JPH11190451A - Operation range setting device for rotary body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the blocking skill of the valve of a flow rate regulating valve device to prevent the breakage of a valve due to erroneous detection of a limit signal and the operation range setting skill an output shaft (a rotary body) to threaded forward and backward operation of the valve element of especially a flow rate regulating valve. SOLUTION: A rotation position detecting means 4 comprises a permanent magnet 41 arranged at an output gear 33 to perform threaded forward and backward movement of the valve element of a flow rate regulating valve; and a magnetic sensor 42 arranged at a lower casing 6a. In a valve drive device 1 to control rotation operation of a servo motor 21, of which a drive means consists, based on the detecting result thereof, a rotation block pin 52 engaged with the around-groove 51 of an output gear 33 is arranged at a lower casing 6a to prevent overrun of the output gear 33. When the output gear 33 is about to rotate over a given operation range, regulation walls 51a and 51b of the end part of the around-groove 51 are brought into collision with the rotation block pin 52 and rotation of the output gear 33 is forcibly blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for setting an operating range of a rotating body, and more particularly, to a technique for limiting a rotational position of an output shaft in a valve driving apparatus for driving a flow control valve to a predetermined operating range. About.

[0002]

2. Description of the Related Art Conventionally, a flow control valve device used as a tapping flow control valve of a water heater has a structure as shown in FIG.
It comprises a flow control valve a and a valve driving device b for driving the flow control valve a. And this valve driving device b
Is mainly composed of a DC gear motor that operates by receiving a drive signal given from a control unit of a water heater (not shown), and the rotational movement of the DC gear motor serves as a power transmission mechanism inside a valve drive device b (not shown). It is configured to be transmitted to a screw mechanism c that constitutes a valve body of the flow rate control valve a through the above. In other words, the valve driving device b is driven, and the screw mechanism c is advanced and retracted, so that the opening of the valve is adjusted.

[0003] By the way, as described above, the setting of the opening of the valve in such a flow control valve device is performed by the valve driving device b.
Is transmitted to the screw mechanism c of the flow rate control valve a. The operating range of the output shaft d of the power transmission mechanism for rotating the screw mechanism c is from the advancing / retracting position of the screw mechanism c. For example, it is set in advance as a range from 0 ° to 315 °. To set the operation range, a magnet e that rotates together with the output shaft d is provided on the output shaft side so that the rotation of the output shaft d does not exceed the operation range, and a position facing the magnet e is provided. (Specifically, a magnetic sensor f for detecting a magnetic force is fixedly provided in the above-mentioned operation range of 0 ° and 315 °, and rotation of the output shaft is controlled by the magnetic sensor f at positions of 0 ° and 315 °. And sends a limiter signal for instructing the motor to stop rotating.

[0004]

However, in the setting of the operating range of the output shaft by such a magnet and a magnetic sensor, for example, when the control unit for controlling the flow control valve device erroneously detects the limiter signal, There was a risk of damaging the flow control valve device.

That is, the limiter signal received by the control unit from the magnetic sensor f may be erroneously detected (for example, detection error) due to the influence of noise or the like. In such a case, the motor may not be stopped even if the output shaft d exceeds the operation range. In that case, the valve body of the flow rate control valve a is given an unnecessarily advanced operation, so that the valve body may be damaged by being pressed against the frame of the valve, and the frame may be made of plastic or the like. If the valve is structurally weaker than the valve, the valve may push the frame of the valve to cause biting. Moreover, in such a case, even if the motor is reversely rotated to return the valve body to the original position, it may not be possible to return to the original state due to biting.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a flow control valve device capable of preventing the flow control valve from being damaged due to such erroneous detection of a limiter signal. It is an object of the present invention to provide a valve control technology, in particular, an operation range setting technology of an output shaft (rotary body) for screwing a valve body of a flow control valve forward and backward.

[0007]

In order to achieve the above object, an apparatus for setting an operating range of a rotating body according to a first aspect of the present invention includes a magnetic body rotating coaxially with the rotating body, and a drawing of the magnetic body. A magnetic sensor for detecting the magnetism of the magnetic body is provided at a position facing the annular trajectory, and an operation range setting device of the rotating body for stopping rotation of the rotating body by a detection signal of the magnetic sensor; Engagement for mechanically stopping the rotation of the rotating body between the rotating body and a position opposed to the rotating body so that the rotating body does not rotate beyond the operation range set by disposing the magnetic sensor. It is characterized in that a regulating means is provided.

That is, the invention according to claim 1 is
An output shaft that could not be stopped due to an erroneous detection of a limiter signal or the like by providing a locking restricting means for mechanically stopping the rotation of the rotator at both the rotator and a position facing the rotator. The rotation operation of the (rotating body) is forcibly stopped by the locking restricting means. Therefore, according to the present invention, for example, even when the limiter signal is not detected, the output shaft for driving the flow control valve does not operate beyond the set operation range. It is possible to prevent the valve body from being damaged beforehand. For example, by using the present invention for the driving portion of the flow rate control valve of the water heater, it is possible to obtain a stable tapping performance.

According to a second aspect of the present invention, the rotation range of the rotary body is set by the magnetic sensor so that the rotation restricting position of the rotary body by the locking restricting means is provided on the rotary body. It is preferably set at a position where the magnetism of the magnetic material can be detected.

That is, the operating range of the rotating body is 0 °-
In the case where the angle is set to 315 °, for example, as shown in FIG.
As shown in FIG. 4B, each magnetic sensor has a certain width (limiter signal detection range) in a range where magnetism can be detected. On the other hand, since the locking restricting means is used as a secondary restricting means when the limiter signal is not detected by the magnetic sensor, it is preferable that the locking restricting means is actually set slightly beyond this operation range. However, if there is too much room in the arrangement of the locking restricting means, the stop position of the rotating body by the locking restricting means will be out of the range where the magnetism of the magnetic body can be detected by the sensor, and the locking restricting means will prevent the rotation of the rotating body. Even if the operation can be stopped, the magnetic sensor cannot detect the magnetic body at that position. However, in that case, the magnetic sensor cannot detect that the rotating body is stopped beyond the operating range, and as a result, the position of the rotating body cannot be returned to the normal operating range. According to the second aspect of the present invention, in order to avoid such a situation, as shown in FIG. 4B, the locking restricting means is provided so as to stop the rotating body at a position where the magnetic sensor can detect the magnetic field of the magnetic body. With this arrangement, it is possible to return to the normal operation range even when the rotating body rotates beyond the operation range.

Further, according to the present invention, a stepping motor is used as a driving means for driving the rotating body to rotate, and an end point of an operating range of the rotating body is set by the number of steps of the stepping motor.
The magnetic sensor is provided only at the starting point of the operation range,
The locking restricting means is provided at both a start point and an end point of the operation range.

In other words, the invention of claim 3 is the case where a stepping motor is used as the driving means of the rotating body. In this case, the end point of the operating range of the rotating body is easily set by the number of steps of the stepping motor. Therefore, the starting point of the detection of the operating range by the magnetic sensor is important. Therefore, in the invention of claim 3, the magnetic sensor is provided only at the starting point of the operating range, the starting point is detected by this magnetic sensor, and the operation at the end point is stopped by the number of steps of the stepping motor. You.

According to the third aspect of the present invention, the locking restricting means is provided at both the starting point and the ending point of the operating range of the rotating body. That is, the operating range of the rotating body is set to have a constant width (for example, 0 ° to 315 °) as described above. In this case, the rotating body is bidirectional in both forward and reverse directions (clockwise is the forward direction). If the rotation is possible, the rotation (overrun) beyond the setting may occur at both the start point and the end point of the operation range. Therefore, according to the third aspect of the present invention, in such a rotating body that rotates in the forward and reverse directions, the overrun on both the starting point side and the end point side is prevented by providing the locking restricting means at both the starting point and the end point. Has been prevented.

According to a third aspect of the present invention, there is provided an apparatus for setting the operating range of a rotating body, wherein the locking restricting means provided on the end point side of the operating range of the rotating body includes a rotating body. It is preferable that the magnetic sensor on the starting point side is positioned so as not to detect the magnetic body of the rotating rotating body. That is, in the case of the third aspect of the present invention, since the magnetic sensor is not provided on the end point side of the operation range, the position of the locking restricting means on the end point side can be freely set outside the operation range. However, in this case, if the locking restricting means on the end point side is provided so as to be shifted backward, the magnetic body of the rotating body stopped by the locking restricting means may be erroneously detected by the magnetic sensor on the starting point side. Since it can happen, the invention of claim 4 avoids such a situation.
By providing the end-point-side locking restricting means, erroneous detection by the magnetic sensor on the starting point side is prevented.

According to a fifth aspect of the present invention, two magnetic members are concentrically arranged on the rotating member, one of the magnetic members is used for detecting the starting point of the operating range, and the other magnetic member is used for detecting the starting point of the operating range. It is characterized by being used for end point detection. That is, in the invention of claim 5, for example, as shown in FIG. 6, two magnetic bodies are used for one magnetic sensor on the starting point side, and one magnetic body is used for detecting the starting point and the other magnetic sensor is used for the other. By using a magnetic material for end point detection, one magnetic sensor performs position detection similar to that conventionally performed by two magnetic sensors.

That is, when the stepping motor is used as the driving means of the rotating body as described above, the end point of the operating range can be detected by the number of steps of the stepping motor, so that a magnetic sensor for detecting the end point is unnecessary. In the case where the stepping motor does not operate as expected due to, for example, a change in load, one magnetic sensor cannot detect this, so the invention of claim 5 is used for detecting the starting point and the end point of the operating range. The use of a magnetic material has solved such a drawback. According to the fifth aspect of the present invention, since the starting point and the end point of the operating range can be detected, the present invention is not limited to the case where a stepping motor is used as the driving means of the rotating body, and is effective even when a DC motor is used. In addition, the number of magnetic sensors, which was conventionally required two, can be reduced to one, which is more advantageous in cost than conventional products.

The invention according to claim 6 is characterized in that the locking restricting means is configured to be removable.
That is, by configuring the locking restricting means to be detachable, the rotating body is positively circulated and quickly moved to the initial position, for example, rather than preventing the rotating body from rotating beyond the operation range. Even when it is desired to return, the operation range setting device of the rotating body of the present invention can be diverted. Therefore, according to the invention of claim 6, the device of the present invention can be used according to the purpose of use, and a highly versatile device can be provided.

In the above description, the starting point and the ending point of the operating range of the rotating body are relatively determined by the rotating direction of the rotating body. In this case, however, the starting point is particularly based on the initial rotating direction of the rotating body. And an end point.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment in which an apparatus for setting an operating range of a rotating body according to the present invention is used as a valve driving device for a flow control valve (see a valve driving device in FIG. It will be described based on.

As shown in FIGS. 1 to 3, the valve driving device 1 includes a rotary driving means 2 serving as a driving source for screwing a screw mechanism c of a flow rate control valve a forward and backward, and a rotational movement of the rotary driving means 2. A power transmitting means 3 composed of a group of gears for transmitting to the screw mechanism c, and a rotational position detecting means for detecting a rotational position of an output gear (rotary body) 33 arranged at the last stage of the power transmitting means 3 4 and a locking restricting means 5 for mechanically stopping the rotation of the output gear 33. In FIG. 1, reference numeral 6a denotes a lower casing of the valve driving device 1, and as shown in FIG. 3, the external appearance of the valve driving device 1 is constituted by being engaged with an upper casing 6b. Reference numeral 61 denotes an engagement claw that engages these.

A servo motor 21 that can be controlled by an electric signal is preferably used as the rotation driving means 2, and its operation is controlled by a control unit (not shown).
Also, at the tip of the rotating shaft 22 of the servomotor 21,
A gear portion 23 is formed which can mesh with a first gear 31 arranged at the first stage of the power transmission means 3 (see FIG. 3).
The rotation operation of the servomotor 21 is transmitted to the power transmission means 3.

The power transmission means 3 is a group of gears for transmitting the rotation operation of the rotary shaft 22 to the screw mechanism c, and includes a first gear 31 meshing with the gear portion 23 of the rotary shaft 22. A next gear 32 meshing with the first gear 31;
An output gear 33 is formed when meshing with the next gear 32. In the present invention, the output gear 3
The operation 3 is detected by the rotation position detection means 4, and the rotation operation of the servomotor 21 is controlled based on the detection result, so that the output gear 33 operates within a predetermined operation range. .

At the center of the output gear 33,
A boss 33a that can be spline-coupled to the base end of the screw mechanism c is formed upward (see FIG. 3), and at least one or more permanent magnets (magnetic material) 41 are provided below the output gear 33. Are arranged so as to rotate coaxially with the output gear 33. Specifically, this permanent magnet 4
1 is embedded so that a part thereof is exposed from the lower surface of the output gear 33. A circumferential groove 51 is formed on the lower surface of the output gear 33 so as to be further displaced from the permanent magnet 41 in the circumferential direction (in the illustrated example, on the inner side in the circumferential direction). The orbital groove 51 constitutes a part of the locking restricting means 5, and the details thereof will be described later. As shown in FIG. 1 or FIG. 2, at least a part of the groove in the circumferential direction is closed. , Regulating walls 51a and 51b are formed.

The rotational position detecting means 4 is for detecting the rotational position of the output gear 33,
It comprises the permanent magnet 41 and at least one or more magnetic sensors 42. The magnetic sensor 42 is a sensor that detects the magnetism of the permanent magnet 41 that rotates coaxially with the output gear 33 when the output gear 33 rotates. A Hall IC with a Hall element is preferably used. The magnetic sensor 42 is provided on the lower casing 6a so as to face an annular trajectory drawn by the permanent magnet 41 when the output gear 33 rotates (see FIG. 3).

That is, the magnetic sensor 42 detects the rotation (rotational position) of the output gear 33 by a change in magnetism caused by the approach of the permanent magnet 41. Therefore,
By arranging the magnetic sensor 42 at, for example, the start point and the end point of a range in which the output gear 33 is to be rotated (hereinafter, simply referred to as an operation range), An end point is detected. The control unit (not shown) controls the servo motor 21 based on the detection signal (limiter signal) of the magnetic sensor.
By stopping the operation, the output gear 33 is rotated within the operation range. That is, since the operating range of the output gear 33 is determined by the position at which the magnetic sensor 42 is disposed, the magnetic sensor 42 is disposed at the starting point or the end point of the range in which the output gear 33 is actually rotated. The magnetic sensor 42 may be provided only at the starting point of the operating range depending on the drive type of the servomotor 21, and a specific method for arranging them will be described later.

On the other hand, the locking restricting means 5 rotates the output gear 33 so that the output gear 33 does not rotate (overrun) beyond an operation range set by disposing the magnetic sensor 42. This is for mechanically stopping the operation. That is, the locking restricting means 5
It is composed of the above-described orbiting groove 51 and a rotation stopping pin 52 that can be engaged with the orbiting groove 51. Specifically, as shown in FIG. 3, the rotation stopping pin 52 is
1 is a pin-shaped member having a diameter that can be inserted into the inside of the lower casing 6a. When the output gear 33 is mounted on the lower casing 6a, the rotation stop pin 52
Is inserted into the circumferential groove 51.

The rotation stopping pin 52 engaged with the orbiting groove 51 as described above closes the orbiting groove 51 when the output gear 33 attempts to rotate beyond the predetermined operation range. Part (restriction walls 51a, 51
The configuration is such that the rotation of the output gear 33 is forcibly (mechanically) stopped by colliding with b). The rotation stopping pin 52 is connected to the lower casing 6a.
In the case where is formed of plastic, for example, a metal pin-shaped member is press-fitted into a predetermined position of the lower casing 6a and is detachably provided.
That is, by making the rotation stopping pin 52, which is one of the members constituting the locking regulating means 5, detachable, the output gear 33 can be easily rotated, for example, even when it is desired to go around the operating range positively. It is possible to correspond.

Next, specific embodiments of the rotational position detecting means 4 and the locking restricting means 5 will be described together with their functions. In the following embodiment, a case will be described in which the operation range of the output gear 33 is set in a range from 0 ° to 315 °.

Embodiment 1 In the first embodiment of the present invention, as shown in FIG. 4A, a case where one permanent magnet 41 and two magnetic sensors 42 are used as the rotational position detecting means 4 is shown. It is. That is, in FIG. 4A, the operating range of the output gear 33 (from 0 ° to 3 °)
15 °), a magnetic sensor 42a for detecting a starting point;
A magnetic sensor 42b for detecting an end point is provided. When the output gear 33 is positioned at the starting point (initial position), the permanent magnet 41 detects the magnetic sensor 42a for detecting the starting point.
Buried at a position facing the

The locking restricting means 5 includes an output gear 33.
By closing a part of the orbital groove 51 so as not to operate beyond the above operating range (that is, strictly within the range of 316 ° or more and 359 ° or less), the output gear 33 moves beyond the above operating range. Is closed (one of the regulation walls 51a, 51b)
Are configured to collide with the rotation stop pin 52. For example, in the case of FIG.
To rotate to 359 ° side (reverse rotation)
When the rotation stopping pin 52 collides with the regulating wall 51a at one end of the orbital groove 51, further rotating operation is regulated.
If it is attempted to rotate (forward rotation) to the 316 ° side beyond 15 °, the rotation stopping pin 52 is moved to the regulating wall 5 at the other end of the orbital groove 51.
1b so that further rotation is restricted.

However, the mechanical rotation of the output gear 33 by the locking restricting means 5 is used as a secondary restricting means when the position detection by the rotational position detecting means 4 does not operate normally. Therefore, the above configuration is configured such that the output gear 33 can rotate in a range wider than the operation range. In this case, since the magnetic sensor 42 has a certain width (detection range of the limiter signal) in which the magnetism can be detected, as described above, the locking restricting means 5
Is set in consideration of this width.

That is, as shown in FIG. 4 (b), the range in which the rotation is actually permitted by the locking restricting means 5 (hereinafter referred to as the allowable operation range) is the predetermined operation range (0 ° to 0 °). 315 °) plus the width of this limiter signal detection range, and is set not to exceed this range. That is, even if the output gear 33 overruns beyond the above-mentioned operation range and its rotation is finally stopped by the above-mentioned locking restricting means 5, the above-mentioned magnetic sensor 42 is
It is set so that one magnetic field can be detected. Therefore, even when the limiter signal of the magnetic sensor 42 is not transmitted to a control unit (not shown) for some reason, as long as the locking restricting means 5 stops the output gear 33, the magnetic sensor 42 Since the magnetism of the permanent magnet 41 is detected, if the cause of the transmission failure of the limiter signal is eliminated, the control unit immediately detects the state and outputs the output gear 3.
3 can be returned to the operating range.

As described above, in the first embodiment of the present invention, together with the rotational position detecting means 4 for detecting the rotational position of the output gear 33, the locking restricting means 5 for mechanically stopping the rotation of the output gear 33 is provided. Thereby, even if the limiter signal is erroneously detected, overrun exceeding the allowable range can be reliably prevented, and the setting of the locking restricting means 5 is set within the range where the magnetic sensor 42 can detect magnetism. By setting, it is possible to quickly return the output gear 33 to the normal operation range. Further, the magnetic sensor 42 is provided at both the starting point and the ending point of the operating range, and the locking restricting means 5 also prevents overrun of both the starting point and the ending point of the operating range. For example, the present invention can be applied irrespective of the drive type of the servo motor 21.

Embodiment 2 FIG. 5 shows a second embodiment of the present invention. In the second embodiment, a stepping motor is used as the servomotor 21. Here, as shown in FIG. 5A, a permanent magnet 41 and a magnetic sensor constituting the rotational position detecting means 4 are used. 42 are both one. That is, when a stepping motor is used as the servomotor 21, the operation up to the end point can be set by the number of steps of the stepping motor once the starting point of the operation range is determined. Therefore, in the second embodiment, the magnetic sensor 42 used for detecting the starting point (42a) is used.
The end point is detected based on the number of steps.

As shown in FIG. 5B, the allowable operation range of the locking restricting means 5 in this case is such that the starting point side is the starting point (0 °) of the magnetic sensor 42a as in the first embodiment. The setting is made so as not to exceed the range including the width of the limiter signal detection range. Also, on one end point side,
In this embodiment, the magnetic sensor 42 is not provided, but is set so as to allow an overrun equivalent to the case where the magnetic sensor is provided.

That is, in this case, as long as there is no magnetic sensor on the end point side, it is not necessary to match the allowable operation range with the limiter signal detection range. Even if the overrun is suppressed, the magnetic sensor 42a on the starting point side may erroneously detect this, so that it is necessary to set the allowable range on the end point side to a range that does not cause such erroneous detection. . Therefore, as long as the erroneous detection does not occur, the specific position setting of the allowable range on the end point side can be appropriately changed. In this embodiment, in particular, the reason why the allowable range on the end point side is set to be substantially the same as the limiter signal detection range on the start point side is that the output gear 33 as a device component is
General-purpose parts for devices that operate in the same operating range (for example, 0 ° to 315 °) regardless of the presence or absence of the magnetic sensor on the end point side (high mass productivity due to the same shape of the circumferential groove 51)
It is because it is used as.

As described above, according to the second embodiment, even when the stepping motor is used as the servomotor and the number of the magnetic sensors 24 is one on the starting side, the overrun of the output gear 33 is prevented by the locking restricting means. 5, the operation range can be reliably set without considering overrun due to a step number count error, for example. In addition, in this case, since there is only one magnetic sensor 24, the manufacturing cost of the rotational position detecting means 4 can be suppressed to be lower than that of a conventional product. Also, on the starting side, the return to the normal operating range after overrun can be expected
This is the same as the first embodiment.

Embodiment 3 FIG. 6 shows a third embodiment of the present invention. In the third embodiment, as shown in FIG. 6, one magnetic sensor 42 constituting the rotational position detecting means 4 is provided and two permanent magnets 41 are provided. That is, in the third embodiment, a permanent magnet 41a for detecting a starting point and a permanent magnet 41b for detecting an end point are used as the permanent magnets 41.
These permanent magnets 41a and 41b are connected to the output gear 33.
Are arranged concentrically.

In the method of detecting the end point by the number of steps of the stepping motor by using both the permanent magnet 41 and the magnetic sensor 42 as in the second embodiment as described in the second embodiment, for example, the end point is determined by the fluctuation of the load of the output gear 33. It is disadvantageous in terms of cost that accurate detection of the operating range cannot be performed when the rotation cannot be obtained in the same way and that the magnetic sensor 42b is used for the end point detection as in the first embodiment. It is in view of things.

Specifically, in the third embodiment, the permanent magnet 41a for detecting the starting point is located at a position facing the magnetic sensor 42 when the output gear 33 is set to the initial position, as in the first and second embodiments. It is arranged in. The one end point detecting permanent magnet 41b is advanced by a predetermined angle in the forward direction from the starting point detecting permanent magnet 41a so as to face the magnetic sensor 42 when the output gear 33 rotates by a predetermined operating range. It is provided in the position where it was. That is, the permanent magnet 41b for detecting the end point has an operation range of 0 ° to 315 °.
When the angle is set to °, as shown in FIG. 6, it is provided at a position advanced by 15 ° in the positive direction from the permanent magnet 41a for detecting the starting point.

Therefore, when the output gear 33 rotates in the forward direction from the starting point toward the end point by the above-described operating range, the magnetic sensor 42 detects the magnetism of the permanent magnet 41b on the end point side. Therefore, in this case, the magnetic sensor 4
2 are permanent magnets 41a, 4 both at the start and end points of the operating range.
1b to transmit a limiter signal by detecting the respective magnetisms. The control unit (not shown) is configured to control the driving of the servomotor 21 by receiving the limiter signals of the start point and the end point. That is, in the control unit, if the rotation direction of the output gear 33 is grasped, for example, if the limiter signal is detected in the forward rotation, the output gear 3
3 can be determined to have reached the end point position, and conversely, if the limiter signal is detected in reverse rotation, it can be determined that it has returned to the start point position, so that the rotation control of the servomotor 21 is performed according to the result. It can be carried out. Therefore, the third embodiment can be applied to a stepping motor or a DC motor regardless of the drive type of the servomotor 21.

When a stepping motor is used as the servomotor 21, the detection range of the starting point and the ending point is compared with the number of steps operated between them, so that step-out or malfunction of the motor can be detected by one magnetic sensor. 42, and the number of magnetic sensors 42 is one, which is advantageous in terms of manufacturing cost.

Further, the locking restricting means 5 in the third embodiment is set so that the allowable operating range is slightly wider than the operating range of the output gear 33, as in the first and second embodiments. However, if the rotation of the output gear 33 is permitted as described above, the locking restricting means 5 can be removed to positively rotate the output gear 33. In that case, for example, the output gear 33
In the positive direction, the number of operation steps from when the magnetic sensor 42 detects the passage of the permanent magnet 41b for detecting the end point to when the passage of the permanent magnet 41a for detecting the starting point is detected again is reduced. By performing the detection, it is also possible to detect the rotation of a portion outside the operation range, which has not been detected conventionally.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately designed and changed within the scope of the present invention. That is, in the above embodiment, the case where the operating range setting device for the rotating body according to the present invention is applied to the valve driving device of the flow control valve has been described, but the application of the present invention is not limited to this. Further, it is needless to say that the operation range of the rotating body (output gear 33) set in the present invention can be freely set as appropriate. In the above embodiment, the gear (the output gear 3) is used.
Although used for the rotation position control of 3), the present invention can be applied to other rotating bodies other than the gears. Further, in the above-described embodiment, a configuration in which the output gear 33 is mechanically stopped by the collision between the orbiting groove 51 and the rotation stopping pin 52 is employed as the locking restricting means 5, but these both mechanically stop both. If so, other configurations can be adopted.

[0045]

As described in detail above, according to the present invention,
By providing a mechanism (locking restricting means) for forcibly stopping the rotation of the rotating body at both the rotating body and the position facing the rotating body, the detection signal (limiter signal) of the magnetic sensor can be changed to noise or the like. Thus, even if the signal cannot be received due to the influence of the above, overrun of the rotating body can be reliably prevented. Therefore, by using the present invention for the operation control of the output shaft (rotary body) in the valve drive device of the flow rate control valve, it is possible to reliably avoid the breakage due to the excessive operation of the valve element performing the reciprocating operation by this valve drive device. Can be. In addition, since this locking restricting means can be easily realized with a mechanical configuration without specially requiring electric components and the like, it can be manufactured at a low cost without significantly increasing the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of an embodiment of an operating range setting device for a rotating body according to the present invention.

FIG. 2 is a plan view illustrating a positional relationship and the like of a power transmission unit in the operation range setting device of FIG.

3 is an explanatory cross-sectional view showing a part of the operation range setting device shown in FIG. 2 in a cross section.

FIG. 4 is a view for explaining a positional relationship between a rotation position detecting means and a locking restricting means in the first embodiment of the rotating body operation range setting device according to the present invention, and FIG. FIG. 4 (b) is a schematic diagram showing
FIG. 2 is an explanatory diagram showing an expanded view of FIG.

FIG. 5 is a diagram for explaining a positional relationship between a rotation position detecting means and a locking restricting means in a second embodiment of the rotating body operation range setting device according to the present invention, and FIG. FIG. 5 (b) is a schematic diagram showing
FIG. 2 is an explanatory diagram showing an expanded view of FIG.

FIG. 6 is a diagram for explaining a positional relationship between a rotational position detecting unit and a locking restricting unit in a third embodiment of the rotating body operation range setting device according to the present invention, and shows the relationship in a plan view. It is a schematic diagram.

7 (a) shows a schematic configuration diagram of a conventional flow control valve and its valve driving device, and FIG. 7 (b) shows a rotational position detection for setting a rotational operation range of the valve driving device. FIG. 3 shows a schematic diagram of the configuration of the means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve drive device 2 Rotation drive means 21 Servo motor 3 Power transmission means 33 Output gear (rotary body) 4 Rotational position detection means 41 Permanent magnet (magnetic substance) 42 Magnetic sensor 5 Locking regulation means 51 Circular groove 51a, 51b Regulation wall 52 Rotation stop pin a Flow control valve b Valve drive c Screw mechanism (valve element)

Claims (6)

[Claims] 1. A magnetic body that rotates coaxially with a rotating body, and a magnetic sensor that detects the magnetism of the magnetic body is provided at a position facing an annular locus drawn by the magnetic body, and a detection signal from the magnetic sensor is used. An operating range setting device for a rotating body for stopping rotation of the rotating body, wherein the rotating body and the rotation are arranged so that the rotating body does not rotate beyond an operating range set by disposing the magnetic sensor. An operating range setting device for a rotating body, further comprising a locking restricting means for mechanically stopping the rotation of the rotating body at a position facing the body. 2. The method according to claim 1, wherein the rotation restricting position of the rotating body by the locking restricting means is set at a position where the magnetic sensor can detect magnetism of a magnetic body provided on the rotating body. The operating range setting device for a rotating body according to claim 1. 3. A method in which a stepping motor is used as driving means for rotatingly driving the rotating body, and an end point of an operating range of the rotating body is set by the number of steps of the stepping motor. The operating range setting device for a rotating body according to claim 1, wherein the locking restricting means is provided only at a starting point and an ending point of the operating range. 4. An apparatus according to claim 3, wherein said locking means provided on the end point side of the operating range of said rotating body includes a magnetic sensor on said starting point side when said rotating body rotates. Are positioned so as not to detect the magnetic body of the rotating body that has rotated. 5. The magnetic sensor is provided only on the starting point side of the operating range of the rotating body, and two magnetic sensors are concentrically arranged on the rotating body, and one magnetic body is used for detecting the starting point of the operating range. 3. The operating range setting device for a rotating body according to claim 1, wherein the other magnetic body is used for detecting an end point of the operating range. 6. The operating range setting device for a rotating body according to claim 1, wherein the locking restricting means is configured to be detachable.