JP2001341985A - Lifting device and lifting control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device capable of being lifted up and down at a constant speed during normal operation, independently of a body weight, preventing the destruction of electronic parts constituting a power circuit for supplying power to a lifting motor by effectively processing regenerative power generated when the lifting motor is rotated to the direction of lift-down resulting from a fault or electric failure, and more properly maintaining a lift-down speed than usual, and to provide a lifting control method. SOLUTION: This lifting device used for lifting a human body up and down comprises storage means 24 for previously storing the weight of the human body to be lifted up and down, as weight information, and lifting speed control means 20 for controlling a lifting speed, at which the human body is lifted up and down, to be a predetermined constant speed in accordance with the weight information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device, and more particularly to a lifting device and a lifting control method used for lifting and moving a cared person such as an elderly person, a physically handicapped person, and 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, in order to elevate and lower the cared person, for example, an elevating device as shown in FIG. 8 is conventionally used (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 above-mentioned prior art has the following problems. (1) In the conventional apparatus, since the influence of the weight of the cared person on the lifting speed was not sufficiently addressed, the lifting speed sometimes fluctuated depending on the weight of the cared person. That is, when raising the cared person, the rising speed becomes extremely slow when the weight is heavy, and the rising speed becomes fast when the weight is light. Conversely, when lowering the cared person, the lowering speed becomes extremely fast when the weight is heavy, and the lowering speed becomes slow when the weight is light.

(2) In a normal case, the lifting motor is restrained by the brake mechanism even if the power of the lifting motor is turned on, unless an up signal or a down signal is input from the operation switch 68. When the brake is manually released or the brake is manually released, the elevating motor rotates in the downward direction due to the weight of the cared person. Then, even when such a lifting motor is unexpectedly rotated in the downward direction, regenerative power is generated. In the conventional device, since no measures have been taken to effectively treat the regenerative power generated in such a case, the regenerative power flows to the motor power supply circuit side that supplies power to the elevating motor, and this circuit In some cases, the electronic components that make up the device may be destroyed.

(3) Further, in the conventional apparatus shown in FIG. 8, when the elevating motor does not operate due to a power failure or the like,
The lifting operation string 70 is pulled to release the restraint of the lifting / lowering motor by the brake mechanism. At this time, the lifting / lowering motor rotates in the downward direction at a speed according to the weight of the cared person. Also at this time, a regenerative electric power corresponding to the descending speed is generated in the elevating motor, and the regenerative electric power is used by the motor power supply circuit for supplying power to the elevating motor in the same manner as in the above (2). Parts may be damaged. In addition, when the restraint of the brake mechanism is released by manual operation, the care receiver descends at a speed corresponding to the weight of the weight (the size of its own weight). Therefore, attention must be paid to the operation.

The present invention has been made in view of the above circumstances, and has as its object to solve the problems pointed out in the above (1) to (3), that is, to reduce the weight of the body during normal operation. It is possible to move up and down at a predetermined constant speed regardless of this, and also to effectively process the regenerative power generated when the up-down motor is rotated in the down direction due to failure or power failure etc. An object of the present invention is to provide a lifting device and a lifting control method capable of preventing breakdown of electronic components constituting a power supply circuit for supplying power and maintaining a lowering speed more appropriately than before.

[0010]

According to a first aspect of the present invention, there is provided an elevating device for elevating and lowering a human body. And a lifting / lowering speed control means for controlling a lifting / lowering speed for raising / lowering the human body to a predetermined constant speed based on the weight information.

According to a fifth aspect of the present invention, there is provided an elevating control method for elevating a human body, comprising detecting a weight of the human body to be elevated and storing the detected value in advance as weight information. Then, based on the stored weight information, control is performed such that the elevating speed for elevating and lowering the human body becomes a predetermined constant speed.

Thus, the human body can always be raised and lowered at a predetermined constant speed without being affected by the weight of the weight.

According to a second aspect of the present invention, there is provided an elevating device, comprising: an elevating motor for elevating and lowering a human body; and a mode setting means for setting a weight detecting mode for detecting the weight of the human body; When a weight detection mode is set in the mode setting means, the apparatus further includes weight calculation means for calculating the weight of the human body based on the value of a current flowing through the body when the human body is lifted by the elevating motor, The weight value calculated by the weight calculating means is stored as weight information in the storage means.

Thus, the lifting motor is driven,
The human body can always be raised and lowered at a predetermined constant speed without being affected by the weight of the weight.

According to a third aspect of the present invention, in the configuration of the second aspect, the elevating speed control means are arranged in parallel with each other to apply regenerative braking to the elevating motor and have different resistance values. A regenerative braking circuit unit having a plurality of regenerative resistors, and a resistor selecting means for selecting a regenerative resistor based on the weight information from the regenerative resistors and connecting the selected regenerative resistor to the lifting / lowering motor.

For example, when the lifting / lowering motor does not operate due to a power failure or the like and the brake mechanism of the lifting / lowering motor is released, the lifting / lowering motor is rotated in the downward direction to generate regenerative electric power. Of the regenerative resistors constituting the regenerative braking circuit, a resistor having a resistance value corresponding to the weight of the body weight is selected and a regenerative current flows through this resistor.
The descending speed can be adjusted to an appropriate value. Also, it is possible to prevent electronic components constituting a power supply circuit for supplying power to the elevating motor from being damaged by an overvoltage caused by the regenerative voltage.

According to a fourth aspect of the present invention, in the configuration of the third aspect, when the weight information is larger than a predetermined value, the resistance selecting means selects a regenerative resistor having a smaller resistance value. If it is smaller than a predetermined value, a regenerative resistor having a large resistance value is selected.

As a result, when the body weight is heavy, a large amount of regenerative power is consumed, and when the body weight is light, a small amount of the regenerative power is consumed, so that the cared person can always be lowered at an appropriate descending speed according to the weight of the cared person. .

[0019]

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 device, 2 denotes a lifting motor (here, a DC motor), 4 denotes a motor driving circuit for driving the lifting 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 braking circuit for applying regenerative braking to the elevating motor 2, and reference numeral 10 denotes a regenerative braking controller for controlling the regenerative braking circuit 8. . The details of the motor drive circuit 4 and the regenerative braking circuit 8 will be described later.

Reference numeral 12 denotes a rotary encoder, which detects the amount of hoisting and unwinding of the wire by raising / lowering rotation of the lifting / lowering motor 2, and 14 denotes a motor power supply circuit, which supplies electric power to the lifting / lowering motor 2 via the motor driving circuit 4. And also 1
Reference numeral 6 denotes an energizing current detection circuit for detecting an energizing current supplied from the motor power supply circuit 14 to the elevating motor 2 via the motor drive circuit 4.

Reference numeral 18 denotes an operation unit for inputting a command signal for turning on / off the power supply from the motor power supply circuit 14 and rotating the elevating motor 2 up / down.
In this case, a switch for setting a weight detection mode for detecting the weight of the care receiver is provided.

Reference numeral 20 denotes a controller, which controls the motor controller 6 and the regenerative braking controller 10 based on an input command from the operation unit 18 and detection outputs of the energizing current detection circuit 16 and the rotary encoder 12, and includes a CPU and the like. It consists of. Reference numeral 22 denotes a control unit power supply circuit.
0, supplies power to the motor control unit 6, the regenerative braking control unit 10, etc., and 24 denotes a memory, which is configured by a RAM or the like, and stores the weight information of the care receiver calculated by the controller unit 20. I do. In this case, the predetermined constant speed in the claims, that is, the elevating speed for elevating and lowering the human body is stored as a desired value in the memory 24.
It is also preferable to set as an external input.

The operation unit 18 is a mode setting unit in the claims, the controller unit 20 is a weight calculation unit in the same range, the memory 24 is a storage unit in the same range, the controller unit 20 and the motor control unit. 6 respectively correspond to the elevation speed control means in the same range.

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

The motor drive circuit 4 comprises four switching elements Q1 to Q4 such as FETs connected in a bridge type with the lifting motor 2 arranged at the center, and each switching element Q
It comprises bypass diodes D1 to D4 individually connected in parallel to Q1 to Q4, and a normally-off type power supply relay contact RY1. Then, each of the switching elements Q1 to Q4 and the power supply relay contact RY1 is turned on / off.
The off operation is controlled by the motor control unit 6 based on a command from the controller unit 20. Note that B
1 and B2 are connection terminals for connection to the motor power supply circuit 14.

On the other hand, the regenerative braking circuit 8 includes a plurality of regenerative resistors R1, R2,
A latch type selection relay contact RY3 for selecting each of the regenerative resistors R1 and R2, one switching element Q5 composed of an FET or the like connected in series to each of the regenerative resistors R1 and R2, and a normal connected in parallel to the switching element Q5 It has an on-type interlocking relay contact RY2.

In this embodiment, one resistor R1 is set in advance so that the resistance value is smaller than the other resistor R2 (R1 <R2). The switching operation between the selection relay contact RY3 and the switching element Q5 is as follows.
The regenerative braking control unit 10 controls based on a command from the controller unit 20. Further, the power supply relay contact RY1 of the motor drive circuit 4 and the interlocking relay contact RY2 of the regenerative braking circuit section 8 operate interlockingly and complementarily to each other, that is, one power supply relay contact RY
1 is turned on, the other interlocking relay contact RY2 is turned off, and when the one power relay contact RY1 is turned off, the other interlocking relay contact RY2 is turned on.

Here, the selection relay contact RY3 of the regenerative braking circuit section 8 and the regenerative braking control section 10 correspond to a resistance selecting means in the claims.

Next, the operation and operation of the lifting device 1 having the above-described configuration will be described. First, a case where the operation unit 18 is operated to set the weight detection mode for detecting the weight of the care receiver will be described.

When the care receiver is lifted by the suspension belt 62 as shown in FIG. 8, the lifting motor 2 is rotated in the upward direction, and the current flowing from the motor power supply circuit 14 to the lifting motor 2 at this time. Is detected by the conduction current detection circuit 16 using a shunt resistor or the like, and the value I of the conduction current is taken into the controller unit 20. And the controller unit 2
At 0, the weight F of the cared person is calculated based on the following formula based on the value I of the supplied current.

Now, assuming that the rotating shaft torque of the lifting / lowering motor 2 is T, the torque constant is K2, and the radius of the winding drum rotated by the lifting / lowering motor 2 is D, T = K2 · I (1) T = F・ D (2) Therefore, from the above equations (1) and (2), F = K2 · I / D (3)

Here, since K2 and D are known, the controller 20 calculates the weight F of the cared person from the equation (3) based on the value I of the current flowing through the motor 2 for raising and lowering. Then, the information on the weight F is stored in the memory 24. In addition,
This weight information is calculated not only from the value I of the energizing current by the energizing current detection circuit 16 but also from the rotation speed of the elevating motor 2 and the voltage value of the motor power supply circuit 14 which are the detection outputs of the rotary encoder 12. It is also possible.

Further, the controller unit 20 includes the memory 2
4, the regenerative braking control unit 10
In response, the regenerative braking control unit 10 switches the selection relay contact RY3 of the regenerative braking circuit unit 8 to change the resistance R1 or R2 having a resistance value corresponding to the weight of the care receiver.
Select That is, when the weight of the care receiver is larger than a predetermined value, the regenerative resistance R having a small resistance value is obtained.
The first side is selected, and if it is smaller than a predetermined value, the regenerative resistor R2 having a larger resistance value is selected. Here, it is assumed that the selection relay contact RY3 is in a state of being connected to one of the regenerative resistors R1 having a small resistance value because the weight of the care receiver is larger than a predetermined value set in advance.

Next, the regenerative braking control unit 1 utilizes the cared person's weight information stored in the memory 24 as described above.
The operation when the care receiver is raised and lowered by the lifting motor 2 after the selection relay contact RY3 of 0 is switched will be described.

(1) When the power to the elevating motor 2 is turned off (see FIG. 2) In this case, as shown in FIG. 2, the power relay contact RY1 of the motor drive circuit 4 is turned off, and thus the regenerative braking circuit section 8
The interlocking relay contact RY2 is turned on. Moreover,
Since all the switching elements Q1 to Q4 of the motor drive circuit 4 are off, the elevating motor 2 stops operating.

At this time, the switching element Q5 of the regenerative braking circuit 8 is turned off, and the selection relay contact RY3 is connected to one resistor R1.

(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 20 in accordance with the signal. The section 6 is provided with a power supply relay contact R of the motor drive circuit 4.
Turn on Y1. Therefore, the interlocking relay contact RY2 of the regenerative braking circuit 8 is turned off.

Subsequently, when an ascending signal of the ascending / descending motor 2 is inputted from the operating section 18 in order to rotate the ascending / descending motor 2 in the ascending direction, a command from the controller section 20 corresponding to the signal is sent by As shown in FIG. 3, the motor control unit 6 switches one of the switching elements Q2 and Q3 before and after the elevating motor 2 at a predetermined duty ratio based on the weight information, and switches the other switching element Q2. Is turned on, and the remaining switching elements Q1 and Q4 are both turned off.

As a result, a current flows along the path indicated by the dashed arrow in FIG. 3 and the elevating motor 2 is rotated in the ascending direction at a predetermined speed corresponding to the weight of the cared person. For this reason, the cared person is raised at a desired predetermined constant speed regardless of the weight of the weight.

At this time, the switching element Q5 of the regenerative braking circuit 8 is turned off, and the selection relay contact RY3 is connected to one resistor R1.

(3) When the lifting motor 2 is rotated in the downward direction (see FIG. 4). When a power-on signal is input from the operation unit 18, the motor is controlled by a command from the controller unit 20 in accordance with the signal. The section 6 is provided with a power supply relay contact R of the motor drive circuit 4.
Turn on Y1. Therefore, the interlocking relay contact RY2 of the regenerative braking circuit 8 is turned off.

Subsequently, when a lowering signal is input from the operating section 18 in order to rotate the elevating motor 2 in the lowering direction, the motor control section 6 receives a command from the controller section 20 in response thereto. As shown in FIG. 4, one of the switching elements Q1 and Q4 before and after the lifting motor 2 is switched at a predetermined duty ratio based on the weight information, and
The other switching element Q4 is turned on, and the remaining switching elements Q2 and Q3 are both turned off.

As a result, a current flows along a path indicated by a broken arrow in FIG. That is, the lifting motor 2 is
The current flows in the opposite direction to the case (1), and the elevating motor 2 is rotated in the descending direction at a desired predetermined constant speed regardless of the weight of the cared person. That is, the cared person can always raise and lower the human body at a predetermined constant speed without being affected by the weight of the weight.

At this time, the switching element Q5 of the regenerative braking circuit 8 is turned off, and the selection relay contact RY3 is connected to one resistor R1.

As described above, when the cared person is raised or lowered by the lifting / lowering motor 2, the switching element Q1 or Q2 is switched at a duty ratio corresponding to the weight information, and the power supplied to the lifting / lowering motor 2 is reduced. Because of the adjustment, the cared person can always ascend and descend at the desired safe constant speed without being affected by the weight of the cared person.

(4) When the power to the elevating motor 2 is turned on and the elevating motor unexpectedly rotates in the downward direction due to a failure of the brake mechanism or the like (see FIG. 5). As described above, the power supply relay contact RY1 of the motor drive circuit 4 is turned on, so that the regenerative braking circuit unit 8
The interlocking relay contact RY2 is turned off.

In this state, if the elevating motor 2 unexpectedly rotates in the descending direction due to a failure of the brake mechanism even though the elevating signal is not input from the operation unit 18, the elevating motor 2 Generates regenerative power.

In this case, by monitoring the detection output of the rotary encoder 12, the controller 20 can recognize that the motor 2 has unexpectedly rotated in the downward direction. The unit 6 turns on both the switching elements Q3 and Q4 on the left and right sides of the elevating motor 2, and turns off the remaining switching elements Q1 and Q2.

As a result, the front and rear motor 2 is short-circuited through the switching elements Q3 and Q4, so that the regenerative current generated by the motor 2 flows along the path indicated by the solid line arrow in FIG. . That is, when the lifting / lowering motor 2 is unexpectedly rotated in the downward direction due to the failure of the brake mechanism, regenerative power is consumed by the rotor inside the lifting / lowering motor 2, and as a result, the motor power supply circuit 14 and the controller It is prevented that the regenerative power is continuously applied to the electronic components constituting the electronic component 20 and the like, and the electronic components are broken. Moreover, since the regenerative braking is applied to the elevating motor 2, the cared person can be lowered at an appropriate descent speed, and the safety is enhanced.

At this time, even if the operation section 18 is operated, the controller section 20 does not accept the input.

(5) Manual lifting motor 2 for power failure
Release the brake and rotate in the downward direction (Fig. 6
When a power failure or the like occurs, the motor drive circuit 4 is in the same connection state as that shown in FIG. That is, as shown in FIG. 6, the power supply relay contact RY1 of the motor drive circuit 4 is turned off,
Therefore, the interlocking relay contact RY2 of the regenerative braking circuit 8 is turned on, and the switching elements Q1 to Q4 are turned off. Further, since the weight of the care receiver is larger than a predetermined value, the selection relay contact RY3 is in a state where one resistor R1 is selected. The switching element Q5 of the regenerative braking circuit 8 is off.

In this state, when the brake of the lifting / lowering motor 2 is manually released and rotated in the downward direction, the lifting / lowering motor 2
Generates regenerative power. In this case, the regenerative current generated by the elevating motor 2 flows along a path indicated by a solid arrow in FIG. That is, the regenerative current flows through the diode D1, the selection relay contact RY3, the regenerative resistor R1, and the interlocking relay contact RY2, and as a result, the electronic components constituting the motor power supply circuit 14, the controller unit 20, and the like are destroyed by the regenerative power. Is prevented. Also, the regenerative power generated when the cared person's weight is heavy is the resistance R1 having a small resistance value.
Regenerative braking increases because
The lowering can always be performed at an appropriate lowering speed according to the weight of the care receiver.

FIG. 6 shows the case where the selection relay contact RY3 selects one of the regenerative resistors R1 because the weight of the cared person is heavy and larger than a predetermined value. When the weight of the person is light and smaller than a predetermined value, as shown in FIG.
Y3 selects the other regenerative resistor R1.

In this case, when the brake of the lifting / lowering motor 2 is manually released and rotated in the downward direction, regenerative electric power is generated in the lifting / lowering motor 2 in the same manner. It flows along the route indicated by the solid arrow in the middle. That is, the regenerative current is the diode D1, the selection relay contact RY
3. Flow through the regenerative resistor R2 and the interlocking relay contact RY2, and as a result, electronic components constituting the motor power supply circuit 14, the controller unit 20, and the like are prevented from being destroyed by the regenerative power. In addition, the regenerative power generated in this case is consumed through the regenerative resistor R2 having a large resistance value, and can always be lowered at an appropriate descent speed according to the weight of the care receiver.

In the above embodiment, two regenerative resistors R1 and R2 are provided. However, more regenerative resistors are provided in parallel, and the regenerative resistor according to the weight is selected by the selection relay contact 3. A configuration is also possible.

In this embodiment, in order to obtain the weight information with a relatively simple configuration, the weight F of the cared person is determined based on the value I of the current flowing through the motor 2.
Is calculated, but it is also possible to calculate the weight of the cared person based on the power supply voltage of the motor power supply circuit 14 and the rotation speed of the lifting / lowering motor 2.

Further, in this embodiment, the ascending and descending speed is controlled by switching the switching elements Q1 and Q2, but the electromagnetic brake mechanism is turned on / off.
It is also possible to control the elevating speed by performing off-control.

[0060]

According to the first and second embodiments of the present invention, the present invention is embodied as in the above-described embodiment, and the up-and-down control method according to the fifth aspect drives the elevating motor. Thus, the human body can always be raised and lowered at a predetermined constant speed without being affected by the weight of the weight. In particular, even in the case of a person with a heavy weight, the lowering speed can be maintained more appropriately than before without rapidly lowering

In the elevating device according to the third aspect, for example, when the elevating motor does not operate due to a power failure or the like,
As a result of releasing the brake mechanism of the lifting / lowering motor, when the lifting / lowering motor is rotated in the downward direction to generate regenerative power, the resistance corresponding to the weight of the regenerative resistance constituting the regenerative braking circuit unit is selected. Since a resistor having a value is selected and a regenerative current flows through this resistor, the descending speed can be adjusted to an appropriate value. Also, it is possible to prevent electronic components constituting a power supply circuit for supplying power to the elevating motor from being damaged by an overvoltage caused by the regenerative voltage.

In the lifting device according to the fourth aspect, when the weight is heavy, a large amount of regenerative electric power is consumed, and when the weight is light, a small amount of the regenerative electric power is consumed. It can be lowered at the lowering speed.

[0063]

[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 in a case where a lifting / lowering motor unexpectedly rotates in a downward direction due to a failure of a brake mechanism or the like when a motor power supply circuit is turned on.

FIG. 6 is a circuit diagram showing a connection state of a motor drive circuit and a regenerative braking circuit when a heavy load is applied in a case where a brake of an elevating motor is manually released and rotated in a descending direction due to a power failure or the like. is there.

FIG. 7 is a circuit diagram showing a connection state of a motor drive circuit and a regenerative braking circuit when a light load is applied when manually releasing a brake of an elevating motor and rotating the motor in a descending direction due to a power failure or the like; is there.

FIG. 8 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 regenerative braking control unit 12 rotary encoder 14 motor power supply circuit 16 conduction current detection circuit 18 operation unit 20 controller unit 24 memory Q1 to Q5 switching elements RY1 Power relay contact RY2 Interlock relay contact RY2 Selection relay contact R1, R2 Regenerative resistor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02P 7/00 H02P 7/00 B (72) Inventor Narimichi Murogaki 1048 Ojidomazuma, Kazuma, Osaka Matsushita Electric Works Ryoji Enozono, Inventor Ryoji Enozono 1048, Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Works F-term (reference) 3F204 AA03 BA02 CA05 FA04 FB05 FC08 FD02 5H570 AA07 BB09 BB11 CC01 DD01 EE01 EE03 FF03 FF07 FF10 GG04 JJ03 JJ17 LL02 LL16 LL29

Claims (5)

[Claims] 1. A lifting device for raising and lowering a human body, a storage means for storing the weight of the human body to be raised and lowered as weight information in advance, and a lifting and lowering speed for raising and lowering the human body being a predetermined constant speed based on the weight information. Lifting / lowering speed control means for performing such control. 2. A mode setting means comprising an elevating motor for elevating and lowering a human body, and setting a weight detection mode for detecting the weight of the human body, and elevating and lowering when a weight detection mode is set in the mode setting means. Weight calculating means for calculating the weight of the human body based on the value of the current flowing through the body when the human body is raised by the motor for weight, and the weight calculated by the weight calculating means as weight information in the storage means. The lifting device according to claim 1, wherein the value is stored. 3. The lifting speed control means are arranged in parallel with each other for applying regenerative braking to the lifting motor.
The lifting / lowering device according to claim 2, further comprising: a regenerative braking circuit having a plurality of regenerative resistors having different resistance values; and resistance selecting means for selecting a regenerative resistor based on the weight information from the regenerative resistors and connecting the selected regenerative resistor to a lifting / lowering motor. apparatus. 4. The resistance selecting means selects a regenerative resistor having a small resistance value when the weight information is larger than a predetermined value, and selects a regenerative resistor when the weight information is smaller than the predetermined value. The lifting device according to claim 3, wherein a large regenerative resistance is selected. 5. A lift control method for raising and lowering a human body, comprising detecting a weight of the human body to be raised and lowered, storing the detected value as weight information in advance, and raising and lowering the human body based on the stored weight information. A lifting / lowering control method, wherein the lifting / lowering speed to be controlled is controlled to be a predetermined constant speed.