JP2589646Y2 - Device for detecting breakage of hoist wire / belt - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for electrically detecting breakage of a wire belt or the like in a hoist which raises and lowers an elevating body by winding and sending out a wire belt or the like.

[0002]

2. Description of the Related Art Hitherto, a hoist for raising and lowering an elevating body by winding and sending out a wire belt or the like is provided with a breakage detecting device for detecting breakage of the wire belt or the like in order to prevent danger. As shown in FIG. 7, the rupture detection device includes a flange 24 provided at the lower end of a plurality of suspension belts 21 wound around a winding drum (not shown) and suspending an elevating body 23 via a spring 22. Pin 25
And a break detection switch 26 provided on the lift 23. The break detecting device 20 is provided for each suspension belt 2.
It is provided for each one. In the break detection device 20, a break detection switch 26 is operated by a pin 25 that falls when the suspension belt 21 breaks, and detects the break of the suspension belt 21. Pin 25 is its own weight and spring 2
Fall due to the elasticity of 2.

[0003]

However, such a breakage detecting device has the following problems. (1) A pin drop stroke is required, and a large installation space is required. (2) Since all the belts are provided, the elevating body tends to be large. (3) Due to the weight, the driving device for winding the belt needs a large driving device having a large driving force.

[0004]

According to the present invention, first, in a hoist for raising and lowering the elevating body by winding up and sending out a wire belt or the like on which the elevating body is suspended, reciprocating along the longitudinal direction of the wire belt or the like. Second, a plurality of wires suspending the elevating body by a break detection device provided with a break detection line provided as above, and a break detection unit connected to the break detection line and detecting breakage of the break detection line. A hoist that raises and lowers the elevating body by winding and sending out a metal belt or the like; a connection line that electrically connects the wires or the metal belts to each other in series; and a wire that is connected to the wire or the metal belt or the like. The above-mentioned problem has been solved by a rupture detecting device provided with rupture detecting means for detecting rupture of a metal belt or the like.

[0005]

The rupture detection line of the first rupture detection device is a wire
When the belt is wound up and sent out, it is wound up and sent out integrally with a wire belt or the like.
Further, a current flows through the break detection line. If the wire belt breaks for some reason, the break detection line also breaks at the same time, and no current flows through the break detection line. The break detecting means detects break of the break detection line when the current stops flowing.

[0006] The break detection lines may be connected in series to the break detection means. In addition, since the break detection line is provided reciprocally on a wire belt or the like, when the break detection means is connected to each break detection line, the first break detection device determines which specific wire belt or the like has broken. Can be detected.

[0007] A plurality of wires, metal belts, etc. of the second breakage detecting device are electrically connected in series by connecting wires.
An electric current flows through the wire, the metal belt, and the like. If any of a plurality of wire / metal belts breaks due to some cause, the wire / metal belt etc.
The current stops flowing. The rupture detecting means detects rupture of a wire, a metal belt, or the like when the current stops flowing.

That is, the first and second rupture detecting devices are:
A current is caused to flow along the hoist wire / belt or the like, and the breakage of the belt is detected by utilizing the interruption of the current due to the breakage of the belt.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The hoist 30 includes a self-propelled carrier 31 (FIG. 2).
Reference). The self-propelled transport vehicle 31 has a driving roller 32 and a driven roller 33 on a rail R laid at a high place.
And it is adapted to run. Drive roller 32
Are rotated by a drive motor (not shown).

The hoist 30 (see FIGS. 1 and 2) has four belts 41, 42, 43, 44 and a lifting motor 45. One end of each of the four belts 41, 42, 43, and 44 is wound around a hoist drum 46, the other end is connected to a hanger (elevating body) 47 that suspends a conveyed object, and an intermediate portion is supported by an idler roller 48. The hoist drum 46 is connected to a lifting motor 45 by a chain 49.

Break detection lines 51, 52, 53 and 54 are embedded in each of the belts 41, 42, 43 and 44 (see FIG. 1). The break detection lines 51, 52, 53, 54 are embedded in the resin belts 41, 42, 43, 44 in a longitudinal direction. In general, a wire is integrally embedded in the belt as a core wire with an adhesive, and this wire may be used as the break detection wires 51, 52, 53, 54. The tensile strength of the belt is determined depending on the strength of the wire.

The ends of the break detection lines 51, 52, 53, 54 are embedded in the support shaft 34 of the winding drum 46,
It is connected to eight conductors 55. Each conductor 55
A metal ring provided integrally on the outer periphery of the support shaft 34. A contact 56 is in contact with each conductor 55 by a spring (not shown).

A pair of contacts 56, 56 (see FIG. 3) corresponding to the belts 41, 42, 43, 44, break detection lines 51, 52, 53, 54, and a detection control relay (break detection means, Below, the control relay is "CR"
Called. ) 61, 62, 63, 64 are connected in series with each other to form break detection paths 66, 67, 68, 69. The break detection paths 66, 67, 68, 69 are connected in parallel with break notification paths 71, 72, 73, 74. The breaking notification paths 71, 72, 73, 74
Notification CR57 and pilot lamp 5 connected in series
8. Instead of the pilot lamp 58, a warning light, a bell, a siren, or the like may be used.

The belt indicated by reference numeral 41 has a reference numeral 6
A break detection path indicated by reference numeral 6 corresponds to a break notification path indicated by reference number 71, and a belt indicated by reference number 42 corresponds to a break detection path indicated by reference number 67 and a break notification path indicated by reference number 72, and a belt indicated by reference number 43. Corresponds to a break detection path indicated by reference numeral 68 and a break notification path indicated by reference numeral 73.
Each of the break notification paths indicated by.

The break detection paths 66, 67, 68, 69 include a motor up rotation path 59 and a motor down rotation path 6.
0 are connected in parallel via the changeover switch 65. The changeover switch 65 selectively connects the motor up rotation path 59 and the motor down rotation path 60 to a power source.

The motor ascending rotation path 59 includes a path opening CR 70, an ascending overcurrent relay 75, a descending CR 76, and an ascending magnet coil (hereinafter, the magnet coil is referred to as "MC") 77 connected in series. It is composed of The route opening CR 70 includes the detection CRs 61, 62, 6
3, 64 are connected in series, and in FIG. 3, the detection CRs 61,
62, 63, and 64 are sequentially magnetically corresponded.

The motor lowering rotation path 60 also includes a path opening CR 78, a lowering overcurrent relay 79, a raising CR 80, and a lowering MC 81 connected in series. The route opening CRs 78 are also connected in series by the same number as the detection CRs 61, 62, 63, 64. In FIG. 3, the detection CRs 61, 62, 6 are arranged in order from the left end route opening CR 78.
3, 64 are sequentially magnetically corresponded.

The lifting motor 45 (see FIG. 4) is a three-phase motor. Each of the three-phase power cords has a belt 41, 42,
The ascending CR 82 and the descending CR 83, which switch the rotation direction of the elevating motor 45 between the direction in which the 43 and 44 are wound up and the direction in which they are sent out, are connected. An overcurrent relay 84 for protecting the lifting motor 45 is also connected to each power cord.

Next, the operation will be described. Changeover switch 65
(See FIG. 3) is assumed to be switched to the motor up rotation path 59 side. When the DC power of about 24V is turned on,
Current flows through the four break detection paths 66, 67, 68, 69. The four detection CRs 61, 62, 63, and 64 are all in the ON state, and the corresponding path opening CRs 70 are simultaneously in the ON state.
57 is turned off.

When the four path opening CRs 70 are turned on, a current flows through the motor ascending rotation path 59. Then
The ascending MC 77 turns off the ascending CR 80,
The current is prevented from flowing to the motor descending rotation path 60 by mistake. The lifting MC 77 is provided with a lifting motor 45 (FIG. 4).
3) are turned on. As a result, the lifting motor 45 winds up the four belts 41, 42, 43, 44 by the winding drum 46. On the other hand, since the four notification CRs 57 are in the OFF state, current does not flow through the four break notification paths 71, 72, 73, 74 even when the power is turned on. Therefore,
Each pilot lamp 58 remains off.

When the changeover switch 65 is switched to the motor lowering rotation path 60, a current flows through the motor lowering rotation path 60, and the lowering MC 81 becomes the lowering CR.
The motor 76 is turned off to prevent current from flowing erroneously through the motor elevating rotation path 59, and the lowering CR 83 of the elevating motor 45 is turned on to rotate the elevating motor 45 in the belt sending direction.

Each of the break detection lines 51, 52, 53, 54 (see FIG. 1) is fed with the belt 41, 42, 43, 44 as the belt 41, 42, 43, 44 is wound up.
4 and rolled up or sent out. Usually, a current flows through the break detection lines 51, 52, 53, 54. For example, if the belt indicated by reference numeral 41 breaks due to long-term use or suspension of a conveyed object exceeding the weight limit, the break detection line 5 embedded in the belt 41
1 also breaks at the same time, and no current flows through the break detection line 51.

Then, the detection CR 61 connected to the break detection line 51 is turned off, and the break of the belt 41 is detected. When the detection CR 61 is turned off, the notification CR 57 corresponding to the detection CR 61 is turned on, so that current flows only through the break notification path indicated by reference numeral 71. Thereby, the pilot lamp 58 of the break notification path 71 corresponding to the broken belt 41 is turned on,
The worker can know that the belt 41 is broken.

On the other hand, when the detecting CR 61 is turned off, the corresponding CR 7 for opening the path at the left end in FIG.
0 is also set to the OFF state so that no current flows through the motor ascending rotation path 59. Then, the ascending MC 77 turns the three ascending CRs 82 of the elevating motor 45 (see FIG. 4) into OF.
The state is set to the F state, and the lifting motor 45 is stopped urgently. As a result, the hanger 47 that is rising is stopped.

Although the hoist 30 described above uses a belt, a wire may be used.

As shown in FIGS. 5 and 6, in the case of the hoist 230 in which the hanger 247 is hung by the aluminum belts 241, 242, 243 and 244, the belt itself is cut off as shown in FIGS. The belt 241, 242, 243, 244 is also used as the detection line, and
2, 293 may be electrically connected in series. Also in this case, as shown in FIG. 6, two of the four belts may be connected in series to form two parallel break detection circuits 266 and 267. In place of the aluminum belt, a metal suspension body such as a wire, a chain, a steel strip, etc., which can conduct current and can be wound up and sent out may be used.

In the embodiment shown in FIGS. 5 and 6, FIG.
1 to 4 are denoted by adding 2 to the first reference numerals shown in FIGS. 1 to 4, and the description of those parts is omitted.

In the embodiment shown in FIGS. 5 and 6, for example, if the belt indicated by reference numeral 241 breaks, the detecting C
R (rupture detection means) 263, 285
1 is detected, the lift motor (not shown) is stopped, and the pilot lamps 258 and 287 are turned on.

The motor-up rotation path 59 (see FIG. 3) and 259 (see FIG. 6) and the motor-down rotation path 60
(See FIG. 3) and 260 (see FIG. 6) may be replaced by a sequencer (not shown).

[0030]

The break detecting devices according to the first and second aspects of the present invention have the following effects because pins, springs, break detecting switches, and the like, which are conventionally required, become unnecessary. (1) The structure can be simplified and lightened. (2) The installation space can be reduced. (3) The lifting body can be reduced in size. (4) The driving force of a driving device for winding up a belt or the like can be made smaller than before, and a small driving device can be used. (5) Since the pin and the break detection switch become unnecessary, there is no need to adjust the relative positional relationship between the pin and the break detection switch, which has been performed during the conventional assembly.
In the installation of the breakage detection device, almost only the connection work of the electric circuit is required, so that the installation time can be shortened, and the maintenance after the installation becomes unnecessary. (6) Unlike the conventional case where the belt is detected by dropping the pins, the detection is performed electrically, so that the breakage of the belt can be detected almost instantaneously and reliably.

[Brief description of the drawings]

FIG. 1 is a perspective view of a belt of a hoist in which a breakage detecting device according to an embodiment of the present invention is incorporated.

FIG. 2 is a front view of the self-propelled carrier into which the hoist of FIG. 1 is incorporated.

FIG. 3 is a circuit diagram of the breakage detection device of FIG. 1;

FIG. 4 is a power supply circuit diagram of a hoist elevating motor.

FIG. 5 is a perspective view of a belt related to a hoist in which a breakage detecting device according to another embodiment is incorporated.

FIG. 6 is a circuit diagram of the breakage detection device of FIG.

FIG. 7 is a front view of a conventional breakage detection device.

[Explanation of symbols]

30,230 Hoist 41,42,43,44,241,242,243,2
44 Belt 51, 52, 53, 54 Break detection line 61, 62, 63, 64, 263, 264 Detection control relay (break detection means) 292, 293 Connection line

Claims (2)

(57) [Scope of request for utility model registration] A hoist for raising and lowering the elevating body by hoisting and sending out a wire belt or the like on which the elevating body is hung; a break detection line provided to reciprocate along a longitudinal direction of the wire belt or the like; A rupture detecting device, such as a wire / belt of a hoist, comprising a rupture detecting means connected to the detection line and detecting rupture of the rupture detection line. 2. A hoist for lifting the lifting member by winding-up delivery, such as a plurality of wire metal base <br/> belt which hung vertically movable body, wherein the wire metal belts such as the
Connecting lines for electrically connecting the wires in series,
Break detection means for detecting breakage of the wire, metal belt, etc., connected to a belt made of metal or the like ,
Breakage detection device for hoist wire and metal belt.