JP2001341978A - Elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator for preventing breakdown of an electronic part constituting a power circuit for supplying a power source to a lifting motor by effectively treating regenerative power generated when rotating the lifting motor in the lowering direction and capable of more properly maintaining a lowering speed than in the conventional one without depending on the body weight of a person to be cared. SOLUTION: A regenerative braking circuit part 8 having a power source interlocking switch turned on when a motor power circuit 10 for supplying electric power to the lifting motor 2 is in an OFF state and turned off in an ON state, is connected to both ends of the lifting motor 2 lifted and driven by a motor driving circuit 4, and this regenerative braking circuit part 8 performs regenerative braking by a regenerative current carried when the motor power ciruit 10 is in an OFF state and the lifting motor 2 is rotated in the lowering direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device, and more particularly to an elevating device used for lifting and moving a cared person such as an elderly person, a physically handicapped person or a patient.

[0002]

2. Description of the Related Art In general, when a cared person such as an elderly person, a physically handicapped person, or a patient is laid on a bed or bathed, the cared person may need to be lifted and moved. As described above, conventionally, for example, an elevating device as shown in FIG. 7 is used to elevate and lower the care receiver (see Japanese Utility Model Laid-Open No. 6-44376).

In this elevating device, an apparatus main body 50 is provided so as to be able to travel along a rail 54 provided on a gantry 52, and an elevating motor,
A winding drum driven by the lifting motor,
An electromagnetic brake mechanism that restrains the rotation of the lifting motor,
And a control circuit for controlling them (both not shown)
The base end side of the wire 56 is fixed to the winding drum, and an intermediate portion of the wire 56 is wound. The distal end of the wire 56 is pulled out of the apparatus main body 50 to the outside, and a hanger part 60 is attached to the end of the wire 56 via a hanger 58, and a hanger belt 62 is hung on the hanger part 60. . Further, the device body 5
0 is connected to a power cord 64 disposed along the gantry 52 and the rail 54, and to an operation switch 68 via a control cable 66.

When an ascending signal or a descending signal is input by operating the operation switch 68, the restraint of the elevating motor by the brake mechanism is electromagnetically released in response to the signal, and the elevating / lowering mechanism in the apparatus main body 50 is released. The wire 56 is wound up or down by the winding drum by the forward or reverse rotation of the motor for the
Moves up and down, and the care receiver is raised and lowered.

Further, the lifting device is provided with a manual lowering operation cord 70 in order to cope with a state in which the care receiver is lifted upward and a power failure or the like occurs. Is pulled down, the restraint of the elevating motor by the brake mechanism in the apparatus main body 50 is mechanically released, and the care receiver can descend by its own weight.
If it is uneasy to accelerate when descending, the lifting motor is braked and stopped when the hand is released from the descending operation cord 70.

[0006]

However, the conventional lifting device shown in FIG. 7 has the following problems. That is, if the elevating motor stops operating due to a power failure or the like while the care receiver is suspended by the suspension belt 62, the descent operation cord 70 is pulled to restrain the elevating motor by the brake mechanism. At this time, the elevating motor rotates in the descending direction at a speed according to the weight of the cared person. Also,
When the motor power circuit for driving the elevating motor is in the off state, the rotation of the elevating motor is restrained by a brake mechanism. Motor unexpectedly rotates downward.

When the elevating motor rotates in the descending direction, regenerative electric power having a magnitude corresponding to the descending speed is generated in the elevating motor. In the conventional device shown in FIG. 7, since no measures have been taken to effectively process the regenerative power generated in such a case, the regenerative power constitutes a motor power supply circuit for supplying power to the elevating motor. To the electronic component side, and the electronic component forming the circuit may be destroyed.

Further, when the restraint of the brake mechanism is released by manual operation or when the brake mechanism fails, the cared person descends at a speed corresponding to the weight of the weight (the size of its own weight). In addition, it is difficult to adjust the descending speed to an appropriate value. In particular, a care receiver having a heavier weight descends at a higher speed, so that the operation requires attention.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to effectively process regenerative power generated when a lifting / lowering motor is rotated in a downward direction to supply power to the lifting / lowering motor. It is an object of the present invention to provide an elevating device that prevents electronic components constituting a motor power supply circuit that supplies electric power from being destroyed and that can maintain a lowering speed more appropriately than in the past without depending on the weight of the cared person.

[0010]

According to a first aspect of the present invention, there is provided an elevating apparatus, comprising:
A regenerative braking circuit unit having a power supply interlocking switch that is turned on when the motor power supply circuit that supplies power to the motor for raising and lowering is off and turned off when on is connected, and the regenerative braking circuit unit is a motor power circuit. In the off state, the regenerative braking is performed by a regenerative current that is supplied when the lifting / lowering motor is rotated in the downward direction.

Thus, when the motor for powering down is rotated with the motor power supply circuit turned off and regenerative electric power is generated as in the case where the motor power supply circuit is turned off, such as when the motor is lowered manually due to a brake failure or power failure, etc. Since the regenerative current flows through the regenerative braking circuit and is subjected to regenerative braking, the electronic components of the motor power supply circuit that controls the motor for lifting and lowering are prevented from being destroyed.
The cared person can be lowered while maintaining the lowering speed appropriately without depending on the weight of the cared person's weight.

In the lifting device according to a second aspect of the present invention, in addition to the configuration of the lifting device according to the first aspect of the present invention, a regenerative resistor for adjusting a descending speed is provided in the regenerative braking circuit.

Thus, if the resistance value of the regenerative resistance is previously set to an appropriate value according to the weight of the cared person, an appropriate value is always obtained regardless of the weight of the cared person. Can be lowered at speed.

[0014]

FIG. 1 is a block diagram showing a main configuration of an electric control system of a lifting device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes the entire lifting / lowering device, 2 denotes a lifting / lowering motor (here, a DC motor), 4 denotes a motor driving circuit for driving the lifting / lowering motor 2,
Reference numeral 6 denotes a motor control unit that controls the elevating motor 2 via the motor drive circuit 4.

Reference numeral 8 denotes a regenerative resistor circuit for processing regenerative electric power generated by the lifting / lowering motor 2. The details of the motor drive circuit 4 and the regenerative braking circuit 8 will be described later.

Reference numeral 10 denotes a motor power supply circuit for supplying electric power to the elevating motor 2 via the motor drive circuit 4. Reference numeral 12 denotes an operation unit, which inputs a command signal for turning on / off the power supply from the motor power supply circuit 10 and rotating the elevating motor 2 up / down, and 14 denotes a controller unit, which is an input from the operation unit 12. The controller controls the motor control unit 6, the regenerative braking circuit unit 8, and the motor power supply circuit 10 based on a command, and includes a CPU and the like. Also, 1
A control unit power supply circuit 6 supplies power to the controller unit 14 and the motor control unit 6.

FIG. 2 is a circuit diagram showing details of the motor drive circuit 4 and the regenerative braking circuit section 8.

The motor drive circuit 4 includes switching relay contacts RY2 and RY3 for switching the up / down motor 2 between up rotation and down rotation, and power supply from the motor power supply circuit 10 to the up / down motor 2. And a normally-off type power supply relay contact RY1a for turning on / off the power supply. The on / off operation of the switching relay contacts RY2 and RY3 and the power relay contact RY1a is controlled by the motor control unit 6 based on a command from the controller unit 14.

On the other hand, the regenerative braking circuit section 8 is provided with a normally-on type interlocking relay contact RY1b in the middle of a short circuit that short-circuits both ends of the elevating motor 2, and turns on / off the interlocking relay contact RY1b. The OFF operation is linked to the power supply relay contact RY1a of the motor drive circuit 4. That is, when the power supply relay contact RY1a is turned on and power can be supplied to the elevating motor 2, the interlocking relay contact RY1b is turned off and the power supply relay contact RY is turned off.
The interlocking relay contact RY1b is turned on when 1a is turned off and power cannot be supplied to the elevating motor 2. The interlock relay contact RY1b corresponds to a power interlock switch in the claims.

Next, the operation and operation of the lifting device 1 having the above-described configuration will be described.

(1) When the motor power supply circuit for the elevating motor 2 is off (see FIG. 2) In this case, as shown in FIG. 2, the power supply relay contact RY1a of the motor drive circuit 4 is off. Since no electric power is supplied to the elevating motor 2, the elevating motor 2 stops operating. At this time, the power supply relay contact RY1
Since a is off, the relay contact RY1 of the regenerative braking circuit 8
b is in the ON state.

In this state, the switching relay contact R
It is assumed that the common contact x of Y2 and Y3 is connected to one of the individual contacts y.

(2) When the lifting motor 2 is rotated in the ascending direction (see FIG. 3) When a power-on signal is input by the operation unit 18, the motor control is performed by a command from the controller unit 14 in accordance with the signal. The unit 6 includes, as shown in FIG.
The power supply relay contact RY1a is turned on. In response, the interlocking relay contact RY1b of the regenerative braking circuit 8 is turned off.

Subsequently, when an ascending signal of the ascending / descending motor 2 is input from the operation unit 18, the motor control unit 6 responds to a command from the controller unit 14 to switch the switching relay contacts RY2, RY3. Are connected to each other so that the elevating motor 2 rotates in the ascending direction, that is, the common contact x is connected to one of the individual contacts y.

As a result, a current flows along the path indicated by the broken line arrow in FIG. 3 and the elevating motor 2 is rotated in the ascending direction at a predetermined speed.

(3) When the lifting / lowering motor 2 is normally rotated in the downward direction (see FIG. 4). When a power-on signal is input by the operation unit 18, a command from the controller unit 14 corresponding to the signal turns on. As shown in FIG. 4, the motor control unit 6
The power supply relay contact RY1a is turned on. In response, the interlocking relay contact RY1b of the regenerative braking circuit 8 is turned off.

Subsequently, when a lowering signal of the elevating motor 2 is input from the operation unit 12, the motor control unit 6 responds to a command from the controller unit 14 to switch the switching relay contacts RY2, RY3. Are connected in such a manner that the elevating motor 2 rotates in the descending direction, that is, the common contact x is connected to the other individual contact z side.

As a result, a current flows along a path indicated by a broken arrow in FIG. That is, the lifting motor 2 has
Since the current flows in a direction opposite to that of FIG. 3, the motor is rotated in a downward direction at a predetermined speed.

(4) Manual lifting motor 2 for power failure
(See FIG. 5) When a sudden power failure or the like occurs while the care receiver is suspended by the suspension belt 62, the power supply relay contact RY1a of the motor drive circuit 4 is basically turned off ( The connection state is the same as in FIG. That is, as shown in FIG. 5, the power relay contact RY1 of the motor drive circuit 4 is turned off, and accordingly, the interlocking relay contact RY1b of the regenerative braking circuit 8 is turned on. As a result, both ends of the elevating motor 2 are short-circuited via the interlocking relay contact RY1b. In this state, the common contact x of the switching relay contacts RY2, RY3 is connected to one of the individual contacts y.

At this time, when the lowering operation cord 70 as shown in FIG. 7 is operated to mechanically release the restraint of the lifting / lowering motor 2 by the brake mechanism, the lifting / lowering motor 2 is lowered by its own weight of the cared person. , The regenerative electric power is generated in the elevating motor 2. In this case, the regenerative current generated by the elevating motor 2 flows along the path indicated by the solid arrow in FIG.

That is, the regenerative current generated in the elevating motor 2 flows through the interlocking relay contact RY1b in a short-circuit manner, so that the regenerative power is consumed by the rotor of the elevating motor 2,
As a result, it is possible to prevent the regenerative power from being continuously applied to the electronic components constituting the motor power supply circuit 10 and the controller unit 14 and the like and to be prevented from being broken. At the same time, since the regenerative braking is applied to the elevating motor 2, the cared person can be lowered at a safe speed.

In the embodiment shown in FIGS. 2 to 5,
The regenerative electric power generated by the rotation of the elevating motor 2 in the descending direction is consumed by the rotor of the elevating motor 2 to apply the rotational braking. However, as shown in FIG. A regenerative resistor Rx may be connected in series to the interlocking relay contact RY1b of the unit 8.

With this configuration, if the resistance value of the regenerative resistor Rx is set in advance to an appropriate value according to the weight of the cared person, regardless of the weight of the cared person, It is more convenient because it can always be lowered at an appropriate speed.

In the above embodiment, the case where the brake mechanism of the elevating motor 2 is manually released for a power failure or the like has been described. However, when the power supply relay contact RY1a is off, the elevating motor 2 is turned off. Even when the brake mechanism is out of order, if the elevating motor 2 unexpectedly rotates downward due to the weight of the care receiver, regenerative electric power is generated in association with this. 2
By flowing the regenerative electric power generated in the above through the interlocking relay contact RY1b, it becomes possible to apply the regenerative braking.

The up-and-down rotation of the elevating motor 2 is performed by the relay contacts RY2 and RY3. However, transistors can be used instead of the relay contacts RY2 and RY3.

[0037]

The present invention is embodied as in the above-mentioned embodiment. In the elevating device according to the first aspect of the present invention, as in the case where the motor is lowered by manual operation due to a brake failure, a power failure, or the like, If the lifting motor is rotated in the downward direction while the power supply circuit is off and regenerative power is generated, the regenerative current flows to the regenerative braking circuit and is subjected to regenerative braking. The electronic components of the circuit are prevented from being destroyed, and the cared person can be lowered while maintaining the lowering speed appropriately without depending on the weight of the cared person.

In the lifting device according to the second aspect, if the resistance value of the regenerative resistance is set in advance to an appropriate value according to the weight of the cared person, the weight of the cared person can be reduced. It can always be lowered at an appropriate speed regardless of the weight.

[0039]

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of an electric control system of a lifting device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a detailed configuration of a motor drive circuit and a regenerative braking circuit of the elevating device shown in FIG.

FIG. 3 is a circuit diagram showing a connection state of a motor drive circuit and a regenerative braking circuit when a lifting motor is rotated in a rising direction.

FIG. 4 is a circuit diagram showing a connection state of a motor drive circuit and a regenerative braking circuit when a motor for lifting and lowering is normally rotated in a downward direction.

FIG. 5 is a circuit diagram showing a connection state of a motor drive circuit and a regenerative braking circuit unit when the elevating motor rotates in a downward direction in a state where the motor drive power supply circuit is turned off due to a power failure or the like.

FIG. 6 is a circuit diagram showing a modification of the regenerative braking circuit of the lifting device according to the present invention.

FIG. 7 is a front view showing the entire configuration of the lifting device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lifting device 2 lifting motor 4 motor drive circuit 6 motor control unit 8 regenerative braking circuit unit 10 motor power supply circuit 12 operation unit 14 controller unit RY1a power supply relay contact RY1b interlocking relay contact RY2, RY3 switching relay contact Rx regeneration resistor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Narumichi Murogaki 1048, Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside the Matsushita Electric Works Co., Ltd. F term (reference) 3F204 AA03 BA02 CA05 FA04 FB05 FC08 FD02 5H530 AA12 BB26 BB27 CC09 CC11 CC23 CE16 CF05 EE03

Claims (2)

[Claims] 1. A power supply interlocking switch which is turned on when a motor power supply circuit for supplying power to the elevating motor is turned off and turned off when it is turned on is provided at both ends of the elevating motor which is driven up and down by a motor driving circuit. A regenerative braking circuit unit having the regenerative braking circuit unit, wherein the regenerative braking circuit unit performs regenerative braking with a regenerative current that is supplied when the elevating motor is rotated in a downward direction while the motor power supply circuit is off. Lifting device. 2. The elevating device according to claim 1, wherein a regenerative resistor for lowering the speed is provided in the regenerative braking circuit.