JPH10139315A - Stairs climbing-up device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce shock generating when a safety device has operated by improving the detection accuracy of the safety device operating at the time of abnormal speed. SOLUTION: The number of rotation of climbing-up motor built in a main body 1 is detected as the number of pulse by an optical sensor 10. A counter sensor 16 counts the pulse number for a specified time, and when the counted value exceeds a predetermined value a stop signal is output to operate an emergency stop device 17. As the determination reference of the counter 16 the cycle of a commercial power supply is used. Through the determination with the comparison between the number of the elevation motor and the reference value, the accuracy of detecting abnormality of elevation speed is improved, thereby enabling the detection even in the case of minute abnormality of elevation speed. Therefore even at the time of emergency stop no damage occurs substantially with a speedy responsiveness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stair climbing machine, and more particularly to an improvement of a safety device for emergency stop when an abnormality occurs in the speed of the stair climbing machine.

[0002]

2. Description of the Related Art A stair climber usually moves up and down along guide rails installed on stairs.
There are a type of lifting and lowering by winding up a cableway using a wire rope or a chain, a type of manually lifting an installed cableway by itself, and a method of raising and lowering by a rack and pinion method. In the type of climbing using the cableway, it is common to attach an emergency stop device to the stair climber because the cableway may be cut, the hoisting device or the hand-lifting device may idle or slip. . An example of such an emergency stop device is disclosed in
The techniques described in JP-A-36773 and JP-B-59-17025 are known. The abnormal speed of these emergency stop devices is detected by mechanically detecting the rotational speed of the roller sliding on the guide rail or mechanically detecting the rotational speed of the wheel on which the wire rope is hung. Or something. In addition, the stopping method is such that the saw-tooth-shaped protrusion is cut into the guide rail to stop, or the rotation of the wire rope wheel is directly prevented.

[0003]

In the above conventional method,
Since the speed detection is mechanical, it is set to a detection accuracy that does not cause malfunction due to variations in the processing accuracy of the detector, frictional resistance of the bearing, and spring force that determines the operating point. A certain amount of operating time was required from the occurrence to the detection thereof. Therefore, the safety device must be activated after the speed has changed, causing a shock during operation, or in the event that braking damage occurs on members such as guide rails involved in braking at that time, and it may not be possible to use it unless it is replaced. there were. Also, the safety device operation test is difficult to be performed on site because the guide rails and the like are damaged for the above-described reason. Therefore, an object of the present invention is to provide a stair climbing machine capable of reducing the impact at the time of operating the safety device by improving the detection accuracy of the safety device and easily performing an on-site operation test.

[0004]

Means for Solving the Problems To solve the above problems, a stair climber according to the first aspect of the present invention is a stair climber that moves up and down along guide rails installed on stairs, and is incorporated in the stair lift. A rotation speed detection device that detects the rotation speed of the lift motor that has been output and outputs it as an electric signal, and a determination device that determines whether the rotation speed is normal, when the rotation speed exceeds a predetermined value The determination device outputs a stop signal and is configured to perform an emergency stop by the emergency stop device.

According to a second aspect of the present invention, the rotation speed detecting device is an optical sensor or a proximity sensor, and converts the rotation speed of the lifting motor into a pulse signal and outputs the pulse signal.
The determination device counts the number of pulses for a certain period of time,
The counter is configured to output a stop signal when the value exceeds a predetermined value.

A stair climber according to a third aspect of the present invention is configured using a cycle of a commercial power supply as an operation reference of the determination device.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of a stair climber, and FIG. 2 is a side view. In the figure,
Reference numeral 1 denotes a main body of the stair lift, which has a lift motor 3 and a pinion gear 4 inside. Reference numeral 2 denotes a chair on which the user sits and goes up and down, 5 denotes a cord reel containing a power cord and the like, 6 denotes a carriage, 7 denotes a guide rail for guiding the elevating movement of the main body 1, 8 denotes a rack gear, and 9 Is a staircase.

The main body 1 is supplied with power from a code reel 5, and is moved up and down by rotating the elevating motor 3 forward or backward. The lifting motor 3 rotates the pinion gear 4 via a speed reducer, and the main body 1 moves up and down as the pinion gear 4 rotates on a rack gear 8 fixed to the guide rail 7. The carriage 6 is supported by a guide roller or the like so as to be slidable along the guide rail 7. When the angle of the guide rail changes, the angle changes accordingly, and the seat is always kept horizontal. To be rotatable to the main body.

The main body 1 is provided with a rotational speed detecting device for operating an emergency stop device of the safety device and a determining device. FIG. 3 shows a motor assembly part of the main body 1, and a rotation speed detecting device is provided at a rear part (upper part of the drawing) of the lifting motor 3.
Optical sensor 10 for detecting the number of rotations installed in
And a reflector 11 attached to the rear part of the rotating shaft 3a of the elevating motor 3 and reflecting light from the optical sensor 10. The optical sensor 10 has a built-in light source, and the rotation speed of the elevating motor 3 is controlled by the reflecting plate 11. The reflected light is detected and output as a pulse signal. The determination device 13 receives a pulse signal from the optical sensor 10 and determines a rotation state by a counter 16 (FIG. 5).
4), the rotation of the elevating motor 3 is monitored by the optical sensor 10 according to the flowchart shown in FIG. 4, an output is output when the rotation becomes abnormal, and the emergency stop device is operated to stop the stair elevator.

As described above, by using the optical sensor in the rotation speed detecting device, the rotation speed is detected in a non-contact manner, so that there is no possibility of deterioration. Becomes possible. Specifically, the steady-state elevation speed of 15
Detection can be made with an excess of about%.

The operation will be described in order with reference to the flowchart of FIG. 4. First, when a stair lift operation command (S1) is issued, the brake of the lift motor 3 is released (S2) and the operation state (S3) is established. Then, proceeding to S4, during operation, the rotation speed of the lifting motor is constantly compared with the reference value by the optical sensor 10, and
The counter 16 determines whether the rotation is 0 rotation (S5) or over rotation (S6).
Output as 10). In response to the emergency stop command, the motor drive power supply is immediately shut off (S11), the motor brake is activated (S12), the motor stops, and the stair climber is emergency stopped (S13).

If neither zero rotation nor over rotation is detected, the process proceeds from S6 to S7. If the operation is continued, the process returns to S4 to compare the motor speed. If the operation is stopped, the process proceeds to S8 to apply the brake. Then, the stair climber is stopped (S9). The reason why the determination is made by adding 0 rotation in S5 is to determine that the motor does not rotate in spite of the fact that the operation command is issued, which is abnormal, and that the motor is rotating. This is to eliminate the case where the rotation detection device fails and cannot detect the rotation.

The judging device 13 for judging whether the elevating motor 3 has exceeded a prescribed number of revolutions has a configuration as shown in the block diagram of FIG. A pulse signal obtained by half-wave rectification of a 50 Hz or 60 Hz commercial power supply from a rectifier circuit 18 is used as a time axis signal serving as a reference for determining the rotation speed of the lifting motor 3. Is input to The set value is written in the counter 16 in advance, and returns to the set value (preset value) every time a pulse is applied to the preset terminal. Then, a pulse 19 proportional to the number of rotations of the lifting motor 3 is received from the optical sensor 10 and a down-counting operation is performed in accordance with the pulse 19. At this time, if a preset signal is input before the counter 16 counts down to the carry-down, the counter 16 is preset and counts down again from the preset value. If the cycle of the output pulse from the optical sensor 10 is short, the counter 16 counts to 0 before the next preset signal is input, and outputs a carry signal. This carry-down signal is an emergency stop device operation signal, and a braking device (not shown) of the lifting motor 3 which is the emergency stop device 17.
To stop the rotation of the motor.

The rotation speed detecting device may be a proximity sensor 20 utilizing a magnetic field or an electric field. In this case, the optical sensor 10 is used as a proximity sensor 20 and the reflection plate 11 is used as a detection plate 21 for operating the proximity sensor. Good. By doing so, the proximity sensor 20 outputs a change in a magnetic field or an electric field as an electric signal by the action of the detection plate 21, so that a pulsed rotation signal can be obtained similarly to the optical sensor. In addition, since the drive system of the elevator main body 1 is mechanically connected to the guide rail by a rack and pinion, the main body can be stopped by stopping the rotation of the motor when the speed is abnormal. In the case of a driving method using a rope or a chain, the output signal of the counter 16 may be received, and the above-described serrated protrusion may be cut into the guide rail, or the rotation of the wire rope wheel may be directly prevented.

As described above, since the abnormality of the rotation speed is determined by comparing with the reference value, even a slight abnormality can be detected. Further, since the frequency of the commercial power supply is used for the time axis signal, a separate oscillator or the like is required. A highly accurate and highly reproducible safety device can be obtained at low cost. Therefore, even if an operation test is performed on site, the response is quick, and the guide rail and the like are hardly damaged. In this embodiment, the rotation speed of the lifting motor is detected by an optical sensor or a proximity sensor. However, the present invention is not limited to this, and any device capable of converting the rotation speed into an electric signal may be used. In addition, the configuration of each unit may be appropriately changed and embodied without departing from the spirit of the present invention.

[0016]

As described above in detail, according to the first aspect of the present invention, the abnormality of the elevating speed is determined by comparing the rotation speed of the elevating motor with the reference value, so that the detection accuracy is improved, and Since even abnormalities can be detected, there is almost no damage even if an emergency stop operation is performed quickly.

According to the second aspect of the present invention, since the speed is detected in a non-contact manner, there is no fear of deterioration, and since the determination device is a counter, the configuration can be made at low cost.

According to the third aspect of the present invention, since the cycle of the commercial power supply is used as a criterion of the determination circuit, an oscillation circuit or the like is not required, and a high-precision safety device can be configured at low cost.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of a stair climber according to the present invention.

FIG. 2 is a side view of the stair lift of FIG. 1;

FIG. 3 is a front view showing a motor assembly in the main body.

FIG. 4 is a flowchart showing an operation flow of a device for determining the number of revolutions of a lifting motor.

FIG. 5 is a block diagram illustrating an apparatus for determining the number of revolutions.

[Explanation of symbols]

1. Stair lift main body, 3. Lift motor, 10. Optical sensor, 11. Reflector, 12, Rotation speed detector, 1.
3 ··· Judgment device, 15 · · divider, 16 · · counter,
17 ... Emergency stop device, 20 ... Proximity sensor, 21 ...
Detection plate.

Claims (3)

[Claims] 1. A stair lift which moves up and down along guide rails installed on stairs, a rotation speed detecting device which detects a rotation speed of a lift motor built in the stair lift and outputs the rotation speed as an electric signal, and A stair climbing machine having a determination device for determining whether the rotation speed is normal, wherein the determination device issues a stop signal when the number of revolutions exceeds a predetermined value, and is emergency stopped by an emergency stop device. 2. The method according to claim 1, wherein the rotation speed detecting device is an optical sensor or a proximity sensor, and converts the rotation speed of the lifting / lowering motor into a pulse signal and outputs the pulse signal. 2. The stair climbing machine according to claim 1, wherein the stair climbing machine is a counter that outputs a stop signal when a value exceeds a predetermined value. 3. The stair climber according to claim 1, wherein a cycle of a commercial power supply is used as an operation standard of the determination device.