JPH0313462Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a displacement detection device that detects displacement of a conveyance vehicle moving along a conveyance path from a stop position in a positioning and stopping device.

"Conventional technology" Conveying equipment that transports goods within a factory is
In order to load/unload or process objects to be transported, there are cases where it is necessary to accurately position and stop the transport vehicle at a station provided on the transport path.

FIG. 3 is a longitudinal cross-sectional view showing a conventional configuration example of a positioning and stopping device that applies braking force to a conveyance vehicle to stop it in a non-contact manner. In this figure, a secondary iron core 2 is fixed to the lower surface of a carrier 1. on the other hand,
A primary iron core 4 is disposed on the conveyance path 3 side, facing the secondary iron core 2. Then, when the transport vehicle 1 reaches the stop position, the primary iron core 4
By energizing the coil 5 wound around 1
By causing the secondary iron core 4 to attract the secondary iron core 2, the transport vehicle 1 can be stopped at a predetermined position.

"Problems to be solved by the invention" By the way, when the above-mentioned non-contact stopping device is incorporated into a magnetic levitation type or air levitation type transport device, mechanical friction between the transport vehicle 1 and the transport path 3 is generated. Since no force is applied, the transport vehicle 1 vibrates greatly in the transport direction at the stop position, and it takes a long time to stop. Therefore, in order to attenuate the vibration and stop it in a short time, it is necessary to detect the displacement, speed, and acceleration of the vibration of the transport vehicle 1, and to control the voltage applied to the coil 5 using this detection signal as a feedback signal. be. However, there is generally a problem in that it is difficult to detect the displacement, speed, etc. of the vibration in the transport direction described above without contact. It is also conceivable to directly measure the displacement of the transport vehicle 1 using an optical displacement meter, a laser displacement meter, etc., but this has not yet been put to practical use due to cost considerations.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a displacement detection device for a positioning and stopping device that can detect vibrational displacement of a transport vehicle at a stop position in a non-contact manner with a simple and inexpensive configuration. With the goal.

"Means for Solving the Problems" The present invention provides: (a) a displacement detection device for detecting displacement of a conveyance vehicle moving along a conveyance path from a stop position in a positioning and stopping device; (c) a member to be detected that is attached to a trolley and has an inclined surface having a certain angle with respect to the transport direction of the transporter; and detection means for detecting.

"Operation" According to the present invention, by providing a detected member having an inclined surface and a detection means disposed opposite to the inclined surface, displacement of the transport vehicle from the stop position in the transport direction can be detected. It is detected as a change in the direction perpendicular to .

"Embodiment" An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are a perspective view and a front view, respectively, showing the configuration of this embodiment. In these figures,
Reference numeral 11 denotes a transport vehicle that is movable along a transport path (not shown) in the direction of the arrow. Note that these figures show a state in which the transport vehicle 11 is stopped at a stop position 12. At this stop position 12, a primary iron core 14 of an electromagnet 13 for positioning and stopping is arranged.
The primary iron core 14 has a substantially U-shaped cross section, with its opening facing upward, and a coil 15 wound around its lower part. A terminal of this coil 15 is connected to a control device 16, and a power source 17 is also connected to the control device 16. On the other hand, the transport vehicle 11
A plate-shaped secondary iron core 18 is attached and fixed to the widthwise end of the lower surface of the carriage 11, and a taper 19a is formed near the corner of the lower surface of the transport vehicle 11 made of a conductive material such as copper. Wedge-shaped member to be detected 19
is installed and fixed. An eddy current sensor 20 is disposed directly below the detected member 19, facing it with a slight gap δ therebetween. This eddy current sensor 20 is a sensor that measures the distance to the taper 19a, and its output is supplied to the control device 16.

In such a configuration, when the transport vehicle 11 that has traveled on the transport path reaches the vicinity of the stop position 12,
The coil 15 is energized by a control signal issued from the control device 16. As a result, the primary iron core 14 attracts the secondary iron core 18, thereby applying braking to the conveyor truck 11, and the truck 11 vibrates in the direction of the arrow (reference symbol A in FIG. 2) near the stop position 12. . If the displacement of the vibration at this time is X, then the gap δ will be a value proportional to the displacement X. That is, if the length of the detected member 19 in the horizontal direction is l, and the height of the taper 19a in the vertical direction is h, then δ is (h/l)X, in other words, the displacement X is proportional to the gap δ. Therefore, the output of the eddy current sensor 20 shows a value proportional to the displacement X.

The gap δ detected by the eddy current sensor 20 is then supplied as a feedback signal to the control device 16, and the excitation voltage of the coil 15 is controlled based on this feedback signal. That is, a low excitation voltage is applied to the coil 15 when the conveyance vehicle 11 moves toward the stop position 12, and a high excitation voltage is applied when it leaves the stop position 12. As a result, a vibration damping force is applied to the carrier 11, and the carrier 11 stops in a short time.

In the above embodiment, the detection member 19 is attached to the corner of the lower surface of the transport vehicle 11, but the present invention is not limited to this. It may be provided at the location or on the longitudinal side. Further, the member to be detected 19 is not limited to copper, and may be made of a conductive material other than copper. Further, the detection means is not limited to the eddy current sensor 20, and other gap sensors such as a capacitance sensor may be used.

"Effects of the Invention" As explained above, according to the present invention, there is provided a member to be detected that is attached to a transport vehicle and has an inclined surface having a predetermined angle with respect to the transport direction of the transport vehicle; Since the configuration includes a detection means that is placed opposite to the slope of the vehicle and detects the distance to the slope, it is possible to easily detect minute vibrations of a few millimeters or less in the vicinity of the stop position without contact. And it can be detected with an inexpensive configuration. Further, even when the vibration displacement is several tens of mm, the same sensor can be used by appropriately reducing the taper inclination h/l, expanding the range of sensor applications.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a front view, respectively, showing the structure of an embodiment of the present invention, and FIG. 3 is a longitudinal sectional view showing the conventional structure. 11... Transport vehicle, 12... Stop position, 13...
...Electromagnet, 14...Primary iron core, 15...Coil, 16...Control device, 17...Power supply, 18...
Secondary iron core, 19... Member to be detected, 19a... Taper, 20... Eddy current sensor, X... Displacement, δ
...Gap.

Claims (1)

[Claims for Utility Model Registration] (a) A displacement detection device for detecting displacement of a conveyance vehicle moving along a conveyance path from a stop position in a positioning stop device, (b) a displacement detection device that is attached to the conveyance vehicle and that (c) a detecting member arranged to face the inclined surface of the detecting member and detecting a distance to the inclined surface; A displacement detection device in a positioning and stopping device, comprising: