-up amount and the rewinding amount. At the same time, it is wound or rewound. Therefore, the elevating part 28 can be moved up and down without being inclined, and therefore the elevating part 28 can be reliably engaged with and supported by the elevating part locking mechanism at the predetermined rising position.

In this way, since the raising / lowering portion 28 can be mechanically supported, the weight of the lighting fixture 22 arranged at a high place on the ceiling side is always the weight of the wire rope 2 as in the case where a lock failure occurs.
Since it does not act on 6 and 27, it is possible to eliminate the risk that the wire ropes 26 and 27 are cut and the lighting fixture 22 is accidentally dropped from a high place on the ceiling side.

4 and 5 show the essential parts of the second embodiment of the present invention. The second embodiment is different from the first embodiment only in the structure of the winding drum and the number of wire ropes used, and the other structures are shown in FIGS. Since it has the same configuration as the electric lifting device of the first embodiment shown in FIG. 3, the configuration not shown is substituted by FIGS. 1 to 3, and the same components shown are the same as those of the first embodiment. Although the same reference numerals are given and the description of their configuration and the description of the action and effect based thereon are omitted, these same portions also form a part of the configuration of the electric lifting device according to the second embodiment. It is a thing.

The winding drum body 131 of the second embodiment is
As shown in FIGS. 4 and 5, the first to third winding drums 132 to 134 are coaxially arranged side by side, and the rope winding grooves 132a to 134a of the drums 132 to 134 are provided.
Of the groove width A of the wire rope 1 and the winding drums 132 to 134, which are individually wound in a spiral shape and wound in a row.
The relationship between 35 and 137 and the diameter B is the same as in the first embodiment. Further, one ends of these wire ropes 135 to 137 are individually fixed to the elevating part 28, and the other ends are individually fixed to the winding drums 132 to 134.
The configuration other than the above points is the same as that of the first embodiment.

In the second embodiment, the same effect as that of the first embodiment can be obtained and the intended object of the present invention can be achieved, and in achieving this, the number of wire ropes used is three. Since the probability that the wire will be cut at about the same time becomes extremely small, the safety in the case where a part of the wire rope is cut can be further improved.

The present invention is not limited to the above embodiments. For example, the number of wire ropes used may be increased to three or more. Further, the drum driving unit may be installed at a low place on the ground side instead of a high place on the ceiling side. In this case, a ceiling side frame with an elevator lock mechanism installed at a high place on the ceiling side is provided and a rope is attached to this frame. It may be carried out by attaching a reversing guide roller and passing this roller through the intermediate portion of the wire rope. Further, the drum drive unit is not limited to one that uses the power of the motor, and may be one that manually rotates the winding drum body. Further, the suspended object that is lifted and lowered by the lifting device of the present invention is not limited to electric equipment such as lighting equipment.

[0045]

As described in detail above, according to the lifting / lowering device of the present invention, each wire rope so as not to cause imbalance in the winding amount and the rewinding amount of each wire rope individually corresponding to each winding drum. The rope can be wound or unwound at the same time, and the elevating part can be moved up and down while preventing its inclination. Even if one wire rope is cut during such elevating, another healthy wire rope can be used. By holding the elevating part in a suspended state, the suspended object supported by the elevating part is prevented from falling and can be used safely.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of an electric lifting device according to a first embodiment of the present invention.

FIG. 2A is a diagram showing the electric lifting device according to the first embodiment in a state where the wire rope is not cut. FIG. 3B is a diagram showing the electric lifting device according to the first embodiment with its wire rope cut.

FIG. 3 is a front view showing a configuration of a winding drum body included in the electric lifting device according to the first embodiment.

FIG. 4 is a front view showing the configuration of a winding drum body included in the electric lifting device according to the second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of an electric lifting device according to a second embodiment.

FIG. 6A is a diagram showing a configuration of an electric lifting device according to a first conventional example. (B) is a figure which shows the electric raising / lowering apparatus which concerns on a 1st prior art example in the state in which the wire rope was cut.

FIG. 7A is a diagram showing a configuration of an electric lifting device according to a second conventional example. (B) is a figure which shows the electric raising / lowering apparatus which concerns on a 2nd prior art example in the state in which the wire rope was cut.

[Explanation of symbols]

 23 ... Lighting equipment (suspended object), 24 ... Elevating device, 25 ... Electric winding device, 26, 27, 135-137 ... Wire rope, 28 ... Elevating part, 31, 131 ... Winding drum body, 33 ... (Drum Drive unit), 35, 36, 132 to 134 ... Winding drum, 35a, 36a, 132a to 134a ... Rope winding groove.

Claims (1)

[Claims] 1. An elevating part to which a suspended object is attached, a plurality of wire ropes whose one end is fixed to the elevating part, and rope winding grooves around which the wire ropes are wound, and are coaxially arranged side by side. A plurality of winding drums, and the other ends of the wire ropes are individually fixed to the winding drums, and the respective wire ropes are individually wound around the rope winding grooves in a spiral shape and overlapped in a row. An elevating device comprising: a winding drum body to be wound; and a drum driving unit for winding the wire rope forward / backward to wind / rewind the wire rope.