JP3664269B2 - Position detection device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention can detect that a moving body that is driven by a motor and reciprocates within a specified range has been moved to a specified range limit point, and further, runs away (overrun) beyond the specified range limit point. It is related with the position detection apparatus which enabled it to detect this.
[0002]
[Prior art]
In the device that moves the moving body with the driving force of the motor, when the moving body reaches the specified range limit point, this is detected and the driving of the motor is stopped, or between the motor and the moving body. If a method for interrupting power transmission is not employed, an overload is applied to the motor, causing abnormal heating and burning, or damage to other drive systems, causing trouble.
[0003]
Therefore, in this type of device, when the moving body reaches the specified range limit point, a method of detecting this and stopping the driving of the motor or cutting off the power transmission between the motor and the moving body is used. ing. However, a problem with this method is that the moving object has been moved beyond the specified range limit point, that is, when it has runaway. In this case, the moving object after overrun can be detected. Can not.
Therefore, conventionally, as a means for detecting the overrun of the moving body, in addition to a sensor for detecting that the specified range limit point has been reached on both ends of the moving body, an overrun detection is provided. Some have a structure in which a sensor is separately provided. In this structure, a sensor for detecting a predetermined range and a sensor for detecting overrun are required at the moving end on each side, and when both sides are combined, four sensors are used.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional apparatus, in which the means for detecting the specified range limit point and the overrun is provided at the moving end on each side of the moving body, four sensors are required, and the number of sensors is large. In addition, the wiring is complicated and the equipment cost is high. Therefore, there is a demand for a simple structure that can detect the specified range limit point and overrun of the moving body.
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a position detection device capable of detecting a specified range limit point and an overrun of a moving body with a small number of sensors. is there. Further, other objects will be made clear in the contents described below.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a position that includes a moving body that is driven by a motor and can reciprocate within a specified range, and a pair of sensors provided at fixed positions near the moving range of the moving body. In the detection device, the pair of sensors are respectively arranged at substantially equal positions outside the moving body, and are provided on one side of the moving body in correspondence with the one sensor, and one specified range limit of the moving body A first specified range limit point detection unit for detecting a point, and a first detection unit that is provided on one side of the moving body in correspondence with the other sensor and detects one overrun of the moving body. A second prescription for detecting the other specified range limit point of the movable body , which is disposed on one side of the movable body in correspondence with the other sensor. range A field point detecting unit, the to correspond to one of the sensors disposed on one side of the movable body, and a second over-run detection unit for detecting the other of overrun of the movable body by a predetermined distance displacement When the movable body reaches the one specified range limit point and moves further beyond the one specified range limit point from the state where the first specified range detection unit is detected by the one sensor. In addition, an overrun is detected by the other sensor corresponding to the first overrun detection unit, the moving body reaches the other specified range limit point, and the second specified range detection unit is from the state detected by the other sensor, when further moving beyond said other specified range limit point, detect overrun by the one sensor corresponding to said second overrun detector It is characterized in that it has to so that.
[0007]
Moreover, it is preferable that the above moving body is moved by rotation of a screw rotated by the motor (claim 2).
[0008]
[Action]
According to this, it is possible to detect the limit point and the overrun state on both sides of the specified range in which the moving body is allowed to move with the pair of sensors. Therefore, in the case of the conventional device, only half of the sensors are required, and the sensor cost can be reduced, the wiring can be simplified, the man-hours can be reduced, and the equipment configuration can be reduced. It becomes simple and easy to maintain.
[0009]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 4 show an elevator mechanism as an embodiment of the position detection apparatus of the present invention. 1 to 4, a shaft 1 having a threaded outer periphery is rotated by a driving force of a motor 2 (see FIG. 1) that is rotationally driven in two forward and reverse directions. The shaft 1 is attached with a moving body 3 that is screwed in a direction corresponding to the rotation direction of the shaft 1, that is, in the vertical direction. In this embodiment, when the shaft 1 is rotated in the positive direction (clockwise direction), the moving body 3 is moved upward, and when the shaft 1 is rotated in the negative direction (counterclockwise direction), the moving body 3 is moved downward. It is structured to be moved to.
[0010]
Further, on one side surface of the moving body 3, the upper end detection plate 4a as the first specified range detection unit and the detection plate 5b as the lower overrun detection unit are separated from each other in the vertical direction. It protrudes at a substantially right angle toward the outside and is fixedly attached. Here, the distance between the upper end detection plate 4a and the lower end detection plate 5b is set to L1.
Further, on the other side surface of the movable body 3, a lower end detection plate 4b as a second specified range detection unit and a detection plate 5a as an upper overrun detection unit are also divided in the vertical direction. It is fixedly attached in a state of protruding at a substantially right angle from the side to the outside. Here, the lower end detecting plate 4b and the distance between the detection plate 5a has been set equal to the distance L1 between the upper end detection plate 4a and the detection plate 5b, the upper end detection plate 4a and the detection plate 5b under edge detection The plate 4b and the detection plate 5a are displaced upwardly by a distance L2.
[0011]
In addition, sensors 6 a and 6 b are arranged on the outer side of the moving body 3 so as to correspond to the respective side surfaces. The sensors 6a and 6b are arranged at the same position in the up-down direction in which the moving body 3 is moved and are fixed to the apparatus main body (not shown) in a state of facing each other. These sensors 6a and 6b have the same structure, and any one of the detection plates 4a, 4b, 5a and 5b is interposed between the pair of detection pieces 7 and 7 as shown in FIG. When arranged, the output of the arranged sensors 6a, 6b is switched from on to off, and when the detection plate (4a, 4b, 5a, 5b) is removed from between the pair of detection pieces 7, 7, The output of the detached sensors 6a and 6b can be switched from off to on. Then, by obtaining signals from the sensors 6a and 6b, it is possible to detect when the moving body 3 reaches the specified range limit point and when the vehicle 3 runs out of control (overrun). FIG. 1 to FIG. 4 show the state at that time, and FIG. 5 shows the signal mode obtained from the sensors 6a and 6b in accordance with the position of the moving body 3. FIG.
[0012]
The position detection operation will be described next with reference to FIGS.
(1) First, in a state in which the moving body 3 is arranged and moving within a defined area, no detection plate is arranged on the sensors 6a and 6b, and therefore the outputs of the sensors 6a and 6b. Is outputting ON.
(2) Here, when the motor 2 is rotated in the forward direction, the movable body 3 gradually moved upward by the shaft 1. As shown in FIG. 1, when the moving body 3 reaches the position of the upper limit specified range limit point US, the detection plate 4a is arranged in the sensor 6b, the output of the sensor 6b is turned off, and the output of the sensor 6a is turned on. . Thereby, it can be known that the moving body 3 has reached the position of the upper limit specified range limit point US. And normally, when this position is reached, the power supply to the motor 2 is cut off.
(3) However, when the moving body 3 reaches the upper limit specified range limit point US, the motor 2 cannot be controlled with good timing, and the moving body 3 has the upper limit specified range limit point US as shown in FIG. If the detection plate 4a is disposed in the sensor 6b and the detection plate 5a is further disposed in the sensor 6a, the sensor 6a And the output of the sensor 6b are both turned off. As a result, it is understood that the moving body 3 has overrun upward, and an emergency stop or the like is taken.
(4) Next, when the motor 2 is rotated in the negative direction in a state where the moving body 3 is disposed within the defined region, the moving body 3 is moved downward by the shaft 1. As shown in FIG. 3, when the moving body 3 reaches the position of the lower limit specified range limit point DS, the detection plate 4b is disposed in the sensor 6a, the output of the sensor 6a is turned off, and the output of the sensor 6b is turned on. . Thereby, it can be known that the moving body 3 has reached the position of the lower limit specified range limit point DS. And normally, when this position is reached, the power supply to the motor 2 is cut off.
(5) However, when the moving body 3 reaches the lower limit specified range limit point DS, the motor 2 cannot be controlled with good timing, and the moving body 3 has the lower limit specified range limit point DS as shown in FIG. If the detection plate 4b is disposed in the sensor 6a and the detection plate 5b is further disposed in the sensor 6b, the sensor 6a is further moved. And the output of the sensor 6b are both turned off. As a result, it is understood that the moving body 3 has overrun downward, and an emergency stop or the like is taken.
[0013]
Therefore, in the structure of the present embodiment, the upper limit specified range limit point US allowing the movement of the moving body 3 by the pair of sensors 6a and 6b, its upper end side overrun state, and the lower limit specified range limit point DS and its A lower end overrun state can be detected. As a result, in the case of the conventional apparatus, four sensors are used, but two half of the sensors 6a and 6b can be used, so that the sensor cost can be reduced and the wiring can be simplified and the man-hours can be reduced. Furthermore, the configuration of the equipment is simplified and maintenance is facilitated.
[0014]
In the above embodiment, the structure in which the sensors 6a and 6b are controlled by the detection plates 4a, 4b, 5a and 5b disposed in the sensors 6a and 6b is disclosed. As shown in FIG. 7, it is possible to adopt a structure in which a pair of proximity sensors 11 a and 11 b and elongated block pieces 12 a and 12 b that are divided into left and right side portions of the moving body 3 are respectively extended in the vertical direction. Here, the length in the vertical direction of each block piece 12a, 12b is the dimension L1, and the block pieces 12a, 12b are displaced from each other by a distance L2 in the vertical direction.
[0015]
【The invention's effect】
As described above, according to the present invention, the pair of sensors can detect the limit point and the overrun state on both sides of the specified range in which the moving body is allowed to move. In contrast to using four sensors, only half of the sensors are required. As a result, sensor costs can be reduced, wiring can be simplified, man-hours can be reduced, and effects such as simplified equipment configuration and easy maintenance can be expected.
[Brief description of the drawings]
FIG. 1 is a main part configuration diagram of an elevator mechanism shown as an embodiment of the present invention.
FIG. 2 is a main part configuration diagram of an elevator mechanism shown as an embodiment of the present invention.
FIG. 3 is a main part configuration diagram of an elevator mechanism shown as an embodiment of the present invention.
FIG. 4 is a main part configuration diagram of an elevator mechanism shown as an embodiment of the present invention.
FIG. 5 is a diagram illustrating a relationship between a position of a moving body and each sensor output.
FIG. 6 is a perspective view of a main part configuration of an elevator mechanism shown as an embodiment of the present invention.
FIG. 7 is a main part configuration diagram showing a modification of the present invention.
[Explanation of symbols]
1 Shaft 2 Motor 3 Moving body 4a Detection plate (specified range limit point detector)
4b Detection plate (specified range limit point detector)
5a Detection plate (overrun detection part)
5b Detection plate (overrun detection part)
6a Sensor 6b Sensor US Upper limit specified range limit point (one specified range limit point)
DS Lower limit range limit point (the other specified range limit point)

Claims (2)

In a position detection device comprising a moving body driven by a motor and capable of reciprocating within a specified range, and a pair of sensors provided at a fixed position near the moving range of the moving body,
As well as arranged the pair of sensors at substantially equal position outside of the moving body,
A first specified range limit point detector for detecting one specified range limit point of the moving body , which is provided on one side of the moving body corresponding to the one sensor, and corresponding to the other sensor. Provided on one side of the movable body, and a first overrun detection unit for detecting one overrun of the movable body is displaced by a predetermined distance,
A second specified range limit point detector for detecting the other specified range limit point of the moving body provided on one side of the moving body in correspondence with the other sensor; and corresponding to the one sensor. Provided on one side of the movable body, and a second overrun detection unit for detecting the other overrun of the movable body is arranged with a predetermined distance displacement,
When the moving body reaches the one specified range limit point and further moves beyond the one specified range limit point from the state in which the first specified range detection unit is detected by the one sensor , An overrun is detected by the other sensor corresponding to the first overrun detector;
When the movable body further moves beyond the other specified range limit point from the state where the other specified range limit point is reached and the second specified range detection unit is detected by the other sensor. An overrun is detected by the one sensor corresponding to the second overrun detection unit.   The position detection device according to claim 1, wherein the moving body is moved by rotation of a screw rotated by the motor.

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